refactor: remove node.* and util.* and move 3rdparty libs into separate directory

4 files changed, 3081 insertions, 0 deletions

diff --git a/3rdparty/ezxml/CMakeLists.txt b/3rdparty/ezxml/CMakeLists.txt
new file mode 100644
index 0000000..db024d9
--- /dev/null
+++ b/3rdparty/ezxml/CMakeLists.txt
@@ -0,0 +1,4 @@
+cmake_minimum_required(VERSION 3.2)
+project(ezxml)
+
+add_library(ezxml STATIC ezxml.c)
diff --git a/3rdparty/ezxml/ezxml.c b/3rdparty/ezxml/ezxml.c
new file mode 100644
index 0000000..82b11fb
--- /dev/null
+++ b/3rdparty/ezxml/ezxml.c
@@ -0,0 +1,1015 @@
+/* ezxml.c
+ *
+ * Copyright 2004-2006 Aaron Voisine <aaron@voisine.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <sys/types.h>
+#ifndef EZXML_NOMMAP
+#include <sys/mman.h>
+#endif // EZXML_NOMMAP
+#include <sys/stat.h>
+#include "ezxml.h"
+
+#define EZXML_WS   "\t\r\n "  // whitespace
+#define EZXML_ERRL 128        // maximum error string length
+
+typedef struct ezxml_root *ezxml_root_t;
+struct ezxml_root {       // additional data for the root tag
+    struct ezxml xml;     // is a super-struct built on top of ezxml struct
+    ezxml_t cur;          // current xml tree insertion point
+    char *m;              // original xml string
+    size_t len;           // length of allocated memory for mmap, -1 for malloc
+    char *u;              // UTF-8 conversion of string if original was UTF-16
+    char *s;              // start of work area
+    char *e;              // end of work area
+    char **ent;           // general entities (ampersand sequences)
+    char ***attr;         // default attributes
+    char ***pi;           // processing instructions
+    short standalone;     // non-zero if <?xml standalone="yes"?>
+    char err[EZXML_ERRL]; // error string
+};
+
+char *EZXML_NIL[] = { NULL }; // empty, null terminated array of strings
+
+// returns the first child tag with the given name or NULL if not found
+ezxml_t ezxml_child(ezxml_t xml, const char *name)
+{
+    xml = (xml) ? xml->child : NULL;
+    while (xml && strcmp(name, xml->name)) xml = xml->sibling;
+    return xml;
+}
+
+// returns the Nth tag with the same name in the same subsection or NULL if not
+// found
+ezxml_t ezxml_idx(ezxml_t xml, int idx)
+{
+    for (; xml && idx; idx--) xml = xml->next;
+    return xml;
+}
+
+// returns the value of the requested tag attribute or NULL if not found
+const char *ezxml_attr(ezxml_t xml, const char *attr)
+{
+    int i = 0, j = 1;
+    ezxml_root_t root = (ezxml_root_t)xml;
+
+    if (! xml || ! xml->attr) return NULL;
+    while (xml->attr[i] && strcmp(attr, xml->attr[i])) i += 2;
+    if (xml->attr[i]) return xml->attr[i + 1]; // found attribute
+
+    while (root->xml.parent) root = (ezxml_root_t)root->xml.parent; // root tag
+    for (i = 0; root->attr[i] && strcmp(xml->name, root->attr[i][0]); i++);
+    if (! root->attr[i]) return NULL; // no matching default attributes
+    while (root->attr[i][j] && strcmp(attr, root->attr[i][j])) j += 3;
+    return (root->attr[i][j]) ? root->attr[i][j + 1] : NULL; // found default
+}
+
+// same as ezxml_get but takes an already initialized va_list
+ezxml_t ezxml_vget(ezxml_t xml, va_list ap)
+{
+    char *name = va_arg(ap, char *);
+    int idx = -1;
+
+    if (name && *name) {
+        idx = va_arg(ap, int);    
+        xml = ezxml_child(xml, name);
+    }
+    return (idx < 0) ? xml : ezxml_vget(ezxml_idx(xml, idx), ap);
+}
+
+// Traverses the xml tree to retrieve a specific subtag. Takes a variable
+// length list of tag names and indexes. The argument list must be terminated
+// by either an index of -1 or an empty string tag name. Example: 
+// title = ezxml_get(library, "shelf", 0, "book", 2, "title", -1);
+// This retrieves the title of the 3rd book on the 1st shelf of library.
+// Returns NULL if not found.
+ezxml_t ezxml_get(ezxml_t xml, ...)
+{
+    va_list ap;
+    ezxml_t r;
+
+    va_start(ap, xml);
+    r = ezxml_vget(xml, ap);
+    va_end(ap);
+    return r;
+}
+
+// returns a null terminated array of processing instructions for the given
+// target
+const char **ezxml_pi(ezxml_t xml, const char *target)
+{
+    ezxml_root_t root = (ezxml_root_t)xml;
+    int i = 0;
+
+    if (! root) return (const char **)EZXML_NIL;
+    while (root->xml.parent) root = (ezxml_root_t)root->xml.parent; // root tag
+    while (root->pi[i] && strcmp(target, root->pi[i][0])) i++; // find target
+    return (const char **)((root->pi[i]) ? root->pi[i] + 1 : EZXML_NIL);
+}
+
+// set an error string and return root
+ezxml_t ezxml_err(ezxml_root_t root, char *s, const char *err, ...)
+{
+    va_list ap;
+    int line = 1;
+    char *t, fmt[EZXML_ERRL];
+    
+    for (t = root->s; t < s; t++) if (*t == '\n') line++;
+    snprintf(fmt, EZXML_ERRL, "[error near line %d]: %s", line, err);
+
+    va_start(ap, err);
+    vsnprintf(root->err, EZXML_ERRL, fmt, ap);
+    va_end(ap);
+
+    return &root->xml;
+}
+
+// Recursively decodes entity and character references and normalizes new lines
+// ent is a null terminated array of alternating entity names and values. set t
+// to '&' for general entity decoding, '%' for parameter entity decoding, 'c'
+// for cdata sections, ' ' for attribute normalization, or '*' for non-cdata
+// attribute normalization. Returns s, or if the decoded string is longer than
+// s, returns a malloced string that must be freed.
+char *ezxml_decode(char *s, char **ent, char t)
+{
+    char *e, *r = s, *m = s;
+    long b, c, d, l;
+
+    for (; *s; s++) { // normalize line endings
+        while (*s == '\r') {
+            *(s++) = '\n';
+            if (*s == '\n') memmove(s, (s + 1), strlen(s));
+        }
+    }
+    
+    for (s = r; ; ) {
+        while (*s && *s != '&' && (*s != '%' || t != '%') && !isspace(*s)) s++;
+
+        if (! *s) break;
+        else if (t != 'c' && ! strncmp(s, "&#", 2)) { // character reference
+            if (s[2] == 'x') c = strtol(s + 3, &e, 16); // base 16
+            else c = strtol(s + 2, &e, 10); // base 10
+            if (! c || *e != ';') { s++; continue; } // not a character ref
+
+            if (c < 0x80) *(s++) = c; // US-ASCII subset
+            else { // multi-byte UTF-8 sequence
+                for (b = 0, d = c; d; d /= 2) b++; // number of bits in c
+                b = (b - 2) / 5; // number of bytes in payload
+                *(s++) = (0xFF << (7 - b)) | (c >> (6 * b)); // head
+                while (b) *(s++) = 0x80 | ((c >> (6 * --b)) & 0x3F); // payload
+            }
+
+            memmove(s, strchr(s, ';') + 1, strlen(strchr(s, ';')));
+        }
+        else if ((*s == '&' && (t == '&' || t == ' ' || t == '*')) ||
+                 (*s == '%' && t == '%')) { // entity reference
+            for (b = 0; ent[b] && strncmp(s + 1, ent[b], strlen(ent[b]));
+                 b += 2); // find entity in entity list
+
+            if (ent[b++]) { // found a match
+                if ((c = strlen(ent[b])) - 1 > (e = strchr(s, ';')) - s) {
+                    l = (d = (s - r)) + c + strlen(e); // new length
+                    r = (r == m) ? strcpy(malloc(l), r) : realloc(r, l);
+                    e = strchr((s = r + d), ';'); // fix up pointers
+                }
+
+                memmove(s + c, e + 1, strlen(e)); // shift rest of string
+                strncpy(s, ent[b], c); // copy in replacement text
+            }
+            else s++; // not a known entity
+        }
+        else if ((t == ' ' || t == '*') && isspace(*s)) *(s++) = ' ';
+        else s++; // no decoding needed
+    }
+
+    if (t == '*') { // normalize spaces for non-cdata attributes
+        for (s = r; *s; s++) {
+            if ((l = strspn(s, " "))) memmove(s, s + l, strlen(s + l) + 1);
+            while (*s && *s != ' ') s++;
+        }
+        if (--s >= r && *s == ' ') *s = '\0'; // trim any trailing space
+    }
+    return r;
+}
+
+// called when parser finds start of new tag
+void ezxml_open_tag(ezxml_root_t root, char *name, char **attr)
+{
+    ezxml_t xml = root->cur;
+    
+    if (xml->name) xml = ezxml_add_child(xml, name, strlen(xml->txt));
+    else xml->name = name; // first open tag
+
+    xml->attr = attr;
+    root->cur = xml; // update tag insertion point
+}
+
+// called when parser finds character content between open and closing tag
+void ezxml_char_content(ezxml_root_t root, char *s, size_t len, char t)
+{
+    ezxml_t xml = root->cur;
+    char *m = s;
+    size_t l;
+
+    if (! xml || ! xml->name || ! len) return; // sanity check
+
+    s[len] = '\0'; // null terminate text (calling functions anticipate this)
+    len = strlen(s = ezxml_decode(s, root->ent, t)) + 1;
+
+    if (! *(xml->txt)) xml->txt = s; // initial character content
+    else { // allocate our own memory and make a copy
+        xml->txt = (xml->flags & EZXML_TXTM) // allocate some space
+                   ? realloc(xml->txt, (l = strlen(xml->txt)) + len)
+                   : strcpy(malloc((l = strlen(xml->txt)) + len), xml->txt);
+        strcpy(xml->txt + l, s); // add new char content
+        if (s != m) free(s); // free s if it was malloced by ezxml_decode()
+    }
+
+    if (xml->txt != m) ezxml_set_flag(xml, EZXML_TXTM);
+}
+
+// called when parser finds closing tag
+ezxml_t ezxml_close_tag(ezxml_root_t root, char *name, char *s)
+{
+    if (! root->cur || ! root->cur->name || strcmp(name, root->cur->name))
+        return ezxml_err(root, s, "unexpected closing tag </%s>", name);
+
+    root->cur = root->cur->parent;
+    return NULL;
+}
+
+// checks for circular entity references, returns non-zero if no circular
+// references are found, zero otherwise
+int ezxml_ent_ok(char *name, char *s, char **ent)
+{
+    int i;
+
+    for (; ; s++) {
+        while (*s && *s != '&') s++; // find next entity reference
+        if (! *s) return 1;
+        if (! strncmp(s + 1, name, strlen(name))) return 0; // circular ref.
+        for (i = 0; ent[i] && strncmp(ent[i], s + 1, strlen(ent[i])); i += 2);
+        if (ent[i] && ! ezxml_ent_ok(name, ent[i + 1], ent)) return 0;
+    }
+}
+
+// called when the parser finds a processing instruction
+void ezxml_proc_inst(ezxml_root_t root, char *s, size_t len)
+{
+    int i = 0, j = 1;
+    char *target = s;
+
+    s[len] = '\0'; // null terminate instruction
+    if (*(s += strcspn(s, EZXML_WS))) {
+        *s = '\0'; // null terminate target
+        s += strspn(s + 1, EZXML_WS) + 1; // skip whitespace after target
+    }
+
+    if (! strcmp(target, "xml")) { // <?xml ... ?>
+        if ((s = strstr(s, "standalone")) && ! strncmp(s + strspn(s + 10,
+            EZXML_WS "='\"") + 10, "yes", 3)) root->standalone = 1;
+        return;
+    }
+
+    if (! root->pi[0]) *(root->pi = malloc(sizeof(char **))) = NULL; //first pi
+
+    while (root->pi[i] && strcmp(target, root->pi[i][0])) i++; // find target
+    if (! root->pi[i]) { // new target
+        root->pi = realloc(root->pi, sizeof(char **) * (i + 2));
+        root->pi[i] = malloc(sizeof(char *) * 3);
+        root->pi[i][0] = target;
+        root->pi[i][1] = (char *)(root->pi[i + 1] = NULL); // terminate pi list
+        root->pi[i][2] = strdup(""); // empty document position list
+    }
+
+    while (root->pi[i][j]) j++; // find end of instruction list for this target
+    root->pi[i] = realloc(root->pi[i], sizeof(char *) * (j + 3));
+    root->pi[i][j + 2] = realloc(root->pi[i][j + 1], j + 1);
+    strcpy(root->pi[i][j + 2] + j - 1, (root->xml.name) ? ">" : "<");
+    root->pi[i][j + 1] = NULL; // null terminate pi list for this target
+    root->pi[i][j] = s; // set instruction
+}
+
+// called when the parser finds an internal doctype subset
+short ezxml_internal_dtd(ezxml_root_t root, char *s, size_t len)
+{
+    char q, *c, *t, *n = NULL, *v, **ent, **pe;
+    int i, j;
+    
+    pe = memcpy(malloc(sizeof(EZXML_NIL)), EZXML_NIL, sizeof(EZXML_NIL));
+
+    for (s[len] = '\0'; s; ) {
+        while (*s && *s != '<' && *s != '%') s++; // find next declaration
+
+        if (! *s) break;
+        else if (! strncmp(s, "<!ENTITY", 8)) { // parse entity definitions
+            c = s += strspn(s + 8, EZXML_WS) + 8; // skip white space separator
+            n = s + strspn(s, EZXML_WS "%"); // find name
+            *(s = n + strcspn(n, EZXML_WS)) = ';'; // append ; to name
+
+            v = s + strspn(s + 1, EZXML_WS) + 1; // find value
+            if ((q = *(v++)) != '"' && q != '\'') { // skip externals
+                s = strchr(s, '>');
+                continue;
+            }
+
+            for (i = 0, ent = (*c == '%') ? pe : root->ent; ent[i]; i++);
+            ent = realloc(ent, (i + 3) * sizeof(char *)); // space for next ent
+            if (*c == '%') pe = ent;
+            else root->ent = ent;
+
+            *(++s) = '\0'; // null terminate name
+            if ((s = strchr(v, q))) *(s++) = '\0'; // null terminate value
+            ent[i + 1] = ezxml_decode(v, pe, '%'); // set value
+            ent[i + 2] = NULL; // null terminate entity list
+            if (! ezxml_ent_ok(n, ent[i + 1], ent)) { // circular reference
+                if (ent[i + 1] != v) free(ent[i + 1]);
+                ezxml_err(root, v, "circular entity declaration &%s", n);
+                break;
+            }
+            else ent[i] = n; // set entity name
+        }
+        else if (! strncmp(s, "<!ATTLIST", 9)) { // parse default attributes
+            t = s + strspn(s + 9, EZXML_WS) + 9; // skip whitespace separator
+            if (! *t) { ezxml_err(root, t, "unclosed <!ATTLIST"); break; }
+            if (*(s = t + strcspn(t, EZXML_WS ">")) == '>') continue;
+            else *s = '\0'; // null terminate tag name
+            for (i = 0; root->attr[i] && strcmp(n, root->attr[i][0]); i++);
+
+            while (*(n = ++s + strspn(s, EZXML_WS)) && *n != '>') {
+                if (*(s = n + strcspn(n, EZXML_WS))) *s = '\0'; // attr name
+                else { ezxml_err(root, t, "malformed <!ATTLIST"); break; }
+
+                s += strspn(s + 1, EZXML_WS) + 1; // find next token
+                c = (strncmp(s, "CDATA", 5)) ? "*" : " "; // is it cdata?
+                if (! strncmp(s, "NOTATION", 8))
+                    s += strspn(s + 8, EZXML_WS) + 8;
+                s = (*s == '(') ? strchr(s, ')') : s + strcspn(s, EZXML_WS);
+                if (! s) { ezxml_err(root, t, "malformed <!ATTLIST"); break; }
+
+                s += strspn(s, EZXML_WS ")"); // skip white space separator
+                if (! strncmp(s, "#FIXED", 6))
+                    s += strspn(s + 6, EZXML_WS) + 6;
+                if (*s == '#') { // no default value
+                    s += strcspn(s, EZXML_WS ">") - 1;
+                    if (*c == ' ') continue; // cdata is default, nothing to do
+                    v = NULL;
+                }
+                else if ((*s == '"' || *s == '\'')  &&  // default value
+                         (s = strchr(v = s + 1, *s))) *s = '\0';
+                else { ezxml_err(root, t, "malformed <!ATTLIST"); break; }
+
+                if (! root->attr[i]) { // new tag name
+                    root->attr = (! i) ? malloc(2 * sizeof(char **))
+                                       : realloc(root->attr,
+                                                 (i + 2) * sizeof(char **));
+                    root->attr[i] = malloc(2 * sizeof(char *));
+                    root->attr[i][0] = t; // set tag name
+                    root->attr[i][1] = (char *)(root->attr[i + 1] = NULL);
+                }
+
+                for (j = 1; root->attr[i][j]; j += 3); // find end of list
+                root->attr[i] = realloc(root->attr[i],
+                                        (j + 4) * sizeof(char *));
+
+                root->attr[i][j + 3] = NULL; // null terminate list
+                root->attr[i][j + 2] = c; // is it cdata?
+                root->attr[i][j + 1] = (v) ? ezxml_decode(v, root->ent, *c)
+                                           : NULL;
+                root->attr[i][j] = n; // attribute name 
+            }
+        }
+        else if (! strncmp(s, "<!--", 4)) s = strstr(s + 4, "-->"); // comments
+        else if (! strncmp(s, "<?", 2)) { // processing instructions
+            if ((s = strstr(c = s + 2, "?>")))
+                ezxml_proc_inst(root, c, s++ - c);
+        }
+        else if (*s == '<') s = strchr(s, '>'); // skip other declarations
+        else if (*(s++) == '%' && ! root->standalone) break;
+    }
+
+    free(pe);
+    return ! *root->err;
+}
+
+// Converts a UTF-16 string to UTF-8. Returns a new string that must be freed
+// or NULL if no conversion was needed.
+char *ezxml_str2utf8(char **s, size_t *len)
+{
+    char *u;
+    size_t l = 0, sl, max = *len;
+    long c, d;
+    int b, be = (**s == '\xFE') ? 1 : (**s == '\xFF') ? 0 : -1;
+
+    if (be == -1) return NULL; // not UTF-16
+
+    u = malloc(max);
+    for (sl = 2; sl < *len - 1; sl += 2) {
+        c = (be) ? (((*s)[sl] & 0xFF) << 8) | ((*s)[sl + 1] & 0xFF)  //UTF-16BE
+                 : (((*s)[sl + 1] & 0xFF) << 8) | ((*s)[sl] & 0xFF); //UTF-16LE
+        if (c >= 0xD800 && c <= 0xDFFF && (sl += 2) < *len - 1) { // high-half
+            d = (be) ? (((*s)[sl] & 0xFF) << 8) | ((*s)[sl + 1] & 0xFF)
+                     : (((*s)[sl + 1] & 0xFF) << 8) | ((*s)[sl] & 0xFF);
+            c = (((c & 0x3FF) << 10) | (d & 0x3FF)) + 0x10000;
+        }
+
+        while (l + 6 > max) u = realloc(u, max += EZXML_BUFSIZE);
+        if (c < 0x80) u[l++] = c; // US-ASCII subset
+        else { // multi-byte UTF-8 sequence
+            for (b = 0, d = c; d; d /= 2) b++; // bits in c
+            b = (b - 2) / 5; // bytes in payload
+            u[l++] = (0xFF << (7 - b)) | (c >> (6 * b)); // head
+            while (b) u[l++] = 0x80 | ((c >> (6 * --b)) & 0x3F); // payload
+        }
+    }
+    return *s = realloc(u, *len = l);
+}
+
+// frees a tag attribute list
+void ezxml_free_attr(char **attr) {
+    int i = 0;
+    char *m;
+    
+    if (! attr || attr == EZXML_NIL) return; // nothing to free
+    while (attr[i]) i += 2; // find end of attribute list
+    m = attr[i + 1]; // list of which names and values are malloced
+    for (i = 0; m[i]; i++) {
+        if (m[i] & EZXML_NAMEM) free(attr[i * 2]);
+        if (m[i] & EZXML_TXTM) free(attr[(i * 2) + 1]);
+    }
+    free(m);
+    free(attr);
+}
+
+// parse the given xml string and return an ezxml structure
+ezxml_t ezxml_parse_str(char *s, size_t len)
+{
+    ezxml_root_t root = (ezxml_root_t)ezxml_new(NULL);
+    char q, e, *d, **attr, **a = NULL; // initialize a to avoid compile warning
+    int l, i, j;
+
+    root->m = s;
+    if (! len) return ezxml_err(root, NULL, "root tag missing");
+    root->u = ezxml_str2utf8(&s, &len); // convert utf-16 to utf-8
+    root->e = (root->s = s) + len; // record start and end of work area
+    
+    e = s[len - 1]; // save end char
+    s[len - 1] = '\0'; // turn end char into null terminator
+
+    while (*s && *s != '<') s++; // find first tag
+    if (! *s) return ezxml_err(root, s, "root tag missing");
+
+    for (; ; ) {
+        attr = (char **)EZXML_NIL;
+        d = ++s;
+        
+        if (isalpha(*s) || *s == '_' || *s == ':' || *s < '\0') { // new tag
+            if (! root->cur)
+                return ezxml_err(root, d, "markup outside of root element");
+
+            s += strcspn(s, EZXML_WS "/>");
+            while (isspace(*s)) *(s++) = '\0'; // null terminate tag name
+  
+            if (*s && *s != '/' && *s != '>') // find tag in default attr list
+                for (i = 0; (a = root->attr[i]) && strcmp(a[0], d); i++);
+
+            for (l = 0; *s && *s != '/' && *s != '>'; l += 2) { // new attrib
+                attr = (l) ? realloc(attr, (l + 4) * sizeof(char *))
+                           : malloc(4 * sizeof(char *)); // allocate space
+                attr[l + 3] = (l) ? realloc(attr[l + 1], (l / 2) + 2)
+                                  : malloc(2); // mem for list of maloced vals
+                strcpy(attr[l + 3] + (l / 2), " "); // value is not malloced
+                attr[l + 2] = NULL; // null terminate list
+                attr[l + 1] = ""; // temporary attribute value
+                attr[l] = s; // set attribute name
+
+                s += strcspn(s, EZXML_WS "=/>");
+                if (*s == '=' || isspace(*s)) { 
+                    *(s++) = '\0'; // null terminate tag attribute name
+                    q = *(s += strspn(s, EZXML_WS "="));
+                    if (q == '"' || q == '\'') { // attribute value
+                        attr[l + 1] = ++s;
+                        while (*s && *s != q) s++;
+                        if (*s) *(s++) = '\0'; // null terminate attribute val
+                        else {
+                            ezxml_free_attr(attr);
+                            return ezxml_err(root, d, "missing %c", q);
+                        }
+
+                        for (j = 1; a && a[j] && strcmp(a[j], attr[l]); j +=3);
+                        attr[l + 1] = ezxml_decode(attr[l + 1], root->ent, (a
+                                                   && a[j]) ? *a[j + 2] : ' ');
+                        if (attr[l + 1] < d || attr[l + 1] > s)
+                            attr[l + 3][l / 2] = EZXML_TXTM; // value malloced
+                    }
+                }
+                while (isspace(*s)) s++;
+            }
+
+            if (*s == '/') { // self closing tag
+                *(s++) = '\0';
+                if ((*s && *s != '>') || (! *s && e != '>')) {
+                    if (l) ezxml_free_attr(attr);
+                    return ezxml_err(root, d, "missing >");
+                }
+                ezxml_open_tag(root, d, attr);
+                ezxml_close_tag(root, d, s);
+            }
+            else if ((q = *s) == '>' || (! *s && e == '>')) { // open tag
+                *s = '\0'; // temporarily null terminate tag name
+                ezxml_open_tag(root, d, attr);
+                *s = q;
+            }
+            else {
+                if (l) ezxml_free_attr(attr);
+                return ezxml_err(root, d, "missing >"); 
+            }
+        }
+        else if (*s == '/') { // close tag
+            s += strcspn(d = s + 1, EZXML_WS ">") + 1;
+            if (! (q = *s) && e != '>') return ezxml_err(root, d, "missing >");
+            *s = '\0'; // temporarily null terminate tag name
+            if (ezxml_close_tag(root, d, s)) return &root->xml;
+            if (isspace(*s = q)) s += strspn(s, EZXML_WS);
+        }
+        else if (! strncmp(s, "!--", 3)) { // xml comment
+            if (! (s = strstr(s + 3, "--")) || (*(s += 2) != '>' && *s) ||
+                (! *s && e != '>')) return ezxml_err(root, d, "unclosed <!--");
+        }
+        else if (! strncmp(s, "![CDATA[", 8)) { // cdata
+            if ((s = strstr(s, "]]>")))
+                ezxml_char_content(root, d + 8, (s += 2) - d - 10, 'c');
+            else return ezxml_err(root, d, "unclosed <![CDATA[");
+        }
+        else if (! strncmp(s, "!DOCTYPE", 8)) { // dtd
+            for (l = 0; *s && ((! l && *s != '>') || (l && (*s != ']' || 
+                 *(s + strspn(s + 1, EZXML_WS) + 1) != '>')));
+                 l = (*s == '[') ? 1 : l) s += strcspn(s + 1, "[]>") + 1;
+            if (! *s && e != '>')
+                return ezxml_err(root, d, "unclosed <!DOCTYPE");
+            d = (l) ? strchr(d, '[') + 1 : d;
+            if (l && ! ezxml_internal_dtd(root, d, s++ - d)) return &root->xml;
+        }
+        else if (*s == '?') { // <?...?> processing instructions
+            do { s = strchr(s, '?'); } while (s && *(++s) && *s != '>');
+            if (! s || (! *s && e != '>')) 
+                return ezxml_err(root, d, "unclosed <?");
+            else ezxml_proc_inst(root, d + 1, s - d - 2);
+        }
+        else return ezxml_err(root, d, "unexpected <");
+        
+        if (! s || ! *s) break;
+        *s = '\0';
+        d = ++s;
+        if (*s && *s != '<') { // tag character content
+            while (*s && *s != '<') s++;
+            if (*s) ezxml_char_content(root, d, s - d, '&');
+            else break;
+        }
+        else if (! *s) break;
+    }
+
+    if (! root->cur) return &root->xml;
+    else if (! root->cur->name) return ezxml_err(root, d, "root tag missing");
+    else return ezxml_err(root, d, "unclosed tag <%s>", root->cur->name);
+}
+
+// Wrapper for ezxml_parse_str() that accepts a file stream. Reads the entire
+// stream into memory and then parses it. For xml files, use ezxml_parse_file()
+// or ezxml_parse_fd()
+ezxml_t ezxml_parse_fp(FILE *fp)
+{
+    ezxml_root_t root;
+    size_t l, len = 0;
+    char *s;
+
+    if (! (s = malloc(EZXML_BUFSIZE))) return NULL;
+    do {
+        len += (l = fread((s + len), 1, EZXML_BUFSIZE, fp));
+        if (l == EZXML_BUFSIZE) s = realloc(s, len + EZXML_BUFSIZE);
+    } while (s && l == EZXML_BUFSIZE);
+
+    if (! s) return NULL;
+    root = (ezxml_root_t)ezxml_parse_str(s, len);
+    root->len = -1; // so we know to free s in ezxml_free()
+    return &root->xml;
+}
+
+// A wrapper for ezxml_parse_str() that accepts a file descriptor. First
+// attempts to mem map the file. Failing that, reads the file into memory.
+// Returns NULL on failure.
+ezxml_t ezxml_parse_fd(int fd)
+{
+    ezxml_root_t root;
+    struct stat st;
+    size_t l;
+    void *m;
+
+    if (fd < 0) return NULL;
+    fstat(fd, &st);
+
+#ifndef EZXML_NOMMAP
+    l = (st.st_size + sysconf(_SC_PAGESIZE) - 1) & ~(sysconf(_SC_PAGESIZE) -1);
+    if ((m = mmap(NULL, l, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0)) !=
+        MAP_FAILED) {
+        madvise(m, l, MADV_SEQUENTIAL); // optimize for sequential access
+        root = (ezxml_root_t)ezxml_parse_str(m, st.st_size);
+        madvise(m, root->len = l, MADV_NORMAL); // put it back to normal
+    }
+    else { // mmap failed, read file into memory
+#endif // EZXML_NOMMAP
+        l = read(fd, m = malloc(st.st_size), st.st_size);
+        root = (ezxml_root_t)ezxml_parse_str(m, l);
+        root->len = -1; // so we know to free s in ezxml_free()
+#ifndef EZXML_NOMMAP
+    }
+#endif // EZXML_NOMMAP
+    return &root->xml;
+}
+
+// a wrapper for ezxml_parse_fd that accepts a file name
+ezxml_t ezxml_parse_file(const char *file)
+{
+    int fd = open(file, O_RDONLY, 0);
+    ezxml_t xml = ezxml_parse_fd(fd);
+    
+    if (fd >= 0) close(fd);
+    return xml;
+}
+
+// Encodes ampersand sequences appending the results to *dst, reallocating *dst
+// if length excedes max. a is non-zero for attribute encoding. Returns *dst
+char *ezxml_ampencode(const char *s, size_t len, char **dst, size_t *dlen,
+                      size_t *max, short a)
+{
+    const char *e;
+    
+    for (e = s + len; s != e; s++) {
+        while (*dlen + 10 > *max) *dst = realloc(*dst, *max += EZXML_BUFSIZE);
+
+        switch (*s) {
+        case '\0': return *dst;
+        case '&': *dlen += sprintf(*dst + *dlen, "&amp;"); break;
+        case '<': *dlen += sprintf(*dst + *dlen, "&lt;"); break;
+        case '>': *dlen += sprintf(*dst + *dlen, "&gt;"); break;
+        case '"': *dlen += sprintf(*dst + *dlen, (a) ? "&quot;" : "\""); break;
+        case '\n': *dlen += sprintf(*dst + *dlen, (a) ? "&#xA;" : "\n"); break;
+        case '\t': *dlen += sprintf(*dst + *dlen, (a) ? "&#x9;" : "\t"); break;
+        case '\r': *dlen += sprintf(*dst + *dlen, "&#xD;"); break;
+        default: (*dst)[(*dlen)++] = *s;
+        }
+    }
+    return *dst;
+}
+
+// Recursively converts each tag to xml appending it to *s. Reallocates *s if
+// its length excedes max. start is the location of the previous tag in the
+// parent tag's character content. Returns *s.
+char *ezxml_toxml_r(ezxml_t xml, char **s, size_t *len, size_t *max,
+                    size_t start, char ***attr)
+{
+    int i, j;
+    char *txt = (xml->parent) ? xml->parent->txt : "";
+    size_t off = 0;
+
+    // parent character content up to this tag
+    *s = ezxml_ampencode(txt + start, xml->off - start, s, len, max, 0);
+
+    while (*len + strlen(xml->name) + 4 > *max) // reallocate s
+        *s = realloc(*s, *max += EZXML_BUFSIZE);
+
+    *len += sprintf(*s + *len, "<%s", xml->name); // open tag
+    for (i = 0; xml->attr[i]; i += 2) { // tag attributes
+        if (ezxml_attr(xml, xml->attr[i]) != xml->attr[i + 1]) continue;
+        while (*len + strlen(xml->attr[i]) + 7 > *max) // reallocate s
+            *s = realloc(*s, *max += EZXML_BUFSIZE);
+
+        *len += sprintf(*s + *len, " %s=\"", xml->attr[i]);
+        ezxml_ampencode(xml->attr[i + 1], -1, s, len, max, 1);
+        *len += sprintf(*s + *len, "\"");
+    }
+
+    for (i = 0; attr[i] && strcmp(attr[i][0], xml->name); i++);
+    for (j = 1; attr[i] && attr[i][j]; j += 3) { // default attributes
+        if (! attr[i][j + 1] || ezxml_attr(xml, attr[i][j]) != attr[i][j + 1])
+            continue; // skip duplicates and non-values
+        while (*len + strlen(attr[i][j]) + 7 > *max) // reallocate s
+            *s = realloc(*s, *max += EZXML_BUFSIZE);
+
+        *len += sprintf(*s + *len, " %s=\"", attr[i][j]);
+        ezxml_ampencode(attr[i][j + 1], -1, s, len, max, 1);
+        *len += sprintf(*s + *len, "\"");
+    }
+    *len += sprintf(*s + *len, ">");
+
+    *s = (xml->child) ? ezxml_toxml_r(xml->child, s, len, max, 0, attr) //child
+                      : ezxml_ampencode(xml->txt, -1, s, len, max, 0);  //data
+    
+    while (*len + strlen(xml->name) + 4 > *max) // reallocate s
+        *s = realloc(*s, *max += EZXML_BUFSIZE);
+
+    *len += sprintf(*s + *len, "</%s>", xml->name); // close tag
+
+    while (txt[off] && off < xml->off) off++; // make sure off is within bounds
+    return (xml->ordered) ? ezxml_toxml_r(xml->ordered, s, len, max, off, attr)
+                          : ezxml_ampencode(txt + off, -1, s, len, max, 0);
+}
+
+// Converts an ezxml structure back to xml. Returns a string of xml data that
+// must be freed.
+char *ezxml_toxml(ezxml_t xml)
+{
+    ezxml_t p = (xml) ? xml->parent : NULL, o = (xml) ? xml->ordered : NULL;
+    ezxml_root_t root = (ezxml_root_t)xml;
+    size_t len = 0, max = EZXML_BUFSIZE;
+    char *s = strcpy(malloc(max), ""), *t, *n;
+    int i, j, k;
+
+    if (! xml || ! xml->name) return realloc(s, len + 1);
+    while (root->xml.parent) root = (ezxml_root_t)root->xml.parent; // root tag
+
+    for (i = 0; ! p && root->pi[i]; i++) { // pre-root processing instructions
+        for (k = 2; root->pi[i][k - 1]; k++);
+        for (j = 1; (n = root->pi[i][j]); j++) {
+            if (root->pi[i][k][j - 1] == '>') continue; // not pre-root
+            while (len + strlen(t = root->pi[i][0]) + strlen(n) + 7 > max)
+                s = realloc(s, max += EZXML_BUFSIZE);
+            len += sprintf(s + len, "<?%s%s%s?>\n", t, *n ? " " : "", n);
+        }
+    }
+
+    xml->parent = xml->ordered = NULL;
+    s = ezxml_toxml_r(xml, &s, &len, &max, 0, root->attr);
+    xml->parent = p;
+    xml->ordered = o;
+
+    for (i = 0; ! p && root->pi[i]; i++) { // post-root processing instructions
+        for (k = 2; root->pi[i][k - 1]; k++);
+        for (j = 1; (n = root->pi[i][j]); j++) {
+            if (root->pi[i][k][j - 1] == '<') continue; // not post-root
+            while (len + strlen(t = root->pi[i][0]) + strlen(n) + 7 > max)
+                s = realloc(s, max += EZXML_BUFSIZE);
+            len += sprintf(s + len, "\n<?%s%s%s?>", t, *n ? " " : "", n);
+        }
+    }
+    return realloc(s, len + 1);
+}
+
+// free the memory allocated for the ezxml structure
+void ezxml_free(ezxml_t xml)
+{
+    ezxml_root_t root = (ezxml_root_t)xml;
+    int i, j;
+    char **a, *s;
+
+    if (! xml) return;
+    ezxml_free(xml->child);
+    ezxml_free(xml->ordered);
+
+    if (! xml->parent) { // free root tag allocations
+        for (i = 10; root->ent[i]; i += 2) // 0 - 9 are default entites (<>&"')
+            if ((s = root->ent[i + 1]) < root->s || s > root->e) free(s);
+        free(root->ent); // free list of general entities
+
+        for (i = 0; (a = root->attr[i]); i++) {
+            for (j = 1; a[j++]; j += 2) // free malloced attribute values
+                if (a[j] && (a[j] < root->s || a[j] > root->e)) free(a[j]);
+            free(a);
+        }
+        if (root->attr[0]) free(root->attr); // free default attribute list
+
+        for (i = 0; root->pi[i]; i++) {
+            for (j = 1; root->pi[i][j]; j++);
+            free(root->pi[i][j + 1]);
+            free(root->pi[i]);
+        }            
+        if (root->pi[0]) free(root->pi); // free processing instructions
+
+        if (root->len == -1) free(root->m); // malloced xml data
+#ifndef EZXML_NOMMAP
+        else if (root->len) munmap(root->m, root->len); // mem mapped xml data
+#endif // EZXML_NOMMAP
+        if (root->u) free(root->u); // utf8 conversion
+    }
+
+    ezxml_free_attr(xml->attr); // tag attributes
+    if ((xml->flags & EZXML_TXTM)) free(xml->txt); // character content
+    if ((xml->flags & EZXML_NAMEM)) free(xml->name); // tag name
+    free(xml);
+}
+
+// return parser error message or empty string if none
+const char *ezxml_error(ezxml_t xml)
+{
+    while (xml && xml->parent) xml = xml->parent; // find root tag
+    return (xml) ? ((ezxml_root_t)xml)->err : "";
+}
+
+// returns a new empty ezxml structure with the given root tag name
+ezxml_t ezxml_new(const char *name)
+{
+    static char *ent[] = { "lt;", "&#60;", "gt;", "&#62;", "quot;", "&#34;",
+                           "apos;", "&#39;", "amp;", "&#38;", NULL };
+    ezxml_root_t root = (ezxml_root_t)memset(malloc(sizeof(struct ezxml_root)), 
+                                             '\0', sizeof(struct ezxml_root));
+    root->xml.name = (char *)name;
+    root->cur = &root->xml;
+    strcpy(root->err, root->xml.txt = "");
+    root->ent = memcpy(malloc(sizeof(ent)), ent, sizeof(ent));
+    root->attr = root->pi = (char ***)(root->xml.attr = EZXML_NIL);
+    return &root->xml;
+}
+
+// inserts an existing tag into an ezxml structure
+ezxml_t ezxml_insert(ezxml_t xml, ezxml_t dest, size_t off)
+{
+    ezxml_t cur, prev, head;
+
+    xml->next = xml->sibling = xml->ordered = NULL;
+    xml->off = off;
+    xml->parent = dest;
+
+    if ((head = dest->child)) { // already have sub tags
+        if (head->off <= off) { // not first subtag
+            for (cur = head; cur->ordered && cur->ordered->off <= off;
+                 cur = cur->ordered);
+            xml->ordered = cur->ordered;
+            cur->ordered = xml;
+        }
+        else { // first subtag
+            xml->ordered = head;
+            dest->child = xml;
+        }
+
+        for (cur = head, prev = NULL; cur && strcmp(cur->name, xml->name);
+             prev = cur, cur = cur->sibling); // find tag type
+        if (cur && cur->off <= off) { // not first of type
+            while (cur->next && cur->next->off <= off) cur = cur->next;
+            xml->next = cur->next;
+            cur->next = xml;
+        }
+        else { // first tag of this type
+            if (prev && cur) prev->sibling = cur->sibling; // remove old first
+            xml->next = cur; // old first tag is now next
+            for (cur = head, prev = NULL; cur && cur->off <= off;
+                 prev = cur, cur = cur->sibling); // new sibling insert point
+            xml->sibling = cur;
+            if (prev) prev->sibling = xml;
+        }
+    }
+    else dest->child = xml; // only sub tag
+
+    return xml;
+}
+
+// Adds a child tag. off is the offset of the child tag relative to the start
+// of the parent tag's character content. Returns the child tag.
+ezxml_t ezxml_add_child(ezxml_t xml, const char *name, size_t off)
+{
+    ezxml_t child;
+
+    if (! xml) return NULL;
+    child = (ezxml_t)memset(malloc(sizeof(struct ezxml)), '\0',
+                            sizeof(struct ezxml));
+    child->name = (char *)name;
+    child->attr = EZXML_NIL;
+    child->txt = "";
+
+    return ezxml_insert(child, xml, off);
+}
+
+// sets the character content for the given tag and returns the tag
+ezxml_t ezxml_set_txt(ezxml_t xml, const char *txt)
+{
+    if (! xml) return NULL;
+    if (xml->flags & EZXML_TXTM) free(xml->txt); // existing txt was malloced
+    xml->flags &= ~EZXML_TXTM;
+    xml->txt = (char *)txt;
+    return xml;
+}
+
+// Sets the given tag attribute or adds a new attribute if not found. A value
+// of NULL will remove the specified attribute. Returns the tag given.
+ezxml_t ezxml_set_attr(ezxml_t xml, const char *name, const char *value)
+{
+    int l = 0, c;
+
+    if (! xml) return NULL;
+    while (xml->attr[l] && strcmp(xml->attr[l], name)) l += 2;
+    if (! xml->attr[l]) { // not found, add as new attribute
+        if (! value) return xml; // nothing to do
+        if (xml->attr == EZXML_NIL) { // first attribute
+            xml->attr = malloc(4 * sizeof(char *));
+            xml->attr[1] = strdup(""); // empty list of malloced names/vals
+        }
+        else xml->attr = realloc(xml->attr, (l + 4) * sizeof(char *));
+
+        xml->attr[l] = (char *)name; // set attribute name
+        xml->attr[l + 2] = NULL; // null terminate attribute list
+        xml->attr[l + 3] = realloc(xml->attr[l + 1],
+                                   (c = strlen(xml->attr[l + 1])) + 2);
+        strcpy(xml->attr[l + 3] + c, " "); // set name/value as not malloced
+        if (xml->flags & EZXML_DUP) xml->attr[l + 3][c] = EZXML_NAMEM;
+    }
+    else if (xml->flags & EZXML_DUP) free((char *)name); // name was strduped
+
+    for (c = l; xml->attr[c]; c += 2); // find end of attribute list
+    if (xml->attr[c + 1][l / 2] & EZXML_TXTM) free(xml->attr[l + 1]); //old val
+    if (xml->flags & EZXML_DUP) xml->attr[c + 1][l / 2] |= EZXML_TXTM;
+    else xml->attr[c + 1][l / 2] &= ~EZXML_TXTM;
+
+    if (value) xml->attr[l + 1] = (char *)value; // set attribute value
+    else { // remove attribute
+        if (xml->attr[c + 1][l / 2] & EZXML_NAMEM) free(xml->attr[l]);
+        memmove(xml->attr + l, xml->attr + l + 2, (c - l + 2) * sizeof(char*));
+        xml->attr = realloc(xml->attr, (c + 2) * sizeof(char *));
+        memmove(xml->attr[c + 1] + (l / 2), xml->attr[c + 1] + (l / 2) + 1,
+                (c / 2) - (l / 2)); // fix list of which name/vals are malloced
+    }
+    xml->flags &= ~EZXML_DUP; // clear strdup() flag
+    return xml;
+}
+
+// sets a flag for the given tag and returns the tag
+ezxml_t ezxml_set_flag(ezxml_t xml, short flag)
+{
+    if (xml) xml->flags |= flag;
+    return xml;
+}
+
+// removes a tag along with its subtags without freeing its memory
+ezxml_t ezxml_cut(ezxml_t xml)
+{
+    ezxml_t cur;
+
+    if (! xml) return NULL; // nothing to do
+    if (xml->next) xml->next->sibling = xml->sibling; // patch sibling list
+
+    if (xml->parent) { // not root tag
+        cur = xml->parent->child; // find head of subtag list
+        if (cur == xml) xml->parent->child = xml->ordered; // first subtag
+        else { // not first subtag
+            while (cur->ordered != xml) cur = cur->ordered;
+            cur->ordered = cur->ordered->ordered; // patch ordered list
+
+            cur = xml->parent->child; // go back to head of subtag list
+            if (strcmp(cur->name, xml->name)) { // not in first sibling list
+                while (strcmp(cur->sibling->name, xml->name))
+                    cur = cur->sibling;
+                if (cur->sibling == xml) { // first of a sibling list
+                    cur->sibling = (xml->next) ? xml->next
+                                               : cur->sibling->sibling;
+                }
+                else cur = cur->sibling; // not first of a sibling list
+            }
+
+            while (cur->next && cur->next != xml) cur = cur->next;
+            if (cur->next) cur->next = cur->next->next; // patch next list
+        }        
+    }
+    xml->ordered = xml->sibling = xml->next = NULL;
+    return xml;
+}
+
+#ifdef EZXML_TEST // test harness
+int main(int argc, char **argv)
+{
+    ezxml_t xml;
+    char *s;
+    int i;
+
+    if (argc != 2) return fprintf(stderr, "usage: %s xmlfile\n", argv[0]);
+
+    xml = ezxml_parse_file(argv[1]);
+    printf("%s\n", (s = ezxml_toxml(xml)));
+    free(s);
+    i = fprintf(stderr, "%s", ezxml_error(xml));
+    ezxml_free(xml);
+    return (i) ? 1 : 0;
+}
+#endif // EZXML_TEST
diff --git a/3rdparty/ezxml/ezxml.h b/3rdparty/ezxml/ezxml.h
new file mode 100644
index 0000000..3e02078
--- /dev/null
+++ b/3rdparty/ezxml/ezxml.h
@@ -0,0 +1,167 @@
+/* ezxml.h
+ *
+ * Copyright 2004-2006 Aaron Voisine <aaron@voisine.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _EZXML_H
+#define _EZXML_H
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <fcntl.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define EZXML_BUFSIZE 1024 // size of internal memory buffers
+#define EZXML_NAMEM   0x80 // name is malloced
+#define EZXML_TXTM    0x40 // txt is malloced
+#define EZXML_DUP     0x20 // attribute name and value are strduped
+
+typedef struct ezxml *ezxml_t;
+struct ezxml {
+    char *name;      // tag name
+    char **attr;     // tag attributes { name, value, name, value, ... NULL }
+    char *txt;       // tag character content, empty string if none
+    size_t off;      // tag offset from start of parent tag character content
+    ezxml_t next;    // next tag with same name in this section at this depth
+    ezxml_t sibling; // next tag with different name in same section and depth
+    ezxml_t ordered; // next tag, same section and depth, in original order
+    ezxml_t child;   // head of sub tag list, NULL if none
+    ezxml_t parent;  // parent tag, NULL if current tag is root tag
+    short flags;     // additional information
+};
+
+// Given a string of xml data and its length, parses it and creates an ezxml
+// structure. For efficiency, modifies the data by adding null terminators
+// and decoding ampersand sequences. If you don't want this, copy the data and
+// pass in the copy. Returns NULL on failure.
+ezxml_t ezxml_parse_str(char *s, size_t len);
+
+// A wrapper for ezxml_parse_str() that accepts a file descriptor. First
+// attempts to mem map the file. Failing that, reads the file into memory.
+// Returns NULL on failure.
+ezxml_t ezxml_parse_fd(int fd);
+
+// a wrapper for ezxml_parse_fd() that accepts a file name
+ezxml_t ezxml_parse_file(const char *file);
+    
+// Wrapper for ezxml_parse_str() that accepts a file stream. Reads the entire
+// stream into memory and then parses it. For xml files, use ezxml_parse_file()
+// or ezxml_parse_fd()
+ezxml_t ezxml_parse_fp(FILE *fp);
+
+// returns the first child tag (one level deeper) with the given name or NULL
+// if not found
+ezxml_t ezxml_child(ezxml_t xml, const char *name);
+
+// returns the next tag of the same name in the same section and depth or NULL
+// if not found
+#define ezxml_next(xml) ((xml) ? xml->next : NULL)
+
+// Returns the Nth tag with the same name in the same section at the same depth
+// or NULL if not found. An index of 0 returns the tag given.
+ezxml_t ezxml_idx(ezxml_t xml, int idx);
+
+// returns the name of the given tag
+#define ezxml_name(xml) ((xml) ? xml->name : NULL)
+
+// returns the given tag's character content or empty string if none
+#define ezxml_txt(xml) ((xml) ? xml->txt : "")
+
+// returns the value of the requested tag attribute, or NULL if not found
+const char *ezxml_attr(ezxml_t xml, const char *attr);
+
+// Traverses the ezxml sturcture to retrieve a specific subtag. Takes a
+// variable length list of tag names and indexes. The argument list must be
+// terminated by either an index of -1 or an empty string tag name. Example: 
+// title = ezxml_get(library, "shelf", 0, "book", 2, "title", -1);
+// This retrieves the title of the 3rd book on the 1st shelf of library.
+// Returns NULL if not found.
+ezxml_t ezxml_get(ezxml_t xml, ...);
+
+// Converts an ezxml structure back to xml. Returns a string of xml data that
+// must be freed.
+char *ezxml_toxml(ezxml_t xml);
+
+// returns a NULL terminated array of processing instructions for the given
+// target
+const char **ezxml_pi(ezxml_t xml, const char *target);
+
+// frees the memory allocated for an ezxml structure
+void ezxml_free(ezxml_t xml);
+    
+// returns parser error message or empty string if none
+const char *ezxml_error(ezxml_t xml);
+
+// returns a new empty ezxml structure with the given root tag name
+ezxml_t ezxml_new(const char *name);
+
+// wrapper for ezxml_new() that strdup()s name
+#define ezxml_new_d(name) ezxml_set_flag(ezxml_new(strdup(name)), EZXML_NAMEM)
+
+// Adds a child tag. off is the offset of the child tag relative to the start
+// of the parent tag's character content. Returns the child tag.
+ezxml_t ezxml_add_child(ezxml_t xml, const char *name, size_t off);
+
+// wrapper for ezxml_add_child() that strdup()s name
+#define ezxml_add_child_d(xml, name, off) \
+    ezxml_set_flag(ezxml_add_child(xml, strdup(name), off), EZXML_NAMEM)
+
+// sets the character content for the given tag and returns the tag
+ezxml_t ezxml_set_txt(ezxml_t xml, const char *txt);
+
+// wrapper for ezxml_set_txt() that strdup()s txt
+#define ezxml_set_txt_d(xml, txt) \
+    ezxml_set_flag(ezxml_set_txt(xml, strdup(txt)), EZXML_TXTM)
+
+// Sets the given tag attribute or adds a new attribute if not found. A value
+// of NULL will remove the specified attribute. Returns the tag given.
+ezxml_t ezxml_set_attr(ezxml_t xml, const char *name, const char *value);
+
+// Wrapper for ezxml_set_attr() that strdup()s name/value. Value cannot be NULL
+#define ezxml_set_attr_d(xml, name, value) \
+    ezxml_set_attr(ezxml_set_flag(xml, EZXML_DUP), strdup(name), strdup(value))
+
+// sets a flag for the given tag and returns the tag
+ezxml_t ezxml_set_flag(ezxml_t xml, short flag);
+
+// removes a tag along with its subtags without freeing its memory
+ezxml_t ezxml_cut(ezxml_t xml);
+
+// inserts an existing tag into an ezxml structure
+ezxml_t ezxml_insert(ezxml_t xml, ezxml_t dest, size_t off);
+
+// Moves an existing tag to become a subtag of dest at the given offset from
+// the start of dest's character content. Returns the moved tag.
+#define ezxml_move(xml, dest, off) ezxml_insert(ezxml_cut(xml), dest, off)
+
+// removes a tag along with all its subtags
+#define ezxml_remove(xml) ezxml_free(ezxml_cut(xml))
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // _EZXML_H
diff --git a/3rdparty/stb_ds.h b/3rdparty/stb_ds.h
new file mode 100644
index 0000000..e84c82d
--- /dev/null
+++ b/3rdparty/stb_ds.h
@@ -0,0 +1,1895 @@
+/* stb_ds.h - v0.67 - public domain data structures - Sean Barrett 2019
+
+   This is a single-header-file library that provides easy-to-use
+   dynamic arrays and hash tables for C (also works in C++).
+
+   For a gentle introduction:
+      http://nothings.org/stb_ds
+
+   To use this library, do this in *one* C or C++ file:
+      #define STB_DS_IMPLEMENTATION
+      #include "stb_ds.h"
+
+TABLE OF CONTENTS
+
+  Table of Contents
+  Compile-time options
+  License
+  Documentation
+  Notes
+  Notes - Dynamic arrays
+  Notes - Hash maps
+  Credits
+
+COMPILE-TIME OPTIONS
+
+  #define STBDS_NO_SHORT_NAMES
+
+     This flag needs to be set globally.
+
+     By default stb_ds exposes shorter function names that are not qualified
+     with the "stbds_" prefix. If these names conflict with the names in your
+     code, define this flag.
+
+  #define STBDS_SIPHASH_2_4
+
+     This flag only needs to be set in the file containing #define STB_DS_IMPLEMENTATION.
+
+     By default stb_ds.h hashes using a weaker variant of SipHash and a custom hash for
+     4- and 8-byte keys. On 64-bit platforms, you can define the above flag to force
+     stb_ds.h to use specification-compliant SipHash-2-4 for all keys. Doing so makes
+     hash table insertion about 20% slower on 4- and 8-byte keys, 5% slower on
+     64-byte keys, and 10% slower on 256-byte keys on my test computer.
+
+  #define STBDS_REALLOC(context,ptr,size) better_realloc
+  #define STBDS_FREE(context,ptr)         better_free
+
+     These defines only need to be set in the file containing #define STB_DS_IMPLEMENTATION.
+
+     By default stb_ds uses stdlib realloc() and free() for memory management. You can
+     substitute your own functions instead by defining these symbols. You must either
+     define both, or neither. Note that at the moment, 'context' will always be NULL.
+     @TODO add an array/hash initialization function that takes a memory context pointer.
+
+  #define STBDS_UNIT_TESTS
+
+     Defines a function stbds_unit_tests() that checks the functioning of the data structures.
+
+  Note that on older versions of gcc (e.g. 5.x.x) you may need to build with '-std=c++0x'
+     (or equivalentally '-std=c++11') when using anonymous structures as seen on the web
+     page or in STBDS_UNIT_TESTS.
+
+LICENSE
+
+  Placed in the public domain and also MIT licensed.
+  See end of file for detailed license information.
+
+DOCUMENTATION
+
+  Dynamic Arrays
+
+    Non-function interface:
+
+      Declare an empty dynamic array of type T
+        T* foo = NULL;
+
+      Access the i'th item of a dynamic array 'foo' of type T, T* foo:
+        foo[i]
+
+    Functions (actually macros)
+
+      arrfree:
+        void arrfree(T*);
+          Frees the array.
+
+      arrlen:
+        ptrdiff_t arrlen(T*);
+          Returns the number of elements in the array.
+
+      arrlenu:
+        size_t arrlenu(T*);
+          Returns the number of elements in the array as an unsigned type.
+
+      arrpop:
+        T arrpop(T* a)
+          Removes the final element of the array and returns it.
+
+      arrput:
+        T arrput(T* a, T b);
+          Appends the item b to the end of array a. Returns b.
+
+      arrins:
+        T arrins(T* a, int p, T b);
+          Inserts the item b into the middle of array a, into a[p],
+          moving the rest of the array over. Returns b.
+
+      arrinsn:
+        void arrinsn(T* a, int p, int n);
+          Inserts n uninitialized items into array a starting at a[p],
+          moving the rest of the array over.
+
+      arraddnptr:
+        T* arraddnptr(T* a, int n)
+          Appends n uninitialized items onto array at the end.
+          Returns a pointer to the first uninitialized item added.
+
+      arraddnindex:
+        size_t arraddnindex(T* a, int n)
+          Appends n uninitialized items onto array at the end.
+          Returns the index of the first uninitialized item added.
+
+      arrdel:
+        void arrdel(T* a, int p);
+          Deletes the element at a[p], moving the rest of the array over.
+
+      arrdeln:
+        void arrdeln(T* a, int p, int n);
+          Deletes n elements starting at a[p], moving the rest of the array over.
+
+      arrdelswap:
+        void arrdelswap(T* a, int p);
+          Deletes the element at a[p], replacing it with the element from
+          the end of the array. O(1) performance.
+
+      arrsetlen:
+        void arrsetlen(T* a, int n);
+          Changes the length of the array to n. Allocates uninitialized
+          slots at the end if necessary.
+
+      arrsetcap:
+        size_t arrsetcap(T* a, int n);
+          Sets the length of allocated storage to at least n. It will not
+          change the length of the array.
+
+      arrcap:
+        size_t arrcap(T* a);
+          Returns the number of total elements the array can contain without
+          needing to be reallocated.
+
+  Hash maps & String hash maps
+
+    Given T is a structure type: struct { TK key; TV value; }. Note that some
+    functions do not require TV value and can have other fields. For string
+    hash maps, TK must be 'char *'.
+
+    Special interface:
+
+      stbds_rand_seed:
+        void stbds_rand_seed(size_t seed);
+          For security against adversarially chosen data, you should seed the
+          library with a strong random number. Or at least seed it with time().
+
+      stbds_hash_string:
+        size_t stbds_hash_string(char *str, size_t seed);
+          Returns a hash value for a string.
+
+      stbds_hash_bytes:
+        size_t stbds_hash_bytes(void *p, size_t len, size_t seed);
+          These functions hash an arbitrary number of bytes. The function
+          uses a custom hash for 4- and 8-byte data, and a weakened version
+          of SipHash for everything else. On 64-bit platforms you can get
+          specification-compliant SipHash-2-4 on all data by defining
+          STBDS_SIPHASH_2_4, at a significant cost in speed.
+
+    Non-function interface:
+
+      Declare an empty hash map of type T
+        T* foo = NULL;
+
+      Access the i'th entry in a hash table T* foo:
+        foo[i]
+
+    Function interface (actually macros):
+
+      hmfree
+      shfree
+        void hmfree(T*);
+        void shfree(T*);
+          Frees the hashmap and sets the pointer to NULL.
+
+      hmlen
+      shlen
+        ptrdiff_t hmlen(T*)
+        ptrdiff_t shlen(T*)
+          Returns the number of elements in the hashmap.
+
+      hmlenu
+      shlenu
+        size_t hmlenu(T*)
+        size_t shlenu(T*)
+          Returns the number of elements in the hashmap.
+
+      hmgeti
+      shgeti
+      hmgeti_ts
+        ptrdiff_t hmgeti(T*, TK key)
+        ptrdiff_t shgeti(T*, char* key)
+        ptrdiff_t hmgeti_ts(T*, TK key, ptrdiff_t tempvar)
+          Returns the index in the hashmap which has the key 'key', or -1
+          if the key is not present.
+
+      hmget
+      hmget_ts
+      shget
+        TV hmget(T*, TK key)
+        TV shget(T*, char* key)
+        TV hmget_ts(T*, TK key, ptrdiff_t tempvar)
+          Returns the value corresponding to 'key' in the hashmap.
+          The structure must have a 'value' field
+
+      hmgets
+      shgets
+        T hmgets(T*, TK key)
+        T shgets(T*, char* key)
+          Returns the structure corresponding to 'key' in the hashmap.
+
+      hmgetp
+      shgetp
+      hmgetp_ts
+      hmgetp_null
+      shgetp_null
+        T* hmgetp(T*, TK key)
+        T* shgetp(T*, char* key)
+        T* hmgetp_ts(T*, TK key, ptrdiff_t tempvar)
+        T* hmgetp_null(T*, TK key)
+        T* shgetp_null(T*, char *key)
+          Returns a pointer to the structure corresponding to 'key' in
+          the hashmap. Functions ending in "_null" return NULL if the key
+          is not present in the hashmap; the others return a pointer to a
+          structure holding the default value (but not the searched-for key).
+
+      hmdefault
+      shdefault
+        TV hmdefault(T*, TV value)
+        TV shdefault(T*, TV value)
+          Sets the default value for the hashmap, the value which will be
+          returned by hmget/shget if the key is not present.
+
+      hmdefaults
+      shdefaults
+        TV hmdefaults(T*, T item)
+        TV shdefaults(T*, T item)
+          Sets the default struct for the hashmap, the contents which will be
+          returned by hmgets/shgets if the key is not present.
+
+      hmput
+      shput
+        TV hmput(T*, TK key, TV value)
+        TV shput(T*, char* key, TV value)
+          Inserts a <key,value> pair into the hashmap. If the key is already
+          present in the hashmap, updates its value.
+
+      hmputs
+      shputs
+        T hmputs(T*, T item)
+        T shputs(T*, T item)
+          Inserts a struct with T.key into the hashmap. If the struct is already
+          present in the hashmap, updates it.
+
+      hmdel
+      shdel
+        int hmdel(T*, TK key)
+        int shdel(T*, char* key)
+          If 'key' is in the hashmap, deletes its entry and returns 1.
+          Otherwise returns 0.
+
+    Function interface (actually macros) for strings only:
+
+      sh_new_strdup
+        void sh_new_strdup(T*);
+          Overwrites the existing pointer with a newly allocated
+          string hashmap which will automatically allocate and free
+          each string key using realloc/free
+
+      sh_new_arena
+        void sh_new_arena(T*);
+          Overwrites the existing pointer with a newly allocated
+          string hashmap which will automatically allocate each string
+          key to a string arena. Every string key ever used by this
+          hash table remains in the arena until the arena is freed.
+          Additionally, any key which is deleted and reinserted will
+          be allocated multiple times in the string arena.
+
+NOTES
+
+  * These data structures are realloc'd when they grow, and the macro
+    "functions" write to the provided pointer. This means: (a) the pointer
+    must be an lvalue, and (b) the pointer to the data structure is not
+    stable, and you must maintain it the same as you would a realloc'd
+    pointer. For example, if you pass a pointer to a dynamic array to a
+    function which updates it, the function must return back the new
+    pointer to the caller. This is the price of trying to do this in C.
+
+  * The following are the only functions that are thread-safe on a single data
+    structure, i.e. can be run in multiple threads simultaneously on the same
+    data structure
+        hmlen        shlen
+        hmlenu       shlenu
+        hmget_ts     shget_ts
+        hmgeti_ts    shgeti_ts
+        hmgets_ts    shgets_ts
+
+  * You iterate over the contents of a dynamic array and a hashmap in exactly
+    the same way, using arrlen/hmlen/shlen:
+
+      for (i=0; i < arrlen(foo); ++i)
+         ... foo[i] ...
+
+  * All operations except arrins/arrdel are O(1) amortized, but individual
+    operations can be slow, so these data structures may not be suitable
+    for real time use. Dynamic arrays double in capacity as needed, so
+    elements are copied an average of once. Hash tables double/halve
+    their size as needed, with appropriate hysteresis to maintain O(1)
+    performance.
+
+NOTES - DYNAMIC ARRAY
+
+  * If you know how long a dynamic array is going to be in advance, you can avoid
+    extra memory allocations by using arrsetlen to allocate it to that length in
+    advance and use foo[n] while filling it out, or arrsetcap to allocate the memory
+    for that length and use arrput/arrpush as normal.
+
+  * Unlike some other versions of the dynamic array, this version should
+    be safe to use with strict-aliasing optimizations.
+
+NOTES - HASH MAP
+
+  * For compilers other than GCC and clang (e.g. Visual Studio), for hmput/hmget/hmdel
+    and variants, the key must be an lvalue (so the macro can take the address of it).
+    Extensions are used that eliminate this requirement if you're using C99 and later
+    in GCC or clang, or if you're using C++ in GCC. But note that this can make your
+    code less portable.
+
+  * To test for presence of a key in a hashmap, just do 'hmgeti(foo,key) >= 0'.
+
+  * The iteration order of your data in the hashmap is determined solely by the
+    order of insertions and deletions. In particular, if you never delete, new
+    keys are always added at the end of the array. This will be consistent
+    across all platforms and versions of the library. However, you should not
+    attempt to serialize the internal hash table, as the hash is not consistent
+    between different platforms, and may change with future versions of the library.
+
+  * Use sh_new_arena() for string hashmaps that you never delete from. Initialize
+    with NULL if you're managing the memory for your strings, or your strings are
+    never freed (at least until the hashmap is freed). Otherwise, use sh_new_strdup().
+    @TODO: make an arena variant that garbage collects the strings with a trivial
+    copy collector into a new arena whenever the table shrinks / rebuilds. Since
+    current arena recommendation is to only use arena if it never deletes, then
+    this can just replace current arena implementation.
+
+  * If adversarial input is a serious concern and you're on a 64-bit platform,
+    enable STBDS_SIPHASH_2_4 (see the 'Compile-time options' section), and pass
+    a strong random number to stbds_rand_seed.
+
+  * The default value for the hash table is stored in foo[-1], so if you
+    use code like 'hmget(T,k)->value = 5' you can accidentally overwrite
+    the value stored by hmdefault if 'k' is not present.
+
+CREDITS
+
+  Sean Barrett -- library, idea for dynamic array API/implementation
+  Per Vognsen  -- idea for hash table API/implementation
+  Rafael Sachetto -- arrpop()
+  github:HeroicKatora -- arraddn() reworking
+
+  Bugfixes:
+    Andy Durdin
+    Shane Liesegang
+    Vinh Truong
+    Andreas Molzer
+    github:hashitaku
+    github:srdjanstipic
+    Macoy Madson
+    Andreas Vennstrom
+    Tobias Mansfield-Williams
+*/
+
+#ifdef STBDS_UNIT_TESTS
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+
+#ifndef INCLUDE_STB_DS_H
+#define INCLUDE_STB_DS_H
+
+#include <stddef.h>
+#include <string.h>
+
+#ifndef STBDS_NO_SHORT_NAMES
+#define arrlen      stbds_arrlen
+#define arrlenu     stbds_arrlenu
+#define arrput      stbds_arrput
+#define arrpush     stbds_arrput
+#define arrpop      stbds_arrpop
+#define arrfree     stbds_arrfree
+#define arraddn     stbds_arraddn // deprecated, use one of the following instead:
+#define arraddnptr  stbds_arraddnptr
+#define arraddnindex stbds_arraddnindex
+#define arrsetlen   stbds_arrsetlen
+#define arrlast     stbds_arrlast
+#define arrins      stbds_arrins
+#define arrinsn     stbds_arrinsn
+#define arrdel      stbds_arrdel
+#define arrdeln     stbds_arrdeln
+#define arrdelswap  stbds_arrdelswap
+#define arrcap      stbds_arrcap
+#define arrsetcap   stbds_arrsetcap
+
+#define hmput       stbds_hmput
+#define hmputs      stbds_hmputs
+#define hmget       stbds_hmget
+#define hmget_ts    stbds_hmget_ts
+#define hmgets      stbds_hmgets
+#define hmgetp      stbds_hmgetp
+#define hmgetp_ts   stbds_hmgetp_ts
+#define hmgetp_null stbds_hmgetp_null
+#define hmgeti      stbds_hmgeti
+#define hmgeti_ts   stbds_hmgeti_ts
+#define hmdel       stbds_hmdel
+#define hmlen       stbds_hmlen
+#define hmlenu      stbds_hmlenu
+#define hmfree      stbds_hmfree
+#define hmdefault   stbds_hmdefault
+#define hmdefaults  stbds_hmdefaults
+
+#define shput       stbds_shput
+#define shputi      stbds_shputi
+#define shputs      stbds_shputs
+#define shget       stbds_shget
+#define shgeti      stbds_shgeti
+#define shgets      stbds_shgets
+#define shgetp      stbds_shgetp
+#define shgetp_null stbds_shgetp_null
+#define shdel       stbds_shdel
+#define shlen       stbds_shlen
+#define shlenu      stbds_shlenu
+#define shfree      stbds_shfree
+#define shdefault   stbds_shdefault
+#define shdefaults  stbds_shdefaults
+#define sh_new_arena  stbds_sh_new_arena
+#define sh_new_strdup stbds_sh_new_strdup
+
+#define stralloc    stbds_stralloc
+#define strreset    stbds_strreset
+#endif
+
+#if defined(STBDS_REALLOC) && !defined(STBDS_FREE) || !defined(STBDS_REALLOC) && defined(STBDS_FREE)
+#error "You must define both STBDS_REALLOC and STBDS_FREE, or neither."
+#endif
+#if !defined(STBDS_REALLOC) && !defined(STBDS_FREE)
+#include <stdlib.h>
+#define STBDS_REALLOC(c,p,s) realloc(p,s)
+#define STBDS_FREE(c,p)      free(p)
+#endif
+
+#ifdef _MSC_VER
+#define STBDS_NOTUSED(v)  (void)(v)
+#else
+#define STBDS_NOTUSED(v)  (void)sizeof(v)
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// for security against attackers, seed the library with a random number, at least time() but stronger is better
+extern void stbds_rand_seed(size_t seed);
+
+// these are the hash functions used internally if you want to test them or use them for other purposes
+extern size_t stbds_hash_bytes(void *p, size_t len, size_t seed);
+extern size_t stbds_hash_string(char *str, size_t seed);
+
+// this is a simple string arena allocator, initialize with e.g. 'stbds_string_arena my_arena={0}'.
+typedef struct stbds_string_arena stbds_string_arena;
+extern char * stbds_stralloc(stbds_string_arena *a, char *str);
+extern void   stbds_strreset(stbds_string_arena *a);
+
+// have to #define STBDS_UNIT_TESTS to call this
+extern void stbds_unit_tests(void);
+
+///////////////
+//
+// Everything below here is implementation details
+//
+
+extern void * stbds_arrgrowf(void *a, size_t elemsize, size_t addlen, size_t min_cap);
+extern void   stbds_arrfreef(void *a);
+extern void   stbds_hmfree_func(void *p, size_t elemsize);
+extern void * stbds_hmget_key(void *a, size_t elemsize, void *key, size_t keysize, int mode);
+extern void * stbds_hmget_key_ts(void *a, size_t elemsize, void *key, size_t keysize, ptrdiff_t *temp, int mode);
+extern void * stbds_hmput_default(void *a, size_t elemsize);
+extern void * stbds_hmput_key(void *a, size_t elemsize, void *key, size_t keysize, int mode);
+extern void * stbds_hmdel_key(void *a, size_t elemsize, void *key, size_t keysize, size_t keyoffset, int mode);
+extern void * stbds_shmode_func(size_t elemsize, int mode);
+
+#ifdef __cplusplus
+}
+#endif
+
+#if defined(__GNUC__) || defined(__clang__)
+#define STBDS_HAS_TYPEOF
+#ifdef __cplusplus
+//#define STBDS_HAS_LITERAL_ARRAY  // this is currently broken for clang
+#endif
+#endif
+
+#if !defined(__cplusplus)
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+#define STBDS_HAS_LITERAL_ARRAY
+#endif
+#endif
+
+// this macro takes the address of the argument, but on gcc/clang can accept rvalues
+#if defined(STBDS_HAS_LITERAL_ARRAY) && defined(STBDS_HAS_TYPEOF)
+  #if __clang__
+  #define STBDS_ADDRESSOF(typevar, value)     ((__typeof__(typevar)[1]){value}) // literal array decays to pointer to value
+  #else
+  #define STBDS_ADDRESSOF(typevar, value)     ((typeof(typevar)[1]){value}) // literal array decays to pointer to value
+  #endif
+#else
+#define STBDS_ADDRESSOF(typevar, value)     &(value)
+#endif
+
+#define STBDS_OFFSETOF(var,field)           ((char *) &(var)->field - (char *) (var))
+
+#define stbds_header(t)  ((stbds_array_header *) (t) - 1)
+#define stbds_temp(t)    stbds_header(t)->temp
+#define stbds_temp_key(t) (*(char **) stbds_header(t)->hash_table)
+
+#define stbds_arrsetcap(a,n)   (stbds_arrgrow(a,0,n))
+#define stbds_arrsetlen(a,n)   ((stbds_arrcap(a) < (size_t) (n) ? stbds_arrsetcap((a),(size_t)(n)),0 : 0), (a) ? stbds_header(a)->length = (size_t) (n) : 0)
+#define stbds_arrcap(a)        ((a) ? stbds_header(a)->capacity : 0)
+#define stbds_arrlen(a)        ((a) ? (ptrdiff_t) stbds_header(a)->length : 0)
+#define stbds_arrlenu(a)       ((a) ?             stbds_header(a)->length : 0)
+#define stbds_arrput(a,v)      (stbds_arrmaybegrow(a,1), (a)[stbds_header(a)->length++] = (v))
+#define stbds_arrpush          stbds_arrput  // synonym
+#define stbds_arrpop(a)        (stbds_header(a)->length--, (a)[stbds_header(a)->length])
+#define stbds_arraddn(a,n)     ((void)(stbds_arraddnindex(a, n)))    // deprecated, use one of the following instead:
+#define stbds_arraddnptr(a,n)  (stbds_arrmaybegrow(a,n), (n) ? (stbds_header(a)->length += (n), &(a)[stbds_header(a)->length-(n)]) : (a))
+#define stbds_arraddnindex(a,n)(stbds_arrmaybegrow(a,n), (n) ? (stbds_header(a)->length += (n), stbds_header(a)->length-(n)) : stbds_arrlen(a))
+#define stbds_arraddnoff       stbds_arraddnindex
+#define stbds_arrlast(a)       ((a)[stbds_header(a)->length-1])
+#define stbds_arrfree(a)       ((void) ((a) ? STBDS_FREE(NULL,stbds_header(a)) : (void)0), (a)=NULL)
+#define stbds_arrdel(a,i)      stbds_arrdeln(a,i,1)
+#define stbds_arrdeln(a,i,n)   (memmove(&(a)[i], &(a)[(i)+(n)], sizeof *(a) * (stbds_header(a)->length-(n)-(i))), stbds_header(a)->length -= (n))
+#define stbds_arrdelswap(a,i)  ((a)[i] = stbds_arrlast(a), stbds_header(a)->length -= 1)
+#define stbds_arrinsn(a,i,n)   (stbds_arraddn((a),(n)), memmove(&(a)[(i)+(n)], &(a)[i], sizeof *(a) * (stbds_header(a)->length-(n)-(i))))
+#define stbds_arrins(a,i,v)    (stbds_arrinsn((a),(i),1), (a)[i]=(v))
+
+#define stbds_arrmaybegrow(a,n)  ((!(a) || stbds_header(a)->length + (n) > stbds_header(a)->capacity) \
+                                  ? (stbds_arrgrow(a,n,0),0) : 0)
+
+#define stbds_arrgrow(a,b,c)   ((a) = stbds_arrgrowf_wrapper((a), sizeof *(a), (b), (c)))
+
+#define stbds_hmput(t, k, v) \
+    ((t) = stbds_hmput_key_wrapper((t), sizeof *(t), (void*) STBDS_ADDRESSOF((t)->key, (k)), sizeof (t)->key, 0),   \
+     (t)[stbds_temp((t)-1)].key = (k),    \
+     (t)[stbds_temp((t)-1)].value = (v))
+
+#define stbds_hmputs(t, s) \
+    ((t) = stbds_hmput_key_wrapper((t), sizeof *(t), &(s).key, sizeof (s).key, STBDS_HM_BINARY), \
+     (t)[stbds_temp((t)-1)] = (s))
+
+#define stbds_hmgeti(t,k) \
+    ((t) = stbds_hmget_key_wrapper((t), sizeof *(t), (void*) STBDS_ADDRESSOF((t)->key, (k)), sizeof (t)->key, STBDS_HM_BINARY), \
+      stbds_temp((t)-1))
+
+#define stbds_hmgeti_ts(t,k,temp) \
+    ((t) = stbds_hmget_key_ts_wrapper((t), sizeof *(t), (void*) STBDS_ADDRESSOF((t)->key, (k)), sizeof (t)->key, &(temp), STBDS_HM_BINARY), \
+      (temp))
+
+#define stbds_hmgetp(t, k) \
+    ((void) stbds_hmgeti(t,k), &(t)[stbds_temp((t)-1)])
+
+#define stbds_hmgetp_ts(t, k, temp) \
+    ((void) stbds_hmgeti_ts(t,k,temp), &(t)[temp])
+
+#define stbds_hmdel(t,k) \
+    (((t) = stbds_hmdel_key_wrapper((t),sizeof *(t), (void*) STBDS_ADDRESSOF((t)->key, (k)), sizeof (t)->key, STBDS_OFFSETOF((t),key), STBDS_HM_BINARY)),(t)?stbds_temp((t)-1):0)
+
+#define stbds_hmdefault(t, v) \
+    ((t) = stbds_hmput_default_wrapper((t), sizeof *(t)), (t)[-1].value = (v))
+
+#define stbds_hmdefaults(t, s) \
+    ((t) = stbds_hmput_default_wrapper((t), sizeof *(t)), (t)[-1] = (s))
+
+#define stbds_hmfree(p)        \
+    ((void) ((p) != NULL ? stbds_hmfree_func((p)-1,sizeof*(p)),0 : 0),(p)=NULL)
+
+#define stbds_hmgets(t, k)    (*stbds_hmgetp(t,k))
+#define stbds_hmget(t, k)     (stbds_hmgetp(t,k)->value)
+#define stbds_hmget_ts(t, k, temp)  (stbds_hmgetp_ts(t,k,temp)->value)
+#define stbds_hmlen(t)        ((t) ? (ptrdiff_t) stbds_header((t)-1)->length-1 : 0)
+#define stbds_hmlenu(t)       ((t) ?             stbds_header((t)-1)->length-1 : 0)
+#define stbds_hmgetp_null(t,k)  (stbds_hmgeti(t,k) == -1 ? NULL : &(t)[stbds_temp((t)-1)])
+
+#define stbds_shput(t, k, v) \
+    ((t) = stbds_hmput_key_wrapper((t), sizeof *(t), (void*) (k), sizeof (t)->key, STBDS_HM_STRING),   \
+     (t)[stbds_temp((t)-1)].value = (v))
+
+#define stbds_shputi(t, k, v) \
+    ((t) = stbds_hmput_key_wrapper((t), sizeof *(t), (void*) (k), sizeof (t)->key, STBDS_HM_STRING),   \
+     (t)[stbds_temp((t)-1)].value = (v), stbds_temp((t)-1))
+
+#define stbds_shputs(t, s) \
+    ((t) = stbds_hmput_key_wrapper((t), sizeof *(t), (void*) (s).key, sizeof (s).key, STBDS_HM_STRING), \
+     (t)[stbds_temp((t)-1)] = (s), \
+     (t)[stbds_temp((t)-1)].key = stbds_temp_key((t)-1)) // above line overwrites whole structure, so must rewrite key here if it was allocated internally
+
+#define stbds_pshput(t, p) \
+    ((t) = stbds_hmput_key_wrapper((t), sizeof *(t), (void*) (p)->key, sizeof (p)->key, STBDS_HM_PTR_TO_STRING), \
+     (t)[stbds_temp((t)-1)] = (p))
+
+#define stbds_shgeti(t,k) \
+     ((t) = stbds_hmget_key_wrapper((t), sizeof *(t), (void*) (k), sizeof (t)->key, STBDS_HM_STRING), \
+      stbds_temp((t)-1))
+
+#define stbds_pshgeti(t,k) \
+     ((t) = stbds_hmget_key_wrapper((t), sizeof *(t), (void*) (k), sizeof (*(t))->key, STBDS_HM_PTR_TO_STRING), \
+      stbds_temp((t)-1))
+
+#define stbds_shgetp(t, k) \
+    ((void) stbds_shgeti(t,k), &(t)[stbds_temp((t)-1)])
+
+#define stbds_pshget(t, k) \
+    ((void) stbds_pshgeti(t,k), (t)[stbds_temp((t)-1)])
+
+#define stbds_shdel(t,k) \
+    (((t) = stbds_hmdel_key_wrapper((t),sizeof *(t), (void*) (k), sizeof (t)->key, STBDS_OFFSETOF((t),key), STBDS_HM_STRING)),(t)?stbds_temp((t)-1):0)
+#define stbds_pshdel(t,k) \
+    (((t) = stbds_hmdel_key_wrapper((t),sizeof *(t), (void*) (k), sizeof (*(t))->key, STBDS_OFFSETOF(*(t),key), STBDS_HM_PTR_TO_STRING)),(t)?stbds_temp((t)-1):0)
+
+#define stbds_sh_new_arena(t)  \
+    ((t) = stbds_shmode_func_wrapper(t, sizeof *(t), STBDS_SH_ARENA))
+#define stbds_sh_new_strdup(t) \
+    ((t) = stbds_shmode_func_wrapper(t, sizeof *(t), STBDS_SH_STRDUP))
+
+#define stbds_shdefault(t, v)  stbds_hmdefault(t,v)
+#define stbds_shdefaults(t, s) stbds_hmdefaults(t,s)
+
+#define stbds_shfree       stbds_hmfree
+#define stbds_shlenu       stbds_hmlenu
+
+#define stbds_shgets(t, k) (*stbds_shgetp(t,k))
+#define stbds_shget(t, k)  (stbds_shgetp(t,k)->value)
+#define stbds_shgetp_null(t,k)  (stbds_shgeti(t,k) == -1 ? NULL : &(t)[stbds_temp((t)-1)])
+#define stbds_shlen        stbds_hmlen
+
+typedef struct
+{
+  size_t      length;
+  size_t      capacity;
+  void      * hash_table;
+  ptrdiff_t   temp;
+} stbds_array_header;
+
+typedef struct stbds_string_block
+{
+  struct stbds_string_block *next;
+  char storage[8];
+} stbds_string_block;
+
+struct stbds_string_arena
+{
+  stbds_string_block *storage;
+  size_t remaining;
+  unsigned char block;
+  unsigned char mode;  // this isn't used by the string arena itself
+};
+
+#define STBDS_HM_BINARY         0
+#define STBDS_HM_STRING         1
+
+enum
+{
+   STBDS_SH_NONE,
+   STBDS_SH_DEFAULT,
+   STBDS_SH_STRDUP,
+   STBDS_SH_ARENA
+};
+
+#ifdef __cplusplus
+// in C we use implicit assignment from these void*-returning functions to T*.
+// in C++ these templates make the same code work
+template<class T> static T * stbds_arrgrowf_wrapper(T *a, size_t elemsize, size_t addlen, size_t min_cap) {
+  return (T*)stbds_arrgrowf((void *)a, elemsize, addlen, min_cap);
+}
+template<class T> static T * stbds_hmget_key_wrapper(T *a, size_t elemsize, void *key, size_t keysize, int mode) {
+  return (T*)stbds_hmget_key((void*)a, elemsize, key, keysize, mode);
+}
+template<class T> static T * stbds_hmget_key_ts_wrapper(T *a, size_t elemsize, void *key, size_t keysize, ptrdiff_t *temp, int mode) {
+  return (T*)stbds_hmget_key_ts((void*)a, elemsize, key, keysize, temp, mode);
+}
+template<class T> static T * stbds_hmput_default_wrapper(T *a, size_t elemsize) {
+  return (T*)stbds_hmput_default((void *)a, elemsize);
+}
+template<class T> static T * stbds_hmput_key_wrapper(T *a, size_t elemsize, void *key, size_t keysize, int mode) {
+  return (T*)stbds_hmput_key((void*)a, elemsize, key, keysize, mode);
+}
+template<class T> static T * stbds_hmdel_key_wrapper(T *a, size_t elemsize, void *key, size_t keysize, size_t keyoffset, int mode){
+  return (T*)stbds_hmdel_key((void*)a, elemsize, key, keysize, keyoffset, mode);
+}
+template<class T> static T * stbds_shmode_func_wrapper(T *, size_t elemsize, int mode) {
+  return (T*)stbds_shmode_func(elemsize, mode);
+}
+#else
+#define stbds_arrgrowf_wrapper            stbds_arrgrowf
+#define stbds_hmget_key_wrapper           stbds_hmget_key
+#define stbds_hmget_key_ts_wrapper        stbds_hmget_key_ts
+#define stbds_hmput_default_wrapper       stbds_hmput_default
+#define stbds_hmput_key_wrapper           stbds_hmput_key
+#define stbds_hmdel_key_wrapper           stbds_hmdel_key
+#define stbds_shmode_func_wrapper(t,e,m)  stbds_shmode_func(e,m)
+#endif
+
+#endif // INCLUDE_STB_DS_H
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//   IMPLEMENTATION
+//
+
+#ifdef STB_DS_IMPLEMENTATION
+#include <assert.h>
+#include <string.h>
+
+#ifndef STBDS_ASSERT
+#define STBDS_ASSERT_WAS_UNDEFINED
+#define STBDS_ASSERT(x)   ((void) 0)
+#endif
+
+#ifdef STBDS_STATISTICS
+#define STBDS_STATS(x)   x
+size_t stbds_array_grow;
+size_t stbds_hash_grow;
+size_t stbds_hash_shrink;
+size_t stbds_hash_rebuild;
+size_t stbds_hash_probes;
+size_t stbds_hash_alloc;
+size_t stbds_rehash_probes;
+size_t stbds_rehash_items;
+#else
+#define STBDS_STATS(x)
+#endif
+
+//
+// stbds_arr implementation
+//
+
+//int *prev_allocs[65536];
+//int num_prev;
+
+void *stbds_arrgrowf(void *a, size_t elemsize, size_t addlen, size_t min_cap)
+{
+  stbds_array_header temp={0}; // force debugging
+  void *b;
+  size_t min_len = stbds_arrlen(a) + addlen;
+  (void) sizeof(temp);
+
+  // compute the minimum capacity needed
+  if (min_len > min_cap)
+    min_cap = min_len;
+
+  if (min_cap <= stbds_arrcap(a))
+    return a;
+
+  // increase needed capacity to guarantee O(1) amortized
+  if (min_cap < 2 * stbds_arrcap(a))
+    min_cap = 2 * stbds_arrcap(a);
+  else if (min_cap < 4)
+    min_cap = 4;
+
+  //if (num_prev < 65536) if (a) prev_allocs[num_prev++] = (int *) ((char *) a+1);
+  //if (num_prev == 2201)
+  //  num_prev = num_prev;
+  b = STBDS_REALLOC(NULL, (a) ? stbds_header(a) : 0, elemsize * min_cap + sizeof(stbds_array_header));
+  //if (num_prev < 65536) prev_allocs[num_prev++] = (int *) (char *) b;
+  b = (char *) b + sizeof(stbds_array_header);
+  if (a == NULL) {
+    stbds_header(b)->length = 0;
+    stbds_header(b)->hash_table = 0;
+    stbds_header(b)->temp = 0;
+  } else {
+    STBDS_STATS(++stbds_array_grow);
+  }
+  stbds_header(b)->capacity = min_cap;
+
+  return b;
+}
+
+void stbds_arrfreef(void *a)
+{
+  STBDS_FREE(NULL, stbds_header(a));
+}
+
+//
+// stbds_hm hash table implementation
+//
+
+#ifdef STBDS_INTERNAL_SMALL_BUCKET
+#define STBDS_BUCKET_LENGTH      4
+#else
+#define STBDS_BUCKET_LENGTH      8
+#endif
+
+#define STBDS_BUCKET_SHIFT      (STBDS_BUCKET_LENGTH == 8 ? 3 : 2)
+#define STBDS_BUCKET_MASK       (STBDS_BUCKET_LENGTH-1)
+#define STBDS_CACHE_LINE_SIZE   64
+
+#define STBDS_ALIGN_FWD(n,a)   (((n) + (a) - 1) & ~((a)-1))
+
+typedef struct
+{
+   size_t    hash [STBDS_BUCKET_LENGTH];
+   ptrdiff_t index[STBDS_BUCKET_LENGTH];
+} stbds_hash_bucket; // in 32-bit, this is one 64-byte cache line; in 64-bit, each array is one 64-byte cache line
+
+typedef struct
+{
+  char * temp_key; // this MUST be the first field of the hash table
+  size_t slot_count;
+  size_t used_count;
+  size_t used_count_threshold;
+  size_t used_count_shrink_threshold;
+  size_t tombstone_count;
+  size_t tombstone_count_threshold;
+  size_t seed;
+  size_t slot_count_log2;
+  stbds_string_arena string;
+  stbds_hash_bucket *storage; // not a separate allocation, just 64-byte aligned storage after this struct
+} stbds_hash_index;
+
+#define STBDS_INDEX_EMPTY    -1
+#define STBDS_INDEX_DELETED  -2
+#define STBDS_INDEX_IN_USE(x)  ((x) >= 0)
+
+#define STBDS_HASH_EMPTY      0
+#define STBDS_HASH_DELETED    1
+
+static size_t stbds_hash_seed=0x31415926;
+
+void stbds_rand_seed(size_t seed)
+{
+  stbds_hash_seed = seed;
+}
+
+#define stbds_load_32_or_64(var, temp, v32, v64_hi, v64_lo)                                          \
+  temp = v64_lo ^ v32, temp <<= 16, temp <<= 16, temp >>= 16, temp >>= 16, /* discard if 32-bit */   \
+  var = v64_hi, var <<= 16, var <<= 16,                                    /* discard if 32-bit */   \
+  var ^= temp ^ v32
+
+#define STBDS_SIZE_T_BITS           ((sizeof (size_t)) * 8)
+
+static size_t stbds_probe_position(size_t hash, size_t slot_count, size_t slot_log2)
+{
+  size_t pos;
+  STBDS_NOTUSED(slot_log2);
+  pos = hash & (slot_count-1);
+  #ifdef STBDS_INTERNAL_BUCKET_START
+  pos &= ~STBDS_BUCKET_MASK;
+  #endif
+  return pos;
+}
+
+static size_t stbds_log2(size_t slot_count)
+{
+  size_t n=0;
+  while (slot_count > 1) {
+    slot_count >>= 1;
+    ++n;
+  }
+  return n;
+}
+
+static stbds_hash_index *stbds_make_hash_index(size_t slot_count, stbds_hash_index *ot)
+{
+  stbds_hash_index *t;
+  t = (stbds_hash_index *) STBDS_REALLOC(NULL,0,(slot_count >> STBDS_BUCKET_SHIFT) * sizeof(stbds_hash_bucket) + sizeof(stbds_hash_index) + STBDS_CACHE_LINE_SIZE-1);
+  t->storage = (stbds_hash_bucket *) STBDS_ALIGN_FWD((size_t) (t+1), STBDS_CACHE_LINE_SIZE);
+  t->slot_count = slot_count;
+  t->slot_count_log2 = stbds_log2(slot_count);
+  t->tombstone_count = 0;
+  t->used_count = 0;
+
+  #if 0 // A1
+  t->used_count_threshold        = slot_count*12/16; // if 12/16th of table is occupied, grow
+  t->tombstone_count_threshold   = slot_count* 2/16; // if tombstones are 2/16th of table, rebuild
+  t->used_count_shrink_threshold = slot_count* 4/16; // if table is only 4/16th full, shrink
+  #elif 1 // A2
+  //t->used_count_threshold        = slot_count*12/16; // if 12/16th of table is occupied, grow
+  //t->tombstone_count_threshold   = slot_count* 3/16; // if tombstones are 3/16th of table, rebuild
+  //t->used_count_shrink_threshold = slot_count* 4/16; // if table is only 4/16th full, shrink
+
+  // compute without overflowing
+  t->used_count_threshold        = slot_count - (slot_count>>2);
+  t->tombstone_count_threshold   = (slot_count>>3) + (slot_count>>4);
+  t->used_count_shrink_threshold = slot_count >> 2;
+
+  #elif 0 // B1
+  t->used_count_threshold        = slot_count*13/16; // if 13/16th of table is occupied, grow
+  t->tombstone_count_threshold   = slot_count* 2/16; // if tombstones are 2/16th of table, rebuild
+  t->used_count_shrink_threshold = slot_count* 5/16; // if table is only 5/16th full, shrink
+  #else // C1
+  t->used_count_threshold        = slot_count*14/16; // if 14/16th of table is occupied, grow
+  t->tombstone_count_threshold   = slot_count* 2/16; // if tombstones are 2/16th of table, rebuild
+  t->used_count_shrink_threshold = slot_count* 6/16; // if table is only 6/16th full, shrink
+  #endif
+  // Following statistics were measured on a Core i7-6700 @ 4.00Ghz, compiled with clang 7.0.1 -O2
+    // Note that the larger tables have high variance as they were run fewer times
+  //     A1            A2          B1           C1
+  //    0.10ms :     0.10ms :     0.10ms :     0.11ms :      2,000 inserts creating 2K table
+  //    0.96ms :     0.95ms :     0.97ms :     1.04ms :     20,000 inserts creating 20K table
+  //   14.48ms :    14.46ms :    10.63ms :    11.00ms :    200,000 inserts creating 200K table
+  //  195.74ms :   196.35ms :   203.69ms :   214.92ms :  2,000,000 inserts creating 2M table
+  // 2193.88ms :  2209.22ms :  2285.54ms :  2437.17ms : 20,000,000 inserts creating 20M table
+  //   65.27ms :    53.77ms :    65.33ms :    65.47ms : 500,000 inserts & deletes in 2K table
+  //   72.78ms :    62.45ms :    71.95ms :    72.85ms : 500,000 inserts & deletes in 20K table
+  //   89.47ms :    77.72ms :    96.49ms :    96.75ms : 500,000 inserts & deletes in 200K table
+  //   97.58ms :    98.14ms :    97.18ms :    97.53ms : 500,000 inserts & deletes in 2M table
+  //  118.61ms :   119.62ms :   120.16ms :   118.86ms : 500,000 inserts & deletes in 20M table
+  //  192.11ms :   194.39ms :   196.38ms :   195.73ms : 500,000 inserts & deletes in 200M table
+
+  if (slot_count <= STBDS_BUCKET_LENGTH)
+    t->used_count_shrink_threshold = 0;
+  // to avoid infinite loop, we need to guarantee that at least one slot is empty and will terminate probes
+  STBDS_ASSERT(t->used_count_threshold + t->tombstone_count_threshold < t->slot_count);
+  STBDS_STATS(++stbds_hash_alloc);
+  if (ot) {
+    t->string = ot->string;
+    // reuse old seed so we can reuse old hashes so below "copy out old data" doesn't do any hashing
+    t->seed = ot->seed;
+  } else {
+    size_t a,b,temp;
+    memset(&t->string, 0, sizeof(t->string));
+    t->seed = stbds_hash_seed;
+    // LCG
+    // in 32-bit, a =          2147001325   b =  715136305
+    // in 64-bit, a = 2862933555777941757   b = 3037000493
+    stbds_load_32_or_64(a,temp, 2147001325, 0x27bb2ee6, 0x87b0b0fd);
+    stbds_load_32_or_64(b,temp,  715136305,          0, 0xb504f32d);
+    stbds_hash_seed = stbds_hash_seed  * a + b;
+  }
+
+  {
+    size_t i,j;
+    for (i=0; i < slot_count >> STBDS_BUCKET_SHIFT; ++i) {
+      stbds_hash_bucket *b = &t->storage[i];
+      for (j=0; j < STBDS_BUCKET_LENGTH; ++j)
+        b->hash[j] = STBDS_HASH_EMPTY;
+      for (j=0; j < STBDS_BUCKET_LENGTH; ++j)
+        b->index[j] = STBDS_INDEX_EMPTY;
+    }
+  }
+
+  // copy out the old data, if any
+  if (ot) {
+    size_t i,j;
+    t->used_count = ot->used_count;
+    for (i=0; i < ot->slot_count >> STBDS_BUCKET_SHIFT; ++i) {
+      stbds_hash_bucket *ob = &ot->storage[i];
+      for (j=0; j < STBDS_BUCKET_LENGTH; ++j) {
+        if (STBDS_INDEX_IN_USE(ob->index[j])) {
+          size_t hash = ob->hash[j];
+          size_t pos = stbds_probe_position(hash, t->slot_count, t->slot_count_log2);
+          size_t step = STBDS_BUCKET_LENGTH;
+          STBDS_STATS(++stbds_rehash_items);
+          for (;;) {
+            size_t limit,z;
+            stbds_hash_bucket *bucket;
+            bucket = &t->storage[pos >> STBDS_BUCKET_SHIFT];
+            STBDS_STATS(++stbds_rehash_probes);
+
+            for (z=pos & STBDS_BUCKET_MASK; z < STBDS_BUCKET_LENGTH; ++z) {
+              if (bucket->hash[z] == 0) {
+                bucket->hash[z] = hash;
+                bucket->index[z] = ob->index[j];
+                goto done;
+              }
+            }
+
+            limit = pos & STBDS_BUCKET_MASK;
+            for (z = 0; z < limit; ++z) {
+              if (bucket->hash[z] == 0) {
+                bucket->hash[z] = hash;
+                bucket->index[z] = ob->index[j];
+                goto done;
+              }
+            }
+
+            pos += step;                  // quadratic probing
+            step += STBDS_BUCKET_LENGTH;
+            pos &= (t->slot_count-1);
+          }
+        }
+       done:
+        ;
+      }
+    }
+  }
+
+  return t;
+}
+
+#define STBDS_ROTATE_LEFT(val, n)   (((val) << (n)) | ((val) >> (STBDS_SIZE_T_BITS - (n))))
+#define STBDS_ROTATE_RIGHT(val, n)  (((val) >> (n)) | ((val) << (STBDS_SIZE_T_BITS - (n))))
+
+size_t stbds_hash_string(char *str, size_t seed)
+{
+  size_t hash = seed;
+  while (*str)
+     hash = STBDS_ROTATE_LEFT(hash, 9) + (unsigned char) *str++;
+
+  // Thomas Wang 64-to-32 bit mix function, hopefully also works in 32 bits
+  hash ^= seed;
+  hash = (~hash) + (hash << 18);
+  hash ^= hash ^ STBDS_ROTATE_RIGHT(hash,31);
+  hash = hash * 21;
+  hash ^= hash ^ STBDS_ROTATE_RIGHT(hash,11);
+  hash += (hash << 6);
+  hash ^= STBDS_ROTATE_RIGHT(hash,22);
+  return hash+seed;
+}
+
+#ifdef STBDS_SIPHASH_2_4
+#define STBDS_SIPHASH_C_ROUNDS 2
+#define STBDS_SIPHASH_D_ROUNDS 4
+typedef int STBDS_SIPHASH_2_4_can_only_be_used_in_64_bit_builds[sizeof(size_t) == 8 ? 1 : -1];
+#endif
+
+#ifndef STBDS_SIPHASH_C_ROUNDS
+#define STBDS_SIPHASH_C_ROUNDS 1
+#endif
+#ifndef STBDS_SIPHASH_D_ROUNDS
+#define STBDS_SIPHASH_D_ROUNDS 1
+#endif
+
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable:4127) // conditional expression is constant, for do..while(0) and sizeof()==
+#endif
+
+static size_t stbds_siphash_bytes(void *p, size_t len, size_t seed)
+{
+  unsigned char *d = (unsigned char *) p;
+  size_t i,j;
+  size_t v0,v1,v2,v3, data;
+
+  // hash that works on 32- or 64-bit registers without knowing which we have
+  // (computes different results on 32-bit and 64-bit platform)
+  // derived from siphash, but on 32-bit platforms very different as it uses 4 32-bit state not 4 64-bit
+  v0 = ((((size_t) 0x736f6d65 << 16) << 16) + 0x70736575) ^  seed;
+  v1 = ((((size_t) 0x646f7261 << 16) << 16) + 0x6e646f6d) ^ ~seed;
+  v2 = ((((size_t) 0x6c796765 << 16) << 16) + 0x6e657261) ^  seed;
+  v3 = ((((size_t) 0x74656462 << 16) << 16) + 0x79746573) ^ ~seed;
+
+  #ifdef STBDS_TEST_SIPHASH_2_4
+  // hardcoded with key material in the siphash test vectors
+  v0 ^= 0x0706050403020100ull ^  seed;
+  v1 ^= 0x0f0e0d0c0b0a0908ull ^ ~seed;
+  v2 ^= 0x0706050403020100ull ^  seed;
+  v3 ^= 0x0f0e0d0c0b0a0908ull ^ ~seed;
+  #endif
+
+  #define STBDS_SIPROUND() \
+    do {                   \
+      v0 += v1; v1 = STBDS_ROTATE_LEFT(v1, 13);  v1 ^= v0; v0 = STBDS_ROTATE_LEFT(v0,STBDS_SIZE_T_BITS/2); \
+      v2 += v3; v3 = STBDS_ROTATE_LEFT(v3, 16);  v3 ^= v2;                                                 \
+      v2 += v1; v1 = STBDS_ROTATE_LEFT(v1, 17);  v1 ^= v2; v2 = STBDS_ROTATE_LEFT(v2,STBDS_SIZE_T_BITS/2); \
+      v0 += v3; v3 = STBDS_ROTATE_LEFT(v3, 21);  v3 ^= v0;                                                 \
+    } while (0)
+
+  for (i=0; i+sizeof(size_t) <= len; i += sizeof(size_t), d += sizeof(size_t)) {
+    data = d[0] | (d[1] << 8) | (d[2] << 16) | (d[3] << 24);
+    data |= (size_t) (d[4] | (d[5] << 8) | (d[6] << 16) | (d[7] << 24)) << 16 << 16; // discarded if size_t == 4
+
+    v3 ^= data;
+    for (j=0; j < STBDS_SIPHASH_C_ROUNDS; ++j)
+      STBDS_SIPROUND();
+    v0 ^= data;
+  }
+  data = len << (STBDS_SIZE_T_BITS-8);
+  switch (len - i) {
+    case 7: data |= ((size_t) d[6] << 24) << 24; // fall through
+    case 6: data |= ((size_t) d[5] << 20) << 20; // fall through
+    case 5: data |= ((size_t) d[4] << 16) << 16; // fall through
+    case 4: data |= (d[3] << 24); // fall through
+    case 3: data |= (d[2] << 16); // fall through
+    case 2: data |= (d[1] << 8); // fall through
+    case 1: data |= d[0]; // fall through
+    case 0: break;
+  }
+  v3 ^= data;
+  for (j=0; j < STBDS_SIPHASH_C_ROUNDS; ++j)
+    STBDS_SIPROUND();
+  v0 ^= data;
+  v2 ^= 0xff;
+  for (j=0; j < STBDS_SIPHASH_D_ROUNDS; ++j)
+    STBDS_SIPROUND();
+
+#ifdef STBDS_SIPHASH_2_4
+  return v0^v1^v2^v3;
+#else
+  return v1^v2^v3; // slightly stronger since v0^v3 in above cancels out final round operation? I tweeted at the authors of SipHash about this but they didn't reply
+#endif
+}
+
+size_t stbds_hash_bytes(void *p, size_t len, size_t seed)
+{
+#ifdef STBDS_SIPHASH_2_4
+  return stbds_siphash_bytes(p,len,seed);
+#else
+  unsigned char *d = (unsigned char *) p;
+
+  if (len == 4) {
+    unsigned int hash = d[0] | (d[1] << 8) | (d[2] << 16) | (d[3] << 24);
+    #if 0
+    // HASH32-A  Bob Jenkin's hash function w/o large constants
+    hash ^= seed;
+    hash -= (hash<<6);
+    hash ^= (hash>>17);
+    hash -= (hash<<9);
+    hash ^= seed;
+    hash ^= (hash<<4);
+    hash -= (hash<<3);
+    hash ^= (hash<<10);
+    hash ^= (hash>>15);
+    #elif 1
+    // HASH32-BB  Bob Jenkin's presumably-accidental version of Thomas Wang hash with rotates turned into shifts.
+    // Note that converting these back to rotates makes it run a lot slower, presumably due to collisions, so I'm
+    // not really sure what's going on.
+    hash ^= seed;
+    hash = (hash ^ 61) ^ (hash >> 16);
+    hash = hash + (hash << 3);
+    hash = hash ^ (hash >> 4);
+    hash = hash * 0x27d4eb2d;
+    hash ^= seed;
+    hash = hash ^ (hash >> 15);
+    #else  // HASH32-C   -  Murmur3
+    hash ^= seed;
+    hash *= 0xcc9e2d51;
+    hash = (hash << 17) | (hash >> 15);
+    hash *= 0x1b873593;
+    hash ^= seed;
+    hash = (hash << 19) | (hash >> 13);
+    hash = hash*5 + 0xe6546b64;
+    hash ^= hash >> 16;
+    hash *= 0x85ebca6b;
+    hash ^= seed;
+    hash ^= hash >> 13;
+    hash *= 0xc2b2ae35;
+    hash ^= hash >> 16;
+    #endif
+    // Following statistics were measured on a Core i7-6700 @ 4.00Ghz, compiled with clang 7.0.1 -O2
+    // Note that the larger tables have high variance as they were run fewer times
+    //  HASH32-A   //  HASH32-BB  //  HASH32-C
+    //    0.10ms   //    0.10ms   //    0.10ms :      2,000 inserts creating 2K table
+    //    0.96ms   //    0.95ms   //    0.99ms :     20,000 inserts creating 20K table
+    //   14.69ms   //   14.43ms   //   14.97ms :    200,000 inserts creating 200K table
+    //  199.99ms   //  195.36ms   //  202.05ms :  2,000,000 inserts creating 2M table
+    // 2234.84ms   // 2187.74ms   // 2240.38ms : 20,000,000 inserts creating 20M table
+    //   55.68ms   //   53.72ms   //   57.31ms : 500,000 inserts & deletes in 2K table
+    //   63.43ms   //   61.99ms   //   65.73ms : 500,000 inserts & deletes in 20K table
+    //   80.04ms   //   77.96ms   //   81.83ms : 500,000 inserts & deletes in 200K table
+    //  100.42ms   //   97.40ms   //  102.39ms : 500,000 inserts & deletes in 2M table
+    //  119.71ms   //  120.59ms   //  121.63ms : 500,000 inserts & deletes in 20M table
+    //  185.28ms   //  195.15ms   //  187.74ms : 500,000 inserts & deletes in 200M table
+    //   15.58ms   //   14.79ms   //   15.52ms : 200,000 inserts creating 200K table with varying key spacing
+
+    return (((size_t) hash << 16 << 16) | hash) ^ seed;
+  } else if (len == 8 && sizeof(size_t) == 8) {
+    size_t hash = d[0] | (d[1] << 8) | (d[2] << 16) | (d[3] << 24);
+    hash |= (size_t) (d[4] | (d[5] << 8) | (d[6] << 16) | (d[7] << 24)) << 16 << 16; // avoid warning if size_t == 4
+    hash ^= seed;
+    hash = (~hash) + (hash << 21);
+    hash ^= STBDS_ROTATE_RIGHT(hash,24);
+    hash *= 265;
+    hash ^= STBDS_ROTATE_RIGHT(hash,14);
+    hash ^= seed;
+    hash *= 21;
+    hash ^= STBDS_ROTATE_RIGHT(hash,28);
+    hash += (hash << 31);
+    hash = (~hash) + (hash << 18);
+    return hash;
+  } else {
+    return stbds_siphash_bytes(p,len,seed);
+  }
+#endif
+}
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
+
+static int stbds_is_key_equal(void *a, size_t elemsize, void *key, size_t keysize, size_t keyoffset, int mode, size_t i)
+{
+  if (mode >= STBDS_HM_STRING)
+    return 0==strcmp((char *) key, * (char **) ((char *) a + elemsize*i + keyoffset));
+  else
+    return 0==memcmp(key, (char *) a + elemsize*i + keyoffset, keysize);
+}
+
+#define STBDS_HASH_TO_ARR(x,elemsize) ((char*) (x) - (elemsize))
+#define STBDS_ARR_TO_HASH(x,elemsize) ((char*) (x) + (elemsize))
+
+#define stbds_hash_table(a)  ((stbds_hash_index *) stbds_header(a)->hash_table)
+
+void stbds_hmfree_func(void *a, size_t elemsize)
+{
+  if (a == NULL) return;
+  if (stbds_hash_table(a) != NULL) {
+    if (stbds_hash_table(a)->string.mode == STBDS_SH_STRDUP) {
+      size_t i;
+      // skip 0th element, which is default
+      for (i=1; i < stbds_header(a)->length; ++i)
+        STBDS_FREE(NULL, *(char**) ((char *) a + elemsize*i));
+    }
+    stbds_strreset(&stbds_hash_table(a)->string);
+  }
+  STBDS_FREE(NULL, stbds_header(a)->hash_table);
+  STBDS_FREE(NULL, stbds_header(a));
+}
+
+static ptrdiff_t stbds_hm_find_slot(void *a, size_t elemsize, void *key, size_t keysize, size_t keyoffset, int mode)
+{
+  void *raw_a = STBDS_HASH_TO_ARR(a,elemsize);
+  stbds_hash_index *table = stbds_hash_table(raw_a);
+  size_t hash = mode >= STBDS_HM_STRING ? stbds_hash_string((char*)key,table->seed) : stbds_hash_bytes(key, keysize,table->seed);
+  size_t step = STBDS_BUCKET_LENGTH;
+  size_t limit,i;
+  size_t pos;
+  stbds_hash_bucket *bucket;
+
+  if (hash < 2) hash += 2; // stored hash values are forbidden from being 0, so we can detect empty slots
+
+  pos = stbds_probe_position(hash, table->slot_count, table->slot_count_log2);
+
+  for (;;) {
+    STBDS_STATS(++stbds_hash_probes);
+    bucket = &table->storage[pos >> STBDS_BUCKET_SHIFT];
+
+    // start searching from pos to end of bucket, this should help performance on small hash tables that fit in cache
+    for (i=pos & STBDS_BUCKET_MASK; i < STBDS_BUCKET_LENGTH; ++i) {
+      if (bucket->hash[i] == hash) {
+        if (stbds_is_key_equal(a, elemsize, key, keysize, keyoffset, mode, bucket->index[i])) {
+          return (pos & ~STBDS_BUCKET_MASK)+i;
+        }
+      } else if (bucket->hash[i] == STBDS_HASH_EMPTY) {
+        return -1;
+      }
+    }
+
+    // search from beginning of bucket to pos
+    limit = pos & STBDS_BUCKET_MASK;
+    for (i = 0; i < limit; ++i) {
+      if (bucket->hash[i] == hash) {
+        if (stbds_is_key_equal(a, elemsize, key, keysize, keyoffset, mode, bucket->index[i])) {
+          return (pos & ~STBDS_BUCKET_MASK)+i;
+        }
+      } else if (bucket->hash[i] == STBDS_HASH_EMPTY) {
+        return -1;
+      }
+    }
+
+    // quadratic probing
+    pos += step;
+    step += STBDS_BUCKET_LENGTH;
+    pos &= (table->slot_count-1);
+  }
+  /* NOTREACHED */
+}
+
+void * stbds_hmget_key_ts(void *a, size_t elemsize, void *key, size_t keysize, ptrdiff_t *temp, int mode)
+{
+  size_t keyoffset = 0;
+  if (a == NULL) {
+    // make it non-empty so we can return a temp
+    a = stbds_arrgrowf(0, elemsize, 0, 1);
+    stbds_header(a)->length += 1;
+    memset(a, 0, elemsize);
+    *temp = STBDS_INDEX_EMPTY;
+    // adjust a to point after the default element
+    return STBDS_ARR_TO_HASH(a,elemsize);
+  } else {
+    stbds_hash_index *table;
+    void *raw_a = STBDS_HASH_TO_ARR(a,elemsize);
+    // adjust a to point to the default element
+    table = (stbds_hash_index *) stbds_header(raw_a)->hash_table;
+    if (table == 0) {
+      *temp = -1;
+    } else {
+      ptrdiff_t slot = stbds_hm_find_slot(a, elemsize, key, keysize, keyoffset, mode);
+      if (slot < 0) {
+        *temp = STBDS_INDEX_EMPTY;
+      } else {
+        stbds_hash_bucket *b = &table->storage[slot >> STBDS_BUCKET_SHIFT];
+        *temp = b->index[slot & STBDS_BUCKET_MASK];
+      }
+    }
+    return a;
+  }
+}
+
+void * stbds_hmget_key(void *a, size_t elemsize, void *key, size_t keysize, int mode)
+{
+  ptrdiff_t temp;
+  void *p = stbds_hmget_key_ts(a, elemsize, key, keysize, &temp, mode);
+  stbds_temp(STBDS_HASH_TO_ARR(p,elemsize)) = temp;
+  return p;
+}
+
+void * stbds_hmput_default(void *a, size_t elemsize)
+{
+  // three cases:
+  //   a is NULL <- allocate
+  //   a has a hash table but no entries, because of shmode <- grow
+  //   a has entries <- do nothing
+  if (a == NULL || stbds_header(STBDS_HASH_TO_ARR(a,elemsize))->length == 0) {
+    a = stbds_arrgrowf(a ? STBDS_HASH_TO_ARR(a,elemsize) : NULL, elemsize, 0, 1);
+    stbds_header(a)->length += 1;
+    memset(a, 0, elemsize);
+    a=STBDS_ARR_TO_HASH(a,elemsize);
+  }
+  return a;
+}
+
+static char *stbds_strdup(char *str);
+
+void *stbds_hmput_key(void *a, size_t elemsize, void *key, size_t keysize, int mode)
+{
+  size_t keyoffset=0;
+  void *raw_a;
+  stbds_hash_index *table;
+
+  if (a == NULL) {
+    a = stbds_arrgrowf(0, elemsize, 0, 1);
+    memset(a, 0, elemsize);
+    stbds_header(a)->length += 1;
+    // adjust a to point AFTER the default element
+    a = STBDS_ARR_TO_HASH(a,elemsize);
+  }
+
+  // adjust a to point to the default element
+  raw_a = a;
+  a = STBDS_HASH_TO_ARR(a,elemsize);
+
+  table = (stbds_hash_index *) stbds_header(a)->hash_table;
+
+  if (table == NULL || table->used_count >= table->used_count_threshold) {
+    stbds_hash_index *nt;
+    size_t slot_count;
+
+    slot_count = (table == NULL) ? STBDS_BUCKET_LENGTH : table->slot_count*2;
+    nt = stbds_make_hash_index(slot_count, table);
+    if (table)
+      STBDS_FREE(NULL, table);
+    else
+      nt->string.mode = mode >= STBDS_HM_STRING ? STBDS_SH_DEFAULT : 0;
+    stbds_header(a)->hash_table = table = nt;
+    STBDS_STATS(++stbds_hash_grow);
+  }
+
+  // we iterate hash table explicitly because we want to track if we saw a tombstone
+  {
+    size_t hash = mode >= STBDS_HM_STRING ? stbds_hash_string((char*)key,table->seed) : stbds_hash_bytes(key, keysize,table->seed);
+    size_t step = STBDS_BUCKET_LENGTH;
+    size_t pos;
+    ptrdiff_t tombstone = -1;
+    stbds_hash_bucket *bucket;
+
+    // stored hash values are forbidden from being 0, so we can detect empty slots to early out quickly
+    if (hash < 2) hash += 2;
+
+    pos = stbds_probe_position(hash, table->slot_count, table->slot_count_log2);
+
+    for (;;) {
+      size_t limit, i;
+      STBDS_STATS(++stbds_hash_probes);
+      bucket = &table->storage[pos >> STBDS_BUCKET_SHIFT];
+
+      // start searching from pos to end of bucket
+      for (i=pos & STBDS_BUCKET_MASK; i < STBDS_BUCKET_LENGTH; ++i) {
+        if (bucket->hash[i] == hash) {
+          if (stbds_is_key_equal(raw_a, elemsize, key, keysize, keyoffset, mode, bucket->index[i])) {
+            stbds_temp(a) = bucket->index[i];
+            if (mode >= STBDS_HM_STRING)
+              stbds_temp_key(a) = * (char **) ((char *) raw_a + elemsize*bucket->index[i] + keyoffset);
+            return STBDS_ARR_TO_HASH(a,elemsize);
+          }
+        } else if (bucket->hash[i] == 0) {
+          pos = (pos & ~STBDS_BUCKET_MASK) + i;
+          goto found_empty_slot;
+        } else if (tombstone < 0) {
+          if (bucket->index[i] == STBDS_INDEX_DELETED)
+            tombstone = (ptrdiff_t) ((pos & ~STBDS_BUCKET_MASK) + i);
+        }
+      }
+
+      // search from beginning of bucket to pos
+      limit = pos & STBDS_BUCKET_MASK;
+      for (i = 0; i < limit; ++i) {
+        if (bucket->hash[i] == hash) {
+          if (stbds_is_key_equal(raw_a, elemsize, key, keysize, keyoffset, mode, bucket->index[i])) {
+            stbds_temp(a) = bucket->index[i];
+            return STBDS_ARR_TO_HASH(a,elemsize);
+          }
+        } else if (bucket->hash[i] == 0) {
+          pos = (pos & ~STBDS_BUCKET_MASK) + i;
+          goto found_empty_slot;
+        } else if (tombstone < 0) {
+          if (bucket->index[i] == STBDS_INDEX_DELETED)
+            tombstone = (ptrdiff_t) ((pos & ~STBDS_BUCKET_MASK) + i);
+        }
+      }
+
+      // quadratic probing
+      pos += step;
+      step += STBDS_BUCKET_LENGTH;
+      pos &= (table->slot_count-1);
+    }
+   found_empty_slot:
+    if (tombstone >= 0) {
+      pos = tombstone;
+      --table->tombstone_count;
+    }
+    ++table->used_count;
+
+    {
+      ptrdiff_t i = (ptrdiff_t) stbds_arrlen(a);
+      // we want to do stbds_arraddn(1), but we can't use the macros since we don't have something of the right type
+      if ((size_t) i+1 > stbds_arrcap(a))
+        *(void **) &a = stbds_arrgrowf(a, elemsize, 1, 0);
+      raw_a = STBDS_ARR_TO_HASH(a,elemsize);
+
+      STBDS_ASSERT((size_t) i+1 <= stbds_arrcap(a));
+      stbds_header(a)->length = i+1;
+      bucket = &table->storage[pos >> STBDS_BUCKET_SHIFT];
+      bucket->hash[pos & STBDS_BUCKET_MASK] = hash;
+      bucket->index[pos & STBDS_BUCKET_MASK] = i-1;
+      stbds_temp(a) = i-1;
+
+      switch (table->string.mode) {
+         case STBDS_SH_STRDUP:  stbds_temp_key(a) = *(char **) ((char *) a + elemsize*i) = stbds_strdup((char*) key); break;
+         case STBDS_SH_ARENA:   stbds_temp_key(a) = *(char **) ((char *) a + elemsize*i) = stbds_stralloc(&table->string, (char*)key); break;
+         case STBDS_SH_DEFAULT: stbds_temp_key(a) = *(char **) ((char *) a + elemsize*i) = (char *) key; break;
+         default:                memcpy((char *) a + elemsize*i, key, keysize); break;
+      }
+    }
+    return STBDS_ARR_TO_HASH(a,elemsize);
+  }
+}
+
+void * stbds_shmode_func(size_t elemsize, int mode)
+{
+  void *a = stbds_arrgrowf(0, elemsize, 0, 1);
+  stbds_hash_index *h;
+  memset(a, 0, elemsize);
+  stbds_header(a)->length = 1;
+  stbds_header(a)->hash_table = h = (stbds_hash_index *) stbds_make_hash_index(STBDS_BUCKET_LENGTH, NULL);
+  h->string.mode = (unsigned char) mode;
+  return STBDS_ARR_TO_HASH(a,elemsize);
+}
+
+void * stbds_hmdel_key(void *a, size_t elemsize, void *key, size_t keysize, size_t keyoffset, int mode)
+{
+  if (a == NULL) {
+    return 0;
+  } else {
+    stbds_hash_index *table;
+    void *raw_a = STBDS_HASH_TO_ARR(a,elemsize);
+    table = (stbds_hash_index *) stbds_header(raw_a)->hash_table;
+    stbds_temp(raw_a) = 0;
+    if (table == 0) {
+      return a;
+    } else {
+      ptrdiff_t slot;
+      slot = stbds_hm_find_slot(a, elemsize, key, keysize, keyoffset, mode);
+      if (slot < 0)
+        return a;
+      else {
+        stbds_hash_bucket *b = &table->storage[slot >> STBDS_BUCKET_SHIFT];
+        int i = slot & STBDS_BUCKET_MASK;
+        ptrdiff_t old_index = b->index[i];
+        ptrdiff_t final_index = (ptrdiff_t) stbds_arrlen(raw_a)-1-1; // minus one for the raw_a vs a, and minus one for 'last'
+        STBDS_ASSERT(slot < (ptrdiff_t) table->slot_count);
+        --table->used_count;
+        ++table->tombstone_count;
+        stbds_temp(raw_a) = 1;
+        STBDS_ASSERT(table->used_count >= 0);
+        //STBDS_ASSERT(table->tombstone_count < table->slot_count/4);
+        b->hash[i] = STBDS_HASH_DELETED;
+        b->index[i] = STBDS_INDEX_DELETED;
+
+        if (mode == STBDS_HM_STRING && table->string.mode == STBDS_SH_STRDUP)
+          STBDS_FREE(NULL, *(char**) ((char *) a+elemsize*old_index));
+
+        // if indices are the same, memcpy is a no-op, but back-pointer-fixup will fail, so skip
+        if (old_index != final_index) {
+          // swap delete
+          memmove((char*) a + elemsize*old_index, (char*) a + elemsize*final_index, elemsize);
+
+          // now find the slot for the last element
+          if (mode == STBDS_HM_STRING)
+            slot = stbds_hm_find_slot(a, elemsize, *(char**) ((char *) a+elemsize*old_index + keyoffset), keysize, keyoffset, mode);
+          else
+            slot = stbds_hm_find_slot(a, elemsize,  (char* ) a+elemsize*old_index + keyoffset, keysize, keyoffset, mode);
+          STBDS_ASSERT(slot >= 0);
+          b = &table->storage[slot >> STBDS_BUCKET_SHIFT];
+          i = slot & STBDS_BUCKET_MASK;
+          STBDS_ASSERT(b->index[i] == final_index);
+          b->index[i] = old_index;
+        }
+        stbds_header(raw_a)->length -= 1;
+
+        if (table->used_count < table->used_count_shrink_threshold && table->slot_count > STBDS_BUCKET_LENGTH) {
+          stbds_header(raw_a)->hash_table = stbds_make_hash_index(table->slot_count>>1, table);
+          STBDS_FREE(NULL, table);
+          STBDS_STATS(++stbds_hash_shrink);
+        } else if (table->tombstone_count > table->tombstone_count_threshold) {
+          stbds_header(raw_a)->hash_table = stbds_make_hash_index(table->slot_count   , table);
+          STBDS_FREE(NULL, table);
+          STBDS_STATS(++stbds_hash_rebuild);
+        }
+
+        return a;
+      }
+    }
+  }
+  /* NOTREACHED */
+}
+
+static char *stbds_strdup(char *str)
+{
+  // to keep replaceable allocator simple, we don't want to use strdup.
+  // rolling our own also avoids problem of strdup vs _strdup
+  size_t len = strlen(str)+1;
+  char *p = (char*) STBDS_REALLOC(NULL, 0, len);
+  memmove(p, str, len);
+  return p;
+}
+
+#ifndef STBDS_STRING_ARENA_BLOCKSIZE_MIN
+#define STBDS_STRING_ARENA_BLOCKSIZE_MIN  512u
+#endif
+#ifndef STBDS_STRING_ARENA_BLOCKSIZE_MAX
+#define STBDS_STRING_ARENA_BLOCKSIZE_MAX  (1u<<20)
+#endif
+
+char *stbds_stralloc(stbds_string_arena *a, char *str)
+{
+  char *p;
+  size_t len = strlen(str)+1;
+  if (len > a->remaining) {
+    // compute the next blocksize
+    size_t blocksize = a->block;
+
+    // size is 512, 512, 1024, 1024, 2048, 2048, 4096, 4096, etc., so that
+    // there are log(SIZE) allocations to free when we destroy the table
+    blocksize = (size_t) (STBDS_STRING_ARENA_BLOCKSIZE_MIN) << (blocksize>>1);
+
+    // if size is under 1M, advance to next blocktype
+    if (blocksize < (size_t)(STBDS_STRING_ARENA_BLOCKSIZE_MAX))
+      ++a->block;
+
+    if (len > blocksize) {
+      // if string is larger than blocksize, then just allocate the full size.
+      // note that we still advance string_block so block size will continue
+      // increasing, so e.g. if somebody only calls this with 1000-long strings,
+      // eventually the arena will start doubling and handling those as well
+      stbds_string_block *sb = (stbds_string_block *) STBDS_REALLOC(NULL, 0, sizeof(*sb)-8 + len);
+      memmove(sb->storage, str, len);
+      if (a->storage) {
+        // insert it after the first element, so that we don't waste the space there
+        sb->next = a->storage->next;
+        a->storage->next = sb;
+      } else {
+        sb->next = 0;
+        a->storage = sb;
+        a->remaining = 0; // this is redundant, but good for clarity
+      }
+      return sb->storage;
+    } else {
+      stbds_string_block *sb = (stbds_string_block *) STBDS_REALLOC(NULL, 0, sizeof(*sb)-8 + blocksize);
+      sb->next = a->storage;
+      a->storage = sb;
+      a->remaining = blocksize;
+    }
+  }
+
+  STBDS_ASSERT(len <= a->remaining);
+  p = a->storage->storage + a->remaining - len;
+  a->remaining -= len;
+  memmove(p, str, len);
+  return p;
+}
+
+void stbds_strreset(stbds_string_arena *a)
+{
+  stbds_string_block *x,*y;
+  x = a->storage;
+  while (x) {
+    y = x->next;
+    STBDS_FREE(NULL, x);
+    x = y;
+  }
+  memset(a, 0, sizeof(*a));
+}
+
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//   UNIT TESTS
+//
+
+#ifdef STBDS_UNIT_TESTS
+#include <stdio.h>
+#ifdef STBDS_ASSERT_WAS_UNDEFINED
+#undef STBDS_ASSERT
+#endif
+#ifndef STBDS_ASSERT
+#define STBDS_ASSERT assert
+#include <assert.h>
+#endif
+
+typedef struct { int key,b,c,d; } stbds_struct;
+typedef struct { int key[2],b,c,d; } stbds_struct2;
+
+static char buffer[256];
+char *strkey(int n)
+{
+#if defined(_WIN32) && defined(__STDC_WANT_SECURE_LIB__)
+   sprintf_s(buffer, sizeof(buffer), "test_%d", n);
+#else
+   sprintf(buffer, "test_%d", n);
+#endif
+   return buffer;
+}
+
+void stbds_unit_tests(void)
+{
+#if defined(_MSC_VER) && _MSC_VER <= 1200 && defined(__cplusplus)
+  // VC6 C++ doesn't like the template<> trick on unnamed structures, so do nothing!
+  STBDS_ASSERT(0);
+#else
+  const int testsize = 100000;
+  const int testsize2 = testsize/20;
+  int *arr=NULL;
+  struct { int   key;        int value; }  *intmap  = NULL;
+  struct { char *key;        int value; }  *strmap  = NULL, s;
+  struct { stbds_struct key; int value; }  *map     = NULL;
+  stbds_struct                             *map2    = NULL;
+  stbds_struct2                            *map3    = NULL;
+  stbds_string_arena                        sa      = { 0 };
+  int key3[2] = { 1,2 };
+  ptrdiff_t temp;
+
+  int i,j;
+
+  STBDS_ASSERT(arrlen(arr)==0);
+  for (i=0; i < 20000; i += 50) {
+    for (j=0; j < i; ++j)
+      arrpush(arr,j);
+    arrfree(arr);
+  }
+
+  for (i=0; i < 4; ++i) {
+    arrpush(arr,1); arrpush(arr,2); arrpush(arr,3); arrpush(arr,4);
+    arrdel(arr,i);
+    arrfree(arr);
+    arrpush(arr,1); arrpush(arr,2); arrpush(arr,3); arrpush(arr,4);
+    arrdelswap(arr,i);
+    arrfree(arr);
+  }
+
+  for (i=0; i < 5; ++i) {
+    arrpush(arr,1); arrpush(arr,2); arrpush(arr,3); arrpush(arr,4);
+    stbds_arrins(arr,i,5);
+    STBDS_ASSERT(arr[i] == 5);
+    if (i < 4)
+      STBDS_ASSERT(arr[4] == 4);
+    arrfree(arr);
+  }
+
+  i = 1;
+  STBDS_ASSERT(hmgeti(intmap,i) == -1);
+  hmdefault(intmap, -2);
+  STBDS_ASSERT(hmgeti(intmap, i) == -1);
+  STBDS_ASSERT(hmget (intmap, i) == -2);
+  for (i=0; i < testsize; i+=2)
+    hmput(intmap, i, i*5);
+  for (i=0; i < testsize; i+=1) {
+    if (i & 1) STBDS_ASSERT(hmget(intmap, i) == -2 );
+    else       STBDS_ASSERT(hmget(intmap, i) == i*5);
+    if (i & 1) STBDS_ASSERT(hmget_ts(intmap, i, temp) == -2 );
+    else       STBDS_ASSERT(hmget_ts(intmap, i, temp) == i*5);
+  }
+  for (i=0; i < testsize; i+=2)
+    hmput(intmap, i, i*3);
+  for (i=0; i < testsize; i+=1)
+    if (i & 1) STBDS_ASSERT(hmget(intmap, i) == -2 );
+    else       STBDS_ASSERT(hmget(intmap, i) == i*3);
+  for (i=2; i < testsize; i+=4)
+    hmdel(intmap, i); // delete half the entries
+  for (i=0; i < testsize; i+=1)
+    if (i & 3) STBDS_ASSERT(hmget(intmap, i) == -2 );
+    else       STBDS_ASSERT(hmget(intmap, i) == i*3);
+  for (i=0; i < testsize; i+=1)
+    hmdel(intmap, i); // delete the rest of the entries
+  for (i=0; i < testsize; i+=1)
+    STBDS_ASSERT(hmget(intmap, i) == -2 );
+  hmfree(intmap);
+  for (i=0; i < testsize; i+=2)
+    hmput(intmap, i, i*3);
+  hmfree(intmap);
+
+  #if defined(__clang__) || defined(__GNUC__)
+  #ifndef __cplusplus
+  intmap = NULL;
+  hmput(intmap, 15, 7);
+  hmput(intmap, 11, 3);
+  hmput(intmap,  9, 5);
+  STBDS_ASSERT(hmget(intmap, 9) == 5);
+  STBDS_ASSERT(hmget(intmap, 11) == 3);
+  STBDS_ASSERT(hmget(intmap, 15) == 7);
+  #endif
+  #endif
+
+  for (i=0; i < testsize; ++i)
+    stralloc(&sa, strkey(i));
+  strreset(&sa);
+
+  {
+    s.key = "a", s.value = 1;
+    shputs(strmap, s);
+    STBDS_ASSERT(*strmap[0].key == 'a');
+    STBDS_ASSERT(strmap[0].key == s.key);
+    STBDS_ASSERT(strmap[0].value == s.value);
+    shfree(strmap);
+  }
+
+  {
+    s.key = "a", s.value = 1;
+    sh_new_strdup(strmap);
+    shputs(strmap, s);
+    STBDS_ASSERT(*strmap[0].key == 'a');
+    STBDS_ASSERT(strmap[0].key != s.key);
+    STBDS_ASSERT(strmap[0].value == s.value);
+    shfree(strmap);
+  }
+
+  {
+    s.key = "a", s.value = 1;
+    sh_new_arena(strmap);
+    shputs(strmap, s);
+    STBDS_ASSERT(*strmap[0].key == 'a');
+    STBDS_ASSERT(strmap[0].key != s.key);
+    STBDS_ASSERT(strmap[0].value == s.value);
+    shfree(strmap);
+  }
+
+  for (j=0; j < 2; ++j) {
+    STBDS_ASSERT(shgeti(strmap,"foo") == -1);
+    if (j == 0)
+      sh_new_strdup(strmap);
+    else
+      sh_new_arena(strmap);
+    STBDS_ASSERT(shgeti(strmap,"foo") == -1);
+    shdefault(strmap, -2);
+    STBDS_ASSERT(shgeti(strmap,"foo") == -1);
+    for (i=0; i < testsize; i+=2)
+      shput(strmap, strkey(i), i*3);
+    for (i=0; i < testsize; i+=1)
+      if (i & 1) STBDS_ASSERT(shget(strmap, strkey(i)) == -2 );
+      else       STBDS_ASSERT(shget(strmap, strkey(i)) == i*3);
+    for (i=2; i < testsize; i+=4)
+      shdel(strmap, strkey(i)); // delete half the entries
+    for (i=0; i < testsize; i+=1)
+      if (i & 3) STBDS_ASSERT(shget(strmap, strkey(i)) == -2 );
+      else       STBDS_ASSERT(shget(strmap, strkey(i)) == i*3);
+    for (i=0; i < testsize; i+=1)
+      shdel(strmap, strkey(i)); // delete the rest of the entries
+    for (i=0; i < testsize; i+=1)
+      STBDS_ASSERT(shget(strmap, strkey(i)) == -2 );
+    shfree(strmap);
+  }
+
+  {
+    struct { char *key; char value; } *hash = NULL;
+    char name[4] = "jen";
+    shput(hash, "bob"   , 'h');
+    shput(hash, "sally" , 'e');
+    shput(hash, "fred"  , 'l');
+    shput(hash, "jen"   , 'x');
+    shput(hash, "doug"  , 'o');
+
+    shput(hash, name    , 'l');
+    shfree(hash);
+  }
+
+  for (i=0; i < testsize; i += 2) {
+    stbds_struct s = { i,i*2,i*3,i*4 };
+    hmput(map, s, i*5);
+  }
+
+  for (i=0; i < testsize; i += 1) {
+    stbds_struct s = { i,i*2,i*3  ,i*4 };
+    stbds_struct t = { i,i*2,i*3+1,i*4 };
+    if (i & 1) STBDS_ASSERT(hmget(map, s) == 0);
+    else       STBDS_ASSERT(hmget(map, s) == i*5);
+    if (i & 1) STBDS_ASSERT(hmget_ts(map, s, temp) == 0);
+    else       STBDS_ASSERT(hmget_ts(map, s, temp) == i*5);
+    //STBDS_ASSERT(hmget(map, t.key) == 0);
+  }
+
+  for (i=0; i < testsize; i += 2) {
+    stbds_struct s = { i,i*2,i*3,i*4 };
+    hmputs(map2, s);
+  }
+  hmfree(map);
+
+  for (i=0; i < testsize; i += 1) {
+    stbds_struct s = { i,i*2,i*3,i*4 };
+    stbds_struct t = { i,i*2,i*3+1,i*4 };
+    if (i & 1) STBDS_ASSERT(hmgets(map2, s.key).d == 0);
+    else       STBDS_ASSERT(hmgets(map2, s.key).d == i*4);
+    //STBDS_ASSERT(hmgetp(map2, t.key) == 0);
+  }
+  hmfree(map2);
+
+  for (i=0; i < testsize; i += 2) {
+    stbds_struct2 s = { { i,i*2 }, i*3,i*4, i*5 };
+    hmputs(map3, s);
+  }
+  for (i=0; i < testsize; i += 1) {
+    stbds_struct2 s = { { i,i*2}, i*3, i*4, i*5 };
+    stbds_struct2 t = { { i,i*2}, i*3+1, i*4, i*5 };
+    if (i & 1) STBDS_ASSERT(hmgets(map3, s.key).d == 0);
+    else       STBDS_ASSERT(hmgets(map3, s.key).d == i*5);
+    //STBDS_ASSERT(hmgetp(map3, t.key) == 0);
+  }
+#endif
+}
+#endif
+
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2019 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/