1 files changed, 261 insertions, 0 deletions
diff --git a/libs/assimp/contrib/draco/src/draco/io/parser_utils.cc b/libs/assimp/contrib/draco/src/draco/io/parser_utils.cc
new file mode 100644
index 0000000..12afacf
--- /dev/null
+++ b/libs/assimp/contrib/draco/src/draco/io/parser_utils.cc
@@ -0,0 +1,261 @@
+// Copyright 2016 The Draco Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#include "draco/io/parser_utils.h"
+
+#include <algorithm>
+#include <cctype>
+#include <cmath>
+#include <iterator>
+#include <limits>
+
+namespace draco {
+namespace parser {
+
+void SkipCharacters(DecoderBuffer *buffer, const char *skip_chars) {
+  if (skip_chars == nullptr) {
+    return;
+  }
+  const int num_skip_chars = static_cast<int>(strlen(skip_chars));
+  char c;
+  while (buffer->Peek(&c)) {
+    // Check all characters in the pattern.
+    bool skip = false;
+    for (int i = 0; i < num_skip_chars; ++i) {
+      if (c == skip_chars[i]) {
+        skip = true;
+        break;
+      }
+    }
+    if (!skip) {
+      return;
+    }
+    buffer->Advance(1);
+  }
+}
+
+void SkipWhitespace(DecoderBuffer *buffer) {
+  bool end_reached = false;
+  while (PeekWhitespace(buffer, &end_reached) && !end_reached) {
+    // Skip the whitespace character
+    buffer->Advance(1);
+  }
+}
+
+bool PeekWhitespace(DecoderBuffer *buffer, bool *end_reached) {
+  uint8_t c;
+  if (!buffer->Peek(&c)) {
+    *end_reached = true;
+    return false;  // eof reached.
+  }
+  if (!isspace(c)) {
+    return false;  // Non-whitespace character reached.
+  }
+  return true;
+}
+
+void SkipLine(DecoderBuffer *buffer) { ParseLine(buffer, nullptr); }
+
+bool ParseFloat(DecoderBuffer *buffer, float *value) {
+  // Read optional sign.
+  char ch;
+  if (!buffer->Peek(&ch)) {
+    return false;
+  }
+  int sign = GetSignValue(ch);
+  if (sign != 0) {
+    buffer->Advance(1);
+  } else {
+    sign = 1;
+  }
+
+  // Parse integer component.
+  bool have_digits = false;
+  double v = 0.0;
+  while (buffer->Peek(&ch) && ch >= '0' && ch <= '9') {
+    v *= 10.0;
+    v += (ch - '0');
+    buffer->Advance(1);
+    have_digits = true;
+  }
+  if (ch == '.') {
+    // Parse fractional component.
+    buffer->Advance(1);
+    double fraction = 1.0;
+    while (buffer->Peek(&ch) && ch >= '0' && ch <= '9') {
+      fraction *= 0.1;
+      v += (ch - '0') * fraction;
+      buffer->Advance(1);
+      have_digits = true;
+    }
+  }
+
+  if (!have_digits) {
+    // Check for special constants (inf, nan, ...).
+    std::string text;
+    if (!ParseString(buffer, &text)) {
+      return false;
+    }
+    if (text == "inf" || text == "Inf") {
+      v = std::numeric_limits<double>::infinity();
+    } else if (text == "nan" || text == "NaN") {
+      v = nan("");
+    } else {
+      // Invalid string.
+      return false;
+    }
+  } else {
+    // Handle exponent if present.
+    if (ch == 'e' || ch == 'E') {
+      buffer->Advance(1);  // Skip 'e' marker.
+
+      // Parse integer exponent.
+      int32_t exponent = 0;
+      if (!ParseSignedInt(buffer, &exponent)) {
+        return false;
+      }
+
+      // Apply exponent scaling to value.
+      v *= pow(static_cast<double>(10.0), exponent);
+    }
+  }
+
+  *value = (sign < 0) ? static_cast<float>(-v) : static_cast<float>(v);
+  return true;
+}
+
+bool ParseSignedInt(DecoderBuffer *buffer, int32_t *value) {
+  // Parse any explicit sign and set the appropriate largest magnitude
+  // value that can be represented without overflow.
+  char ch;
+  if (!buffer->Peek(&ch)) {
+    return false;
+  }
+  const int sign = GetSignValue(ch);
+  if (sign != 0) {
+    buffer->Advance(1);
+  }
+
+  // Attempt to parse integer body.
+  uint32_t v;
+  if (!ParseUnsignedInt(buffer, &v)) {
+    return false;
+  }
+  *value = (sign < 0) ? -v : v;
+  return true;
+}
+
+bool ParseUnsignedInt(DecoderBuffer *buffer, uint32_t *value) {
+  // Parse the number until we run out of digits.
+  uint32_t v = 0;
+  char ch;
+  bool have_digits = false;
+  while (buffer->Peek(&ch) && ch >= '0' && ch <= '9') {
+    v *= 10;
+    v += (ch - '0');
+    buffer->Advance(1);
+    have_digits = true;
+  }
+  if (!have_digits) {
+    return false;
+  }
+  *value = v;
+  return true;
+}
+
+int GetSignValue(char c) {
+  if (c == '-') {
+    return -1;
+  }
+  if (c == '+') {
+    return 1;
+  }
+  return 0;
+}
+
+bool ParseString(DecoderBuffer *buffer, std::string *out_string) {
+  out_string->clear();
+  SkipWhitespace(buffer);
+  bool end_reached = false;
+  while (!PeekWhitespace(buffer, &end_reached) && !end_reached) {
+    char c;
+    if (!buffer->Decode(&c)) {
+      return false;
+    }
+    *out_string += c;
+  }
+  return true;
+}
+
+void ParseLine(DecoderBuffer *buffer, std::string *out_string) {
+  if (out_string) {
+    out_string->clear();
+  }
+  char c;
+  bool delim_reached = false;
+  while (buffer->Peek(&c)) {
+    // Check if |c| is a delimeter. We want to parse all delimeters until we
+    // reach a non-delimeter symbol. (E.g. we want to ignore '\r\n' at the end
+    // of the line).
+    const bool is_delim = (c == '\r' || c == '\n');
+
+    // If |c| is a delimeter or it is a non-delimeter symbol before any
+    // delimeter was found, we advance the buffer to the next character.
+    if (is_delim || !delim_reached) {
+      buffer->Advance(1);
+    }
+
+    if (is_delim) {
+      // Mark that we found a delimeter symbol.
+      delim_reached = true;
+      continue;
+    }
+    if (delim_reached) {
+      // We reached a non-delimeter symbol after a delimeter was already found.
+      // Stop the parsing.
+      return;
+    }
+    // Otherwise we put the non-delimeter symbol into the output string.
+    if (out_string) {
+      out_string->push_back(c);
+    }
+  }
+}
+
+DecoderBuffer ParseLineIntoDecoderBuffer(DecoderBuffer *buffer) {
+  const char *const head = buffer->data_head();
+  char c;
+  while (buffer->Peek(&c)) {
+    // Skip the character.
+    buffer->Advance(1);
+    if (c == '\n') {
+      break;  // End of the line reached.
+    }
+    if (c == '\r') {
+      continue;  // Ignore extra line ending characters.
+    }
+  }
+  DecoderBuffer out_buffer;
+  out_buffer.Init(head, buffer->data_head() - head);
+  return out_buffer;
+}
+
+std::string ToLower(const std::string &str) {
+  std::string out;
+  std::transform(str.begin(), str.end(), std::back_inserter(out), tolower);
+  return out;
+}
+
+}  // namespace parser
+}  // namespace draco