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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+ copyright notice, this list of conditions and the
+ following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the
+ following disclaimer in the documentation and/or other
+ materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+ contributors may be used to endorse or promote products
+ derived from this software without specific prior
+ written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+
+/** @file DXFHelper.h
+ * @brief Internal utilities for the DXF loader.
+ */
+
+#ifndef INCLUDED_DXFHELPER_H
+#define INCLUDED_DXFHELPER_H
+
+#include <assimp/LineSplitter.h>
+#include <assimp/TinyFormatter.h>
+#include <assimp/StreamReader.h>
+#include <assimp/fast_atof.h>
+#include <vector>
+#include <assimp/DefaultLogger.hpp>
+
+namespace Assimp {
+namespace DXF {
+
+// read pairs of lines, parse group code and value and provide utilities
+// to convert the data to the target data type.
+// do NOT skip empty lines. In DXF files, they count as valid data.
+class LineReader {
+public:
+ LineReader(StreamReaderLE& reader)
+ : splitter(reader,false,true)
+ , groupcode( 0 )
+ , value()
+ , end() {
+ // empty
+ }
+
+ // -----------------------------------------
+ bool Is(int gc, const char* what) const {
+ return groupcode == gc && !strcmp(what,value.c_str());
+ }
+
+ // -----------------------------------------
+ bool Is(int gc) const {
+ return groupcode == gc;
+ }
+
+ // -----------------------------------------
+ int GroupCode() const {
+ return groupcode;
+ }
+
+ // -----------------------------------------
+ const std::string& Value() const {
+ return value;
+ }
+
+ // -----------------------------------------
+ bool End() const {
+ return !((bool)*this);
+ }
+
+ // -----------------------------------------
+ unsigned int ValueAsUnsignedInt() const {
+ return strtoul10(value.c_str());
+ }
+
+ // -----------------------------------------
+ int ValueAsSignedInt() const {
+ return strtol10(value.c_str());
+ }
+
+ // -----------------------------------------
+ float ValueAsFloat() const {
+ return fast_atof(value.c_str());
+ }
+
+ // -----------------------------------------
+ /** pseudo-iterator increment to advance to the next (groupcode/value) pair */
+ LineReader& operator++() {
+ if (end) {
+ if (end == 1) {
+ ++end;
+ }
+ return *this;
+ }
+
+ try {
+ groupcode = strtol10(splitter->c_str());
+ splitter++;
+
+ value = *splitter;
+ splitter++;
+
+ // automatically skip over {} meta blocks (these are for application use
+ // and currently not relevant for Assimp).
+ if (value.length() && value[0] == '{') {
+
+ size_t cnt = 0;
+ for(;splitter->length() && splitter->at(0) != '}'; splitter++, cnt++);
+
+ splitter++;
+ ASSIMP_LOG_VERBOSE_DEBUG("DXF: skipped over control group (",cnt," lines)");
+ }
+ } catch(std::logic_error&) {
+ ai_assert(!splitter);
+ }
+ if (!splitter) {
+ end = 1;
+ }
+ return *this;
+ }
+
+ // -----------------------------------------
+ LineReader& operator++(int) {
+ return ++(*this);
+ }
+
+
+ // -----------------------------------------
+ operator bool() const {
+ return end <= 1;
+ }
+
+private:
+ LineSplitter splitter;
+ int groupcode;
+ std::string value;
+ int end;
+};
+
+// represents a POLYLINE or a LWPOLYLINE. or even a 3DFACE The data is converted as needed.
+struct PolyLine {
+ PolyLine()
+ : flags() {
+ // empty
+ }
+
+ std::vector<aiVector3D> positions;
+ std::vector<aiColor4D> colors;
+ std::vector<unsigned int> indices;
+ std::vector<unsigned int> counts;
+ unsigned int flags;
+
+ std::string layer;
+ std::string desc;
+};
+
+// reference to a BLOCK. Specifies its own coordinate system.
+struct InsertBlock {
+ InsertBlock()
+ : pos()
+ , scale(1.f,1.f,1.f)
+ , angle()
+ , name() {
+ // empty
+ }
+
+ aiVector3D pos;
+ aiVector3D scale;
+ float angle;
+
+ std::string name;
+};
+
+
+// keeps track of all geometry in a single BLOCK.
+struct Block
+{
+ std::vector< std::shared_ptr<PolyLine> > lines;
+ std::vector<InsertBlock> insertions;
+
+ std::string name;
+ aiVector3D base;
+};
+
+
+struct FileData
+{
+ // note: the LAST block always contains the stuff from ENTITIES.
+ std::vector<Block> blocks;
+};
+
+}
+} // Namespace Assimp
+
+#endif