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  Open Asset Import Library (assimp)
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  */
  
  /** @file  MD5Parser.cpp
   *  @brief Implementation of the MD5 parser class
   */
  
  
  // internal headers
  #include "MD5Loader.h"
  #include "MaterialSystem.h"
  #include "fast_atof.h"
  #include "ParsingUtils.h"
  #include "StringComparison.h"
  #include <assimp/DefaultLogger.hpp>
  #include <assimp/mesh.h>
  
  
  
  using namespace Assimp;
  using namespace Assimp::MD5;
  
  // ------------------------------------------------------------------------------------------------
  // Parse the segment structure fo a MD5 file
  MD5Parser::MD5Parser(char* _buffer, unsigned int _fileSize )
  {
      ai_assert(NULL != _buffer && 0 != _fileSize);
  
      buffer = _buffer;
      fileSize = _fileSize;
      lineNumber = 0;
  
      DefaultLogger::get()->debug("MD5Parser begin");
  
      // parse the file header
      ParseHeader();
  
      // and read all sections until we're finished
      bool running = true;
      while (running) {
          mSections.push_back(Section());
          Section& sec = mSections.back();
          if(!ParseSection(sec))  {
              break;
          }
      }
  
      if ( !DefaultLogger::isNullLogger())    {
          char szBuffer[128]; // should be sufficiently large
          ::ai_snprintf(szBuffer,128,"MD5Parser end. Parsed %i sections",(int)mSections.size());
          DefaultLogger::get()->debug(szBuffer);
      }
  }
  
  // ------------------------------------------------------------------------------------------------
  // Report error to the log stream
  /*static*/ AI_WONT_RETURN void MD5Parser::ReportError (const char* error, unsigned int line)
  {
      char szBuffer[1024];
      ::ai_snprintf(szBuffer, 1024, "[MD5] Line %u: %s",line,error);
      throw DeadlyImportError(szBuffer);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Report warning to the log stream
  /*static*/ void MD5Parser::ReportWarning (const char* warn, unsigned int line)
  {
      char szBuffer[1024];
      ::sprintf(szBuffer,"[MD5] Line %u: %s",line,warn);
      DefaultLogger::get()->warn(szBuffer);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Parse and validate the MD5 header
  void MD5Parser::ParseHeader()
  {
      // parse and validate the file version
      SkipSpaces();
      if (!TokenMatch(buffer,"MD5Version",10))    {
          ReportError("Invalid MD5 file: MD5Version tag has not been found");
      }
      SkipSpaces();
      unsigned int iVer = ::strtoul10(buffer,(const char**)&buffer);
      if (10 != iVer) {
          ReportError("MD5 version tag is unknown (10 is expected)");
      }
      SkipLine();
  
      // print the command line options to the console
      // FIX: can break the log length limit, so we need to be careful
      char* sz = buffer;
      while (!IsLineEnd( *buffer++));
      DefaultLogger::get()->info(std::string(sz,std::min((uintptr_t)MAX_LOG_MESSAGE_LENGTH, (uintptr_t)(buffer-sz))));
      SkipSpacesAndLineEnd();
  }
  
  // ------------------------------------------------------------------------------------------------
  // Recursive MD5 parsing function
  bool MD5Parser::ParseSection(Section& out)
  {
      // store the current line number for use in error messages
      out.iLineNumber = lineNumber;
  
      // first parse the name of the section
      char* sz = buffer;
      while (!IsSpaceOrNewLine( *buffer))buffer++;
      out.mName = std::string(sz,(uintptr_t)(buffer-sz));
      SkipSpaces();
  
      bool running = true;
      while (running) {
          if ('{' == *buffer) {
              // it is a normal section so read all lines
              buffer++;
              bool run = true;
              while (run)
              {
                  if (!SkipSpacesAndLineEnd()) {
                      return false; // seems this was the last section
                  }
                  if ('}' == *buffer) {
                      buffer++;
                      break;
                  }
  
                  out.mElements.push_back(Element());
                  Element& elem = out.mElements.back();
  
                  elem.iLineNumber = lineNumber;
                  elem.szStart = buffer;
  
                  // terminate the line with zero
                  while (!IsLineEnd( *buffer))buffer++;
                  if (*buffer) {
                      ++lineNumber;
                      *buffer++ = '\0';
                  }
              }
              break;
          }
          else if (!IsSpaceOrNewLine(*buffer))    {
              // it is an element at global scope. Parse its value and go on
              sz = buffer;
              while (!IsSpaceOrNewLine( *buffer++));
              out.mGlobalValue = std::string(sz,(uintptr_t)(buffer-sz));
              continue;
          }
          break;
      }
      return SkipSpacesAndLineEnd();
  }
  
  // ------------------------------------------------------------------------------------------------
  // Some dirty macros just because they're so funny and easy to debug
  
  // skip all spaces ... handle EOL correctly
  #define AI_MD5_SKIP_SPACES()  if(!SkipSpaces(&sz)) \
      MD5Parser::ReportWarning("Unexpected end of line",elem.iLineNumber);
  
  	// read a triple float in brackets: (1.0 1.0 1.0)
  #define AI_MD5_READ_TRIPLE(vec) \
      AI_MD5_SKIP_SPACES(); \
      if ('(' != *sz++) \
          MD5Parser::ReportWarning("Unexpected token: ( was expected",elem.iLineNumber); \
      AI_MD5_SKIP_SPACES(); \
      sz = fast_atoreal_move<float>(sz,(float&)vec.x); \
      AI_MD5_SKIP_SPACES(); \
      sz = fast_atoreal_move<float>(sz,(float&)vec.y); \
      AI_MD5_SKIP_SPACES(); \
      sz = fast_atoreal_move<float>(sz,(float&)vec.z); \
      AI_MD5_SKIP_SPACES(); \
      if (')' != *sz++) \
          MD5Parser::ReportWarning("Unexpected token: ) was expected",elem.iLineNumber);
  
  	// parse a string, enclosed in quotation marks or not
  #define AI_MD5_PARSE_STRING(out) \
      bool bQuota = (*sz == '\"'); \
      const char* szStart = sz; \
      while (!IsSpaceOrNewLine(*sz))++sz; \
      const char* szEnd = sz; \
      if (bQuota) { \
          szStart++; \
          if ('\"' != *(szEnd-=1)) { \
              MD5Parser::ReportWarning("Expected closing quotation marks in string", \
                  elem.iLineNumber); \
              continue; \
          } \
      } \
      out.length = (size_t)(szEnd - szStart); \
      ::memcpy(out.data,szStart,out.length); \
      out.data[out.length] = '\0';
  
  	// parse a string, enclosed in quotation marks
  #define AI_MD5_PARSE_STRING_IN_QUOTATION(out) \
  	while('\"'!=*sz)++sz; \
      const char* szStart = ++sz; \
  	while('\"'!=*sz)++sz; \
      const char* szEnd = (sz++); \
      out.length = (size_t)(szEnd - szStart); \
      ::memcpy(out.data,szStart,out.length); \
      out.data[out.length] = '\0';
  // ------------------------------------------------------------------------------------------------
  // .MD5MESH parsing function
  MD5MeshParser::MD5MeshParser(SectionList& mSections)
  {
      DefaultLogger::get()->debug("MD5MeshParser begin");
  
      // now parse all sections
      for (SectionList::const_iterator iter =  mSections.begin(), iterEnd = mSections.end();iter != iterEnd;++iter){
          if ( (*iter).mName == "numMeshes")  {
              mMeshes.reserve(::strtoul10((*iter).mGlobalValue.c_str()));
          }
          else if ( (*iter).mName == "numJoints") {
              mJoints.reserve(::strtoul10((*iter).mGlobalValue.c_str()));
          }
          else if ((*iter).mName == "joints") {
              // "origin" -1 ( -0.000000 0.016430 -0.006044 ) ( 0.707107 0.000000 0.707107 )
              for (const auto & elem : (*iter).mElements){
                  mJoints.push_back(BoneDesc());
                  BoneDesc& desc = mJoints.back();
  				
                  const char* sz = elem.szStart;
  				AI_MD5_PARSE_STRING_IN_QUOTATION(desc.mName);
                  AI_MD5_SKIP_SPACES();
  
                  // negative values, at least -1, is allowed here
                  desc.mParentIndex = (int)strtol10(sz,&sz);
  
                  AI_MD5_READ_TRIPLE(desc.mPositionXYZ);
                  AI_MD5_READ_TRIPLE(desc.mRotationQuat); // normalized quaternion, so w is not there
              }
          }
          else if ((*iter).mName == "mesh")   {
              mMeshes.push_back(MeshDesc());
              MeshDesc& desc = mMeshes.back();
  
              for (const auto & elem : (*iter).mElements){
                  const char* sz = elem.szStart;
  
                  // shader attribute
                  if (TokenMatch(sz,"shader",6))  {
                      AI_MD5_SKIP_SPACES();
                      AI_MD5_PARSE_STRING_IN_QUOTATION(desc.mShader);
                  }
                  // numverts attribute
                  else if (TokenMatch(sz,"numverts",8))   {
                      AI_MD5_SKIP_SPACES();
                      desc.mVertices.resize(strtoul10(sz));
                  }
                  // numtris attribute
                  else if (TokenMatch(sz,"numtris",7))    {
                      AI_MD5_SKIP_SPACES();
                      desc.mFaces.resize(strtoul10(sz));
                  }
                  // numweights attribute
                  else if (TokenMatch(sz,"numweights",10))    {
                      AI_MD5_SKIP_SPACES();
                      desc.mWeights.resize(strtoul10(sz));
                  }
                  // vert attribute
                  // "vert 0 ( 0.394531 0.513672 ) 0 1"
                  else if (TokenMatch(sz,"vert",4))   {
                      AI_MD5_SKIP_SPACES();
                      const unsigned int idx = ::strtoul10(sz,&sz);
                      AI_MD5_SKIP_SPACES();
                      if (idx >= desc.mVertices.size())
                          desc.mVertices.resize(idx+1);
  
                      VertexDesc& vert = desc.mVertices[idx];
                      if ('(' != *sz++)
                          MD5Parser::ReportWarning("Unexpected token: ( was expected",elem.iLineNumber);
                      AI_MD5_SKIP_SPACES();
                      sz = fast_atoreal_move<float>(sz,(float&)vert.mUV.x);
                      AI_MD5_SKIP_SPACES();
                      sz = fast_atoreal_move<float>(sz,(float&)vert.mUV.y);
                      AI_MD5_SKIP_SPACES();
                      if (')' != *sz++)
                          MD5Parser::ReportWarning("Unexpected token: ) was expected",elem.iLineNumber);
                      AI_MD5_SKIP_SPACES();
                      vert.mFirstWeight = ::strtoul10(sz,&sz);
                      AI_MD5_SKIP_SPACES();
                      vert.mNumWeights = ::strtoul10(sz,&sz);
                  }
                  // tri attribute
                  // "tri 0 15 13 12"
                  else if (TokenMatch(sz,"tri",3)) {
                      AI_MD5_SKIP_SPACES();
                      const unsigned int idx = strtoul10(sz,&sz);
                      if (idx >= desc.mFaces.size())
                          desc.mFaces.resize(idx+1);
  
                      aiFace& face = desc.mFaces[idx];
                      face.mIndices = new unsigned int[face.mNumIndices = 3];
                      for (unsigned int i = 0; i < 3;++i) {
                          AI_MD5_SKIP_SPACES();
                          face.mIndices[i] = strtoul10(sz,&sz);
                      }
                  }
                  // weight attribute
                  // "weight 362 5 0.500000 ( -3.553583 11.893474 9.719339 )"
                  else if (TokenMatch(sz,"weight",6)) {
                      AI_MD5_SKIP_SPACES();
                      const unsigned int idx = strtoul10(sz,&sz);
                      AI_MD5_SKIP_SPACES();
                      if (idx >= desc.mWeights.size())
                          desc.mWeights.resize(idx+1);
  
                      WeightDesc& weight = desc.mWeights[idx];
                      weight.mBone = strtoul10(sz,&sz);
                      AI_MD5_SKIP_SPACES();
                      sz = fast_atoreal_move<float>(sz,weight.mWeight);
                      AI_MD5_READ_TRIPLE(weight.vOffsetPosition);
                  }
              }
          }
      }
      DefaultLogger::get()->debug("MD5MeshParser end");
  }
  
  // ------------------------------------------------------------------------------------------------
  // .MD5ANIM parsing function
  MD5AnimParser::MD5AnimParser(SectionList& mSections)
  {
      DefaultLogger::get()->debug("MD5AnimParser begin");
  
      fFrameRate = 24.0f;
      mNumAnimatedComponents = UINT_MAX;
      for (SectionList::const_iterator iter =  mSections.begin(), iterEnd = mSections.end();iter != iterEnd;++iter) {
          if ((*iter).mName == "hierarchy")   {
              // "sheath" 0 63 6
              for (const auto & elem : (*iter).mElements) {
                  mAnimatedBones.push_back ( AnimBoneDesc () );
                  AnimBoneDesc& desc = mAnimatedBones.back();
  
                  const char* sz = elem.szStart;
                  AI_MD5_PARSE_STRING_IN_QUOTATION(desc.mName);
                  AI_MD5_SKIP_SPACES();
  
                  // parent index - negative values are allowed (at least -1)
                  desc.mParentIndex = ::strtol10(sz,&sz);
  
                  // flags (highest is 2^6-1)
                  AI_MD5_SKIP_SPACES();
                  if(63 < (desc.iFlags = ::strtoul10(sz,&sz))){
                      MD5Parser::ReportWarning("Invalid flag combination in hierarchy section",elem.iLineNumber);
                  }
                  AI_MD5_SKIP_SPACES();
  
                  // index of the first animation keyframe component for this joint
                  desc.iFirstKeyIndex = ::strtoul10(sz,&sz);
              }
          }
          else if((*iter).mName == "baseframe")   {
              // ( -0.000000 0.016430 -0.006044 ) ( 0.707107 0.000242 0.707107 )
              for (const auto & elem : (*iter).mElements) {
                  const char* sz = elem.szStart;
  
                  mBaseFrames.push_back ( BaseFrameDesc () );
                  BaseFrameDesc& desc = mBaseFrames.back();
  
                  AI_MD5_READ_TRIPLE(desc.vPositionXYZ);
                  AI_MD5_READ_TRIPLE(desc.vRotationQuat);
              }
          }
          else if((*iter).mName ==  "frame")  {
              if (!(*iter).mGlobalValue.length()) {
                  MD5Parser::ReportWarning("A frame section must have a frame index",(*iter).iLineNumber);
                  continue;
              }
  
              mFrames.push_back ( FrameDesc () );
              FrameDesc& desc = mFrames.back();
              desc.iIndex = strtoul10((*iter).mGlobalValue.c_str());
  
              // we do already know how much storage we will presumably need
              if (UINT_MAX != mNumAnimatedComponents) {
                  desc.mValues.reserve(mNumAnimatedComponents);
              }
  
              // now read all elements (continuous list of floats)
              for (const auto & elem : (*iter).mElements){
                  const char* sz = elem.szStart;
                  while (SkipSpacesAndLineEnd(&sz))   {
                      float f;sz = fast_atoreal_move<float>(sz,f);
                      desc.mValues.push_back(f);
                  }
              }
          }
          else if((*iter).mName == "numFrames")   {
              mFrames.reserve(strtoul10((*iter).mGlobalValue.c_str()));
          }
          else if((*iter).mName == "numJoints")   {
              const unsigned int num = strtoul10((*iter).mGlobalValue.c_str());
              mAnimatedBones.reserve(num);
  
              // try to guess the number of animated components if that element is not given
              if (UINT_MAX  == mNumAnimatedComponents) {
                  mNumAnimatedComponents = num * 6;
              }
          }
          else if((*iter).mName == "numAnimatedComponents")   {
              mAnimatedBones.reserve( strtoul10((*iter).mGlobalValue.c_str()));
          }
          else if((*iter).mName == "frameRate")   {
              fast_atoreal_move<float>((*iter).mGlobalValue.c_str(),fFrameRate);
          }
      }
      DefaultLogger::get()->debug("MD5AnimParser end");
  }
  
  // ------------------------------------------------------------------------------------------------
  // .MD5CAMERA parsing function
  MD5CameraParser::MD5CameraParser(SectionList& mSections)
  {
      DefaultLogger::get()->debug("MD5CameraParser begin");
      fFrameRate = 24.0f;
  
      for (SectionList::const_iterator iter =  mSections.begin(), iterEnd = mSections.end();iter != iterEnd;++iter) {
          if ((*iter).mName == "numFrames")   {
              frames.reserve(strtoul10((*iter).mGlobalValue.c_str()));
          }
          else if ((*iter).mName == "frameRate")  {
              fFrameRate = fast_atof ((*iter).mGlobalValue.c_str());
          }
          else if ((*iter).mName == "numCuts")    {
              cuts.reserve(strtoul10((*iter).mGlobalValue.c_str()));
          }
          else if ((*iter).mName == "cuts")   {
              for (const auto & elem : (*iter).mElements){
                  cuts.push_back(strtoul10(elem.szStart)+1);
              }
          }
          else if ((*iter).mName == "camera") {
              for (const auto & elem : (*iter).mElements){
                  const char* sz = elem.szStart;
  
                  frames.push_back(CameraAnimFrameDesc());
                  CameraAnimFrameDesc& cur = frames.back();
                  AI_MD5_READ_TRIPLE(cur.vPositionXYZ);
                  AI_MD5_READ_TRIPLE(cur.vRotationQuat);
                  AI_MD5_SKIP_SPACES();
                  cur.fFOV = fast_atof(sz);
              }
          }
      }
      DefaultLogger::get()->debug("MD5CameraParser end");
  }
  
  