394 lines
12 KiB
C++
394 lines
12 KiB
C++
/*
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---------------------------------------------------------------------------
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Open Asset Import Library (ASSIMP)
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---------------------------------------------------------------------------
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Copyright (c) 2006-2008, ASSIMP Development Team
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All rights reserved.
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Redistribution and use of this software in source and binary forms,
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with or without modification, are permitted provided that the following
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conditions are met:
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* Redistributions of source code must retain the above
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copyright notice, this list of conditions and the
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following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the
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following disclaimer in the documentation and/or other
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materials provided with the distribution.
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* Neither the name of the ASSIMP team, nor the names of its
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contributors may be used to endorse or promote products
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derived from this software without specific prior
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written permission of the ASSIMP Development Team.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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---------------------------------------------------------------------------
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*/
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/** @file BaseImporter.cpp
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* @brief Implementation of BaseImporter
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*/
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#include "AssimpPCH.h"
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#include "BaseImporter.h"
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#include "FileSystemFilter.h"
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using namespace Assimp;
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// ------------------------------------------------------------------------------------------------
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// Constructor to be privately used by Importer
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BaseImporter::BaseImporter()
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{
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// nothing to do here
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}
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// ------------------------------------------------------------------------------------------------
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// Destructor, private as well
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BaseImporter::~BaseImporter()
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{
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// nothing to do here
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}
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// ------------------------------------------------------------------------------------------------
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// Imports the given file and returns the imported data.
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aiScene* BaseImporter::ReadFile( const std::string& pFile, IOSystem* pIOHandler)
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{
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// Construct a file system filter to improve our success ratio reading external files
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FileSystemFilter filter(pFile,pIOHandler);
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// create a scene object to hold the data
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aiScene* scene = new aiScene();
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// dispatch importing
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try
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{
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InternReadFile( pFile, scene, &filter);
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} catch( ImportErrorException* exception)
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{
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// extract error description
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mErrorText = exception->GetErrorText();
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DefaultLogger::get()->error(mErrorText);
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delete exception;
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// and kill the partially imported data
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delete scene;
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scene = NULL;
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}
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// return what we gathered from the import.
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return scene;
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}
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// ------------------------------------------------------------------------------------------------
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void BaseImporter::SetupProperties(const Importer* pImp)
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{
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// the default implementation does nothing
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}
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// ------------------------------------------------------------------------------------------------
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/*static*/ bool BaseImporter::SearchFileHeaderForToken(IOSystem* pIOHandler,
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const std::string& pFile,
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const char** tokens,
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unsigned int numTokens,
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unsigned int searchBytes /* = 200 */)
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{
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ai_assert(NULL != tokens && 0 != numTokens && NULL != pIOHandler && 0 != searchBytes);
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boost::scoped_ptr<IOStream> pStream (pIOHandler->Open(pFile));
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if (pStream.get() )
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{
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// read 200 characters from the file
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boost::scoped_array<char> _buffer (new char[searchBytes+1 /* for the '\0' */]);
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char* buffer = _buffer.get();
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unsigned int read = (unsigned int)pStream->Read(buffer,1,searchBytes);
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if (!read)return false;
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for (unsigned int i = 0; i < read;++i)
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buffer[i] = ::tolower(buffer[i]);
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// It is not a proper handling of unicode files here ...
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// ehm ... but it works in most cases.
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char* cur = buffer,*cur2 = buffer,*end = &buffer[read];
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while (cur != end)
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{
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if (*cur)*cur2++ = *cur;
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++cur;
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}
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*cur2 = '\0';
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for (unsigned int i = 0; i < numTokens;++i)
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{
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ai_assert(NULL != tokens[i]);
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if (::strstr(buffer,tokens[i]))
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{
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DefaultLogger::get()->debug(std::string("Found positive match for header keyword: ") + tokens[i]);
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return true;
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}
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}
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}
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return false;
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}
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// ------------------------------------------------------------------------------------------------
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// Simple check for file extension
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/*static*/ bool BaseImporter::SimpleExtensionCheck (const std::string& pFile,
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const char* ext0,
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const char* ext1,
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const char* ext2)
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{
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std::string::size_type pos = pFile.find_last_of('.');
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// no file extension - can't read
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if( pos == std::string::npos)
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return false;
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const char* ext_real = & pFile[ pos+1 ];
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if( !ASSIMP_stricmp(ext_real,ext0) )
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return true;
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// check for other, optional, file extensions
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if (ext1 && !ASSIMP_stricmp(ext_real,ext1))
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return true;
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if (ext2 && !ASSIMP_stricmp(ext_real,ext2))
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return true;
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return false;
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}
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// ------------------------------------------------------------------------------------------------
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// Get file extension from path
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/*static*/ std::string BaseImporter::GetExtension (const std::string& pFile)
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{
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std::string::size_type pos = pFile.find_last_of('.');
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// no file extension at all
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if( pos == std::string::npos)
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return "";
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std::string ret = pFile.substr(pos+1);
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std::transform(ret.begin(),ret.end(),ret.begin(),::tolower); // thanks to Andy Maloney for the hint
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return ret;
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}
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// ------------------------------------------------------------------------------------------------
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// Check for magic bytes at the beginning of the file.
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/* static */ bool BaseImporter::CheckMagicToken(IOSystem* pIOHandler, const std::string& pFile,
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const void* _magic, unsigned int num, unsigned int offset, unsigned int size)
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{
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ai_assert(size <= 16 && _magic && num && pIOHandler);
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const char* magic = (const char*)_magic;
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boost::scoped_ptr<IOStream> pStream (pIOHandler->Open(pFile));
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if (pStream.get() )
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{
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// skip to offset
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pStream->Seek(offset,aiOrigin_SET);
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// read 'size' characters from the file
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char data[16];
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if(size != pStream->Read(data,1,size))
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return false;
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for (unsigned int i = 0; i < num; ++i) {
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// also check against big endian versions of tokens with size 2,4
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// that's just for convinience, the chance that we cause conflicts
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// is quite low and it can save some lines and prevent nasty bugs
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if (2 == size) {
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int16_t rev = *((int16_t*)magic);
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ByteSwap::Swap(&rev);
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if (*((int16_t*)data) == ((int16_t*)magic)[i] || *((int16_t*)data) == rev)
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return true;
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}
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else if (4 == size) {
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int32_t rev = *((int32_t*)magic);
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ByteSwap::Swap(&rev);
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if (*((int32_t*)data) == ((int32_t*)magic)[i] || *((int32_t*)data) == rev)
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return true;
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}
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else {
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// any length ... just compare
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if(!::memcmp(magic,data,size))
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return true;
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}
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magic += size;
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}
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}
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return false;
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}
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// ------------------------------------------------------------------------------------------------
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// Represents an import request
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struct LoadRequest
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{
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LoadRequest(const std::string& _file, unsigned int _flags,const BatchLoader::PropertyMap* _map, unsigned int _id)
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: file (_file)
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, flags (_flags)
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, refCnt (1)
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, scene (NULL)
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, loaded (false)
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, id (_id)
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{
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if (_map)
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map = *_map;
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}
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const std::string file;
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unsigned int flags;
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unsigned int refCnt;
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aiScene* scene;
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bool loaded;
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BatchLoader::PropertyMap map;
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unsigned int id;
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bool operator== (const std::string& f) {
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return file == f;
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}
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};
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// ------------------------------------------------------------------------------------------------
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// BatchLoader::pimpl data structure
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struct Assimp::BatchData
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{
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BatchData()
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: next_id(0xffff)
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{}
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// IO system to be used for all imports
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IOSystem* pIOSystem;
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// Importer used to load all meshes
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Importer* pImporter;
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// List of all imports
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std::list<LoadRequest> requests;
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// Base path
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std::string pathBase;
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// Id for next item
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unsigned int next_id;
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};
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// ------------------------------------------------------------------------------------------------
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BatchLoader::BatchLoader(IOSystem* pIO)
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{
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ai_assert(NULL != pIO);
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data = new BatchData();
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data->pIOSystem = pIO;
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data->pImporter = new Importer();
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data->pImporter->SetIOHandler(data->pIOSystem);
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}
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// ------------------------------------------------------------------------------------------------
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BatchLoader::~BatchLoader()
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{
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// delete all scenes wthat have not been polled by the user
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for (std::list<LoadRequest>::iterator it = data->requests.begin();it != data->requests.end(); ++it) {
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delete (*it).scene;
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}
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data->pImporter->SetIOHandler(NULL); /* get pointer back into our posession */
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delete data->pImporter;
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delete data;
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}
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// ------------------------------------------------------------------------------------------------
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unsigned int BatchLoader::AddLoadRequest (const std::string& file,
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unsigned int steps /*= 0*/, const PropertyMap* map /*= NULL*/)
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{
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ai_assert(!file.empty());
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// check whether we have this loading request already
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std::list<LoadRequest>::iterator it;
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for (it = data->requests.begin();it != data->requests.end(); ++it) {
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// Call IOSystem's path comparison function here
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if (data->pIOSystem->ComparePaths((*it).file,file)) {
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if (map) {
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if (!((*it).map == *map))
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continue;
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}
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else if (!(*it).map.empty())
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continue;
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(*it).refCnt++;
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return (*it).id;
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}
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}
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// no, we don't have it. So add it to the queue ...
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data->requests.push_back(LoadRequest(file,steps,map,data->next_id));
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return data->next_id++;
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}
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// ------------------------------------------------------------------------------------------------
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aiScene* BatchLoader::GetImport (unsigned int which)
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{
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for (std::list<LoadRequest>::iterator it = data->requests.begin();it != data->requests.end(); ++it) {
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if ((*it).id == which && (*it).loaded) {
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aiScene* sc = (*it).scene;
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if (!(--(*it).refCnt)) {
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data->requests.erase(it);
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}
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return sc;
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}
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}
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return NULL;
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}
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// ------------------------------------------------------------------------------------------------
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void BatchLoader::LoadAll()
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{
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// no threaded implementation for the moment
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for (std::list<LoadRequest>::iterator it = data->requests.begin();it != data->requests.end(); ++it) {
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// force validation in debug builds
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unsigned int pp = (*it).flags;
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#ifdef _DEBUG
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pp |= aiProcess_ValidateDataStructure;
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#endif
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// setup config properties if necessary
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data->pImporter->pimpl->mFloatProperties = (*it).map.floats;
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data->pImporter->pimpl->mIntProperties = (*it).map.ints;
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data->pImporter->pimpl->mStringProperties = (*it).map.strings;
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if (!DefaultLogger::isNullLogger())
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{
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DefaultLogger::get()->info("%%% BEGIN EXTERNAL FILE %%%");
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DefaultLogger::get()->info("File: " + (*it).file);
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}
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data->pImporter->ReadFile((*it).file,pp);
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(*it).scene = const_cast<aiScene*>(data->pImporter->GetOrphanedScene());
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(*it).loaded = true;
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DefaultLogger::get()->info("%%% END EXTERNAL FILE %%%");
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}
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}
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