assimp/code/BaseImporter.cpp

397 lines
12 KiB
C++

/*
---------------------------------------------------------------------------
Open Asset Import Library (ASSIMP)
---------------------------------------------------------------------------
Copyright (c) 2006-2008, ASSIMP Development 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 Development 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 BaseImporter.cpp
* @brief Implementation of BaseImporter
*/
#include "AssimpPCH.h"
#include "BaseImporter.h"
#include "FileSystemFilter.h"
using namespace Assimp;
// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
BaseImporter::BaseImporter()
{
// nothing to do here
}
// ------------------------------------------------------------------------------------------------
// Destructor, private as well
BaseImporter::~BaseImporter()
{
// nothing to do here
}
// ------------------------------------------------------------------------------------------------
// Imports the given file and returns the imported data.
aiScene* BaseImporter::ReadFile( const std::string& pFile, IOSystem* pIOHandler)
{
// Construct a file system filter to improve our success ratio reading external files
FileSystemFilter filter(pFile,pIOHandler);
// create a scene object to hold the data
aiScene* scene = new aiScene();
// dispatch importing
try
{
InternReadFile( pFile, scene, &filter);
} catch( ImportErrorException* exception)
{
// extract error description
mErrorText = exception->GetErrorText();
DefaultLogger::get()->error(mErrorText);
delete exception;
// and kill the partially imported data
delete scene;
scene = NULL;
}
// return what we gathered from the import.
return scene;
}
// ------------------------------------------------------------------------------------------------
void BaseImporter::SetupProperties(const Importer* pImp)
{
// the default implementation does nothing
}
// ------------------------------------------------------------------------------------------------
/*static*/ bool BaseImporter::SearchFileHeaderForToken(IOSystem* pIOHandler,
const std::string& pFile,
const char** tokens,
unsigned int numTokens,
unsigned int searchBytes /* = 200 */)
{
ai_assert(NULL != tokens && 0 != numTokens && 0 != searchBytes);
if (!pIOHandler)
return false;
boost::scoped_ptr<IOStream> pStream (pIOHandler->Open(pFile));
if (pStream.get() ) {
// read 200 characters from the file
boost::scoped_array<char> _buffer (new char[searchBytes+1 /* for the '\0' */]);
char* buffer = _buffer.get();
unsigned int read = (unsigned int)pStream->Read(buffer,1,searchBytes);
if (!read)return false;
for (unsigned int i = 0; i < read;++i)
buffer[i] = ::tolower(buffer[i]);
// It is not a proper handling of unicode files here ...
// ehm ... but it works in most cases.
char* cur = buffer,*cur2 = buffer,*end = &buffer[read];
while (cur != end) {
if (*cur)
*cur2++ = *cur;
++cur;
}
*cur2 = '\0';
for (unsigned int i = 0; i < numTokens;++i) {
ai_assert(NULL != tokens[i]);
if (::strstr(buffer,tokens[i])) {
DefaultLogger::get()->debug(std::string("Found positive match for header keyword: ") + tokens[i]);
return true;
}
}
}
return false;
}
// ------------------------------------------------------------------------------------------------
// Simple check for file extension
/*static*/ bool BaseImporter::SimpleExtensionCheck (const std::string& pFile,
const char* ext0,
const char* ext1,
const char* ext2)
{
std::string::size_type pos = pFile.find_last_of('.');
// no file extension - can't read
if( pos == std::string::npos)
return false;
const char* ext_real = & pFile[ pos+1 ];
if( !ASSIMP_stricmp(ext_real,ext0) )
return true;
// check for other, optional, file extensions
if (ext1 && !ASSIMP_stricmp(ext_real,ext1))
return true;
if (ext2 && !ASSIMP_stricmp(ext_real,ext2))
return true;
return false;
}
// ------------------------------------------------------------------------------------------------
// Get file extension from path
/*static*/ std::string BaseImporter::GetExtension (const std::string& pFile)
{
std::string::size_type pos = pFile.find_last_of('.');
// no file extension at all
if( pos == std::string::npos)
return "";
std::string ret = pFile.substr(pos+1);
std::transform(ret.begin(),ret.end(),ret.begin(),::tolower); // thanks to Andy Maloney for the hint
return ret;
}
// ------------------------------------------------------------------------------------------------
// Check for magic bytes at the beginning of the file.
/* static */ bool BaseImporter::CheckMagicToken(IOSystem* pIOHandler, const std::string& pFile,
const void* _magic, unsigned int num, unsigned int offset, unsigned int size)
{
ai_assert(size <= 16 && _magic);
if (!pIOHandler)
return false;
const char* magic = (const char*)_magic;
boost::scoped_ptr<IOStream> pStream (pIOHandler->Open(pFile));
if (pStream.get() ) {
// skip to offset
pStream->Seek(offset,aiOrigin_SET);
// read 'size' characters from the file
char data[16];
if(size != pStream->Read(data,1,size))
return false;
for (unsigned int i = 0; i < num; ++i) {
// also check against big endian versions of tokens with size 2,4
// that's just for convinience, the chance that we cause conflicts
// is quite low and it can save some lines and prevent nasty bugs
if (2 == size) {
int16_t rev = *((int16_t*)magic);
ByteSwap::Swap(&rev);
if (*((int16_t*)data) == ((int16_t*)magic)[i] || *((int16_t*)data) == rev)
return true;
}
else if (4 == size) {
int32_t rev = *((int32_t*)magic);
ByteSwap::Swap(&rev);
if (*((int32_t*)data) == ((int32_t*)magic)[i] || *((int32_t*)data) == rev)
return true;
}
else {
// any length ... just compare
if(!::memcmp(magic,data,size))
return true;
}
magic += size;
}
}
return false;
}
// ------------------------------------------------------------------------------------------------
// Represents an import request
struct LoadRequest
{
LoadRequest(const std::string& _file, unsigned int _flags,const BatchLoader::PropertyMap* _map, unsigned int _id)
: file (_file)
, flags (_flags)
, refCnt (1)
, scene (NULL)
, loaded (false)
, id (_id)
{
if (_map)
map = *_map;
}
const std::string file;
unsigned int flags;
unsigned int refCnt;
aiScene* scene;
bool loaded;
BatchLoader::PropertyMap map;
unsigned int id;
bool operator== (const std::string& f) {
return file == f;
}
};
// ------------------------------------------------------------------------------------------------
// BatchLoader::pimpl data structure
struct Assimp::BatchData
{
BatchData()
: next_id(0xffff)
{}
// IO system to be used for all imports
IOSystem* pIOSystem;
// Importer used to load all meshes
Importer* pImporter;
// List of all imports
std::list<LoadRequest> requests;
// Base path
std::string pathBase;
// Id for next item
unsigned int next_id;
};
// ------------------------------------------------------------------------------------------------
BatchLoader::BatchLoader(IOSystem* pIO)
{
ai_assert(NULL != pIO);
data = new BatchData();
data->pIOSystem = pIO;
data->pImporter = new Importer();
data->pImporter->SetIOHandler(data->pIOSystem);
}
// ------------------------------------------------------------------------------------------------
BatchLoader::~BatchLoader()
{
// delete all scenes wthat have not been polled by the user
for (std::list<LoadRequest>::iterator it = data->requests.begin();it != data->requests.end(); ++it) {
delete (*it).scene;
}
data->pImporter->SetIOHandler(NULL); /* get pointer back into our posession */
delete data->pImporter;
delete data;
}
// ------------------------------------------------------------------------------------------------
unsigned int BatchLoader::AddLoadRequest (const std::string& file,
unsigned int steps /*= 0*/, const PropertyMap* map /*= NULL*/)
{
ai_assert(!file.empty());
// check whether we have this loading request already
std::list<LoadRequest>::iterator it;
for (it = data->requests.begin();it != data->requests.end(); ++it) {
// Call IOSystem's path comparison function here
if (data->pIOSystem->ComparePaths((*it).file,file)) {
if (map) {
if (!((*it).map == *map))
continue;
}
else if (!(*it).map.empty())
continue;
(*it).refCnt++;
return (*it).id;
}
}
// no, we don't have it. So add it to the queue ...
data->requests.push_back(LoadRequest(file,steps,map,data->next_id));
return data->next_id++;
}
// ------------------------------------------------------------------------------------------------
aiScene* BatchLoader::GetImport (unsigned int which)
{
for (std::list<LoadRequest>::iterator it = data->requests.begin();it != data->requests.end(); ++it) {
if ((*it).id == which && (*it).loaded) {
aiScene* sc = (*it).scene;
if (!(--(*it).refCnt)) {
data->requests.erase(it);
}
return sc;
}
}
return NULL;
}
// ------------------------------------------------------------------------------------------------
void BatchLoader::LoadAll()
{
// no threaded implementation for the moment
for (std::list<LoadRequest>::iterator it = data->requests.begin();it != data->requests.end(); ++it) {
// force validation in debug builds
unsigned int pp = (*it).flags;
#ifdef _DEBUG
pp |= aiProcess_ValidateDataStructure;
#endif
// setup config properties if necessary
data->pImporter->pimpl->mFloatProperties = (*it).map.floats;
data->pImporter->pimpl->mIntProperties = (*it).map.ints;
data->pImporter->pimpl->mStringProperties = (*it).map.strings;
if (!DefaultLogger::isNullLogger())
{
DefaultLogger::get()->info("%%% BEGIN EXTERNAL FILE %%%");
DefaultLogger::get()->info("File: " + (*it).file);
}
data->pImporter->ReadFile((*it).file,pp);
(*it).scene = const_cast<aiScene*>(data->pImporter->GetOrphanedScene());
(*it).loaded = true;
DefaultLogger::get()->info("%%% END EXTERNAL FILE %%%");
}
}