assimp/code/MDRLoader.cpp

/*
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Open Asset Import Library (ASSIMP)
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Copyright (c) 2006-2008, ASSIMP Development Team

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*/

/** @file Implementation of the MDR importer class */

// internal headers
#include "MDRLoader.h"
#include "MaterialSystem.h"
#include "StringComparison.h"
#include "ByteSwap.h"

// public ASSIMP headers
#include "../include/IOStream.h"
#include "../include/IOSystem.h"
#include "../include/aiScene.h"
#include "../include/aiAssert.h"
#include "../include/DefaultLogger.h"
#include "../include/assimp.hpp"

// boost headers
#include <boost/scoped_ptr.hpp>

using namespace Assimp;
using namespace Assimp::MDR;

// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
MDRImporter::MDRImporter()
{
}

// ------------------------------------------------------------------------------------------------
// Destructor, private as well 
MDRImporter::~MDRImporter()
{
}

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool MDRImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler) const
{
	// simple check of file extension is enough for the moment
	std::string::size_type pos = pFile.find_last_of('.');
	// no file extension - can't read
	if( pos == std::string::npos)
		return false;
	std::string extension = pFile.substr( pos);

	return !(extension.length() != 4 || extension[0] != '.' ||
			 extension[1] != 'm' && extension[1] != 'M' ||
			 extension[2] != 'd' && extension[2] != 'D' ||
			 extension[3] != 'r' && extension[3] != 'R');
}

// ------------------------------------------------------------------------------------------------
// Validate the header of the given MDR file
void MDRImporter::ValidateHeader()
{
	AI_SWAP4(pcLOD->version);
	AI_SWAP4(pcLOD->numBones);
	AI_SWAP4(pcLOD->numTags);
	AI_SWAP4(pcLOD->numFrames);
	AI_SWAP4(pcLOD->ofsFrames);
	AI_SWAP4(pcLOD->ofsTags);
	AI_SWAP4(pcLOD->numLODs);
	AI_SWAP4(pcLOD->ofsLODs);

	if (pcHeader->ident != AI_MDR_MAGIC_NUMBER_BE &&
		pcHeader->ident != AI_MDR_MAGIC_NUMBER_LE)
	{
		char szBuffer[5];
		szBuffer[0] = ((char*)&pcHeader->ident)[0];
		szBuffer[1] = ((char*)&pcHeader->ident)[1];
		szBuffer[2] = ((char*)&pcHeader->ident)[2];
		szBuffer[3] = ((char*)&pcHeader->ident)[3];
		szBuffer[4] = '\0';

		throw new ImportErrorException("Invalid MDR magic word: should be 5MDR, the "
			"magic word found is " + std::string( szBuffer ));
	}

	if (pcHeader->version != AI_MDR_VERSION)
		DefaultLogger::get()->warn("Unsupported MDR file version (2 (AI_MDR_VERSION) was expected)");

	if (!pcHeader->numBones)
		DefaultLogger::get()->warn("MDR: At least one bone must be there");

	// validate all LODs
	uint32_t cur = pcHeader->ofsLODs; 
	for (uint32_t i = 0; i < pcHeader->numLODs;++i)
	{
		if (cur + sizeof(MDR::LOD) > fileSize)
			throw new ImportErrorException("MDR: header is invalid - LOD out of range");

		BE_NCONST MDR::LOD* pcSurf = (BE_NCONST MDR::LOD*)((int8_t*)pcHeader + cur);
		ValidateLODHeader(pcSurf);
		cur = pcSurf->ofsEnd;
	}

	// validate all frames
	if (pcHeader->ofsFrames + sizeof(MDR::Frame) * (pcHeader->numBones-1) *
		sizeof(MDR::Bone) * pcHeader->numFrames > fileSize)
	{
		throw new ImportErrorException("MDR: header is invalid - frame out of range");
	}

	// check whether the requested frame is existing
	if (this->configFrameID >= pcHeader->numFrames)
		throw new ImportErrorException("The requested frame is not available");
}

// ------------------------------------------------------------------------------------------------
// Validate the header of a given MDR file LOD
void MDRImporter::ValidateLODHeader(BE_NCONST MDR::LOD* pcLOD)
{
	AI_SWAP4(pcLOD->ofsSurfaces);
	AI_SWAP4(pcLOD->numSurfaces);
	AI_SWAP4(pcLOD->ofsEnd);

    const unsigned int iMax = this->fileSize - (unsigned int)((int8_t*)pcLOD-(int8_t*)pcHeader);

	uint32_t cur = pcLOD->ofsSurfaces; 
	for (unsigned int i = 0; i < pcLOD->numSurfaces;++i)
	{
		if (cur + sizeof(MDR::Surface) > iMax)
			throw new ImportErrorException("MDR: LOD header is invalid");

		BE_NCONST MDR::Surface* pcSurf = (BE_NCONST MDR::Surface*)((int8_t*)pcLOD + cur);
		ValidateSurfaceHeader(pcSurf);
		cur = pcSurf->ofsEnd;
	}
}

// ------------------------------------------------------------------------------------------------
// Validate the header of a given MDR file surface
void MDRImporter::ValidateSurfaceHeader(BE_NCONST MDR::Surface* pcSurf)
{
	AI_SWAP4(pcSurf->ident);
	AI_SWAP4(pcSurf->numBoneReferences);
	AI_SWAP4(pcSurf->numTriangles);
	AI_SWAP4(pcSurf->numVerts);
	AI_SWAP4(pcSurf->ofsBoneReferences);
	AI_SWAP4(pcSurf->ofsEnd);
	AI_SWAP4(pcSurf->ofsTriangles);
	AI_SWAP4(pcSurf->ofsVerts);
	AI_SWAP4(pcSurf->shaderIndex);

    const unsigned int iMax = this->fileSize - (unsigned int)((int8_t*)pcSurf-(int8_t*)pcHeader);

	// not exact - there could be extra data in the vertices.
	if (pcSurf->ofsTriangles + pcSurf->numTriangles*sizeof(MDR::Triangle) > iMax ||
		pcSurf->ofsVerts + pcSurf->numVerts*sizeof(MDR::Vertex) > iMax)
    {
		throw new ImportErrorException("MDR: Surface header is invalid");
    }
}

// ------------------------------------------------------------------------------------------------
// Setup configuration properties
void MDRImporter::SetupProperties(const Importer* pImp)
{
	// The AI_CONFIG_IMPORT_MDR_KEYFRAME option overrides the
	//     AI_CONFIG_IMPORT_GLOBAL_KEYFRAME option.
	if(0xffffffff == (this->configFrameID = pImp->GetPropertyInteger(
		AI_CONFIG_IMPORT_MDR_KEYFRAME,0xffffffff)))
	{
		this->configFrameID = pImp->GetPropertyInteger(AI_CONFIG_IMPORT_GLOBAL_KEYFRAME,0);
	}
}

// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void MDRImporter::InternReadFile( 
	const std::string& pFile, aiScene* pScene, IOSystem* pIOHandler)
{
	boost::scoped_ptr<IOStream> file( pIOHandler->Open( pFile));

	// Check whether we can read from the file
	if( file.get() == NULL)
		throw new ImportErrorException( "Failed to open MDR file " + pFile + ".");

	// check whether the mdr file is large enough to contain the file header
	fileSize = (unsigned int)file->FileSize();
	if( fileSize < sizeof(MDR::Header))
		throw new ImportErrorException( "MDR File is too small.");

	std::vector<unsigned char> mBuffer2(fileSize);
	file->Read( &mBuffer2[0], 1, fileSize);
	mBuffer = &mBuffer2[0];

	// validate the file header
	this->pcHeader = (BE_NCONST MDR::Header*)this->mBuffer;
	this->ValidateHeader();
}