assimp/tools/assimp_cmd/CompareDump.cpp

/*
---------------------------------------------------------------------------
Open Asset Import Library (assimp)
---------------------------------------------------------------------------

Copyright (c) 2006-2012, 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 
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* 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
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  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the assimp team.

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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/

/** @file  CompareDump.cpp
 *  @brief Implementation of the 'assimp cmpdmp', which compares
 *    two model dumps for equality. It plays an important role
 *    in the regression test suite.
 */

#include "Main.h"
const char* AICMD_MSG_CMPDUMP_HELP = 
"assimp cmpdump <actual> <expected>\n"
"\tCompare two short dumps produced with \'assimp dump <..> -s\' for equality.\n"
;

#include "../../code/assbin_chunks.h"

////////////////////////////////////////////////////////////////////////////////////////////////////
#include "generic_inserter.hpp"

// get << for aiString
template <typename char_t, typename traits_t>
void mysprint(std::basic_ostream<char_t, traits_t>& os,  const aiString& vec)	{
	os << "[length: \'" << std::dec << vec.length << "\' content: \'"  << vec.data << "\']";
}

template <typename char_t, typename traits_t>
std::basic_ostream<char_t, traits_t>& operator<< (std::basic_ostream<char_t, traits_t>& os, const aiString& vec)	{
	return generic_inserter(mysprint<char_t,traits_t>, os, vec);
}

class sliced_chunk_iterator;
////////////////////////////////////////////////////////////////////////////////////////////////////
/// @class	compare_fails_exception
///
/// @brief	Sentinel exception to return quickly from deeply nested control paths
////////////////////////////////////////////////////////////////////////////////////////////////////
class compare_fails_exception : public virtual std::exception {
public:

	enum {MAX_ERR_LEN = 4096};

	/* public c'tors */
	compare_fails_exception(const char* msg) {	
		strncpy(mywhat,msg,MAX_ERR_LEN-1);
		strcat(mywhat,"\n");
	}

	/* public member functions */
	const char* what() const throw() {
		return mywhat;
	}

private:
	
	char mywhat[MAX_ERR_LEN+1];
};


#define MY_FLT_EPSILON 1e-1f
#define MY_DBL_EPSILON 1e-1
////////////////////////////////////////////////////////////////////////////////////////////////////
/// @class	comparer_context
///
/// @brief	Record our way through the files to be compared and dump useful information if we fail.
////////////////////////////////////////////////////////////////////////////////////////////////////
class comparer_context {
	friend class sliced_chunk_iterator;

public:

	/* construct given two file handles to compare */
	comparer_context(FILE* actual,FILE* expect)
		: actual(actual)
		, expect(expect)
		, cnt_chunks(0)
	{
		ai_assert(actual);
		ai_assert(expect);

		fseek(actual,0,SEEK_END);
		lengths.push(std::make_pair(static_cast<uint32_t>(ftell(actual)),0));
		fseek(actual,0,SEEK_SET);

		history.push_back(HistoryEntry("---",PerChunkCounter()));
	}

public:


	/* set new scope */
	void push_elem(const char* msg) {
		const std::string s = msg;

		PerChunkCounter::const_iterator it = history.back().second.find(s);
		if(it != history.back().second.end()) {
			++history.back().second[s];
		}
		else history.back().second[s] = 1;

		history.push_back(HistoryEntry(s,PerChunkCounter()));

	}

	/* leave current scope */
	void pop_elem() {
		ai_assert(history.size());
		history.pop_back();
	}


	/* push current chunk length and start offset on top of stack */
	void push_length(uint32_t nl, uint32_t start) {
		lengths.push(std::make_pair(nl,start));
		++cnt_chunks;
	}

	/* pop the chunk length stack */
	void pop_length() {
		ai_assert(lengths.size());
		lengths.pop();
	}

	/* access the current chunk length */
	uint32_t get_latest_chunk_length() {
		ai_assert(lengths.size());
		return lengths.top().first;
	}

	/* access the current chunk start offset */
	uint32_t get_latest_chunk_start() {
		ai_assert(lengths.size());
		return lengths.top().second;
	}

	/* total number of chunk headers passed so far*/
	uint32_t get_num_chunks() {
		return cnt_chunks;
	}


	/* get ACTUAL file desc. != NULL */
	FILE* get_actual() const {
		return actual;
	}

	/* get EXPECT file desc. != NULL */
	FILE* get_expect() const {
		return expect;
	}


	/* compare next T from both streams, name occurs in error messages */
	template<typename T> T cmp(const std::string& name) {
		T a,e;
		read(a,e);

		if(a != e) {
			std::stringstream ss;
			failure((ss<< "Expected " << e << ", but actual is " << a,
				ss.str()),name);
		}
	//	std::cout << name << " " << std::hex << a << std::endl;
		return a;
	}

	/* compare next num T's from both streams, name occurs in error messages */
	template<typename T> void cmp(size_t num,const std::string& name) {
		for(size_t n = 0; n < num; ++n) {
			std::stringstream ss;
			cmp<T>((ss<<name<<"["<<n<<"]",ss.str()));
	//		std::cout << name << " " << std::hex << a << std::endl;
		}
	}

	/* Bounds of an aiVector3D array (separate function
	 *  because partial specializations of member functions are illegal--)*/
	template<typename T> void cmp_bounds(const std::string& name) {
		cmp<T> (name+".<minimum-value>");
		cmp<T> (name+".<maximum-value>");
	}

private:

	/* Report failure */
	void failure(const std::string& err, const std::string& name) {
		std::stringstream ss;
		throw compare_fails_exception((ss
			<< "Files are different at " 
			<< history.back().first
			<< "."
			<< name
			<< ".\nError is: "
			<< err
			<< ".\nCurrent position in scene hierarchy is "
			<< print_hierarchy(),ss.str().c_str()
			));
	}

	/** print our 'stack' */
	std::string print_hierarchy() {
		std::stringstream ss;
		ss << std::endl;

		const char* last = history.back().first.c_str();
		std::string pad;

		for(ChunkHistory::reverse_iterator rev = ++history.rbegin(),
			end = history.rend(); rev < end; ++rev, pad += "  ")
		{
			ss << pad << (*rev).first << "(Index: " << (*rev).second[last]-1 << ")" << std::endl;
			last = (*rev).first.c_str();
		}

		return ss.str();
	}


	/* read from both streams simult.*/
	template <typename T> void read(T& filla,T& fille) {
		if(1 != fread(&filla,sizeof(T),1,actual)) {
			throw compare_fails_exception("Unexpected EOF reading ACTUAL");
		}
		if(1 != fread(&fille,sizeof(T),1,expect)) {
			throw compare_fails_exception("Unexpected EOF reading EXPECT");
		}
	}


private:

	FILE *const actual, *const expect;

	typedef std::map<std::string,unsigned int> PerChunkCounter;
	typedef std::pair<std::string,PerChunkCounter> HistoryEntry;

	typedef std::deque<HistoryEntry> ChunkHistory;
	ChunkHistory history;

	typedef std::stack<std::pair<uint32_t,uint32_t> > LengthStack;
	LengthStack lengths;

	uint32_t cnt_chunks;
};


////////////////////////////////////////////////////////////////////////////////////////////////////
/* specialization for aiString (it needs separate handling because its on-disk representation
 * differs from its binary representation in memory and can't be treated as an array of n T's.*/
template <> void comparer_context :: read<aiString>(aiString& filla,aiString& fille) {
	uint32_t lena,lene;
	read(lena,lene);

	if(lena && 1 != fread(&filla.data,lena,1,actual)) {
		throw compare_fails_exception("Unexpected EOF reading ACTUAL");
	}
	if(lene && 1 != fread(&fille.data,lene,1,expect)) {
		throw compare_fails_exception("Unexpected EOF reading ACTUAL");
	}

	fille.data[fille.length=static_cast<unsigned int>(lene)] = '\0';
	filla.data[filla.length=static_cast<unsigned int>(lena)] = '\0';
}

////////////////////////////////////////////////////////////////////////////////////////////////////
/* Specialization for float, uses epsilon for comparisons*/
template<> float comparer_context :: cmp<float>(const std::string& name) 
{
	float a,e,t;
	read(a,e);

	if((t=fabs(a-e)) > MY_FLT_EPSILON) {
		std::stringstream ss;
		failure((ss<< "Expected " << e << ", but actual is " 
			<< a << " (delta is " << t << ")", ss.str()),name);
	}
	return a;
}

////////////////////////////////////////////////////////////////////////////////////////////////////
/* Specialization for double, uses epsilon for comparisons*/
template<> double comparer_context :: cmp<double>(const std::string& name) 
{
	double a,e,t;
	read(a,e);

	if((t=fabs(a-e)) > MY_DBL_EPSILON) {
		std::stringstream ss;
		failure((ss<< "Expected " << e << ", but actual is " 
			<< a << " (delta is " << t << ")", ss.str()),name);
	}
	return a;
}

////////////////////////////////////////////////////////////////////////////////////////////////////
/* Specialization for aiVector3D */
template<> aiVector3D comparer_context :: cmp<aiVector3D >(const std::string& name) 
{
	const float x = cmp<float>(name+".x");
	const float y = cmp<float>(name+".y");
	const float z = cmp<float>(name+".z");

	return aiVector3D(x,y,z);
}

////////////////////////////////////////////////////////////////////////////////////////////////////
/* Specialization for aiColor4D */
template<> aiColor4D comparer_context :: cmp<aiColor4D >(const std::string& name) 
{
	const float r = cmp<float>(name+".r");
	const float g = cmp<float>(name+".g");
	const float b = cmp<float>(name+".b");
	const float a = cmp<float>(name+".a");

	return aiColor4D(r,g,b,a);
}

////////////////////////////////////////////////////////////////////////////////////////////////////
/* Specialization for aiQuaternion */
template<> aiQuaternion comparer_context :: cmp<aiQuaternion >(const std::string& name) 
{
	const float w = cmp<float>(name+".w");
	const float x = cmp<float>(name+".x");
	const float y = cmp<float>(name+".y");
	const float z = cmp<float>(name+".z");

	return aiQuaternion(w,x,y,z);
}

////////////////////////////////////////////////////////////////////////////////////////////////////
/* Specialization for aiQuatKey */
template<> aiQuatKey comparer_context :: cmp<aiQuatKey >(const std::string& name) 
{
	const double mTime = cmp<double>(name+".mTime");
	const aiQuaternion mValue = cmp<aiQuaternion>(name+".mValue");

	return aiQuatKey(mTime,mValue);
}

////////////////////////////////////////////////////////////////////////////////////////////////////
/* Specialization for aiVectorKey */
template<> aiVectorKey comparer_context :: cmp<aiVectorKey >(const std::string& name) 
{
	const double mTime = cmp<double>(name+".mTime");
	const aiVector3D mValue = cmp<aiVector3D>(name+".mValue");

	return aiVectorKey(mTime,mValue);
}

////////////////////////////////////////////////////////////////////////////////////////////////////
/* Specialization for aiMatrix4x4 */
template<> aiMatrix4x4 comparer_context :: cmp<aiMatrix4x4 >(const std::string& name) 
{
	aiMatrix4x4 res;
	for(unsigned int i = 0; i < 4; ++i) {
		for(unsigned int j = 0; j < 4; ++j) {
			std::stringstream ss;
			res[i][j] = cmp<float>(name+(ss<<".m"<<i<<j,ss.str()));
		}
	}

	return res;
}

////////////////////////////////////////////////////////////////////////////////////////////////////
/* Specialization for aiVertexWeight */
template<> aiVertexWeight comparer_context :: cmp<aiVertexWeight >(const std::string& name) 
{
	const unsigned int mVertexId = cmp<unsigned int>(name+".mVertexId");
	const float mWeight = cmp<float>(name+".mWeight");

	return aiVertexWeight(mVertexId,mWeight);
}

////////////////////////////////////////////////////////////////////////////////////////////////////
/// @class	sliced_chunk_iterator
///
/// @brief	Helper to iterate easily through corresponding chunks of two dumps simultaneously.
///   
/// Not a *real* iterator, doesn't fully conform to the isocpp iterator spec
////////////////////////////////////////////////////////////////////////////////////////////////////
class sliced_chunk_iterator	{

	friend class sliced_chunk_reader;
	sliced_chunk_iterator(comparer_context& ctx, long end)
		: ctx(ctx)
		, endit(false)
		, next(std::numeric_limits<long>::max())
		, end(end)
	{
		load_next();
	}

public:

	~sliced_chunk_iterator() {
		fseek(ctx.get_actual(),end,SEEK_SET);
		fseek(ctx.get_expect(),end,SEEK_SET);
	}

public:

	/* get current chunk head */
	typedef std::pair<uint32_t,uint32_t> Chunk;
	const Chunk& operator*() {
		return current;
	}

	/* get to next chunk head */
	const sliced_chunk_iterator& operator++() {
		cleanup();
		load_next();
		return *this;
	}
	
	/* */
	bool is_end() const {
		return endit;
	}

private:

	/* get to the end of *this* chunk */
	void cleanup() {
		if(next != std::numeric_limits<long>::max()) {
			fseek(ctx.get_actual(),next,SEEK_SET);
			fseek(ctx.get_expect(),next,SEEK_SET);

			ctx.pop_length();
		}
	}

	/* advance to the next chunk */
	void load_next() {

		Chunk actual;
		size_t res=0;

		const long cur = ftell(ctx.get_expect());
		if(end-cur<8) {
			current = std::make_pair(0u,0u);
			endit = true;
			return;
		}
		
		res|=fread(&current.first,4,1,ctx.get_expect());
		res|=fread(&current.second,4,1,ctx.get_expect())	<<1u;
		res|=fread(&actual.first,4,1,ctx.get_actual())		<<2u;
		res|=fread(&actual.second,4,1,ctx.get_actual())		<<3u;

		if(res!=0xf) {
			ctx.failure("I/OError reading chunk head, dumps are not well-defined","<ChunkHead>");
		}

		if (current.first != actual.first) {
			std::stringstream ss;
			ctx.failure((ss
				<<"Chunk headers do not match. EXPECT: "
				<< std::hex << current.first
				<<" ACTUAL: " 
				<< /*std::hex */actual.first,
				ss.str()),
				"<ChunkHead>");
		}

		if (current.first != actual.first) {
			std::stringstream ss;
			ctx.failure((ss
				<<"Chunk lenghts do not match. EXPECT: "
				<<current.second
				<<" ACTUAL: " 
				<< actual.second,
				ss.str()),
				"<ChunkHead>");
		}

		next = cur+current.second+8;
		ctx.push_length(current.second,cur+8);
	}

	comparer_context& ctx;
	Chunk current;
	bool endit;
	long next,end;
};

////////////////////////////////////////////////////////////////////////////////////////////////////
/// @class	sliced_chunk_reader
///
/// @brief	Helper to iterate easily through corresponding chunks of two dumps simultaneously.
////////////////////////////////////////////////////////////////////////////////////////////////////
class sliced_chunk_reader  {
public:

	//
	sliced_chunk_reader(comparer_context& ctx)
		: ctx(ctx)
	{}

	//
	~sliced_chunk_reader() {
	}

public:

	sliced_chunk_iterator begin() const {
		return sliced_chunk_iterator(ctx,ctx.get_latest_chunk_length()+
			ctx.get_latest_chunk_start());
	}

private:
	
	comparer_context& ctx;
};

////////////////////////////////////////////////////////////////////////////////////////////////////
/// @class	scoped_chunk
///
/// @brief	Utility to simplify usage of comparer_context.push_elem/pop_elem
////////////////////////////////////////////////////////////////////////////////////////////////////
class scoped_chunk {
public:

	//
	scoped_chunk(comparer_context& ctx,const char* msg) 
		: ctx(ctx)
	{
		ctx.push_elem(msg);
	}

	// 
	~scoped_chunk()
	{
		ctx.pop_elem();
	}

private:

	comparer_context& ctx;
};

////////////////////////////////////////////////////////////////////////////////////////////////////
void CompareOnTheFlyMaterialProperty(comparer_context& comp)	{
	scoped_chunk chunk(comp,"aiMaterialProperty");

	comp.cmp<aiString>("mKey");
	comp.cmp<uint32_t>("mSemantic");
	comp.cmp<uint32_t>("mIndex");
	const uint32_t length = comp.cmp<uint32_t>("mDataLength");
	const aiPropertyTypeInfo type = static_cast<aiPropertyTypeInfo>(
		comp.cmp<uint32_t>("mType"));

	switch (type) 
	{
		case aiPTI_Float:
			comp.cmp<float>(length/4,"mData");
			break;

		case aiPTI_String:
			comp.cmp<aiString>("mData");
			break;

		case aiPTI_Integer:
			comp.cmp<uint32_t>(length/4,"mData");
			break;

		case aiPTI_Buffer:
			comp.cmp<uint8_t>(length,"mData");
			break;

		default:
			break;
	};
}

////////////////////////////////////////////////////////////////////////////////////////////////////
void CompareOnTheFlyMaterial(comparer_context& comp)	{
	scoped_chunk chunk(comp,"aiMaterial");

	comp.cmp<uint32_t>("aiMaterial::mNumProperties");
	sliced_chunk_reader reader(comp);
	for(sliced_chunk_iterator it = reader.begin(); !it.is_end(); ++it) {
		if ((*it).first == ASSBIN_CHUNK_AIMATERIALPROPERTY) {
			CompareOnTheFlyMaterialProperty(comp);
		}
	}
}

////////////////////////////////////////////////////////////////////////////////////////////////////
void CompareOnTheFlyBone(comparer_context& comp)	{
	scoped_chunk chunk(comp,"aiBone");
	comp.cmp<aiString>("mName");
	comp.cmp<uint32_t>("mNumWeights");
	comp.cmp<aiMatrix4x4>("mOffsetMatrix");

	comp.cmp_bounds<aiVertexWeight>("mWeights");
}

////////////////////////////////////////////////////////////////////////////////////////////////////
void CompareOnTheFlyNodeAnim(comparer_context& comp)	{
	scoped_chunk chunk(comp,"aiNodeAnim");

	comp.cmp<aiString>("mNodeName");
	comp.cmp<uint32_t>("mNumPositionKeys");
	comp.cmp<uint32_t>("mNumRotationKeys");
	comp.cmp<uint32_t>("mNumScalingKeys");
	comp.cmp<uint32_t>("mPreState");
	comp.cmp<uint32_t>("mPostState");

	comp.cmp_bounds<aiVectorKey>("mPositionKeys");
	comp.cmp_bounds<aiQuatKey>("mRotationKeys");
	comp.cmp_bounds<aiVectorKey>("mScalingKeys");
}

////////////////////////////////////////////////////////////////////////////////////////////////////
void CompareOnTheFlyMesh(comparer_context& comp)	{
	scoped_chunk chunk(comp,"aiMesh");

	comp.cmp<uint32_t>("mPrimitiveTypes");
	comp.cmp<uint32_t>("mNumVertices");
	const uint32_t nf = comp.cmp<uint32_t>("mNumFaces");
	comp.cmp<uint32_t>("mNumBones");
	comp.cmp<uint32_t>("mMaterialIndex");

	const uint32_t present = comp.cmp<uint32_t>("<vertex-components-present>");
	if(present & ASSBIN_MESH_HAS_POSITIONS) {
		comp.cmp_bounds<aiVector3D>("mVertices");
	}

	if(present & ASSBIN_MESH_HAS_NORMALS) {
		comp.cmp_bounds<aiVector3D>("mNormals");
	}

	if(present & ASSBIN_MESH_HAS_TANGENTS_AND_BITANGENTS) {
		comp.cmp_bounds<aiVector3D>("mTangents");
		comp.cmp_bounds<aiVector3D>("mBitangents");
	}

	for(unsigned int i = 0; present & ASSBIN_MESH_HAS_COLOR(i); ++i) {
		std::stringstream ss;
		comp.cmp_bounds<aiColor4D>((ss<<"mColors["<<i<<"]",ss.str()));
	}

	for(unsigned int i = 0; present & ASSBIN_MESH_HAS_TEXCOORD(i); ++i) {
		std::stringstream ss;
		comp.cmp<uint32_t>((ss<<"mNumUVComponents["<<i<<"]",ss.str()));
		comp.cmp_bounds<aiVector3D>((ss.clear(),ss<<"mTextureCoords["<<i<<"]",ss.str()));
	}

	for(unsigned int i = 0; i< ((nf+511)/512); ++i) {
		std::stringstream ss;
		comp.cmp<uint32_t>((ss<<"mFaces["<<i*512<<"-"<<std::min(static_cast<
			uint32_t>((i+1)*512),nf)<<"]",ss.str()));
	}

	sliced_chunk_reader reader(comp);
	for(sliced_chunk_iterator it = reader.begin(); !it.is_end(); ++it) {
		if ((*it).first == ASSBIN_CHUNK_AIBONE) {
			CompareOnTheFlyBone(comp);
		}
	}
}

////////////////////////////////////////////////////////////////////////////////////////////////////
void CompareOnTheFlyCamera(comparer_context& comp)	{
	scoped_chunk chunk(comp,"aiCamera");

	comp.cmp<aiString>("mName");

	comp.cmp<aiVector3D>("mPosition");
	comp.cmp<aiVector3D>("mLookAt");
	comp.cmp<aiVector3D>("mUp");

	comp.cmp<float>("mHorizontalFOV");
	comp.cmp<float>("mClipPlaneNear");
	comp.cmp<float>("mClipPlaneFar");
	comp.cmp<float>("mAspect");
}

////////////////////////////////////////////////////////////////////////////////////////////////////
void CompareOnTheFlyLight(comparer_context& comp)	{
	scoped_chunk chunk(comp,"aiLight");

	comp.cmp<aiString>("mName");
	const aiLightSourceType type = static_cast<aiLightSourceType>( 
		comp.cmp<uint32_t>("mType"));

	if(type==aiLightSource_DIRECTIONAL) {
		comp.cmp<float>("mAttenuationConstant");
		comp.cmp<float>("mAttenuationLinear");
		comp.cmp<float>("mAttenuationQuadratic");
	}

	comp.cmp<aiVector3D>("mColorDiffuse");
	comp.cmp<aiVector3D>("mColorSpecular");
	comp.cmp<aiVector3D>("mColorAmbient");

	if(type==aiLightSource_SPOT) {
		comp.cmp<float>("mAngleInnerCone");
		comp.cmp<float>("mAngleOuterCone");
	}
}

////////////////////////////////////////////////////////////////////////////////////////////////////
void CompareOnTheFlyAnimation(comparer_context& comp)	{
	scoped_chunk chunk(comp,"aiAnimation");

	comp.cmp<aiString>("mName");
	comp.cmp<double>("mDuration");
	comp.cmp<double>("mTicksPerSecond");
	comp.cmp<uint32_t>("mNumChannels");

	sliced_chunk_reader reader(comp);
	for(sliced_chunk_iterator it = reader.begin(); !it.is_end(); ++it) {
		if ((*it).first == ASSBIN_CHUNK_AINODEANIM) {
			CompareOnTheFlyNodeAnim(comp);
		}
	}
}

////////////////////////////////////////////////////////////////////////////////////////////////////
void CompareOnTheFlyTexture(comparer_context& comp)	{
	scoped_chunk chunk(comp,"aiTexture");

	const uint32_t w = comp.cmp<uint32_t>("mWidth");
	const uint32_t h = comp.cmp<uint32_t>("mHeight");
	(void)w; (void)h;
	comp.cmp<char>("achFormatHint[0]");
	comp.cmp<char>("achFormatHint[1]");
	comp.cmp<char>("achFormatHint[2]");
	comp.cmp<char>("achFormatHint[3]");
}

////////////////////////////////////////////////////////////////////////////////////////////////////
void CompareOnTheFlyNode(comparer_context& comp)	{
	scoped_chunk chunk(comp,"aiNode");
	comp.cmp<aiString>("mName");
	comp.cmp<aiMatrix4x4>("mTransformation");
	comp.cmp<uint32_t>("mNumChildren");
	comp.cmp<uint32_t>(comp.cmp<uint32_t>("mNumMeshes"),"mMeshes");

	sliced_chunk_reader reader(comp);
	for(sliced_chunk_iterator it = reader.begin(); !it.is_end(); ++it) {
		if ((*it).first == ASSBIN_CHUNK_AINODE) {
			CompareOnTheFlyNode(comp);
		}
	}
}

////////////////////////////////////////////////////////////////////////////////////////////////////
void CompareOnTheFlyScene(comparer_context& comp)	{
	scoped_chunk chunk(comp,"aiScene");

	comp.cmp<uint32_t>("mFlags");
	comp.cmp<uint32_t>("mNumMeshes");
	comp.cmp<uint32_t>("mNumMaterials");
	comp.cmp<uint32_t>("mNumAnimations");
	comp.cmp<uint32_t>("mNumTextures");
	comp.cmp<uint32_t>("mNumLights");
	comp.cmp<uint32_t>("mNumCameras");

	sliced_chunk_reader reader(comp);
	for(sliced_chunk_iterator it = reader.begin(); !it.is_end(); ++it) {
		if ((*it).first == ASSBIN_CHUNK_AIMATERIAL) {
			CompareOnTheFlyMaterial(comp);
		}
		else if ((*it).first == ASSBIN_CHUNK_AITEXTURE) {
			CompareOnTheFlyTexture(comp);
		}
		else if ((*it).first == ASSBIN_CHUNK_AIMESH) {
			CompareOnTheFlyMesh(comp);
		}
		else if ((*it).first == ASSBIN_CHUNK_AIANIMATION) {
			CompareOnTheFlyAnimation(comp);
		}
		else if ((*it).first == ASSBIN_CHUNK_AICAMERA) {
			CompareOnTheFlyCamera(comp);
		}
		else if ((*it).first == ASSBIN_CHUNK_AILIGHT) {
			CompareOnTheFlyLight(comp);
		}
		else if ((*it).first == ASSBIN_CHUNK_AINODE) {
			CompareOnTheFlyNode(comp);
		}
	}
}

////////////////////////////////////////////////////////////////////////////////////////////////////
void CompareOnTheFly(comparer_context& comp)
{
	sliced_chunk_reader reader(comp);
	for(sliced_chunk_iterator it = reader.begin(); !it.is_end(); ++it) {
		if ((*it).first == ASSBIN_CHUNK_AISCENE) {
			CompareOnTheFlyScene(comp);
			break;
		}
	}
}

////////////////////////////////////////////////////////////////////////////////////////////////////
void CheckHeader(comparer_context& comp)
{
	fseek(comp.get_actual(),ASSBIN_HEADER_LENGTH,SEEK_CUR);
	fseek(comp.get_expect(),ASSBIN_HEADER_LENGTH,SEEK_CUR);
}

////////////////////////////////////////////////////////////////////////////////////////////////////
int Assimp_CompareDump (const char* const* params, unsigned int num)
{
	// --help
	if ((num == 1 && !strcmp( params[0], "-h")) || !strcmp( params[0], "--help") || !strcmp( params[0], "-?") ) {
		printf("%s",AICMD_MSG_CMPDUMP_HELP);
		return 0;
	}

	// assimp cmpdump actual expected
	if (num < 1) {
		std::cout << "assimp cmpdump: Invalid number of arguments. "
			"See \'assimp cmpdump --help\'\r\n" << std::endl;
		return 1;
	}

	if(!strcmp(params[0],params[1])) {
		std::cout << "assimp cmpdump: same file, same content." << std::endl;
		return 0;
	}

	FILE* actual = fopen(params[0],"rb"), *expected = fopen(params[1],"rb");
	if (!actual) {
		std::cout << "assimp cmpdump: Failure reading ACTUAL data from " << 
			params[0]  << std::endl;
		return -5;
	}
	if (!expected) {
		std::cout << "assimp cmpdump: Failure reading EXPECT data from " << 
			params[1]  << std::endl;
		return -6;
	}

	comparer_context comp(actual,expected);
	try {
		CheckHeader(comp);
		CompareOnTheFly(comp);
	}
	catch(const compare_fails_exception& ex) {
		printf("%s",ex.what());
		return -1;
	}
	catch(...) {
		// we don't bother checking too rigourously here, so
		// we might end up here ...
		std::cout << "Unknown failure, are the input files well-defined?";
		return -3;
	}

	std::cout << "Success (totally " << std::dec << comp.get_num_chunks() << 
		" chunks)" << std::endl;

	return 0;
}