binaries/assimp-3.1.1/code/BlenderDNA.cpp

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

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All rights reserved.

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  following disclaimer.

* Redistributions in binary form must reproduce the above
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*/

/** @file  BlenderDNA.cpp
 *  @brief Implementation of the Blender `DNA`, that is its own
 *    serialized set of data structures.
 */
#include "AssimpPCH.h"

#ifndef ASSIMP_BUILD_NO_BLEND_IMPORTER
#include "BlenderDNA.h"
#include "StreamReader.h"
#include "fast_atof.h"

using namespace Assimp;
using namespace Assimp::Blender;
using namespace Assimp::Formatter;

#define for_each BOOST_FOREACH
bool match4(StreamReaderAny& stream, const char* string) {
	char tmp[] = { 
		(stream).GetI1(), 
		(stream).GetI1(),  
		(stream).GetI1(), 
		(stream).GetI1()
	};
	return (tmp[0]==string[0] && tmp[1]==string[1] && tmp[2]==string[2] && tmp[3]==string[3]);
}

struct Type {
	size_t size;
	std::string name;
};

// ------------------------------------------------------------------------------------------------
void DNAParser :: Parse () 
{
	StreamReaderAny& stream = *db.reader.get();
	DNA& dna = db.dna;

	if(!match4(stream,"SDNA")) {
		throw DeadlyImportError("BlenderDNA: Expected SDNA chunk");
	}

	// name dictionary
	if(!match4(stream,"NAME")) {
		throw DeadlyImportError("BlenderDNA: Expected NAME field");
	}
	
	std::vector<std::string> names (stream.GetI4());
	for_each(std::string& s, names) {
		while (char c = stream.GetI1()) {
			s += c;
		}
	}

	// type dictionary
	for (;stream.GetCurrentPos() & 0x3; stream.GetI1());
	if(!match4(stream,"TYPE")) {
		throw DeadlyImportError("BlenderDNA: Expected TYPE field");
	}
	
	std::vector<Type> types (stream.GetI4());
	for_each(Type& s, types) {
		while (char c = stream.GetI1()) {
			s.name += c;
		}
	}

	// type length dictionary
	for (;stream.GetCurrentPos() & 0x3; stream.GetI1());
	if(!match4(stream,"TLEN")) {
		throw DeadlyImportError("BlenderDNA: Expected TLEN field");
	}
	
	for_each(Type& s, types) {
		s.size = stream.GetI2();
	}

	// structures dictionary
	for (;stream.GetCurrentPos() & 0x3; stream.GetI1());
	if(!match4(stream,"STRC")) {
		throw DeadlyImportError("BlenderDNA: Expected STRC field");
	}

	size_t end = stream.GetI4(), fields = 0;

	dna.structures.reserve(end);
	for(size_t i = 0; i != end; ++i) {
		
		uint16_t n = stream.GetI2();
		if (n >= types.size()) {
			throw DeadlyImportError((format(),
				"BlenderDNA: Invalid type index in structure name" ,n, 
				" (there are only ", types.size(), " entries)"
			));
		}

		// maintain separate indexes
		dna.indices[types[n].name] = dna.structures.size();

		dna.structures.push_back(Structure());
		Structure& s = dna.structures.back();
		s.name  = types[n].name;
		//s.index = dna.structures.size()-1;

		n = stream.GetI2();
		s.fields.reserve(n);

		size_t offset = 0;
		for (size_t m = 0; m < n; ++m, ++fields) {

			uint16_t j = stream.GetI2();
			if (j >= types.size()) {
				throw DeadlyImportError((format(), 
					"BlenderDNA: Invalid type index in structure field ", j, 
					" (there are only ", types.size(), " entries)"
				));
			}
			s.fields.push_back(Field());
			Field& f = s.fields.back();
			f.offset = offset;

			f.type = types[j].name;
			f.size = types[j].size;

			j = stream.GetI2();
			if (j >= names.size()) {
				throw DeadlyImportError((format(), 
					"BlenderDNA: Invalid name index in structure field ", j, 
					" (there are only ", names.size(), " entries)"
				));
			}

			f.name = names[j];
			f.flags = 0u;
			
			// pointers always specify the size of the pointee instead of their own.
			// The pointer asterisk remains a property of the lookup name.
			if (f.name[0] == '*') {
				f.size = db.i64bit ? 8 : 4;
				f.flags |= FieldFlag_Pointer;
			}

			// arrays, however, specify the size of a single element so we
			// need to parse the (possibly multi-dimensional) array declaration
			// in order to obtain the actual size of the array in the file.
			// Also we need to alter the lookup name to include no array
			// brackets anymore or size fixup won't work (if our size does 
			// not match the size read from the DNA).
			if (*f.name.rbegin() == ']') {
				const std::string::size_type rb = f.name.find('[');
				if (rb == std::string::npos) {
					throw DeadlyImportError((format(), 
						"BlenderDNA: Encountered invalid array declaration ",
						f.name
					));
				}

				f.flags |= FieldFlag_Array; 
				DNA::ExtractArraySize(f.name,f.array_sizes);
				f.name = f.name.substr(0,rb);

				f.size *= f.array_sizes[0] * f.array_sizes[1];
			}

			// maintain separate indexes
			s.indices[f.name] = s.fields.size()-1;
			offset += f.size;
		}
		s.size = offset;
	}

	DefaultLogger::get()->debug((format(),"BlenderDNA: Got ",dna.structures.size(),
		" structures with totally ",fields," fields"));

#ifdef ASSIMP_BUILD_BLENDER_DEBUG
	dna.DumpToFile();
#endif

	dna.AddPrimitiveStructures();
	dna.RegisterConverters();
}


#ifdef ASSIMP_BUILD_BLENDER_DEBUG

#include <fstream>
// ------------------------------------------------------------------------------------------------
void DNA :: DumpToFile()
{
	// we dont't bother using the VFS here for this is only for debugging.
	// (and all your bases are belong to us).

	std::ofstream f("dna.txt");
	if (f.fail()) {
		DefaultLogger::get()->error("Could not dump dna to dna.txt");
		return;
	}
	f << "Field format: type name offset size" << "\n";
	f << "Structure format: name size" << "\n";

	for_each(const Structure& s, structures) {
		f << s.name << " " << s.size << "\n\n";
		for_each(const Field& ff, s.fields) {
			f << "\t" << ff.type << " " << ff.name << " " << ff.offset << " " << ff.size << std::endl;
		}
		f << std::endl;
	}
	DefaultLogger::get()->info("BlenderDNA: Dumped dna to dna.txt");
}
#endif

// ------------------------------------------------------------------------------------------------
/*static*/ void  DNA :: ExtractArraySize(
	const std::string& out, 
	size_t array_sizes[2]
)
{
	array_sizes[0] = array_sizes[1] = 1;
	std::string::size_type pos = out.find('[');
	if (pos++ == std::string::npos) {
		return;
	}
	array_sizes[0] = strtoul10(&out[pos]);

	pos = out.find('[',pos);
	if (pos++ == std::string::npos) {
		return;
	}
	array_sizes[1] = strtoul10(&out[pos]);
}

// ------------------------------------------------------------------------------------------------
boost::shared_ptr< ElemBase > DNA :: ConvertBlobToStructure(
	const Structure& structure,
	const FileDatabase& db
) const 
{
	std::map<std::string, FactoryPair >::const_iterator it = converters.find(structure.name);
	if (it == converters.end()) {
		return boost::shared_ptr< ElemBase >();
	}

	boost::shared_ptr< ElemBase > ret = (structure.*((*it).second.first))();
	(structure.*((*it).second.second))(ret,db);
	
	return ret;
}

// ------------------------------------------------------------------------------------------------
DNA::FactoryPair DNA :: GetBlobToStructureConverter(
	const Structure& structure,
	const FileDatabase& /*db*/
) const 
{
	std::map<std::string,  FactoryPair>::const_iterator it = converters.find(structure.name);
	return it == converters.end() ? FactoryPair() : (*it).second;
}

// basing on http://www.blender.org/development/architecture/notes-on-sdna/
// ------------------------------------------------------------------------------------------------
void DNA :: AddPrimitiveStructures()
{
	// NOTE: these are just dummies. Their presence enforces
	// Structure::Convert<target_type> to be called on these
	// empty structures. These converters are special 
	// overloads which scan the name of the structure and
	// perform the required data type conversion if one
	// of these special names is found in the structure
	// in question.

	indices["int"] = structures.size();
	structures.push_back( Structure() );
	structures.back().name = "int";
	structures.back().size = 4;

	indices["short"] = structures.size();
	structures.push_back( Structure() );
	structures.back().name = "short";
	structures.back().size = 2;


	indices["char"] = structures.size();
	structures.push_back( Structure() );
	structures.back().name = "char";
	structures.back().size = 1;


	indices["float"] = structures.size();
	structures.push_back( Structure() );
	structures.back().name = "float";
	structures.back().size = 4;


	indices["double"] = structures.size();
	structures.push_back( Structure() );
	structures.back().name = "double";
	structures.back().size = 8;

	// no long, seemingly.
}

// ------------------------------------------------------------------------------------------------
void SectionParser :: Next()
{
	stream.SetCurrentPos(current.start + current.size);

	const char tmp[] = {
		stream.GetI1(),
		stream.GetI1(),
		stream.GetI1(),
		stream.GetI1()
	};
	current.id = std::string(tmp,tmp[3]?4:tmp[2]?3:tmp[1]?2:1);

	current.size = stream.GetI4();
	current.address.val = ptr64 ? stream.GetU8() : stream.GetU4();

	current.dna_index = stream.GetI4();
	current.num = stream.GetI4();

	current.start = stream.GetCurrentPos();
	if (stream.GetRemainingSizeToLimit() < current.size) {
		throw DeadlyImportError("BLEND: invalid size of file block");
	}

#ifdef ASSIMP_BUILD_BLENDER_DEBUG
	DefaultLogger::get()->debug(current.id);
#endif
}



#endif