377 lines
12 KiB
C++
377 lines
12 KiB
C++
/*
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Open Asset Import Library (assimp)
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----------------------------------------------------------------------
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Copyright (c) 2006-2017, assimp 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
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following 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 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 BlenderDNA.cpp
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* @brief Implementation of the Blender `DNA`, that is its own
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* serialized set of data structures.
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*/
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#ifndef ASSIMP_BUILD_NO_BLEND_IMPORTER
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#include "BlenderDNA.h"
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#include <assimp/StreamReader.h>
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#include <assimp/fast_atof.h>
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#include <assimp/TinyFormatter.h>
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using namespace Assimp;
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using namespace Assimp::Blender;
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using namespace Assimp::Formatter;
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static bool match4(StreamReaderAny& stream, const char* string) {
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ai_assert( nullptr != string );
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char tmp[] = {
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(const char)(stream).GetI1(),
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(const char)(stream).GetI1(),
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(const char)(stream).GetI1(),
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(const char)(stream).GetI1()
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};
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return (tmp[0]==string[0] && tmp[1]==string[1] && tmp[2]==string[2] && tmp[3]==string[3]);
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}
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struct Type {
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size_t size;
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std::string name;
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};
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// ------------------------------------------------------------------------------------------------
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void DNAParser::Parse ()
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{
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StreamReaderAny& stream = *db.reader.get();
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DNA& dna = db.dna;
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if(!match4(stream,"SDNA")) {
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throw DeadlyImportError("BlenderDNA: Expected SDNA chunk");
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}
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// name dictionary
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if(!match4(stream,"NAME")) {
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throw DeadlyImportError("BlenderDNA: Expected NAME field");
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}
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std::vector<std::string> names (stream.GetI4());
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for(std::string& s : names) {
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while (char c = stream.GetI1()) {
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s += c;
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}
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}
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// type dictionary
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for (;stream.GetCurrentPos() & 0x3; stream.GetI1());
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if(!match4(stream,"TYPE")) {
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throw DeadlyImportError("BlenderDNA: Expected TYPE field");
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}
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std::vector<Type> types (stream.GetI4());
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for(Type& s : types) {
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while (char c = stream.GetI1()) {
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s.name += c;
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}
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}
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// type length dictionary
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for (;stream.GetCurrentPos() & 0x3; stream.GetI1());
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if(!match4(stream,"TLEN")) {
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throw DeadlyImportError("BlenderDNA: Expected TLEN field");
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}
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for(Type& s : types) {
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s.size = stream.GetI2();
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}
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// structures dictionary
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for (;stream.GetCurrentPos() & 0x3; stream.GetI1());
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if(!match4(stream,"STRC")) {
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throw DeadlyImportError("BlenderDNA: Expected STRC field");
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}
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size_t end = stream.GetI4(), fields = 0;
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dna.structures.reserve(end);
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for(size_t i = 0; i != end; ++i) {
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uint16_t n = stream.GetI2();
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if (n >= types.size()) {
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throw DeadlyImportError((format(),
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"BlenderDNA: Invalid type index in structure name" ,n,
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" (there are only ", types.size(), " entries)"
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));
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}
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// maintain separate indexes
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dna.indices[types[n].name] = dna.structures.size();
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dna.structures.push_back(Structure());
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Structure& s = dna.structures.back();
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s.name = types[n].name;
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//s.index = dna.structures.size()-1;
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n = stream.GetI2();
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s.fields.reserve(n);
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size_t offset = 0;
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for (size_t m = 0; m < n; ++m, ++fields) {
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uint16_t j = stream.GetI2();
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if (j >= types.size()) {
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throw DeadlyImportError((format(),
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"BlenderDNA: Invalid type index in structure field ", j,
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" (there are only ", types.size(), " entries)"
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));
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}
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s.fields.push_back(Field());
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Field& f = s.fields.back();
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f.offset = offset;
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f.type = types[j].name;
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f.size = types[j].size;
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j = stream.GetI2();
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if (j >= names.size()) {
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throw DeadlyImportError((format(),
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"BlenderDNA: Invalid name index in structure field ", j,
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" (there are only ", names.size(), " entries)"
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));
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}
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f.name = names[j];
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f.flags = 0u;
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// pointers always specify the size of the pointee instead of their own.
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// The pointer asterisk remains a property of the lookup name.
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if (f.name[0] == '*') {
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f.size = db.i64bit ? 8 : 4;
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f.flags |= FieldFlag_Pointer;
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}
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// arrays, however, specify the size of a single element so we
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// need to parse the (possibly multi-dimensional) array declaration
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// in order to obtain the actual size of the array in the file.
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// Also we need to alter the lookup name to include no array
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// brackets anymore or size fixup won't work (if our size does
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// not match the size read from the DNA).
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if (*f.name.rbegin() == ']') {
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const std::string::size_type rb = f.name.find('[');
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if (rb == std::string::npos) {
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throw DeadlyImportError((format(),
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"BlenderDNA: Encountered invalid array declaration ",
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f.name
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));
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}
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f.flags |= FieldFlag_Array;
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DNA::ExtractArraySize(f.name,f.array_sizes);
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f.name = f.name.substr(0,rb);
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f.size *= f.array_sizes[0] * f.array_sizes[1];
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}
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// maintain separate indexes
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s.indices[f.name] = s.fields.size()-1;
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offset += f.size;
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}
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s.size = offset;
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}
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DefaultLogger::get()->debug((format(),"BlenderDNA: Got ",dna.structures.size(),
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" structures with totally ",fields," fields"));
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#ifdef ASSIMP_BUILD_BLENDER_DEBUG
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dna.DumpToFile();
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#endif
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dna.AddPrimitiveStructures();
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dna.RegisterConverters();
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}
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#ifdef ASSIMP_BUILD_BLENDER_DEBUG
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#include <fstream>
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// ------------------------------------------------------------------------------------------------
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void DNA :: DumpToFile()
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{
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// we dont't bother using the VFS here for this is only for debugging.
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// (and all your bases are belong to us).
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std::ofstream f("dna.txt");
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if (f.fail()) {
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DefaultLogger::get()->error("Could not dump dna to dna.txt");
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return;
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}
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f << "Field format: type name offset size" << "\n";
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f << "Structure format: name size" << "\n";
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for(const Structure& s : structures) {
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f << s.name << " " << s.size << "\n\n";
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for(const Field& ff : s.fields) {
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f << "\t" << ff.type << " " << ff.name << " " << ff.offset << " " << ff.size << "\n";
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}
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f << "\n";
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}
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f << std::flush;
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DefaultLogger::get()->info("BlenderDNA: Dumped dna to dna.txt");
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}
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#endif
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// ------------------------------------------------------------------------------------------------
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/*static*/ void DNA :: ExtractArraySize(
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const std::string& out,
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size_t array_sizes[2]
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)
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{
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array_sizes[0] = array_sizes[1] = 1;
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std::string::size_type pos = out.find('[');
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if (pos++ == std::string::npos) {
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return;
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}
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array_sizes[0] = strtoul10(&out[pos]);
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pos = out.find('[',pos);
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if (pos++ == std::string::npos) {
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return;
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}
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array_sizes[1] = strtoul10(&out[pos]);
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}
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// ------------------------------------------------------------------------------------------------
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std::shared_ptr< ElemBase > DNA :: ConvertBlobToStructure(
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const Structure& structure,
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const FileDatabase& db
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) const
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{
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std::map<std::string, FactoryPair >::const_iterator it = converters.find(structure.name);
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if (it == converters.end()) {
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return std::shared_ptr< ElemBase >();
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}
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std::shared_ptr< ElemBase > ret = (structure.*((*it).second.first))();
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(structure.*((*it).second.second))(ret,db);
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return ret;
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}
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// ------------------------------------------------------------------------------------------------
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DNA::FactoryPair DNA :: GetBlobToStructureConverter(
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const Structure& structure,
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const FileDatabase& /*db*/
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) const
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{
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std::map<std::string, FactoryPair>::const_iterator it = converters.find(structure.name);
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return it == converters.end() ? FactoryPair() : (*it).second;
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}
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// basing on http://www.blender.org/development/architecture/notes-on-sdna/
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// ------------------------------------------------------------------------------------------------
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void DNA :: AddPrimitiveStructures()
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{
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// NOTE: these are just dummies. Their presence enforces
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// Structure::Convert<target_type> to be called on these
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// empty structures. These converters are special
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// overloads which scan the name of the structure and
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// perform the required data type conversion if one
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// of these special names is found in the structure
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// in question.
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indices["int"] = structures.size();
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structures.push_back( Structure() );
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structures.back().name = "int";
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structures.back().size = 4;
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indices["short"] = structures.size();
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structures.push_back( Structure() );
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structures.back().name = "short";
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structures.back().size = 2;
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indices["char"] = structures.size();
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structures.push_back( Structure() );
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structures.back().name = "char";
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structures.back().size = 1;
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indices["float"] = structures.size();
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structures.push_back( Structure() );
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structures.back().name = "float";
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structures.back().size = 4;
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indices["double"] = structures.size();
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structures.push_back( Structure() );
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structures.back().name = "double";
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structures.back().size = 8;
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// no long, seemingly.
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}
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// ------------------------------------------------------------------------------------------------
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void SectionParser :: Next()
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{
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stream.SetCurrentPos(current.start + current.size);
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const char tmp[] = {
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(const char)stream.GetI1(),
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(const char)stream.GetI1(),
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(const char)stream.GetI1(),
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(const char)stream.GetI1()
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};
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current.id = std::string(tmp,tmp[3]?4:tmp[2]?3:tmp[1]?2:1);
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current.size = stream.GetI4();
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current.address.val = ptr64 ? stream.GetU8() : stream.GetU4();
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current.dna_index = stream.GetI4();
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current.num = stream.GetI4();
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current.start = stream.GetCurrentPos();
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if (stream.GetRemainingSizeToLimit() < current.size) {
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throw DeadlyImportError("BLEND: invalid size of file block");
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}
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#ifdef ASSIMP_BUILD_BLENDER_DEBUG
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DefaultLogger::get()->debug(current.id);
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#endif
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}
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#endif
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