467 lines
15 KiB
C++
467 lines
15 KiB
C++
/*
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Open Asset Import Library (assimp)
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----------------------------------------------------------------------
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Copyright (c) 2006-2019, 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 FBXBinaryTokenizer.cpp
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* @brief Implementation of a fake lexer for binary fbx files -
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* we emit tokens so the parser needs almost no special handling
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* for binary files.
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*/
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#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER
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#include "FBXTokenizer.h"
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#include "FBXUtil.h"
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#include <assimp/defs.h>
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#include <stdint.h>
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#include <assimp/Exceptional.h>
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#include <assimp/ByteSwapper.h>
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namespace Assimp {
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namespace FBX {
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//enum Flag
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//{
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// e_unknown_0 = 1 << 0,
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// e_unknown_1 = 1 << 1,
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// e_unknown_2 = 1 << 2,
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// e_unknown_3 = 1 << 3,
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// e_unknown_4 = 1 << 4,
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// e_unknown_5 = 1 << 5,
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// e_unknown_6 = 1 << 6,
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// e_unknown_7 = 1 << 7,
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// e_unknown_8 = 1 << 8,
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// e_unknown_9 = 1 << 9,
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// e_unknown_10 = 1 << 10,
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// e_unknown_11 = 1 << 11,
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// e_unknown_12 = 1 << 12,
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// e_unknown_13 = 1 << 13,
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// e_unknown_14 = 1 << 14,
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// e_unknown_15 = 1 << 15,
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// e_unknown_16 = 1 << 16,
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// e_unknown_17 = 1 << 17,
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// e_unknown_18 = 1 << 18,
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// e_unknown_19 = 1 << 19,
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// e_unknown_20 = 1 << 20,
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// e_unknown_21 = 1 << 21,
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// e_unknown_22 = 1 << 22,
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// e_unknown_23 = 1 << 23,
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// e_flag_field_size_64_bit = 1 << 24, // Not sure what is
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// e_unknown_25 = 1 << 25,
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// e_unknown_26 = 1 << 26,
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// e_unknown_27 = 1 << 27,
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// e_unknown_28 = 1 << 28,
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// e_unknown_29 = 1 << 29,
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// e_unknown_30 = 1 << 30,
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// e_unknown_31 = 1 << 31
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//};
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//
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//bool check_flag(uint32_t flags, Flag to_check)
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//{
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// return (flags & to_check) != 0;
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//}
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// ------------------------------------------------------------------------------------------------
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Token::Token(const char* sbegin, const char* send, TokenType type, unsigned int offset)
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:
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#ifdef DEBUG
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contents(sbegin, static_cast<size_t>(send-sbegin)),
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#endif
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sbegin(sbegin)
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, send(send)
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, type(type)
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, line(offset)
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, column(BINARY_MARKER)
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{
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ai_assert(sbegin);
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ai_assert(send);
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// binary tokens may have zero length because they are sometimes dummies
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// inserted by TokenizeBinary()
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ai_assert(send >= sbegin);
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}
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namespace {
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// ------------------------------------------------------------------------------------------------
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// signal tokenization error, this is always unrecoverable. Throws DeadlyImportError.
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AI_WONT_RETURN void TokenizeError(const std::string& message, unsigned int offset) AI_WONT_RETURN_SUFFIX;
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AI_WONT_RETURN void TokenizeError(const std::string& message, unsigned int offset)
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{
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throw DeadlyImportError(Util::AddOffset("FBX-Tokenize",message,offset));
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}
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// ------------------------------------------------------------------------------------------------
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uint32_t Offset(const char* begin, const char* cursor) {
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ai_assert(begin <= cursor);
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return static_cast<unsigned int>(cursor - begin);
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}
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// ------------------------------------------------------------------------------------------------
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void TokenizeError(const std::string& message, const char* begin, const char* cursor) {
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TokenizeError(message, Offset(begin, cursor));
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}
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// ------------------------------------------------------------------------------------------------
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uint32_t ReadWord(const char* input, const char*& cursor, const char* end) {
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const size_t k_to_read = sizeof( uint32_t );
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if(Offset(cursor, end) < k_to_read ) {
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TokenizeError("cannot ReadWord, out of bounds",input, cursor);
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}
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uint32_t word;
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::memcpy(&word, cursor, 4);
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AI_SWAP4(word);
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cursor += k_to_read;
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return word;
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}
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// ------------------------------------------------------------------------------------------------
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uint64_t ReadDoubleWord(const char* input, const char*& cursor, const char* end) {
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const size_t k_to_read = sizeof(uint64_t);
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if(Offset(cursor, end) < k_to_read) {
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TokenizeError("cannot ReadDoubleWord, out of bounds",input, cursor);
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}
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uint64_t dword /*= *reinterpret_cast<const uint64_t*>(cursor)*/;
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::memcpy( &dword, cursor, sizeof( uint64_t ) );
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AI_SWAP8(dword);
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cursor += k_to_read;
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return dword;
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}
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// ------------------------------------------------------------------------------------------------
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uint8_t ReadByte(const char* input, const char*& cursor, const char* end) {
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if(Offset(cursor, end) < sizeof( uint8_t ) ) {
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TokenizeError("cannot ReadByte, out of bounds",input, cursor);
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}
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uint8_t word;/* = *reinterpret_cast< const uint8_t* >( cursor )*/
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::memcpy( &word, cursor, sizeof( uint8_t ) );
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++cursor;
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return word;
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}
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// ------------------------------------------------------------------------------------------------
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unsigned int ReadString(const char*& sbegin_out, const char*& send_out, const char* input,
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const char*& cursor, const char* end, bool long_length = false, bool allow_null = false) {
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const uint32_t len_len = long_length ? 4 : 1;
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if(Offset(cursor, end) < len_len) {
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TokenizeError("cannot ReadString, out of bounds reading length",input, cursor);
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}
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const uint32_t length = long_length ? ReadWord(input, cursor, end) : ReadByte(input, cursor, end);
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if (Offset(cursor, end) < length) {
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TokenizeError("cannot ReadString, length is out of bounds",input, cursor);
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}
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sbegin_out = cursor;
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cursor += length;
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send_out = cursor;
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if(!allow_null) {
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for (unsigned int i = 0; i < length; ++i) {
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if(sbegin_out[i] == '\0') {
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TokenizeError("failed ReadString, unexpected NUL character in string",input, cursor);
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}
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}
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}
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return length;
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}
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// ------------------------------------------------------------------------------------------------
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void ReadData(const char*& sbegin_out, const char*& send_out, const char* input, const char*& cursor, const char* end) {
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if(Offset(cursor, end) < 1) {
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TokenizeError("cannot ReadData, out of bounds reading length",input, cursor);
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}
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const char type = *cursor;
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sbegin_out = cursor++;
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switch(type)
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{
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// 16 bit int
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case 'Y':
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cursor += 2;
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break;
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// 1 bit bool flag (yes/no)
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case 'C':
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cursor += 1;
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break;
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// 32 bit int
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case 'I':
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// <- fall through
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// float
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case 'F':
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cursor += 4;
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break;
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// double
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case 'D':
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cursor += 8;
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break;
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// 64 bit int
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case 'L':
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cursor += 8;
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break;
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// note: do not write cursor += ReadWord(...cursor) as this would be UB
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// raw binary data
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case 'R':
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{
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const uint32_t length = ReadWord(input, cursor, end);
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cursor += length;
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break;
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}
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case 'b':
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// TODO: what is the 'b' type code? Right now we just skip over it /
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// take the full range we could get
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cursor = end;
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break;
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// array of *
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case 'f':
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case 'd':
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case 'l':
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case 'i':
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case 'c': {
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const uint32_t length = ReadWord(input, cursor, end);
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const uint32_t encoding = ReadWord(input, cursor, end);
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const uint32_t comp_len = ReadWord(input, cursor, end);
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// compute length based on type and check against the stored value
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if(encoding == 0) {
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uint32_t stride = 0;
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switch(type)
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{
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case 'f':
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case 'i':
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stride = 4;
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break;
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case 'd':
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case 'l':
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stride = 8;
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break;
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case 'c':
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stride = 1;
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break;
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default:
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ai_assert(false);
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};
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ai_assert(stride > 0);
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if(length * stride != comp_len) {
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TokenizeError("cannot ReadData, calculated data stride differs from what the file claims",input, cursor);
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}
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}
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// zip/deflate algorithm (encoding==1)? take given length. anything else? die
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else if (encoding != 1) {
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TokenizeError("cannot ReadData, unknown encoding",input, cursor);
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}
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cursor += comp_len;
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break;
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}
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// string
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case 'S': {
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const char* sb, *se;
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// 0 characters can legally happen in such strings
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ReadString(sb, se, input, cursor, end, true, true);
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break;
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}
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default:
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TokenizeError("cannot ReadData, unexpected type code: " + std::string(&type, 1),input, cursor);
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}
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if(cursor > end) {
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TokenizeError("cannot ReadData, the remaining size is too small for the data type: " + std::string(&type, 1),input, cursor);
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}
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// the type code is contained in the returned range
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send_out = cursor;
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}
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// ------------------------------------------------------------------------------------------------
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bool ReadScope(TokenList& output_tokens, const char* input, const char*& cursor, const char* end, bool const is64bits)
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{
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// the first word contains the offset at which this block ends
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const uint64_t end_offset = is64bits ? ReadDoubleWord(input, cursor, end) : ReadWord(input, cursor, end);
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// we may get 0 if reading reached the end of the file -
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// fbx files have a mysterious extra footer which I don't know
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// how to extract any information from, but at least it always
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// starts with a 0.
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if(!end_offset) {
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return false;
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}
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if(end_offset > Offset(input, end)) {
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TokenizeError("block offset is out of range",input, cursor);
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}
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else if(end_offset < Offset(input, cursor)) {
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TokenizeError("block offset is negative out of range",input, cursor);
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}
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// the second data word contains the number of properties in the scope
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const uint64_t prop_count = is64bits ? ReadDoubleWord(input, cursor, end) : ReadWord(input, cursor, end);
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// the third data word contains the length of the property list
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const uint64_t prop_length = is64bits ? ReadDoubleWord(input, cursor, end) : ReadWord(input, cursor, end);
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// now comes the name of the scope/key
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const char* sbeg, *send;
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ReadString(sbeg, send, input, cursor, end);
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output_tokens.push_back(new_Token(sbeg, send, TokenType_KEY, Offset(input, cursor) ));
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// now come the individual properties
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const char* begin_cursor = cursor;
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for (unsigned int i = 0; i < prop_count; ++i) {
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ReadData(sbeg, send, input, cursor, begin_cursor + prop_length);
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output_tokens.push_back(new_Token(sbeg, send, TokenType_DATA, Offset(input, cursor) ));
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if(i != prop_count-1) {
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output_tokens.push_back(new_Token(cursor, cursor + 1, TokenType_COMMA, Offset(input, cursor) ));
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}
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}
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if (Offset(begin_cursor, cursor) != prop_length) {
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TokenizeError("property length not reached, something is wrong",input, cursor);
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}
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// at the end of each nested block, there is a NUL record to indicate
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// that the sub-scope exists (i.e. to distinguish between P: and P : {})
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// this NUL record is 13 bytes long on 32 bit version and 25 bytes long on 64 bit.
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const size_t sentinel_block_length = is64bits ? (sizeof(uint64_t)* 3 + 1) : (sizeof(uint32_t)* 3 + 1);
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if (Offset(input, cursor) < end_offset) {
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if (end_offset - Offset(input, cursor) < sentinel_block_length) {
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TokenizeError("insufficient padding bytes at block end",input, cursor);
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}
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output_tokens.push_back(new_Token(cursor, cursor + 1, TokenType_OPEN_BRACKET, Offset(input, cursor) ));
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// XXX this is vulnerable to stack overflowing ..
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while(Offset(input, cursor) < end_offset - sentinel_block_length) {
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ReadScope(output_tokens, input, cursor, input + end_offset - sentinel_block_length, is64bits);
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}
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output_tokens.push_back(new_Token(cursor, cursor + 1, TokenType_CLOSE_BRACKET, Offset(input, cursor) ));
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for (unsigned int i = 0; i < sentinel_block_length; ++i) {
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if(cursor[i] != '\0') {
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TokenizeError("failed to read nested block sentinel, expected all bytes to be 0",input, cursor);
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}
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}
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cursor += sentinel_block_length;
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}
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if (Offset(input, cursor) != end_offset) {
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TokenizeError("scope length not reached, something is wrong",input, cursor);
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}
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return true;
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}
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} // anonymous namespace
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// ------------------------------------------------------------------------------------------------
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// TODO: Test FBX Binary files newer than the 7500 version to check if the 64 bits address behaviour is consistent
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void TokenizeBinary(TokenList& output_tokens, const char* input, unsigned int length)
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{
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ai_assert(input);
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if(length < 0x1b) {
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TokenizeError("file is too short",0);
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}
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//uint32_t offset = 0x15;
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/* const char* cursor = input + 0x15;
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const uint32_t flags = ReadWord(input, cursor, input + length);
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const uint8_t padding_0 = ReadByte(input, cursor, input + length); // unused
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const uint8_t padding_1 = ReadByte(input, cursor, input + length); // unused*/
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if (strncmp(input,"Kaydara FBX Binary",18)) {
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TokenizeError("magic bytes not found",0);
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}
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const char* cursor = input + 18;
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/*Result ignored*/ ReadByte(input, cursor, input + length);
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/*Result ignored*/ ReadByte(input, cursor, input + length);
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/*Result ignored*/ ReadByte(input, cursor, input + length);
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/*Result ignored*/ ReadByte(input, cursor, input + length);
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/*Result ignored*/ ReadByte(input, cursor, input + length);
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const uint32_t version = ReadWord(input, cursor, input + length);
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const bool is64bits = version >= 7500;
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const char *end = input + length;
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while (cursor < end ) {
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if (!ReadScope(output_tokens, input, cursor, input + length, is64bits)) {
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break;
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}
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}
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}
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} // !FBX
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} // !Assimp
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#endif
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