443 lines
15 KiB
C++
443 lines
15 KiB
C++
/*************************************************************************/
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/* FBXBinaryTokenizer.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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/*
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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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#include "ByteSwapper.h"
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#include "FBXTokenizer.h"
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#include "core/string/print_string.h"
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#include <stdint.h>
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namespace FBXDocParser {
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// ------------------------------------------------------------------------------------------------
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Token::Token(const char *sbegin, const char *send, TokenType type, size_t offset) :
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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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#ifdef DEBUG_ENABLED
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// contents is bad.. :/
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contents = std::string(sbegin, static_cast<size_t>(send - sbegin));
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#endif
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// calc length
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// measure from sBegin to sEnd and validate?
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}
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namespace {
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// ------------------------------------------------------------------------------------------------
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// signal tokenization error
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void TokenizeError(const std::string &message, size_t offset) {
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print_error("[FBX-Tokenize] " + String(message.c_str()) + ", offset " + itos(offset));
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}
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// ------------------------------------------------------------------------------------------------
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size_t Offset(const char *begin, const char *cursor) {
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//ai_assert(begin <= cursor);
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return 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, bool &corrupt) {
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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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corrupt = true;
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return;
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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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// 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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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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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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break;
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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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} // 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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corrupt = true; // must exit
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TokenizeError("cannot ReadData, unexpected type code: " + std::string(&type, 1), input, cursor);
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return;
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}
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if (cursor > end) {
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corrupt = true; // must exit
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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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return;
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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, bool &corrupt) {
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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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corrupt = true;
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return false;
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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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corrupt = true;
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return false;
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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 = nullptr, *send = nullptr;
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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, corrupt);
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if (corrupt) {
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return false;
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}
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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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corrupt = true;
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return false;
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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, corrupt);
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if (corrupt) {
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return false;
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}
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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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corrupt = true;
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return false;
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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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corrupt = true;
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return false;
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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, size_t length, bool &corrupt) {
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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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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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print_verbose("FBX Version: " + itos(version));
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//ASSIMP_LOG_DEBUG_F("FBX version: ", version);
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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, corrupt)) {
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break;
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}
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}
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}
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} // namespace FBXDocParser
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