468 lines
16 KiB
C++
468 lines
16 KiB
C++
/*************************************************************************/
|
|
/* FBXBinaryTokenizer.cpp */
|
|
/*************************************************************************/
|
|
/* This file is part of: */
|
|
/* GODOT ENGINE */
|
|
/* https://godotengine.org */
|
|
/*************************************************************************/
|
|
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
|
|
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
|
|
/* */
|
|
/* Permission is hereby granted, free of charge, to any person obtaining */
|
|
/* a copy of this software and associated documentation files (the */
|
|
/* "Software"), to deal in the Software without restriction, including */
|
|
/* without limitation the rights to use, copy, modify, merge, publish, */
|
|
/* distribute, sublicense, and/or sell copies of the Software, and to */
|
|
/* permit persons to whom the Software is furnished to do so, subject to */
|
|
/* the following conditions: */
|
|
/* */
|
|
/* The above copyright notice and this permission notice shall be */
|
|
/* included in all copies or substantial portions of the Software. */
|
|
/* */
|
|
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
|
|
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
|
|
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
|
|
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
|
|
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
|
|
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
|
|
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
|
/*************************************************************************/
|
|
|
|
/*
|
|
Open Asset Import Library (assimp)
|
|
----------------------------------------------------------------------
|
|
|
|
Copyright (c) 2006-2019, assimp team
|
|
|
|
|
|
All rights reserved.
|
|
|
|
Redistribution and use of this software in source and binary forms,
|
|
with or without modification, are permitted provided that the
|
|
following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above
|
|
copyright notice, this list of conditions and the
|
|
following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above
|
|
copyright notice, this list of conditions and the
|
|
following disclaimer in the documentation and/or other
|
|
materials provided with the distribution.
|
|
|
|
* Neither the name of the assimp team, nor the names of its
|
|
contributors may be used to endorse or promote products
|
|
derived from this software without specific prior
|
|
written permission of the assimp team.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
----------------------------------------------------------------------
|
|
*/
|
|
/** @file FBXBinaryTokenizer.cpp
|
|
* @brief Implementation of a fake lexer for binary fbx files -
|
|
* we emit tokens so the parser needs almost no special handling
|
|
* for binary files.
|
|
*/
|
|
|
|
#include "ByteSwapper.h"
|
|
#include "FBXTokenizer.h"
|
|
#include "core/string/print_string.h"
|
|
|
|
#include <stdint.h>
|
|
|
|
namespace FBXDocParser {
|
|
//enum Flag
|
|
//{
|
|
// e_unknown_0 = 1 << 0,
|
|
// e_unknown_1 = 1 << 1,
|
|
// e_unknown_2 = 1 << 2,
|
|
// e_unknown_3 = 1 << 3,
|
|
// e_unknown_4 = 1 << 4,
|
|
// e_unknown_5 = 1 << 5,
|
|
// e_unknown_6 = 1 << 6,
|
|
// e_unknown_7 = 1 << 7,
|
|
// e_unknown_8 = 1 << 8,
|
|
// e_unknown_9 = 1 << 9,
|
|
// e_unknown_10 = 1 << 10,
|
|
// e_unknown_11 = 1 << 11,
|
|
// e_unknown_12 = 1 << 12,
|
|
// e_unknown_13 = 1 << 13,
|
|
// e_unknown_14 = 1 << 14,
|
|
// e_unknown_15 = 1 << 15,
|
|
// e_unknown_16 = 1 << 16,
|
|
// e_unknown_17 = 1 << 17,
|
|
// e_unknown_18 = 1 << 18,
|
|
// e_unknown_19 = 1 << 19,
|
|
// e_unknown_20 = 1 << 20,
|
|
// e_unknown_21 = 1 << 21,
|
|
// e_unknown_22 = 1 << 22,
|
|
// e_unknown_23 = 1 << 23,
|
|
// e_flag_field_size_64_bit = 1 << 24, // Not sure what is
|
|
// e_unknown_25 = 1 << 25,
|
|
// e_unknown_26 = 1 << 26,
|
|
// e_unknown_27 = 1 << 27,
|
|
// e_unknown_28 = 1 << 28,
|
|
// e_unknown_29 = 1 << 29,
|
|
// e_unknown_30 = 1 << 30,
|
|
// e_unknown_31 = 1 << 31
|
|
//};
|
|
//
|
|
//bool check_flag(uint32_t flags, Flag to_check)
|
|
//{
|
|
// return (flags & to_check) != 0;
|
|
//}
|
|
// ------------------------------------------------------------------------------------------------
|
|
Token::Token(const char *sbegin, const char *send, TokenType type, size_t offset) :
|
|
sbegin(sbegin),
|
|
send(send),
|
|
type(type),
|
|
line(offset),
|
|
column(BINARY_MARKER) {
|
|
#ifdef DEBUG_ENABLED
|
|
contents = std::string(sbegin, static_cast<size_t>(send - sbegin));
|
|
#endif
|
|
// calc length
|
|
// measure from sBegin to sEnd and validate?
|
|
}
|
|
|
|
namespace {
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
// signal tokenization error
|
|
void TokenizeError(const std::string &message, size_t offset) {
|
|
print_error("[FBX-Tokenize] " + String(message.c_str()) + ", offset " + itos(offset));
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
size_t Offset(const char *begin, const char *cursor) {
|
|
//ai_assert(begin <= cursor);
|
|
|
|
return cursor - begin;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
void TokenizeError(const std::string &message, const char *begin, const char *cursor) {
|
|
TokenizeError(message, Offset(begin, cursor));
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
uint32_t ReadWord(const char *input, const char *&cursor, const char *end) {
|
|
const size_t k_to_read = sizeof(uint32_t);
|
|
if (Offset(cursor, end) < k_to_read) {
|
|
TokenizeError("cannot ReadWord, out of bounds", input, cursor);
|
|
}
|
|
|
|
uint32_t word;
|
|
::memcpy(&word, cursor, 4);
|
|
AI_SWAP4(word);
|
|
|
|
cursor += k_to_read;
|
|
|
|
return word;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
uint64_t ReadDoubleWord(const char *input, const char *&cursor, const char *end) {
|
|
const size_t k_to_read = sizeof(uint64_t);
|
|
if (Offset(cursor, end) < k_to_read) {
|
|
TokenizeError("cannot ReadDoubleWord, out of bounds", input, cursor);
|
|
}
|
|
|
|
uint64_t dword /*= *reinterpret_cast<const uint64_t*>(cursor)*/;
|
|
::memcpy(&dword, cursor, sizeof(uint64_t));
|
|
AI_SWAP8(dword);
|
|
|
|
cursor += k_to_read;
|
|
|
|
return dword;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
uint8_t ReadByte(const char *input, const char *&cursor, const char *end) {
|
|
if (Offset(cursor, end) < sizeof(uint8_t)) {
|
|
TokenizeError("cannot ReadByte, out of bounds", input, cursor);
|
|
}
|
|
|
|
uint8_t word; /* = *reinterpret_cast< const uint8_t* >( cursor )*/
|
|
::memcpy(&word, cursor, sizeof(uint8_t));
|
|
++cursor;
|
|
|
|
return word;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
unsigned int ReadString(const char *&sbegin_out, const char *&send_out, const char *input,
|
|
const char *&cursor, const char *end, bool long_length = false, bool allow_null = false) {
|
|
const uint32_t len_len = long_length ? 4 : 1;
|
|
if (Offset(cursor, end) < len_len) {
|
|
TokenizeError("cannot ReadString, out of bounds reading length", input, cursor);
|
|
}
|
|
|
|
const uint32_t length = long_length ? ReadWord(input, cursor, end) : ReadByte(input, cursor, end);
|
|
|
|
if (Offset(cursor, end) < length) {
|
|
TokenizeError("cannot ReadString, length is out of bounds", input, cursor);
|
|
}
|
|
|
|
sbegin_out = cursor;
|
|
cursor += length;
|
|
|
|
send_out = cursor;
|
|
|
|
if (!allow_null) {
|
|
for (unsigned int i = 0; i < length; ++i) {
|
|
if (sbegin_out[i] == '\0') {
|
|
TokenizeError("failed ReadString, unexpected NUL character in string", input, cursor);
|
|
}
|
|
}
|
|
}
|
|
|
|
return length;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
void ReadData(const char *&sbegin_out, const char *&send_out, const char *input, const char *&cursor, const char *end) {
|
|
if (Offset(cursor, end) < 1) {
|
|
TokenizeError("cannot ReadData, out of bounds reading length", input, cursor);
|
|
}
|
|
|
|
const char type = *cursor;
|
|
sbegin_out = cursor++;
|
|
|
|
switch (type) {
|
|
// 16 bit int
|
|
case 'Y':
|
|
cursor += 2;
|
|
break;
|
|
|
|
// 1 bit bool flag (yes/no)
|
|
case 'C':
|
|
cursor += 1;
|
|
break;
|
|
|
|
// 32 bit int
|
|
case 'I':
|
|
// <- fall through
|
|
|
|
// float
|
|
case 'F':
|
|
cursor += 4;
|
|
break;
|
|
|
|
// double
|
|
case 'D':
|
|
cursor += 8;
|
|
break;
|
|
|
|
// 64 bit int
|
|
case 'L':
|
|
cursor += 8;
|
|
break;
|
|
|
|
// note: do not write cursor += ReadWord(...cursor) as this would be UB
|
|
|
|
// raw binary data
|
|
case 'R': {
|
|
const uint32_t length = ReadWord(input, cursor, end);
|
|
cursor += length;
|
|
break;
|
|
}
|
|
|
|
case 'b':
|
|
// TODO: what is the 'b' type code? Right now we just skip over it /
|
|
// take the full range we could get
|
|
cursor = end;
|
|
break;
|
|
|
|
// array of *
|
|
case 'f':
|
|
case 'd':
|
|
case 'l':
|
|
case 'i':
|
|
case 'c': {
|
|
const uint32_t length = ReadWord(input, cursor, end);
|
|
const uint32_t encoding = ReadWord(input, cursor, end);
|
|
|
|
const uint32_t comp_len = ReadWord(input, cursor, end);
|
|
|
|
// compute length based on type and check against the stored value
|
|
if (encoding == 0) {
|
|
uint32_t stride = 0;
|
|
switch (type) {
|
|
case 'f':
|
|
case 'i':
|
|
stride = 4;
|
|
break;
|
|
|
|
case 'd':
|
|
case 'l':
|
|
stride = 8;
|
|
break;
|
|
|
|
case 'c':
|
|
stride = 1;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
};
|
|
//ai_assert(stride > 0);
|
|
if (length * stride != comp_len) {
|
|
TokenizeError("cannot ReadData, calculated data stride differs from what the file claims", input, cursor);
|
|
}
|
|
}
|
|
// zip/deflate algorithm (encoding==1)? take given length. anything else? die
|
|
else if (encoding != 1) {
|
|
TokenizeError("cannot ReadData, unknown encoding", input, cursor);
|
|
}
|
|
cursor += comp_len;
|
|
break;
|
|
}
|
|
|
|
// string
|
|
case 'S': {
|
|
const char *sb, *se;
|
|
// 0 characters can legally happen in such strings
|
|
ReadString(sb, se, input, cursor, end, true, true);
|
|
break;
|
|
}
|
|
default:
|
|
TokenizeError("cannot ReadData, unexpected type code: " + std::string(&type, 1), input, cursor);
|
|
}
|
|
|
|
if (cursor > end) {
|
|
TokenizeError("cannot ReadData, the remaining size is too small for the data type: " + std::string(&type, 1), input, cursor);
|
|
}
|
|
|
|
// the type code is contained in the returned range
|
|
send_out = cursor;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
bool ReadScope(TokenList &output_tokens, const char *input, const char *&cursor, const char *end, bool const is64bits) {
|
|
// the first word contains the offset at which this block ends
|
|
const uint64_t end_offset = is64bits ? ReadDoubleWord(input, cursor, end) : ReadWord(input, cursor, end);
|
|
|
|
// we may get 0 if reading reached the end of the file -
|
|
// fbx files have a mysterious extra footer which I don't know
|
|
// how to extract any information from, but at least it always
|
|
// starts with a 0.
|
|
if (!end_offset) {
|
|
return false;
|
|
}
|
|
|
|
if (end_offset > Offset(input, end)) {
|
|
TokenizeError("block offset is out of range", input, cursor);
|
|
} else if (end_offset < Offset(input, cursor)) {
|
|
TokenizeError("block offset is negative out of range", input, cursor);
|
|
}
|
|
|
|
// the second data word contains the number of properties in the scope
|
|
const uint64_t prop_count = is64bits ? ReadDoubleWord(input, cursor, end) : ReadWord(input, cursor, end);
|
|
|
|
// the third data word contains the length of the property list
|
|
const uint64_t prop_length = is64bits ? ReadDoubleWord(input, cursor, end) : ReadWord(input, cursor, end);
|
|
|
|
// now comes the name of the scope/key
|
|
const char *sbeg, *send;
|
|
ReadString(sbeg, send, input, cursor, end);
|
|
|
|
output_tokens.push_back(new_Token(sbeg, send, TokenType_KEY, Offset(input, cursor)));
|
|
|
|
// now come the individual properties
|
|
const char *begin_cursor = cursor;
|
|
for (unsigned int i = 0; i < prop_count; ++i) {
|
|
ReadData(sbeg, send, input, cursor, begin_cursor + prop_length);
|
|
|
|
output_tokens.push_back(new_Token(sbeg, send, TokenType_DATA, Offset(input, cursor)));
|
|
|
|
if (i != prop_count - 1) {
|
|
output_tokens.push_back(new_Token(cursor, cursor + 1, TokenType_COMMA, Offset(input, cursor)));
|
|
}
|
|
}
|
|
|
|
if (Offset(begin_cursor, cursor) != prop_length) {
|
|
TokenizeError("property length not reached, something is wrong", input, cursor);
|
|
}
|
|
|
|
// at the end of each nested block, there is a NUL record to indicate
|
|
// that the sub-scope exists (i.e. to distinguish between P: and P : {})
|
|
// this NUL record is 13 bytes long on 32 bit version and 25 bytes long on 64 bit.
|
|
const size_t sentinel_block_length = is64bits ? (sizeof(uint64_t) * 3 + 1) : (sizeof(uint32_t) * 3 + 1);
|
|
|
|
if (Offset(input, cursor) < end_offset) {
|
|
if (end_offset - Offset(input, cursor) < sentinel_block_length) {
|
|
TokenizeError("insufficient padding bytes at block end", input, cursor);
|
|
}
|
|
|
|
output_tokens.push_back(new_Token(cursor, cursor + 1, TokenType_OPEN_BRACKET, Offset(input, cursor)));
|
|
|
|
// XXX this is vulnerable to stack overflowing ..
|
|
while (Offset(input, cursor) < end_offset - sentinel_block_length) {
|
|
ReadScope(output_tokens, input, cursor, input + end_offset - sentinel_block_length, is64bits);
|
|
}
|
|
output_tokens.push_back(new_Token(cursor, cursor + 1, TokenType_CLOSE_BRACKET, Offset(input, cursor)));
|
|
|
|
for (unsigned int i = 0; i < sentinel_block_length; ++i) {
|
|
if (cursor[i] != '\0') {
|
|
TokenizeError("failed to read nested block sentinel, expected all bytes to be 0", input, cursor);
|
|
}
|
|
}
|
|
cursor += sentinel_block_length;
|
|
}
|
|
|
|
if (Offset(input, cursor) != end_offset) {
|
|
TokenizeError("scope length not reached, something is wrong", input, cursor);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
} // anonymous namespace
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
// TODO: Test FBX Binary files newer than the 7500 version to check if the 64 bits address behaviour is consistent
|
|
void TokenizeBinary(TokenList &output_tokens, const char *input, size_t length) {
|
|
if (length < 0x1b) {
|
|
//TokenizeError("file is too short",0);
|
|
}
|
|
|
|
//uint32_t offset = 0x15;
|
|
/* const char* cursor = input + 0x15;
|
|
const uint32_t flags = ReadWord(input, cursor, input + length);
|
|
const uint8_t padding_0 = ReadByte(input, cursor, input + length); // unused
|
|
const uint8_t padding_1 = ReadByte(input, cursor, input + length); // unused*/
|
|
|
|
if (strncmp(input, "Kaydara FBX Binary", 18)) {
|
|
TokenizeError("magic bytes not found", 0);
|
|
}
|
|
|
|
const char *cursor = input + 18;
|
|
/*Result ignored*/ ReadByte(input, cursor, input + length);
|
|
/*Result ignored*/ ReadByte(input, cursor, input + length);
|
|
/*Result ignored*/ ReadByte(input, cursor, input + length);
|
|
/*Result ignored*/ ReadByte(input, cursor, input + length);
|
|
/*Result ignored*/ ReadByte(input, cursor, input + length);
|
|
const uint32_t version = ReadWord(input, cursor, input + length);
|
|
print_verbose("FBX Version: " + itos(version));
|
|
//ASSIMP_LOG_DEBUG_F("FBX version: ", version);
|
|
const bool is64bits = version >= 7500;
|
|
const char *end = input + length;
|
|
while (cursor < end) {
|
|
if (!ReadScope(output_tokens, input, cursor, input + length, is64bits)) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
} // namespace FBXDocParser
|