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/* ScummVM Tools
*
* ScummVM Tools is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "engines/mohawk/utils.h"
#include "common/endian.h"
#include "common/util.h"
#define ATOM_STCO MKID_BE('stco')
#define ATOM_MOOV MKID_BE('moov')
#define ATOM_TRAK MKID_BE('trak')
#define ATOM_MDIA MKID_BE('mdia')
#define ATOM_MINF MKID_BE('minf')
#define ATOM_STBL MKID_BE('stbl')
#define BUF_SIZE 8192
void copyBytes(Common::File *src, Common::File *outputFile, uint32 bytesToCopy) {
byte tempBuffer[BUF_SIZE];
if (src->pos() + bytesToCopy > src->size()) {
error("Unexpected end of stream (pos: %d + bytesToCopy: %d > totalSize: %d",
src->pos(), bytesToCopy, src->size());
}
while (bytesToCopy > 0) {
size_t bytesCopied = src->read_noThrow(tempBuffer, MIN<uint32>(bytesToCopy, BUF_SIZE));
outputFile->write(tempBuffer, bytesCopied);
bytesToCopy -= bytesCopied;
}
}
void adjustQuickTimeAtomOffsets(Common::File *src, uint32 parentSize, int32 offset, Common::File *outputFile) {
static const uint32 kAtomHeaderSize = sizeof(uint32) + sizeof(uint32); // size, type
uint32 totalSize = 0;
while (totalSize + kAtomHeaderSize < parentSize) {
uint32 atomSize = src->readUint32BE();
uint32 atomType = src->readUint32BE();
outputFile->writeUint32BE(atomSize);
outputFile->writeUint32BE(atomType);
if (atomSize == 1) {
error("64 bit extended size is not supported in QuickTime");
}
if (atomSize < kAtomHeaderSize) {
error("Invalid atom size %d", atomSize);
}
if (atomType == ATOM_MOOV || atomType == ATOM_TRAK
|| atomType == ATOM_MDIA || atomType == ATOM_MINF
|| atomType == ATOM_STBL) {
// Recurse into container atom types
adjustQuickTimeAtomOffsets(src, atomSize - kAtomHeaderSize, offset, outputFile);
} else if (atomType == ATOM_STCO) {
copyBytes(src, outputFile, 4); // Copy flags
uint32 chunkCount = src->readUint32BE();
outputFile->writeUint32BE(chunkCount);
for (uint32 i = 0; i < chunkCount; i++) {
uint32 chunkOffset = src->readUint32BE() + offset;
outputFile->writeUint32BE(chunkOffset);
}
} else {
copyBytes(src, outputFile, atomSize - kAtomHeaderSize);
}
totalSize += atomSize;
}
if (totalSize != parentSize)
error("Unexpected position in atom %d (expected %d)", totalSize, parentSize);
}
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