mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-26 19:55:44 +00:00
126 lines
3.0 KiB
C++
126 lines
3.0 KiB
C++
/* ScummVM - Graphic Adventure Engine
|
|
*
|
|
* ScummVM 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 2
|
|
* 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, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
*/
|
|
|
|
#include "common/iff_container.h"
|
|
#include "common/substream.h"
|
|
#include "common/util.h"
|
|
|
|
namespace Common {
|
|
|
|
IFFParser::IFFParser(ReadStream *stream, bool disposeStream) : _stream(stream), _disposeStream(disposeStream) {
|
|
setInputStream(stream);
|
|
}
|
|
|
|
IFFParser::~IFFParser() {
|
|
if (_disposeStream) {
|
|
delete _stream;
|
|
}
|
|
_stream = 0;
|
|
}
|
|
|
|
void IFFParser::setInputStream(ReadStream *stream) {
|
|
assert(stream);
|
|
_formChunk.setInputStream(stream);
|
|
_chunk.setInputStream(stream);
|
|
|
|
_formChunk.readHeader();
|
|
if (_formChunk.id != ID_FORM) {
|
|
error("IFFParser input is not a FORM type IFF file");
|
|
}
|
|
_formSize = _formChunk.size;
|
|
_formType = _formChunk.readUint32BE();
|
|
}
|
|
|
|
void IFFParser::parse(IFFCallback &callback) {
|
|
bool stop;
|
|
do {
|
|
_chunk.feed();
|
|
_formChunk.incBytesRead(_chunk.size);
|
|
|
|
if (_formChunk.hasReadAll()) {
|
|
break;
|
|
}
|
|
|
|
_formChunk.incBytesRead(8);
|
|
_chunk.readHeader();
|
|
|
|
// invoke the callback
|
|
SubReadStream stream(&_chunk, _chunk.size);
|
|
IFFChunk chunk(_chunk.id, _chunk.size, &stream);
|
|
stop = callback(chunk);
|
|
|
|
// eats up all the remaining data in the chunk
|
|
while (!stream.eos()) {
|
|
stream.readByte();
|
|
}
|
|
|
|
} while (!stop);
|
|
}
|
|
|
|
|
|
PackBitsReadStream::PackBitsReadStream(Common::ReadStream &input) : _input(&input) {
|
|
}
|
|
|
|
PackBitsReadStream::~PackBitsReadStream() {
|
|
}
|
|
|
|
bool PackBitsReadStream::eos() const {
|
|
return _input->eos();
|
|
}
|
|
|
|
uint32 PackBitsReadStream::read(void *dataPtr, uint32 dataSize) {
|
|
byte *out = (byte *)dataPtr;
|
|
uint32 left = dataSize;
|
|
|
|
uint32 lenR = 0, lenW = 0;
|
|
while (left > 0 && !_input->eos()) {
|
|
lenR = _input->readByte();
|
|
|
|
if (lenR == 128) {
|
|
// no-op
|
|
lenW = 0;
|
|
} else if (lenR <= 127) {
|
|
// literal run
|
|
lenR++;
|
|
lenW = MIN(lenR, left);
|
|
for (uint32 j = 0; j < lenW; j++) {
|
|
*out++ = _input->readByte();
|
|
}
|
|
for (; lenR > lenW; lenR--) {
|
|
_input->readByte();
|
|
}
|
|
} else { // len > 128
|
|
// expand run
|
|
lenW = MIN((256 - lenR) + 1, left);
|
|
byte val = _input->readByte();
|
|
memset(out, val, lenW);
|
|
out += lenW;
|
|
}
|
|
|
|
left -= lenW;
|
|
}
|
|
|
|
return dataSize - left;
|
|
}
|
|
|
|
} // End of namespace Common
|