mirror of
https://github.com/libretro/scummvm.git
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126 lines
3.0 KiB
C++
126 lines
3.0 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "common/iff_container.h"
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#include "common/substream.h"
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#include "common/util.h"
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namespace Common {
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IFFParser::IFFParser(ReadStream *stream, bool disposeStream) : _stream(stream), _disposeStream(disposeStream) {
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setInputStream(stream);
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}
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IFFParser::~IFFParser() {
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if (_disposeStream) {
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delete _stream;
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}
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_stream = nullptr;
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}
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void IFFParser::setInputStream(ReadStream *stream) {
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assert(stream);
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_formChunk.setInputStream(stream);
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_chunk.setInputStream(stream);
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_formChunk.readHeader();
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if (_formChunk.id != ID_FORM) {
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error("IFFParser input is not a FORM type IFF file");
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}
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_formSize = _formChunk.size;
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_formType = _formChunk.readUint32BE();
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}
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void IFFParser::parse(IFFCallback &callback) {
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bool stop;
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do {
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_chunk.feed();
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_formChunk.incBytesRead(_chunk.size);
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if (_formChunk.hasReadAll()) {
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break;
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}
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_formChunk.incBytesRead(8);
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_chunk.readHeader();
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// invoke the callback
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SubReadStream stream(&_chunk, _chunk.size);
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IFFChunk chunk(_chunk.id, _chunk.size, &stream);
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stop = callback(chunk);
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// eats up all the remaining data in the chunk
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while (!stream.eos()) {
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stream.readByte();
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}
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} while (!stop);
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}
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PackBitsReadStream::PackBitsReadStream(Common::ReadStream &input) : _input(&input) {
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}
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PackBitsReadStream::~PackBitsReadStream() {
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}
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bool PackBitsReadStream::eos() const {
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return _input->eos();
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}
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uint32 PackBitsReadStream::read(void *dataPtr, uint32 dataSize) {
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byte *out = (byte *)dataPtr;
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uint32 left = dataSize;
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uint32 lenR = 0, lenW = 0;
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while (left > 0 && !_input->eos()) {
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lenR = _input->readByte();
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if (lenR == 128) {
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// no-op
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lenW = 0;
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} else if (lenR <= 127) {
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// literal run
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lenR++;
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lenW = MIN(lenR, left);
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for (uint32 j = 0; j < lenW; j++) {
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*out++ = _input->readByte();
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}
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for (; lenR > lenW; lenR--) {
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_input->readByte();
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}
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} else { // len > 128
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// expand run
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lenW = MIN((256 - lenR) + 1, left);
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byte val = _input->readByte();
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memset(out, val, lenW);
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out += lenW;
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}
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left -= lenW;
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}
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return dataSize - left;
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}
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} // End of namespace Common
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