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https://github.com/libretro/scummvm.git
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fc0988fdfc
The IFF format used in the Nancy Drew engine uses a non-standard id that reads DATA instead of FORM, though the rest of the format is identical. This commit allows such nonstandard ids to be used without needing to massage the data first.
125 lines
3.0 KiB
C++
125 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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "common/formats/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, IFF_ID formHeaderID) : _stream(stream), _disposeStream(disposeStream), _formHeaderID(formHeaderID) {
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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 != _formHeaderID) {
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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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