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/* 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/debug.h"
#include "common/stream.h"
#include "common/textconsole.h"
#include "chewy/chewy.h"
#include "chewy/resource.h"
namespace Chewy {
Resource::Resource(Common::String filename) {
_stream.open(filename);
uint32 magicBytes = MKTAG('N', 'G', 'S', '\0');
if (_stream.readUint32BE() != magicBytes)
error("Invalid resource - %s", filename.c_str());
_resType = (ResourceType)_stream.readUint16LE();
_chunkCount = _stream.readUint16LE();
for (uint i = 0; i < _chunkCount; i++) {
Chunk cur;
cur.size = _stream.readUint32LE();
cur.type = (ResourceType)_stream.readUint16LE();
cur.pos = _stream.pos();
_stream.skip(cur.size);
_chunkList.push_back(cur);
}
}
Resource::~Resource() {
_chunkList.clear();
_stream.close();
}
uint32 Resource::getChunkCount() const {
return _chunkList.size();
}
Chunk *Resource::getChunk(int num) {
return &_chunkList[num];
}
byte *Resource::getChunkData(int num) {
Chunk *chunk = &_chunkList[num];
byte *data = new byte[chunk->size];
_stream.seek(chunk->pos, SEEK_SET);
_stream.read(data, chunk->size);
return data;
}
TBFChunk *BackgroundResource::getImage(int num) {
Chunk *chunk = &_chunkList[num];
TBFChunk *tbf = new TBFChunk();
_stream.seek(chunk->pos, SEEK_SET);
if (_stream.readUint32BE() != MKTAG('T', 'B', 'F', '\0'))
error("Corrupt TBF resource");
tbf->screenMode = _stream.readUint16LE();
tbf->compressionFlag = _stream.readUint16LE();
tbf->size = _stream.readUint32LE();
tbf->width = _stream.readUint16LE();
tbf->height = _stream.readUint16LE();
for (int j = 0; j < 3 * 256; j++)
tbf->palette[j] = _stream.readByte() << 2;
tbf->data = new byte[tbf->size];
if (!tbf->compressionFlag) {
_stream.read(tbf->data, chunk->size);
}
else {
// Compressed images are packed using a very simple RLE compression
byte count;
byte value;
uint32 outPos = 0;
for (uint i = 0; i < (chunk->size) / 2 && outPos < tbf->size; i++) {
count = _stream.readByte();
value = _stream.readByte();
for (byte j = 0; j < count; j++) {
tbf->data[outPos++] = value;
}
}
}
return tbf;
}
SoundChunk *SoundResource::getSound(int num) {
Chunk *chunk = &_chunkList[num];
SoundChunk *sound = new SoundChunk();
_stream.seek(chunk->pos, SEEK_SET);
// Voice files are split in blocks, so reassemble them here
byte blocksRemaining;
uint32 totalLength = 0;
uint32 blockSize;
// Find the total length of the voice file
do {
blocksRemaining = _stream.readByte();
blockSize =
_stream.readByte() +
(_stream.readByte() << 8) +
(_stream.readByte() << 16);
totalLength += blockSize;
_stream.skip(blockSize);
} while (blocksRemaining > 1);
// Read the voice data
sound->size = totalLength;
sound->data = new byte[totalLength];
byte *ptr = sound->data;
_stream.seek(chunk->pos, SEEK_SET);
do {
blocksRemaining = _stream.readByte();
blockSize =
_stream.readByte() +
(_stream.readByte() << 8) +
(_stream.readByte() << 16);
_stream.read(ptr, blockSize);
ptr += blockSize;
} while (blocksRemaining > 1);
return sound;
}
} // End of namespace Chewy
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