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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. | ||
| * | ||
| */ | ||
|
|
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| #include "sherlock/decompress.h" | ||
|
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| namespace Sherlock { | ||
|
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| /** | ||
| * Decompresses an LZW compressed resource. If no outSize is specified, it will | ||
| * decompress the entire resource. If, however, an explicit size is specified, | ||
| * then it means we're already within a resource, and only want to decompress | ||
| * part of it. | ||
| */ | ||
| Common::SeekableReadStream *decompressLZ(Common::SeekableReadStream &source, int32 outSize) { | ||
| if (outSize == -1) { | ||
| source.seek(5); | ||
| outSize = source.readSint32LE(); | ||
| } | ||
|
|
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| byte lzWindow[4096]; | ||
| uint16 lzWindowPos; | ||
| uint16 cmd; | ||
|
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| byte *outBuffer = new byte[outSize]; | ||
| byte *outBufferEnd = outBuffer + outSize; | ||
| Common::MemoryReadStream *outS = new Common::MemoryReadStream(outBuffer, outSize, DisposeAfterUse::YES); | ||
|
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| memset(lzWindow, 0xFF, 0xFEE); | ||
| lzWindowPos = 0xFEE; | ||
| cmd = 0; | ||
|
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| do { | ||
| cmd >>= 1; | ||
| if (!(cmd & 0x100)) | ||
| cmd = source.readByte() | 0xFF00; | ||
|
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| if (cmd & 1) { | ||
| byte literal = source.readByte(); | ||
| *outBuffer++ = literal; | ||
| lzWindow[lzWindowPos] = literal; | ||
| lzWindowPos = (lzWindowPos + 1) & 0x0FFF; | ||
| } else { | ||
| int copyPos, copyLen; | ||
| copyPos = source.readByte(); | ||
| copyLen = source.readByte(); | ||
| copyPos = copyPos | ((copyLen & 0xF0) << 4); | ||
| copyLen = (copyLen & 0x0F) + 3; | ||
| while (copyLen--) { | ||
| byte literal = lzWindow[copyPos]; | ||
| copyPos = (copyPos + 1) & 0x0FFF; | ||
| *outBuffer++ = literal; | ||
| lzWindow[lzWindowPos] = literal; | ||
| lzWindowPos = (lzWindowPos + 1) & 0x0FFF; | ||
| } | ||
| } | ||
| } while (outBuffer < outBufferEnd); | ||
|
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| return outS; | ||
| } | ||
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| /** | ||
| * Decompresses a Rose Tattoo resource | ||
| * | ||
| Common::SeekableReadStream *decompress32(Common::SeekableReadStream &source, int32 outSize) { | ||
| if (outSize == -1) { | ||
| outSize = source.readSint32LE(); | ||
| } | ||
| byte lzWindow[8192]; | ||
| byte *outBuffer = new byte[outSize]; | ||
| byte *outBufferEnd = outBuffer + outSize; | ||
| Common::MemoryReadStream *outS = new Common::MemoryReadStream(outBuffer, outSize, DisposeAfterUse::YES); | ||
| memset(lzWindow, 0xFF, 8192); | ||
| int lzWindowPos = 0xFEE; | ||
| int cmd = 0; | ||
| do { | ||
| cmd >>= 1; | ||
| if (!(cmd & 0x100)) | ||
| cmd = source.readByte() | 0xFF00; | ||
| if (cmd & 1) { | ||
| byte literal = source.readByte(); | ||
| *outBuffer++ = literal; | ||
| lzWindow[lzWindowPos] = literal; | ||
| lzWindowPos = (lzWindowPos + 1) & 0x0FFF; | ||
| } else { | ||
| int copyPos, copyLen; | ||
| copyPos = source.readByte(); | ||
| copyLen = source.readByte(); | ||
| copyPos = copyPos | ((copyLen & 0xF0) << 4); | ||
| copyLen = (copyLen & 0x0F) + 3; | ||
| while (copyLen--) { | ||
| byte literal = lzWindow[copyPos]; | ||
| copyPos = (copyPos + 1) & 0x0FFF; | ||
| *outBuffer++ = literal; | ||
| lzWindow[lzWindowPos] = literal; | ||
| lzWindowPos = (lzWindowPos + 1) & 0x0FFF; | ||
| } | ||
| } | ||
| } while (outBuffer < outBufferEnd); | ||
| return outS; | ||
| } | ||
| */ | ||
|
|
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| } // namespace Sherlock |
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