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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,171 +1,171 @@ | ||
| /* 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. | ||
| * | ||
| */ | ||
|
|
||
| // John_Doe's implementation | ||
|
|
||
| #include "prince/decompress.h" | ||
|
|
||
| namespace Prince { | ||
|
|
||
| static const uint16 table1[] = { | ||
| 0x8000, 0x0002, | ||
| 0x4000, 0x0004, | ||
| 0x2000, 0x0008, | ||
| 0x1000, 0x0010, | ||
| 0x0800, 0x0020, | ||
| 0x0400, 0x0040, | ||
| 0x0200, 0x0080, | ||
| 0x0100, 0x0100, | ||
| 0x0080, 0x0200, | ||
| 0x0040, 0x0400 | ||
| }; | ||
|
|
||
| static const uint32 table2[] = { | ||
| 0x0000F000, | ||
| 0x0020FC00, | ||
| 0x00A0FF00, | ||
| 0x02A0FF80, | ||
| 0x06A0FFC0, | ||
| 0x0EA0FFE0, | ||
| 0x1EA0FFF0, | ||
| 0x3EA0FFF8 | ||
| }; | ||
|
|
||
| static const uint16 table3[] = { | ||
| 0x8000, 0x0000, | ||
| 0x4000, 0x0002, | ||
| 0x2000, 0x0006, | ||
| 0x1000, 0x000E, | ||
| 0x0800, 0x001E, | ||
| 0x0400, 0x003E, | ||
| 0x0200, 0x007E, | ||
| 0x0100, 0x00FE, | ||
| 0x0080, 0x01FE, | ||
| 0x0040, 0x03FE, | ||
| 0x0020, 0x07FE, | ||
| 0x0010, 0x0FFE, | ||
| 0x0008, 0x1FFE, | ||
| 0x0004, 0x3FFE, | ||
| 0x0002, 0x7FFE, | ||
| 0x0001, 0xFFFE | ||
| }; | ||
|
|
||
| void Decompressor::decompress(byte *source, byte *dest, uint32 destSize) { | ||
| byte *destEnd = dest + destSize; | ||
| int more; | ||
| _src = source; | ||
| _dst = dest; | ||
| _bitBuffer = 0x80; | ||
| while (_dst < destEnd) { | ||
| uint32 ebp; | ||
| uint16 offset, length; | ||
| if (getBit()) { | ||
| if (getBit()) { | ||
| if (getBit()) { | ||
| if (getBit()) { | ||
| if (getBit()) { | ||
| if (getBit()) { | ||
| uint32 tableIndex = 0; | ||
| while (getBit()) | ||
| tableIndex++; | ||
| length = table3[tableIndex * 2 + 0]; | ||
| do { | ||
| more = !(length & 0x8000); | ||
| length = (length << 1) | getBit(); | ||
| } while (more); | ||
| length += table3[tableIndex * 2 + 1]; | ||
| length++; | ||
| memcpy(_dst, _src, length); | ||
| _src += length; | ||
| _dst += length; | ||
| } | ||
| *_dst++ = *_src++; | ||
| } | ||
| *_dst++ = *_src++; | ||
| } | ||
| *_dst++ = *_src++; | ||
| } | ||
| *_dst++ = *_src++; | ||
| } | ||
| *_dst++ = *_src++; | ||
| } | ||
| if (!getBit()) { | ||
| if (getBit()) { | ||
| uint32 tableIndex = getBit(); | ||
| tableIndex = (tableIndex << 1) | getBit(); | ||
| tableIndex = (tableIndex << 1) | getBit(); | ||
| ebp = table2[tableIndex]; | ||
| length = 1; | ||
| } else { | ||
| ebp = 0x0000FF00; | ||
| length = 0; | ||
| } | ||
| } else { | ||
| uint32 tableIndex = 0; | ||
| while (getBit()) | ||
| tableIndex++; | ||
| length = table1[tableIndex * 2 + 0]; | ||
| do { | ||
| more = !(length & 0x8000); | ||
| length = (length << 1) | getBit(); | ||
| } while (more); | ||
| length += table1[tableIndex * 2 + 1]; | ||
| tableIndex = getBit(); | ||
| tableIndex = (tableIndex << 1) | getBit(); | ||
| tableIndex = (tableIndex << 1) | getBit(); | ||
| ebp = table2[tableIndex]; | ||
| } | ||
| offset = ebp & 0xFFFF; | ||
| do { | ||
| if (_bitBuffer == 0x80) { | ||
| if (offset >= 0xFF00) { | ||
| offset = (offset << 8) | *_src++; | ||
| } | ||
| } | ||
| more = offset & 0x8000; | ||
| offset = (offset << 1) | getBit(); | ||
| } while (more); | ||
| offset += (ebp >> 16); | ||
| length += 2; | ||
| while (length--) { | ||
| if (_dst >= destEnd) { | ||
| return; | ||
| } | ||
| *_dst = *(_dst - offset); | ||
| _dst++; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| int Decompressor::getBit() { | ||
| int bit = (_bitBuffer & 0x80) >> 7; | ||
| _bitBuffer <<= 1; | ||
| if (_bitBuffer == 0) { | ||
| _bitBuffer = *_src++; | ||
| bit = (_bitBuffer & 0x80) >> 7; | ||
| _bitBuffer <<= 1; | ||
| _bitBuffer |= 1; | ||
| } | ||
| return bit; | ||
| } | ||
|
|
||
| } // End of namespace Prince | ||
| /* 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. | ||
| * | ||
| */ | ||
|
|
||
| // John_Doe's implementation | ||
|
|
||
| #include "prince/decompress.h" | ||
|
|
||
| namespace Prince { | ||
|
|
||
| static const uint16 table1[] = { | ||
| 0x8000, 0x0002, | ||
| 0x4000, 0x0004, | ||
| 0x2000, 0x0008, | ||
| 0x1000, 0x0010, | ||
| 0x0800, 0x0020, | ||
| 0x0400, 0x0040, | ||
| 0x0200, 0x0080, | ||
| 0x0100, 0x0100, | ||
| 0x0080, 0x0200, | ||
| 0x0040, 0x0400 | ||
| }; | ||
|
|
||
| static const uint32 table2[] = { | ||
| 0x0000F000, | ||
| 0x0020FC00, | ||
| 0x00A0FF00, | ||
| 0x02A0FF80, | ||
| 0x06A0FFC0, | ||
| 0x0EA0FFE0, | ||
| 0x1EA0FFF0, | ||
| 0x3EA0FFF8 | ||
| }; | ||
|
|
||
| static const uint16 table3[] = { | ||
| 0x8000, 0x0000, | ||
| 0x4000, 0x0002, | ||
| 0x2000, 0x0006, | ||
| 0x1000, 0x000E, | ||
| 0x0800, 0x001E, | ||
| 0x0400, 0x003E, | ||
| 0x0200, 0x007E, | ||
| 0x0100, 0x00FE, | ||
| 0x0080, 0x01FE, | ||
| 0x0040, 0x03FE, | ||
| 0x0020, 0x07FE, | ||
| 0x0010, 0x0FFE, | ||
| 0x0008, 0x1FFE, | ||
| 0x0004, 0x3FFE, | ||
| 0x0002, 0x7FFE, | ||
| 0x0001, 0xFFFE | ||
| }; | ||
|
|
||
| void Decompressor::decompress(byte *source, byte *dest, uint32 destSize) { | ||
| byte *destEnd = dest + destSize; | ||
| int more; | ||
| _src = source; | ||
| _dst = dest; | ||
| _bitBuffer = 0x80; | ||
| while (_dst < destEnd) { | ||
| uint32 ebp; | ||
| uint16 offset, length; | ||
| if (getBit()) { | ||
| if (getBit()) { | ||
| if (getBit()) { | ||
| if (getBit()) { | ||
| if (getBit()) { | ||
| if (getBit()) { | ||
| uint32 tableIndex = 0; | ||
| while (getBit()) | ||
| tableIndex++; | ||
| length = table3[tableIndex * 2 + 0]; | ||
| do { | ||
| more = !(length & 0x8000); | ||
| length = (length << 1) | getBit(); | ||
| } while (more); | ||
| length += table3[tableIndex * 2 + 1]; | ||
| length++; | ||
| memcpy(_dst, _src, length); | ||
| _src += length; | ||
| _dst += length; | ||
| } | ||
| *_dst++ = *_src++; | ||
| } | ||
| *_dst++ = *_src++; | ||
| } | ||
| *_dst++ = *_src++; | ||
| } | ||
| *_dst++ = *_src++; | ||
| } | ||
| *_dst++ = *_src++; | ||
| } | ||
| if (!getBit()) { | ||
| if (getBit()) { | ||
| uint32 tableIndex = getBit(); | ||
| tableIndex = (tableIndex << 1) | getBit(); | ||
| tableIndex = (tableIndex << 1) | getBit(); | ||
| ebp = table2[tableIndex]; | ||
| length = 1; | ||
| } else { | ||
| ebp = 0x0000FF00; | ||
| length = 0; | ||
| } | ||
| } else { | ||
| uint32 tableIndex = 0; | ||
| while (getBit()) | ||
| tableIndex++; | ||
| length = table1[tableIndex * 2 + 0]; | ||
| do { | ||
| more = !(length & 0x8000); | ||
| length = (length << 1) | getBit(); | ||
| } while (more); | ||
| length += table1[tableIndex * 2 + 1]; | ||
| tableIndex = getBit(); | ||
| tableIndex = (tableIndex << 1) | getBit(); | ||
| tableIndex = (tableIndex << 1) | getBit(); | ||
| ebp = table2[tableIndex]; | ||
| } | ||
| offset = ebp & 0xFFFF; | ||
| do { | ||
| if (_bitBuffer == 0x80) { | ||
| if (offset >= 0xFF00) { | ||
| offset = (offset << 8) | *_src++; | ||
| } | ||
| } | ||
| more = offset & 0x8000; | ||
| offset = (offset << 1) | getBit(); | ||
| } while (more); | ||
| offset += (ebp >> 16); | ||
| length += 2; | ||
| while (length--) { | ||
| if (_dst >= destEnd) { | ||
| return; | ||
| } | ||
| *_dst = *(_dst - offset); | ||
| _dst++; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| int Decompressor::getBit() { | ||
| int bit = (_bitBuffer & 0x80) >> 7; | ||
| _bitBuffer <<= 1; | ||
| if (_bitBuffer == 0) { | ||
| _bitBuffer = *_src++; | ||
| bit = (_bitBuffer & 0x80) >> 7; | ||
| _bitBuffer <<= 1; | ||
| _bitBuffer |= 1; | ||
| } | ||
| return bit; | ||
| } | ||
|
|
||
| } // End of namespace Prince |
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