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author | Filippos Karapetis | 2014-12-16 01:14:37 +0200 |
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committer | Filippos Karapetis | 2014-12-16 01:58:56 +0200 |
commit | d8a961244d99a87c1a01613a971173cc135c246a (patch) | |
tree | 0ef8ca6c14d1ad0ccf1a262edef8d2eb2fa674fd /engines/zvision/utility/lzss_read_stream.cpp | |
parent | 2463b4580436b41a46500e53b4868789c9c7b21e (diff) | |
download | scummvm-rg350-d8a961244d99a87c1a01613a971173cc135c246a.tar.gz scummvm-rg350-d8a961244d99a87c1a01613a971173cc135c246a.tar.bz2 scummvm-rg350-d8a961244d99a87c1a01613a971173cc135c246a.zip |
ZVISION: Move all the file-related classes together
Diffstat (limited to 'engines/zvision/utility/lzss_read_stream.cpp')
-rw-r--r-- | engines/zvision/utility/lzss_read_stream.cpp | 102 |
1 files changed, 0 insertions, 102 deletions
diff --git a/engines/zvision/utility/lzss_read_stream.cpp b/engines/zvision/utility/lzss_read_stream.cpp deleted file mode 100644 index bbe6e35f76..0000000000 --- a/engines/zvision/utility/lzss_read_stream.cpp +++ /dev/null @@ -1,102 +0,0 @@ -/* 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/scummsys.h" - -#include "zvision/utility/lzss_read_stream.h" - -namespace ZVision { - -LzssReadStream::LzssReadStream(Common::SeekableReadStream *source) - : _source(source), - // It's convention to set the starting cursor position to blockSize - 16 - _windowCursor(0x0FEE), - _eosFlag(false) { - // Clear the window to null - memset(_window, 0, BLOCK_SIZE); -} - -uint32 LzssReadStream::decompressBytes(byte *destination, uint32 numberOfBytes) { - uint32 destinationCursor = 0; - - while (destinationCursor < numberOfBytes) { - byte flagbyte = _source->readByte(); - if (_source->eos()) - break; - uint mask = 1; - - for (int i = 0; i < 8; ++i) { - if ((flagbyte & mask) == mask) { - byte data = _source->readByte(); - if (_source->eos()) { - return destinationCursor; - } - - _window[_windowCursor] = data; - destination[destinationCursor++] = data; - - // Increment and wrap the window cursor - _windowCursor = (_windowCursor + 1) & 0xFFF; - } else { - byte low = _source->readByte(); - if (_source->eos()) { - return destinationCursor; - } - - byte high = _source->readByte(); - if (_source->eos()) { - return destinationCursor; - } - - uint16 length = (high & 0xF) + 2; - uint16 offset = low | ((high & 0xF0) << 4); - - for (int j = 0; j <= length; ++j) { - byte temp = _window[(offset + j) & 0xFFF]; - _window[_windowCursor] = temp; - destination[destinationCursor++] = temp; - _windowCursor = (_windowCursor + 1) & 0xFFF; - } - } - - mask = mask << 1; - } - } - - return destinationCursor; -} - -bool LzssReadStream::eos() const { - return _eosFlag; -} - -uint32 LzssReadStream::read(void *dataPtr, uint32 dataSize) { - uint32 bytesRead = decompressBytes(static_cast<byte *>(dataPtr), dataSize); - if (bytesRead < dataSize) { - // Flag that we're at EOS - _eosFlag = true; - } - - return dataSize; -} - -} // End of namespace ZVision |