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Diffstat (limited to 'common/bitstream.cpp')
| -rw-r--r-- | common/bitstream.cpp | 217 |
1 files changed, 0 insertions, 217 deletions
diff --git a/common/bitstream.cpp b/common/bitstream.cpp deleted file mode 100644 index b41ad237e0..0000000000 --- a/common/bitstream.cpp +++ /dev/null @@ -1,217 +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. - * - */ - -// Based on eos' BitStream implementation - -#include "common/bitstream.h" -#include "common/memstream.h" -#include "common/stream.h" -#include "common/textconsole.h" -#include "common/util.h" - -namespace Common { - -BitStream::BitStream() { -} - -BitStream::~BitStream() { -} - -void BitStream::skip(uint32 n) { - while (n-- > 0) - getBit(); -} - - -BitStreamBE::BitStreamBE(SeekableReadStream &stream, uint32 bitCount) : _value(0), _inValue(0) { - if ((bitCount % 8) != 0) - error("Big-endian bit stream size has to be divisible by 8"); - - // Read the number of bytes of the stream - - uint32 byteSize = bitCount / 8; - byte *data = (byte *)malloc(byteSize); - - if (stream.read(data, byteSize) != byteSize) { - free(data); - error("Bad BitStreamBE size"); - } - - _stream = new MemoryReadStream(data, byteSize, DisposeAfterUse::YES); -} - -BitStreamBE::BitStreamBE(const byte *data, uint32 bitCount) : _value(0), _inValue(0) { - if ((bitCount % 8) != 0) - error("Big-endian bit stream size has to be divisible by 8"); - - // Copy the number of bytes from the data array - - uint32 byteSize = bitCount / 8; - byte *dataN = (byte *)malloc(byteSize); - - memcpy(dataN, data, byteSize); - - _stream = new MemoryReadStream(dataN, byteSize, DisposeAfterUse::YES); -} - -BitStreamBE::~BitStreamBE() { - delete _stream; -} - -uint32 BitStreamBE::getBit() { - if (_inValue == 0) { - // Need to get new byte - - if (_stream->eos()) - error("End of bit stream reached"); - - _value = _stream->readByte(); - } - - // Get the current bit - int b = ((_value & 0x80) == 0) ? 0 : 1; - - // Shift to the next bit - _value <<= 1; - - // Increase the position within the current byte - _inValue = (_inValue + 1) % 8; - - return b; -} - -uint32 BitStreamBE::getBits(uint32 n) { - if (n > 32) - error("Too many bits requested to be read"); - - // Read the number of bits - uint32 v = 0; - while (n-- > 0) - v = (v << 1) | getBit(); - - return v; -} - -void BitStreamBE::addBit(uint32 &x, uint32 n) { - x = (x << 1) | getBit(); -} - -uint32 BitStreamBE::pos() const { - if (_stream->pos() == 0) - return 0; - - uint32 p = (_inValue == 0) ? _stream->pos() : (_stream->pos() - 1); - return p * 8 + _inValue; -} - -uint32 BitStreamBE::size() const { - return _stream->size() * 8; -} - - -BitStream32LE::BitStream32LE(SeekableReadStream &stream, uint32 bitCount) : _value(0), _inValue(0) { - if ((bitCount % 32) != 0) - error("32bit little-endian bit stream size has to be divisible by 32"); - - // Read the number of bytes of the stream - - uint32 byteSize = bitCount / 8; - byte *data = (byte *)malloc(byteSize); - - if (stream.read(data, byteSize) != byteSize) { - free(data); - error("Bad BitStream32LE size"); - } - - _stream = new MemoryReadStream(data, byteSize, DisposeAfterUse::YES); -} - -BitStream32LE::BitStream32LE(const byte *data, uint32 bitCount) : _value(0), _inValue(0) { - if ((bitCount % 32) != 0) - error("32bit little-endian bit stream size has to be divisible by 32"); - - // Copy the number of bytes from the data array - - uint32 byteSize = bitCount / 8; - byte *dataN = (byte *)malloc(byteSize); - - memcpy(dataN, data, byteSize); - - _stream = new MemoryReadStream(dataN, byteSize, DisposeAfterUse::YES); -} - -BitStream32LE::~BitStream32LE() { - delete _stream; -} - -uint32 BitStream32LE::getBit() { - if (_inValue == 0) { - // Need to get new 32bit value - - if (_stream->eos()) - error("End of bit stream reached"); - - _value = _stream->readUint32LE(); - } - - // Get the current bit - int b = ((_value & 1) == 0) ? 0 : 1; - - // Shift to the next bit - _value >>= 1; - - // Increase the position within the current byte - _inValue = (_inValue + 1) % 32; - - return b; -} - -uint32 BitStream32LE::getBits(uint32 n) { - if (n > 32) - error("Too many bits requested to be read"); - - // Read the number of bits - uint32 v = 0; - for (uint32 i = 0; i < n; i++) - v = (v >> 1) | (((uint32) getBit()) << 31); - - v >>= (32 - n); - return v; -} - -void BitStream32LE::addBit(uint32 &x, uint32 n) { - x = (x & ~(1 << n)) | (getBit() << n); -} - -uint32 BitStream32LE::pos() const { - if (_stream->pos() == 0) - return 0; - - uint32 p = ((_inValue == 0) ? _stream->pos() : (_stream->pos() - 1)) & 0xFFFFFFFC; - return p * 8 + _inValue; -} - -uint32 BitStream32LE::size() const { - return _stream->size() * 8; -} - -} // End of namespace Common |