diff options
Diffstat (limited to 'saga/binread.cpp')
| -rw-r--r-- | saga/binread.cpp | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/saga/binread.cpp b/saga/binread.cpp new file mode 100644 index 0000000000..06715dd730 --- /dev/null +++ b/saga/binread.cpp @@ -0,0 +1,164 @@ +/* ScummVM - Scumm Interpreter + * Copyright (C) 2003 The ScummVM project + * + * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * $Header$ + * + */ + +#include "common/stdafx.h" + +#include "binread.h" + +BinReader::BinReader() { + _buf = NULL; + _bufPtr = NULL; + _bufEnd = NULL; + _bufLen = 0; +} + +BinReader::BinReader( const byte *buf, size_t buflen ) { + _buf = buf; + _bufPtr = buf; + _bufEnd = buf + buflen; + _bufLen = buflen; +} + +BinReader::~BinReader() { + +} + +void BinReader::setBuf( const byte *buf, size_t buflen ) +{ + _buf = buf; + _bufPtr = buf; + _bufEnd = buf + buflen; + _bufLen = buflen; +} + +void BinReader::skip( size_t skip_ct ) +{ + assert(( _bufPtr + skip_ct ) <= _bufEnd ); + + _bufPtr += skip_ct; +} + +unsigned int BinReader::readUint16LE() { + + assert(( _bufPtr + 2 ) <= _bufEnd ); + + unsigned int u16_le = ((unsigned int)_bufPtr[1] << 8 ) | _bufPtr[0]; + + _bufPtr += 2; + + return u16_le; +} + +unsigned int BinReader::readUint16BE() { + + assert(( _bufPtr + 2 ) <= _bufEnd ); + + unsigned int u16_be = ((unsigned int)_bufPtr[0] << 8 ) | _bufPtr[1]; + + _bufPtr += 2; + + return u16_be; +} + +int BinReader::readSint16LE() { + + assert(( _bufPtr + 2 ) <= _bufEnd ); + + unsigned int u16_le = ((unsigned int)_bufPtr[1] << 8 ) | _bufPtr[0]; + + _bufPtr += 2; + + return u16_le; +} + +int BinReader::readSint16BE() { + + assert(( _bufPtr + 2 ) <= _bufEnd ); + + unsigned int u16_be = ((unsigned int)_bufPtr[0] << 8 ) | _bufPtr[1]; + + _bufPtr += 2; + + return u16_be; +} + + +uint32 BinReader::readUint32LE() +{ + + assert(( _bufPtr + 4 ) <= _bufEnd ); + + unsigned long u32_le = ((unsigned long)_bufPtr[3] << 24 ) | + ((unsigned long)_bufPtr[2] << 16 ) | + ((unsigned long)_bufPtr[1] << 8 ) | + _bufPtr[0]; + + _bufPtr += 4; + + return u32_le; +} + +uint32 BinReader::readUint32BE() +{ + + assert(( _bufPtr + 4 ) <= _bufEnd ); + + unsigned long u32_be = ((unsigned long)_bufPtr[0] << 24 ) | + ((unsigned long)_bufPtr[1] << 16 ) | + ((unsigned long)_bufPtr[2] << 8 ) | + _bufPtr[3]; + + _bufPtr += 4; + + return u32_be; +} + +int32 BinReader::readSint32LE() +{ + + assert(( _bufPtr + 4 ) <= _bufEnd ); + + unsigned long u32_le = ((unsigned long)_bufPtr[3] << 24 ) | + ((unsigned long)_bufPtr[2] << 16 ) | + ((unsigned long)_bufPtr[1] << 8 ) | + _bufPtr[0]; + + _bufPtr += 4; + + return u32_le; +} + +int32 BinReader::readSint32BE() +{ + + assert(( _bufPtr + 4 ) <= _bufEnd ); + + unsigned long u32_be = ((unsigned long)_bufPtr[0] << 24 ) | + ((unsigned long)_bufPtr[1] << 16 ) | + ((unsigned long)_bufPtr[2] << 8 ) | + _bufPtr[3]; + + _bufPtr += 4; + + return u32_be; +} + + |