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/* 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"
namespace Saga {
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;
}
}
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