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/* ScummVM - Scumm Interpreter
* Copyright (C) 2002-2005 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 "stdafx.h"
#include "scumm/smush/chunk.h"
#include "scumm/scumm.h"
#include "common/file.h"
#include "common/str.h"
#include "common/util.h"
namespace Scumm {
const char *Chunk::ChunkString(Chunk::type t) {
static char data[5];
data[0] = (char)((t >> 24) & 0xFF);
data[1] = (char)((t >> 16) & 0xFF);
data[2] = (char)((t >> 8) & 0xFF);
data[3] = (char)((t >> 0) & 0xFF);
data[4] = 0;
return data;
}
BaseChunk::BaseChunk() :
_type(0),
_size(0),
_curPos(0) {
}
bool BaseChunk::eof() const {
return _curPos >= _size;
}
uint32 BaseChunk::tell() const {
return _curPos;
}
Chunk::type BaseChunk::getType() const {
return _type;
}
uint32 BaseChunk::getSize() const {
return _size;
}
bool BaseChunk::seek(int32 delta, seek_type dir) {
switch(dir) {
case seek_cur:
_curPos += delta;
break;
case seek_start:
if (delta < 0)
error("invalid seek request");
_curPos = (uint32)delta;
break;
case seek_end:
if (delta > 0 || _size < (uint32)-delta)
error("invalid seek request");
_curPos = (uint32)(_size + delta);
break;
}
if (_curPos > _size) {
error("invalid seek request : %d > %d (delta == %d)", _curPos, _size, delta);
}
return true;
}
FileChunk::FileChunk(const Common::String &name, int offset)
: _name(name) {
if (!g_scumm->openFile(_data, name.c_str()))
error("FileChunk: Unable to open file %s", name.c_str());
_data.seek(offset);
_type = _data.readUint32BE();
_size = _data.readUint32BE();
_offset = _data.pos();
_curPos = 0;
}
FileChunk::~FileChunk() {
}
Chunk *FileChunk::subBlock() {
FileChunk *ptr = new FileChunk(_name, _offset + _curPos);
_data.seek(_offset + _curPos + sizeof(Chunk::type) + sizeof(uint32));
seek(sizeof(Chunk::type) + sizeof(uint32) + ptr->getSize());
return ptr;
}
bool FileChunk::read(void *buffer, uint32 size) {
if (size <= 0 || (_curPos + size) > _size)
error("invalid buffer read request");
// _data.seek(_offset + _curPos);
_data.read(buffer, size);
_curPos += size;
return true;
}
int8 FileChunk::getChar() {
return (int8)getByte();
}
byte FileChunk::getByte() {
// _data.seek(_offset + _curPos);
_curPos++;
if (_curPos > _size)
error("invalid byte read request");
return _data.readByte();
}
int16 FileChunk::getShort() {
return (int16)getWord();
}
uint16 FileChunk::getWord() {
// _data.seek(_offset + _curPos);
_curPos += 2;
if (_curPos > _size)
error("invalid word read request");
return _data.readUint16LE();
}
uint32 FileChunk::getDword() {
// _data.seek(_offset + _curPos);
_curPos += 4;
if (_curPos > _size)
error("invalid dword read request");
return _data.readUint32LE();
}
MemoryChunk::MemoryChunk(byte *data) {
if (data == 0)
error("Chunk() called with NULL pointer");
_type = (Chunk::type)READ_BE_UINT32(data);
_size = READ_BE_UINT32(data + 4);
_data = data + sizeof(Chunk::type) + sizeof(uint32);
_curPos = 0;
}
Chunk *MemoryChunk::subBlock() {
MemoryChunk *ptr = new MemoryChunk(_data + _curPos);
seek(sizeof(Chunk::type) + sizeof(uint32) + ptr->getSize());
return ptr;
}
bool MemoryChunk::read(void *buffer, uint32 size) {
if (size <= 0 || (_curPos + size) > _size)
error("invalid buffer read request");
memcpy(buffer, _data + _curPos, size);
_curPos += size;
return true;
}
int8 MemoryChunk::getChar() {
if (_curPos >= _size)
error("invalid char read request");
return _data[_curPos++];
}
byte MemoryChunk::getByte() {
if (_curPos >= _size)
error("invalid byte read request");
byte *ptr = (byte *)(_data + _curPos);
_curPos += 1;
return *ptr;
}
int16 MemoryChunk::getShort() {
if (_curPos >= _size - 1)
error("invalid int16 read request");
int16 buffer = getWord();
return *((int16 *)&buffer);
}
uint16 MemoryChunk::getWord() {
if (_curPos >= _size - 1)
error("invalid word read request");
uint16 *ptr = (uint16 *)(_data + _curPos);
_curPos += 2;
return READ_LE_UINT16(ptr);
}
uint32 MemoryChunk::getDword() {
if (_curPos >= _size - 3)
error("invalid dword read request");
uint32 *ptr = (uint32 *)(_data + _curPos);
_curPos += 4;
return READ_LE_UINT32(ptr);
}
} // End of namespace Scumm
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