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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/file.h"
#include "saga.h"
#include "resfile.h"
#include "binread.h"
namespace Saga {
ResourceFile::ResourceFile() {
_resTblOffset = 0;
_resTblCt = 0;
_resTblLoaded = false;
_resTbl = NULL;
}
ResourceFile::~ResourceFile() {
close();
}
bool ResourceFile::open(const char *filename, const char *directory) {
byte * temp_tbl;
uint32 tbl_len;
if (!File::open(filename, directory)) {
return false;
}
/* Seek to end of file to read resource table 'trailer' */
_file_len = size();
seek(_file_len - RSC_TABLEINFO_SIZE, SEEK_SET);
_resTblOffset = readSint32LE();
_resTblCt = readSint32LE();
/* Check for sane values */
if (_resTblOffset != _file_len - RSC_TABLEINFO_SIZE -
(RSC_TABLEENTRY_SIZE * _resTblCt)) {
return false;
}
/* Load resource table */
_resTbl = new Resource[_resTblCt];
seek(_resTblOffset, SEEK_SET);
tbl_len = _resTblCt * RSC_TABLEENTRY_SIZE;
temp_tbl = new byte[tbl_len];
if (read(temp_tbl, tbl_len) != tbl_len) {
delete [] _resTbl;
delete [] temp_tbl;
return false;
}
BinReader bread(temp_tbl, tbl_len);
for (int i = 0; i < _resTblCt; i++) {
_resTbl[i].res_offset = bread.readSint32LE();
_resTbl[i].res_len = bread.readSint32LE();
}
delete[] temp_tbl;
_resTblLoaded = true;
return true;
}
void ResourceFile::close() {
if ( _resTblLoaded) {
delete [] _resTbl;
_resTblLoaded = false;
_resTbl = NULL;
}
_resTblOffset = 0;
_resTblCt = 0;
if (File::isOpen()) {
File::close();
}
}
int32 ResourceFile::getResourceCt() {
return (_resTblLoaded) ? _resTblCt : -1;
}
int32 ResourceFile::getResourceOffset(int32 rn) {
if (!R_PBOUNDS(rn, _resTblCt))
return -1;
return _resTbl[rn].res_offset;
}
int32 ResourceFile::getResourceLen(int32 rn) {
if (!R_PBOUNDS(rn, _resTblCt))
return -1;
return _resTbl[rn].res_len;
}
bool ResourceFile::loadResource(int32 rn, byte **res, int32 *res_len) {
byte *new_res;
uint32 new_res_len;
assert(res != NULL && res_len != NULL);
*res = NULL;
*res_len = NULL;
if (!R_PBOUNDS(rn, _resTblCt)) {
return false;
}
new_res_len = _resTbl[rn].res_len;
new_res = new byte[new_res_len];
if (!new_res) {
return false;
}
seek(_resTbl[rn].res_offset, SEEK_SET);
if (read(new_res, new_res_len) != new_res_len) {
delete[] new_res;
return false;
}
*res = new_res;
*res_len = new_res_len;
return true;
}
void ResourceFile::freeResource(byte *res) {
delete[] res;
}
}
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