mirror of
https://github.com/libretro/scummvm.git
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183 lines
3.2 KiB
C++
183 lines
3.2 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2003 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#include "common/file.h"
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#include "saga.h"
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#include "resfile.h"
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#include "binread.h"
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ResourceFile::ResourceFile() {
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_resTblOffset = 0;
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_resTblCt = 0;
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_resTblLoaded = false;
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_resTbl = NULL;
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}
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ResourceFile::~ResourceFile() {
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close();
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}
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bool
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ResourceFile::open( const char *filename, const char *directory ) {
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byte * temp_tbl;
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uint32 tbl_len;
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if( !File::open( filename, directory )) {
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return false;
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}
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/* Seek to end of file to read resource table 'trailer' */
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_file_len = size();
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seek( _file_len - RSC_TABLEINFO_SIZE, SEEK_SET );
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_resTblOffset = readSint32LE();
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_resTblCt = readSint32LE();
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/* Check for sane values */
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if( _resTblOffset != _file_len - RSC_TABLEINFO_SIZE -
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(RSC_TABLEENTRY_SIZE * _resTblCt)) {
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return false;
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}
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/* Load resource table */
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_resTbl = new Resource[_resTblCt];
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seek( _resTblOffset, SEEK_SET );
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tbl_len = _resTblCt * RSC_TABLEENTRY_SIZE;
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temp_tbl = new byte[tbl_len];
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if( read( temp_tbl, tbl_len ) != tbl_len ) {
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delete [] _resTbl;
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delete [] temp_tbl;
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return false;
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}
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BinReader bread( temp_tbl, tbl_len );
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for( int i = 0 ; i < _resTblCt ; i++ ) {
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_resTbl[i].res_offset = bread.readSint32LE();
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_resTbl[i].res_len = bread.readSint32LE();
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}
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delete [] temp_tbl;
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_resTblLoaded = true;
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return true;
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}
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void ResourceFile::close() {
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if( _resTblLoaded ) {
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delete [] _resTbl;
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_resTblLoaded = false;
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_resTbl = NULL;
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}
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_resTblOffset = 0;
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_resTblCt = 0;
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if( File::isOpen() ) {
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File::close();
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}
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}
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int32 ResourceFile::getResourceCt() {
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return (_resTblLoaded) ? _resTblCt : -1;
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}
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int32 ResourceFile::getResourceOffset( int32 rn ) {
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if (!R_PBOUNDS( rn, _resTblCt )) {
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return -1;
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}
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return _resTbl[rn].res_offset;
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}
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int32 ResourceFile::getResourceLen( int32 rn ) {
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if (!R_PBOUNDS( rn, _resTblCt )) {
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return -1;
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}
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return _resTbl[rn].res_len;
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}
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bool ResourceFile::loadResource( int32 rn, byte **res, int32 *res_len ) {
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byte *new_res;
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uint32 new_res_len;
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assert( res != NULL && res_len != NULL );
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*res = NULL;
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*res_len = NULL;
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if( !R_PBOUNDS( rn, _resTblCt )) {
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return false;
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}
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new_res_len = _resTbl[rn].res_len;
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new_res = new byte[ new_res_len ];
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if( !new_res ) {
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return false;
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}
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seek( _resTbl[rn].res_offset, SEEK_SET );
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if( read( new_res, new_res_len ) != new_res_len ) {
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delete [] new_res;
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return false;
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}
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*res = new_res;
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*res_len = new_res_len;
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return true;
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}
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void ResourceFile::freeResource( byte *res ) {
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delete [] res;
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}
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