mirror of
https://github.com/libretro/scummvm.git
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163 lines
3.2 KiB
C++
163 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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namespace Saga {
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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 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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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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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 = 0;
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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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} // End of namespace Saga
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