mirror of
https://github.com/libretro/scummvm.git
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162 lines
3.6 KiB
C++
162 lines
3.6 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*
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*/
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#include "common/events.h"
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#include "common/keyboard.h"
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#include "common/file.h"
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#include "common/savefile.h"
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#include "common/config-manager.h"
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#include "base/plugins.h"
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#include "base/version.h"
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#include "sound/mixer.h"
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#include "toltecs/toltecs.h"
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#include "toltecs/resource.h"
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namespace Toltecs {
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/* ArchiveReader */
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ArchiveReader::ArchiveReader() {
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}
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ArchiveReader::~ArchiveReader() {
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}
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void ArchiveReader::openArchive(const char *filename) {
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open(filename);
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for (uint i = 0; i < 10000; i++)
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_offsets[i] = readUint32LE();
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}
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uint32 ArchiveReader::openResource(uint resIndex) {
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uint32 resourceSize = getResourceSize(resIndex);
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seek(_offsets[resIndex]);
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return resourceSize;
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}
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void ArchiveReader::closeResource() {
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}
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uint32 ArchiveReader::getResourceSize(uint resIndex) {
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return _offsets[resIndex + 1] - _offsets[resIndex];
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}
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void ArchiveReader::dump(uint resIndex, const char *prefix) {
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int32 resourceSize = getResourceSize(resIndex);
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byte *data = new byte[resourceSize];
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char fn[256];
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if (prefix)
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snprintf(fn, 256, "%s_%04X.0", prefix, resIndex);
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else
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snprintf(fn, 256, "%04X.0", resIndex);
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openResource(resIndex);
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read(data, resourceSize);
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closeResource();
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FILE *o = fopen(fn, "wb");
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fwrite(data, resourceSize, 1, o);
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fclose(o);
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delete[] data;
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}
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/* ResourceCache */
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ResourceCache::ResourceCache(ToltecsEngine *vm) : _vm(vm) {
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_base = new byte[kMaxCacheSize];
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_bytesUsed = 0;
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memset(_cache, 0, sizeof(_cache));
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_cacheCount = 0;
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_curItemOffset = 0;
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_curItemSize = 0;
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}
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ResourceCache::~ResourceCache() {
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delete[] _base;
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}
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byte *ResourceCache::load(uint resIndex) {
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byte *data = NULL;
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if (existsItem(resIndex)) {
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debug(1, "ResourceCache::load(%d) From cache", resIndex);
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data = _base + _curItemOffset;
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} else {
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debug(1, "ResourceCache::load(%d) From disk", resIndex);
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uint32 size = _vm->_arc->openResource(resIndex);
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data = addItem(resIndex, size);
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_vm->_arc->read(data, size);
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_vm->_arc->closeResource();
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}
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return data;
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}
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bool ResourceCache::existsItem(uint resIndex) {
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for (uint i = 0; i < _cacheCount; i++) {
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if (_cache[i].resIndex == resIndex) {
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_curItemOffset = _cache[i].offset;
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_curItemSize = _cache[i].size;
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return true;
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}
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}
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return false;
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}
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byte *ResourceCache::addItem(uint resIndex, uint32 size) {
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checkCapacity(size);
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_curItemOffset = _bytesUsed;
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_curItemSize = size;
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_cache[_cacheCount].resIndex = resIndex;
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_cache[_cacheCount].offset = _curItemOffset;
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_cache[_cacheCount].size = _curItemSize;
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_cacheCount++;
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_bytesUsed += size;
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return _base + _curItemOffset;
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}
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void ResourceCache::checkCapacity(uint32 size) {
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if (_cacheCount > kMaxCacheItems || _bytesUsed + size > kMaxCacheSize) {
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_cacheCount = 0;
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_bytesUsed = 0;
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}
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}
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} // End of namespace Toltecs
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