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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 "queen/queen.h"
#include "queen/resource.h"
#define DEMO_JAS_VERSION_OFFSET 0x119A8
#define JAS_VERSION_OFFSET 0x12484
static const char *dataFilename = "queen.1";
QueenResource::QueenResource(char *datafilePath) {
_datafilePath = datafilePath;
_resourceFile = new File();
_resourceFile->open(dataFilename, _datafilePath);
if (_resourceFile->isOpen() == false)
error("Could not open resource file '%s%s'", _datafilePath, dataFilename);
//detect game version based on resource file size.
//we try to verify that it is indeed the version we think it is later on
switch(_resourceFile->size()) {
case 3724538:
_gameVersion = &_gameVersionPE100v1;
break;
case 3732177:
_gameVersion = &_gameVersionPE100v2;
break;
case 22677657:
_gameVersion = &_gameVersionPEM10;
break;
case 190787021:
_gameVersion = &_gameVersionCEM10;
break;
default:
error("Unknown/unsupported FOTAQ version");
}
debug(5, "Detected game version: %s, which has %d resource entries", _gameVersion->versionString, _gameVersion->resourceEntries);
if (strcmp(_gameVersion->versionString, JASVersion()))
error("Verifying game version failed! (expected: '%s', found: '%s')", _gameVersion->versionString, JASVersion());
}
QueenResource::~QueenResource() {
_resourceFile->close();
}
int32 QueenResource::resourceIndex(const char *filename) {
char entryName[14];
char *ptr = entryName;
assert(strlen(filename));
strcpy(entryName, filename);
do
*ptr = toupper(*ptr);
while (*ptr++);
uint32 low = 0;
uint32 high = _gameVersion->resourceEntries - 1;
if (!strcmp(entryName, _gameVersion->resourceTable[low].filename))
return low;
if (!strcmp(entryName, _gameVersion->resourceTable[high].filename))
return high;
//Use simple binary search to locate file
for(;;) {
uint32 cur = (low + high) / 2;
int32 diff = strcmp(entryName, _gameVersion->resourceTable[cur].filename);
if (!diff)
return cur;
if ((cur == low) || (cur == high))
break;
if (diff > 0)
low = cur;
else
high = cur;
}
error("Couldn't find file '%s'", entryName);
return -1;
}
uint32 QueenResource::fileSize(const char *filename) {
return _gameVersion->resourceTable[resourceIndex(filename)].size;
}
uint32 QueenResource::fileOffset(const char *filename) {
return _gameVersion->resourceTable[resourceIndex(filename)].offset;
}
uint8 *QueenResource::loadFile(const char *filename, uint32 skipBytes) {
uint32 size = fileSize(filename);
byte *mem = new byte[size];
// skip 'skipBytes' bytes (useful for headers)
_resourceFile->seek(fileOffset(filename) + skipBytes, SEEK_SET);
_resourceFile->read(mem, size - skipBytes);
return mem;
}
bool QueenResource::exists(const char *filename) {
return resourceIndex(filename) >= 0;
}
const char *QueenResource::JASVersion() {
static char versionStr[6];
if (_gameVersion->isDemo)
_resourceFile->seek(fileOffset("QUEEN.JAS") + DEMO_JAS_VERSION_OFFSET, SEEK_SET );
else
_resourceFile->seek(fileOffset("QUEEN.JAS") + JAS_VERSION_OFFSET, SEEK_SET);
_resourceFile->read(versionStr, 6);
return versionStr;
}
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