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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 "stdafx.h"
#include "common/scummsys.h"
#include "common/engine.h"
#include "sky/disk.h"
#include "sky/skydefs.h"
#include "sky/sky.h"
#include "sky/rnc_deco.h"
static const char *dataFilename = "sky.dsk";
static const char *dinnerFilename = "sky.dnr";
SkyDisk::SkyDisk(char *gameDataPath) {
_gameDataPath = gameDataPath;
_dataDiskHandle = new File();
_dnrHandle = new File();
uint32 entriesRead;
_dnrHandle->open(dinnerFilename, _gameDataPath);
if (_dnrHandle->isOpen() == false)
error("Could not open %s%s!\n", _gameDataPath, dinnerFilename);
if (!(_dinnerTableEntries = _dnrHandle->readUint32LE()))
error("Error reading from sky.dnr!\n"); //even though it was opened correctly?!
debug(1, "Entries in dinner table: %d", _dinnerTableEntries);
_dinnerTableArea = (uint8 *)malloc(_dinnerTableEntries * 8);
entriesRead = _dnrHandle->read(_dinnerTableArea, 8 * _dinnerTableEntries) / 8;
if (entriesRead != _dinnerTableEntries)
warning("entriesRead != dinnerTableEntries. [%d/%d]\n", entriesRead, _dinnerTableEntries);
_dataDiskHandle->open(dataFilename, _gameDataPath);
if (_dataDiskHandle->isOpen() == false)
error("Error opening %s%s!\n", _gameDataPath, dataFilename);
}
//load in file file_nr to address dest
//if dest == NULL, then allocate memory for this file
uint8 *SkyDisk::loadFile(uint16 fileNr, uint8 *dest) {
uint8 cflag;
int32 bytesRead;
uint8 *filePtr, *inputPtr, *outputPtr;
dataFileHeader fileHeader;
#ifdef file_order_chk
warning("File order checking not implemented yet!\n");
#endif
_compFile = fileNr;
debug(2, "load file %d,%d (%d)", (fileNr >> 11), (fileNr & 2047), fileNr);
filePtr = getFileInfo(fileNr);
if (filePtr == NULL) {
printf("File %d not found!\n", fileNr);
return NULL;
}
_fileFlags = READ_LE_UINT32((filePtr + 5));
_fileSize = _fileFlags & 0x03fffff;
_lastLoadedFileSize = _fileSize;
_fileOffset = READ_LE_UINT32((filePtr + 2)) & 0x0ffffff;
cflag = (uint8)((_fileOffset >> (23)) & 0x1);
_fileOffset = (((1 << (23)) ^ 0xFFFFFFFF) & _fileOffset);
if (cflag)
_fileOffset <<= 4;
_fixedDest = dest;
_fileDest = dest;
_compDest = dest;
if (dest == NULL) //we need to allocate memory for this file
_fileDest = (uint8 *)malloc(_fileSize);
_dataDiskHandle->seek(_fileOffset, SEEK_SET);
#ifdef file_order_chk
warning("File order checking not implemented yet!\n");
#endif
//now read in the data
bytesRead = _dataDiskHandle->read(_fileDest, 1 * _fileSize);
if (bytesRead != (int32)_fileSize)
printf("ERROR: Unable to read %d bytes from datadisk (%d bytes read)\n", _fileSize, bytesRead);
cflag = (uint8)((_fileFlags >> (23)) & 0x1);
//if cflag == 0 then file is compressed, 1 == uncompressed
if (!cflag) {
debug(2, "File is compressed...");
memcpy(&fileHeader, _fileDest, sizeof(struct dataFileHeader));
if ( (uint8)((FROM_LE_16(fileHeader.flag) >> 7) & 0x1) ) {
debug(2, "with RNC!");
_decompSize = (FROM_LE_16(fileHeader.flag) & 0xFFFFFF00) << 8;
_decompSize |= FROM_LE_16((uint16)fileHeader.s_tot_size);
if (_fixedDest == NULL) // is this valid?
_compDest = (uint8 *)malloc(_decompSize);
inputPtr = _fileDest;
outputPtr = _compDest;
if ( (uint8)(_fileFlags >> (22) & 0x1) ) //do we include the header?
inputPtr += sizeof(struct dataFileHeader);
else {
memcpy(outputPtr, inputPtr, sizeof(struct dataFileHeader));
inputPtr += sizeof(struct dataFileHeader);
outputPtr += sizeof(struct dataFileHeader);
}
RncDecoder rncDecoder;
int32 unPackLen = rncDecoder.unpackM1(inputPtr, outputPtr, 0);
debug(3, "UnpackM1 returned: %d", unPackLen);
if (unPackLen == 0) { //Unpack returned 0: file was probably not packed.
if (_fixedDest == NULL)
free(_compDest);
return _fileDest;
}
if (! (uint8)(_fileFlags >> (22) & 0x1) ) { // include header?
unPackLen += sizeof(struct dataFileHeader);
if (unPackLen != (int32)_decompSize) {
debug(1, "ERROR: invalid decomp size! (was: %d, should be: %d)", unPackLen, _decompSize);
}
}
_lastLoadedFileSize = _decompSize; //including header
if (_fixedDest == NULL)
free(_fileDest);
} else
debug(2, "but not with RNC! (?!)");
} else
return _fileDest;
return _compDest;
}
uint8 *SkyDisk::getFileInfo(uint16 fileNr) {
uint16 i;
uint16 *dnrTbl16Ptr = (uint16 *)_dinnerTableArea;
for (i = 0; i < _dinnerTableEntries; i++) {
if (READ_LE_UINT16(dnrTbl16Ptr + (i * 4)) == fileNr) {
debug(2, "file %d found!", fileNr);
return (uint8 *)(dnrTbl16Ptr + (i * 4));
}
}
// if file not found return NULL
return (uint8 *)NULL;
}
void SkyDisk::dumpFile(uint16 fileNr) {
char buf[128];
File out;
byte* filePtr;
filePtr = loadFile(fileNr, NULL);
sprintf(buf, "dumps/file-%d.dmp", fileNr);
out.open(buf, "", 1);
if (out.isOpen() == false) {
out.open(buf, "", 2);
if (out.isOpen() == false)
return;
out.write(filePtr, _lastLoadedFileSize);
}
out.close();
free(filePtr);
}
uint32 SkyDisk::determineGameVersion() {
//determine game version based on number of entries in dinner table
switch (_dinnerTableEntries) {
case 247:
//floppy demo (v0.0267)
return 267;
case 1404:
//floppy (v0.0288)
return 288;
case 1413:
//floppy (v0.0303)
return 303;
case 1445:
//floppy (v0.0331)
return 331;
case 1711:
//cd demo (v0.0365)
return 365;
case 5099:
//cd (v0.0368)
return 368;
case 5097:
//cd (v0.0372)
return 372;
default:
//unknown version
error("Unknown game version!");
break;
}
}
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