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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 "common/file.h"
#include "sky/skydefs.h"
#include "sky/sky.h"
#include "sky/rnc_deco.h"
#define MAX_FILES_IN_LIST 60
const char *dataFilename = "sky.dsk";
const char *dinnerFilename = "sky.dnr";
uint8 *dinnerTableArea, *fixedDest, *fileDest, *compDest;
uint32 dinnerTableEntries, fileFlags, fileOffset, fileSize, decompSize, compFile;
uint16 buildList[MAX_FILES_IN_LIST];
uint32 loadedFileList[MAX_FILES_IN_LIST];
File *dataDiskHandle = new File();
File *dnrHandle = new File();
void SkyState::initialiseDisk() {
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);
determineGameVersion(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 *SkyState::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 *SkyState::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 SkyState::determineGameVersion(uint32 dnrEntries) {
//determine game version based on number of entries in dinner table
switch (dnrEntries) {
case 247:
//floppy demo (v0.0267)
_isDemo = true;
_isCDVersion = false;
_gameVersion = 267;
break;
case 1404:
//floppy (v0.0288)
_isDemo = false;
_isCDVersion = false;
_gameVersion = 288;
break;
case 1445:
//floppy (v0.0331)
_isDemo = false;
_isCDVersion = false;
_gameVersion = 331;
break;
case 1711:
//cd demo (v0.0365)
_isDemo = true;
_isCDVersion = true;
_gameVersion = 365;
break;
case 5099:
//cd (v0.0368)
_isDemo = false;
_isCDVersion = true;
_gameVersion = 368;
break;
default:
//unknown version
error("Unknown game version!");
break;
}
}
void SkyState::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);
}
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