mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-16 22:58:09 +00:00
432 lines
11 KiB
C++
432 lines
11 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2003-2005 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 "stdafx.h"
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#include "common/file.h"
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#include "common/util.h"
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#include "common/scummsys.h"
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#include "sky/disk.h"
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#include "sky/rnc_deco.h"
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#include "sky/sky.h"
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#include "sky/struc.h"
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namespace Sky {
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static const char *dataFilename = "sky.dsk";
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static const char *dinnerFilename = "sky.dnr";
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Disk::Disk(const Common::String &gameDataPath) {
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_prefRoot = NULL;
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_dataDiskHandle = new File();
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_dnrHandle = new File();
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uint32 entriesRead;
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_dnrHandle->open(dinnerFilename);
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if (!_dnrHandle->isOpen())
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error("Could not open %s%s", gameDataPath.c_str(), dinnerFilename);
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if (!(_dinnerTableEntries = _dnrHandle->readUint32LE()))
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error("Error reading from sky.dnr"); //even though it was opened correctly?!
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_dinnerTableArea = (uint8 *)malloc(_dinnerTableEntries * 8);
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entriesRead = _dnrHandle->read(_dinnerTableArea, 8 * _dinnerTableEntries) / 8;
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if (entriesRead != _dinnerTableEntries)
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warning("entriesRead != dinnerTableEntries. [%d/%d]", entriesRead, _dinnerTableEntries);
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_dataDiskHandle->open(dataFilename);
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if (!_dataDiskHandle->isOpen())
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error("Error opening %s%s", gameDataPath.c_str(), dataFilename);
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printf("Found BASS version v0.0%d (%d dnr entries)\n", determineGameVersion(), _dinnerTableEntries);
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memset(_buildList, 0, 60 * 2);
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memset(_loadedFilesList, 0, 60 * 4);
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}
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Disk::~Disk(void) {
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PrefFile *fEntry = _prefRoot;
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while (fEntry) {
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free(fEntry->data);
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PrefFile *fTemp = fEntry;
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fEntry = fEntry->next;
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delete fTemp;
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}
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if (_dnrHandle->isOpen())
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_dnrHandle->close();
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if (_dataDiskHandle->isOpen())
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_dataDiskHandle->close();
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delete _dnrHandle;
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delete _dataDiskHandle;
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}
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void Disk::flushPrefetched(void) {
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PrefFile *fEntry = _prefRoot;
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while (fEntry) {
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free(fEntry->data);
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PrefFile *fTemp = fEntry;
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fEntry = fEntry->next;
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delete fTemp;
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}
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_prefRoot = NULL;
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}
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bool Disk::fileExists(uint16 fileNr) {
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return (getFileInfo(fileNr) != NULL);
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}
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// allocate memory, load the file and return a pointer
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uint8 *Disk::loadFile(uint16 fileNr) {
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uint8 cflag;
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uint8 *prefData = givePrefetched(fileNr, &_lastLoadedFileSize);
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if (prefData)
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return prefData;
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debug(2, "load file %d,%d (%d)", (fileNr >> 11), (fileNr & 2047), fileNr);
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uint8 *fileInfoPtr = getFileInfo(fileNr);
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if (fileInfoPtr == NULL) {
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debug(1, "File %d not found", fileNr);
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return NULL;
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}
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uint32 fileFlags = READ_LE_UINT24(fileInfoPtr + 5);
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uint32 fileSize = fileFlags & 0x03fffff;
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uint32 fileOffset = READ_LE_UINT32(fileInfoPtr + 2) & 0x0ffffff;
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_lastLoadedFileSize = fileSize;
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cflag = (uint8)((fileOffset >> 23) & 0x1);
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fileOffset &= 0x7FFFFF;
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if (cflag) {
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if (SkyEngine::_systemVars.gameVersion == 331)
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fileOffset <<= 3;
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else
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fileOffset <<= 4;
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}
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uint8 *fileDest = (uint8 *)malloc(fileSize + 4); // allocate memory for file
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_dataDiskHandle->seek(fileOffset, SEEK_SET);
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//now read in the data
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int32 bytesRead = _dataDiskHandle->read(fileDest, fileSize);
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if (bytesRead != (int32)fileSize)
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warning("Unable to read %d bytes from datadisk (%d bytes read)", fileSize, bytesRead);
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cflag = (uint8)((fileFlags >> 23) & 0x1);
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//if cflag == 0 then file is compressed, 1 == uncompressed
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dataFileHeader *fileHeader = (dataFileHeader*)fileDest;
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if ((!cflag) && ((FROM_LE_16(fileHeader->flag) >> 7) & 1)) {
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debug(2, "File is RNC compressed.");
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uint32 decompSize = (FROM_LE_16(fileHeader->flag) & ~0xFF) << 8;
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decompSize |= FROM_LE_16(fileHeader->s_tot_size);
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uint8 *uncompDest = (uint8 *)malloc(decompSize);
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RncDecoder rncDecoder;
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int32 unpackLen;
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if ((fileFlags >> 22) & 0x1) { //do we include the header?
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// don't return the file's header
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unpackLen = rncDecoder.unpackM1(fileDest + sizeof(dataFileHeader), uncompDest, 0);
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} else {
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#ifdef SCUMM_BIG_ENDIAN
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// Convert dataFileHeader to BE (it only consists of 16 bit words)
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uint16 *headPtr = (uint16 *)fileDest;
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for (uint i = 0; i < sizeof(struct dataFileHeader) / 2; i++)
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*(headPtr + i) = READ_LE_UINT16(headPtr + i);
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#endif
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memcpy(uncompDest, fileDest, sizeof(dataFileHeader));
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unpackLen = rncDecoder.unpackM1(fileDest + sizeof(dataFileHeader), uncompDest + sizeof(dataFileHeader), 0);
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if (unpackLen)
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unpackLen += sizeof(dataFileHeader);
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}
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debug(3, "UnpackM1 returned: %d", unpackLen);
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if (unpackLen == 0) { //Unpack returned 0: file was probably not packed.
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free(uncompDest);
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return fileDest;
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} else {
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if (unpackLen != (int32)decompSize)
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debug(1, "ERROR: File %d: invalid decomp size! (was: %d, should be: %d)", fileNr, unpackLen, decompSize);
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_lastLoadedFileSize = decompSize;
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free(fileDest);
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return uncompDest;
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}
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} else {
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#ifdef SCUMM_BIG_ENDIAN
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if (!cflag) {
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uint16 *headPtr = (uint16 *)fileDest;
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for (uint i = 0; i < sizeof(struct dataFileHeader) / 2; i++)
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*(headPtr + i) = READ_LE_UINT16(headPtr + i);
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}
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#endif
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return fileDest;
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}
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}
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void Disk::prefetchFile(uint16 fileNr) {
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PrefFile **fEntry = &_prefRoot;
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bool found = false;
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while (*fEntry) {
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if ((*fEntry)->fileNr == fileNr)
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found = true;
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fEntry = &((*fEntry)->next);
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}
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if (found) {
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debug(1,"Disk::prefetchFile: File %d was already prefetched",fileNr);
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return ;
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}
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uint8 *temp = loadFile(fileNr);
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*fEntry = new PrefFile;
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(*fEntry)->data = temp;
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(*fEntry)->fileSize = _lastLoadedFileSize;
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(*fEntry)->fileNr = fileNr;
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(*fEntry)->next = NULL;
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}
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uint8 *Disk::givePrefetched(uint16 fileNr, uint32 *fSize) {
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PrefFile **fEntry = &_prefRoot;
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bool found = false;
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while ((*fEntry) && (!found)) {
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if ((*fEntry)->fileNr == fileNr)
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found = true;
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else
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fEntry = &((*fEntry)->next);
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}
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if (!found) {
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*fSize = 0;
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return NULL;
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}
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uint8 *retPtr = (*fEntry)->data;
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PrefFile *retStr = *fEntry;
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*fEntry = (*fEntry)->next;
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*fSize = retStr->fileSize;
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delete retStr;
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return retPtr;
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}
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uint8 *Disk::getFileInfo(uint16 fileNr) {
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uint16 i;
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uint16 *dnrTbl16Ptr = (uint16 *)_dinnerTableArea;
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for (i = 0; i < _dinnerTableEntries; i++) {
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if (READ_LE_UINT16(dnrTbl16Ptr) == fileNr) {
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debug(2, "file %d found!", fileNr);
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return (uint8 *)dnrTbl16Ptr;
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}
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dnrTbl16Ptr += 4;
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}
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return 0; //not found
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}
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void Disk::fnCacheChip(uint16 *fList) {
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// fnCacheChip is called after fnCacheFast
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uint16 cnt = 0;
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while (_buildList[cnt])
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cnt++;
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uint16 fCnt = 0;
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do {
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_buildList[cnt + fCnt] = fList[fCnt] & 0x7FFFU;
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fCnt++;
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} while (fList[fCnt-1]);
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fnCacheFiles();
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}
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void Disk::fnCacheFast(uint16 *fList) {
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if (fList != NULL) {
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uint8 cnt = 0;
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do {
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_buildList[cnt] = fList[cnt] & 0x7FFFU;
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cnt++;
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} while (fList[cnt-1]);
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}
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}
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void Disk::fnCacheFiles(void) {
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uint16 lCnt, bCnt, targCnt;
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targCnt = lCnt = 0;
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bool found;
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while (_loadedFilesList[lCnt]) {
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bCnt = 0;
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found = false;
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while (_buildList[bCnt] && (!found)) {
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if ((_buildList[bCnt] & 0x7FFFU) == _loadedFilesList[lCnt])
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found = true;
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else
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bCnt++;
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}
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if (found) {
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_loadedFilesList[targCnt] = _loadedFilesList[lCnt];
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targCnt++;
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} else {
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free(SkyEngine::_itemList[_loadedFilesList[lCnt] & 2047]);
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SkyEngine::_itemList[_loadedFilesList[lCnt] & 2047] = NULL;
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}
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lCnt++;
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}
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_loadedFilesList[targCnt] = 0; // mark end of list
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bCnt = 0;
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while (_buildList[bCnt]) {
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if ((_buildList[bCnt] & 0x7FF) == 0x7FF) {
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// amiga dummy files
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bCnt++;
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continue;
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}
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lCnt = 0;
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found = false;
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while (_loadedFilesList[lCnt] && (!found)) {
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if (_loadedFilesList[lCnt] == (_buildList[bCnt] & 0x7FFFU))
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found = true;
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lCnt++;
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}
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if (found) {
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bCnt++;
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continue;
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}
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// ok, we really have to load the file.
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_loadedFilesList[targCnt] = _buildList[bCnt] & 0x7FFFU;
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targCnt++;
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_loadedFilesList[targCnt] = 0;
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SkyEngine::_itemList[_buildList[bCnt] & 2047] = (void**)loadFile(_buildList[bCnt] & 0x7FFF);
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if (!SkyEngine::_itemList[_buildList[bCnt] & 2047])
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warning("fnCacheFiles: Disk::loadFile() returned NULL for file %d",_buildList[bCnt] & 0x7FFF);
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bCnt++;
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}
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_buildList[0] = 0;
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}
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void Disk::refreshFilesList(uint32 *list) {
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uint8 cnt = 0;
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while (_loadedFilesList[cnt]) {
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if (SkyEngine::_itemList[_loadedFilesList[cnt] & 2047])
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free(SkyEngine::_itemList[_loadedFilesList[cnt] & 2047]);
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SkyEngine::_itemList[_loadedFilesList[cnt] & 2047] = NULL;
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cnt++;
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}
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cnt = 0;
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while (list[cnt]) {
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_loadedFilesList[cnt] = list[cnt];
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SkyEngine::_itemList[_loadedFilesList[cnt] & 2047] = (void**)loadFile((uint16)(_loadedFilesList[cnt] & 0x7FFF));
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cnt++;
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}
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_loadedFilesList[cnt] = 0;
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}
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void Disk::fnMiniLoad(uint16 fileNum) {
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uint16 cnt = 0;
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while (_loadedFilesList[cnt]) {
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if (_loadedFilesList[cnt] == fileNum)
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return ;
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cnt++;
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}
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_loadedFilesList[cnt] = fileNum & 0x7FFFU;
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_loadedFilesList[cnt + 1] = 0;
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SkyEngine::_itemList[fileNum & 2047] = (void**)loadFile(fileNum);
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}
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void Disk::fnFlushBuffers(void) {
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// dump all loaded sprites
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uint8 lCnt = 0;
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while (_loadedFilesList[lCnt]) {
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free(SkyEngine::_itemList[_loadedFilesList[lCnt] & 2047]);
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SkyEngine::_itemList[_loadedFilesList[lCnt] & 2047] = 0;
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lCnt++;
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}
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_loadedFilesList[0] = 0;
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}
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void Disk::dumpFile(uint16 fileNr) {
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char buf[128];
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File out;
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byte* filePtr;
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filePtr = loadFile(fileNr);
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sprintf(buf, "dumps/file-%d.dmp", fileNr);
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if (!out.exists(buf, "")) {
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if (out.open(buf, File::kFileWriteMode, ""))
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out.write(filePtr, _lastLoadedFileSize);
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}
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free(filePtr);
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}
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uint32 Disk::determineGameVersion() {
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//determine game version based on number of entries in dinner table
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switch (_dinnerTableEntries) {
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case 243:
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// pc gamer demo (v0.0109)
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return 109;
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case 247:
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//floppy demo (v0.0267)
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return 267;
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case 1404:
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//floppy (v0.0288)
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return 288;
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case 1413:
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//floppy (v0.0303)
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return 303;
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case 1445:
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//floppy (v0.0331 or v0.0348)
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if (_dataDiskHandle->size() == 8830435)
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return 348;
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else
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return 331;
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case 1711:
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//cd demo (v0.0365)
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return 365;
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case 5099:
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//cd (v0.0368)
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return 368;
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case 5097:
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//cd (v0.0372)
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return 372;
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default:
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//unknown version
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error("Unknown game version! %d dinner table entries", _dinnerTableEntries);
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break;
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}
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}
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} // End of namespace Sky
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