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/* ScummVM - Scumm Interpreter
* Copyright (C) 2002-2003 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/util.h"
#include "common/savefile.h"
// FIXME HACK
// Enable this to activate transparent zlib compression of all savegames
// Note that doing that makes ScummVM produce savegames which can't trivially
// be read by non-zlib enabled versions. However, one can always decompress
// such a savegame by using gzip, so this shouldn't be a bad problem.
//#define USE_ZLIB
#ifdef USE_ZLIB
#include <zlib.h>
#endif
uint32 SaveFile::read(void *ptr, uint32 size) {
return fread(ptr, 1, size);
}
byte SaveFile::readByte() {
byte b;
// TODO: Proper error handling
if (fread(&b, 1, 1) != 1)
return 0;
return b;
}
uint16 SaveFile::readUint16LE() {
uint16 a = readByte();
uint16 b = readByte();
return a | (b << 8);
}
uint32 SaveFile::readUint32LE() {
uint32 a = readUint16LE();
uint32 b = readUint16LE();
return (b << 16) | a;
}
uint16 SaveFile::readUint16BE() {
uint16 b = readByte();
uint16 a = readByte();
return a | (b << 8);
}
uint32 SaveFile::readUint32BE() {
uint32 b = readUint16BE();
uint32 a = readUint16BE();
return (b << 16) | a;
}
uint32 SaveFile::write(const void *ptr, uint32 size) {
return fwrite(ptr, 1, size);
}
void SaveFile::writeByte(byte value) {
fwrite(&value, 1, 1);
}
void SaveFile::writeUint16LE(uint16 value) {
writeByte((byte)(value & 0xff));
writeByte((byte)(value >> 8));
}
void SaveFile::writeUint32LE(uint32 value) {
writeUint16LE((uint16)(value & 0xffff));
writeUint16LE((uint16)(value >> 16));
}
void SaveFile::writeUint16BE(uint16 value) {
writeByte((byte)(value >> 8));
writeByte((byte)(value & 0xff));
}
void SaveFile::writeUint32BE(uint32 value) {
writeUint16BE((uint16)(value >> 16));
writeUint16BE((uint16)(value & 0xffff));
}
class StdioSaveFile : public SaveFile {
private:
FILE *fh;
public:
StdioSaveFile(const char *filename, bool saveOrLoad)
{ fh = ::fopen(filename, (saveOrLoad? "wb" : "rb")); }
~StdioSaveFile()
{ if(fh) ::fclose(fh); }
bool isOpen() const { return fh != 0; }
protected:
int fread(void *buf, int size, int cnt)
{ return ::fread(buf, size, cnt, fh); }
int fwrite(const void *buf, int size, int cnt)
{ return ::fwrite(buf, size, cnt, fh); }
};
#ifdef USE_ZLIB
class GzipSaveFile : public SaveFile {
private:
gzFile fh;
public:
GzipSaveFile(const char *filename, bool saveOrLoad)
{ fh = ::gzopen(filename, (saveOrLoad? "wb" : "rb")); }
~GzipSaveFile()
{ if(fh) ::gzclose(fh); }
bool isOpen() const { return fh != 0; }
protected:
int fread(void *buf, int size, int cnt) {
return ::gzread(fh, buf, size * cnt);
}
int fwrite(const void *buf, int size, int cnt) {
// Due to a "bug" in the zlib headers (or maybe I should say,
// a bug in the C++ spec? Whatever <g>) we have to be a bit
// hackish here and remove the const qualifier.
// Note that gzwrite's buf param is declared as "const voidp"
// which you might think is the same as "const void *" but it
// is not - rather it is equal to "void const *" which is the
// same as "void *". Hrmpf
return ::gzwrite(fh, const_cast<void *>(buf), size * cnt);
}
};
#endif
SaveFile *SaveFileManager::open_savefile(const char *filename, const char *directory, bool saveOrLoad) {
char buf[256];
join_paths(filename, directory, buf, sizeof(buf));
SaveFile *sf = makeSaveFile(buf, saveOrLoad);
if (!sf->isOpen()) {
delete sf;
sf = 0;
}
return sf;
}
void SaveFileManager::join_paths(const char *filename, const char *directory,
char *buf, int bufsize) {
buf[bufsize-1] = '\0';
strncpy(buf, directory, bufsize-1);
#ifdef WIN32
// Fix for Win98 issue related with game directory pointing to root drive ex. "c:\"
if ((buf[0] != 0) && (buf[1] == ':') && (buf[2] == '\\') && (buf[3] == 0)) {
buf[2] = 0;
}
#endif
const int dirLen = strlen(buf);
if (dirLen > 0) {
#ifdef __MORPHOS__
if (buf[dirLen-1] != ':' && buf[dirLen-1] != '/')
#endif
#if !defined(__GP32__) && !defined(__PALM_OS__)
strncat(buf, "/", bufsize-1); // prevent double /
#endif
}
strncat(buf, filename, bufsize-1);
}
SaveFile *SaveFileManager::makeSaveFile(const char *filename, bool saveOrLoad) {
#ifdef USE_ZLIB
return new GzipSaveFile(filename, saveOrLoad);
#else
return new StdioSaveFile(filename, saveOrLoad);
#endif
}
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