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savefile.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/common/savefile.cpp $
 * $Id: savefile.cpp 22181 2006-04-26 13:12:33Z eriktorbjorn $
 *
 */

#include "common/stdafx.h"
#include "common/util.h"
#include "common/config-manager.h"
#include "common/savefile.h"

#include <stdio.h>
#include <string.h>

#ifdef USE_ZLIB
#include <zlib.h>
#endif

namespace Common {

const char *SaveFileManager::getSavePath() const {

#if defined(PALMOS_MODE) || defined(__PSP__)
      return SCUMMVM_SAVEPATH;
#else

      const char *dir = NULL;

      // Try to use game specific savepath from config
      dir = ConfMan.get("savepath").c_str();

      // Work around a bug (#999122) in the original 0.6.1 release of
      // ScummVM, which would insert a bad savepath value into config files.
      if (0 == strcmp(dir, "None")) {
            ConfMan.removeKey("savepath", ConfMan.getActiveDomainName());
            ConfMan.flushToDisk();
            dir = ConfMan.get("savepath").c_str();
      }

#ifdef _WIN32_WCE
      if (dir[0] == 0)
            dir = ConfMan.get("path").c_str();
#endif

      assert(dir);

      return dir;
#endif
}

class StdioSaveFile : public InSaveFile, public OutSaveFile {
private:
      FILE *fh;
public:
      StdioSaveFile(const char *filename, bool saveOrLoad) {
            fh = ::fopen(filename, (saveOrLoad? "wb" : "rb"));
      }
      ~StdioSaveFile() {
            if (fh)
                  ::fclose(fh);
      }

      bool eos() const { return feof(fh) != 0; }
      bool ioFailed() const { return ferror(fh) != 0; }
      void clearIOFailed() { clearerr(fh); }

      bool isOpen() const { return fh != 0; }

      uint32 read(void *dataPtr, uint32 dataSize) {
            assert(fh);
            return fread(dataPtr, 1, dataSize, fh);
      }
      uint32 write(const void *dataPtr, uint32 dataSize) {
            assert(fh);
            return fwrite(dataPtr, 1, dataSize, fh);
      }

      uint32 pos() const {
            assert(fh);
            return ftell(fh);
      }
      uint32 size() const {
            assert(fh);
            uint32 oldPos = ftell(fh);
            fseek(fh, 0, SEEK_END);
            uint32 length = ftell(fh);
            fseek(fh, oldPos, SEEK_SET);
            return length;
      }

      void seek(int32 offs, int whence = SEEK_SET) {
            assert(fh);
            fseek(fh, offs, whence);
      }
};


#ifdef USE_ZLIB
class GzipSaveFile : public InSaveFile, public OutSaveFile {
private:
      gzFile fh;
      bool _ioError;
public:
      GzipSaveFile(const char *filename, bool saveOrLoad) {
            _ioError = false;
            fh = gzopen(filename, (saveOrLoad? "wb" : "rb"));
      }
      ~GzipSaveFile() {
            if (fh)
                  gzclose(fh);
      }

      bool eos() const { return gzeof(fh) != 0; }
      bool ioFailed() const { return _ioError; }
      void clearIOFailed() { _ioError = false; }

      bool isOpen() const { return fh != 0; }

      uint32 read(void *dataPtr, uint32 dataSize) {
            assert(fh);
            int ret = gzread(fh, dataPtr, dataSize);
            if (ret <= -1)
                  _ioError = true;
            return ret;
      }
      uint32 write(const void *dataPtr, uint32 dataSize) {
            assert(fh);
            // 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
            int ret = gzwrite(fh, const_cast<void *>(dataPtr), dataSize);
            if (ret <= 0)
                  _ioError = true;
            return ret;
      }

      uint32 pos() const {
            assert(fh);
            return gztell(fh);
      }
      uint32 size() const {
            assert(fh);
            uint32 oldPos = gztell(fh);
            gzseek(fh, 0, SEEK_END);
            uint32 length = gztell(fh);
            gzseek(fh, oldPos, SEEK_SET);
            return length;
      }

      void seek(int32 offs, int whence = SEEK_SET) {
            assert(fh);
            gzseek(fh, offs, whence);
      }
};
#endif


static void 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) {
#if defined(__MORPHOS__) || defined(__amigaos4__)
            if (buf[dirLen-1] != ':' && buf[dirLen-1] != '/')
#endif

#if !defined(__GP32__) && !defined(PALMOS_MODE)
            strncat(buf, "/", bufsize-1); // prevent double /
#endif
      }
      strncat(buf, filename, bufsize-1);
}

OutSaveFile *DefaultSaveFileManager::openForSaving(const char *filename) {
      char buf[256];
      join_paths(filename, getSavePath(), buf, sizeof(buf));

#ifdef USE_ZLIB
      GzipSaveFile *sf = new GzipSaveFile(buf, true);
#else
      StdioSaveFile *sf = new StdioSaveFile(buf, true);
#endif

      if (!sf->isOpen()) {
            delete sf;
            sf = 0;
      }
      return sf;
}

InSaveFile *DefaultSaveFileManager::openForLoading(const char *filename) {
      char buf[256];
      join_paths(filename, getSavePath(), buf, sizeof(buf));

#ifdef USE_ZLIB
      GzipSaveFile *sf = new GzipSaveFile(buf, false);
#else
      StdioSaveFile *sf = new StdioSaveFile(buf, false);
#endif

      if (!sf->isOpen()) {
            delete sf;
            sf = 0;
      }
      return sf;
}

void DefaultSaveFileManager::listSavefiles(const char * /* prefix */, bool *marks, int num) {
      memset(marks, true, num * sizeof(bool));
}

} // End of namespace Common

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