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be_save.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2006 The ScummVM project
 * Copyright (C) 2002-2006 Chris Apers - PalmOS Backend
 *
 * 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/backends/platform/PalmOS/Src/be_save.cpp $
 * $Id: be_save.cpp 22955 2006-06-06 18:34:03Z chrilith $
 *
 */

#include "be_base.h"
#include "common/savefile.h"

// SaveFile class

class PalmSaveFile : public Common::SaveFile {
private:
      FILE *fh;
public:
      PalmSaveFile(const char *filename, bool saveOrLoad) {
            fh = ::fopen(filename, (saveOrLoad? "wb" : "rb"));
      }
      ~PalmSaveFile() {
            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 != NULL; }

      uint32 read(void *buf, uint32 size);
      uint32 write(const void *buf, uint32 size);

      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);
      }
};

uint32 PalmSaveFile::read(void *buf, uint32 size) {
      // we must return the size, where fread return nitems upon success ( 1 <=> size)
      if (fh) return (::fread(buf, 1, size, fh));
      return 0;
}

uint32 PalmSaveFile::write(const void *buf, uint32 size) {
      // we must return the size, where fwrite return nitems upon success ( 1 <=> size)
      if (fh) return ::fwrite(buf, 1, size, fh);
      return 0;
}





// SaveFileManager class

class PalmSaveFileManager : public Common::SaveFileManager {
public:
      virtual Common::OutSaveFile *openForSaving(const char *filename) {
            return openSavefile(filename, true);
      }
      virtual Common::InSaveFile *openForLoading(const char *filename) {
            return openSavefile(filename, false);
      }

      Common::SaveFile *openSavefile(const char *filename, bool saveOrLoad);
      void listSavefiles(const char *prefix, bool *marks, int num);

protected:
      Common::SaveFile *makeSaveFile(const char *filename, bool saveOrLoad);
};

Common::SaveFile *PalmSaveFileManager::openSavefile(const char *filename, bool saveOrLoad) {
      char buf[256];

      strcpy(buf, getSavePath());
      strcat(buf, "/");
      strcat(buf, filename);

      return makeSaveFile(buf, saveOrLoad);
}

void PalmSaveFileManager::listSavefiles(const char *prefix, bool *marks, int num) {
      FileRef fileRef;
      // try to open the dir
      Err e = VFSFileOpen(gVars->VFS.volRefNum, getSavePath(), vfsModeRead, &fileRef);
      memset(marks, false, num*sizeof(bool));

      if (e != errNone)
            return;

      // enumerate all files
      UInt32 dirEntryIterator = vfsIteratorStart;
      Char filename[32];
      FileInfoType info = {0, filename, 32};
      UInt16 length = StrLen(prefix);
      int slot = 0;

      while (dirEntryIterator != vfsIteratorStop) {
            e = VFSDirEntryEnumerate (fileRef, &dirEntryIterator, &info);

            if (e != expErrEnumerationEmpty) {                                                  // there is something

                  if (StrLen(info.nameP) == (length + 2)) {                               // consider max 99, filename length is ok
                        if (StrNCaselessCompare(prefix, info.nameP, length) == 0) { // this seems to be a save file
                              if (isdigit(info.nameP[length]) && isdigit(info.nameP[length+1])) {

                                    slot = StrAToI(filename + length);
                                    if (slot >= 0 && slot < num)
                                          *(marks+slot) = true;

                              }
                        }
                  }

            }
      }

      VFSFileClose(fileRef);
}

Common::SaveFile *PalmSaveFileManager::makeSaveFile(const char *filename, bool saveOrLoad) {
      PalmSaveFile *sf = new PalmSaveFile(filename, saveOrLoad);

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

Common::SaveFileManager *OSystem_PalmBase::getSavefileManager() {
      return new PalmSaveFileManager();
}

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