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stdiostream.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-13-0/backends/fs/stdiostream.cpp $
 * $Id: stdiostream.cpp 35675 2009-01-02 18:00:12Z dhewg $
 *
 */

#include "backends/fs/stdiostream.h"

#include <errno.h>

#if defined(MACOSX) || defined(IPHONE)
#include "CoreFoundation/CoreFoundation.h"
#endif


#ifdef __PLAYSTATION2__
      // for those replaced fopen/fread/etc functions
      typedef unsigned long   uint64;
      typedef signed long     int64;
      #include "backends/platform/ps2/fileio.h"

      #define fopen(a, b)                 ps2_fopen(a, b)
      #define fclose(a)             ps2_fclose(a)
      #define fseek(a, b, c)              ps2_fseek(a, b, c)
      #define ftell(a)              ps2_ftell(a)
      #define feof(a)                     ps2_feof(a)
      #define fread(a, b, c, d)           ps2_fread(a, b, c, d)
      #define fwrite(a, b, c, d)          ps2_fwrite(a, b, c, d)

      //#define fprintf                   ps2_fprintf // used in common/util.cpp
      //#define fflush(a)                 ps2_fflush(a)     // used in common/util.cpp

      //#define fgetc(a)                  ps2_fgetc(a)      // not used
      //#define fgets(a, b, c)                  ps2_fgets(a, b, c)      // not used
      //#define fputc(a, b)               ps2_fputc(a, b)   // not used
      //#define fputs(a, b)               ps2_fputs(a, b)   // not used

      //#define fsize(a)                  ps2_fsize(a)      // not used -- and it is not a standard function either
#endif

#ifdef __DS__

      // These functions replace the standard library functions of the same name.
      // As this header is included after the standard one, I have the chance to #define
      // all of these to my own code.
      //
      // A #define is the only way, as redefinig the functions would cause linker errors.

      // These functions need to be #undef'ed, as their original definition
      // in devkitarm is done with #includes (ugh!)
      #undef feof
      #undef clearerr
      //#undef getc
      //#undef ferror

      #include "backends/fs/ds/ds-fs.h"


      // Only functions used in the ScummVM source have been defined here!
      #define fopen(name, mode)                             DS::std_fopen(name, mode)
      #define fclose(handle)                                DS::std_fclose(handle)
      #define fread(ptr, size, items, file)           DS::std_fread(ptr, size, items, file)
      #define fwrite(ptr, size, items, file)          DS::std_fwrite(ptr, size, items, file)
      #define feof(handle)                                  DS::std_feof(handle)
      #define ftell(handle)                                 DS::std_ftell(handle)
      #define fseek(handle, offset, whence)           DS::std_fseek(handle, offset, whence)
      #define clearerr(handle)                              DS::std_clearerr(handle)
      #define fflush(file)                                  DS::std_fflush(file)
      #undef ferror
      #define ferror(handle)                                DS::std_ferror(handle)

#endif

StdioStream::StdioStream(void *handle) : _handle(handle) {
      assert(handle);
}

StdioStream::~StdioStream() {
      fclose((FILE *)_handle);
}

bool StdioStream::err() const {
      return ferror((FILE *)_handle) != 0;
}

void StdioStream::clearErr() {
      clearerr((FILE *)_handle);
}

bool StdioStream::eos() const {
      return feof((FILE *)_handle) != 0;
}

int32 StdioStream::pos() const {
      return ftell((FILE *)_handle);
}

int32 StdioStream::size() const {
      int32 oldPos = ftell((FILE *)_handle);
      fseek((FILE *)_handle, 0, SEEK_END);
      int32 length = ftell((FILE *)_handle);
      fseek((FILE *)_handle, oldPos, SEEK_SET);

      return length;
}

bool StdioStream::seek(int32 offs, int whence) {
      return fseek((FILE *)_handle, offs, whence) == 0;
}

uint32 StdioStream::read(void *ptr, uint32 len) {
      return fread((byte *)ptr, 1, len, (FILE *)_handle);
}

uint32 StdioStream::write(const void *ptr, uint32 len) {
      return fwrite(ptr, 1, len, (FILE *)_handle);
}

bool StdioStream::flush() {
      return fflush((FILE *)_handle) == 0;
}

StdioStream *StdioStream::makeFromPath(const Common::String &path, bool writeMode) {
      FILE *handle = fopen(path.c_str(), writeMode ? "wb" : "rb");

#ifdef __amigaos4__
      //
      // Work around for possibility that someone uses AmigaOS "newlib" build
      // with SmartFileSystem (blocksize 512 bytes), leading to buffer size
      // being only 512 bytes. "Clib2" sets the buffer size to 8KB, resulting
      // smooth movie playback. This forces the buffer to be enough also when
      // using "newlib" compile on SFS.
      //
      if (handle && !writeMode) {
            setvbuf(handle, NULL, _IOFBF, 8192);
      }
#endif

#if defined(__WII__)
      // disable newlib's buffering, the device libraries handle caching
      if (handle)
            setvbuf(handle, NULL, _IONBF, 0);
#endif

      if (handle)
            return new StdioStream(handle);
      return 0;
}

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