stdiostream.cpp

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/* 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.
 *
 */

#if !defined(DISABLE_STDIO_FILESTREAM)

// Disable symbol overrides so that we can use FILE, fopen etc.
#define FORBIDDEN_SYMBOL_ALLOW_ALL

#include "backends/fs/stdiostream.h"

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;
}

#endif