/*      $NetBSD: file_fat.cpp,v 1.5 2008/04/28 20:23:20 martin Exp $    */

/*-
 * Copyright (c) 2001, 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by UCHIYAMA Yasushi.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <file.h>
#include <file_fat.h>
#include <console.h>

FatFile::FatFile(Console *&cons)
        : File(cons)
{

        _debug = TRUE;
        DPRINTF((TEXT("FileManager: FAT\n")));
}

FatFile::~FatFile(void)
{

}

BOOL
FatFile::setRoot(TCHAR *drive)
{

        wcsncpy(_drive, drive, MAX_PATH);
        wcsncpy(_filename, drive, MAX_PATH);

        return TRUE;
}

BOOL
FatFile::open(const TCHAR *name, uint32_t flags)
{
        // drive + filename
        wsprintf(_filename, TEXT("%s%s"), _drive, name);

        // open it.
        _handle = CreateFile(_filename, GENERIC_READ, 0, 0,
            OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
        if (_handle == INVALID_HANDLE_VALUE) {
                DPRINTF((TEXT("can't open \"%s\". cause = %d\n"),
                    _filename, GetLastError()));
                return FALSE;
        }

        size_t sz = size();
        if (sz == ~0) {
                DPRINTF((TEXT("can't get file size.\n")));
                CloseHandle(_handle);
                return FALSE;
        }
        DPRINTF((TEXT("open file \"%s\"(%d byte).\n"), _filename, sz));

        return TRUE;
}

size_t
FatFile::read(void *buf, size_t bytes, off_t ofs)
{
        unsigned long readed;

        if (ofs != -1)
                SetFilePointer(_handle, ofs, 0, FILE_BEGIN);
        ReadFile(_handle, buf, bytes, &readed, 0);

        return size_t(readed);
}

size_t
FatFile::write(const void *buf, size_t bytes, off_t ofs)
{
        unsigned long wrote;

        if (ofs != -1)
                SetFilePointer(_handle, ofs, 0, FILE_BEGIN);
        WriteFile(_handle, buf, bytes, &wrote, 0);

        return size_t(wrote);
}

BOOL
FatFile::seek(off_t ofs)
{

        SetFilePointer(_handle, ofs, 0, FILE_BEGIN);

        return TRUE;
}