// -*- c++ -*-

/*
 * Jakelib2 - General purpose C++ library
 * Copyright (C) 2001 Florian Wolff  (florian@donuz.de)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * $Id: FileInputStream.jlc,v 1.8 2006-02-11 11:31:25 florian Exp $
 */


#include "jakelib2.h"
#include "jakelib2/io/FileInputStream.h"
#include "jakelib2/io/File.h"
#include "jakelib2/lang/System.h"

#ifdef HAVE_ERRNO_H
# include <errno.h>
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

using namespace jakelib::lang;
using namespace jakelib::io;

JAKELIB_IMPLEMENT_CLASS("jakelib.io.FileInputStream", FileInputStream, InputStream)


/*****************************************************************************\
 * FileInputStream                                                            |
 *****************************************************************************/
FileInputStream::FileInputStream(File* file)
{
  init(file->getPath());
}

FileInputStream::FileInputStream(char* filename)
{
  String _filename(filename);
  init(&_filename);
}

FileInputStream::FileInputStream(String* filename)
{
  init(filename);
}

FileInputStream::~FileInputStream()
{
  close();
}


/*****************************************************************************\
 * init                                                                       |
 *****************************************************************************/
void FileInputStream::init(String* filename)
{
#if defined(JAKELIB_WIN32API)

  handle = CreateFile(JAKELIB_LATIN1(filename), GENERIC_READ,
                      FILE_SHARE_READ, NULL, OPEN_EXISTING,
                      FILE_ATTRIBUTE_NORMAL, NULL);
  
  if (handle == INVALID_HANDLE_VALUE) {
    throw new FileNotFoundException(System::explainErrorCode(GetLastError())
                                    .. JAKELIB_AT2("jakelib.io.FileInputStream.init"),
                                    filename);
  }

#else

  handle = open(JAKELIB_LATIN1(filename), O_RDONLY);
   
  if (handle == -1) {
    throw new FileNotFoundException(System::explainErrorCode(errno)
                                    .. JAKELIB_AT2("jakelib.io.FileInputStream.init"),
                                    filename);
  }

#endif
}


/*****************************************************************************\
 * read                                                                       |
 *****************************************************************************/
int FileInputStream::read()
{
  jbyte b;
  long r;
  r = read(&b, 0, 1);
  if (r == 1)
    return b & 0xff;
  else 
    return -1;
}


/*****************************************************************************\
 * read                                                                       |
 *****************************************************************************/
int FileInputStream::read(jbyte* b, int offset, int len)
{
  if (b == null)
    throw new NullPointerException(JAKELIB_AT2("jakelib.io.FileInputStream.read"));
  else if (len < 0 || offset < 0)
    throw new IndexOutOfBoundsException(JAKELIB_AT2("jakelib.io.FileInputStream.read"));
  else if (len == 0)
    return 0;
  
#if defined(JAKELIB_WIN32API)

  DWORD r;
  
  if (!ReadFile(handle, &b[offset], len, &r, NULL)) {
    throw new IOException(System::explainErrorCode(GetLastError())
                      .. JAKELIB_AT2("jakelib.io.FileInputStream.read"));
  }

  if (r == 0)
    return -1;
  else
    return r;

#else

  int r;

  if ((r = ::read(handle, (char*) &b[offset], len)) < 0) {
    throw new IOException(System::explainErrorCode(errno)
                      .. JAKELIB_AT2("jakelib.io.FileInputStream.read"));
  }

  if (r == 0)
    return -1;
  else
    return r;

#endif
}


/*****************************************************************************\
 * close                                                                      |
 *****************************************************************************/
void FileInputStream::close()
{
#if defined(JAKELIB_WIN32API)

  if (handle != INVALID_HANDLE_VALUE) {
    CloseHandle(handle);
    handle = INVALID_HANDLE_VALUE;
  }

#else

  if (handle != -1) {
    ::close(handle);
    handle = -1;
  }

#endif
}


/*****************************************************************************\
 * reset                                                                      |
 *****************************************************************************/
void FileInputStream::reset()
{
#if defined(JAKELIB_WIN32API)
  // FIXME
#else

  lseek(handle, 0, SEEK_SET);

#endif
}


/*****************************************************************************\
 * available                                                                  |
 *****************************************************************************/
int FileInputStream::available()
{
  // FIXME
  return 0;
}


/*****************************************************************************\
 * skip                                                                       |
 *****************************************************************************/
int FileInputStream::skip(int n)
{
  // FIXME
  return 0;
}