/*

 * Notification stream functions

 *

 * Copyright (C) 2008-2024, Joachim Metz <joachim.metz@gmail.com>

 *

 * Refer to AUTHORS for acknowledgements.

 *

 * This program 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 3 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 Lesser General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>.

 */

#include <common.h>

#include <file_stream.h>

#include <types.h>

#if defined( HAVE_ERRNO_H ) || defined( WINAPI )

#include <errno.h>

#endif

#include "libcnotify_libcerror.h"

#include "libcnotify_stream.h"

/* The notification stream

 */

FILE *libcnotify_stream = NULL;

/* Value to indicate if the notification stream

 * was opened by the library

 */

int libcnotify_stream_opened_in_library = 0;

/* Set the stream

 * Returns 1 if successful or -1 on error

 */

int libcnotify_stream_set(

     FILE *stream,

     libcerror_error_t **error )

{

  static char *function = "libcnotify_stream_set";

  if( libcnotify_stream_opened_in_library != 0 )

  {

    if( libcnotify_stream_close(

         error ) != 0 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_IO,

       LIBCERROR_IO_ERROR_OPEN_FAILED,

       "%s: unable to close notify stream.",

       function );

      return( -1 );

    }

  }

  libcnotify_stream = stream;

  return( 1 );

}

/* Opens the notification stream using a filename

 * The stream is opened in append mode

 * Returns 1 if successful or -1 on error

 */

int libcnotify_stream_open(

     const char *filename,

     libcerror_error_t **error )

{

  static char *function = "libcnotify_stream_open";

  if( filename == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid filename.",

     function );

    return( -1 );

  }

  if( libcnotify_stream_opened_in_library != 0 )

  {

    if( libcnotify_stream_close(

         error ) != 0 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_IO,

       LIBCERROR_IO_ERROR_OPEN_FAILED,

       "%s: unable to close notify stream.",

       function );

      return( -1 );

    }

  }

  libcnotify_stream = file_stream_open(

                      filename,

                      FILE_STREAM_OPEN_APPEND );

  if( libcnotify_stream == NULL )

  {

    switch( errno )

    {

      case EACCES:

        libcerror_error_set(

         error,

         LIBCERROR_ERROR_DOMAIN_IO,

         LIBCERROR_IO_ERROR_ACCESS_DENIED,

         "%s: access denied to file: %s.",

         function,

         filename );

        break;

      case ENOENT:

        libcerror_error_set(

         error,

         LIBCERROR_ERROR_DOMAIN_IO,

         LIBCERROR_IO_ERROR_INVALID_RESOURCE,

         "%s: no such file: %s.",

         function,

         filename );

        break;

      default:

        libcerror_error_set(

         error,

         LIBCERROR_ERROR_DOMAIN_IO,

         LIBCERROR_IO_ERROR_OPEN_FAILED,

         "%s: unable to open file: %s.",

         function,

         filename );

        break;

    }

    return( -1 );

  }

  libcnotify_stream_opened_in_library = 1;

  return( 1 );

}

/* Closes the notification stream if opened using a filename

 * Returns 0 if successful or -1 on error

 */

int libcnotify_stream_close(

     libcerror_error_t **error )

{

  static char *function = "libcnotify_stream_close";

  if( libcnotify_stream_opened_in_library != 0 )

  {

    if( file_stream_close(

         libcnotify_stream ) != 0 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_IO,

       LIBCERROR_IO_ERROR_OPEN_FAILED,

       "%s: unable to close stream.",

       function );

      return( -1 );

    }

    libcnotify_stream                   = NULL;

    libcnotify_stream_opened_in_library = 0;

  }

  return( 0 );

}