/*

 * Memory range functions

 *

 * Copyright (C) 2009-2022, 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 <memory.h>

#include <types.h>

#if defined( HAVE_UNISTD_H )

#include <unistd.h>

#endif

#include "libbfio_definitions.h"

#include "libbfio_handle.h"

#include "libbfio_libcerror.h"

#include "libbfio_memory_range.h"

#include "libbfio_memory_range_io_handle.h"

#include "libbfio_types.h"

/* Creates a memory range handle

 * Make sure the value handle is referencing, is set to NULL

 * Returns 1 if successful or -1 on error

 */

int libbfio_memory_range_initialize(

     libbfio_handle_t **handle,

     libcerror_error_t **error )

{

  libbfio_memory_range_io_handle_t *memory_range_io_handle = NULL;

  static char *function                                    = "libbfio_memory_range_initialize";

  if( handle == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid handle.",

     function );

    return( -1 );

  }

  if( *handle != NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,

     "%s: invalid handle value already set.",

     function );

    return( -1 );

  }

  if( libbfio_memory_range_io_handle_initialize(

       &memory_range_io_handle,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_INITIALIZE_FAILED,

     "%s: unable to create memory range IO handle.",

     function );

    goto on_error;

  }

  if( libbfio_handle_initialize(

       handle,

       (intptr_t *) memory_range_io_handle,

       (int (*)(intptr_t **, libcerror_error_t **)) libbfio_memory_range_io_handle_free,

       (int (*)(intptr_t **, intptr_t *, libcerror_error_t **)) libbfio_memory_range_io_handle_clone,

       (int (*)(intptr_t *, int, libcerror_error_t **)) libbfio_memory_range_io_handle_open,

       (int (*)(intptr_t *, libcerror_error_t **)) libbfio_memory_range_io_handle_close,

       (ssize_t (*)(intptr_t *, uint8_t *, size_t, libcerror_error_t **)) libbfio_memory_range_io_handle_read_buffer,

       (ssize_t (*)(intptr_t *, const uint8_t *, size_t, libcerror_error_t **)) libbfio_memory_range_io_handle_write_buffer,

       (off64_t (*)(intptr_t *, off64_t, int, libcerror_error_t **)) libbfio_memory_range_io_handle_seek_offset,

       (int (*)(intptr_t *, libcerror_error_t **)) libbfio_memory_range_io_handle_exists,

       (int (*)(intptr_t *, libcerror_error_t **)) libbfio_memory_range_io_handle_is_open,

       (int (*)(intptr_t *, size64_t *, libcerror_error_t **)) libbfio_memory_range_io_handle_get_size,

       LIBBFIO_FLAG_IO_HANDLE_MANAGED | LIBBFIO_FLAG_IO_HANDLE_CLONE_BY_FUNCTION,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_INITIALIZE_FAILED,

     "%s: unable to create handle.",

     function );

    goto on_error;

  }

  return( 1 );

on_error:

  if( memory_range_io_handle != NULL )

  {

    libbfio_memory_range_io_handle_free(

     &memory_range_io_handle,

     NULL );

  }

  return( -1 );

}

/* Retrieves the range of the memory range handle

 * Returns 1 if succesful or -1 on error

 */

int libbfio_memory_range_get(

     libbfio_handle_t *handle,

     uint8_t **range_start,

     size_t *range_size,

     libcerror_error_t **error )

{

  libbfio_internal_handle_t *internal_handle = NULL;

  static char *function                      = "libbfio_memory_range_get";

  if( handle == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid handle.",

     function );

    return( -1 );

  }

  internal_handle = (libbfio_internal_handle_t *) handle;

  if( libbfio_memory_range_io_handle_get(

       (libbfio_memory_range_io_handle_t *) internal_handle->io_handle,

       range_start,

       range_size,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_GET_FAILED,

     "%s: unable to retrieve range from file IO handle.",

     function );

    return( -1 );

  }

  return( 1 );

}

/* Sets the range of the memory range handle

 * Returns 1 if succesful or -1 on error

 */

int libbfio_memory_range_set(

     libbfio_handle_t *handle,

     uint8_t *range_start,

     size_t range_size,

     libcerror_error_t **error )

{

  libbfio_internal_handle_t *internal_handle = NULL;

  static char *function                      = "libbfio_memory_range_set";

  if( handle == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid handle.",

     function );

    return( -1 );

  }

  internal_handle = (libbfio_internal_handle_t *) handle;

  if( libbfio_memory_range_io_handle_set(

       (libbfio_memory_range_io_handle_t *) internal_handle->io_handle,

       range_start,

       range_size,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to set range in file IO handle.",

     function );

    return( -1 );

  }

  return( 1 );

}