/*

 * Export table functions

 *

 * Copyright (C) 2011-2023, 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>

#include "libexe_export_table.h"

#include "libexe_libcerror.h"

#include "libexe_libcnotify.h"

#include "libexe_libfcache.h"

#include "libexe_libfdata.h"

/* Creates an export table

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

 * Returns 1 if successful or -1 on error

 */

int libexe_export_table_initialize(

     libexe_export_table_t **export_table,

     libcerror_error_t **error )

{

  static char *function = "libexe_export_table_initialize";

  if( export_table == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid export table.",

     function );

    return( -1 );

  }

  if( *export_table != NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,

     "%s: invalid export table value already set.",

     function );

    return( -1 );

  }

  *export_table = memory_allocate_structure(

                   libexe_export_table_t );

  if( *export_table == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create export table.",

     function );

    goto on_error;

  }

  if( memory_set(

       *export_table,

       0,

       sizeof( libexe_export_table_t ) ) == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_SET_FAILED,

     "%s: unable to clear export table.",

     function );

    memory_free(

     *export_table );

    *export_table = NULL;

    return( -1 );

  }

  return( 1 );

on_error:

  if( *export_table != NULL )

  {

    memory_free(

     *export_table );

    *export_table = NULL;

  }

  return( -1 );

}

/* Frees an export table

 * Returns 1 if successful or -1 on error

 */

int libexe_export_table_free(

     libexe_export_table_t **export_table,

     libcerror_error_t **error )

{

  static char *function = "libexe_export_table_free";

  if( export_table == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid export table.",

     function );

    return( -1 );

  }

  if( *export_table != NULL )

  {

    memory_free(

     *export_table );

    *export_table = NULL;

  }

  return( 1 );

}

/* Reads the export table

 * Returns 1 if successful or -1 on error

 */

int libexe_export_table_read(

     libexe_export_table_t *export_table,

     libbfio_handle_t *file_io_handle,

     off64_t file_offset,

     uint32_t size,

     libcerror_error_t **error )

{

  uint8_t *data         = NULL;

  static char *function = "libexe_export_table_read";

  size_t read_count     = 0;

  if( export_table == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid export table.",

     function );

    return( -1 );

  }

  if( ( size == 0 )

   || ( size > MEMORY_MAXIMUM_ALLOCATION_SIZE ) )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_OUT_OF_BOUNDS,

     "%s: invalid size value out of bounds.",

     function );

    return( -1 );

  }

  data = (uint8_t *) memory_allocate(

                      sizeof( uint8_t ) * size );

  if( data == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create export table.",

     function );

    goto on_error;

  }

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: reading export table at offset: %" PRIi64 " (0x%08" PRIx64 ")\n",

     function,

     file_offset,

     file_offset );

  }

#endif

  read_count = libbfio_handle_read_buffer_at_offset(

                file_io_handle,

                data,

                size,

                file_offset,

                error );

  if( read_count != (ssize_t) size )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_IO,

     LIBCERROR_IO_ERROR_READ_FAILED,

     "%s: unable to read export table data at offset: %" PRIi64 " (0x%08" PRIx64 ").",

     function,

     file_offset,

     file_offset );

    goto on_error;

  }

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: export table:\n",

     function );

    libcnotify_print_data(

     data,

     (size_t) size,

     0 );

  }

#endif

  /* TODO extract values */

  memory_free(

   data );

  return( 1 );

on_error:

  if( data != NULL )

  {

    memory_free(

     data );

  }

  return( -1 );

}