/*

 * LE header functions

 *

 * Copyright (C) 2011-2026, 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 <byte_stream.h>

#include <memory.h>

#include <types.h>

#include "libexe_le_header.h"

#include "libexe_libcerror.h"

#include "libexe_libcnotify.h"

#include "exe_le_header.h"

/* Creates a LE header

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

 * Returns 1 if successful or -1 on error

 */

int libexe_le_header_initialize(

     libexe_le_header_t **le_header,

     libcerror_error_t **error )

{

  static char *function = "libexe_le_header_initialize";

  if( le_header == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid LE header.",

     function );

    return( -1 );

  }

  if( *le_header != NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,

     "%s: invalid LE header value already set.",

     function );

    return( -1 );

  }

  *le_header = memory_allocate_structure(

                libexe_le_header_t );

  if( *le_header == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create LE header.",

     function );

    goto on_error;

  }

  if( memory_set(

       *le_header,

       0,

       sizeof( libexe_le_header_t ) ) == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_SET_FAILED,

     "%s: unable to clear file.",

     function );

    goto on_error;

  }

  return( 1 );

on_error:

  if( *le_header != NULL )

  {

    memory_free(

     *le_header );

    *le_header = NULL;

  }

  return( -1 );

}

/* Frees a LE header

 * Returns 1 if successful or -1 on error

 */

int libexe_le_header_free(

     libexe_le_header_t **le_header,

     libcerror_error_t **error )

{

  static char *function = "libexe_le_header_free";

  if( le_header == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid LE header.",

     function );

    return( -1 );

  }

  if( *le_header != NULL )

  {

    memory_free(

     *le_header );

    *le_header = NULL;

  }

  return( 1 );

}

/* Reads the LE header

 * Returns 1 if successful or -1 on error

 */

int libexe_le_header_read_data(

     libexe_le_header_t *le_header,

     const uint8_t *data,

     size_t data_size,

     libcerror_error_t **error )

{

  static char *function = "libexe_le_header_read_data";

  if( le_header == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid LE header.",

     function );

    return( -1 );

  }

  if( data == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid data.",

     function );

    return( -1 );

  }

  if( data_size < sizeof( exe_le_header_t ) )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,

     "%s: invalid data size value too small.",

     function );

    return( -1 );

  }

  if( data_size > (size_t) SSIZE_MAX )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_EXCEEDS_MAXIMUM,

     "%s: invalid data size value exceeds maximum.",

     function );

    return( -1 );

  }

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: LE header:\n",

     function );

    libcnotify_print_data(

     data,

     sizeof( exe_le_header_t ),

     0 );

  }

#endif

  if( memory_compare(

       ( (exe_le_header_t *) data )->signature,

       EXE_LE_SIGNATURE,

       2 ) != 0 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_UNSUPPORTED_VALUE,

     "%s: invalid signature.",

     function );

    return( -1 );

  }

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: signature\t\t\t\t: %c%c\n",

     function,

     ( (exe_le_header_t *) data )->signature[ 0 ],

     ( (exe_le_header_t *) data )->signature[ 1 ] );

/* TODO */

    libcnotify_printf(

     "\n" );

  }

#endif

  return( 1 );

}

/* Reads the LE header from a Basic File IO (bfio) handle

 * Returns 1 if successful or -1 on error

 */

int libexe_le_header_read_file_io_handle(

     libexe_le_header_t *le_header,

     libbfio_handle_t *file_io_handle,

     off64_t file_offset,

     libcerror_error_t **error )

{

  uint8_t data[ sizeof( exe_le_header_t ) ];

  static char *function = "libexe_le_header_read_file_io_handle";

  ssize_t read_count    = 0;

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: reading LE header 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,

                sizeof( exe_le_header_t ),

                file_offset,

                error );

  if( read_count != (ssize_t) sizeof( exe_le_header_t ) )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_IO,

     LIBCERROR_IO_ERROR_READ_FAILED,

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

     function,

     file_offset,

     file_offset );

    return( -1 );

  }

  if( libexe_le_header_read_data(

       le_header,

       data,

       sizeof( exe_le_header_t ),

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_IO,

     LIBCERROR_IO_ERROR_READ_FAILED,

     "%s: unable to read LE header at offset: %" PRIi64 " (0x%08" PRIx64 ").",

     function,

     file_offset,

     file_offset );

    return( -1 );

  }

  return( 1 );

}