/*

 * Extended attribute functions

 *

 * Copyright (C) 2009-2024, 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 <memory.h>

#include <types.h>

#include "libfshfs_allocation_block_stream.h"

#include "libfshfs_attribute_record.h"

#include "libfshfs_definitions.h"

#include "libfshfs_extended_attribute.h"

#include "libfshfs_extent.h"

#include "libfshfs_file_system.h"

#include "libfshfs_fork_descriptor.h"

#include "libfshfs_io_handle.h"

#include "libfshfs_libbfio.h"

#include "libfshfs_libcdata.h"

#include "libfshfs_libcerror.h"

#include "libfshfs_libcthreads.h"

#include "libfshfs_libfdata.h"

#include "libfshfs_types.h"

/* Creates an extended_attribute

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

 * Returns 1 if successful or -1 on error

 */

int libfshfs_extended_attribute_initialize(

     libfshfs_extended_attribute_t **extended_attribute,

     libfshfs_io_handle_t *io_handle,

     libbfio_handle_t *file_io_handle,

     libfshfs_file_system_t *file_system,

     uint32_t identifier,

     libfshfs_attribute_record_t *attribute_record,

     libcerror_error_t **error )

{

  libfshfs_internal_extended_attribute_t *internal_extended_attribute = NULL;

  static char *function                                               = "libfshfs_extended_attribute_initialize";

  if( extended_attribute == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid extended attribute.",

     function );

    return( -1 );

  }

  if( *extended_attribute != NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,

     "%s: invalid extended attribute value already set.",

     function );

    return( -1 );

  }

  if( attribute_record == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid attribute record.",

     function );

    return( -1 );

  }

  internal_extended_attribute = memory_allocate_structure(

                                 libfshfs_internal_extended_attribute_t );

  if( internal_extended_attribute == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create extended attribute.",

     function );

    goto on_error;

  }

  if( memory_set(

       internal_extended_attribute,

       0,

       sizeof( libfshfs_internal_extended_attribute_t ) ) == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_SET_FAILED,

     "%s: unable to clear extended attribute.",

     function );

    memory_free(

     internal_extended_attribute );

    return( -1 );

  }

  internal_extended_attribute->io_handle        = io_handle;

  internal_extended_attribute->file_io_handle   = file_io_handle;

  internal_extended_attribute->file_system      = file_system;

  internal_extended_attribute->identifier       = identifier;

  internal_extended_attribute->attribute_record = attribute_record;

#if defined( HAVE_MULTI_THREAD_SUPPORT ) && !defined( HAVE_LOCAL_LIBFSHFS )

  if( libcthreads_read_write_lock_initialize(

       &( internal_extended_attribute->read_write_lock ),

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_INITIALIZE_FAILED,

     "%s: unable to initialize read/write lock.",

     function );

    goto on_error;

  }

#endif

  *extended_attribute = (libfshfs_extended_attribute_t *) internal_extended_attribute;

  return( 1 );

on_error:

  if( internal_extended_attribute != NULL )

  {

    memory_free(

     internal_extended_attribute );

  }

  return( -1 );

}

/* Frees an extended attribute

 * Returns 1 if successful or -1 on error

 */

int libfshfs_extended_attribute_free(

     libfshfs_extended_attribute_t **extended_attribute,

     libcerror_error_t **error )

{

  libfshfs_internal_extended_attribute_t *internal_extended_attribute = NULL;

  static char *function                                               = "libfshfs_extended_attribute_free";

  int result                                                          = 1;

  if( extended_attribute == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid extended attribute.",

     function );

    return( -1 );

  }

  if( *extended_attribute != NULL )

  {

    internal_extended_attribute = (libfshfs_internal_extended_attribute_t *) *extended_attribute;

    *extended_attribute         = NULL;

#if defined( HAVE_MULTI_THREAD_SUPPORT ) && !defined( HAVE_LOCAL_LIBFSHFS )

    if( libcthreads_read_write_lock_free(

         &( internal_extended_attribute->read_write_lock ),

         error ) != 1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,

       "%s: unable to free read/write lock.",

       function );

      result = -1;

    }

#endif

    if( internal_extended_attribute->data_stream != NULL )

    {

      if( libfdata_stream_free(

           &( internal_extended_attribute->data_stream ),

           error ) != 1 )

      {

        libcerror_error_set(

         error,

         LIBCERROR_ERROR_DOMAIN_RUNTIME,

         LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,

         "%s: unable to free data stream.",

         function );

        result = -1;

      }

    }

    if( internal_extended_attribute->extents_array != NULL )

    {

      if( libcdata_array_free(

           &( internal_extended_attribute->extents_array ),

           (int (*)(intptr_t **, libcerror_error_t **)) &libfshfs_extent_free,

           error ) != 1 )

      {

        libcerror_error_set(

         error,

         LIBCERROR_ERROR_DOMAIN_RUNTIME,

         LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,

         "%s: unable to free extents array.",

         function );

        result = -1;

      }

    }

    memory_free(

     internal_extended_attribute );

  }

  return( result );

}

/* Retrieves the size of the UTF-8 encoded name

 * The returned size includes the end of string character

 * Returns 1 if successful or -1 on error

 */

int libfshfs_extended_attribute_get_utf8_name_size(

     libfshfs_extended_attribute_t *extended_attribute,

     size_t *utf8_string_size,

     libcerror_error_t **error )

{

  libfshfs_internal_extended_attribute_t *internal_extended_attribute = NULL;

  static char *function                                               = "libfshfs_extended_attribute_get_utf8_name_size";

  int result                                                          = 1;

  if( extended_attribute == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid extended attribute.",

     function );

    return( -1 );

  }

  internal_extended_attribute = (libfshfs_internal_extended_attribute_t *) extended_attribute;

#if defined( HAVE_LIBFSHFS_MULTI_THREAD_SUPPORT )

  if( libcthreads_read_write_lock_grab_for_read(

       internal_extended_attribute->read_write_lock,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to grab read/write lock for reading.",

     function );

    return( -1 );

  }

#endif

  if( libfshfs_attribute_record_get_utf8_name_size(

       internal_extended_attribute->attribute_record,

       utf8_string_size,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_GET_FAILED,

     "%s: unable to retrieve attribute record name UTF-8 string size.",

     function );

    result = -1;

  }

#if defined( HAVE_LIBFSHFS_MULTI_THREAD_SUPPORT )

  if( libcthreads_read_write_lock_release_for_read(

       internal_extended_attribute->read_write_lock,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to release read/write lock for reading.",

     function );

    return( -1 );

  }

#endif

  return( result );

}

/* Retrieves the UTF-8 encoded name

 * The size should include the end of string character

 * Returns 1 if successful or -1 on error

 */

int libfshfs_extended_attribute_get_utf8_name(

     libfshfs_extended_attribute_t *extended_attribute,

     uint8_t *utf8_string,

     size_t utf8_string_size,

     libcerror_error_t **error )

{

  libfshfs_internal_extended_attribute_t *internal_extended_attribute = NULL;

  static char *function                                               = "libfshfs_extended_attribute_get_utf8_name";

  int result                                                          = 1;

  if( extended_attribute == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid extended attribute.",

     function );

    return( -1 );

  }

  internal_extended_attribute = (libfshfs_internal_extended_attribute_t *) extended_attribute;

#if defined( HAVE_LIBFSHFS_MULTI_THREAD_SUPPORT )

  if( libcthreads_read_write_lock_grab_for_read(

       internal_extended_attribute->read_write_lock,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to grab read/write lock for reading.",

     function );

    return( -1 );

  }

#endif

  if( libfshfs_attribute_record_get_utf8_name(

       internal_extended_attribute->attribute_record,

       utf8_string,

       utf8_string_size,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_GET_FAILED,

     "%s: unable to retrieve attribute record name UTF-8 string.",

     function );

    result = -1;

  }

#if defined( HAVE_LIBFSHFS_MULTI_THREAD_SUPPORT )

  if( libcthreads_read_write_lock_release_for_read(

       internal_extended_attribute->read_write_lock,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to release read/write lock for reading.",

     function );

    return( -1 );

  }

#endif

  return( result );

}

/* Retrieves the size of the UTF-16 encoded name

 * The returned size includes the end of string character

 * Returns 1 if successful or -1 on error

 */

int libfshfs_extended_attribute_get_utf16_name_size(

     libfshfs_extended_attribute_t *extended_attribute,

     size_t *utf16_string_size,

     libcerror_error_t **error )

{

  libfshfs_internal_extended_attribute_t *internal_extended_attribute = NULL;

  static char *function                                               = "libfshfs_extended_attribute_get_utf16_name_size";

  int result                                                          = 1;

  if( extended_attribute == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid extended attribute.",

     function );

    return( -1 );

  }

  internal_extended_attribute = (libfshfs_internal_extended_attribute_t *) extended_attribute;

#if defined( HAVE_LIBFSHFS_MULTI_THREAD_SUPPORT )

  if( libcthreads_read_write_lock_grab_for_read(

       internal_extended_attribute->read_write_lock,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to grab read/write lock for reading.",

     function );

    return( -1 );

  }

#endif

  if( libfshfs_attribute_record_get_utf16_name_size(

       internal_extended_attribute->attribute_record,

       utf16_string_size,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_GET_FAILED,

     "%s: unable to retrieve attribute record name UTF-16 string size.",

     function );

    result = -1;

  }

#if defined( HAVE_LIBFSHFS_MULTI_THREAD_SUPPORT )

  if( libcthreads_read_write_lock_release_for_read(

       internal_extended_attribute->read_write_lock,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to release read/write lock for reading.",

     function );

    return( -1 );

  }

#endif

  return( result );

}

/* Retrieves the UTF-16 encoded name

 * The size should include the end of string character

 * Returns 1 if successful or -1 on error

 */

int libfshfs_extended_attribute_get_utf16_name(

     libfshfs_extended_attribute_t *extended_attribute,

     uint16_t *utf16_string,

     size_t utf16_string_size,

     libcerror_error_t **error )

{

  libfshfs_internal_extended_attribute_t *internal_extended_attribute = NULL;

  static char *function                                               = "libfshfs_extended_attribute_get_utf16_name";

  int result                                                          = 1;

  if( extended_attribute == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid extended attribute.",

     function );

    return( -1 );

  }

  internal_extended_attribute = (libfshfs_internal_extended_attribute_t *) extended_attribute;

#if defined( HAVE_LIBFSHFS_MULTI_THREAD_SUPPORT )

  if( libcthreads_read_write_lock_grab_for_read(

       internal_extended_attribute->read_write_lock,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to grab read/write lock for reading.",

     function );

    return( -1 );

  }

#endif

  if( libfshfs_attribute_record_get_utf16_name(

       internal_extended_attribute->attribute_record,

       utf16_string,

       utf16_string_size,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_GET_FAILED,

     "%s: unable to retrieve attribute record name UTF-16 string.",

     function );

    result = -1;

  }

#if defined( HAVE_LIBFSHFS_MULTI_THREAD_SUPPORT )

  if( libcthreads_read_write_lock_release_for_read(

       internal_extended_attribute->read_write_lock,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to release read/write lock for reading.",

     function );

    return( -1 );

  }

#endif

  return( result );

}

/* Determines the data stream

 * Returns 1 if successful or -1 on error

 */

int libfshfs_internal_extended_attribute_get_data_stream(

     libfshfs_internal_extended_attribute_t *internal_extended_attribute,

     libcerror_error_t **error )

{

  libfshfs_fork_descriptor_t *fork_descriptor = NULL;

  static char *function                       = "libfshfs_internal_extended_attribute_get_data_stream";

  int result                                  = 0;

  if( internal_extended_attribute == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid extended attribute.",

     function );

    return( -1 );

  }

  if( internal_extended_attribute->attribute_record == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_MISSING,

     "%s: invalid extended attribute - missing attribute record.",

     function );

    return( -1 );

  }

  if( internal_extended_attribute->data_stream != NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,

     "%s: invalid extended attribute - data stream value already set.",

     function );

    return( -1 );

  }

  if( internal_extended_attribute->attribute_record->record_type == LIBFSHFS_ATTRIBUTE_RECORD_TYPE_INLINE_DATA )

  {

    result = libfshfs_allocation_block_stream_initialize_from_data(

              &( internal_extended_attribute->data_stream ),

              internal_extended_attribute->attribute_record->inline_data,

              internal_extended_attribute->attribute_record->inline_data_size,

              error );

  }

  else if( internal_extended_attribute->attribute_record->record_type == LIBFSHFS_ATTRIBUTE_RECORD_TYPE_FORK_DATA )

  {

    if( libfshfs_attribute_record_get_fork_descriptor(

         internal_extended_attribute->attribute_record,

         &fork_descriptor,

         error ) != 1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_GET_FAILED,

       "%s: unable to retrieve fork descriptor from attribute record.",

       function );

      goto on_error;

    }

    result = libfshfs_allocation_block_stream_initialize_from_fork_descriptor(

              &( internal_extended_attribute->data_stream ),

              internal_extended_attribute->io_handle,

              fork_descriptor,

              error );

  }

/* TODO add support for LIBFSHFS_ATTRIBUTE_RECORD_TYPE_EXTENTS */

  else

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,

     "%s: unsupported attribute record type.",

     function );

    goto on_error;

  }

  if( result != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_INITIALIZE_FAILED,

     "%s: unable to create data stream.",

     function );

    return( -1 );

  }

  return( 1 );

on_error:

  if( internal_extended_attribute->extents_array != NULL )

  {

    libcdata_array_free(

     &( internal_extended_attribute->extents_array ),

     (int (*)(intptr_t **, libcerror_error_t **)) &libfshfs_extent_free,

     NULL );

  }

  return( -1 );

}

/* Reads data at the current offset into a buffer

 * Returns the number of bytes read or -1 on error

 */

ssize_t libfshfs_extended_attribute_read_buffer(

         libfshfs_extended_attribute_t *extended_attribute,

         void *buffer,

         size_t buffer_size,

         libcerror_error_t **error )

{

  libfshfs_internal_extended_attribute_t *internal_extended_attribute = NULL;

  static char *function                                               = "libfshfs_extended_attribute_read_buffer";

  ssize_t read_count                                                  = 0;

  if( extended_attribute == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid extended attribute.",

     function );

    return( -1 );

  }

  internal_extended_attribute = (libfshfs_internal_extended_attribute_t *) extended_attribute;

#if defined( HAVE_LIBFSHFS_MULTI_THREAD_SUPPORT )

  if( libcthreads_read_write_lock_grab_for_write(

       internal_extended_attribute->read_write_lock,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to grab read/write lock for writing.",

     function );

    return( -1 );

  }

#endif

  if( internal_extended_attribute->data_stream == NULL )

  {

    if( libfshfs_internal_extended_attribute_get_data_stream(

         internal_extended_attribute,

         error ) != 1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_GET_FAILED,

       "%s: unable to determine data stream.",

       function );

      read_count = -1;

    }

  }

  if( internal_extended_attribute->data_stream != NULL )

  {

    read_count = libfdata_stream_read_buffer(

                  internal_extended_attribute->data_stream,

                  (intptr_t *) internal_extended_attribute->file_io_handle,

                  (uint8_t *) buffer,

                  buffer_size,

                  0,

                  error );

    if( read_count < 0 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_IO,

       LIBCERROR_IO_ERROR_READ_FAILED,

       "%s: unable to read buffer from data stream.",

       function );

      read_count = -1;

    }

  }

#if defined( HAVE_LIBFSHFS_MULTI_THREAD_SUPPORT )

  if( libcthreads_read_write_lock_release_for_write(

       internal_extended_attribute->read_write_lock,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to release read/write lock for writing.",

     function );

    return( -1 );

  }

#endif

  return( read_count );

}

/* Reads data at a specific offset

 * Returns the number of bytes read or -1 on error

 */

ssize_t libfshfs_extended_attribute_read_buffer_at_offset(

         libfshfs_extended_attribute_t *extended_attribute,

         void *buffer,

         size_t buffer_size,

         off64_t offset,

         libcerror_error_t **error )

{

  libfshfs_internal_extended_attribute_t *internal_extended_attribute = NULL;

  static char *function                                               = "libfshfs_extended_attribute_read_buffer_at_offset";

  ssize_t read_count                                                  = 0;

  if( extended_attribute == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid extended attribute.",

     function );

    return( -1 );

  }

  internal_extended_attribute = (libfshfs_internal_extended_attribute_t *) extended_attribute;

#if defined( HAVE_LIBFSHFS_MULTI_THREAD_SUPPORT )

  if( libcthreads_read_write_lock_grab_for_write(

       internal_extended_attribute->read_write_lock,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to grab read/write lock for writing.",

     function );

    return( -1 );

  }

#endif

  if( internal_extended_attribute->data_stream == NULL )

  {

    if( libfshfs_internal_extended_attribute_get_data_stream(

         internal_extended_attribute,

         error ) != 1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_GET_FAILED,

       "%s: unable to determine data stream.",

       function );

      read_count = -1;

    }

  }

  if( internal_extended_attribute->data_stream != NULL )

  {

    read_count = libfdata_stream_read_buffer_at_offset(

                  internal_extended_attribute->data_stream,

                  (intptr_t *) internal_extended_attribute->file_io_handle,

                  (uint8_t *) buffer,

                  buffer_size,

                  offset,

                  0,

                  error );

    if( read_count < 0 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_IO,

       LIBCERROR_IO_ERROR_READ_FAILED,

       "%s: unable to read buffer at offset from data stream.",

       function );

      read_count = -1;

    }

  }

#if defined( HAVE_LIBFSHFS_MULTI_THREAD_SUPPORT )

  if( libcthreads_read_write_lock_release_for_write(

       internal_extended_attribute->read_write_lock,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to release read/write lock for writing.",

     function );

    return( -1 );

  }

#endif

  return( read_count );

}

/* Seeks a certain offset

 * Returns the offset if seek is successful or -1 on error

 */

off64_t libfshfs_extended_attribute_seek_offset(

         libfshfs_extended_attribute_t *extended_attribute,

         off64_t offset,

         int whence,

         libcerror_error_t **error )

{

  libfshfs_internal_extended_attribute_t *internal_extended_attribute = NULL;

  static char *function                                               = "libfshfs_extended_attribute_seek_offset";

  if( extended_attribute == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid extended attribute.",

     function );

    return( -1 );

  }

  internal_extended_attribute = (libfshfs_internal_extended_attribute_t *) extended_attribute;

#if defined( HAVE_LIBFSHFS_MULTI_THREAD_SUPPORT )

  if( libcthreads_read_write_lock_grab_for_write(

       internal_extended_attribute->read_write_lock,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to grab read/write lock for writing.",

     function );

    return( -1 );

  }

#endif

  if( internal_extended_attribute->data_stream == NULL )

  {

    if( libfshfs_internal_extended_attribute_get_data_stream(

         internal_extended_attribute,

         error ) != 1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_GET_FAILED,

       "%s: unable to determine data stream.",

       function );

      offset = -1;

    }

  }

  if( internal_extended_attribute->data_stream != NULL )

  {

    offset = libfdata_stream_seek_offset(

              internal_extended_attribute->data_stream,

              offset,

              whence,

              error );

    if( offset < 0 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_IO,

       LIBCERROR_IO_ERROR_SEEK_FAILED,

       "%s: unable to seek offset in data stream.",

       function );