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Path: ~/home/getwphos/public_html/bubrupamjcb.com/wp-includes/

File Content: `class-avif-info.php`

<?php
/**
 * Copyright (c) 2021, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 *
 * Note: this class is from libavifinfo - https://aomedia.googlesource.com/libavifinfo/+/refs/heads/main/avifinfo.php at f509487.
 * It is used as a fallback to parse AVIF files when the server doesn't support AVIF,
 * primarily to identify the width and height of the image.
 *
 * Note PHP 8.2 added native support for AVIF, so this class can be removed when WordPress requires PHP 8.2.
 */

namespace Avifinfo;

const FOUND     = 0; // Input correctly parsed and information retrieved.
const NOT_FOUND = 1; // Input correctly parsed but information is missing or elsewhere.
const TRUNCATED = 2; // Input correctly parsed until missing bytes to continue.
const ABORTED   = 3; // Input correctly parsed until stopped to avoid timeout or crash.
const INVALID   = 4; // Input incorrectly parsed.

const MAX_SIZE      = 4294967295; // Unlikely to be insufficient to parse AVIF headers.
const MAX_NUM_BOXES = 4096;       // Be reasonable. Avoid timeouts and out-of-memory.
const MAX_VALUE     = 255;
const MAX_TILES     = 16;
const MAX_PROPS     = 32;
const MAX_FEATURES  = 8;
const UNDEFINED     = 0;          // Value was not yet parsed.

/**
 * Reads an unsigned integer with most significant bits first.
 *
 * @param binary string $input     Must be at least $num_bytes-long.
 * @param int           $num_bytes Number of parsed bytes.
 * @return int                     Value.
 */
function read_big_endian( $input, $num_bytes ) {
  if ( $num_bytes == 1 ) {
    return unpack( 'C', $input ) [1];
  } else if ( $num_bytes == 2 ) {
    return unpack( 'n', $input ) [1];
  } else if ( $num_bytes == 3 ) {
    $bytes = unpack( 'C3', $input );
    return ( $bytes[1] << 16 ) | ( $bytes[2] << 8 ) | $bytes[3];
  } else { // $num_bytes is 4
    // This might fail to read unsigned values >= 2^31 on 32-bit systems.
    // See https://www.php.net/manual/en/function.unpack.php#106041
    return unpack( 'N', $input ) [1];
  }
}

/**
 * Reads bytes and advances the stream position by the same count.
 *
 * @param stream               $handle    Bytes will be read from this resource.
 * @param int                  $num_bytes Number of bytes read. Must be greater than 0.
 * @return binary string|false            The raw bytes or false on failure.
 */
function read( $handle, $num_bytes ) {
  $data = fread( $handle, $num_bytes );
  return ( $data !== false && strlen( $data ) >= $num_bytes ) ? $data : false;
}

/**
 * Advances the stream position by the given offset.
 *
 * @param stream $handle    Bytes will be skipped from this resource.
 * @param int    $num_bytes Number of skipped bytes. Can be 0.
 * @return bool             True on success or false on failure.
 */
// Skips 'num_bytes' from the 'stream'. 'num_bytes' can be zero.
function skip( $handle, $num_bytes ) {
  return ( fseek( $handle, $num_bytes, SEEK_CUR ) == 0 );
}

//------------------------------------------------------------------------------
// Features are parsed into temporary property associations.

class Tile { // Tile item id <-> parent item id associations.
  public $tile_item_id;
  public $parent_item_id;
}

class Prop { // Property index <-> item id associations.
  public $property_index;
  public $item_id;
}

class Dim_Prop { // Property <-> features associations.
  public $property_index;
  public $width;
  public $height;
}

class Chan_Prop { // Property <-> features associations.
  public $property_index;
  public $bit_depth;
  public $num_channels;
}

class Features {
  public $has_primary_item = false; // True if "pitm" was parsed.
  public $has_alpha = false; // True if an alpha "auxC" was parsed.
  public $primary_item_id;
  public $primary_item_features = array( // Deduced from the data below.
    'width'        => UNDEFINED, // In number of pixels.
    'height'       => UNDEFINED, // Ignores mirror and rotation.
    'bit_depth'    => UNDEFINED, // Likely 8, 10 or 12 bits per channel per pixel.
    'num_channels' => UNDEFINED  // Likely 1, 2, 3 or 4 channels:
                                          //   (1 monochrome or 3 colors) + (0 or 1 alpha)
  );

  public $tiles = array(); // Tile[]
  public $props = array(); // Prop[]
  public $dim_props = array(); // Dim_Prop[]
  public $chan_props = array(); // Chan_Prop[]

  /**
   * Binds the width, height, bit depth and number of channels from stored internal features.
   *
   * @param int     $target_item_id Id of the item whose features will be bound.
   * @param int     $tile_depth     Maximum recursion to search within tile-parent relations.
   * @return Status                 FOUND on success or NOT_FOUND on failure.
   */
  private function get_item_features( $target_item_id, $tile_depth ) {
    foreach ( $this->props as $prop ) {
      if ( $prop->item_id != $target_item_id ) {
        continue;
      }

      // Retrieve the width and height of the primary item if not already done.
      if ( $target_item_id == $this->primary_item_id &&
           ( $this->primary_item_features['width'] == UNDEFINED ||
             $this->primary_item_features['height'] == UNDEFINED ) ) {
        foreach ( $this->dim_props as $dim_prop ) {
          if ( $dim_prop->property_index != $prop->property_index ) {
            continue;
          }
          $this->primary_item_features['width']  = $dim_prop->width;
          $this->primary_item_features['height'] = $dim_prop->height;
          if ( $this->primary_item_features['bit_depth'] != UNDEFINED &&
               $this->primary_item_features['num_channels'] != UNDEFINED ) {
            return FOUND;
          }
          break;
        }
      }
      // Retrieve the bit depth and number of channels of the target item if not
      // already done.
      if ( $this->primary_item_features['bit_depth'] == UNDEFINED ||
           $this->primary_item_features['num_channels'] == UNDEFINED ) {
        foreach ( $this->chan_props as $chan_prop ) {
          if ( $chan_prop->property_index != $prop->property_index ) {
            continue;
          }
          $this->primary_item_features['bit_depth']    = $chan_prop->bit_depth;
          $this->primary_item_features['num_channels'] = $chan_prop->num_channels;
          if ( $this->primary_item_features['width'] != UNDEFINED &&
              $this->primary_item_features['height'] != UNDEFINED ) {
            return FOUND;
          }
          break;
        }
      }
    }

    // Check for the bit_depth and num_channels in a tile if not yet found.
    if ( $tile_depth < 3 ) {
      foreach ( $this->tiles as $tile ) {
        if ( $tile->parent_item_id != $target_item_id ) {
          continue;
        }
        $status = $this->get_item_features( $tile->tile_item_id, $tile_depth + 1 );
        if ( $status != NOT_FOUND ) {
          return $status;
        }
      }
    }
    return NOT_FOUND;
  }

  /**
   * Finds the width, height, bit depth and number of channels of the primary item.
   *
   * @return Status FOUND on success or NOT_FOUND on failure.
   */
  public function get_primary_item_features() {
    // Nothing to do without the primary item ID.
    if ( !$this->has_primary_item ) {
      return NOT_FOUND;
    }
    // Early exit.
    if ( empty( $this->dim_props ) || empty( $this->chan_props ) ) {
      return NOT_FOUND;
    }
    $status = $this->get_item_features( $this->primary_item_id, /*tile_depth=*/ 0 );
    if ( $status != FOUND ) {
      return $status;
    }

    // "auxC" is parsed before the "ipma" properties so it is known now, if any.
    if ( $this->has_alpha ) {
      ++$this->primary_item_features['num_channels'];
    }
    return FOUND;
  }
}

//------------------------------------------------------------------------------

class Box {
  public $size; // In bytes.
  public $type; // Four characters.
  public $version; // 0 or actual version if this is a full box.
  public $flags; // 0 or actual value if this is a full box.
  public $content_size; // 'size' minus the header size.

  /**
   * Reads the box header.
   *
   * @param stream  $handle              The resource the header will be parsed from.
   * @param int     $num_parsed_boxes    The total number of parsed boxes. Prevents timeouts.
   * @param int     $num_remaining_bytes The number of bytes that should be available from the resource.
   * @return Status                      FOUND on success or an error on failure.
   */
  public function parse( $handle, &$num_parsed_boxes, $num_remaining_bytes = MAX_SIZE ) {
    // See ISO/IEC 14496-12:2012(E) 4.2
    $header_size = 8; // box 32b size + 32b type (at least)
    if ( $header_size > $num_remaining_bytes ) {
      return INVALID;
    }
    if ( !( $data = read( $handle, 8 ) ) ) {
      return TRUNCATED;
    }
    $this->size = read_big_endian( $data, 4 );
    $this->type = substr( $data, 4, 4 );
    // 'box->size==1' means 64-bit size should be read after the box type.
    // 'box->size==0' means this box extends to all remaining bytes.
    if ( $this->size == 1 ) {
      $header_size += 8;
      if ( $header_size > $num_remaining_bytes ) {
        return INVALID;
      }
      if ( !( $data = read( $handle, 8 ) ) ) {
        return TRUNCATED;
      }
      // Stop the parsing if any box has a size greater than 4GB.
      if ( read_big_endian( $data, 4 ) != 0 ) {
        return ABORTED;
      }
      // Read the 32 least-significant bits.
      $this->size = read_big_endian( substr( $data, 4, 4 ), 4 );
    } else if ( $this->size == 0 ) {
      $this->size = $num_remaining_bytes;
    }
    if ( $this->size < $header_size ) {
      return INVALID;
    }
    if ( $this->size > $num_remaining_bytes ) {
      return INVALID;
    }

    $has_fullbox_header = $this->type == 'meta' || $this->type == 'pitm' ||
                          $this->type == 'ipma' || $this->type == 'ispe' ||
                          $this->type == 'pixi' || $this->type == 'iref' ||
                          $this->type == 'auxC';
    if ( $has_fullbox_header ) {
      $header_size += 4;
    }
    if ( $this->size < $header_size ) {
      return INVALID;
    }
    $this->content_size = $this->size - $header_size;
    // Avoid timeouts. The maximum number of parsed boxes is arbitrary.
    ++$num_parsed_boxes;
    if ( $num_parsed_boxes >= MAX_NUM_BOXES ) {
      return ABORTED;
    }

    $this->version = 0;
    $this->flags   = 0;
    if ( $has_fullbox_header ) {
      if ( !( $data = read( $handle, 4 ) ) ) {
        return TRUNCATED;
      }
      $this->version = read_big_endian( $data, 1 );
      $this->flags   = read_big_endian( substr( $data, 1, 3 ), 3 );
      // See AV1 Image File Format (AVIF) 8.1
      // at https://aomediacodec.github.io/av1-avif/#avif-boxes (available when
      // https://github.com/AOMediaCodec/av1-avif/pull/170 is merged).
      $is_parsable = ( $this->type == 'meta' && $this->version <= 0 ) ||
                     ( $this->type == 'pitm' && $this->version <= 1 ) ||
                     ( $this->type == 'ipma' && $this->version <= 1 ) ||
                     ( $this->type == 'ispe' && $this->version <= 0 ) ||
                     ( $this->type == 'pixi' && $this->version <= 0 ) ||
                     ( $this->type == 'iref' && $this->version <= 1 ) ||
                     ( $this->type == 'auxC' && $this->version <= 0 );
      // Instead of considering this file as invalid, skip unparsable boxes.
      if ( !$is_parsable ) {
        $this->type = 'unknownversion';
      }
    }
    // print_r( $this ); // Uncomment to print all boxes.
    return FOUND;
  }
}

//------------------------------------------------------------------------------

class Parser {
  private $handle; // Input stream.
  private $num_parsed_boxes = 0;
  private $data_was_skipped = false;
  public $features;

  function __construct( $handle ) {
    $this->handle   = $handle;
    $this->features = new Features();
  }

  /**
   * Parses an "ipco" box.
   *
   * "ispe" is used for width and height, "pixi" and "av1C" are used for bit depth
   * and number of channels, and "auxC" is used for alpha.
   *
   * @param stream  $handle              The resource the box will be parsed from.
   * @param int     $num_remaining_bytes The number of bytes that should be available from the resource.
   * @return Status                      FOUND on success or an error on failure.
   */
  private function parse_ipco( $num_remaining_bytes ) {
    $box_index = 1; // 1-based index. Used for iterating over properties.
    do {
      $box    = new Box();
      $status = $box->parse( $this->handle, $this->num_parsed_boxes, $num_remaining_bytes );
      if ( $status != FOUND ) {
        return $status;
      }

      if ( $box->type == 'ispe' ) {
        // See ISO/IEC 23008-12:2017(E) 6.5.3.2
        if ( $box->content_size < 8 ) {
          return INVALID;
        }
        if ( !( $data = read( $this->handle, 8 ) ) ) {
          return TRUNCATED;
        }
        $width  = read_big_endian( substr( $data, 0, 4 ), 4 );
        $height = read_big_endian( substr( $data, 4, 4 ), 4 );
        if ( $width == 0 || $height == 0 ) {
          return INVALID;
        }
        if ( count( $this->features->dim_props ) <= MAX_FEATURES &&
             $box_index <= MAX_VALUE ) {
          $dim_prop_count = count( $this->features->dim_props );
          $this->features->dim_props[$dim_prop_count]                 = new Dim_Prop();
          $this->features->dim_props[$dim_prop_count]->property_index = $box_index;
          $this->features->dim_props[$dim_prop_count]->width          = $width;
          $this->features->dim_props[$dim_prop_count]->height         = $height;
        } else {
          $this->data_was_skipped = true;
        }
        if ( !skip( $this->handle, $box->content_size - 8 ) ) {
          return TRUNCATED;
        }
      } else if ( $box->type == 'pixi' ) {
        // See ISO/IEC 23008-12:2017(E) 6.5.6.2
        if ( $box->content_size < 1 ) {
          return INVALID;
        }
        if ( !( $data = read( $this->handle, 1 ) ) ) {
          return TRUNCATED;
        }
        $num_channels = read_big_endian( $data, 1 );
        if ( $num_channels < 1 ) {
          return INVALID;
        }
        if ( $box->content_size < 1 + $num_channels ) {
          return INVALID;
        }
        if ( !( $data = read( $this->handle, 1 ) ) ) {
          return TRUNCATED;
        }
        $bit_depth = read_big_endian( $data, 1 );
        if ( $bit_depth < 1 ) {
          return INVALID;
        }
        for ( $i = 1; $i < $num_channels; ++$i ) {
          if ( !( $data = read( $this->handle, 1 ) ) ) {
            return TRUNCATED;
          }
          // Bit depth should be the same for all channels.
          if ( read_big_endian( $data, 1 ) != $bit_depth ) {
            return INVALID;
          }
          if ( $i > 32 ) {
            return ABORTED; // Be reasonable.
          }
        }
        if ( count( $this->features->chan_props ) <= MAX_FEATURES &&
             $box_index <= MAX_VALUE && $bit_depth <= MAX_VALUE &&
             $num_channels <= MAX_VALUE ) {
          $chan_prop_count = count( $this->features->chan_props );
          $this->features->chan_props[$chan_prop_count]                 = new Chan_Prop();
          $this->features->chan_props[$chan_prop_count]->property_index = $box_index;
          $this->features->chan_props[$chan_prop_count]->bit_depth      = $bit_depth;
          $this->features->chan_props[$chan_prop_count]->num_channels   = $num_channels;
        } else {
          $this->data_was_skipped = true;
        }
        if ( !skip( $this->handle, $box->content_size - ( 1 + $num_channels ) ) ) {
          return TRUNCATED;
        }
      } else if ( $box->type == 'av1C' ) {
        // See AV1 Codec ISO Media File Format Binding 2.3.1
        // at https://aomediacodec.github.io/av1-isobmff/#av1c
        // Only parse the necessary third byte. Assume that the others are valid.
        if ( $box->content_size < 3 ) {
          return INVALID;
        }
        if ( !( $data = read( $this->handle, 3 ) ) ) {
          return TRUNCATED;
        }
        $byte          = read_big_endian( substr( $data, 2, 1 ), 1 );
        $high_bitdepth = ( $byte & 0x40 ) != 0;
        $twelve_bit    = ( $byte & 0x20 ) != 0;
        $monochrome    = ( $byte & 0x10 ) != 0;
        if ( $twelve_bit && !$high_bitdepth ) {
            return INVALID;
        }
        if ( count( $this->features->chan_props ) <= MAX_FEATURES &&
             $box_index <= MAX_VALUE ) {
          $chan_prop_count = count( $this->features->chan_props );
          $this->features->chan_props[$chan_prop_count]                 = new Chan_Prop();
          $this->features->chan_props[$chan_prop_count]->property_index = $box_index;
          $this->features->chan_props[$chan_prop_count]->bit_depth      =
              $high_bitdepth ? $twelve_bit ? 12 : 10 : 8;
          $this->features->chan_props[$chan_prop_count]->num_channels   = $monochrome ? 1 : 3;
        } else {
          $this->data_was_skipped = true;
        }
        if ( !skip( $this->handle, $box->content_size - 3 ) ) {
          return TRUNCATED;
        }
      } else if ( $box->type == 'auxC' ) {
        // See AV1 Image File Format (AVIF) 4
        // at https://aomediacodec.github.io/av1-avif/#auxiliary-images
        $kAlphaStr       = "urn:mpeg:mpegB:cicp:systems:auxiliary:alpha\0";
        $kAlphaStrLength = 44; // Includes terminating character.
        if ( $box->content_size >= $kAlphaStrLength ) {
          if ( !( $data = read( $this->handle, $kAlphaStrLength ) ) ) {
            return TRUNCATED;
          }
          if ( substr( $data, 0, $kAlphaStrLength ) == $kAlphaStr ) {
            // Note: It is unlikely but it is possible that this alpha plane does
            //       not belong to the primary item or a tile. Ignore this issue.
            $this->features->has_alpha = true;
          }
          if ( !skip( $this->handle, $box->content_size - $kAlphaStrLength ) ) {
            return TRUNCATED;
          }
        } else {
          if ( !skip( $this->handle, $box->content_size ) ) {
            return TRUNCATED;
          }
        }
      } else {
        if ( !skip( $this->handle, $box->content_size ) ) {
          return TRUNCATED;
        }
      }
      ++$box_index;
      $num_remaining_bytes -= $box->size;
    } while ( $num_remaining_bytes > 0 );
    return NOT_FOUND;
  }

  /**
   * Parses an "iprp" box.
   *
   * The "ipco" box contain the properties which are linked to items by the "ipma" box.
   *
   * @param stream  $handle              The resource the box will be parsed from.
   * @param int     $num_remaining_bytes The number of bytes that should be available from the resource.
   * @return Status                      FOUND on success or an error on failure.
   */
  private function parse_iprp( $num_remaining_bytes ) {
    do {
      $box    = new Box();
      $status = $box->parse( $this->handle, $this->num_parsed_boxes, $num_remaining_bytes );
      if ( $status != FOUND ) {
        return $status;
      }

      if ( $box->type == 'ipco' ) {
        $status = $this->parse_ipco( $box->content_size );
        if ( $status != NOT_FOUND ) {
          return $status;
        }
      } else if ( $box->type == 'ipma' ) {
        // See ISO/IEC 23008-12:2017(E) 9.3.2
        $num_read_bytes = 4;
        if ( $box->content_size < $num_read_bytes ) {
          return INVALID;
        }
        if ( !( $data = read( $this->handle, $num_read_bytes ) ) ) {
          return TRUNCATED;
        }
        $entry_count        = read_big_endian( $data, 4 );
        $id_num_bytes       = ( $box->version < 1 ) ? 2 : 4;
        $index_num_bytes    = ( $box->flags & 1 ) ? 2 : 1;
        $essential_bit_mask = ( $box->flags & 1 ) ? 0x8000 : 0x80;

        for ( $entry = 0; $entry < $entry_count; ++$entry ) {
          if ( $entry >= MAX_PROPS ||
               count( $this->features->props ) >= MAX_PROPS ) {
            $this->data_was_skipped = true;
            break;
          }
          $num_read_bytes += $id_num_bytes + 1;
          if ( $box->content_size < $num_read_bytes ) {
            return INVALID;
          }
          if ( !( $data = read( $this->handle, $id_num_bytes + 1 ) ) ) {
            return TRUNCATED;
          }
          $item_id           = read_big_endian(
              substr( $data, 0, $id_num_bytes ), $id_num_bytes );
          $association_count = read_big_endian(
              substr( $data, $id_num_bytes, 1 ), 1 );

          for ( $property = 0; $property < $association_count; ++$property ) {
            if ( $property >= MAX_PROPS ||
                 count( $this->features->props ) >= MAX_PROPS ) {
              $this->data_was_skipped = true;
              break;
            }
            $num_read_bytes += $index_num_bytes;
            if ( $box->content_size < $num_read_bytes ) {
              return INVALID;
            }
            if ( !( $data = read( $this->handle, $index_num_bytes ) ) ) {
              return TRUNCATED;
            }
            $value          = read_big_endian( $data, $index_num_bytes );
            // $essential = ($value & $essential_bit_mask);  // Unused.
            $property_index = ( $value & ~$essential_bit_mask );
            if ( $property_index <= MAX_VALUE && $item_id <= MAX_VALUE ) {
              $prop_count = count( $this->features->props );
              $this->features->props[$prop_count]                 = new Prop();
              $this->features->props[$prop_count]->property_index = $property_index;
              $this->features->props[$prop_count]->item_id        = $item_id;
            } else {
              $this->data_was_skipped = true;
            }
          }
          if ( $property < $association_count ) {
            break; // Do not read garbage.
          }
        }

        // If all features are available now, do not look further.
        $status = $this->features->get_primary_item_features();
        if ( $status != NOT_FOUND ) {
          return $status;
        }

        // Mostly if 'data_was_skipped'.
        if ( !skip( $this->handle, $box->content_size - $num_read_bytes ) ) {
          return TRUNCATED;
        }
      } else {
        if ( !skip( $this->handle, $box->content_size ) ) {
          return TRUNCATED;
        }
      }
      $num_remaining_bytes -= $box->size;
    } while ( $num_remaining_bytes > 0 );
    return NOT_FOUND;
  }

  /**
   * Parses an "iref" box.
   *
   * The "dimg" boxes contain links between tiles and their parent items, which
   * can be used to infer bit depth and number of channels for the primary item
   * when the latter does not have these properties.
   *
   * @param stream  $handle              The resource the box will be parsed from.
   * @param int     $num_remaining_bytes The number of bytes that should be available from the resource.
   * @return Status                      FOUND on success or an error on failure.
   */
  private function parse_iref( $num_remaining_bytes ) {
    do {
      $box    = new Box();
      $status = $box->parse( $this->handle, $this->num_parsed_boxes, $num_remaining_bytes );
      if ( $status != FOUND ) {
        return $status;
      }

      if ( $box->type == 'dimg' ) {
        // See ISO/IEC 14496-12:2015(E) 8.11.12.2
        $num_bytes_per_id = ( $box->version == 0 ) ? 2 : 4;
        $num_read_bytes   = $num_bytes_per_id + 2;
        if ( $box->content_size < $num_read_bytes ) {
          return INVALID;
        }
        if ( !( $data = read( $this->handle, $num_read_bytes ) ) ) {
          return TRUNCATED;
        }
        $from_item_id    = read_big_endian( $data, $num_bytes_per_id );
        $reference_count = read_big_endian( substr( $data, $num_bytes_per_id, 2 ), 2 );

        for ( $i = 0; $i < $reference_count; ++$i ) {
          if ( $i >= MAX_TILES ) {
            $this->data_was_skipped = true;
            break;
          }
          $num_read_bytes += $num_bytes_per_id;
          if ( $box->content_size < $num_read_bytes ) {
            return INVALID;
          }
          if ( !( $data = read( $this->handle, $num_bytes_per_id ) ) ) {
            return TRUNCATED;
          }
          $to_item_id = read_big_endian( $data, $num_bytes_per_id );
          $tile_count = count( $this->features->tiles );
          if ( $from_item_id <= MAX_VALUE && $to_item_id <= MAX_VALUE &&
               $tile_count < MAX_TILES ) {
            $this->features->tiles[$tile_count]                 = new Tile();
            $this->features->tiles[$tile_count]->tile_item_id   = $to_item_id;
            $this->features->tiles[$tile_count]->parent_item_id = $from_item_id;
          } else {
            $this->data_was_skipped = true;
          }
        }

        // If all features are available now, do not look further.
        $status = $this->features->get_primary_item_features();
        if ( $status != NOT_FOUND ) {
          return $status;
        }

        // Mostly if 'data_was_skipped'.
        if ( !skip( $this->handle, $box->content_size - $num_read_bytes ) ) {
          return TRUNCATED;
        }
      } else {
        if ( !skip( $this->handle, $box->content_size ) ) {
          return TRUNCATED;
        }
      }
      $num_remaining_bytes -= $box->size;
    } while ( $num_remaining_bytes > 0 );
    return NOT_FOUND;
  }

  /**
   * Parses a "meta" box.
   *
   * It looks for the primary item ID in the "pitm" box and recurses into other boxes
   * to find its features.
   *
   * @param stream  $handle              The resource the box will be parsed from.
   * @param int     $num_remaining_bytes The number of bytes that should be available from the resource.
   * @return Status                      FOUND on success or an error on failure.
   */
  private function parse_meta( $num_remaining_bytes ) {
    do {
      $box    = new Box();
      $status = $box->parse( $this->handle, $this->num_parsed_boxes, $num_remaining_bytes );
      if ( $status != FOUND ) {
        return $status;
      }

      if ( $box->type == 'pitm' ) {
        // See ISO/IEC 14496-12:2015(E) 8.11.4.2
        $num_bytes_per_id = ( $box->version == 0 ) ? 2 : 4;
        if ( $num_bytes_per_id > $num_remaining_bytes ) {
          return INVALID;
        }
        if ( !( $data = read( $this->handle, $num_bytes_per_id ) ) ) {
          return TRUNCATED;
        }
        $primary_item_id = read_big_endian( $data, $num_bytes_per_id );
        if ( $primary_item_id > MAX_VALUE ) {
          return ABORTED;
        }
        $this->features->has_primary_item = true;
        $this->features->primary_item_id  = $primary_item_id;
        if ( !skip( $this->handle, $box->content_size - $num_bytes_per_id ) ) {
          return TRUNCATED;
        }
      } else if ( $box->type == 'iprp' ) {
        $status = $this->parse_iprp( $box->content_size );
        if ( $status != NOT_FOUND ) {
          return $status;
        }
      } else if ( $box->type == 'iref' ) {
        $status = $this->parse_iref( $box->content_size );
        if ( $status != NOT_FOUND ) {
          return $status;
        }
      } else {
        if ( !skip( $this->handle, $box->content_size ) ) {
          return TRUNCATED;
        }
      }
      $num_remaining_bytes -= $box->size;
    } while ( $num_remaining_bytes != 0 );
    // According to ISO/IEC 14496-12:2012(E) 8.11.1.1 there is at most one "meta".
    return INVALID;
  }

  /**
   * Parses a file stream.
   *
   * The file type is checked through the "ftyp" box.
   *
   * @return bool True if the input stream is an AVIF bitstream or false.
   */
  public function parse_ftyp() {
    $box    = new Box();
    $status = $box->parse( $this->handle, $this->num_parsed_boxes );
    if ( $status != FOUND ) {
      return false;
    }

    if ( $box->type != 'ftyp' ) {
      return false;
    }
    // Iterate over brands. See ISO/IEC 14496-12:2012(E) 4.3.1
    if ( $box->content_size < 8 ) {
      return false;
    }
    for ( $i = 0; $i + 4 <= $box->content_size; $i += 4 ) {
      if ( !( $data = read( $this->handle, 4 ) ) ) {
        return false;
      }
      if ( $i == 4 ) {
        continue; // Skip minor_version.
      }
      if ( substr( $data, 0, 4 ) == 'avif' || substr( $data, 0, 4 ) == 'avis' ) {
        return skip( $this->handle, $box->content_size - ( $i + 4 ) );
      }
      if ( $i > 32 * 4 ) {
        return false; // Be reasonable.
      }

    }
    return false; // No AVIF brand no good.
  }

  /**
   * Parses a file stream.
   *
   * Features are extracted from the "meta" box.
   *
   * @return bool True if the main features of the primary item were parsed or false.
   */
  public function parse_file() {
    $box = new Box();
    while ( $box->parse( $this->handle, $this->num_parsed_boxes ) == FOUND ) {
      if ( $box->type === 'meta' ) {
        if ( $this->parse_meta( $box->content_size ) != FOUND ) {
          return false;
        }
        return true;
      }
      if ( !skip( $this->handle, $box->content_size ) ) {
        return false;
      }
    }
    return false; // No "meta" no good.
  }
}

Edit Rename Chmod Delete

FILE FOLDER

Name	Size	Permission
ID3	---	0755
IXR	---	0755
PHPMailer	---	0755
Requests	---	0755
SimplePie	---	0755
Text	---	0755
abilities-api	---	0755
assets	---	0755
block-bindings	---	0755
block-patterns	---	0755
block-supports	---	0755
blocks	---	0755
certificates	---	0755
css	---	0755
customize	---	0755
fonts	---	0755
html-api	---	0755
images	---	0755
interactivity-api	---	0755
js	---	0755
l10n	---	0755
php-compat	---	0755
pomo	---	0755
rest-api	---	0755
sitemaps	---	0755
sodium_compat	---	0755
style-engine	---	0755
theme-compat	---	0755
widgets	---	0755
abilities-api.php	24369 bytes	0644
abilities.php	7983 bytes	0644
admin-bar.php	36966 bytes	0644
atomlib.php	12181 bytes	0644
author-template.php	19391 bytes	0644
block-bindings.php	7526 bytes	0644
block-editor.php	29282 bytes	0644
block-i18n.json	316 bytes	0644
block-patterns.php	13213 bytes	0644
block-template-utils.php	62484 bytes	0644
block-template.php	15359 bytes	0644
blocks.php	114739 bytes	0644
bookmark-template.php	12768 bytes	0644
bookmark.php	15427 bytes	0644
cache-compat.php	10078 bytes	0644
cache.php	13486 bytes	0644
canonical.php	34645 bytes	0644
capabilities.php	43652 bytes	0644
category-template.php	57045 bytes	0644
category.php	12829 bytes	0644
class-IXR.php	2616 bytes	0644
class-avif-info.php	29615 bytes	0644
class-feed.php	539 bytes	0644
class-http.php	367 bytes	0644
class-json.php	43676 bytes	0644
class-oembed.php	401 bytes	0644
class-phpass.php	6771 bytes	0644
class-phpmailer.php	664 bytes	0644
class-pop3.php	21121 bytes	0644
class-requests.php	2237 bytes	0644
class-simplepie.php	453 bytes	0644
class-smtp.php	457 bytes	0644
class-snoopy.php	37715 bytes	0644
class-walker-category-dropdown.php	2469 bytes	0644
class-walker-category.php	8477 bytes	0644
class-walker-comment.php	14221 bytes	0644
class-walker-nav-menu.php	12044 bytes	0644
class-walker-page-dropdown.php	2710 bytes	0644
class-walker-page.php	7612 bytes	0644
class-wp-admin-bar.php	17874 bytes	0644
class-wp-ajax-response.php	5266 bytes	0644
class-wp-application-passwords.php	17099 bytes	0644
class-wp-block-bindings-registry.php	8482 bytes	0644
class-wp-block-bindings-source.php	2992 bytes	0644
class-wp-block-editor-context.php	1350 bytes	0644
class-wp-block-list.php	4713 bytes	0644
class-wp-block-metadata-registry.php	11895 bytes	0644
class-wp-block-parser-block.php	2555 bytes	0644
class-wp-block-parser-frame.php	2017 bytes	0644
class-wp-block-parser.php	11516 bytes	0644
class-wp-block-pattern-categories-registry.php	5450 bytes	0644
class-wp-block-patterns-registry.php	11253 bytes	0644
class-wp-block-processor.php	69959 bytes	0644
class-wp-block-styles-registry.php	6497 bytes	0644
class-wp-block-supports.php	5626 bytes	0644
class-wp-block-template.php	2033 bytes	0644
class-wp-block-templates-registry.php	7193 bytes	0644
class-wp-block-type-registry.php	5030 bytes	0644
class-wp-block-type.php	17265 bytes	0644
class-wp-block.php	24812 bytes	0644
class-wp-classic-to-block-menu-converter.php	4070 bytes	0644
class-wp-comment-query.php	48804 bytes	0644
class-wp-comment.php	9437 bytes	0644
class-wp-customize-control.php	26119 bytes	0644
class-wp-customize-manager.php	203139 bytes	0644
class-wp-customize-nav-menus.php	58013 bytes	0644
class-wp-customize-panel.php	10710 bytes	0644
class-wp-customize-section.php	11209 bytes	0644
class-wp-customize-setting.php	29962 bytes	0644
class-wp-customize-widgets.php	72607 bytes	0644
class-wp-date-query.php	36147 bytes	0644
class-wp-dependencies.php	17004 bytes	0644
class-wp-dependency.php	2633 bytes	0644
class-wp-duotone.php	40783 bytes	0644
class-wp-editor.php	72335 bytes	0644
class-wp-embed.php	15931 bytes	0644
class-wp-error.php	7502 bytes	0644
class-wp-exception.php	253 bytes	0644
class-wp-fatal-error-handler.php	8150 bytes	0644
class-wp-feed-cache-transient.php	3304 bytes	0644
class-wp-feed-cache.php	969 bytes	0644
class-wp-hook.php	16674 bytes	0644
class-wp-http-cookie.php	7389 bytes	0644
class-wp-http-curl.php	13261 bytes	0644
class-wp-http-encoding.php	6689 bytes	0644
class-wp-http-ixr-client.php	3506 bytes	0644
class-wp-http-proxy.php	5980 bytes	0644
class-wp-http-requests-hooks.php	2022 bytes	0644
class-wp-http-requests-response.php	4400 bytes	0644
class-wp-http-response.php	2977 bytes	0644
class-wp-http-streams.php	16859 bytes	0644
class-wp-http.php	41570 bytes	0644
class-wp-image-editor-gd.php	20705 bytes	0644
class-wp-image-editor-imagick.php	36977 bytes	0644
class-wp-image-editor.php	17415 bytes	0644
class-wp-list-util.php	7443 bytes	0644
class-wp-locale-switcher.php	6776 bytes	0644
class-wp-locale.php	16883 bytes	0644
class-wp-matchesmapregex.php	1828 bytes	0644
class-wp-meta-query.php	30533 bytes	0644
class-wp-metadata-lazyloader.php	6833 bytes	0644
class-wp-navigation-fallback.php	9193 bytes	0644
class-wp-network-query.php	19887 bytes	0644
class-wp-network.php	12296 bytes	0644
class-wp-object-cache.php	17524 bytes	0644
class-wp-oembed-controller.php	6905 bytes	0644
class-wp-oembed.php	31670 bytes	0644
class-wp-paused-extensions-storage.php	5111 bytes	0644
class-wp-phpmailer.php	4348 bytes	0644
class-wp-plugin-dependencies.php	25315 bytes	0644
class-wp-post-type.php	30680 bytes	0644
class-wp-post.php	6491 bytes	0644
class-wp-query.php	163744 bytes	0644
class-wp-recovery-mode-cookie-service.php	6877 bytes	0644
class-wp-recovery-mode-email-service.php	11183 bytes	0644
class-wp-recovery-mode-key-service.php	4884 bytes	0644
class-wp-recovery-mode-link-service.php	3463 bytes	0644
class-wp-recovery-mode.php	11453 bytes	0644
class-wp-rewrite.php	63687 bytes	0644
class-wp-role.php	2523 bytes	0644
class-wp-roles.php	9394 bytes	0644
class-wp-script-modules.php	32917 bytes	0644
class-wp-scripts.php	34864 bytes	0644
class-wp-session-tokens.php	7319 bytes	0644
class-wp-simplepie-file.php	3552 bytes	0644
class-wp-simplepie-sanitize-kses.php	1910 bytes	0644
class-wp-site-query.php	31655 bytes	0644
class-wp-site.php	7467 bytes	0644
class-wp-speculation-rules.php	7527 bytes	0644
class-wp-styles.php	12843 bytes	0644
class-wp-tax-query.php	19577 bytes	0644
class-wp-taxonomy.php	18559 bytes	0644
class-wp-term-query.php	40953 bytes	0644
class-wp-term.php	5298 bytes	0644
class-wp-text-diff-renderer-inline.php	979 bytes	0644
class-wp-text-diff-renderer-table.php	18880 bytes	0644
class-wp-textdomain-registry.php	10481 bytes	0644
class-wp-theme-json-data.php	1809 bytes	0644
class-wp-theme-json-resolver.php	35738 bytes	0644
class-wp-theme-json-schema.php	7367 bytes	0644
class-wp-theme-json.php	164347 bytes	0644
class-wp-theme.php	65810 bytes	0644
class-wp-token-map.php	28618 bytes	0644
class-wp-url-pattern-prefixer.php	4802 bytes	0644
class-wp-user-meta-session-tokens.php	3011 bytes	0644
class-wp-user-query.php	44166 bytes	0644
class-wp-user-request.php	2305 bytes	0644
class-wp-user.php	23044 bytes	0644
class-wp-walker.php	13322 bytes	0644
class-wp-widget-factory.php	3347 bytes	0644
class-wp-widget.php	18429 bytes	0644
class-wp-xmlrpc-server.php	215447 bytes	0644
class-wp.php	26481 bytes	0644
class-wpdb.php	118627 bytes	0644
class.wp-dependencies.php	373 bytes	0644
class.wp-scripts.php	343 bytes	0644
class.wp-styles.php	338 bytes	0644
comment-template.php	103145 bytes	0644
comment.php	134069 bytes	0644
compat-utf8.php	19554 bytes	0644
compat.php	17830 bytes	0644
cron.php	42988 bytes	0644
date.php	400 bytes	0644
default-constants.php	11365 bytes	0644
default-filters.php	37910 bytes	0644
default-widgets.php	2295 bytes	0644
deprecated.php	192644 bytes	0644
embed-template.php	338 bytes	0644
embed.php	38911 bytes	0644
error-protection.php	4121 bytes	0644
error_log	24654 bytes	0644
feed-atom-comments.php	5504 bytes	0644
feed-atom.php	3121 bytes	0644
feed-rdf.php	2668 bytes	0644
feed-rss.php	1189 bytes	0644
feed-rss2-comments.php	4136 bytes	0644
feed-rss2.php	3799 bytes	0644
feed.php	25189 bytes	0644
fonts.php	9790 bytes	0644
formatting.php	354741 bytes	0644
functions.php	288600 bytes	0644
functions.wp-scripts.php	15311 bytes	0644
functions.wp-styles.php	8641 bytes	0644
general-template.php	173004 bytes	0644
global-styles-and-settings.php	21204 bytes	0644
http.php	25878 bytes	0644
https-detection.php	5857 bytes	0644
https-migration.php	4741 bytes	0644
kses.php	83693 bytes	0644
l10n.php	68797 bytes	0644
link-template.php	160117 bytes	0644
load.php	56510 bytes	0644
locale.php	162 bytes	0644
media-template.php	63197 bytes	0644
media.php	221247 bytes	0644
meta.php	66556 bytes	0644
ms-blogs.php	25845 bytes	0644
ms-default-constants.php	4921 bytes	0644
ms-default-filters.php	6636 bytes	0644
ms-deprecated.php	21759 bytes	0644
ms-files.php	2857 bytes	0644
ms-functions.php	91842 bytes	0644
ms-load.php	19887 bytes	0644
ms-network.php	3782 bytes	0644
ms-settings.php	4204 bytes	0644
ms-site.php	41717 bytes	0644
nav-menu-template.php	25990 bytes	0644
nav-menu.php	44347 bytes	0644
option.php	105035 bytes	0644
pluggable-deprecated.php	6324 bytes	0644
pluggable.php	127457 bytes	0644
plugin.php	36501 bytes	0644
post-formats.php	7102 bytes	0644
post-template.php	68648 bytes	0644
post-thumbnail-template.php	10879 bytes	0644
post.php	296072 bytes	0644
query.php	37095 bytes	0644
registration-functions.php	200 bytes	0644
registration.php	200 bytes	0644
rest-api.php	100654 bytes	0644
revision.php	30741 bytes	0644
rewrite.php	19490 bytes	0644
robots-template.php	5185 bytes	0644
rss-functions.php	255 bytes	0644
rss.php	23203 bytes	0644
script-loader.php	158344 bytes	0644
script-modules.php	9911 bytes	0644
session.php	258 bytes	0644
shortcodes.php	24050 bytes	0644
sitemaps.php	3238 bytes	0644
speculative-loading.php	8600 bytes	0644
spl-autoload-compat.php	441 bytes	0644
style-engine.php	7563 bytes	0644
taxonomy.php	177058 bytes	0644
template-canvas.php	544 bytes	0644
template-loader.php	4267 bytes	0644
template.php	36834 bytes	0644
theme-i18n.json	1730 bytes	0644
theme-previews.php	2910 bytes	0644
theme-templates.php	6238 bytes	0644
theme.json	8921 bytes	0644
theme.php	135008 bytes	0644
update.php	38353 bytes	0644
user.php	178062 bytes	0644
utf8.php	7260 bytes	0644
vars.php	6562 bytes	0644
version.php	1106 bytes	0644
widgets.php	71129 bytes	0644
wp-db.php	445 bytes	0644
wp-diff.php	799 bytes	0644

File Content: class-avif-info.php

File Content: `class-avif-info.php`