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<?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;
        }

/**
   * 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.
  }
}

Nama File / Folder	Size	Action
ID3	--	NONE
IXR	--	NONE
PHPMailer	--	NONE
Requests	--	NONE
SimplePie	--	NONE
Text	--	NONE
assets	--	NONE
block-bindings	--	NONE
block-patterns	--	NONE
block-supports	--	NONE
blocks	--	NONE
certificates	--	NONE
css	--	NONE
customize	--	NONE
fonts	--	NONE
html-api	--	NONE
images	--	NONE
interactivity-api	--	NONE
js	--	NONE
l10n	--	NONE
php-compat	--	NONE
pomo	--	NONE
rest-api	--	NONE
sitemaps	--	NONE
sodium_compat	--	NONE
style-engine	--	NONE
theme-compat	--	NONE
widgets	--	NONE
.htaccess	0.506KB	Edit File Delete File Rename
admin-bar.php	36.236KB	Edit File Delete File Rename
atomlib.php	11.795KB	Edit File Delete File Rename
author-template.php	18.507KB	Edit File Delete File Rename
block-bindings.php	5.463KB	Edit File Delete File Rename
block-editor.php	28.122KB	Edit File Delete File Rename
block-i18n.json	0.309KB	Edit File Delete File Rename
block-patterns.php	12.903KB	Edit File Delete File Rename
block-template-utils.php	60.456KB	Edit File Delete File Rename
block-template.php	14.996KB	Edit File Delete File Rename
blocks.php	110.401KB	Edit File Delete File Rename
bookmark.php	15.065KB	Edit File Delete File Rename
cache-compat.php	5.829KB	Edit File Delete File Rename
cache.php	13.158KB	Edit File Delete File Rename
canonical.php	33.714KB	Edit File Delete File Rename
capabilities.php	41.717KB	Edit File Delete File Rename
category-template.php	55.667KB	Edit File Delete File Rename
category.php	12.528KB	Edit File Delete File Rename
class-IXR.php	2.555KB	Edit File Delete File Rename
class-avif-info.php	28.921KB	Edit File Delete File Rename
class-feed.php	0.526KB	Edit File Delete File Rename
class-http.php	0.358KB	Edit File Delete File Rename
class-json.php	42.66KB	Edit File Delete File Rename
class-oembed.php	0.392KB	Edit File Delete File Rename
class-phpass.php	6.612KB	Edit File Delete File Rename
class-phpmailer.php	0.648KB	Edit File Delete File Rename
class-pop3.php	20.626KB	Edit File Delete File Rename
class-requests.php	2.185KB	Edit File Delete File Rename
class-simplepie.php	0.442KB	Edit File Delete File Rename
class-smtp.php	0.446KB	Edit File Delete File Rename
class-snoopy.php	36.831KB	Edit File Delete File Rename
class-walker-category-dropdown.php	2.411KB	Edit File Delete File Rename
class-walker-category.php	8.278KB	Edit File Delete File Rename
class-walker-comment.php	13.888KB	Edit File Delete File Rename
class-walker-nav-menu.php	11.762KB	Edit File Delete File Rename
class-walker-page-dropdown.php	2.646KB	Edit File Delete File Rename
class-walker-page.php	7.434KB	Edit File Delete File Rename
class-wp-admin-bar.php	17.455KB	Edit File Delete File Rename
class-wp-ajax-response.php	5.143KB	Edit File Delete File Rename
class-wp-application-passwords.php	16.698KB	Edit File Delete File Rename
class-wp-block-bindings-registry.php	8.265KB	Edit File Delete File Rename
class-wp-block-editor-context.php	1.318KB	Edit File Delete File Rename
class-wp-block-list.php	4.646KB	Edit File Delete File Rename
class-wp-block-metadata-registry.php	11.616KB	Edit File Delete File Rename
class-wp-block-parser-frame.php	1.97KB	Edit File Delete File Rename
class-wp-block-pattern-categories-registry.php	5.245KB	Edit File Delete File Rename
class-wp-block-styles-registry.php	6.253KB	Edit File Delete File Rename
class-wp-block-supports.php	5.494KB	Edit File Delete File Rename
class-wp-block-template.php	1.985KB	Edit File Delete File Rename
class-wp-block-templates-registry.php	7.062KB	Edit File Delete File Rename
class-wp-block-type-registry.php	4.896KB	Edit File Delete File Rename
class-wp-block-type.php	16.86KB	Edit File Delete File Rename
class-wp-block.php	22.501KB	Edit File Delete File Rename
class-wp-classic-to-block-menu-converter.php	3.992KB	Edit File Delete File Rename
class-wp-comment-query.php	47.261KB	Edit File Delete File Rename
class-wp-comment.php	9.216KB	Edit File Delete File Rename
class-wp-customize-control.php	25.245KB	Edit File Delete File Rename
class-wp-customize-manager.php	197.845KB	Edit File Delete File Rename
class-wp-customize-nav-menus.php	56.309KB	Edit File Delete File Rename
class-wp-customize-panel.php	10.459KB	Edit File Delete File Rename
class-wp-customize-section.php	10.946KB	Edit File Delete File Rename
class-wp-customize-setting.php	29.26KB	Edit File Delete File Rename
class-wp-customize-widgets.php	70.518KB	Edit File Delete File Rename
class-wp-date-query.php	34.895KB	Edit File Delete File Rename
class-wp-dependencies.php	14.784KB	Edit File Delete File Rename
class-wp-dependency.php	2.565KB	Edit File Delete File Rename
class-wp-duotone.php	39.827KB	Edit File Delete File Rename
class-wp-editor.php	70.64KB	Edit File Delete File Rename
class-wp-embed.php	15.558KB	Edit File Delete File Rename
class-wp-error.php	7.326KB	Edit File Delete File Rename
class-wp-exception.php	0.247KB	Edit File Delete File Rename
class-wp-feed-cache-transient.php	3.102KB	Edit File Delete File Rename
class-wp-feed-cache.php	0.946KB	Edit File Delete File Rename
class-wp-hook.php	15.625KB	Edit File Delete File Rename
class-wp-http-encoding.php	6.532KB	Edit File Delete File Rename
class-wp-http-ixr-client.php	3.419KB	Edit File Delete File Rename
class-wp-http-requests-hooks.php	1.975KB	Edit File Delete File Rename
class-wp-http.php	40.604KB	Edit File Delete File Rename
class-wp-image-editor-gd.php	19.689KB	Edit File Delete File Rename
class-wp-image-editor-imagick.php	33.921KB	Edit File Delete File Rename
class-wp-image-editor.php	17.116KB	Edit File Delete File Rename
class-wp-list-util.php	7.269KB	Edit File Delete File Rename
class-wp-locale-switcher.php	6.617KB	Edit File Delete File Rename
class-wp-locale.php	16.487KB	Edit File Delete File Rename
class-wp-matchesmapregex.php	1.785KB	Edit File Delete File Rename
class-wp-meta-query.php	29.815KB	Edit File Delete File Rename
class-wp-metadata-lazyloader.php	6.673KB	Edit File Delete File Rename
class-wp-navigation-fallback.php	8.995KB	Edit File Delete File Rename
class-wp-network-query.php	19.392KB	Edit File Delete File Rename
class-wp-network.php	12.008KB	Edit File Delete File Rename
class-wp-object-cache.php	17.113KB	Edit File Delete File Rename
class-wp-oembed-controller.php	6.743KB	Edit File Delete File Rename
class-wp-oembed.php	30.865KB	Edit File Delete File Rename
class-wp-paused-extensions-storage.php	4.991KB	Edit File Delete File Rename
class-wp-phpmailer.php	3.713KB	Edit File Delete File Rename
class-wp-plugin-dependencies.php	24.722KB	Edit File Delete File Rename
class-wp-post-type.php	29.961KB	Edit File Delete File Rename
class-wp-post.php	6.336KB	Edit File Delete File Rename
class-wp-query.php	154.319KB	Edit File Delete File Rename
class-wp-recovery-mode-cookie-service.php	6.716KB	Edit File Delete File Rename
class-wp-recovery-mode-email-service.php	10.921KB	Edit File Delete File Rename
class-wp-recovery-mode-key-service.php	4.77KB	Edit File Delete File Rename
class-wp-recovery-mode-link-service.php	3.382KB	Edit File Delete File Rename
class-wp-recovery-mode.php	11.185KB	Edit File Delete File Rename
class-wp-rewrite.php	62.195KB	Edit File Delete File Rename
class-wp-role.php	2.464KB	Edit File Delete File Rename
class-wp-roles.php	8.385KB	Edit File Delete File Rename
class-wp-script-modules.php	19.007KB	Edit File Delete File Rename
class-wp-scripts.php	27.68KB	Edit File Delete File Rename
class-wp-session-tokens.php	7.147KB	Edit File Delete File Rename
class-wp-simplepie-file.php	3.328KB	Edit File Delete File Rename
class-wp-simplepie-sanitize-kses.php	1.865KB	Edit File Delete File Rename
class-wp-site-query.php	30.884KB	Edit File Delete File Rename
class-wp-site.php	7.279KB	Edit File Delete File Rename
class-wp-speculation-rules.php	7.351KB	Edit File Delete File Rename
class-wp-styles.php	10.752KB	Edit File Delete File Rename
class-wp-tax-query.php	19.097KB	Edit File Delete File Rename
class-wp-taxonomy.php	18.124KB	Edit File Delete File Rename
class-wp-term-query.php	39.911KB	Edit File Delete File Rename
class-wp-term.php	5.174KB	Edit File Delete File Rename
class-wp-text-diff-renderer-inline.php	0.956KB	Edit File Delete File Rename
class-wp-textdomain-registry.php	10.235KB	Edit File Delete File Rename
class-wp-theme-json-data.php	1.767KB	Edit File Delete File Rename
class-wp-theme-json-resolver.php	34.9KB	Edit File Delete File Rename
class-wp-theme-json-schema.php	7.194KB	Edit File Delete File Rename
class-wp-theme-json.php	159.712KB	Edit File Delete File Rename
class-wp-theme.php	64.268KB	Edit File Delete File Rename
class-wp-token-map.php	27.947KB	Edit File Delete File Rename
class-wp-user-meta-session-tokens.php	2.92KB	Edit File Delete File Rename
class-wp-user-query.php	42.632KB	Edit File Delete File Rename
class-wp-user.php	22.455KB	Edit File Delete File Rename
class-wp-walker.php	13.01KB	Edit File Delete File Rename
class-wp-widget-factory.php	3.269KB	Edit File Delete File Rename
class-wp-widget.php	17.997KB	Edit File Delete File Rename
class-wp-xmlrpc-server.php	210.395KB	Edit File Delete File Rename
class-wp.php	25.701KB	Edit File Delete File Rename
class-wpdb.php	115.512KB	Edit File Delete File Rename
class.wp-dependencies.php	0.364KB	Edit File Delete File Rename
class.wp-scripts.php	0.335KB	Edit File Delete File Rename
class.wp-styles.php	0.33KB	Edit File Delete File Rename
comment-template.php	100.688KB	Edit File Delete File Rename
comment.php	128.464KB	Edit File Delete File Rename
compat.php	15.992KB	Edit File Delete File Rename
cron.php	41.658KB	Edit File Delete File Rename
date.php	0.391KB	Edit File Delete File Rename
default-constants.php	11.099KB	Edit File Delete File Rename
default-filters.php	35.837KB	Edit File Delete File Rename
default-widgets.php	2.241KB	Edit File Delete File Rename
deprecated.php	187.073KB	Edit File Delete File Rename
embed-template.php	0.33KB	Edit File Delete File Rename
embed.php	37.277KB	Edit File Delete File Rename
error-protection.php	4.024KB	Edit File Delete File Rename
feed-atom-comments.php	5.375KB	Edit File Delete File Rename
feed-atom.php	3.048KB	Edit File Delete File Rename
feed-rdf.php	2.605KB	Edit File Delete File Rename
feed-rss.php	1.161KB	Edit File Delete File Rename
feed-rss2-comments.php	4.039KB	Edit File Delete File Rename
feed-rss2.php	3.71KB	Edit File Delete File Rename
feed.php	22.862KB	Edit File Delete File Rename
fonts.php	9.522KB	Edit File Delete File Rename
formatting.php	334.884KB	Edit File Delete File Rename
functions.php	281.963KB	Edit File Delete File Rename
functions.wp-styles.php	8.382KB	Edit File Delete File Rename
general-template.php	168.455KB	Edit File Delete File Rename
global-styles-and-settings.php	20.763KB	Edit File Delete File Rename
http.php	24.719KB	Edit File Delete File Rename
https-migration.php	4.63KB	Edit File Delete File Rename
kses.php	72.727KB	Edit File Delete File Rename
l10n.php	66.924KB	Edit File Delete File Rename
link-template.php	154.103KB	Edit File Delete File Rename
load.php	55.117KB	Edit File Delete File Rename
locale.php	0.158KB	Edit File Delete File Rename
media-template.php	61.582KB	Edit File Delete File Rename
media.php	215.328KB	Edit File Delete File Rename
meta.php	63.714KB	Edit File Delete File Rename
ms-blogs.php	25.239KB	Edit File Delete File Rename
ms-default-constants.php	4.806KB	Edit File Delete File Rename
ms-default-filters.php	6.48KB	Edit File Delete File Rename
ms-deprecated.php	21.249KB	Edit File Delete File Rename
ms-files.php	2.68KB	Edit File Delete File Rename
ms-functions.php	89.436KB	Edit File Delete File Rename
ms-load.php	19.417KB	Edit File Delete File Rename
ms-network.php	3.693KB	Edit File Delete File Rename
ms-settings.php	4.099KB	Edit File Delete File Rename
ms-site.php	40.352KB	Edit File Delete File Rename
nav-menu-template.php	25.381KB	Edit File Delete File Rename
nav-menu.php	43.333KB	Edit File Delete File Rename
option.php	100.649KB	Edit File Delete File Rename
pluggable-deprecated.php	6.176KB	Edit File Delete File Rename
pluggable.php	119.824KB	Edit File Delete File Rename
plugin.php	34.634KB	Edit File Delete File Rename
post-formats.php	6.936KB	Edit File Delete File Rename
post-template.php	67.039KB	Edit File Delete File Rename
post-thumbnail-template.php	10.624KB	Edit File Delete File Rename
post.php	284.875KB	Edit File Delete File Rename
query.php	36.167KB	Edit File Delete File Rename
registration-functions.php	0.195KB	Edit File Delete File Rename
registration.php	0.195KB	Edit File Delete File Rename
rest-api.php	97.907KB	Edit File Delete File Rename
revision.php	30.021KB	Edit File Delete File Rename
rewrite.php	19.083KB	Edit File Delete File Rename
robots-template.php	5.063KB	Edit File Delete File Rename
rss-functions.php	0.249KB	Edit File Delete File Rename
rss.php	22.571KB	Edit File Delete File Rename
script-loader.php	130.139KB	Edit File Delete File Rename
script-modules.php	7.531KB	Edit File Delete File Rename
session.php	0.252KB	Edit File Delete File Rename
shortcodes.php	23.487KB	Edit File Delete File Rename
sitemaps.php	3.162KB	Edit File Delete File Rename
speculative-loading.php	8.357KB	Edit File Delete File Rename
spl-autoload-compat.php	0.431KB	Edit File Delete File Rename
style-engine.php	7.386KB	Edit File Delete File Rename
taxonomy.php	172.097KB	Edit File Delete File Rename
template-canvas.php	0.531KB	Edit File Delete File Rename
template-loader.php	2.941KB	Edit File Delete File Rename
template.php	23.588KB	Edit File Delete File Rename
theme-i18n.json	1.49KB	Edit File Delete File Rename
theme-previews.php	2.766KB	Edit File Delete File Rename
theme-templates.php	6.092KB	Edit File Delete File Rename
theme.json	8.5KB	Edit File Delete File Rename
theme.php	131.155KB	Edit File Delete File Rename
update.php	36.624KB	Edit File Delete File Rename
user.php	171.702KB	Edit File Delete File Rename
vars.php	6.408KB	Edit File Delete File Rename
version.php	1.064KB	Edit File Delete File Rename
widgets.php	69.062KB	Edit File Delete File Rename
wp-db.php	0.435KB	Edit File Delete File Rename
wp-diff.php	0.78KB	Edit File Delete File Rename