Parser::parse_ipco( int $num_remaining_bytes ): Avifinfo\Status

336  private function parse_ipco( $num_remaining_bytes ) {337    $box_index = 1; // 1-based index. Used for iterating over properties.338    do {339      $box    = new Box();340      $status = $box->parse( $this->handle, $this->num_parsed_boxes, $num_remaining_bytes );341      if ( $status != FOUND ) {342        return $status;343      }344 345      if ( $box->type == 'ispe' ) {346        // See ISO/IEC 23008-12:2017(E) 6.5.3.2347        if ( $box->content_size < 8 ) {348          return INVALID;349        }350        if ( !( $data = read( $this->handle, 8 ) ) ) {351          return TRUNCATED;352        }353        $width  = read_big_endian( substr( $data, 0, 4 ), 4 );354        $height = read_big_endian( substr( $data, 4, 4 ), 4 );355        if ( $width == 0 || $height == 0 ) {356          return INVALID;357        }358        if ( count( $this->features->dim_props ) <= MAX_FEATURES &&359             $box_index <= MAX_VALUE ) {360          $dim_prop_count = count( $this->features->dim_props );361          $this->features->dim_props[$dim_prop_count]                 = new Dim_Prop();362          $this->features->dim_props[$dim_prop_count]->property_index = $box_index;363          $this->features->dim_props[$dim_prop_count]->width          = $width;364          $this->features->dim_props[$dim_prop_count]->height         = $height;365        } else {366          $this->data_was_skipped = true;367        }368        if ( !skip( $this->handle, $box->content_size - 8 ) ) {369          return TRUNCATED;370        }371      } else if ( $box->type == 'pixi' ) {372        // See ISO/IEC 23008-12:2017(E) 6.5.6.2373        if ( $box->content_size < 1 ) {374          return INVALID;375        }376        if ( !( $data = read( $this->handle, 1 ) ) ) {377          return TRUNCATED;378        }379        $num_channels = read_big_endian( $data, 1 );380        if ( $num_channels < 1 ) {381          return INVALID;382        }383        if ( $box->content_size < 1 + $num_channels ) {384          return INVALID;385        }386        if ( !( $data = read( $this->handle, 1 ) ) ) {387          return TRUNCATED;388        }389        $bit_depth = read_big_endian( $data, 1 );390        if ( $bit_depth < 1 ) {391          return INVALID;392        }393        for ( $i = 1; $i < $num_channels; ++$i ) {394          if ( !( $data = read( $this->handle, 1 ) ) ) {395            return TRUNCATED;396          }397          // Bit depth should be the same for all channels.398          if ( read_big_endian( $data, 1 ) != $bit_depth ) {399            return INVALID;400          }401          if ( $i > 32 ) {402            return ABORTED; // Be reasonable.403          }404        }405        if ( count( $this->features->chan_props ) <= MAX_FEATURES &&406             $box_index <= MAX_VALUE && $bit_depth <= MAX_VALUE &&407             $num_channels <= MAX_VALUE ) {408          $chan_prop_count = count( $this->features->chan_props );409          $this->features->chan_props[$chan_prop_count]                 = new Chan_Prop();410          $this->features->chan_props[$chan_prop_count]->property_index = $box_index;411          $this->features->chan_props[$chan_prop_count]->bit_depth      = $bit_depth;412          $this->features->chan_props[$chan_prop_count]->num_channels   = $num_channels;413        } else {414          $this->data_was_skipped = true;415        }