Edit File by line

$status = $this->parse_ipco( $box->content_size );

[500] Fix | Delete

if ( $status != NOT_FOUND ) {

[501] Fix | Delete

return $status;

[502] Fix | Delete

}

[503] Fix | Delete

} else if ( $box->type == 'ipma' ) {

[504] Fix | Delete

// See ISO/IEC 23008-12:2017(E) 9.3.2

[505] Fix | Delete

$num_read_bytes = 4;

[506] Fix | Delete

if ( $box->content_size < $num_read_bytes ) {

[507] Fix | Delete

return INVALID;

[508] Fix | Delete

}

[509] Fix | Delete

if ( !( $data = read( $this->handle, $num_read_bytes ) ) ) {

[510] Fix | Delete

return TRUNCATED;

[511] Fix | Delete

}

[512] Fix | Delete

$entry_count = read_big_endian( $data, 4 );

[513] Fix | Delete

$id_num_bytes = ( $box->version < 1 ) ? 2 : 4;

[514] Fix | Delete

$index_num_bytes = ( $box->flags & 1 ) ? 2 : 1;

[515] Fix | Delete

$essential_bit_mask = ( $box->flags & 1 ) ? 0x8000 : 0x80;

[516] Fix | Delete

[517] Fix | Delete

for ( $entry = 0; $entry < $entry_count; ++$entry ) {

[518] Fix | Delete

if ( $entry >= MAX_PROPS ||

[519] Fix | Delete

count( $this->features->props ) >= MAX_PROPS ) {

[520] Fix | Delete

$this->data_was_skipped = true;

[521] Fix | Delete

break;

[522] Fix | Delete

}

[523] Fix | Delete

$num_read_bytes += $id_num_bytes + 1;

[524] Fix | Delete

if ( $box->content_size < $num_read_bytes ) {

[525] Fix | Delete

return INVALID;

[526] Fix | Delete

}

[527] Fix | Delete

if ( !( $data = read( $this->handle, $id_num_bytes + 1 ) ) ) {

[528] Fix | Delete

return TRUNCATED;

[529] Fix | Delete

}

[530] Fix | Delete

$item_id = read_big_endian(

[531] Fix | Delete

substr( $data, 0, $id_num_bytes ), $id_num_bytes );

[532] Fix | Delete

$association_count = read_big_endian(

[533] Fix | Delete

substr( $data, $id_num_bytes, 1 ), 1 );

[534] Fix | Delete

[535] Fix | Delete

for ( $property = 0; $property < $association_count; ++$property ) {

[536] Fix | Delete

if ( $property >= MAX_PROPS ||

[537] Fix | Delete

count( $this->features->props ) >= MAX_PROPS ) {

[538] Fix | Delete

$this->data_was_skipped = true;

[539] Fix | Delete

break;

[540] Fix | Delete

}

[541] Fix | Delete

$num_read_bytes += $index_num_bytes;

[542] Fix | Delete

if ( $box->content_size < $num_read_bytes ) {

[543] Fix | Delete

return INVALID;

[544] Fix | Delete

}

[545] Fix | Delete

if ( !( $data = read( $this->handle, $index_num_bytes ) ) ) {

[546] Fix | Delete

return TRUNCATED;

[547] Fix | Delete

}

[548] Fix | Delete

$value = read_big_endian( $data, $index_num_bytes );

[549] Fix | Delete

// $essential = ($value & $essential_bit_mask); // Unused.

[550] Fix | Delete

$property_index = ( $value & ~$essential_bit_mask );

[551] Fix | Delete

if ( $property_index <= MAX_VALUE && $item_id <= MAX_VALUE ) {

[552] Fix | Delete

$prop_count = count( $this->features->props );

[553] Fix | Delete

$this->features->props[$prop_count] = new Prop();

[554] Fix | Delete

$this->features->props[$prop_count]->property_index = $property_index;

[555] Fix | Delete

$this->features->props[$prop_count]->item_id = $item_id;

[556] Fix | Delete

} else {

[557] Fix | Delete

$this->data_was_skipped = true;

[558] Fix | Delete

}

[559] Fix | Delete

}

[560] Fix | Delete

if ( $property < $association_count ) {

[561] Fix | Delete

break; // Do not read garbage.

[562] Fix | Delete

}

[563] Fix | Delete

}

[564] Fix | Delete

[565] Fix | Delete

// If all features are available now, do not look further.

[566] Fix | Delete

$status = $this->features->get_primary_item_features();

[567] Fix | Delete

if ( $status != NOT_FOUND ) {

[568] Fix | Delete

return $status;

[569] Fix | Delete

}

[570] Fix | Delete

[571] Fix | Delete

// Mostly if 'data_was_skipped'.

[572] Fix | Delete

if ( !skip( $this->handle, $box->content_size - $num_read_bytes ) ) {

[573] Fix | Delete

return TRUNCATED;

[574] Fix | Delete

}

[575] Fix | Delete

} else {

[576] Fix | Delete

if ( !skip( $this->handle, $box->content_size ) ) {

[577] Fix | Delete

return TRUNCATED;

[578] Fix | Delete

}

[579] Fix | Delete

}

[580] Fix | Delete

$num_remaining_bytes -= $box->size;

[581] Fix | Delete

} while ( $num_remaining_bytes > 0 );

[582] Fix | Delete

return NOT_FOUND;

[583] Fix | Delete

}

[584] Fix | Delete

[585] Fix | Delete

/**

[586] Fix | Delete

* Parses an "iref" box.

[587] Fix | Delete

[588] Fix | Delete

* The "dimg" boxes contain links between tiles and their parent items, which

[589] Fix | Delete

* can be used to infer bit depth and number of channels for the primary item

[590] Fix | Delete

* when the latter does not have these properties.

[591] Fix | Delete

[592] Fix | Delete

* @param stream $handle The resource the box will be parsed from.

[593] Fix | Delete

* @param int $num_remaining_bytes The number of bytes that should be available from the resource.

[594] Fix | Delete

* @return Status FOUND on success or an error on failure.

[595] Fix | Delete

[596] Fix | Delete

private function parse_iref( $num_remaining_bytes ) {

[597] Fix | Delete

do {

[598] Fix | Delete

$box = new Box();

[599] Fix | Delete

$status = $box->parse( $this->handle, $this->num_parsed_boxes, $num_remaining_bytes );

[600] Fix | Delete

if ( $status != FOUND ) {

[601] Fix | Delete

return $status;

[602] Fix | Delete

}

[603] Fix | Delete

[604] Fix | Delete

if ( $box->type == 'dimg' ) {

[605] Fix | Delete

// See ISO/IEC 14496-12:2015(E) 8.11.12.2

[606] Fix | Delete

$num_bytes_per_id = ( $box->version == 0 ) ? 2 : 4;

[607] Fix | Delete

$num_read_bytes = $num_bytes_per_id + 2;

[608] Fix | Delete

if ( $box->content_size < $num_read_bytes ) {

[609] Fix | Delete

return INVALID;

[610] Fix | Delete

}

[611] Fix | Delete

if ( !( $data = read( $this->handle, $num_read_bytes ) ) ) {

[612] Fix | Delete

return TRUNCATED;

[613] Fix | Delete

}

[614] Fix | Delete

$from_item_id = read_big_endian( $data, $num_bytes_per_id );

[615] Fix | Delete

$reference_count = read_big_endian( substr( $data, $num_bytes_per_id, 2 ), 2 );

[616] Fix | Delete

[617] Fix | Delete

for ( $i = 0; $i < $reference_count; ++$i ) {

[618] Fix | Delete

if ( $i >= MAX_TILES ) {

[619] Fix | Delete

$this->data_was_skipped = true;

[620] Fix | Delete

break;

[621] Fix | Delete

}

[622] Fix | Delete

$num_read_bytes += $num_bytes_per_id;

[623] Fix | Delete

if ( $box->content_size < $num_read_bytes ) {

[624] Fix | Delete

return INVALID;

[625] Fix | Delete

}

[626] Fix | Delete

if ( !( $data = read( $this->handle, $num_bytes_per_id ) ) ) {

[627] Fix | Delete

return TRUNCATED;

[628] Fix | Delete

}

[629] Fix | Delete

$to_item_id = read_big_endian( $data, $num_bytes_per_id );

[630] Fix | Delete

$tile_count = count( $this->features->tiles );

[631] Fix | Delete

if ( $from_item_id <= MAX_VALUE && $to_item_id <= MAX_VALUE &&

[632] Fix | Delete

$tile_count < MAX_TILES ) {

[633] Fix | Delete

$this->features->tiles[$tile_count] = new Tile();

[634] Fix | Delete

$this->features->tiles[$tile_count]->tile_item_id = $to_item_id;

[635] Fix | Delete

$this->features->tiles[$tile_count]->parent_item_id = $from_item_id;

[636] Fix | Delete

} else {

[637] Fix | Delete

$this->data_was_skipped = true;

[638] Fix | Delete

}

[639] Fix | Delete

}

[640] Fix | Delete

[641] Fix | Delete

// If all features are available now, do not look further.

[642] Fix | Delete

$status = $this->features->get_primary_item_features();

[643] Fix | Delete

if ( $status != NOT_FOUND ) {

[644] Fix | Delete

return $status;

[645] Fix | Delete

}

[646] Fix | Delete

[647] Fix | Delete

// Mostly if 'data_was_skipped'.

[648] Fix | Delete

if ( !skip( $this->handle, $box->content_size - $num_read_bytes ) ) {

[649] Fix | Delete

return TRUNCATED;

[650] Fix | Delete

}

[651] Fix | Delete

} else {

[652] Fix | Delete

if ( !skip( $this->handle, $box->content_size ) ) {

[653] Fix | Delete

return TRUNCATED;

[654] Fix | Delete

}

[655] Fix | Delete

}

[656] Fix | Delete

$num_remaining_bytes -= $box->size;

[657] Fix | Delete

} while ( $num_remaining_bytes > 0 );

[658] Fix | Delete

return NOT_FOUND;

[659] Fix | Delete

}

[660] Fix | Delete

[661] Fix | Delete

/**

[662] Fix | Delete

* Parses a "meta" box.

[663] Fix | Delete

[664] Fix | Delete

* It looks for the primary item ID in the "pitm" box and recurses into other boxes

[665] Fix | Delete

* to find its features.

[666] Fix | Delete

[667] Fix | Delete

* @param stream $handle The resource the box will be parsed from.

[668] Fix | Delete

* @param int $num_remaining_bytes The number of bytes that should be available from the resource.

[669] Fix | Delete

* @return Status FOUND on success or an error on failure.

[670] Fix | Delete

[671] Fix | Delete

private function parse_meta( $num_remaining_bytes ) {

[672] Fix | Delete

do {

[673] Fix | Delete

$box = new Box();

[674] Fix | Delete

$status = $box->parse( $this->handle, $this->num_parsed_boxes, $num_remaining_bytes );

[675] Fix | Delete

if ( $status != FOUND ) {

[676] Fix | Delete

return $status;

[677] Fix | Delete

}

[678] Fix | Delete

[679] Fix | Delete

if ( $box->type == 'pitm' ) {

[680] Fix | Delete

// See ISO/IEC 14496-12:2015(E) 8.11.4.2

[681] Fix | Delete

$num_bytes_per_id = ( $box->version == 0 ) ? 2 : 4;

[682] Fix | Delete

if ( $num_bytes_per_id > $num_remaining_bytes ) {

[683] Fix | Delete

return INVALID;

[684] Fix | Delete

}

[685] Fix | Delete

if ( !( $data = read( $this->handle, $num_bytes_per_id ) ) ) {

[686] Fix | Delete

return TRUNCATED;

[687] Fix | Delete

}

[688] Fix | Delete

$primary_item_id = read_big_endian( $data, $num_bytes_per_id );

[689] Fix | Delete

if ( $primary_item_id > MAX_VALUE ) {

[690] Fix | Delete

return ABORTED;

[691] Fix | Delete

}

[692] Fix | Delete

$this->features->has_primary_item = true;

[693] Fix | Delete

$this->features->primary_item_id = $primary_item_id;

[694] Fix | Delete

if ( !skip( $this->handle, $box->content_size - $num_bytes_per_id ) ) {

[695] Fix | Delete

return TRUNCATED;

[696] Fix | Delete

}

[697] Fix | Delete

} else if ( $box->type == 'iprp' ) {

[698] Fix | Delete

$status = $this->parse_iprp( $box->content_size );

[699] Fix | Delete

if ( $status != NOT_FOUND ) {

[700] Fix | Delete

return $status;

[701] Fix | Delete

}

[702] Fix | Delete

} else if ( $box->type == 'iref' ) {

[703] Fix | Delete

$status = $this->parse_iref( $box->content_size );

[704] Fix | Delete

if ( $status != NOT_FOUND ) {

[705] Fix | Delete

return $status;

[706] Fix | Delete

}

[707] Fix | Delete

} else {

[708] Fix | Delete

if ( !skip( $this->handle, $box->content_size ) ) {

[709] Fix | Delete

return TRUNCATED;

[710] Fix | Delete

}

[711] Fix | Delete

}

[712] Fix | Delete

$num_remaining_bytes -= $box->size;

[713] Fix | Delete

} while ( $num_remaining_bytes != 0 );

[714] Fix | Delete

// According to ISO/IEC 14496-12:2012(E) 8.11.1.1 there is at most one "meta".

[715] Fix | Delete

return INVALID;

[716] Fix | Delete

}

[717] Fix | Delete

[718] Fix | Delete

/**

[719] Fix | Delete

* Parses a file stream.

[720] Fix | Delete

[721] Fix | Delete

* The file type is checked through the "ftyp" box.

[722] Fix | Delete

[723] Fix | Delete

* @return bool True if the input stream is an AVIF bitstream or false.

[724] Fix | Delete

[725] Fix | Delete

public function parse_ftyp() {

[726] Fix | Delete

$box = new Box();

[727] Fix | Delete

$status = $box->parse( $this->handle, $this->num_parsed_boxes );

[728] Fix | Delete

if ( $status != FOUND ) {

[729] Fix | Delete

return false;

[730] Fix | Delete

}

[731] Fix | Delete

[732] Fix | Delete

if ( $box->type != 'ftyp' ) {

[733] Fix | Delete

return false;

[734] Fix | Delete

}

[735] Fix | Delete

// Iterate over brands. See ISO/IEC 14496-12:2012(E) 4.3.1

[736] Fix | Delete

if ( $box->content_size < 8 ) {

[737] Fix | Delete

return false;

[738] Fix | Delete

}

[739] Fix | Delete

for ( $i = 0; $i + 4 <= $box->content_size; $i += 4 ) {

[740] Fix | Delete

if ( !( $data = read( $this->handle, 4 ) ) ) {

[741] Fix | Delete

return false;

[742] Fix | Delete

}

[743] Fix | Delete

if ( $i == 4 ) {

[744] Fix | Delete

continue; // Skip minor_version.

[745] Fix | Delete

}

[746] Fix | Delete

if ( substr( $data, 0, 4 ) == 'avif' || substr( $data, 0, 4 ) == 'avis' ) {

[747] Fix | Delete

return skip( $this->handle, $box->content_size - ( $i + 4 ) );

[748] Fix | Delete

}

[749] Fix | Delete

if ( $i > 32 * 4 ) {

[750] Fix | Delete

return false; // Be reasonable.

[751] Fix | Delete

}

[752] Fix | Delete

[753] Fix | Delete

}

[754] Fix | Delete

return false; // No AVIF brand no good.

[755] Fix | Delete

}

[756] Fix | Delete

[757] Fix | Delete

/**

[758] Fix | Delete

* Parses a file stream.

[759] Fix | Delete

[760] Fix | Delete

* Features are extracted from the "meta" box.

[761] Fix | Delete

[762] Fix | Delete

* @return bool True if the main features of the primary item were parsed or false.

[763] Fix | Delete

[764] Fix | Delete

public function parse_file() {

[765] Fix | Delete

$box = new Box();

[766] Fix | Delete

while ( $box->parse( $this->handle, $this->num_parsed_boxes ) == FOUND ) {

[767] Fix | Delete

if ( $box->type === 'meta' ) {

[768] Fix | Delete

if ( $this->parse_meta( $box->content_size ) != FOUND ) {

[769] Fix | Delete

return false;

[770] Fix | Delete

}

[771] Fix | Delete

return true;

[772] Fix | Delete

}

[773] Fix | Delete

if ( !skip( $this->handle, $box->content_size ) ) {

[774] Fix | Delete

return false;

[775] Fix | Delete

}

[776] Fix | Delete

}

[777] Fix | Delete

return false; // No "meta" no good.

[778] Fix | Delete

}

[779] Fix | Delete

}

[780] Fix | Delete

[781] Fix | Delete