bugfix #2514: FLAC zero-byte block header

https://www.getid3.org/phpBB3/viewtopic.php?t=2514

Author: JamesHeinrich

changelog.txt

@@ -18,6 +18,35 @@
 Version History
 ===============
 
+1.9.16: [2018-10-17] James Heinrich :: 1.9.16-201810171314
+	* bugfix (G:168) Ogg FLAC not parsed
+	* bugfix (G:163) invalid MP3 header error on VBR
+	* bugfix (G:162) prevent writing multiple ID3v2 versions
+	* bugfix (G:161) MP3 VBR header duration
+	* bugfix (G:160) OggOpus duration sometimes incorrect
+	* bugfix (G:157) quicktime GPS invalid argument
+	* bugfix (G:148) MPEG-2 aspect ratio
+	* bugfix (G:147) Quicktime fourcc codec name lookup
+	* bugfix (G:147) Quicktime audio/video bitrate guessing
+	* bugfix (G:145) incompatible variable types
+	* bugfix (G:139) Quicktime islt subatoms >5
+	* bugfix (G:137) ID3v2 semi-numeric genres
+	* bugfix (G:136) ID3v2 unsynchronised typo
+	* bugfix (#2514) FLAC zero-byte block header
+	* bugfix (#2488) MIME types (FLAC, WAV, gzip)
+	* bugfix (#2468) Quicktime video rotation
+	* bugfix (#2207) metaflac + attached pictures
+	* bugfix (#2151) improved demo UNC filename support
+	* bugfix (#1966) fread fail when PHP memory_limit -1
+	* bugfix (#1908) Quicktime rotation detection (using matrix values)
+	* bugfix (#1908) Quicktime "rcif" and "dscp" atoms
+	* bugfix (#1900) demo.joinmp3 cut from end
+	* security: avoid disabled demo reflection
+	* TIFF: expand list of named tags, expose as 'tag_name' key for all entries
+	* Quicktime: parse some GoPro-specific data
+	* helperapps (Windows): updated vorbiscomment.exe, metaflac.exe to v1.3.2
+	* add more image formats supported by getimagesize()
+
 1.9.15: [2017-10-26] James Heinrich :: 1.9.15-201709291043
     » (G:108) add basic APNG support
     » (G:107) add basic WebP support

getid3/getid3.php

@@ -251,7 +251,7 @@ class getID3
 	 */
 	protected $startup_warning = '';
 
-	const VERSION           = '1.9.15-201809221240';
+	const VERSION           = '1.9.16-201810171314';
 	const FREAD_BUFFER_SIZE = 32768;
 
 	const ATTACHMENTS_NONE   = false;

getid3/module.audio.flac.php

@@ -52,7 +52,7 @@ public function parseMETAdata() {
 		do {
 			$BlockOffset   = $this->ftell();
 			$BlockHeader   = $this->fread(4);
-			$LBFBT         = getid3_lib::BigEndian2Int(substr($BlockHeader, 0, 1));
+			$LBFBT         = getid3_lib::BigEndian2Int(substr($BlockHeader, 0, 1));  // LBFBT = LastBlockFlag + BlockType
 			$LastBlockFlag = (bool) ($LBFBT & 0x80);
 			$BlockType     =        ($LBFBT & 0x7F);
 			$BlockLength   = getid3_lib::BigEndian2Int(substr($BlockHeader, 1, 3));
@@ -63,6 +63,11 @@ public function parseMETAdata() {
 				break;
 			}
 			if ($BlockLength < 1) {
+				if ($BlockTypeText != 'reserved') {
+					// probably supposed to be zero-length
+					$this->warning('METADATA_BLOCK_HEADER.BLOCK_LENGTH ('.$BlockTypeText.') at offset '.$BlockOffset.' is zero bytes');
+					continue;
+				}
 				$this->error('METADATA_BLOCK_HEADER.BLOCK_LENGTH ('.$BlockLength.') at offset '.$BlockOffset.' is invalid');
 				break;
 			}