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| 1 | <?php |
| 2 | /** |
| 3 | * Extractor for the Resource Interchange File Format |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 18 | * http://www.gnu.org/copyleft/gpl.html |
| 19 | * |
| 20 | * @file |
| 21 | * @author Bryan Tong Minh |
| 22 | * @ingroup Media |
| 23 | */ |
| 24 | |
| 25 | class RiffExtractor { |
| 26 | public static function findChunksFromFile( $filename, $maxChunks = -1 ) { |
| 27 | $file = fopen( $filename, 'rb' ); |
| 28 | $info = self::findChunks( $file, $maxChunks ); |
| 29 | fclose( $file ); |
| 30 | return $info; |
| 31 | } |
| 32 | |
| 33 | public static function findChunks( $file, $maxChunks = -1 ) { |
| 34 | $riff = fread( $file, 4 ); |
| 35 | if ( $riff !== 'RIFF' ) { |
| 36 | return false; |
| 37 | } |
| 38 | |
| 39 | // Next four bytes are fileSize |
| 40 | $fileSize = fread( $file, 4 ); |
| 41 | if ( !$fileSize || strlen( $fileSize ) != 4 ) { |
| 42 | return false; |
| 43 | } |
| 44 | |
| 45 | // Next four bytes are the FourCC |
| 46 | $fourCC = fread( $file, 4 ); |
| 47 | if ( !$fourCC || strlen( $fourCC ) != 4 ) { |
| 48 | return false; |
| 49 | } |
| 50 | |
| 51 | // Create basic info structure |
| 52 | $info = [ |
| 53 | 'fileSize' => self::extractUInt32( $fileSize ), |
| 54 | 'fourCC' => $fourCC, |
| 55 | 'chunks' => [], |
| 56 | ]; |
| 57 | $numberOfChunks = 0; |
| 58 | |
| 59 | // Find out the chunks |
| 60 | while ( !feof( $file ) && !( $numberOfChunks >= $maxChunks && $maxChunks >= 0 ) ) { |
| 61 | $chunkStart = ftell( $file ); |
| 62 | |
| 63 | $chunkFourCC = fread( $file, 4 ); |
| 64 | if ( !$chunkFourCC || strlen( $chunkFourCC ) != 4 ) { |
| 65 | return $info; |
| 66 | } |
| 67 | |
| 68 | $chunkSize = fread( $file, 4 ); |
| 69 | if ( !$chunkSize || strlen( $chunkSize ) != 4 ) { |
| 70 | return $info; |
| 71 | } |
| 72 | $intChunkSize = self::extractUInt32( $chunkSize ); |
| 73 | |
| 74 | // Add chunk info to the info structure |
| 75 | $info['chunks'][] = [ |
| 76 | 'fourCC' => $chunkFourCC, |
| 77 | 'start' => $chunkStart, |
| 78 | 'size' => $intChunkSize |
| 79 | ]; |
| 80 | |
| 81 | // Uneven chunks have padding bytes |
| 82 | $padding = $intChunkSize % 2; |
| 83 | // Seek to the next chunk |
| 84 | fseek( $file, $intChunkSize + $padding, SEEK_CUR ); |
| 85 | |
| 86 | } |
| 87 | |
| 88 | return $info; |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * Extract a little-endian uint32 from a 4 byte string |
| 93 | * @param string $string 4-byte string |
| 94 | * @return int |
| 95 | */ |
| 96 | public static function extractUInt32( $string ) { |
| 97 | return unpack( 'V', $string )[1]; |
| 98 | } |
| 99 | } |