| // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| class MagicNumber { |
| final String mimeType; |
| final List<int> numbers; |
| final List<int>? mask; |
| |
| const MagicNumber(this.mimeType, this.numbers, {this.mask}); |
| |
| bool matches(List<int> header) { |
| if (header.length < numbers.length) return false; |
| |
| for (var i = 0; i < numbers.length; i++) { |
| if (mask != null) { |
| if ((mask![i] & numbers[i]) != (mask![i] & header[i])) return false; |
| } else { |
| if (numbers[i] != header[i]) return false; |
| } |
| } |
| |
| return true; |
| } |
| } |
| |
| const int initialMagicNumbersMaxLength = 12; |
| |
| const List<MagicNumber> initialMagicNumbers = [ |
| MagicNumber('application/pdf', [0x25, 0x50, 0x44, 0x46]), |
| MagicNumber('application/postscript', [0x25, 0x51]), |
| |
| /// AIFF is based on the EA IFF 85 Standard for Interchange Format Files. |
| /// -> 4 bytes have the ASCII characters 'F' 'O' 'R' 'M'. |
| /// -> 4 bytes indicating the size of the file |
| /// -> 4 bytes have the ASCII characters 'A' 'I' 'F' 'F'. |
| /// http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/AIFF/Docs/AIFF-1.3.pdf |
| MagicNumber('audio/x-aiff', [ |
| 0x46, |
| 0x4F, |
| 0x52, |
| 0x4D, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x41, |
| 0x49, |
| 0x46, |
| 0x46 |
| ], mask: [ |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF |
| ]), |
| |
| /// -> 4 bytes have the ASCII characters 'f' 'L' 'a' 'C'. |
| /// https://xiph.org/flac/format.html |
| MagicNumber('audio/x-flac', [0x66, 0x4C, 0x61, 0x43]), |
| |
| /// The WAVE file format is based on the RIFF document format. |
| /// -> 4 bytes have the ASCII characters 'R' 'I' 'F' 'F'. |
| /// -> 4 bytes indicating the size of the file |
| /// -> 4 bytes have the ASCII characters 'W' 'A' 'V' 'E'. |
| /// http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/Docs/riffmci.pdf |
| MagicNumber('audio/x-wav', [ |
| 0x52, |
| 0x49, |
| 0x46, |
| 0x46, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x57, |
| 0x41, |
| 0x56, |
| 0x45 |
| ], mask: [ |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF |
| ]), |
| MagicNumber('image/gif', [0x47, 0x49, 0x46, 0x38, 0x37, 0x61]), |
| MagicNumber('image/gif', [0x47, 0x49, 0x46, 0x38, 0x39, 0x61]), |
| MagicNumber('image/jpeg', [0xFF, 0xD8]), |
| MagicNumber('image/png', [0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]), |
| MagicNumber('image/tiff', [0x49, 0x49, 0x2A, 0x00]), |
| MagicNumber('image/tiff', [0x4D, 0x4D, 0x00, 0x2A]), |
| MagicNumber('audio/aac', [0xFF, 0xF1]), |
| MagicNumber('audio/aac', [0xFF, 0xF9]), |
| MagicNumber('audio/weba', [0x1A, 0x45, 0xDF, 0xA3]), |
| MagicNumber('audio/mpeg', [0x49, 0x44, 0x33]), |
| MagicNumber('audio/mpeg', [0xFF, 0xFB]), |
| MagicNumber('audio/ogg', [0x4F, 0x70, 0x75]), |
| MagicNumber('video/3gpp', [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x66, |
| 0x74, |
| 0x79, |
| 0x70, |
| 0x33, |
| 0x67, |
| 0x70, |
| 0x35 |
| ], mask: [ |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0x00, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF |
| ]), |
| MagicNumber('video/mp4', [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x66, |
| 0x74, |
| 0x79, |
| 0x70, |
| 0x61, |
| 0x76, |
| 0x63, |
| 0x31 |
| ], mask: [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF |
| ]), |
| MagicNumber('video/mp4', [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x66, |
| 0x74, |
| 0x79, |
| 0x70, |
| 0x69, |
| 0x73, |
| 0x6F, |
| 0x32 |
| ], mask: [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF |
| ]), |
| MagicNumber('video/mp4', [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x66, |
| 0x74, |
| 0x79, |
| 0x70, |
| 0x69, |
| 0x73, |
| 0x6F, |
| 0x6D |
| ], mask: [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF |
| ]), |
| MagicNumber('video/mp4', [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x66, |
| 0x74, |
| 0x79, |
| 0x70, |
| 0x6D, |
| 0x70, |
| 0x34, |
| 0x31 |
| ], mask: [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF |
| ]), |
| MagicNumber('video/mp4', [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x66, |
| 0x74, |
| 0x79, |
| 0x70, |
| 0x6D, |
| 0x70, |
| 0x34, |
| 0x32 |
| ], mask: [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF |
| ]), |
| MagicNumber('model/gltf-binary', [0x46, 0x54, 0x6C, 0x67]), |
| |
| /// The WebP file format is based on the RIFF document format. |
| /// -> 4 bytes have the ASCII characters 'R' 'I' 'F' 'F'. |
| /// -> 4 bytes indicating the size of the file |
| /// -> 4 bytes have the ASCII characters 'W' 'E' 'B' 'P'. |
| /// https://developers.google.com/speed/webp/docs/riff_container |
| MagicNumber('image/webp', [ |
| 0x52, |
| 0x49, |
| 0x46, |
| 0x46, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x57, |
| 0x45, |
| 0x42, |
| 0x50 |
| ], mask: [ |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF |
| ]), |
| |
| MagicNumber('font/woff2', [0x77, 0x4f, 0x46, 0x32]), |
| |
| /// High Efficiency Image File Format (ISO/IEC 23008-12). |
| /// -> 4 bytes indicating the ftyp box length. |
| /// -> 4 bytes have the ASCII characters 'f' 't' 'y' 'p'. |
| /// -> 4 bytes have the ASCII characters 'h' 'e' 'i' 'c'. |
| /// https://www.iana.org/assignments/media-types/image/heic |
| MagicNumber('image/heic', [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x66, |
| 0x74, |
| 0x79, |
| 0x70, |
| 0x68, |
| 0x65, |
| 0x69, |
| 0x63 |
| ], mask: [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF |
| ]), |
| |
| /// -> 4 bytes indicating the ftyp box length. |
| /// -> 4 bytes have the ASCII characters 'f' 't' 'y' 'p'. |
| /// -> 4 bytes have the ASCII characters 'h' 'e' 'i' 'x'. |
| MagicNumber('image/heic', [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x66, |
| 0x74, |
| 0x79, |
| 0x70, |
| 0x68, |
| 0x65, |
| 0x69, |
| 0x78 |
| ], mask: [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF |
| ]), |
| |
| /// -> 4 bytes indicating the ftyp box length. |
| /// -> 4 bytes have the ASCII characters 'f' 't' 'y' 'p'. |
| /// -> 4 bytes have the ASCII characters 'm' 'i' 'f' '1'. |
| MagicNumber('image/heif', [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x66, |
| 0x74, |
| 0x79, |
| 0x70, |
| 0x6D, |
| 0x69, |
| 0x66, |
| 0x31 |
| ], mask: [ |
| 0x00, |
| 0x00, |
| 0x00, |
| 0x00, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF, |
| 0xFF |
| ]), |
| ]; |