/
magic_number.dart
407 lines (392 loc) · 6.71 KB
/
magic_number.dart
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// 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
]),
];