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Code Issues Releases Wiki Activity

Add a couple audio file formats to sniffer

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codedread 2020-07-17 11:01:08 -07:00
parent e815252ae1
commit 557a40e810
3 changed files with 17 additions and 1 deletions
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9
file/sniffer.js
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@ -1,5 +1,6 @@
/**
* File Sniffer.
* Makes an attempt to resolve a byte stream into a MIME type.
*
* Licensed under the MIT License
*
@ -9,7 +10,6 @@
// A selection from https://en.wikipedia.org/wiki/List_of_file_signatures.
// Mapping of MIME type to magic numbers. Each file type can have multiple signatures.
// '??' is used as a placeholder value.
// TODO: Add audio/video formats?
const fileSignatures = {
// Document formats.
'application/pdf': [[0x25, 0x50, 0x44, 0x46, 0x2d]],
@ -24,8 +24,15 @@ const fileSignatures = {
'image/jpeg': [[0xFF, 0xD8, 0xFF]],
'image/png': [[0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]],
'image/webp': [[0x52, 0x49, 0x46, 0x46, '??', '??', '??', '??', 0x57, 0x45, 0x42, 0x50]],
// Audio/Video formats.
'application/ogg': [[0x4F, 0x67, 0x67, 0x53]],
'audio/mpeg': [[0xFF, 0xFB], [0xFF, 0xF3], [0xFF, 0xF2], [0x49, 0x44, 0x33]],
};
// TODO: Eventually add support for various container formats so that:
// * an OGG container can be resolved to OGG Audio, OGG Video
// * an HEIF container can be resolved to AVIF, HEIC
class Node {
/** @param {number} value */
constructor(value) {