yetangitu/bitjs
1
0
Fork 0
mirror of https://github.com/codedread/bitjs synced 2025-10-03 09:39:16 +02:00
Code Issues Releases Wiki Activity

Add ICO image to the file sniffer. Update the manifest to 1.0.11.

Browse source
This commit is contained in:
Jeff Schiller 2023-02-15 21:33:38 -08:00
parent 73c4080579
commit 83a07c970d
4 changed files with 24 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

16
file/sniffer.js
View file

@ -13,22 +13,25 @@
const fileSignatures = {
// Document formats.
'application/pdf': [[0x25, 0x50, 0x44, 0x46, 0x2d]],
// Archive formats:
'application/x-tar': [
[0x75, 0x73, 0x74, 0x61, 0x72, 0x00, 0x30, 0x30],
[0x75, 0x73, 0x74, 0x61, 0x72, 0x20, 0x20, 0x00],
],
// Compressed archive formats.
'application/x-7z-compressed': [[0x37, 0x7A, 0xBC, 0xAF, 0x27, 0x1C]],
'application/x-bzip2': [[0x42, 0x5A, 0x68]],
'application/x-rar-compressed': [[0x52, 0x61, 0x72, 0x21, 0x1A, 0x07]],
'application/zip': [[0x50, 0x4B, 0x03, 0x04], [0x50, 0x4B, 0x05, 0x06], [0x50, 0x4B, 0x07, 0x08]],
// Image formats.
'image/bmp': [[0x42, 0x4D]],
'image/gif': [[0x47, 0x49, 0x46, 0x38]],
'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]],
'image/x-icon': [[0x00, 0x00, 0x01, 0x00]],
// Audio/Video formats.
'application/ogg': [[0x4F, 0x67, 0x67, 0x53]],
'audio/flac': [[0x66, 0x4C, 0x61, 0x43]],
@ -77,8 +80,12 @@ export function initialize() {
for (const byte of signature) {
if (curNode.children[byte] === undefined) {
if (byte === '??' && !curNode.children['??'] && Object.keys(curNode.children).length > 0) {
// Reset the byte tree, it is bogus.
root = null;
throw 'Cannot add a placeholder child to a node that has non-placeholder children';
} else if (byte !== '??' && curNode.children['??']) {
// Reset the byte tree, it is bogus.
root = null;
throw 'Cannot add a non-placeholder child to a node that has a placeholder child';
}
curNode.children[byte] = new Node(byte);
@ -114,6 +121,7 @@ export function findMimeType(ab) {
const depth = ab.byteLength < maxDepth ? ab.byteLength : maxDepth;
const arr = new Uint8Array(ab).subarray(0, depth);
let curNode = root;
let mimeType;
// Step through bytes, updating curNode as it walks down the byte tree.
for (const byte of arr) {
// If this node has a placeholder child, just step into it.
@ -123,6 +131,10 @@ export function findMimeType(ab) {
}
if (curNode.children[byte] === undefined) return undefined;
curNode = curNode.children[byte];
if (curNode.mimeType) return curNode.mimeType;
if (curNode.mimeType) {
mimeType = curNode.mimeType;
break;
}
}
return mimeType;
}