Drop Adobe Illustrator (.ai) detection support

Author: Borewit

core.js

@@ -5,7 +5,7 @@ Primary entry point, Node.js specific entry point is index.js
 import * as Token from 'token-types';
 import * as strtok3 from 'strtok3/core';
 import {ZipHandler} from '@tokenizer/inflate';
-import {includes, getUintBE} from 'uint8array-extras';
+import {getUintBE} from 'uint8array-extras';
 import {
 	stringToBytes,
 	tarHeaderChecksumMatches,
@@ -718,28 +718,6 @@ export class FileTypeParser {
 		}
 
 		if (this.checkString('%PDF')) {
-			try {
-				const skipBytes = 1350;
-				if (skipBytes === await tokenizer.ignore(skipBytes)) {
-					const maxBufferSize = 10 * 1024 * 1024;
-					const buffer = new Uint8Array(Math.min(maxBufferSize, tokenizer.fileInfo.size - skipBytes));
-					await tokenizer.readBuffer(buffer, {mayBeLess: true});
-
-					// Check if this is an Adobe Illustrator file
-					if (includes(buffer, new TextEncoder().encode('AIPrivateData'))) {
-						return {
-							ext: 'ai',
-							mime: 'application/postscript',
-						};
-					}
-				}
-			} catch (error) {
-				// Swallow end of stream error if file is too small for the Adobe AI check
-				if (!(error instanceof strtok3.EndOfStreamError)) {
-					throw error;
-				}
-			}
-
 			// Assume this is just a normal PDF
 			return {
 				ext: 'pdf',

fixture/fixture-normal.ai

@@ -197,7 +197,6 @@
 		"it",
 		"s3m",
 		"xm",
-		"ai",
 		"skp",
 		"avif",
 		"eps",

fixture/fixture-without-pdf-compatibility.ai

@@ -436,7 +436,6 @@ abortController.abort(); // Abort file-type reading from the Blob stream.
 - [`aac`](https://en.wikipedia.org/wiki/Advanced_Audio_Coding) - Advanced Audio Coding
 - [`ac3`](https://www.atsc.org/standard/a522012-digital-audio-compression-ac-3-e-ac-3-standard-12172012/) - ATSC A/52 Audio File
 - [`ace`](https://en.wikipedia.org/wiki/ACE_(compressed_file_format)) - ACE archive
-- [`ai`](https://en.wikipedia.org/wiki/Adobe_Illustrator_Artwork) - Adobe Illustrator Artwork
 - [`aif`](https://en.wikipedia.org/wiki/Audio_Interchange_File_Format) - Audio Interchange file
 - [`alias`](https://en.wikipedia.org/wiki/Alias_%28Mac_OS%29) - macOS Alias file
 - [`amr`](https://en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec) - Adaptive Multi-Rate audio codec

package.json

@@ -127,7 +127,6 @@ export const extensions = [
 	'it',
 	's3m',
 	'xm',
-	'ai',
 	'skp',
 	'avif',
 	'eps',

readme.md

@@ -216,10 +216,6 @@ const names = {
 		'fixture.wma',
 		'fixture.wmv',
 	],
-	ai: [
-		'fixture-normal', // Normal AI
-		'fixture-without-pdf-compatibility', // AI without the PDF compatibility (cannot be opened by PDF viewers I guess)
-	],
 	jxl: [
 		'fixture', // Image data stored within JXL container
 		'fixture2', // Bare image data with no container