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Code Issues Releases Wiki Activity

Update file sniffer to be an ES module

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This commit is contained in:
codedread 2020-04-02 19:30:21 -07:00
parent 2cc77f905b
commit 0312134ae3
2 changed files with 5 additions and 11 deletions
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9
file/sniffer.js
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@ -6,11 +6,6 @@
* Copyright(c) 2020 Google Inc. * Copyright(c) 2020 Google Inc.
*/ */
var bitjs = bitjs || {};
bitjs.file = bitjs.file || {};
(function() {
// A selection from https://en.wikipedia.org/wiki/List_of_file_signatures. // 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. // Mapping of MIME type to magic numbers. Each file type can have multiple signatures.
// '??' is used as a placeholder value. // '??' is used as a placeholder value.
@ -79,7 +74,7 @@ for (const mimeType in fileSignatures) {
* @param {ArrayBuffer} ab * @param {ArrayBuffer} ab
* @return {string} The MIME type of the buffer, or undefined. * @return {string} The MIME type of the buffer, or undefined.
*/ */
bitjs.file.findMimeType = function(ab) { export function findMimeType(ab) {
const depth = ab.byteLength < maxDepth ? ab.byteLength : maxDepth; const depth = ab.byteLength < maxDepth ? ab.byteLength : maxDepth;
const arr = new Uint8Array(ab).subarray(0, depth); const arr = new Uint8Array(ab).subarray(0, depth);
let curNode = root; let curNode = root;
@ -94,5 +89,3 @@ bitjs.file.findMimeType = function(ab) {
if (curNode.mimeType) return curNode.mimeType; if (curNode.mimeType) return curNode.mimeType;
} }
}; };
})();

7
tests/file-sniffer-test.html
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@ -3,10 +3,11 @@
<head> <head>
<title>Unit tests for bitjs.io.ByteStreamBitStream</title> <title>Unit tests for bitjs.io.ByteStreamBitStream</title>
<script src="muther.js"></script> <script src="muther.js"></script>
<script src="../file/sniffer.js"></script>
</head> </head>
<body> <body>
<script> <script type="module">
import { findMimeType } from '../file/sniffer.js';
const assert = muther.assert; const assert = muther.assert;
const assertEquals = muther.assertEquals; const assertEquals = muther.assertEquals;
const assertThrows = muther.assertThrows; const assertThrows = muther.assertThrows;
@ -14,7 +15,7 @@
function sniffTest(mimeType, sig) { function sniffTest(mimeType, sig) {
const array = new Uint8Array(16); const array = new Uint8Array(16);
array.set(sig); array.set(sig);
assertEquals(mimeType, bitjs.file.findMimeType(array.buffer)); assertEquals(mimeType, findMimeType(array.buffer));
} }
muther.go({ muther.go({