46 lines
1.0 KiB
Plaintext
46 lines
1.0 KiB
Plaintext
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'use strict';
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/* eslint-disable consistent-return */
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var readUInt16LE = require('../common').readUInt16LE;
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var HEADER = 0;
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var TYPE_ICO = 1;
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var INDEX_SIZE = 16;
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// Format specification:
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// https://en.wikipedia.org/wiki/ICO_(file_format)#Icon_resource_structure
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module.exports = function (data) {
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var header = readUInt16LE(data, 0);
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var type = readUInt16LE(data, 2);
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var numImages = readUInt16LE(data, 4);
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if (header !== HEADER || type !== TYPE_ICO || !numImages) {
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return;
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}
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var variants = [];
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var maxSize = { width: 0, height: 0 };
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for (var i = 0; i < numImages; i++) {
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var width = data[6 + INDEX_SIZE * i] || 256;
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var height = data[6 + INDEX_SIZE * i + 1] || 256;
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var size = { width: width, height: height };
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variants.push(size);
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if (width > maxSize.width || height > maxSize.height) {
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maxSize = size;
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}
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}
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return {
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width: maxSize.width,
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height: maxSize.height,
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variants: variants,
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type: 'ico',
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mime: 'image/x-icon',
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wUnits: 'px',
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hUnits: 'px'
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};
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};
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