image-size

Version:

get dimensions of any image file

10 lines (9 loc) • 297 B

JavaScript

import { readUInt16LE, toUTF8String } from './utils.js';
const gifRegexp = /^GIF8[79]a/;
export const GIF = {
    validate: (input) => gifRegexp.test(toUTF8String(input, 0, 6)),
    calculate: (input) => ({
        height: readUInt16LE(input, 8),
        width: readUInt16LE(input, 6),
    }),
};