advanced-cropper/extensions/mimes/index.js

The core of the advanced cropper libraries family

import { isArrayBufferLike } from '../../utils/index.js';

var imageMimes = [
    {
        format: 'image/png',
        pattern: [0x89, 0x50, 0x4e, 0x47],
    },
    {
        format: 'image/jpeg',
        pattern: [0xff, 0xd8, 0xff],
    },
    {
        format: 'image/gif',
        pattern: [0x47, 0x49, 0x46, 0x38],
    },
    {
        format: 'image/webp',
        pattern: [
            0x52,
            0x49,
            0x46,
            0x46,
            undefined,
            undefined,
            undefined,
            undefined,
            0x57,
            0x45,
            0x42,
            0x50,
            0x56,
            0x50,
        ],
    },
];
function getMimeType(data, fallback) {
    if (fallback === void 0) { fallback = null; }
    var mimeType = fallback;
    if (isArrayBufferLike(data)) {
        var byteArray_1 = new Uint8Array(data).subarray(0, 4);
        var candidate = imageMimes.find(function (el) { return el.pattern.every(function (p, i) { return !p || byteArray_1[i] === p; }); });
        if (candidate) {
            mimeType = candidate.format;
        }
    }
    if (mimeType) {
        return mimeType;
    }
}

export { getMimeType };