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Viewing file:     index.js (1.79 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.dataUriToBuffer = void 0;
const common_1 = require("./common");
function base64ToArrayBuffer(base64) {
    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
    const bytes = [];
    for (let i = 0; i < base64.length; i += 4) {
        const idx0 = chars.indexOf(base64.charAt(i));
        const idx1 = chars.indexOf(base64.charAt(i + 1));
        const idx2 = base64.charAt(i + 2) === '='
            ? 0
            : chars.indexOf(base64.charAt(i + 2));
        const idx3 = base64.charAt(i + 3) === '='
            ? 0
            : chars.indexOf(base64.charAt(i + 3));
        const bin0 = (idx0 << 2) | (idx1 >> 4);
        const bin1 = ((idx1 & 15) << 4) | (idx2 >> 2);
        const bin2 = ((idx2 & 3) << 6) | idx3;
        bytes.push(bin0);
        if (base64.charAt(i + 2) !== '=')
            bytes.push(bin1);
        if (base64.charAt(i + 3) !== '=')
            bytes.push(bin2);
    }
    const buffer = new ArrayBuffer(bytes.length);
    const view = new Uint8Array(buffer);
    view.set(bytes);
    return buffer;
}
function stringToBuffer(str) {
    // Create a buffer with length equal to the string length
    const buffer = new ArrayBuffer(str.length);
    // Create a view to manipulate the buffer content
    const view = new Uint8Array(buffer);
    // Iterate over the string and populate the buffer with ASCII codes
    for (let i = 0; i < str.length; i++) {
        view[i] = str.charCodeAt(i);
    }
    return buffer;
}
/**
 * Returns a `Buffer` instance from the given data URI `uri`.
 *
 * @param {String} uri Data URI to turn into a Buffer instance
 */
exports.dataUriToBuffer = (0, common_1.makeDataUriToBuffer)({ stringToBuffer, base64ToArrayBuffer });
//# sourceMappingURL=index.js.map