common.js•1.84 kB
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.makeDataUriToBuffer = void 0;
/**
* Returns a `Buffer` instance from the given data URI `uri`.
*
* @param {String} uri Data URI to turn into a Buffer instance
*/
const makeDataUriToBuffer = (convert) => (uri) => {
uri = String(uri);
if (!/^data:/i.test(uri)) {
throw new TypeError('`uri` does not appear to be a Data URI (must begin with "data:")');
}
// strip newlines
uri = uri.replace(/\r?\n/g, '');
// split the URI up into the "metadata" and the "data" portions
const firstComma = uri.indexOf(',');
if (firstComma === -1 || firstComma <= 4) {
throw new TypeError('malformed data: URI');
}
// remove the "data:" scheme and parse the metadata
const meta = uri.substring(5, firstComma).split(';');
let charset = '';
let base64 = false;
const type = meta[0] || 'text/plain';
let typeFull = type;
for (let i = 1; i < meta.length; i++) {
if (meta[i] === 'base64') {
base64 = true;
}
else if (meta[i]) {
typeFull += `;${meta[i]}`;
if (meta[i].indexOf('charset=') === 0) {
charset = meta[i].substring(8);
}
}
}
// defaults to US-ASCII only if type is not provided
if (!meta[0] && !charset.length) {
typeFull += ';charset=US-ASCII';
charset = 'US-ASCII';
}
// get the encoded data portion and decode URI-encoded chars
const data = unescape(uri.substring(firstComma + 1));
const buffer = base64 ? convert.base64ToArrayBuffer(data) : convert.stringToBuffer(data);
return {
type,
typeFull,
charset,
buffer,
};
};
exports.makeDataUriToBuffer = makeDataUriToBuffer;
//# sourceMappingURL=common.js.map