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- 'use strict';
-
- /**
- * Module exports.
- */
-
- module.exports = dataUriToBuffer;
-
- /**
- * Returns a `Buffer` instance from the given data URI `uri`.
- *
- * @param {String} uri Data URI to turn into a Buffer instance
- * @return {Buffer} Buffer instance from Data URI
- * @api public
- */
-
- function dataUriToBuffer (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
- var firstComma = uri.indexOf(',');
- if (-1 === firstComma || firstComma <= 4) throw new TypeError('malformed data: URI');
-
- // remove the "data:" scheme and parse the metadata
- var meta = uri.substring(5, firstComma).split(';');
-
- var base64 = false;
- var charset = 'US-ASCII';
- for (var i = 0; i < meta.length; i++) {
- if ('base64' == meta[i]) {
- base64 = true;
- } else if (0 == meta[i].indexOf('charset=')) {
- charset = meta[i].substring(8);
- }
- }
-
- // get the encoded data portion and decode URI-encoded chars
- var data = unescape(uri.substring(firstComma + 1));
-
- var encoding = base64 ? 'base64' : 'ascii';
- var buffer = new Buffer(data, encoding);
-
- // set `.type` property to MIME type
- buffer.type = meta[0] || 'text/plain';
-
- // set the `.charset` property
- buffer.charset = charset;
-
- return buffer;
- }
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