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node_modules/webpack/lib/util/dataURL.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Natsu @xiaoxiaojx
+*/
+
+"use strict";
+
+// data URL scheme: "data:text/javascript;charset=utf-8;base64,some-string"
+// http://www.ietf.org/rfc/rfc2397.txt
+const URIRegEx = /^data:([^;,]+)?((?:;[^;,]+)*?)(?:;(base64)?)?,(.*)$/i;
+
+/**
+ * @param {string} uri data URI
+ * @returns {Buffer | null} decoded data
+ */
+const decodeDataURI = (uri) => {
+	const match = URIRegEx.exec(uri);
+	if (!match) return null;
+
+	const isBase64 = match[3];
+	const body = match[4];
+
+	if (isBase64) {
+		return Buffer.from(body, "base64");
+	}
+
+	// CSS allows to use `data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg"><rect width="100%" height="100%" style="stroke: rgb(223,224,225); stroke-width: 2px; fill: none; stroke-dasharray: 6px 3px" /></svg>`
+	// so we return original body if we can't `decodeURIComponent`
+	try {
+		return Buffer.from(decodeURIComponent(body), "ascii");
+	} catch (_) {
+		return Buffer.from(body, "ascii");
+	}
+};
+
+module.exports = {
+	URIRegEx,
+	decodeDataURI
+};