1 files changed, 53 insertions, 0 deletions
diff --git a/node_modules/loader-utils/lib/getHashDigest.js b/node_modules/loader-utils/lib/getHashDigest.js
new file mode 100644
index 000000000..6f4a427e5
--- /dev/null
+++ b/node_modules/loader-utils/lib/getHashDigest.js
@@ -0,0 +1,53 @@
+"use strict";
+
+const baseEncodeTables = {
+	26: "abcdefghijklmnopqrstuvwxyz",
+	32: "123456789abcdefghjkmnpqrstuvwxyz", // no 0lio
+	36: "0123456789abcdefghijklmnopqrstuvwxyz",
+	49: "abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ", // no lIO
+	52: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ",
+	58: "123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ", // no 0lIO
+	62: "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ",
+	64: "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_"
+};
+
+function encodeBufferToBase(buffer, base) {
+	const encodeTable = baseEncodeTables[base];
+	if(!encodeTable) throw new Error("Unknown encoding base" + base);
+
+	const readLength = buffer.length;
+
+	const Big = require("big.js");
+	Big.RM = Big.DP = 0;
+	let b = new Big(0);
+	for(let i = readLength - 1; i >= 0; i--) {
+		b = b.times(256).plus(buffer[i]);
+	}
+
+	let output = "";
+	while(b.gt(0)) {
+		output = encodeTable[b.mod(base)] + output;
+		b = b.div(base);
+	}
+
+	Big.DP = 20;
+	Big.RM = 1;
+
+	return output;
+}
+
+function getHashDigest(buffer, hashType, digestType, maxLength) {
+	hashType = hashType || "md5";
+	maxLength = maxLength || 9999;
+	const hash = require("crypto").createHash(hashType);
+	hash.update(buffer);
+	if(digestType === "base26" || digestType === "base32" || digestType === "base36" ||
+		digestType === "base49" || digestType === "base52" || digestType === "base58" ||
+		digestType === "base62" || digestType === "base64") {
+		return encodeBufferToBase(hash.digest(), digestType.substr(4)).substr(0, maxLength);
+	} else {
+		return hash.digest(digestType || "hex").substr(0, maxLength);
+	}
+}
+
+module.exports = getHashDigest;