1 files changed, 71 insertions, 0 deletions
diff --git a/node_modules/webpack/lib/util/hash/BatchedHash.js b/node_modules/webpack/lib/util/hash/BatchedHash.js
new file mode 100644
index 00000000..cc030f8b
--- /dev/null
+++ b/node_modules/webpack/lib/util/hash/BatchedHash.js
@@ -0,0 +1,71 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const Hash = require("../Hash");
+const MAX_SHORT_STRING = require("./wasm-hash").MAX_SHORT_STRING;
+
+class BatchedHash extends Hash {
+	/**
+	 * @param {Hash} hash hash
+	 */
+	constructor(hash) {
+		super();
+		this.string = undefined;
+		this.encoding = undefined;
+		this.hash = hash;
+	}
+
+	/**
+	 * Update hash {@link https://nodejs.org/api/crypto.html#crypto_hash_update_data_inputencoding}
+	 * @param {string|Buffer} data data
+	 * @param {string=} inputEncoding data encoding
+	 * @returns {this} updated hash
+	 */
+	update(data, inputEncoding) {
+		if (this.string !== undefined) {
+			if (
+				typeof data === "string" &&
+				inputEncoding === this.encoding &&
+				this.string.length + data.length < MAX_SHORT_STRING
+			) {
+				this.string += data;
+				return this;
+			}
+			this.hash.update(this.string, this.encoding);
+			this.string = undefined;
+		}
+		if (typeof data === "string") {
+			if (
+				data.length < MAX_SHORT_STRING &&
+				// base64 encoding is not valid since it may contain padding chars
+				(!inputEncoding || !inputEncoding.startsWith("ba"))
+			) {
+				this.string = data;
+				this.encoding = inputEncoding;
+			} else {
+				this.hash.update(data, inputEncoding);
+			}
+		} else {
+			this.hash.update(data);
+		}
+		return this;
+	}
+
+	/**
+	 * Calculates the digest {@link https://nodejs.org/api/crypto.html#crypto_hash_digest_encoding}
+	 * @param {string=} encoding encoding of the return value
+	 * @returns {string|Buffer} digest
+	 */
+	digest(encoding) {
+		if (this.string !== undefined) {
+			this.hash.update(this.string, this.encoding);
+		}
+		return this.hash.digest(encoding);
+	}
+}
+
+module.exports = BatchedHash;