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Kha/Tools/macos/std/haxe/crypto/Adler32.hx

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+/*
+ * Copyright (C)2005-2019 Haxe Foundation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+package haxe.crypto;
+
+/**
+	Calculates the Adler32 of the given Bytes.
+ */
+class Adler32 {
+	var a1:Int;
+	var a2:Int;
+
+	public function new() {
+		a1 = 1;
+		a2 = 0;
+	}
+
+	public function get() {
+		return (a2 << 16) | a1;
+	}
+
+	public function update(b:haxe.io.Bytes, pos, len) {
+		var a1 = a1, a2 = a2;
+		for (p in pos...pos + len) {
+			var c = b.get(p);
+			a1 = (a1 + c) % 65521;
+			a2 = (a2 + a1) % 65521;
+		}
+		this.a1 = a1;
+		this.a2 = a2;
+	}
+
+	public function equals(a:Adler32) {
+		return a.a1 == a1 && a.a2 == a2;
+	}
+
+	public function toString() {
+		return StringTools.hex(a2, 8) + StringTools.hex(a1, 8);
+	}
+
+	public static function read(i:haxe.io.Input) {
+		var a = new Adler32();
+		var a2a = i.readByte();
+		var a2b = i.readByte();
+		var a1a = i.readByte();
+		var a1b = i.readByte();
+		a.a1 = (a1a << 8) | a1b;
+		a.a2 = (a2a << 8) | a2b;
+		return a;
+	}
+
+	public static function make(b:haxe.io.Bytes) {
+		var a = new Adler32();
+		a.update(b, 0, b.length);
+		return a.get();
+	}
+}