65 lines
1.9 KiB
Haxe
65 lines
1.9 KiB
Haxe
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/*
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* Copyright (C)2005-2019 Haxe Foundation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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package haxe.crypto;
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/**
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Calculates the Crc32 of the given Bytes.
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*/
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class Crc32 {
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var crc:Int;
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public inline function new() {
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crc = 0xFFFFFFFF;
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}
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public inline function byte(b:Int) {
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var tmp = (crc ^ b) & 0xFF;
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for (j in 0...8)
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tmp = (tmp >>> 1) ^ (-(tmp & 1) & 0xEDB88320);
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crc = (crc >>> 8) ^ tmp;
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}
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public inline function update(b:haxe.io.Bytes, pos, len) {
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var b = b.getData();
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for (i in pos...pos + len) {
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var tmp = (crc ^ haxe.io.Bytes.fastGet(b, i)) & 0xFF;
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for (j in 0...8)
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tmp = (tmp >>> 1) ^ (-(tmp & 1) & 0xEDB88320);
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crc = (crc >>> 8) ^ tmp;
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}
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}
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public inline function get() {
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return crc ^ 0xFFFFFFFF;
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}
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/**
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Calculates the CRC32 of the given data bytes
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**/
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public static function make(data:haxe.io.Bytes):Int {
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var c = new Crc32();
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c.update(data, 0, data.length);
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return c.get();
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}
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}
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