65 lines
1.9 KiB
Haxe
65 lines
1.9 KiB
Haxe
/*
|
|
* 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 Crc32 of the given Bytes.
|
|
*/
|
|
class Crc32 {
|
|
var crc:Int;
|
|
|
|
public inline function new() {
|
|
crc = 0xFFFFFFFF;
|
|
}
|
|
|
|
public inline function byte(b:Int) {
|
|
var tmp = (crc ^ b) & 0xFF;
|
|
for (j in 0...8)
|
|
tmp = (tmp >>> 1) ^ (-(tmp & 1) & 0xEDB88320);
|
|
crc = (crc >>> 8) ^ tmp;
|
|
}
|
|
|
|
public inline function update(b:haxe.io.Bytes, pos, len) {
|
|
var b = b.getData();
|
|
for (i in pos...pos + len) {
|
|
var tmp = (crc ^ haxe.io.Bytes.fastGet(b, i)) & 0xFF;
|
|
for (j in 0...8)
|
|
tmp = (tmp >>> 1) ^ (-(tmp & 1) & 0xEDB88320);
|
|
crc = (crc >>> 8) ^ tmp;
|
|
}
|
|
}
|
|
|
|
public inline function get() {
|
|
return crc ^ 0xFFFFFFFF;
|
|
}
|
|
|
|
/**
|
|
Calculates the CRC32 of the given data bytes
|
|
**/
|
|
public static function make(data:haxe.io.Bytes):Int {
|
|
var c = new Crc32();
|
|
c.update(data, 0, data.length);
|
|
return c.get();
|
|
}
|
|
}
|