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Viewing file:     crc32.js (3.29 KB)      -rw-r--r--

/* crc32.js (C) 2014-present SheetJS -- http://sheetjs.com */
/* vim: set ts=2: */
/*exported CRC32 */
var CRC32;
(function (factory) {
	/*jshint ignore:start */
	/*eslint-disable */
	if(typeof DO_NOT_EXPORT_CRC === 'undefined') {
		if('object' === typeof exports) {
			factory(exports);
		} else if ('function' === typeof define && define.amd) {
			define(function () {
				var module = {};
				factory(module);
				return module;
			});
		} else {
			factory(CRC32 = {});
		}
	} else {
		factory(CRC32 = {});
	}
	/*eslint-enable */
	/*jshint ignore:end */
}(function(CRC32) {
CRC32.version = '1.2.0';
/* see perf/crc32table.js */
/*global Int32Array */
function signed_crc_table() {
	var c = 0, table = new Array(256);

	for(var n =0; n != 256; ++n){
		c = n;
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		table[n] = c;
	}

	return typeof Int32Array !== 'undefined' ? new Int32Array(table) : table;
}

var T = signed_crc_table();
function crc32_bstr(bstr, seed) {
	var C = seed ^ -1, L = bstr.length - 1;
	for(var i = 0; i < L;) {
		C = (C>>>8) ^ T[(C^bstr.charCodeAt(i++))&0xFF];
		C = (C>>>8) ^ T[(C^bstr.charCodeAt(i++))&0xFF];
	}
	if(i === L) C = (C>>>8) ^ T[(C ^ bstr.charCodeAt(i))&0xFF];
	return C ^ -1;
}

function crc32_buf(buf, seed) {
	if(buf.length > 10000) return crc32_buf_8(buf, seed);
	var C = seed ^ -1, L = buf.length - 3;
	for(var i = 0; i < L;) {
		C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
		C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
		C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
		C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
	}
	while(i < L+3) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
	return C ^ -1;
}

function crc32_buf_8(buf, seed) {
	var C = seed ^ -1, L = buf.length - 7;
	for(var i = 0; i < L;) {
		C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
		C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
		C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
		C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
		C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
		C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
		C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
		C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
	}
	while(i < L+7) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
	return C ^ -1;
}

function crc32_str(str, seed) {
	var C = seed ^ -1;
	for(var i = 0, L=str.length, c, d; i < L;) {
		c = str.charCodeAt(i++);
		if(c < 0x80) {
			C = (C>>>8) ^ T[(C ^ c)&0xFF];
		} else if(c < 0x800) {
			C = (C>>>8) ^ T[(C ^ (192|((c>>6)&31)))&0xFF];
			C = (C>>>8) ^ T[(C ^ (128|(c&63)))&0xFF];
		} else if(c >= 0xD800 && c < 0xE000) {
			c = (c&1023)+64; d = str.charCodeAt(i++)&1023;
			C = (C>>>8) ^ T[(C ^ (240|((c>>8)&7)))&0xFF];
			C = (C>>>8) ^ T[(C ^ (128|((c>>2)&63)))&0xFF];
			C = (C>>>8) ^ T[(C ^ (128|((d>>6)&15)|((c&3)<<4)))&0xFF];
			C = (C>>>8) ^ T[(C ^ (128|(d&63)))&0xFF];
		} else {
			C = (C>>>8) ^ T[(C ^ (224|((c>>12)&15)))&0xFF];
			C = (C>>>8) ^ T[(C ^ (128|((c>>6)&63)))&0xFF];
			C = (C>>>8) ^ T[(C ^ (128|(c&63)))&0xFF];
		}
	}
	return C ^ -1;
}
CRC32.table = T;
// $FlowIgnore
CRC32.bstr = crc32_bstr;
// $FlowIgnore
CRC32.buf = crc32_buf;
// $FlowIgnore
CRC32.str = crc32_str;
}));