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CRC32C

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SheetJS 2022-01-24 03:14:46 -05:00
parent 49af36393a
commit 9f97346755
5 changed files with 256 additions and 4 deletions
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5
Makefile
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@ -1,7 +1,7 @@
LIB=crc32
REQS=
ADDONS=
AUXTARGETS=demo/browser.js
AUXTARGETS=crc32c.js demo/browser.js
CMDS=bin/crc32.njs
HTMLLINT=index.html
@ -30,6 +30,9 @@ bits/01_version.js: package.json
clean: clean-baseline ## Remove targets and build artifacts
rm -f $(TARGET) $(FLOWTARGET)
crc32c.flow.js: crc32.flow.js
cat $^ | sed 's/-306674912/-2097792136/g' > $@
## Testing
.PHONY: test mocha

3
bin/crc32.njs
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@ -20,6 +20,7 @@ function help()/*:number*/ {
" -u, --unsigned print result with format `%u`",
" -x, --hex print result with format `%0.8x`",
" -X, --HEX print result with format `%0.8X`",
" -c, --crc32c use CRC32C (Castagnoli)",
" -F, --format=<s> use specified printf format",
"",
"Set filename = '-' or pipe data into crc32 to read from stdin",
@ -51,6 +52,8 @@ for(var i = 0; i < args.length; ++i) {
case "--help": case "-h": process.exit(help()); break;
case "--version": case "-V": process.exit(version()); break;
case "--crc32c": case "-c": try { X = require('../crc32c'); } catch(e) { X = require('crc-32/crc32c'); } break;
case "--signed": case "-d": fmt = "%d"; break;
case "--unsigned": case "-u": fmt = "%u"; break;
case "--hex": case "-x": fmt = "%0.8x"; break;

127
crc32c.flow.js Normal file
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@ -0,0 +1,127 @@
/* crc32.js (C) 2014-present SheetJS -- http://sheetjs.com */
/* vim: set ts=2: */
/*exported CRC32 */
/*:: declare var DO_NOT_EXPORT_CRC:?boolean; */
/*:: declare function define(cb:()=>any):void; */
var CRC32/*:CRC32Module*/;
(function (factory/*:(a:any)=>void*/)/*:void*/ {
/*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/*:CRC32Module*/ = /*::(*/{}/*:: :any)*/;
factory(module);
return module;
});
} else {
factory(CRC32 = /*::(*/{}/*:: :any)*/);
}
} else {
factory(CRC32 = /*::(*/{}/*:: :any)*/);
}
/*eslint-enable */
/*jshint ignore:end */
}(function(CRC32/*:CRC32Module*/) {
CRC32.version = '1.2.0';
/*::
type CRC32Type = number;
type ABuf = Array<number> | Buffer | Uint8Array;
type CRC32TableType = Array<number> | Int32Array;
*/
/* see perf/crc32table.js */
/*global Int32Array */
function signed_crc_table()/*:CRC32TableType*/ {
var c = 0, table/*:Array<number>*/ = new Array(256);
for(var n =0; n != 256; ++n){
c = n;
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
table[n] = c;
}
return typeof Int32Array !== 'undefined' ? new Int32Array(table) : table;
}
var T = signed_crc_table();
/*# charCodeAt is the best approach for binary strings */
function crc32_bstr(bstr/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -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/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
if(buf.length > 10000) return crc32_buf_8(buf, seed);
var C = seed/*:: ? 0 : 0 */ ^ -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/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -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;
}
/*# much much faster to intertwine utf8 and crc */
function crc32_str(str/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -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;
}));

118
crc32c.js Normal file
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@ -0,0 +1,118 @@
/* 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) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (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;
}));

7
package.json
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@ -5,12 +5,13 @@
"description": "Pure-JS CRC-32",
"keywords": [ "crc", "crc32", "checksum" ],
"bin": {
"crc32": "./bin/crc32.njs"
"crc32": "bin/crc32.njs"
},
"main": "crc32.js",
"types": "types/index.d.ts",
"typesVersions": { "*": { "*": ["types/index.d.ts" ] } },
"dependencies": {
"printj": "~1.1.0",
"printj": "~1.3.1",
"exit-on-epipe": "~1.0.1"
},
"devDependencies": {
@ -35,7 +36,7 @@
}
},
"homepage": "http://sheetjs.com/opensource",
"files": ["crc32.js", "bin/crc32.njs", "LICENSE", "README.md", "types/index.d.ts", "types/*.json"],
"files": ["crc32.js", "crc32c.js", "bin/crc32.njs", "LICENSE", "README.md", "types/index.d.ts", "types/*.json"],
"bugs": { "url": "https://github.com/SheetJS/js-crc32/issues" },
"license": "Apache-2.0",
"engines": { "node": ">=0.8" }