crc-32 - npm Package Compare versions

Comparing version 0.4.0 to 0.4.1

crc32.js

 /* crc32.js (C) 2014-present SheetJS -- http://sheetjs.com */
 /* vim: set ts=2: */
+/*exported CRC32 */
 var CRC32;
 (function (factory) {
+	/*jshint ignore:start */
 	if(typeof DO_NOT_EXPORT_CRC === 'undefined') {
@@ -20,5 +22,7 @@ if('object' === typeof exports) {
 	}
+	/*jshint ignore:end */
 }(function(CRC32) {
-CRC32.version = '0.4.0';
+CRC32.version = '0.4.1';
 /* see perf/crc32table.js */
+/*global Int32Array */
 function signed_crc_table() {
@@ -43,14 +47,14 @@ var c = 0, table = new Array(256);
 
-var table = signed_crc_table();
-/* charCodeAt is the best approach for binary strings */
+var T = signed_crc_table();
+/*global Buffer */
 var use_buffer = typeof Buffer !== 'undefined';
 function crc32_bstr(bstr) {
 	if(bstr.length > 32768) if(use_buffer) return crc32_buf_8(new Buffer(bstr));
-	var crc = -1, L = bstr.length - 1;
+	var C = -1, L = bstr.length - 1;
 	for(var i = 0; i < L;) {
-		crc =  table[(crc ^ bstr.charCodeAt(i++)) & 0xFF] ^ (crc >>> 8);
-		crc =  table[(crc ^ bstr.charCodeAt(i++)) & 0xFF] ^ (crc >>> 8);
+		C = (C>>>8) ^ T[(C^bstr.charCodeAt(i++))&0xFF];
+		C = (C>>>8) ^ T[(C^bstr.charCodeAt(i++))&0xFF];
 	}
-	if(i === L) crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i)) & 0xFF];
-	return crc ^ -1;
+	if(i === L) C = (C>>>8) ^ T[(C ^ bstr.charCodeAt(i))&0xFF];
+	return C ^ -1;
 }
@@ -60,51 +64,53 @@
 	if(buf.length > 10000) return crc32_buf_8(buf);
-	for(var crc = -1, i = 0, L=buf.length-3; i < L;) {
-		crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
-		crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
-		crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
-		crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
+	var C = -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) crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
-	return crc ^ -1;
+	while(i < L+3) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
+	return C ^ -1;
 }
 
 function crc32_buf_8(buf) {
-	for(var crc = -1, i = 0, L=buf.length-7; i < L;) {
-		crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
-		crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
-		crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
-		crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
-		crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
-		crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
-		crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
-		crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
+	var C = -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) crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
-	return crc ^ -1;
+	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) {
-	for(var crc = -1, i = 0, L=str.length, c, d; i < L;) {
+	var C = -1;
+	for(var i = 0, L=str.length, c, d; i < L;) {
 		c = str.charCodeAt(i++);
 		if(c < 0x80) {
-			crc = (crc >>> 8) ^ table[(crc ^ c) & 0xFF];
+			C = (C>>>8) ^ T[(C ^ c)&0xFF];
 		} else if(c < 0x800) {
-			crc = (crc >>> 8) ^ table[(crc ^ (192|((c>>6)&31))) & 0xFF];
-			crc = (crc >>> 8) ^ table[(crc ^ (128|(c&63))) & 0xFF];
+			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;
-			crc = (crc >>> 8) ^ table[(crc ^ (240|((c>>8)&7))) & 0xFF];
-			crc = (crc >>> 8) ^ table[(crc ^ (128|((c>>2)&63))) & 0xFF];
-			crc = (crc >>> 8) ^ table[(crc ^ (128|((d>>6)&15)|((c&3)<<4))) & 0xFF];
-			crc = (crc >>> 8) ^ table[(crc ^ (128|(d&63))) & 0xFF];
+			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 {
-			crc = (crc >>> 8) ^ table[(crc ^ (224|((c>>12)&15))) & 0xFF];
-			crc = (crc >>> 8) ^ table[(crc ^ (128|((c>>6)&63))) & 0xFF];
-			crc = (crc >>> 8) ^ table[(crc ^ (128|(c&63))) & 0xFF];
+			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 crc ^ -1;
+	return C ^ -1;
 }
-CRC32.table = table;
+CRC32.table = T;
 CRC32.bstr = crc32_bstr;
@@ -111,0 +117,0 @@ CRC32.buf = crc32_buf;

package.json

 {
 	"name": "crc-32",
-	"version": "0.4.0",
+	"version": "0.4.1",
 	"author": "sheetjs",
 	"description": "Pure-JS CRC-32",
 	"keywords": [ "crc32", "checksum", "crc" ],
+	"bin": {
+		"crc32": "./bin/crc32.njs"
+	},
 	"main": "./crc32",
+	"dependencies": {
+		"concat-stream":"",
+		"exit-on-epipe":""
+	},
 	"devDependencies": {
-		"codepage":"",
 		"mocha":"",
-		"uglify-js":""
+		"codepage":""
 	},
@@ -23,2 +29,3 @@ "repository": { "type":"git", "url":"git://github.com/SheetJS/js-crc32.git" },
 	},
+	"files": ["crc32.js", "bin/crc32.njs", "LICENSE", "README.md"],
 	"bugs": { "url": "https://github.com/SheetJS/js-crc32/issues" },
@@ -25,0 +32,0 @@ "license": "Apache-2.0",

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Found 1 instance in 1 package

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Package has a dependency with a floating version range. This can cause issues if the dependency publishes a new major version.

Found 2 instances in 1 package

Major refactor

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Found 1 instance in 1 package

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Improved metrics

Dev dependency count

2

decreased by-33.33%

Worsened metrics

Total package byte prevSize

5659

decreased by-50%

Dependency count

2

increased byInfinity%

Number of package files

4

decreased by-20%

Lines of code

110

decreased by-48.84%

Number of medium quality alerts

3

increased byInfinity%

Number of lines in readme file

0

decreased by-100%

Number of medium supply chain risk alerts

1

increased byInfinity%

Dependency changes

• + Addedconcat-stream@

• + Addedexit-on-epipe@

• + Addedbuffer-from@1.1.2(transitive)

• + Addedconcat-stream@2.0.0(transitive)

• + Addedexit-on-epipe@1.0.1(transitive)

• + Addedinherits@2.0.4(transitive)

• + Addedreadable-stream@3.6.2(transitive)

• + Addedsafe-buffer@5.2.1(transitive)

• + Addedstring_decoder@1.3.0(transitive)

• + Addedtypedarray@0.0.6(transitive)

• + Addedutil-deprecate@1.0.2(transitive)