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js-crc32
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ESM build

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SheetJS 2022-08-13 00:29:46 -04:00
parent 02389a3823
commit 3bd21324db
8 changed files with 265 additions and 4 deletions
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11
Makefile
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@ -12,10 +12,13 @@ FLOWTARGET=$(LIB).flow.js
FLOWTGTS=$(TARGET) $(AUXTARGETS)
CLOSURE=/usr/local/lib/node_modules/google-closure-compiler/compiler.jar
ESMJSTGT=crc32.mjs
ESMJSDEPS=$(shell cat misc/mjs.lst)
## Main Targets
.PHONY: all
all: $(TARGET) $(AUXTARGETS) ## Build library and auxiliary scripts
all: $(TARGET) $(AUXTARGETS) $(ESMJSTGT) crc32c.mjs ## Build library and auxiliary scripts
$(FLOWTGTS): %.js : %.flow.js
node -e 'process.stdout.write(require("fs").readFileSync("$<","utf8").replace(/^[ \t]*\/\*[:#][^*]*\*\/\s*(\n)?/gm,"").replace(/\/\*[:#][^*]*\*\//gm,""))' > $@
@ -23,6 +26,9 @@ $(FLOWTGTS): %.js : %.flow.js
$(FLOWTARGET): $(DEPS)
cat $^ | tr -d '\15\32' > $@
$(ESMJSTGT): $(ESMJSDEPS)
cat $^ | tr -d '\15\32' > $@
bits/01_version.js: package.json
echo "$(ULIB).version = '"`grep version package.json | awk '{gsub(/[^0-9a-z\.-]/,"",$$2); print $$2}'`"';" > $@
@ -33,6 +39,9 @@ clean: clean-baseline ## Remove targets and build artifacts
crc32c.flow.js: crc32.flow.js
cat $^ | sed 's/-306674912/-2097792136/g; s/CRC32\([ \/\.]\)/CRC32C\1/g' > $@
crc32c.mjs: crc32.mjs
cat $^ | sed 's/-306674912/-2097792136/g; s/CRC32\([ \/\.]\)/CRC32C\1/g' > $@
## Testing
.PHONY: test mocha

35
README.md
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@ -28,12 +28,18 @@ checksum for a specified file or standard input.
## Integration
Using NodeJS or a bundler:
Using NodeJS or a bundler with `require`:
```js
var CRC32 = require("crc-32");
```
Using NodeJS or a bundler with `import`:
```js
import { bstr, buf, str } from "crc-32";
```
In the browser, the `crc32.js` script can be loaded directly:
```html
@ -55,6 +61,12 @@ Using NodeJS or a bundler:
var CRC32C = require("crc-32/crc32c");
```
Using NodeJS or a bundler with `import`:
```js
import { bstr, buf, str } from "crc-32/crc32c";
```
In the browser, the `crc32c.js` script can be loaded directly:
```html
@ -71,7 +83,7 @@ desirable. To prevent the behavior, define `DO_NOT_EXPORT_CRC`.
In all cases, the relevant function takes an argument representing data and an
optional second argument representing the starting "seed" (for rolling CRC).
The return value is a signed 32-bit integer.
**The return value is a signed 32-bit integer!**
- `CRC32.buf(byte array or buffer[, seed])` assumes the argument is a sequence
of 8-bit unsigned integers (nodejs `Buffer`, `Uint8Array` or array of bytes).
@ -130,6 +142,25 @@ crc32 = CRC32.buf(Buffer.from(bstr, "binary"), 0);
This does not apply to browser `Buffer` shims, and thus is not implemented in
the library directly.
### Signed Integers
Unconventional for a CRC32 checksum, this library uses signed 32-bit integers.
This is for performance reasons. Standard JS operators can convert between
signed and unsigned 32-bit integers:
```js
CRC32.str("SheetJS") // -1647298270 (signed)
CRC32.str("SheetJS") >>> 0 // 2647669026 (unsigned)
(CRC32.str("SheetJS")>>>0).toString(16) // "9dd03922" (hex)
(2647669026 | 0) // -1647298270
```
- `x >>> 0` converts a number value to unsigned 32-bit integer.
- `x | 0` converts a number value to signed 32-bit integer.
## Testing
`make test` will run the nodejs-based test.

95
crc32.mjs Normal file
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@ -0,0 +1,95 @@
/*! crc32.js (C) 2014-present SheetJS -- http://sheetjs.com */
/* vim: set ts=2: */
var CRC32 = {};
CRC32.version = '1.2.2';
/*::
type CRC32Type = number;
type ABuf = Array<number> | Buffer | Uint8Array;
type CRC32TableType = Array<number> | Int32Array;
*/
/*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) ? (-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 T0 = signed_crc_table();
function slice_by_16_tables(T) {
var c = 0, v = 0, n = 0, table/*:Array<number>*/ = typeof Int32Array !== 'undefined' ? new Int32Array(4096) : new Array(4096) ;
for(n = 0; n != 256; ++n) table[n] = T[n];
for(n = 0; n != 256; ++n) {
v = T[n];
for(c = 256 + n; c < 4096; c += 256) v = table[c] = (v >>> 8) ^ T[v & 0xFF];
}
var out = [];
for(n = 1; n != 16; ++n) out[n - 1] = typeof Int32Array !== 'undefined' ? table.subarray(n * 256, n * 256 + 256) : table.slice(n * 256, n * 256 + 256);
return out;
}
var TT = slice_by_16_tables(T0);
var T1 = TT[0], T2 = TT[1], T3 = TT[2], T4 = TT[3], T5 = TT[4];
var T6 = TT[5], T7 = TT[6], T8 = TT[7], T9 = TT[8], Ta = TT[9];
var Tb = TT[10], Tc = TT[11], Td = TT[12], Te = TT[13], Tf = TT[14];
function crc32_bstr(bstr/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1;
for(var i = 0, L = bstr.length; i < L;) C = (C>>>8) ^ T0[(C^bstr.charCodeAt(i++))&0xFF];
return ~C;
}
function crc32_buf(B/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1, L = B.length - 15, i = 0;
for(; i < L;) C =
Tf[B[i++] ^ (C & 255)] ^
Te[B[i++] ^ ((C >> 8) & 255)] ^
Td[B[i++] ^ ((C >> 16) & 255)] ^
Tc[B[i++] ^ (C >>> 24)] ^
Tb[B[i++]] ^ Ta[B[i++]] ^ T9[B[i++]] ^ T8[B[i++]] ^
T7[B[i++]] ^ T6[B[i++]] ^ T5[B[i++]] ^ T4[B[i++]] ^
T3[B[i++]] ^ T2[B[i++]] ^ T1[B[i++]] ^ T0[B[i++]];
L += 15;
while(i < L) C = (C>>>8) ^ T0[(C^B[i++])&0xFF];
return ~C;
}
function crc32_str(str/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1;
for(var i = 0, L = str.length, c = 0, d = 0; i < L;) {
c = str.charCodeAt(i++);
if(c < 0x80) {
C = (C>>>8) ^ T0[(C^c)&0xFF];
} else if(c < 0x800) {
C = (C>>>8) ^ T0[(C ^ (192|((c>>6)&31)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|(c&63)))&0xFF];
} else if(c >= 0xD800 && c < 0xE000) {
c = (c&1023)+64; d = str.charCodeAt(i++)&1023;
C = (C>>>8) ^ T0[(C ^ (240|((c>>8)&7)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|((c>>2)&63)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|((d>>6)&15)|((c&3)<<4)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|(d&63)))&0xFF];
} else {
C = (C>>>8) ^ T0[(C ^ (224|((c>>12)&15)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|((c>>6)&63)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|(c&63)))&0xFF];
}
}
return ~C;
}
export const version = CRC32.version;
export const table = T0;
export const bstr = crc32_bstr;
export const buf = crc32_buf;
export const str = crc32_str;

95
crc32c.mjs Normal file
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@ -0,0 +1,95 @@
/*! crc32.js (C) 2014-present SheetJS -- http://sheetjs.com */
/* vim: set ts=2: */
var CRC32C = {};
CRC32C.version = '1.2.2';
/*::
type CRC32Type = number;
type ABuf = Array<number> | Buffer | Uint8Array;
type CRC32TableType = Array<number> | Int32Array;
*/
/*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 T0 = signed_crc_table();
function slice_by_16_tables(T) {
var c = 0, v = 0, n = 0, table/*:Array<number>*/ = typeof Int32Array !== 'undefined' ? new Int32Array(4096) : new Array(4096) ;
for(n = 0; n != 256; ++n) table[n] = T[n];
for(n = 0; n != 256; ++n) {
v = T[n];
for(c = 256 + n; c < 4096; c += 256) v = table[c] = (v >>> 8) ^ T[v & 0xFF];
}
var out = [];
for(n = 1; n != 16; ++n) out[n - 1] = typeof Int32Array !== 'undefined' ? table.subarray(n * 256, n * 256 + 256) : table.slice(n * 256, n * 256 + 256);
return out;
}
var TT = slice_by_16_tables(T0);
var T1 = TT[0], T2 = TT[1], T3 = TT[2], T4 = TT[3], T5 = TT[4];
var T6 = TT[5], T7 = TT[6], T8 = TT[7], T9 = TT[8], Ta = TT[9];
var Tb = TT[10], Tc = TT[11], Td = TT[12], Te = TT[13], Tf = TT[14];
function crc32_bstr(bstr/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1;
for(var i = 0, L = bstr.length; i < L;) C = (C>>>8) ^ T0[(C^bstr.charCodeAt(i++))&0xFF];
return ~C;
}
function crc32_buf(B/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1, L = B.length - 15, i = 0;
for(; i < L;) C =
Tf[B[i++] ^ (C & 255)] ^
Te[B[i++] ^ ((C >> 8) & 255)] ^
Td[B[i++] ^ ((C >> 16) & 255)] ^
Tc[B[i++] ^ (C >>> 24)] ^
Tb[B[i++]] ^ Ta[B[i++]] ^ T9[B[i++]] ^ T8[B[i++]] ^
T7[B[i++]] ^ T6[B[i++]] ^ T5[B[i++]] ^ T4[B[i++]] ^
T3[B[i++]] ^ T2[B[i++]] ^ T1[B[i++]] ^ T0[B[i++]];
L += 15;
while(i < L) C = (C>>>8) ^ T0[(C^B[i++])&0xFF];
return ~C;
}
function crc32_str(str/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1;
for(var i = 0, L = str.length, c = 0, d = 0; i < L;) {
c = str.charCodeAt(i++);
if(c < 0x80) {
C = (C>>>8) ^ T0[(C^c)&0xFF];
} else if(c < 0x800) {
C = (C>>>8) ^ T0[(C ^ (192|((c>>6)&31)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|(c&63)))&0xFF];
} else if(c >= 0xD800 && c < 0xE000) {
c = (c&1023)+64; d = str.charCodeAt(i++)&1023;
C = (C>>>8) ^ T0[(C ^ (240|((c>>8)&7)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|((c>>2)&63)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|((d>>6)&15)|((c&3)<<4)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|(d&63)))&0xFF];
} else {
C = (C>>>8) ^ T0[(C ^ (224|((c>>12)&15)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|((c>>6)&63)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|(c&63)))&0xFF];
}
}
return ~C;
}
export const version = CRC32C.version;
export const table = T0;
export const bstr = crc32_bstr;
export const buf = crc32_buf;
export const str = crc32_str;

3
misc/00_header.js Normal file
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@ -0,0 +1,3 @@
/*! crc32.js (C) 2014-present SheetJS -- http://sheetjs.com */
/* vim: set ts=2: */
var CRC32 = {};

5
misc/99_footer.js Normal file
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@ -0,0 +1,5 @@
export const version = CRC32.version;
export const table = T0;
export const bstr = crc32_bstr;
export const buf = crc32_buf;
export const str = crc32_str;

6
misc/mjs.lst Normal file
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@ -0,0 +1,6 @@
misc/00_header.js
bits/01_version.js
bits/10_types.js
bits/20_crctable.js
bits/40_crc.js
misc/99_footer.js

19
package.json
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@ -8,8 +8,25 @@
"crc32": "bin/crc32.njs"
},
"main": "crc32.js",
"module": "crc32.mjs",
"types": "types/index.d.ts",
"typesVersions": { "*": { "*": ["types/index.d.ts" ] } },
"exports": {
".": {
"import": "./crc32.mjs",
"require": "./crc32.js"
},
"./crc32c": {
"import": "./crc32c.mjs",
"require": "./crc32c.js"
},
"./crc32.mjs": {
"import": "./crc32.mjs"
},
"./crc32c.mjs": {
"import": "./crc32c.mjs"
}
},
"dependencies": {
},
"devDependencies": {
@ -36,7 +53,7 @@
}
},
"homepage": "https://sheetjs.com/",
"files": ["crc32.js", "crc32c.js", "bin/crc32.njs", "LICENSE", "README.md", "types/index.d.ts", "types/*.json"],
"files": ["crc32.js", "crc32c.js", "crc32.mjs", "crc32c.mjs", "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" }