crc64_ecma182.js's Introduction

CRC64-ECMA182.js

Pure JavaScript implement of CRC64-ECMA182 for Node.js.

This package can be used as verify Ali-OSS file.

Installation

$ npm install --save crc64-ecma182.js

Usage

Calculate a Buffer

You can calculate the CRC64-ECMA182 value for a Node.js buffer or string:

crc64.crc64(buff[, prev]);

Parameters:
- buff: the buffer or string to be calculated;
- [prev]: if exists, prev indicates the previous CRC64-ECMA182 value; (optional)
Returns: the result string indicates a uint64 value that calculated.

const crc64 = require("crc64-ecma182.js");
const ret1 = crc64.crc64("123456789");
const ret2 = crc64.crc64(new Buffer("123456789"));
const ret3 = crc64.crc64("123456789", "0");
const ret4 = crc64.crc64(new Buffer("123456789"), "0");

// ret1 ~ ret2 all equals to:
//
//   '11051210869376104954'

Calculate a file

You can calculate the CRC64-ECMA182 value for a file:

crc64.crc64File(filename, callback);

Parameters:
- filename: the file's name that to be calculated;
- callback: the callback function which receives two arguments err and ret.

crc64.crc64File(path.join(__dirname, "pic.png"), function(err, ret) {
    console.log(err, ret);

    // a possible result:
    //
    //   undefined 5178350320981835788
});

Contribution

You're welcome to make pull-requests.

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crc64_ecma182.js's Issues

获取crc64时，报内存不足

错误信息：Aborted(Cannot enlarge memory arrays to size 35950592 bytes (OOM). Either (1) compile with -sINITIAL_MEMORY=X with X higher than the current value 16777216, (2) compile with -sALLOW_MEMORY_GROWTH which allows increasing the size at runtime, or (3) if you want malloc to return NULL (0) instead of this abort, compile with -sABORTING_MALLOC=0)