writeuint64be v1.0.3

writeUInt64BE

Safely create 64 bit buffers or add them to an existing buffer

Writes number to buf at the specified offset with specified big endian format. Number should be a valid signed 64-bit integer.

In computing. The number 9,223,372,036,854,775,807, equivalent to the hexadecimal value 7FFF,FFFF,FFFF,FFFF16, is the maximum value for a 64-bit signed integer in computing.

value is interpreted and written as a two's complement signed integer.

writeInt32BE(buf, number, offest)

• buf <Buffer> Original buffer to edit or change
• number <Integer> The signed integer to convert to a 64bit buffer
• offset <Integer> Where to start writing. Must satisfy: 0 <= offset <= buf.length - 8

Install

npm install writeuint64be

Usage

const Buffer = require('buffer').Buffer;
const writeUInt64BE = require('writeUInt64BE');

// First example, writing to a buffer at a specified location:

let buf = new Buffer(16);
buf.fill(0);

buf.writeUInt32BE(0x417, 0);
buf.writeUInt32BE(0x27101980, 4);
writeUInt64BE(buf, 123456789, 8);

console.log(buf); // <Buffer 00 00 04 17 27 10 19 80 00 00 00 00 07 5b cd 15>

// Second example, concatenating to the original buffer:

let buf2 = new Buffer(8);
buf2.fill(0);

buf2.writeUInt32BE(0x417, 0);
buf2.writeUInt32BE(0x27101980, 4);
buf2 = writeUInt64BE(buf2, 123456789);

console.log(buf2); // <Buffer 00 00 04 17 27 10 19 80 00 00 00 00 07 5b cd 15>