oBusk/read-bigint

👓💯 Packages of Node Buffer methods readBigInt64BE, readBigInt64LE, readBigUInt64BE, and readBigUInt64LE

Read BigInt

👓💯 Read Unsigned/Signed Big/Little-Endian BigInt from Buffer

Install

npm install read-bigint

• Supported Node versions aim to be Latest current and LTS as well as trying to keep up to date with the latest supported node in Google cloud functions.

Usage

import {
    readBigInt64BE,
    readBigInt64LE,
    readBigUInt64BE,
    readBigUInt64LE,
} from "read-bigint";

const buffer = Buffer.from([
    0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88,
]);

readBigInt64BE(buffer, /* offset */ 1); // => 1234605616436508552n
readBigInt64LE(buffer, /* offset */ 1); // => -8613303245920329199n
readBigUInt64BE(buffer, /* offset */ 1); // => 1234605616436508552n
readBigUInt64LE(buffer, /* offset */ 1); // => 9833440827789222417n

The purpose of this package is to be able to read native BigInt from native Buffer. This is mostly useful when targeting Node 10 (LTS Dubnium), which supports BigInt, but does not have native methods for reading BigInt from Buffer. On Node 12 or any later version of Node, you should use the native Buffer methods instead.

API

Each of the exported methods is a direct copy of the Native Buffer.readBigInt() methods.

• readBigInt64BE(buffer, offset)

  Copy of native buffer.readBigInt64BE(offset)

• readBigInt64LE(buffer, offset)

  Copy of native buffer.readBigInt64LE(offset)

• readBigUInt64BE(buffer, offset)

  Copy of native buffer.readBigUInt64LE(offset)

• readBigUInt64BE(buffer, offset)

  Copy of native buffer.readBigUInt64LE(offset)

License

MIT