buf.readIntBE(offset, byteLength)

版本历史
版本变更
v10.0.0

删除了 noAssert 并且不再将偏移量和 byteLength 隐式强制转换为 uint32。

v0.11.15

新增于: v0.11.15

  • offset <integer> 开始读取之前要跳过的字节数。 必须满足 0 <= offset <= buf.length - byteLength。
  • byteLength <integer> 要读取的字节数。 必须满足 0 < byteLength <= 6。
  • 返回: <integer>

从指定的 offset 处的 buf 读取 byteLength 个字节，并将结果解释为支持最高 48 位精度的大端序、二进制补码有符号值。

import { Buffer } from 'node:buffer';

const buf = Buffer.from([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);

console.log(buf.readIntBE(0, 6).toString(16));
// 打印: 1234567890ab
console.log(buf.readIntBE(1, 6).toString(16));
// 抛出 ERR_OUT_OF_RANGE。
console.log(buf.readIntBE(1, 0).toString(16));
// 抛出 ERR_OUT_OF_RANGE。const { Buffer } = require('node:buffer');

const buf = Buffer.from([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);

console.log(buf.readIntBE(0, 6).toString(16));
// 打印: 1234567890ab
console.log(buf.readIntBE(1, 6).toString(16));
// 抛出 ERR_OUT_OF_RANGE。
console.log(buf.readIntBE(1, 0).toString(16));
// 抛出 ERR_OUT_OF_RANGE。
History
VersionChanges
v10.0.0

Removed noAssert and no implicit coercion of the offset and byteLength to uint32 anymore.

v0.11.15

Added in: v0.11.15

  • offset <integer> Number of bytes to skip before starting to read. Must satisfy 0 <= offset <= buf.length - byteLength.
  • byteLength <integer> Number of bytes to read. Must satisfy 0 < byteLength <= 6.
  • Returns: <integer>

Reads byteLength number of bytes from buf at the specified offset and interprets the result as a big-endian, two's complement signed value supporting up to 48 bits of accuracy.

import { Buffer } from 'node:buffer';

const buf = Buffer.from([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);

console.log(buf.readIntBE(0, 6).toString(16));
// Prints: 1234567890ab
console.log(buf.readIntBE(1, 6).toString(16));
// Throws ERR_OUT_OF_RANGE.
console.log(buf.readIntBE(1, 0).toString(16));
// Throws ERR_OUT_OF_RANGE.const { Buffer } = require('node:buffer');

const buf = Buffer.from([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);

console.log(buf.readIntBE(0, 6).toString(16));
// Prints: 1234567890ab
console.log(buf.readIntBE(1, 6).toString(16));
// Throws ERR_OUT_OF_RANGE.
console.log(buf.readIntBE(1, 0).toString(16));
// Throws ERR_OUT_OF_RANGE.