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Node.js Buffer.readIntBE() Method
Last Updated :
13 Oct, 2021
The
Buffer.readIntBE() method is used to read the number of bytes for a buffer at a given offset and interprets the result as a two's complement signed value.
Syntax:
buffer.readIntBE( offset, byteLen )
Parameters: This method accepts two parameters as mentioned above and described below:
offset: It specifies the position of buffer object. It represents the number of bytes to skip before starting to read. The value of offset lies between the range
0 to buffer.length - byteLen.
byteLen: It is an integer value that indicates the number of bytes that are to be read from the given offset. This parameter value lies between
0 and 6.
Return value: It returns an
integer value with byteLen bytes from the specified offset in big endian.
Example 1:
javascript
// Node.js program to demonstrate the
// buffer.readIntBE(offset, bytelen) method
const buff = Buffer.from([0x11, 0x12, 0x34, 0x56, 0x89, 0xcd]);
console.log(buff.readIntBE(0, 5).toString(16));
console.log(buff.readIntBE(0, 4).toString(16));
1112345689
11123456
Example 2:
javascript
// Node.js program to demonstrate the
// buffer.readIntBE(offset, bytelen) method
const buff = Buffer.from([0x11, 0x12, 0x34, 0x56, 0x89, 0xcd]);
console.log(buff.readIntBE(4, 6).toString(16));
console.log(buff.readIntBE(3, 0).toString(16));
buffer.js:831
throw new RangeError('Index out of range');
^
RangeError: Index out of range
at checkOffset (buffer.js:831:11)
at Buffer.readIntBE (buffer.js:938:5)
at Object. (/home/cg/root/8545664/main.js:8:17)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:389:7)
The above example shows the error because its parameters are not in the valid range.
Note:
- To get the values in Little endian format you can use Buffer.readIntLE() method.
- The above program will compile and run by using the
node index.js command.
Reference: https://nodejs.org/api/buffer.html#buffer_buf_readintbe_offset_bytelength
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