Node.js Buffer.readIntLE() Method
The Buffer.readIntLE() method is used to read number of bytes from a buffer at a given offset and interprets the result as a two’s complement signed value.
Syntax:
buffer.readIntLE( offset, byteLen )
Parameters: This method accepts two parameter as mentioned above and described below:
offset: It specifies the position of buffer object. It represents number of bytes to skip before starting to read. It lies within 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 with between 0 and 6.
Return value: It returns an integer value with byteLen bytes from the specified offset in little endian.
Example 1:
// Node.js program to demonstrate the // buffer.readIntLE( offset, byteLen ) method const buff = Buffer.from([0x11, 0x12, 0x34, 0x56, 0x89, 0xcd]); console.log(buff.readIntLE(0, 5).toString(16)); console.log(buff.readIntLE(0, 4).toString(16)); |
Output:
-76a9cbedef 56341211
Example 2:
// Node program to demonstrate the // buffer.readIntLE( offset, bytelen ) method const buff = Buffer.from([0x11, 0x12, 0x34, 0x56, 0x89, 0xcd]); console.log(buff.readIntLE(4, 6).toString(16)); console.log(buff.readIntLE(3, 0).toString(16)); |
Output:
buffer.js:831 throw new RangeError('Index out of range'); ^ RangeError: Index out of range at checkOffset (buffer.js:831:11) at Buffer.readIntLE (buffer.js:918:5) 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 Big endian format you can use Buffer.readIntBE() method.
- The above program will compile and run by using the
node index.js
command.
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