buffer-iterator

Buffer Itaretor

Let Buffer can be foreach.

Install

$ npm install buffer-iterator

Methods

1. next(needMovePointer = true): Number|Null: Read a byte from buffer, and move pointer to next byte when needMovePointer is true(default), if has not next byte, return null.

   const assert = require('assert');
   const BufferIterator = require('buffer-iterator');
    
   const bi = new BufferIterator(Buffer.from([0x01, 0x02]));
   assert.equal(bi.next(), 0x01);

2. prev(needMovePointer = false): Number|Null: Read a previous byte from buffer, and move pointer to previous byte when needMovePointer is true(default false), if has not previous byte, return null.

   const assert = require('assert');
   const BufferIterator = require('buffer-iterator');
    
   const bi = new BufferIterator(Buffer.from([0x01, 0x02]));
   bi.next();
   bi.next();
   assert.equal(bi.prev(), 0x01);

3. current(): Number: Read current byte, if has not current byte, return null..

   const assert = require('assert');
   const BufferIterator = require('buffer-iterator');
    
   const bi = new BufferIterator(Buffer.from([0x01, 0x02]));
   bi.next();
   assert.equal(bi.current(), 0x01);

4. hasNext(): Boolean: If have remain bytes to read.

   const assert = require('assert');
   const BufferIterator = require('buffer-iterator');
    
   const bi = new BufferIterator(Buffer.from([0x01, 0x02]));
   bi.next();
   assert.equal(bi.hasNext(), true);

5. remainLength(): Number: Count bytes which have not been read.

   const assert = require('assert');
   const BufferIterator = require('buffer-iterator');
    
   const bi = new BufferIterator(Buffer.from([0x01, 0x02]));
   bi.next();
   assert.equal(bi.remainLength(), 1);

6. readBytes(number = 1): Buffer|Null: Read multi bytes.

   const assert = require('assert');
   const BufferIterator = require('buffer-iterator');
    
   const bi = new BufferIterator(Buffer.from([0x01, 0x02]));
   assert.equal(bi.readBytes(10).equals(Buffer.from([0x01, 0x02])), true);

7. append(buf): Null: Append buffer.

   const assert = require('assert');
   const BufferIterator = require('buffer-iterator');
    
   const bi = new BufferIterator(Buffer.from([0x01, 0x02]));
   bi.append(Buffer.from([0x03]));
   assert.equal(bi.buffer.equals(Buffer.from([0x01, 0x02, 0x03])), true);

8. use for...of.

   const assert = require('assert');
   const BufferIterator = require('buffer-iterator');
    
   const bi = new BufferIterator(Buffer.from([0x01, 0x02]));
   for (let byte of bi) {
     console.log(byte);
   }
    
   // 1
   // 2