kl-buffer

KLBuffer

Fast write/read Buffer in javascript way.

Installation

Install with npm:

npm install kl-buffer

class KLBuffer

Static Function

KLBuffer.alloc(size:number, data:Buffer|TypedArray|DataView|number, deepCopy:boolean) => KLBuffer
Allocates a new KLBuffer of size bytes.

• param
  • size The desired length of the new Buffer
  • data (optional) Initialize data. Buffer/TypedArray/DataView/The memory address of the buffer instance
  • deepCopy (optional) Whether to copy data in depth. Defaults to false

KLBuffer.parseDataToBuffer(data:Buffer|TypedArray|DataView|number, size:number) => Buffer|null
Parse data to buffer

• param
  • data Data to be parsed. Buffer/TypedArray/DataView/The memory address of the buffer instance
  • size The length of the returned Buffer.

Instance Property

buffer Buffer instance

ptrVal The memory address of the buffer instance

ptr Memory block first address pointer

size The length of the buffer

Instance Function

.from(data:Buffer|TypedArray|DataView|number, size:number, deepCopy:boolean) => KLBuffer Copies data from a Buffer or TypedArray or DataView.

• param
  • data Copyed data. Buffer/TypedArray/DataView/The memory address of the buffer instance
  • size The length of the returnd Buffer
  • deepCopy (optional) Defaults to false

.set(val:number) A value to pre-fill the buffer with.

• param
  • val (optional) Defaults to 0

Fast write/read Buffer in javascript way

• char array
• uchar array

  let klBuffer = KLBuffer.alloc(2);
  console.log(klBuffer.ucharArray); //[0,0]
  klBuffer.ucharArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
  console.log(klBuffer.ucharArray); //[1,2,3,4,5,6,7,8,9,10]
  console.log(klBuffer.uchar[5]); //6
  klBuffer.uchar[5] = 50;
  console.log(klBuffer.uchar[5]); //50

• short array
• ushort array
• int array
• uint array
• float array
• double array

  let klBuffer = KLBuffer.alloc(16);
  console.log(klBuffer.doubleArray); //[0,0]
  klBuffer.doubleArray = [1.5, 2.5];
  console.log(klBuffer.doubleArray); //[1.5,2.5]
  console.log(klBuffer.double[0]);  //1.5
  klBuffer.double[0] = 3.5;
  console.log(klBuffer.double[0]);  //3.5

pointer

• copy data from pointer

  let klBuffer1 = KLBuffer.alloc(10);
  let klBuffer2 = KLBuffer.alloc(10);
  klBuffer1.ucharArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
  console.log(klBuffer2.ucharArray); //[0,0,0,0,0,0,0,0,0,0]
  klBuffer2.from(klBuffer1.ptr);
  console.log(klBuffer2.ucharArray); //[1,2,3,4,5,6,7,8,9,10]

• initialization buffer width pointer

  let klBuffer1 = KLBuffer.alloc(10);
  klBuffer1.ucharArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
  let klBuffer2 = KLBuffer.alloc(5, klBuffer1.ucharPtr[5]);
  console.log(klBuffer2.ucharArray); //[6,7,8,9,10]

• The difference between deepCopy being true and false

  let klBuffer1 = KLBuffer.alloc(10);
  klBuffer1.ucharArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
  let klBuffer2 = KLBuffer.alloc(5, klBuffer1.ucharPtr[5], true);
  klBuffer2.ucharArray = [1,2,3,4,5];
  console.log(klBuffer1.ucharArray); //[1,2,3,4,5,6,7,8,9,10]

  let klBuffer3 = KLBuffer.alloc(5, klBuffer1.ucharPtr[5], false);
  klBuffer3.ucharArray = [1,2,3,4,5];
  console.log(klBuffer1.ucharArray); //[1,2,3,4,5,1,2,3,4,5]

  console.log(klBuffer1.ptrVal, klBuffer2.ptrVal, klBuffer3.ptrVal);
  // 2540086547104 2540086697424 2540086547109