node-binbone

Node.js(io.js) implemention of binbone, A binary encode specification aimed at achieving optimal space utilization.

Installation

npm i binbone -S

Usage

• Use Block. Block can be use as both an encoder and a decoder.

Block = require("binbone");
block = new Block(1024); // args are the same as a QueueBuffer

block.writeArray([1, 2, 3]);
block.writeUInt("123456789012345"); // Big integer(use [jsbn](https://github.com/andyperlitch/jsbn))
block.readArray();
block.readUInt();

• Use encoder/decoder.

Directly:

Encoder = require("binbone").Encoder;
encodeBlock = new Encoder();

encodeBlock.writeInt(123);

Specify a Buffer for data:

binbone = require('binbone');
buf = new binbone.QueueBuffer();
buf.writeUInt16BE(12);
decoder = new binbone.Decoder(buf);
decoder.readUInt({length: 2});

API

Encoder

• constructor (outputBlock)

  constructor

  • param: outputBlock { FlexBuffer }

    An BinboneBlock Object

• writeTo (outputBlock)

  Reset data block

  • param: outputBlock { FlexBuffer }

    An BinboneBlock Object

• writeByte (value = 0)

  Write a byte.

  • param: value { number=0 }

    byte value

  • return: { number }

    length to write (always 1)

• writeBoolean (value) (alias: writeBool)

  Write a boolean value.

  • param: value { boolean }

    boolean value

  • return: { number }

    length to write (always 1)

• writeUInt (num = 0 | string, opts = {}) (alias: writeLength, writeSign)

  Write an unsigned integer, using variable-length coding.

  • param: num { number=0 | string }

    integer, use string for any big integer

  • param: opts { Object={} }

    options

  • option: length { number }

    byte length of integer (1, 2, 4, 8)

  • return: { number }

    length to write

• writeInt (opts = {}) (alias: writeLong)

  Write an signed integer, using zig-zag variable-length coding.

  • param: opts { Object={} }

    options

  • option: length { number }

    byte length of integer (1, 2, 4, 8)

  • return: { number }

    length to write

• writeFloat (value = 0)

  Write a float.

  • param: value { number=0 }

    float point number

  • return: { number }

    length to write (always 4)

• writeDouble (value = 0)

  Write a double.

  • param: value { number=0 }

    float point number

  • return: { number }

    length to write (always 8)

• writeBytes (values, opts = {})

  Write bytes.

  • param: values { Array | Buffer }

    bytes

  • param: opts { Object={} }

    options

  • option: length { number }

    number of bytes

  • return: { number }

    length to write

• writeString (str, opts = {})

  Write a string.

  • param: str { string }

    string

  • param: opts { Object={} }

    options

  • option: length { number }

    byte length of string

  • return: { number }

    length to write

• writeMap (map = {}, opts = {})

  Write a map.

  • param: map { Object | Map = {} }

    key-value map

  • param: opts { Object={} }

    options

  • option: length { number }

    size of map

  • option: keyType { string|Object }

    type of key [required]

  • option: valueType { string|Object }

    type of value [required]

  • return: { number }

    length to write

• writeArray (arr = [], opts = {})

  Write an array of data.

  • param: arr { Array=[] }

    Array

  • param: opts { Object={} }

    options

  • option: length { number }

    length of array

  • option: valueType { string|Object }

    type of array item

  • return: { number }

    length to write

• writeObject (obj = {}, opts = {})

  Write an object.

  • param: obj { Object={} }

    object

  • param: opts { Object={} }

    options

  • option: length { number }

    size of object

  • option: valueType { string|Object }

    type of object value

  • return: { number }

    length to write

Decoder

• constructor (inputBlock)

  constructor

  • param: inputBlock { QueueBuffer }

    An QueueBuffer Object

• readFrom (inputBlock)

  Reset data block

  • param: inputBlock { QueueBuffer }

    An QueueBuffer Object

• readByte ()

  Read a single byte.

  • return: { number }

    byte

• skipByte ()

  Skip a single byte.

• readBoolean () (alias: readBool)

  Read boolean value.

  • return: { Boolean }

    boolean value

• skipBoolean () (alias: skipBool)

  skip a boolean value.

• readUInt (opts = {}) (alias: readLength, readSign)

  Read an unsigned integer.

  • param: opts { Object={} }

    options

  • option: length { number }

    byte length of integer (1, 2, 4, 8)

  • return: { number|string }

    integer, string for big integer

• skipUInt (opts = {}) (alias: skipLength, skipSign)

  Skip an unsigned integer.

  • param: opts { Object={} }

    options (see readUint)

• readInt (opts = {}) (alias: readLong)

  Read an signed integer.

  • param: opts { Object={} }

    options

  • option: length { number }

    byte length of integer (1, 2, 4, 8)

  • return: { number|string }

    integer, string for big integer

• skipInt (opts = {}) (alias: skipLong)

  Skip a signed integer.

  • param: opts { Object={} }

    options(see readInt)

• readFloat ()

  Read a float.

  • return: { Number }

    float number

• skipFloat ()

  Skip a float.

• readDouble ()

  Read a double.

  • return: { number }

    double number

• skipDouble ()

  Skip a double.

• readBytes (opts = {})

  Read bytes.

  • param: opts { Object={} }

    options

  • option: length { number }

    number of bytes

  • return: { Buffer }

    bytes

• skipBytes (opts = {})

  Skip bytes

  • param: opts { Object={} }

    options(see readBytes)

• readString (opts = {})

  Read a string.

  • param: opts { Object={} }

    options

  • option: length { number }

    byte length of string

  • return: { string }

    string

• skipString (opts = {})

  Skip a string.

  • param: opts { Object={} }

    options(see readString)

• readMap (opts = {})

  Read a map.

  • param: opts { Object={} }

    options

  • option: length { number }

    size of map

  • option: keyType { string|Object }

    type of key[required]

  • option: valueType { string|Object }

    type of value[required]

  • return: { Map(es6)|Object(else) }

    map

• skipMap (opts = {})

  Skip a map.

  • param: opts { Object={} }

    options(see readMap)

• readArray (opts = {})

  Read an array.

  • param: opts { Object={} }

    options

  • option: length { number }

    length of array

  • option: valueType { string|Object }

    type of array item

  • return: { Array }

    array

• skipArray (opts = {})

  Skip an array.

  • param: opts { Object={} }

    options(see readArray)

• readObject (opts = {})

  Read an object.

  • param: opts { Object={} }

    options

  • option: length { number }

    size of object

  • option: valueType { string|Object }

    type of object value

  • return: { Object }

    object

• skipObject (opts = {})

  Skip an array.

  • param: opts { Object={} }

    options(see readObject)

Test

npm test

TODO

• Record type

License

MIT@Jingchen Zhao