Convert between JS object and Node.js buffer with rigidly predetermined scheme.
npm install data-structrequire("data-struct") exports just 3 namespaces:
DataTypes– dictonary of supported types:- boolean – 1 byte
- int8 – 1 byte
- uint8 – 1 byte
- int16 – 2 bytes
- uint16 – 2 bytes
- int32 – 4 bytes
- uint32 – 4 bytes
- float – 4 bytes
- double – 8 bytes
- string – 2 bytes header + string bytes length (max length: 65535 bytes, not string length!)
- shortBuffer – 2 bytes header + buffer length (max length: 65535 bytes)
- buffer – 4 bytes header + buffer length (max length 4294967295 bytes)
DataReader(buffer, scheme)– buffer -> object function.DataWriter(object, scheme)– object -> buffer function.
var DataTypes = require("data-struct").DataTypes;
var DataReader = require("data-struct").DataReader;
var DataWriter = require("data-struct").DataWriter;
var hero = {
id: 9,
name: 'CirnoBaka',
hp: 146,
skills: [
{
id: 34,
description: 'freezing frogs'
},
{
id: 16,
description: 'perfect math'
}
],
playable: false,
experience: 99999999,
position: {
x: 2,
y: 3
}
};
var heroScheme = {
id: DataTypes.uint32,
name: DataTypes.string,
hp: DataTypes.int16,
skills: [{
id: DataTypes.uint16,
description: DataTypes.string
}],
playable: DataTypes.boolean,
experience: DataTypes.uint32,
position: {
x: DataTypes.uint16,
y: DataTypes.uint16
}
};
var heroBuf = DataWriter(hero, heroScheme);
var heroClone = DataReader(heroBuf, heroScheme);
//nested arrays
var map = [
[0,1,0,0,1,1,1,1],
[1,1,0,0,0,1,1,1],
[1,1,0,0,0,0,1,1],
[1,1,1,1,0,0,1,1],
[0,1,1,0,0,0,1,1],
[0,0,0,0,0,1,1,1],
[0,0,0,0,1,1,1,1]
];
var mapScheme = [[DataTypes.uint8]];
var mapBuf = DataWriter(map, mapScheme);
var mapClone = DataReader(mapBuf, mapScheme);MIT