ts-buff
v0.0.9
Published
A simple type-safe schema-based buffer serialization library in TypeScript
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Ts-Buff - A buffer serialization library
Ts-Buff is a simple and small serialization library that allows you to serialize and deserialize objects in a buffer format with a schema-based api. Serialized chunks can only have fixed sizes, so you will need to define maximum sizes for dynamic data types like strings or decimal types.
Installation
npm install ts-buff
Usage
Define a schema with the fields you need. Then create a buffer context with the appropriate size. (The required size can be acquired using schema.size
). Once you create a buffer context you can call schema.write
to write the object to the buffer, and schema.read
to read it back.
Note that the buffer context will move with each read/write operation, so you will need to reset it with
tsbuff.rewindContext
if you want to read the buffer again.
import tsbuff from 'ts-buff';
//Define a schema
const schema = tsbuff.object({
someNumber: tsbuff.uint32(),
someBool: tsbuff.boolean()
});
//Create a buffer context and write to it
const context = tsbuff.bufferContext(schema.size);
schema.write(context, {
someNumber: 1,
someBool: true
});
console.log(context.buffer); // -> <Buffer 01 00 00 00 01>
//Reset the context offset and read it
tsbuff.rewindContext(context);
console.log(schema.read(context)); // -> { someNumber: 1, someBool: true }
Currently the serialization completely fails up on mismatched types or malformed input, so make sure to use the correct types when reading and writing.
Due to how the serialization is implemented dynamically sized types like strings or arrays must be defined with a predefined size. This means that you will need to define a maximum size for these types.
import tsbuff from 'ts-buff';
tsbuff.string(10); // A string with a maximum size of 10
tsbuff.array(tsbuff.uint32(), 10); // An array with a maximum size of 10
Numeric types
tsbuff.int8()
: 8-bit signed integertsbuff.int16()
: 16-bit signed integertsbuff.int32()
: 32-bit signed integertsbuff.uint8()
: 8-bit unsigned integertsbuff.uint16()
: 16-bit unsigned integertsbuff.uint32()
: 32-bit unsigned integertsbuff.float32()
: 32-bit floating point numbertsbuff.float64()
: 64-bit floating point number
Other types
tsbuff.boolean()
: a booleantsbuff.date()
: a date objecttsbuff.string(size)
: a string with a fixed sizetsbuff.array(schema, size)
: an array with a fixed sizetsbuff.object(schema)
: an object with a fixed size
Utility functions
//Creates a buffer context with the given size.
tsbuff.bufferContext(size: number): BufferContext
//Resets the buffer context offset to 0.
tsbuff.rewindContext(context: BufferContext): void
Creating Custom Types
You can also create your own custom serializable types. Every type must have a size
property that returns the size of the type in bytes, a write
and read
method that handle the serialization and deserialization of the type.
import { createSerializable } from 'ts-buff/core';
function int512(): Serializable<number> {
return createSerializable({
size: 512,
write: (context, value) => context.buffer.writeIntLE(value, context.offset, 512),
read: (context) => context.buffer.readIntLE(context.offset, 512)
});
}