Variant Vector Serialization/Deserialization (Go)

This Go implementation provides a mechanism for serializing and deserializing a variant vector (variantvector.Type). The variant vector can hold elements of different types, including uint64, string, and []uint8.

Serialization (Packing)

varsizedIntPack Function

Encodes a uint64 value using a variable-sized integer encoding and appends the encoded bytes to a slice.

Pack Function

Packs a variantvector.Type into a slice of bytes.

• The size of the variant vector is packed first using varsizedIntPack.
• For each variant in the slice:
  • The variant index is packed.
  • Depending on the variant index, the corresponding value is packed (either uint64, string, or []uint8).

Deserialization (Unpacking)

varsizedIntUnpack Function

Decodes a variable-sized integer from a byte slice and updates the offset. Returns the decoded value and the updated offset.

Unpack Function

Unpacks a byte slice into a variantvector.Type.

• Reads the size of the variant vector using varsizedIntUnpack.
• Iterates over the elements in the slice:
  • Reads the variant index using varsizedIntUnpack.
  • Based on the variant index, reads and adds the corresponding value to the variant vector.

Usage

package main

import (
	"fmt"
	"github.com/NIR3X/variantvector"
)

func main() {
	// Creating a variant vector
	v := variantvector.Type{
		uint64(1),
		"Hello",
		[]uint8{0x01, 0x02, 0x03},
	}

	// Packing the variant vector
	packed, err := variantvector.Pack(v)
	if err != nil {
		fmt.Println("Error packing:", err)
		return
	}

	// Displaying the packed bytes
	fmt.Print("Packed Bytes: ")
	for _, b := range packed {
		fmt.Printf("%02x ", b)
	}
	fmt.Println()

	// Unpacking the bytes
	unpacked, err := variantvector.Unpack(packed)
	if err != nil {
		fmt.Println("Error unpacking:", err)
		return
	}

	// Displaying the unpacked values
	fmt.Println("Unpacked Values:")
	for _, variant := range unpacked {
		switch v := variant.(type) {
		case uint64:
			fmt.Println("uint64:", v)
		case string:
			fmt.Println("string:", v)
		case []uint8:
			fmt.Print("[]uint8: ")
			for _, b := range v {
				fmt.Printf("%02x ", b)
			}
			fmt.Println()
		}
	}
}

Dependencies

• This code requires the varsizedint package for encoding and decoding variable-sized integers.

Notes

• The variantvector.Type is used to represent a variant vector.
• Error handling is done using the error type.
• Ensure that dependencies are correctly imported for the code to work as intended.

License

This program is Free Software: You can use, study share and improve it at your will. Specifically you can redistribute and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.