package main

import (
	"fmt"

	"github.com/gogf/gf/v2/encoding/gbinary"
)

func main() {
	// Meta元数据文件数据结构：[键名哈希64(64bit,8byte) 键名长度(8bit,1byte) 键值长度(24bit,3byte) 数据文件偏移量(40bit,5byte)](变长)
	hash := 521369841259754125
	klen := 12
	vlen := 35535
	offset := 80000000

	// 编码
	bits := make([]gbinary.Bit, 0)
	bits = gbinary.EncodeBits(bits, hash, 64)
	bits = gbinary.EncodeBits(bits, klen, 8)
	bits = gbinary.EncodeBits(bits, vlen, 24)
	bits = gbinary.EncodeBits(bits, offset, 40)
	buffer := gbinary.EncodeBitsToBytes(bits)
	fmt.Println("meta length:", len(buffer))

	/* 文件存储及数据查询过程忽略，这里只展示元数据编码/解码示例 */

	// 解码
	metabits := gbinary.DecodeBytesToBits(buffer)
	fmt.Println("hash  :", gbinary.DecodeBits(metabits[0:64]))
	fmt.Println("klen  :", gbinary.DecodeBits(metabits[64:72]))
	fmt.Println("vlen  :", gbinary.DecodeBits(metabits[72:96]))
	fmt.Println("offset:", gbinary.DecodeBits(metabits[96:136]))
}