parse_mapdata.go

package mapparser

import (
	"encoding/binary"
	"fmt"

	"github.com/minetest-go/types"
)

const MapDataSize = 16384

func parseMapdata(rawdata []byte, mapblock *types.MapBlock) error {
	if len(rawdata) < MapDataSize {
		return fmt.Errorf("mapdata length invalid: %d", len(rawdata))
	}

	mapblock.ContentId = make([]int, 4096)
	mapblock.Param1 = make([]int, 4096)
	mapblock.Param2 = make([]int, 4096)

	for i := 0; i < 4096; i++ {
		mapblock.ContentId[i] = int(binary.BigEndian.Uint16(rawdata[i*2:]))
		mapblock.Param1[i] = int(rawdata[(4096*2)+i])
		mapblock.Param2[i] = int(rawdata[(4096*3)+i])
	}

	return nil
}