55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
package internal
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import (
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"fmt"
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"sort"
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"strings"
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"unsafe"
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"github.com/df-mc/worldupgrader/blockupgrader"
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)
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// StateHash is a struct that may be used as a map key for block states. It contains the name of the block state
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// and an encoded version of the properties.
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type StateHash struct {
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Name, Properties string
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}
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// HashState produces a hash for the block properties held by the blockState.
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func HashState(state blockupgrader.BlockState) StateHash {
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if state.Properties == nil {
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return StateHash{Name: state.Name}
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}
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keys := make([]string, 0, len(state.Properties))
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for k := range state.Properties {
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keys = append(keys, k)
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}
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sort.Slice(keys, func(i, j int) bool {
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return keys[i] < keys[j]
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})
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var b strings.Builder
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for _, k := range keys {
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switch v := state.Properties[k].(type) {
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case bool:
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if v {
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b.WriteByte(1)
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} else {
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b.WriteByte(0)
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}
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case uint8:
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b.WriteByte(v)
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case int32:
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a := *(*[4]byte)(unsafe.Pointer(&v))
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b.Write(a[:])
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case string:
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b.WriteString(v)
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default:
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// If block encoding is broken, we want to find out as soon as possible. This saves a lot of time
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// debugging in-game.
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panic(fmt.Sprintf("invalid block property type %T for property %v", v, k))
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}
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}
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return StateHash{Name: state.Name, Properties: b.String()}
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}
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