Add fuzz testing for Section encoding/decoding with multiple edge cases

level/chunk.go

@@ -1,54 +1,33 @@
 package level
 
-import (
-	"encoding/binary"
-	"io"
-	"math"
+import "io"
 
-	"github.com/admin-else/strom/data"
-	"github.com/admin-else/strom/util"
-)
-
-type BlockState struct {
-	Id         string
-	Properties map[string]string
+type Chunk struct {
+	Sections []Section
+	version  string
 }
 
-const (
-	ChunkWidth            = 16
-	ChunkColumns          = ChunkWidth * ChunkWidth
-	BlocksPerChunkSection = ChunkWidth * ChunkWidth * ChunkWidth
-	ChunkBiomesWidth      = 4
-	BiomesPerChunkSection = ChunkBiomesWidth * ChunkBiomesWidth * ChunkBiomesWidth
-)
+func ReadChunkFromChunkPacketData(r io.Reader, version string, worldHeight int) (err error) {
+	c := &Chunk{}
+	c.version = version
+	nSections := worldHeight / ChunkWidth
 
-type Section struct {
-	Blocks *Storage[*BlockState]
-	Biomes *Storage[string]
-}
-
-func PossibleBpesBlocks(version string) (ret []uint8) {
-	maxBpe := util.BpeByNum(float64(len(data.BlocksForVersion(version))))
-	ret = []uint8{0, 4, 5, 6, 7, 8, maxBpe}
-	return
-}
-
-func PossibleBpesBiomes(version string) (ret []uint8) {
-	maxBpe := uint8(math.Ceil(math.Log2(float64(len(data.BiomesForVersion(version))))))
-	ret = []uint8{0, 1, 2, 3, maxBpe}
+	c.Sections = make([]Section, nSections)
+	for i := range c.Sections {
+		c.Sections[i], err = SectionDecodePacket(r, version)
+		if err != nil {
+			return
+		}
+	}
 	return
 }
-
-func SectionFromPacket(r io.Reader, version string) (s *Section, err error) {
-	s = &Section{}
-	s.Blocks = NewStorage[*BlockState](BlocksPerChunkSection, PossibleBpesBlocks(version))
-	s.Biomes = NewStorage[string](BiomesPerChunkSection, PossibleBpesBiomes(version))
 
-	var bitsPerEntryBlocks uint8
-	err = binary.Read(r, binary.BigEndian, &bitsPerEntryBlocks)
-	if err != nil {
-		return
+func (c *Chunk) WriteChunkData(w io.Writer) (err error) {
+	for _, s := range c.Sections {
+		err = SectionEncodePacket(w, s)
+		if err != nil {
+			return
+		}
 	}
-
 	return
 }