Add support for protocol version 1.21.100 (#12)

README.md

@@ -4,7 +4,8 @@ A gophertunnel protocol interface implementation to support older Minecraft Bedr
 
 ## Supported Versions
 | Protocol ID | Version  | Support |
-|-------------|---------|---------|
+|-------------|----------|---------|
+| 827         | 1.21.100 | ✅       |
 | 819         | 1.21.93  | ✅       |
 | 818         | 1.21.90  | ✅       |
 | 800         | 1.21.80  | ✅       |

cmd/dfmapping/main.go

@@ -4,11 +4,12 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
-	"github.com/samber/lo"
-	"github.com/sandertv/gophertunnel/minecraft/nbt"
 	"io"
 	"net/http"
 	"os"
+
+	"github.com/samber/lo"
+	"github.com/sandertv/gophertunnel/minecraft/nbt"
 )
 
 func main() {

example-proxy.go

@@ -2,15 +2,16 @@ package main
 
 import (
 	"errors"
+	"log"
+	"os"
+	"sync"
+	"time"
+
 	"github.com/akmalfairuz/legacy-version/legacyver"
 	"github.com/pelletier/go-toml"
 	"github.com/sandertv/gophertunnel/minecraft"
 	"github.com/sandertv/gophertunnel/minecraft/auth"
 	"golang.org/x/oauth2"
-	"log"
-	"os"
-	"sync"
-	"time"
 )
 
 // The following program implements a proxy that forwards players from one local address to a remote address.

go.mod

@@ -5,16 +5,16 @@ go 1.24
 toolchain go1.24.0
 
 require (
-	github.com/df-mc/dragonfly v0.10.3
+	github.com/df-mc/dragonfly v0.10.5
 	github.com/df-mc/worldupgrader v1.0.19
 	github.com/go-gl/mathgl v1.2.0
 	github.com/google/uuid v1.6.0
 	github.com/pelletier/go-toml v1.9.5
 	github.com/rogpeppe/go-internal v1.14.1
 	github.com/samber/lo v1.49.1
-	github.com/sandertv/gophertunnel v1.47.4
+	github.com/sandertv/gophertunnel v1.49.0
 	github.com/segmentio/fasthash v1.0.3
-	golang.org/x/exp v0.0.0-20250305212735-054e65f0b394
+	golang.org/x/exp v0.0.0-20250718183923-645b1fa84792
 	golang.org/x/image v0.25.0
 	golang.org/x/oauth2 v0.30.0
 )
@@ -22,13 +22,13 @@ require (
 require (
 	github.com/brentp/intintmap v0.0.0-20190211203843-30dc0ade9af9 // indirect
 	github.com/df-mc/goleveldb v1.1.9 // indirect
-	github.com/go-jose/go-jose/v4 v4.1.0 // indirect
+	github.com/go-jose/go-jose/v4 v4.1.2 // indirect
 	github.com/golang/snappy v1.0.0 // indirect
 	github.com/klauspost/compress v1.18.0 // indirect
 	github.com/muhammadmuzzammil1998/jsonc v1.0.0 // indirect
 	github.com/sandertv/go-raknet v1.14.3-0.20250305181847-6af3e95113d6 // indirect
-	golang.org/x/crypto v0.39.0 // indirect
+	golang.org/x/crypto v0.41.0 // indirect
-	golang.org/x/mod v0.25.0 // indirect
+	golang.org/x/mod v0.26.0 // indirect
-	golang.org/x/net v0.41.0 // indirect
+	golang.org/x/net v0.43.0 // indirect
-	golang.org/x/text v0.26.0 // indirect
+	golang.org/x/text v0.28.0 // indirect
 )

go.sum

@@ -1,11 +1,19 @@
 github.com/brentp/intintmap v0.0.0-20190211203843-30dc0ade9af9 h1:/G0ghZwrhou0Wq21qc1vXXMm/t/aKWkALWwITptKbE0=
 github.com/brentp/intintmap v0.0.0-20190211203843-30dc0ade9af9/go.mod h1:TOk10ahXejq9wkEaym3KPRNeuR/h5Jx+s8QRWIa2oTM=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cooldogedev/gophertunnel v0.0.0-20250805131657-cc74f1797ff7 h1:IvKtI+ka2fAVh+QFEuLjLTQPyYARaem3q9pr+Y7wJCI=
+github.com/cooldogedev/gophertunnel v0.0.0-20250805131657-cc74f1797ff7/go.mod h1:lmRarAmn25V/+QeiUbUDXeA26bEaNlX1wGEM/rj39ew=
+github.com/cooldogedev/gophertunnel v0.0.0-20250806215416-758d5047d822 h1:cW4FrZUxjdJBoSD3Fpw7Z86LQJHtTK7o9lIgGXuaZ3Q=
+github.com/cooldogedev/gophertunnel v0.0.0-20250806215416-758d5047d822/go.mod h1:lmRarAmn25V/+QeiUbUDXeA26bEaNlX1wGEM/rj39ew=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/df-mc/dragonfly v0.9.20-0.20241229163702-cc7e4ee0e3ce h1:mhBn/ezojzACPHeg+Y9NnU2bbYCozx27RgpfWUPw4i0=
 github.com/df-mc/dragonfly v0.9.20-0.20241229163702-cc7e4ee0e3ce/go.mod h1:hH1eU9lmucLNLehzxXzOUOmHJQLz3DLpQMUqIKcz8YI=
 github.com/df-mc/dragonfly v0.10.3 h1:t0mxRvjjgG8uBevqqzejJVL2M6obi6RYePMTPDlXo74=
 github.com/df-mc/dragonfly v0.10.3/go.mod h1:pO7nuyRKV50ZVZzB7AhTMU/0p4cvk1/yCu43vFqAzcI=
+github.com/df-mc/dragonfly v0.10.5 h1:vn3Mwh7vWPDtIdss4QEOP8vSZGHRAjyLvrOEM5mEUI0=
+github.com/df-mc/dragonfly v0.10.5/go.mod h1:/KjoqvIe5+ZxuFUPSRey9UzQS3GkTgAyTH0jTYFMs/g=
 github.com/df-mc/goleveldb v1.1.9 h1:ihdosZyy5jkQKrxucTQmN90jq/2lUwQnJZjIYIC/9YU=
 github.com/df-mc/goleveldb v1.1.9/go.mod h1:+NHCup03Sci5q84APIA21z3iPZCuk6m6ABtg4nANCSk=
 github.com/df-mc/worldupgrader v1.0.18 h1:Q34X9ID/hGuDyj9oiq+dpyjOaJdNxhVmVUepf/EPYDA=
@@ -19,6 +27,8 @@ github.com/go-jose/go-jose/v4 v4.0.5 h1:M6T8+mKZl/+fNNuFHvGIzDz7BTLQPIounk/b9dw3
 github.com/go-jose/go-jose/v4 v4.0.5/go.mod h1:s3P1lRrkT8igV8D9OjyL4WRyHvjB6a4JSllnOrmmBOA=
 github.com/go-jose/go-jose/v4 v4.1.0 h1:cYSYxd3pw5zd2FSXk2vGdn9igQU2PS8MuxrCOCl0FdY=
 github.com/go-jose/go-jose/v4 v4.1.0/go.mod h1:GG/vqmYm3Von2nYiB2vGTXzdoNKE5tix5tuc6iAd+sw=
+github.com/go-jose/go-jose/v4 v4.1.2 h1:TK/7NqRQZfgAh+Td8AlsrvtPoUyiHh0LqVvokh+1vHI=
+github.com/go-jose/go-jose/v4 v4.1.2/go.mod h1:22cg9HWM1pOlnRiY+9cQYJ9XHmya1bYW8OeDM6Ku6Oo=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/golang/snappy v1.0.0 h1:Oy607GVXHs7RtbggtPBnr2RmDArIsAefDwvrdWvRhGs=
@@ -62,6 +72,10 @@ github.com/sandertv/gophertunnel v1.47.3 h1:MsHv8QEx17+N/39BnAvHn/KU9zv8Rt9ZHTKa
 github.com/sandertv/gophertunnel v1.47.3/go.mod h1:lvzOdyb2fkoo3uySe++hy4UKq0I649oUFJKkro2ZHpY=
 github.com/sandertv/gophertunnel v1.47.4 h1:PmNbEUf9+7Fk8bP2875cvYTt22g0d4eeQhtd1dxjqqA=
 github.com/sandertv/gophertunnel v1.47.4/go.mod h1:lvzOdyb2fkoo3uySe++hy4UKq0I649oUFJKkro2ZHpY=
+github.com/sandertv/gophertunnel v1.48.1 h1:+DleZznxkYugxEIEFAKN4JDfYSv/zm6//MfYFdIgyq8=
+github.com/sandertv/gophertunnel v1.48.1/go.mod h1:lmRarAmn25V/+QeiUbUDXeA26bEaNlX1wGEM/rj39ew=
+github.com/sandertv/gophertunnel v1.49.0 h1:9FIl4GGYMrFTmBPgkOTUskGWRQHIg4NMpY8JdM6SrCg=
+github.com/sandertv/gophertunnel v1.49.0/go.mod h1:lmRarAmn25V/+QeiUbUDXeA26bEaNlX1wGEM/rj39ew=
 github.com/segmentio/fasthash v1.0.3 h1:EI9+KE1EwvMLBWwjpRDc+fEM+prwxDYbslddQGtrmhM=
 github.com/segmentio/fasthash v1.0.3/go.mod h1:waKX8l2N8yckOgmSsXJi7x1ZfdKZ4x7KRMzBtS3oedY=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
@@ -72,10 +86,16 @@ golang.org/x/crypto v0.38.0 h1:jt+WWG8IZlBnVbomuhg2Mdq0+BBQaHbtqHEFEigjUV8=
 golang.org/x/crypto v0.38.0/go.mod h1:MvrbAqul58NNYPKnOra203SB9vpuZW0e+RRZV+Ggqjw=
 golang.org/x/crypto v0.39.0 h1:SHs+kF4LP+f+p14esP5jAoDpHU8Gu/v9lFRK6IT5imM=
 golang.org/x/crypto v0.39.0/go.mod h1:L+Xg3Wf6HoL4Bn4238Z6ft6KfEpN0tJGo53AAPC632U=
+golang.org/x/crypto v0.40.0 h1:r4x+VvoG5Fm+eJcxMaY8CQM7Lb0l1lsmjGBQ6s8BfKM=
+golang.org/x/crypto v0.40.0/go.mod h1:Qr1vMER5WyS2dfPHAlsOj01wgLbsyWtFn/aY+5+ZdxY=
+golang.org/x/crypto v0.41.0 h1:WKYxWedPGCTVVl5+WHSSrOBT0O8lx32+zxmHxijgXp4=
+golang.org/x/crypto v0.41.0/go.mod h1:pO5AFd7FA68rFak7rOAGVuygIISepHftHnr8dr6+sUc=
 golang.org/x/exp v0.0.0-20241217172543-b2144cdd0a67 h1:1UoZQm6f0P/ZO0w1Ri+f+ifG/gXhegadRdwBIXEFWDo=
 golang.org/x/exp v0.0.0-20241217172543-b2144cdd0a67/go.mod h1:qj5a5QZpwLU2NLQudwIN5koi3beDhSAlJwa67PuM98c=
 golang.org/x/exp v0.0.0-20250305212735-054e65f0b394 h1:nDVHiLt8aIbd/VzvPWN6kSOPE7+F/fNFDSXLVYkE/Iw=
 golang.org/x/exp v0.0.0-20250305212735-054e65f0b394/go.mod h1:sIifuuw/Yco/y6yb6+bDNfyeQ/MdPUy/hKEMYQV17cM=
+golang.org/x/exp v0.0.0-20250718183923-645b1fa84792 h1:R9PFI6EUdfVKgwKjZef7QIwGcBKu86OEFpJ9nUEP2l4=
+golang.org/x/exp v0.0.0-20250718183923-645b1fa84792/go.mod h1:A+z0yzpGtvnG90cToK5n2tu8UJVP2XUATh+r+sfOOOc=
 golang.org/x/image v0.21.0 h1:c5qV36ajHpdj4Qi0GnE0jUc/yuo33OLFaa0d+crTD5s=
 golang.org/x/image v0.21.0/go.mod h1:vUbsLavqK/W303ZroQQVKQ+Af3Yl6Uz1Ppu5J/cLz78=
 golang.org/x/image v0.25.0 h1:Y6uW6rH1y5y/LK1J8BPWZtr6yZ7hrsy6hFrXjgsc2fQ=
@@ -86,6 +106,8 @@ golang.org/x/mod v0.24.0 h1:ZfthKaKaT4NrhGVZHO1/WDTwGES4De8KtWO0SIbNJMU=
 golang.org/x/mod v0.24.0/go.mod h1:IXM97Txy2VM4PJ3gI61r1YEk/gAj6zAHN3AdZt6S9Ww=
 golang.org/x/mod v0.25.0 h1:n7a+ZbQKQA/Ysbyb0/6IbB1H/X41mKgbhfv7AfG/44w=
 golang.org/x/mod v0.25.0/go.mod h1:IXM97Txy2VM4PJ3gI61r1YEk/gAj6zAHN3AdZt6S9Ww=
+golang.org/x/mod v0.26.0 h1:EGMPT//Ezu+ylkCijjPc+f4Aih7sZvaAr+O3EHBxvZg=
+golang.org/x/mod v0.26.0/go.mod h1:/j6NAhSk8iQ723BGAUyoAcn7SlD7s15Dp9Nd/SfeaFQ=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.38.0 h1:vRMAPTMaeGqVhG5QyLJHqNDwecKTomGeqbnfZyKlBI8=
 golang.org/x/net v0.38.0/go.mod h1:ivrbrMbzFq5J41QOQh0siUuly180yBYtLp+CKbEaFx8=
@@ -93,6 +115,10 @@ golang.org/x/net v0.40.0 h1:79Xs7wF06Gbdcg4kdCCIQArK11Z1hr5POQ6+fIYHNuY=
 golang.org/x/net v0.40.0/go.mod h1:y0hY0exeL2Pku80/zKK7tpntoX23cqL3Oa6njdgRtds=
 golang.org/x/net v0.41.0 h1:vBTly1HeNPEn3wtREYfy4GZ/NECgw2Cnl+nK6Nz3uvw=
 golang.org/x/net v0.41.0/go.mod h1:B/K4NNqkfmg07DQYrbwvSluqCJOOXwUjeb/5lOisjbA=
+golang.org/x/net v0.42.0 h1:jzkYrhi3YQWD6MLBJcsklgQsoAcw89EcZbJw8Z614hs=
+golang.org/x/net v0.42.0/go.mod h1:FF1RA5d3u7nAYA4z2TkclSCKh68eSXtiFwcWQpPXdt8=
+golang.org/x/net v0.43.0 h1:lat02VYK2j4aLzMzecihNvTlJNQUq316m2Mr9rnM6YE=
+golang.org/x/net v0.43.0/go.mod h1:vhO1fvI4dGsIjh73sWfUVjj3N7CA9WkKJNQm2svM6Jg=
 golang.org/x/oauth2 v0.28.0 h1:CrgCKl8PPAVtLnU3c+EDw6x11699EWlsDeWNWKdIOkc=
 golang.org/x/oauth2 v0.28.0/go.mod h1:onh5ek6nERTohokkhCD/y2cV4Do3fxFHFuAejCkRWT8=
 golang.org/x/oauth2 v0.30.0 h1:dnDm7JmhM45NNpd8FDDeLhK6FwqbOf4MLCM9zb1BOHI=
@@ -109,6 +135,10 @@ golang.org/x/text v0.25.0 h1:qVyWApTSYLk/drJRO5mDlNYskwQznZmkpV2c8q9zls4=
 golang.org/x/text v0.25.0/go.mod h1:WEdwpYrmk1qmdHvhkSTNPm3app7v4rsT8F2UD6+VHIA=
 golang.org/x/text v0.26.0 h1:P42AVeLghgTYr4+xUnTRKDMqpar+PtX7KWuNQL21L8M=
 golang.org/x/text v0.26.0/go.mod h1:QK15LZJUUQVJxhz7wXgxSy/CJaTFjd0G+YLonydOVQA=
+golang.org/x/text v0.27.0 h1:4fGWRpyh641NLlecmyl4LOe6yDdfaYNrGb2zdfo4JV4=
+golang.org/x/text v0.27.0/go.mod h1:1D28KMCvyooCX9hBiosv5Tz/+YLxj0j7XhWjpSUF7CU=
+golang.org/x/text v0.28.0 h1:rhazDwis8INMIwQ4tpjLDzUhx6RlXqZNPEM0huQojng=
+golang.org/x/text v0.28.0/go.mod h1:U8nCwOR8jO/marOQ0QbDiOngZVEBB7MAiitBuMjXiNU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=

internal/block_states.go

@@ -2,10 +2,11 @@ package internal
 
 import (
 	"fmt"
-	"github.com/df-mc/worldupgrader/blockupgrader"
 	"sort"
 	"strings"
 	"unsafe"
+
+	"github.com/df-mc/worldupgrader/blockupgrader"
 )
 
 // StateHash is a struct that may be used as a map key for block states. It contains the name of the block state

internal/chunk/chunk.go

@@ -1,8 +1,9 @@
 package chunk
 
 import (
-	"github.com/df-mc/dragonfly/server/block/cube"
 	"sync"
+
+	"github.com/df-mc/dragonfly/server/block/cube"
 )
 
 // Chunk is a segment in the world with a size of 16x16x256 blocks. A chunk contains multiple sub chunks

internal/chunk/decode.go

@@ -3,6 +3,7 @@ package chunk
 import (
 	"bytes"
 	"fmt"
+
 	"github.com/df-mc/dragonfly/server/block/cube"
 )
 

internal/chunk/encode.go

@@ -2,8 +2,9 @@ package chunk
 
 import (
 	"bytes"
-	"github.com/df-mc/dragonfly/server/block/cube"
 	"sync"
+
+	"github.com/df-mc/dragonfly/server/block/cube"
 )
 
 // pool is used to pool byte buffers used for encoding chunks.

internal/chunk/encoding.go

@@ -4,9 +4,10 @@ import (
 	"bytes"
 	"encoding/binary"
 	"fmt"
-	"github.com/akmalfairuz/legacy-version/mapping"
 	"strings"
 
+	"github.com/akmalfairuz/legacy-version/mapping"
+
 	"github.com/df-mc/dragonfly/server/block/cube"
 	"github.com/df-mc/worldupgrader/blockupgrader"
 	"github.com/sandertv/gophertunnel/minecraft/nbt"

internal/item/registry.go

@@ -4,12 +4,13 @@ import (
 	"bytes"
 	"embed"
 	"encoding/json"
-	"github.com/df-mc/worldupgrader/blockupgrader"
-	"github.com/sandertv/gophertunnel/minecraft/nbt"
-	"github.com/sandertv/gophertunnel/minecraft/protocol"
 	"regexp"
 	"sort"
 	"strconv"
+
+	"github.com/df-mc/worldupgrader/blockupgrader"
+	"github.com/sandertv/gophertunnel/minecraft/nbt"
+	"github.com/sandertv/gophertunnel/minecraft/protocol"
 )
 
 var (

internal/pool.go

@@ -0,0 +1,13 @@
+package internal
+
+import (
+	"bytes"
+	"sync"
+)
+
+// BufferPool is a sync.Pool for buffers used to write compressed data to.
+var BufferPool = sync.Pool{
+	New: func() any {
+		return bytes.NewBuffer(make([]byte, 0, 256))
+	},
+}

legacyver/all.go

@@ -8,6 +8,7 @@ import (
 // must be set to true if you're using Dragonfly.
 func All(dragonflyMapping bool) []minecraft.Protocol {
 	return []minecraft.Protocol{
+		New819(dragonflyMapping),
 		New818(dragonflyMapping),
 		New800(dragonflyMapping),
 		New786(dragonflyMapping),

legacyver/block_translator.go

@@ -3,6 +3,8 @@ package legacyver
 import (
 	"bytes"
 	_ "embed"
+
+	"github.com/akmalfairuz/legacy-version/internal"
 	"github.com/akmalfairuz/legacy-version/internal/chunk"
 	"github.com/akmalfairuz/legacy-version/mapping"
 	"github.com/df-mc/dragonfly/server/block/cube"
@@ -43,29 +45,28 @@ func NewBlockTranslator(mapping mapping.Block, latestMapping mapping.Block, pse
 	return &DefaultBlockTranslator{mapping: mapping, latest: latestMapping, pse: pse, pe: pe, oldFormat: oldFormat}
 }
 
-func (t *DefaultBlockTranslator) DowngradeBlockPackets(pks []packet.Packet, conn *minecraft.Conn) (result []packet.Packet) {
+func (t *DefaultBlockTranslator) downgradeLevelChunkPacket(pk *packet.LevelChunk) error {
-	for _, pk := range pks {
-		switch pk := pk.(type) {
-		case *packet.LevelChunk:
 	count := int(pk.SubChunkCount)
 	if count == protocol.SubChunkRequestModeLimitless || count == protocol.SubChunkRequestModeLimited {
-				break
+		return nil
 	}
 
 	buf := bytes.NewBuffer(pk.RawPayload)
-			writeBuf := bytes.NewBuffer(nil)
+	writeBuf := internal.BufferPool.Get().(*bytes.Buffer)
+	defer func() {
+		writeBuf.Reset()
+		internal.BufferPool.Put(writeBuf)
+	}()
 	if !pk.CacheEnabled {
 		c, err := chunk.NetworkDecode(t.latest.Air(), buf, count, false, world.Overworld.Range(), LatestNetworkPersistentEncoding, LatestBlockPaletteEncoding)
 		if err != nil {
-					//fmt.Println(err)
+			return err
-					break
 		}
 		c = t.DowngradeChunk(c)
 
 		payload, err := chunk.NetworkEncode(t.mapping.Air(), c, t.oldFormat, t.pe)
 		if err != nil {
-					//fmt.Println(err)
+			return err
-					break
 		}
 		writeBuf.Write(payload)
 		pk.SubChunkCount = uint32(len(c.Sub()))
@@ -75,12 +76,12 @@ func (t *DefaultBlockTranslator) DowngradeBlockPackets(pks []packet.Packet, conn
 	countBorder, err := buf.ReadByte()
 	if err != nil {
 		pk.RawPayload = append(writeBuf.Bytes(), safeBytes...)
-				break
+		return nil
 	}
 	borderBytes := make([]byte, countBorder)
 	if _, err = buf.Read(borderBytes); err != nil {
 		pk.RawPayload = append(writeBuf.Bytes(), safeBytes...)
-				break
+		return nil
 	}
 	writeBuf.WriteByte(countBorder)
 	writeBuf.Write(borderBytes)
@@ -99,6 +100,14 @@ func (t *DefaultBlockTranslator) DowngradeBlockPackets(pks []packet.Packet, conn
 		}
 	}
 	pk.RawPayload = append(writeBuf.Bytes(), buf.Bytes()...)
+	return nil
+}
+
+func (t *DefaultBlockTranslator) DowngradeBlockPackets(pks []packet.Packet, conn *minecraft.Conn) (result []packet.Packet) {
+	for _, pk := range pks {
+		switch pk := pk.(type) {
+		case *packet.LevelChunk:
+			_ = t.downgradeLevelChunkPacket(pk)
 		case *packet.SubChunk:
 			r := world.Overworld.Range()
 			if t.oldFormat {
@@ -247,11 +256,11 @@ func (t *DefaultBlockTranslator) DowngradeBlockRuntimeID(input uint32) uint32 {
 	}
 	state, ok := t.latest.RuntimeIDToState(input)
 	if !ok {
-		return t.mapping.Air()
+		return t.mapping.InfoUpdate()
 	}
 	runtimeID, ok := t.mapping.StateToRuntimeID(state)
 	if !ok {
-		return t.mapping.Air()
+		return t.mapping.InfoUpdate()
 	}
 	return runtimeID
 }
@@ -315,11 +324,11 @@ func (t *DefaultBlockTranslator) UpgradeBlockRuntimeID(input uint32) uint32 {
 	}
 	state, ok := t.mapping.RuntimeIDToState(input)
 	if !ok {
-		return t.latest.Air()
+		return t.latest.InfoUpdate()
 	}
 	runtimeID, ok := t.latest.StateToRuntimeID(state)
 	if !ok {
-		return t.latest.Air()
+		return t.latest.InfoUpdate()
 	}
 	return runtimeID
 }

legacyver/item_translator.go

@@ -2,6 +2,7 @@ package legacyver
 
 import (
 	"fmt"
+
 	"github.com/akmalfairuz/legacy-version/internal/item"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"

legacyver/legacypacket/biome_definition_list.go

@@ -2,6 +2,7 @@ package legacypacket
 
 import (
 	"encoding/base64"
+
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/samber/lo"
 	"github.com/sandertv/gophertunnel/minecraft/protocol"
@@ -13,7 +14,7 @@ import (
 // accurately recreate the server-side generation in vanilla worlds/servers for increased performance.
 type BiomeDefinitionList struct {
 	// BiomeDefinitions is a list of biomes that are available on the server.
-	BiomeDefinitions []protocol.BiomeDefinition
+	BiomeDefinitions []proto.BiomeDefinition
 	// StringList is a makeshift dictionary implementation Mojang created to try and reduce the size of the
 	// overall packet. It is a list of common strings that are used in the biome definitions, such as
 	// biome names, float values or query expressions.

legacyver/legacypacket/camera_aim_assist.go

@@ -22,6 +22,8 @@ type CameraAimAssist struct {
 	TargetMode byte
 	// Action is the action that should be performed with the aim assist. This is one of the constants above.
 	Action byte
+	// ShowDebugRender specifies if debug render should be shown.
+	ShowDebugRender bool
 }
 
 // ID ...
@@ -37,4 +39,7 @@ func (pk *CameraAimAssist) Marshal(io protocol.IO) {
 	io.Float32(&pk.Distance)
 	io.Uint8(&pk.TargetMode)
 	io.Uint8(&pk.Action)
+	if proto.IsProtoGTE(io, proto.ID827) {
+		io.Bool(&pk.ShowDebugRender)
+	}
 }

legacyver/legacypacket/camera_instruction.go

@@ -18,6 +18,8 @@ type CameraInstruction struct {
 	Target protocol.Optional[protocol.CameraInstructionTarget]
 	// RemoveTarget can be set to true to remove the current aim assist target.
 	RemoveTarget protocol.Optional[bool]
+	// FieldOfView is a camera instruction that updates the field of view for the camera.
+	FieldOfView protocol.Optional[protocol.CameraInstructionFieldOfView]
 }
 
 // ID ...
@@ -33,4 +35,7 @@ func (pk *CameraInstruction) Marshal(io protocol.IO) {
 		protocol.OptionalMarshaler(io, &pk.Target)
 		protocol.OptionalFunc(io, &pk.RemoveTarget, io.Bool)
 	}
+	if proto.IsProtoGTE(io, proto.ID827) {
+		protocol.OptionalMarshaler(io, &pk.FieldOfView)
+	}
 }

legacyver/legacypacket/correct_player_move_prediction.go

@@ -41,7 +41,7 @@ func (pk *CorrectPlayerMovePrediction) Marshal(io protocol.IO) {
 	}
 	io.Vec3(&pk.Position)
 	io.Vec3(&pk.Delta)
-	if proto.IsProtoGTE(io, proto.ID671) {
+	if proto.IsProtoGTE(io, proto.ID671) && proto.IsProtoLT(io, proto.ID827) {
 		if pk.PredictionType == packet.PredictionTypeVehicle {
 			io.Vec2(&pk.Rotation)
 			if proto.IsProtoGTE(io, proto.ID712) {
@@ -49,6 +49,10 @@ func (pk *CorrectPlayerMovePrediction) Marshal(io protocol.IO) {
 			}
 		}
 	}
+	if proto.IsProtoGTE(io, proto.ID827) {
+		io.Vec2(&pk.Rotation)
+		protocol.OptionalFunc(io, &pk.VehicleAngularVelocity, io.Float32)
+	}
 	io.Bool(&pk.OnGround)
 	io.Varuint64(&pk.Tick)
 }

legacyver/legacypacket/start_game.go

@@ -238,6 +238,8 @@ type StartGame struct {
 	// its index in the expected block palette. This is useful for servers that wish to support multiple protocol versions
 	// and custom blocks, but it will result in extra bytes being written for every block in a sub chunk palette.
 	UseBlockNetworkIDHashes bool
+	// TickDeathSystemsEnabled specifies if the new tick death systems are enabled.
+	TickDeathSystemsEnabled bool
 	// ServerAuthoritativeSound is currently unknown as to what it does.
 	ServerAuthoritativeSound bool
 }
@@ -336,5 +338,8 @@ func (pk *StartGame) Marshal(io protocol.IO) {
 	io.UUID(&pk.WorldTemplateID)
 	io.Bool(&pk.ClientSideGeneration)
 	io.Bool(&pk.UseBlockNetworkIDHashes)
+	if proto.IsProtoGTE(io, proto.ID827) {
+		io.Bool(&pk.TickDeathSystemsEnabled)
+	}
 	io.Bool(&pk.ServerAuthoritativeSound)
 }

legacyver/proto/biome.go

@@ -0,0 +1,104 @@
+package proto
+
+import "github.com/sandertv/gophertunnel/minecraft/protocol"
+
+// BiomeDefinition represents a biome definition in the game. This can be a vanilla biome or a completely
+// custom biome.
+type BiomeDefinition struct {
+	// NameIndex represents the index of the biome name in the string list.
+	NameIndex int16
+	// BiomeID is the biome ID. This is optional and can be empty.
+	BiomeID int16
+	// Temperature is the temperature of the biome, used for weather, biome behaviours and sky colour.
+	Temperature float32
+	// Downfall is the amount that precipitation affects colours and block changes.
+	Downfall float32
+	// RedSporeDensity is the density of red spore precipitation visuals.
+	RedSporeDensity float32
+	// BlueSporeDensity is the density of blue spore precipitation visuals.
+	BlueSporeDensity float32
+	// AshDensity is the density of ash precipitation visuals.
+	AshDensity float32
+	// WhiteAshDensity is the density of white ash precipitation visuals.
+	WhiteAshDensity float32
+	// Depth ...
+	Depth float32
+	// Scale ...
+	Scale float32
+	// MapWaterColour is an ARGB value for the water colour on maps in the biome.
+	MapWaterColour int32
+	// Rain is true if the biome has rain, false if it is a dry biome.
+	Rain bool
+	// Tags are a list of indices of tags in the string list. These are used to group biomes together for
+	// biome generation and other purposes.
+	Tags protocol.Optional[[]uint16]
+	// ChunkGeneration is optional information to assist in client-side chunk generation. Almost all servers
+	// can and should leave this empty to greatly reduce the size of this packet. Only BDS and servers which
+	// *exactly* match the vanilla chunk generation can benefit from this.
+	ChunkGeneration protocol.Optional[protocol.BiomeChunkGeneration]
+}
+
+func (x *BiomeDefinition) Marshal(r protocol.IO) {
+	r.Int16(&x.NameIndex)
+	if IsProtoLT(r, ID827) {
+		var opt protocol.Optional[int16]
+		if x.BiomeID != -1 {
+			opt = protocol.Option(x.BiomeID)
+		}
+		protocol.OptionalFunc(r, &opt, r.Int16)
+		x.BiomeID, _ = opt.Value()
+	} else {
+		r.Int16(&x.BiomeID)
+	}
+	r.Float32(&x.Temperature)
+	r.Float32(&x.Downfall)
+	r.Float32(&x.RedSporeDensity)
+	r.Float32(&x.BlueSporeDensity)
+	r.Float32(&x.AshDensity)
+	r.Float32(&x.WhiteAshDensity)
+	r.Float32(&x.Depth)
+	r.Float32(&x.Scale)
+	r.Int32(&x.MapWaterColour)
+	r.Bool(&x.Rain)
+	protocol.OptionalFunc(r, &x.Tags, func(s *[]uint16) {
+		protocol.FuncSlice(r, s, r.Uint16)
+	})
+	protocol.OptionalMarshaler(r, &x.ChunkGeneration)
+}
+
+func (x *BiomeDefinition) FromLatest(bd protocol.BiomeDefinition) BiomeDefinition {
+	x.NameIndex = bd.NameIndex
+	x.BiomeID = bd.BiomeID
+	x.Temperature = bd.Temperature
+	x.Downfall = bd.Downfall
+	x.RedSporeDensity = bd.RedSporeDensity
+	x.BlueSporeDensity = bd.BlueSporeDensity
+	x.AshDensity = bd.AshDensity
+	x.WhiteAshDensity = bd.WhiteAshDensity
+	x.Depth = bd.Depth
+	x.Scale = bd.Scale
+	x.MapWaterColour = bd.MapWaterColour
+	x.Rain = bd.Rain
+	x.Tags = bd.Tags
+	x.ChunkGeneration = bd.ChunkGeneration
+	return *x
+}
+
+func (x *BiomeDefinition) ToLatest() protocol.BiomeDefinition {
+	return protocol.BiomeDefinition{
+		NameIndex:        x.NameIndex,
+		BiomeID:          x.BiomeID,
+		Temperature:      x.Temperature,
+		Downfall:         x.Downfall,
+		RedSporeDensity:  x.RedSporeDensity,
+		BlueSporeDensity: x.BlueSporeDensity,
+		AshDensity:       x.AshDensity,
+		WhiteAshDensity:  x.WhiteAshDensity,
+		Depth:            x.Depth,
+		Scale:            x.Scale,
+		MapWaterColour:   x.MapWaterColour,
+		Rain:             x.Rain,
+		Tags:             x.Tags,
+		ChunkGeneration:  x.ChunkGeneration,
+	}
+}

legacyver/proto/id.go

@@ -3,6 +3,7 @@ package proto
 import "github.com/sandertv/gophertunnel/minecraft/protocol"
 
 const (
+	ID827 = 827 // v1.21.100
 	ID819 = 819 // v1.21.93
 	ID818 = 818 // v1.21.90
 	ID800 = 800 // v1.21.80

legacyver/proto/io.go

@@ -2,6 +2,7 @@ package proto
 
 import (
 	"fmt"
+
 	"github.com/sandertv/gophertunnel/minecraft/protocol"
 )
 

legacyver/proto/player.go

@@ -1,9 +1,10 @@
 package proto
 
 import (
+	"image/color"
+
 	"github.com/google/uuid"
 	"github.com/sandertv/gophertunnel/minecraft/protocol"
-	"image/color"
 )
 
 // PlayerListEntry is an entry found in the PlayerList packet. It represents a single player using the UUID

legacyver/protocol.go

@@ -1,13 +1,14 @@
 package legacyver
 
 import (
+	"strings"
+
 	"github.com/akmalfairuz/legacy-version/legacyver/legacypacket"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/samber/lo"
 	"github.com/sandertv/gophertunnel/minecraft"
 	"github.com/sandertv/gophertunnel/minecraft/protocol"
 	"github.com/sandertv/gophertunnel/minecraft/protocol/packet"
-	"strings"
 )
 
 var (
@@ -299,6 +300,7 @@ func (p *Protocol) downgradePackets(pks []packet.Packet, conn *minecraft.Conn) [
 				Distance:        pk.Distance,
 				TargetMode:      pk.TargetMode,
 				Action:          pk.Action,
+				ShowDebugRender: pk.ShowDebugRender,
 			}
 		case *packet.UpdateAttributes:
 			attributes := make([]proto.Attribute, len(pk.Attributes))
@@ -392,6 +394,7 @@ func (p *Protocol) downgradePackets(pks []packet.Packet, conn *minecraft.Conn) [
 				Fade:         pk.Fade,
 				Target:       pk.Target,
 				RemoveTarget: pk.RemoveTarget,
+				FieldOfView:  pk.FieldOfView,
 			}
 		case *packet.ChangeDimension:
 			pks[pkIndex] = &legacypacket.ChangeDimension{
@@ -594,6 +597,7 @@ func (p *Protocol) downgradePackets(pks []packet.Packet, conn *minecraft.Conn) [
 				ScenarioID:                     pk.ScenarioID,
 				OwnerID:                        pk.OwnerID,
 				UseBlockNetworkIDHashes:        pk.UseBlockNetworkIDHashes,
+				TickDeathSystemsEnabled:        pk.TickDeathSystemsEnabled,
 				ServerAuthoritativeSound:       pk.ServerAuthoritativeSound,
 			}
 		case *packet.CodeBuilderSource:
@@ -721,8 +725,12 @@ func (p *Protocol) downgradePackets(pks []packet.Packet, conn *minecraft.Conn) [
 				Visibility: pk.Visibility,
 			}
 		case *packet.BiomeDefinitionList:
+			biomeDefinitions := make([]proto.BiomeDefinition, len(pk.BiomeDefinitions))
+			for i, bd := range pk.BiomeDefinitions {
+				biomeDefinitions[i] = (&proto.BiomeDefinition{}).FromLatest(bd)
+			}
 			pks[pkIndex] = &legacypacket.BiomeDefinitionList{
-				BiomeDefinitions: pk.BiomeDefinitions,
+				BiomeDefinitions: biomeDefinitions,
 				StringList:       pk.StringList,
 			}
 		case *packet.PlayerList:
@@ -873,6 +881,7 @@ func (p *Protocol) upgradePackets(pks []packet.Packet, conn *minecraft.Conn) []p
 				Distance:        pk.Distance,
 				TargetMode:      pk.TargetMode,
 				Action:          pk.Action,
+				ShowDebugRender: pk.ShowDebugRender,
 			}
 		case *legacypacket.UpdateAttributes:
 			attributes := make([]protocol.Attribute, len(pk.Attributes))
@@ -966,6 +975,7 @@ func (p *Protocol) upgradePackets(pks []packet.Packet, conn *minecraft.Conn) []p
 				Fade:         pk.Fade,
 				Target:       pk.Target,
 				RemoveTarget: pk.RemoveTarget,
+				FieldOfView:  pk.FieldOfView,
 			}
 		case *legacypacket.ChangeDimension:
 			pks[pkIndex] = &packet.ChangeDimension{
@@ -1156,6 +1166,7 @@ func (p *Protocol) upgradePackets(pks []packet.Packet, conn *minecraft.Conn) []p
 				ScenarioID:                     pk.ScenarioID,
 				OwnerID:                        pk.OwnerID,
 				UseBlockNetworkIDHashes:        pk.UseBlockNetworkIDHashes,
+				TickDeathSystemsEnabled:        pk.TickDeathSystemsEnabled,
 				ServerAuthoritativeSound:       pk.ServerAuthoritativeSound,
 			}
 		case *legacypacket.CodeBuilderSource:
@@ -1257,8 +1268,12 @@ func (p *Protocol) upgradePackets(pks []packet.Packet, conn *minecraft.Conn) []p
 				Visibility: pk.Visibility,
 			}
 		case *legacypacket.BiomeDefinitionList:
+			biomeDefinitions := make([]protocol.BiomeDefinition, len(pk.BiomeDefinitions))
+			for i, bd := range pk.BiomeDefinitions {
+				biomeDefinitions[i] = bd.ToLatest()
+			}
 			pks[pkIndex] = &packet.BiomeDefinitionList{
-				BiomeDefinitions: pk.BiomeDefinitions,
+				BiomeDefinitions: biomeDefinitions,
 				StringList:       pk.StringList,
 			}
 		case *legacypacket.PlayerList:

legacyver/v649.go

@@ -2,6 +2,7 @@ package legacyver
 
 import (
 	_ "embed"
+
 	"github.com/akmalfairuz/legacy-version/internal/chunk"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"

legacyver/v662.go

@@ -2,6 +2,7 @@ package legacyver
 
 import (
 	_ "embed"
+
 	"github.com/akmalfairuz/legacy-version/internal/chunk"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"

legacyver/v671.go

@@ -2,6 +2,7 @@ package legacyver
 
 import (
 	_ "embed"
+
 	"github.com/akmalfairuz/legacy-version/internal/chunk"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"

legacyver/v685.go

@@ -2,6 +2,7 @@ package legacyver
 
 import (
 	_ "embed"
+
 	"github.com/akmalfairuz/legacy-version/internal/chunk"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"

legacyver/v686.go

@@ -2,6 +2,7 @@ package legacyver
 
 import (
 	_ "embed"
+
 	"github.com/akmalfairuz/legacy-version/internal/chunk"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"

legacyver/v712.go

@@ -2,6 +2,7 @@ package legacyver
 
 import (
 	_ "embed"
+
 	"github.com/akmalfairuz/legacy-version/internal/chunk"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"

legacyver/v729.go

@@ -2,6 +2,7 @@ package legacyver
 
 import (
 	_ "embed"
+
 	"github.com/akmalfairuz/legacy-version/internal/chunk"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"

legacyver/v748.go

@@ -2,6 +2,7 @@ package legacyver
 
 import (
 	_ "embed"
+
 	"github.com/akmalfairuz/legacy-version/internal/chunk"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"

legacyver/v766.go

@@ -2,6 +2,7 @@ package legacyver
 
 import (
 	_ "embed"
+
 	"github.com/akmalfairuz/legacy-version/internal/chunk"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"

legacyver/v776.go

@@ -2,6 +2,7 @@ package legacyver
 
 import (
 	_ "embed"
+
 	"github.com/akmalfairuz/legacy-version/internal/chunk"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"

legacyver/v786.go

@@ -2,6 +2,7 @@ package legacyver
 
 import (
 	_ "embed"
+
 	"github.com/akmalfairuz/legacy-version/internal/chunk"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"

legacyver/v800.go

@@ -2,6 +2,7 @@ package legacyver
 
 import (
 	_ "embed"
+
 	"github.com/akmalfairuz/legacy-version/internal/chunk"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"

legacyver/v818.go

@@ -2,6 +2,7 @@ package legacyver
 
 import (
 	_ "embed"
+
 	"github.com/akmalfairuz/legacy-version/internal/chunk"
 	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"

legacyver/v819.go

@@ -2,32 +2,33 @@ package legacyver
 
 import (
 	_ "embed"
+
+	"github.com/akmalfairuz/legacy-version/internal/chunk"
+	"github.com/akmalfairuz/legacy-version/legacyver/proto"
 	"github.com/akmalfairuz/legacy-version/mapping"
 )
 
 const (
 	// ItemVersion819 ...
-	ItemVersion819 = 271
+	ItemVersion819 = 261
 	// BlockVersion819 ...
 	BlockVersion819 int32 = (1 << 24) | (21 << 16) | (90 << 8)
 )
 
 var (
-	//go:embed data/dragonfly_items.json
-	dragonflyLatestItemList []byte
 	//go:embed data/required_item_list_819.json
 	requiredItemList819 []byte
 	//go:embed data/block_states_819.nbt
 	blockStateData819 []byte
-
-	itemMappingLatestPocketMine = mapping.NewItemMapping(requiredItemList819, ItemVersion819)
-	itemMappingLatestDragonfly  = mapping.NewItemMapping(dragonflyLatestItemList, ItemVersion819)
-	blockMappingLatest          = mapping.NewBlockMapping(blockStateData819)
 )
 
-func itemMappingLatest(dragonflyMapping bool) mapping.Item {
+func New819(dragonflyMapping bool) *Protocol {
-	if dragonflyMapping {
+	itemMapping := mapping.NewItemMapping(requiredItemList819, ItemVersion819)
-		return itemMappingLatestDragonfly
+	blockMapping := mapping.NewBlockMapping(blockStateData819)
+	return &Protocol{
+		ver:             "1.21.90",
+		id:              proto.ID819,
+		blockTranslator: NewBlockTranslator(blockMapping, blockMappingLatest, chunk.NewNetworkPersistentEncoding(blockMapping, BlockVersion819), chunk.NewBlockPaletteEncoding(blockMapping, BlockVersion819), false),
+		itemTranslator:  NewItemTranslator(itemMapping, itemMappingLatest(dragonflyMapping), blockMapping, blockMappingLatest),
 	}
-	return itemMappingLatestPocketMine
 }

legacyver/v827.go

@@ -0,0 +1,34 @@
+package legacyver
+
+import (
+	_ "embed"
+
+	"github.com/akmalfairuz/legacy-version/mapping"
+)
+
+const (
+	// ItemVersion827 ...
+	ItemVersion827 = 271
+	// BlockVersion827 ...
+	BlockVersion827 int32 = (1 << 24) | (21 << 16) | (100 << 8)
+)
+
+var (
+	//go:embed data/dragonfly_items.json
+	dragonflyLatestItemList []byte
+	//go:embed data/required_item_list_827.json
+	requiredItemList827 []byte
+	//go:embed data/block_states_827.nbt
+	blockStateData827 []byte
+
+	itemMappingLatestPocketMine = mapping.NewItemMapping(requiredItemList827, ItemVersion827)
+	itemMappingLatestDragonfly  = mapping.NewItemMapping(dragonflyLatestItemList, ItemVersion827)
+	blockMappingLatest          = mapping.NewBlockMapping(blockStateData827)
+)
+
+func itemMappingLatest(dragonflyMapping bool) mapping.Item {
+	if dragonflyMapping {
+		return itemMappingLatestDragonfly
+	}
+	return itemMappingLatestPocketMine
+}

mapping/block.go

@@ -2,9 +2,10 @@ package mapping
 
 import (
 	"bytes"
-	"github.com/akmalfairuz/legacy-version/internal"
 	"sort"
 
+	"github.com/akmalfairuz/legacy-version/internal"
+
 	"github.com/df-mc/worldupgrader/blockupgrader"
 	"github.com/sandertv/gophertunnel/minecraft/nbt"
 	"github.com/sandertv/gophertunnel/minecraft/protocol"
@@ -23,6 +24,7 @@ type Block interface {
 	// Adjust adjusts the latest mappings to account for custom states.
 	Adjust([]protocol.BlockEntry)
 	Air() uint32
+	InfoUpdate() uint32
 }
 
 type DefaultBlockMapping struct {
@@ -36,6 +38,9 @@ type DefaultBlockMapping struct {
 
 	// airRID is the runtime ID of the air block in the latest version of the game.
 	airRID uint32
+
+	// infoUpdateRID is the runtime ID of the info_update block in the latest version of the game.
+	infoUpdateBlockRID uint32
 }
 
 func NewBlockMapping(raw []byte) *DefaultBlockMapping {
@@ -45,6 +50,7 @@ func NewBlockMapping(raw []byte) *DefaultBlockMapping {
 	stateRuntimeIDs := make(map[internal.StateHash]uint32)
 	runtimeIDToState := make(map[uint32]blockupgrader.BlockState)
 	var airRID *uint32
+	var infoUpdateBlockRID *uint32
 
 	var s blockupgrader.BlockState
 	for {
@@ -54,8 +60,11 @@ func NewBlockMapping(raw []byte) *DefaultBlockMapping {
 
 		rid := uint32(len(states))
 		states = append(states, s)
-		if s.Name == "minecraft:air" {
+		switch s.Name {
+		case "minecraft:air":
 			airRID = &rid
+		case "minecraft:info_update":
+			infoUpdateBlockRID = &rid
 		}
 
 		stateRuntimeIDs[internal.HashState(blockupgrader.Upgrade(s))] = rid
@@ -64,12 +73,16 @@ func NewBlockMapping(raw []byte) *DefaultBlockMapping {
 	if airRID == nil {
 		panic("couldn't find air")
 	}
+	if infoUpdateBlockRID == nil {
+		panic("couldn't find info_update block")
+	}
 
 	return &DefaultBlockMapping{
 		states:             states,
 		stateRuntimeIDs:    stateRuntimeIDs,
 		runtimeIDToState:   runtimeIDToState,
 		airRID:             *airRID,
+		infoUpdateBlockRID: *infoUpdateBlockRID,
 	}
 }
 
@@ -134,3 +147,7 @@ func (m *DefaultBlockMapping) Adjust(entries []protocol.BlockEntry) {
 func (m *DefaultBlockMapping) Air() uint32 {
 	return m.airRID
 }
+
+func (m *DefaultBlockMapping) InfoUpdate() uint32 {
+	return m.infoUpdateBlockRID
+}

mapping/custom_blocks.go

@@ -63,7 +63,7 @@ func generateCombinationsRecursively[K comparable, V any](all map[K][]V, iterato
 
 		for _, value := range set {
 			current[key] = value
-			generateCombinationsRecursively(all, iterator, current, output)
+			generateCombinationsRecursively[K, V](all, iterator, current, output)
 			delete(current, key)
 		}
 

mapping/item.go

@@ -3,8 +3,9 @@ package mapping
 import (
 	"encoding/base64"
 	"encoding/json"
-	"github.com/sandertv/gophertunnel/minecraft/nbt"
 	"sync"
+
+	"github.com/sandertv/gophertunnel/minecraft/nbt"
 )
 
 type Item interface {

packbuilder/builder.go

@@ -1,9 +1,10 @@
 package packbuilder
 
 import (
+	"strings"
+
 	"github.com/df-mc/dragonfly/server/item/category"
 	"golang.org/x/exp/maps"
-	"strings"
 )
 
 // ComponentBuilder represents a builder that can be used to construct an item components map to be sent to a client.

packbuilder/components.go

@@ -1,9 +1,10 @@
 package packbuilder
 
 import (
+	"strings"
+
 	"github.com/df-mc/dragonfly/server/item"
 	"github.com/df-mc/dragonfly/server/world"
-	"strings"
 )
 
 // Components returns all the components of the given custom item. If the item has no components, a nil map and false

packbuilder/items.go

@@ -3,14 +3,15 @@ package packbuilder
 import (
 	"encoding/json"
 	"fmt"
-	"github.com/df-mc/dragonfly/server/world"
-	"golang.org/x/image/colornames"
 	"image"
 	"image/png"
 	"os"
 	"path/filepath"
 	"strings"
 	_ "unsafe" // Imported for compiler directives.
+
+	"github.com/df-mc/dragonfly/server/world"
+	"golang.org/x/image/colornames"
 )
 
 // buildItems builds all the item-related files for the resource pack. This includes textures, language

packbuilder/manifest.go

@@ -2,12 +2,13 @@ package packbuilder
 
 import (
 	"encoding/json"
-	"github.com/google/uuid"
-	"github.com/sandertv/gophertunnel/minecraft/resource"
 	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
+
+	"github.com/google/uuid"
+	"github.com/sandertv/gophertunnel/minecraft/resource"
 )
 
 // buildManifest creates a JSON manifest file for the client to be able to read the resource pack. It creates

packbuilder/resource_pack.go

@@ -1,10 +1,11 @@
 package packbuilder
 
 import (
+	"os"
+
 	"github.com/df-mc/dragonfly/server/world"
 	"github.com/rogpeppe/go-internal/dirhash"
 	"github.com/sandertv/gophertunnel/minecraft/resource"
-	"os"
 )
 
 // BuildResourcePack builds a resource pack based on custom features that have been registered to the server.