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Add vanilla parity harness and harden server boundaries

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This commit is contained in:
Daniar Mannanov 2026-08-10 22:52:44 +03:00
parent 1924cb5591
commit ca019756ec
25 changed files with 1118 additions and 217 deletions
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69
internal/world/vanilla_parity_test.go
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@ -1,7 +1,9 @@
package world
import (
"encoding/binary"
"encoding/json"
"io"
"math"
"os"
"strconv"
@ -9,6 +11,73 @@ import (
"testing"
)
const vanillaParityFixture = "testdata/vanilla_overworld_12345.bin"
func TestVanillaBlockParity(t *testing.T) {
f, err := os.Open(vanillaParityFixture)
if err != nil {
if os.Getenv("REGIONIO_REQUIRE_PARITY") == "1" {
t.Fatalf("required parity fixture: %v", err)
}
t.Skip("vanilla block fixture not installed; run cmd/vanillacapture with Java 25")
}
defer f.Close()
var header [24]byte
if _, err := io.ReadFull(f, header[:]); err != nil {
t.Fatal(err)
}
if string(header[:8]) != "RIOPAR01" {
t.Fatalf("bad parity fixture magic %q", header[:8])
}
seed := int64(binary.BigEndian.Uint64(header[8:16]))
count := int(binary.BigEndian.Uint32(header[16:20]))
if seed != 12345 || count <= 0 {
t.Fatalf("fixture seed=%d chunks=%d", seed, count)
}
gen := NewVanillaGenerator(seed)
for chunkIndex := 0; chunkIndex < count; chunkIndex++ {
var coords [8]byte
if _, err := io.ReadFull(f, coords[:]); err != nil {
t.Fatal(err)
}
cx := int32(binary.BigEndian.Uint32(coords[:4]))
cz := int32(binary.BigEndian.Uint32(coords[4:]))
chunk := gen(cx, cz)
var state [2]byte
for y := MinY; y < MinY+WorldHeight; y++ {
for z := 0; z < 16; z++ {
for x := 0; x < 16; x++ {
if _, err := io.ReadFull(f, state[:]); err != nil {
t.Fatal(err)
}
want := binary.BigEndian.Uint16(state[:])
if got := chunk.GetBlock(x, y, z); got != want {
t.Fatalf("chunk (%d,%d) block (%d,%d,%d): got state %d want %d", cx, cz, x, y, z, got, want)
}
}
}
}
for y := MinY; y < MinY+WorldHeight; y += biomeCellSize {
for z := 0; z < 16; z += biomeCellSize {
for x := 0; x < 16; x += biomeCellSize {
if _, err := io.ReadFull(f, state[:]); err != nil {
t.Fatal(err)
}
want := binary.BigEndian.Uint16(state[:])
if got := chunk.GetBiome(x, y, z); got != want {
t.Fatalf("chunk (%d,%d) biome (%d,%d,%d): got %d want %d", cx, cz, x, y, z, got, want)
}
}
}
}
}
var trailing [1]byte
if n, err := f.Read(trailing[:]); n != 0 || err != io.EOF {
t.Fatalf("fixture has trailing data or read error: n=%d err=%v", n, err)
}
}
// TestVanillaParity compares our generated surface heights against heights
// captured from the official server (seed 12345, normal terrain). Requires
// /tmp/vanilla_ground.json from the capture step.