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add bounds checking for ChunkAt and add TimeAt function to ChunkHeader

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This commit is contained in:
adman
2026-05-03 16:28:37 +02:00
parent b01e482bc5
commit da0c3c6f14
1 changed files with 13 additions and 0 deletions
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level/anvil/mca.go
+13
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@@ -63,6 +63,10 @@ func ReadChunkHeader(r *os.File) (ch *ChunkHeader, err error) {
}
func (c *ChunkHeader) ChunkAt(f *os.File, x, z int32) (n *nbt.Tag, err error) {
if x < 0 || z < 0 || x >= ChunksWidthRegionFile || z >= ChunksWidthRegionFile {
err = fmt.Errorf("chunk out of bounds")
return
}
off, size := chunkLocation(c.Chunk[chunkXZtoIndex(x, z)])
_, err = f.Seek(int64(off), 0)
if err != nil {
@@ -94,6 +98,15 @@ func (c *ChunkHeader) ChunkAt(f *os.File, x, z int32) (n *nbt.Tag, err error) {
return
}
func (c *ChunkHeader) TimeAt(f *os.File, x, z int32) (t int32, err error) {
if x < 0 || z < 0 || x >= ChunksWidthRegionFile || z >= ChunksWidthRegionFile {
err = fmt.Errorf("chunk out of bounds")
return
}
t = c.Time[chunkXZtoIndex(x, z)]
return
}
func chunkXZtoIndex(x, z int32) int32 {
return (x % ChunksWidthRegionFile) + (z%ChunksWidthRegionFile)*ChunksWidthRegionFile
}