Region

A storage for REGION_SIZE^3 offsets on a disk.

Format: Header consists of REGION_SIZE^3 records of 4 bytes. record = position << 8 | (size & 0xFF) where position is the number of first sector and size is the total number of sectors that are used by a chunk. Header is followed by sectors each of size SECTOR_SIZE. 4096

Region files are named like x_y_z.region.

struct Region {

this();

this(string regionFilename);

void close();

bool isChunkOnDisk(ChunkRegionPos chunkPosition);

TimestampType chunkTimestamp(ChunkRegionPos chunkPosition);

ChunkStoreInfo getChunkStoreInfo(ChunkRegionPos chunkPosition);

ubyte[] readChunk(ChunkRegionPos chunkPosition, ubyte[] outBuffer, TimestampType timestamp);

void writeChunk(ChunkRegionPos chunkPosition, ubyte[] blockData, TimestampType timestamp);

}

Constructors

this this(): Undocumented in source.
this this(string regionFilename): Undocumented in source.

Members

Functions

chunkTimestamp TimestampType chunkTimestamp(ChunkRegionPos chunkPosition): Undocumented in source. Be warned that the author may not have intended to support it.
close void close(): Closes the underlyiing file handle. Renders Region unusable after this.
getChunkStoreInfo ChunkStoreInfo getChunkStoreInfo(ChunkRegionPos chunkPosition): Undocumented in source. Be warned that the author may not have intended to support it.
isChunkOnDisk bool isChunkOnDisk(ChunkRegionPos chunkPosition): Returns true if chunk is presented on disk. Positions are region local. I.e. 0..REGION_SIZE
readChunk ubyte[] readChunk(ChunkRegionPos chunkPosition, ubyte[] outBuffer, TimestampType timestamp): Reads chunk from a file. Chunks positions are region local in range 0..REGION_SIZE. outBuffer should be big enough to store chunk of any size.
writeChunk void writeChunk(ChunkRegionPos chunkPosition, ubyte[] blockData, TimestampType timestamp): Writes chunk at chunkPosition with data blockData to disk. Positions are region local. I.e. 0..REGION_SIZE

Region

Constructors

Members

Functions

Meta

Source