/// <inheritdoc />
public Structure Load(string filename)
{
using (var fs = File.OpenRead(filename))
using (var bs = new BrotliStream(fs, CompressionMode.Decompress))
using (var s = new BinaryReader(bs))
{
var idMap = new TranslationMap();
var diffMap = new DiffMap();
var identBytes = new byte[ScarifStructure.Magic.Length];
var read = s.Read(identBytes, 0, identBytes.Length);
var ident = Encoding.UTF8.GetString(identBytes);
if (ident != ScarifStructure.Magic || read != identBytes.Length)
{
throw new IOException("Input file not SCARIF structure");
}
var version = s.ReadInt32();
if (version != 1)
{
throw new IOException("Input file not SCARIF v1");
}
var numChunks = s.ReadInt32();
var numIdMapEntries = s.ReadInt32();
for (var entryIdx = 0; entryIdx < numIdMapEntries; entryIdx++)
{
var id = s.ReadInt16();
var name = ReadNullTerminatedString(s);
idMap.Add(id, name);
}
var lowestPos = new BlockPos(int.MaxValue, int.MaxValue, int.MaxValue);
var highestPos = new BlockPos(int.MinValue, int.MinValue, int.MinValue);
for (var chunkIdx = 0; chunkIdx < numChunks; chunkIdx++)
{
var chunkX = s.ReadInt32();
var chunkZ = s.ReadInt32();
var numBlocks = s.ReadInt32();
var blocks = new Dictionary <BlockPos, Block>();
for (var blockIdx = 0; blockIdx < numBlocks; blockIdx++)
{
// Format:
// 0b 0000 1111
// xxxx zzzz
var xz = s.ReadByte();
var x = (byte)((xz & 0xF0) >> 4);
var z = (byte)(xz & 0x0F);
var y = s.ReadByte();
EnforceBounds(chunkX * 16 + x, y, chunkZ * 16 + z, ref lowestPos, ref highestPos);
var id = s.ReadInt16();
var flags = (BlockFlags)s.ReadByte();
byte metadata = 0;
NbtTree tileTag = null;
if (flags.Has(BlockFlags.Metadata))
{
metadata = s.ReadByte();
}
if (flags.Has(BlockFlags.Nbt))
{
var len = s.ReadInt32();
if (len <= 0)
{
throw new IOException("Zero-length NBT present");
}
var bytes = s.ReadBytes(len);
using (var ms = new MemoryStream(bytes))
{
tileTag = new NbtTree(ms);
}
}
if (idMap.ContainsKey(id))
{
blocks[new BlockPos(x, y, z)] = new Block(idMap.TranslateBlock(id), metadata, tileTag?.Root);
}
else
{
throw new IOException($"Unknown block ID found: {id}");
}
}
diffMap.Add(new ChunkPosition(chunkX, chunkZ), blocks);
}
return(new ScarifStructure(idMap, diffMap, lowestPos, highestPos));
}
}
private static string TranslateBlockId(TranslationMap map, int id)
{
return(map.ContainsKey((short)id) ? map[(short)id] : $"unknown:{id}");
}
