public unsafe static void CompressMap(Player p, LevelChunkStream dst)
{
const int bufferSize = 64 * 1024;
byte[] buffer = new byte[bufferSize];
int bIndex = 0;
// Store on stack instead of performing function call for every block in map
byte *conv = stackalloc byte[256];
byte *convCPE = stackalloc byte[256];
for (int i = 0; i < 256; i++)
{
conv[i] = Block.Convert((byte)i);
}
if (!p.hasCustomBlocks)
{
for (int i = 0; i < 256; i++)
{
convCPE[i] = Block.ConvertCPE((byte)i);
conv[i] = Block.ConvertCPE(conv[i]);
}
}
Level lvl = p.level;
bool hasBlockDefs = p.hasBlockDefs;
using (GZipStream gs = new GZipStream(dst, CompressionMode.Compress, true)) {
byte[] blocks = lvl.blocks;
NetUtils.WriteI32(blocks.Length, buffer, 0);
gs.Write(buffer, 0, sizeof(int));
dst.length = blocks.Length;
// compress the map data in 64 kb chunks
if (p.hasCustomBlocks)
{
for (int i = 0; i < blocks.Length; ++i)
{
byte block = blocks[i];
if (block == Block.custom_block)
{
buffer[bIndex] = hasBlockDefs ? lvl.GetExtTile(i) : lvl.GetFallbackExtTile(i);
}
else
{
buffer[bIndex] = conv[block];
}
bIndex++;
if (bIndex == bufferSize)
{
dst.position = i;
gs.Write(buffer, 0, bufferSize); bIndex = 0;
}
}
}
else
{
for (int i = 0; i < blocks.Length; ++i)
{
byte block = blocks[i];
if (block == Block.custom_block)
{
block = hasBlockDefs ? lvl.GetExtTile(i) : lvl.GetFallbackExtTile(i);
buffer[bIndex] = convCPE[block];
}
else
{
buffer[bIndex] = conv[block];
}
bIndex++;
if (bIndex == bufferSize)
{
dst.position = i;
gs.Write(buffer, 0, bufferSize); bIndex = 0;
}
}
}
if (bIndex > 0)
{
gs.Write(buffer, 0, bIndex);
}
}
}
