unsafe static void CompressMap(Level lvl, Stream stream, LevelChunkStream dst)
{
const int bufferSize = 64 * 1024;
byte[] buffer = new byte[bufferSize];
int bIndex = 0;
ClassicProtocol s = dst.session;
byte[] blocks = lvl.blocks;
float progScale = 100.0f / blocks.Length;
// Store on stack instead of performing function call for every block in map
byte *conv = stackalloc byte[Block.SUPPORTED_COUNT];
byte *convExt = conv + 256; // 256 blocks per group/class
#if TEN_BIT_BLOCKS
byte *convExt2 = conv + 256 * 2;
byte *convExt3 = conv + 256 * 3;
#endif
for (int j = 0; j < Block.SUPPORTED_COUNT; j++)
{
conv[j] = (byte)s.ConvertBlock((BlockID)j);
}
// compress the map data in 64 kb chunks
#if TEN_BIT_BLOCKS
if (s.hasExtBlocks)
{
// Initially assume all custom blocks are <= 255
int i;
for (i = 0; i < blocks.Length; i++)
{
byte block = blocks[i];
if (block == Block.custom_block)
{
buffer[bIndex] = lvl.GetExtTile(i);
}
else if (block == Block.custom_block_2)
{
break;
}
else if (block == Block.custom_block_3)
{
break;
}
else
{
buffer[bIndex] = conv[block];
}
bIndex++;
if (bIndex == bufferSize)
{
stream.Write(buffer, 0, bufferSize);
bIndex = 0;
}
}
// Check if map only used custom blocks <= 255
if (bIndex > 0)
{
stream.Write(buffer, 0, bIndex);
}
if (i == blocks.Length)
{
return;
}
bIndex = 0;
// Nope - have to go slower path now
using (LevelChunkStream dst2 = new LevelChunkStream(s))
using (Stream stream2 = dst2.CompressMapHeader(blocks.Length))
{
dst2.chunkValue = 1; // 'extended' blocks
byte[] buffer2 = new byte[bufferSize];
// Need to fill in all the upper 8 bits of blocks before this one with 0
for (int j = 0; j < i; j += bufferSize)
{
int len = Math.Min(bufferSize, i - j);
stream2.Write(buffer2, 0, len);
}
for (; i < blocks.Length; i++)
{
byte block = blocks[i];
if (block == Block.custom_block)
{
buffer[bIndex] = lvl.GetExtTile(i);
buffer2[bIndex] = 0;
}
else if (block == Block.custom_block_2)
{
buffer[bIndex] = lvl.GetExtTile(i);
buffer2[bIndex] = 1;
}
else if (block == Block.custom_block_3)
{
buffer[bIndex] = lvl.GetExtTile(i);
buffer2[bIndex] = 2;
}
else
{
buffer[bIndex] = conv[block];
buffer2[bIndex] = 0;
}
bIndex++;
if (bIndex == bufferSize)
{
stream.Write(buffer, 0, bufferSize);
stream2.Write(buffer2, 0, bufferSize);
bIndex = 0;
}
}
if (bIndex > 0)
{
stream2.Write(buffer2, 0, bIndex);
}
}
}
else
{
for (int i = 0; i < blocks.Length; i++)
{
byte block = blocks[i];
if (block == Block.custom_block)
{
buffer[bIndex] = convExt[lvl.GetExtTile(i)];
}
else if (block == Block.custom_block_2)
{
buffer[bIndex] = convExt2[lvl.GetExtTile(i)];
}
else if (block == Block.custom_block_3)
{
buffer[bIndex] = convExt3[lvl.GetExtTile(i)];
}
else
{
buffer[bIndex] = conv[block];
}
bIndex++;
if (bIndex == bufferSize)
{
dst.chunkValue = (byte)(i * progScale);
stream.Write(buffer, 0, bufferSize); bIndex = 0;
}
}
}
#else
if (s.hasBlockDefs)
{
for (int i = 0; i < blocks.Length; i++)
{
byte block = blocks[i];
if (block == Block.custom_block)
{
buffer[bIndex] = lvl.GetExtTile(i);
}
else
{
buffer[bIndex] = conv[block];
}
bIndex++;
if (bIndex == bufferSize)
{
dst.chunkValue = (byte)(i * progScale);
stream.Write(buffer, 0, bufferSize); bIndex = 0;
}
}
}
else
{
for (int i = 0; i < blocks.Length; i++)
{
byte block = blocks[i];
if (block == Block.custom_block)
{
buffer[bIndex] = convExt[lvl.GetExtTile(i)];
}
else
{
buffer[bIndex] = conv[block];
}
bIndex++;
if (bIndex == bufferSize)
{
dst.chunkValue = (byte)(i * progScale);
stream.Write(buffer, 0, bufferSize); bIndex = 0;
}
}
}
#endif
if (bIndex > 0)
{
stream.Write(buffer, 0, bIndex);
}
}