unsafe byte[] ReadLandChunk(uint chunkX, uint chunkY)
{
// bounds check: keep chunk index within bounds of map
chunkX %= ChunkWidth;
chunkY %= ChunkHeight;
// if this chunk is cached in the buffer, return the cached chunk.
uint key = (chunkX << 16) + chunkY;
uint index = chunkX % 16 + ((chunkY % 16) * 16);
if (m_BufferedLandChunkKeys[index] == key)
{
return(m_BufferedLandChunks[index]);
}
// if it was not cached in the buffer, we will be loading it.
m_BufferedLandChunkKeys[index] = key;
// load the map chunk from a file. Check the patch file first (mapdif#.mul), then the base file (map#.mul).
if (m_Patch.TryGetLandPatch(MapIndex, chunkX, chunkY, ref m_BufferedLandChunks[index]))
{
return(m_BufferedLandChunks[index]);
}
int ptr = (int)((chunkX * ChunkHeight) + chunkY) * SizeOfLandChunk + 4;
if (m_UOPIndex != null)
{
ptr = m_UOPIndex.Lookup(ptr);
}
m_MapDataStream.Seek(ptr, SeekOrigin.Begin);
NativeMethods.ReadBuffer(m_MapDataStream, m_BufferedLandChunks[index], SizeOfLandChunkData);
Metrics.ReportDataRead(SizeOfLandChunkData);
return(m_BufferedLandChunks[index]);
}
private unsafe byte[] readLandChunk(uint chunkX, uint chunkY)
{
// bounds check: keep chunk index within bounds of map
chunkX %= ChunkWidth;
chunkY %= ChunkHeight;
// if this chunk is cached in the buffer, return the cached chunk.
uint key = (chunkX << 16) + chunkY;
uint index = chunkX % 16 + ((chunkY % 16) * 16);
if (m_bufferedLandChunks_Keys[index] == key)
{
return(m_bufferedLandChunks[index]);
}
// if it was not cached in the buffer, we will be loading it.
m_bufferedLandChunks_Keys[index] = key;
// load the map chunk from a file. Check the patch file first (mapdif#.mul), then the base file (map#.mul).
if (m_Patch.TryGetLandPatch(chunkX, chunkY, ref m_bufferedLandChunks[index]))
{
return(m_bufferedLandChunks[index]);
}
else
{
uint ptr = ((chunkX * ChunkHeight) + chunkY) * m_SizeLandChunk + 4;
m_MapDataStream.Seek(ptr, SeekOrigin.Begin);
fixed(byte *pData = m_bufferedLandChunks[index])
{
NativeMethods.Read(m_MapDataStream.SafeFileHandle, pData, m_SizeLandChunkData);
}
Metrics.ReportDataRead(m_SizeLandChunkData);
return(m_bufferedLandChunks[index]);
}
}
