private void RecvDecodingTables()

in src/ICSharpCode.SharpZipLib/BZip2/BZip2InputStream.cs [472:577]
91 lines of code
18 McCabe index (conditional complexity)

		private void RecvDecodingTables()
		{
			char[][] len = new char[BZip2Constants.GroupCount][];
			for (int i = 0; i < BZip2Constants.GroupCount; ++i)
			{
				len[i] = new char[BZip2Constants.MaximumAlphaSize];
			}

			bool[] inUse16 = new bool[16];

			//--- Receive the mapping table ---
			for (int i = 0; i < 16; i++)
			{
				inUse16[i] = (BsR(1) == 1);
			}

			for (int i = 0; i < 16; i++)
			{
				if (inUse16[i])
				{
					for (int j = 0; j < 16; j++)
					{
						inUse[i * 16 + j] = (BsR(1) == 1);
					}
				}
				else
				{
					for (int j = 0; j < 16; j++)
					{
						inUse[i * 16 + j] = false;
					}
				}
			}

			MakeMaps();
			int alphaSize = nInUse + 2;

			//--- Now the selectors ---
			int nGroups = BsR(3);
			int nSelectors = BsR(15);

			for (int i = 0; i < nSelectors; i++)
			{
				int j = 0;
				while (BsR(1) == 1)
				{
					j++;
				}
				selectorMtf[i] = (byte)j;
			}

			//--- Undo the MTF values for the selectors. ---
			byte[] pos = new byte[BZip2Constants.GroupCount];
			for (int v = 0; v < nGroups; v++)
			{
				pos[v] = (byte)v;
			}

			for (int i = 0; i < nSelectors; i++)
			{
				int v = selectorMtf[i];
				byte tmp = pos[v];
				while (v > 0)
				{
					pos[v] = pos[v - 1];
					v--;
				}
				pos[0] = tmp;
				selector[i] = tmp;
			}

			//--- Now the coding tables ---
			for (int t = 0; t < nGroups; t++)
			{
				int curr = BsR(5);
				for (int i = 0; i < alphaSize; i++)
				{
					while (BsR(1) == 1)
					{
						if (BsR(1) == 0)
						{
							curr++;
						}
						else
						{
							curr--;
						}
					}
					len[t][i] = (char)curr;
				}
			}

			//--- Create the Huffman decoding tables ---
			for (int t = 0; t < nGroups; t++)
			{
				int minLen = 32;
				int maxLen = 0;
				for (int i = 0; i < alphaSize; i++)
				{
					maxLen = Math.Max(maxLen, len[t][i]);
					minLen = Math.Min(minLen, len[t][i]);
				}
				HbCreateDecodeTables(limit[t], baseArray[t], perm[t], len[t], minLen, maxLen, alphaSize);
				minLens[t] = minLen;
			}
		}