public int GetSymbol()

in src/ICSharpCode.SharpZipLib/Zip/Compression/InflaterHuffmanTree.cs [181:235]

• 54 lines of code
• 8 McCabe index (conditional complexity)

		public int GetSymbol(StreamManipulator input)
		{
			int lookahead, symbol;
			if ((lookahead = input.PeekBits(9)) >= 0)
			{
                symbol = tree[lookahead];
				int bitlen = symbol & 15;

				if (symbol >= 0)
				{
                    if(bitlen == 0){
                        throw new SharpZipBaseException("Encountered invalid codelength 0");
                    } 
					input.DropBits(bitlen);
					return symbol >> 4;
				}
				int subtree = -(symbol >> 4);
				if ((lookahead = input.PeekBits(bitlen)) >= 0)
				{
					symbol = tree[subtree | (lookahead >> 9)];
					input.DropBits(symbol & 15);
					return symbol >> 4;
				}
				else
				{
					int bits = input.AvailableBits;
					lookahead = input.PeekBits(bits);
					symbol = tree[subtree | (lookahead >> 9)];
					if ((symbol & 15) <= bits)
					{
						input.DropBits(symbol & 15);
						return symbol >> 4;
					}
					else
					{
						return -1;
					}
				}
			}
			else // Less than 9 bits
			{
				int bits = input.AvailableBits;
				lookahead = input.PeekBits(bits);
				symbol = tree[lookahead];
				if (symbol >= 0 && (symbol & 15) <= bits)
				{
					input.DropBits(symbol & 15);
					return symbol >> 4;
				}
				else
				{
					return -1;
				}
			}
		}