private string GetNextKey()

in src/Microsoft.Azure.Relay/WebSockets/NetStandard20/AuthenticationHelper.Digest.cs [341:394]
36 lines of code
15 McCabe index (conditional complexity)

            private string GetNextKey(string data, int currentIndex, out int parsedIndex)
            {
                // Skip leading space or tab.
                while (currentIndex < data.Length && CharIsSpaceOrTab(data[currentIndex]))
                {
                    currentIndex++;
                }

                // Start parsing key
                int start = currentIndex;

                // Parse till '=' is encountered marking end of key.
                // Key cannot contain space or tab, break if either is found.
                while (currentIndex < data.Length && data[currentIndex] != '=' && !CharIsSpaceOrTab(data[currentIndex]))
                {
                    currentIndex++;
                }

                if (currentIndex == data.Length)
                {
                    // Key didn't terminate with '='
                    parsedIndex = currentIndex;
                    return null;
                }

                // Record end of key.
                int length = currentIndex - start;
                if (CharIsSpaceOrTab(data[currentIndex]))
                {
                    // Key parsing terminated due to ' ' or '\t'.
                    // Parse till '=' is found.
                    while (currentIndex < data.Length && CharIsSpaceOrTab(data[currentIndex]))
                    {
                        currentIndex++;
                    }

                    if (currentIndex == data.Length || data[currentIndex] != '=')
                    {
                        // Key is invalid.
                        parsedIndex = currentIndex;
                        return null;
                    }
                }

                // Skip trailing space and tab and '='
                while (currentIndex < data.Length && (CharIsSpaceOrTab(data[currentIndex]) || data[currentIndex] == '='))
                {
                    currentIndex++;
                }

                // Set the parsedIndex to current valid char.
                parsedIndex = currentIndex;
                return data.Substring(start, length);
            }