Method readHeader

HttpClient.cpp:487–562

}

int HttpClient::readHeader()
{
    char c = read();

    if (endOfHeadersReached())
    {
        // We've passed the headers, but rather than return an error, we'll just
        // act as a slightly less efficient version of read()
        return c;
    }

    // Whilst reading out the headers to whoever wants them, we'll keep an
    // eye out for the "Content-Length" header
    switch(iState)
    {
    case eStatusCodeRead:
        // We're at the start of a line, or somewhere in the middle of reading
        // the Content-Length prefix
        if (*iContentLengthPtr == c)
        {
            // This character matches, just move along
            iContentLengthPtr++;
            if (*iContentLengthPtr == '\0')
            {
                // We've reached the end of the prefix
                iState = eReadingContentLength;
                // Just in case we get multiple Content-Length headers, this
                // will ensure we just get the value of the last one
                iContentLength = 0;
            }
        }
        else if ((iContentLengthPtr == kContentLengthPrefix) && (c == '\r'))
        {
            // We've found a '\r' at the start of a line, so this is probably
            // the end of the headers
            iState = eLineStartingCRFound;
        }
        else
        {
            // This isn't the Content-Length header, skip to the end of the line
            iState = eSkipToEndOfHeader;
        }
        break;
    case eReadingContentLength:
        if (isdigit(c))
        {
            iContentLength = iContentLength*10 + (c - '0');
        }
        else
        {
            // We've reached the end of the content length
            // We could sanity check it here or double-check for "\r\n"
            // rather than anything else, but let's be lenient
            iState = eSkipToEndOfHeader;
        }
        break;
    case eLineStartingCRFound:
        if (c == '\n')