private static ParserState ParseStatusLine(
byte[] buffer,
int bytesReady,
ref int bytesConsumed,
ref HttpStatusLineState statusLineState,
int maximumHeaderLength,
ref int totalBytesConsumed,
StringBuilder currentToken,
HttpUnsortedResponse httpResponse)
{
Contract.Assert((bytesReady - bytesConsumed) >= 0, "ParseRequestLine()|(bytesReady - bytesConsumed) < 0");
Contract.Assert(maximumHeaderLength <= 0 || totalBytesConsumed <= maximumHeaderLength, "ParseRequestLine()|Headers already read exceeds limit.");
// Remember where we started.
int initialBytesParsed = bytesConsumed;
int segmentStart;
// Set up parsing status with what will happen if we exceed the buffer.
ParserState parseStatus = ParserState.DataTooBig;
int effectiveMax = maximumHeaderLength <= 0 ? Int32.MaxValue : (maximumHeaderLength - totalBytesConsumed + bytesConsumed);
if (bytesReady < effectiveMax)
{
parseStatus = ParserState.NeedMoreData;
effectiveMax = bytesReady;
}
Contract.Assert(bytesConsumed < effectiveMax, "We have already consumed more than the max header length.");
switch (statusLineState)
{
case HttpStatusLineState.BeforeVersionNumbers:
segmentStart = bytesConsumed;
while (buffer[bytesConsumed] != '/')
{
if (buffer[bytesConsumed] < 0x21 || buffer[bytesConsumed] > 0x7a)
{
parseStatus = ParserState.Invalid;
goto quit;
}
if (++bytesConsumed == effectiveMax)
{
string token = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(token);
goto quit;
}
}
if (bytesConsumed > segmentStart)
{
string token = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(token);
}
// Validate value
string version = currentToken.ToString();
if (String.CompareOrdinal(FormattingUtilities.HttpVersionToken, version) != 0)
{
throw new FormatException(Error.Format(Resources.HttpInvalidVersion, version, FormattingUtilities.HttpVersionToken));
}
currentToken.Clear();
// Move past the '/'
statusLineState = HttpStatusLineState.MajorVersionNumber;
if (++bytesConsumed == effectiveMax)
{
goto quit;
}
goto case HttpStatusLineState.MajorVersionNumber;
case HttpStatusLineState.MajorVersionNumber:
segmentStart = bytesConsumed;
while (buffer[bytesConsumed] != '.')
{
if (buffer[bytesConsumed] < '0' || buffer[bytesConsumed] > '9')
{
parseStatus = ParserState.Invalid;
goto quit;
}
if (++bytesConsumed == effectiveMax)
{
string major = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(major);
goto quit;
}
}
if (bytesConsumed > segmentStart)
{
string major = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(major);
}
// Move past the "."
currentToken.Append('.');
statusLineState = HttpStatusLineState.MinorVersionNumber;
if (++bytesConsumed == effectiveMax)
{
goto quit;
}
goto case HttpStatusLineState.MinorVersionNumber;
case HttpStatusLineState.MinorVersionNumber:
segmentStart = bytesConsumed;
while (buffer[bytesConsumed] != ' ')
{
if (buffer[bytesConsumed] < '0' || buffer[bytesConsumed] > '9')
{
parseStatus = ParserState.Invalid;
goto quit;
}
if (++bytesConsumed == effectiveMax)
{
string minor = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(minor);
goto quit;
}
}
if (bytesConsumed > segmentStart)
{
string minor = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(minor);
}
// Copy out value
httpResponse.Version = Version.Parse(currentToken.ToString());
currentToken.Clear();
// Move past the SP
statusLineState = HttpStatusLineState.StatusCode;
if (++bytesConsumed == effectiveMax)
{
goto quit;
}
goto case HttpStatusLineState.StatusCode;
case HttpStatusLineState.StatusCode:
segmentStart = bytesConsumed;
while (buffer[bytesConsumed] != ' ')
{
if (buffer[bytesConsumed] < '0' || buffer[bytesConsumed] > '9')
{
parseStatus = ParserState.Invalid;
goto quit;
}
if (++bytesConsumed == effectiveMax)
{
string method = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(method);
goto quit;
}
}
if (bytesConsumed > segmentStart)
{
string method = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(method);
}
// Copy value out
int statusCode = Int32.Parse(currentToken.ToString(), CultureInfo.InvariantCulture);
if (statusCode < 100 || statusCode > 1000)
{
throw new FormatException(Error.Format(Resources.HttpInvalidStatusCode, statusCode, 100, 1000));
}
httpResponse.StatusCode = (HttpStatusCode)statusCode;
currentToken.Clear();
// Move past the SP
statusLineState = HttpStatusLineState.ReasonPhrase;
if (++bytesConsumed == effectiveMax)
{
goto quit;
}
goto case HttpStatusLineState.ReasonPhrase;
case HttpStatusLineState.ReasonPhrase:
segmentStart = bytesConsumed;
while (buffer[bytesConsumed] != '\r')
{
if (buffer[bytesConsumed] < 0x20 || buffer[bytesConsumed] > 0x7a)
{
parseStatus = ParserState.Invalid;
goto quit;
}
if (++bytesConsumed == effectiveMax)
{
string addr = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(addr);
goto quit;
}
}
if (bytesConsumed > segmentStart)
{
string addr = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(addr);
}
// Copy value out
httpResponse.ReasonPhrase = currentToken.ToString();
currentToken.Clear();
// Move past the CR
statusLineState = HttpStatusLineState.AfterCarriageReturn;
if (++bytesConsumed == effectiveMax)
{
goto quit;
}
goto case HttpStatusLineState.AfterCarriageReturn;
case HttpStatusLineState.AfterCarriageReturn:
if (buffer[bytesConsumed] != '\n')
{
parseStatus = ParserState.Invalid;
goto quit;
}
parseStatus = ParserState.Done;
bytesConsumed++;
break;
}
quit:
totalBytesConsumed += bytesConsumed - initialBytesParsed;
return(parseStatus);
}
private static ParserState ParseStatusLine(
byte[] buffer,
int bytesReady,
ref int bytesConsumed,
ref HttpStatusLineState statusLineState,
int maximumHeaderLength,
ref int totalBytesConsumed,
StringBuilder currentToken,
HttpUnsortedResponse httpResponse)
{
Contract.Assert((bytesReady - bytesConsumed) >= 0, "ParseRequestLine()|(bytesReady - bytesConsumed) < 0");
Contract.Assert(maximumHeaderLength <= 0 || totalBytesConsumed <= maximumHeaderLength, "ParseRequestLine()|Headers already read exceeds limit.");
// Remember where we started.
int initialBytesParsed = bytesConsumed;
int segmentStart;
// Set up parsing status with what will happen if we exceed the buffer.
ParserState parseStatus = ParserState.DataTooBig;
int effectiveMax = maximumHeaderLength <= 0 ? Int32.MaxValue : (maximumHeaderLength - totalBytesConsumed + bytesConsumed);
if (bytesReady < effectiveMax)
{
parseStatus = ParserState.NeedMoreData;
effectiveMax = bytesReady;
}
Contract.Assert(bytesConsumed < effectiveMax, "We have already consumed more than the max header length.");
switch (statusLineState)
{
case HttpStatusLineState.BeforeVersionNumbers:
segmentStart = bytesConsumed;
while (buffer[bytesConsumed] != '/')
{
if (buffer[bytesConsumed] < 0x21 || buffer[bytesConsumed] > 0x7a)
{
parseStatus = ParserState.Invalid;
goto quit;
}
if (++bytesConsumed == effectiveMax)
{
string token = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(token);
goto quit;
}
}
if (bytesConsumed > segmentStart)
{
string token = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(token);
}
// Validate value
string version = currentToken.ToString();
if (String.CompareOrdinal(FormattingUtilities.HttpVersionToken, version) != 0)
{
throw new FormatException(RS.Format(Properties.Resources.HttpInvalidVersion, version, FormattingUtilities.HttpVersionToken));
}
currentToken.Clear();
// Move past the '/'
statusLineState = HttpStatusLineState.MajorVersionNumber;
if (++bytesConsumed == effectiveMax)
{
goto quit;
}
goto case HttpStatusLineState.MajorVersionNumber;
case HttpStatusLineState.MajorVersionNumber:
segmentStart = bytesConsumed;
while (buffer[bytesConsumed] != '.')
{
if (buffer[bytesConsumed] < '0' || buffer[bytesConsumed] > '9')
{
parseStatus = ParserState.Invalid;
goto quit;
}
if (++bytesConsumed == effectiveMax)
{
string major = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(major);
goto quit;
}
}
if (bytesConsumed > segmentStart)
{
string major = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(major);
}
// Move past the "."
currentToken.Append('.');
statusLineState = HttpStatusLineState.MinorVersionNumber;
if (++bytesConsumed == effectiveMax)
{
goto quit;
}
goto case HttpStatusLineState.MinorVersionNumber;
case HttpStatusLineState.MinorVersionNumber:
segmentStart = bytesConsumed;
while (buffer[bytesConsumed] != ' ')
{
if (buffer[bytesConsumed] < '0' || buffer[bytesConsumed] > '9')
{
parseStatus = ParserState.Invalid;
goto quit;
}
if (++bytesConsumed == effectiveMax)
{
string minor = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(minor);
goto quit;
}
}
if (bytesConsumed > segmentStart)
{
string minor = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(minor);
}
// Copy out value
httpResponse.Version = Version.Parse(currentToken.ToString());
currentToken.Clear();
// Move past the SP
statusLineState = HttpStatusLineState.StatusCode;
if (++bytesConsumed == effectiveMax)
{
goto quit;
}
goto case HttpStatusLineState.StatusCode;
case HttpStatusLineState.StatusCode:
segmentStart = bytesConsumed;
while (buffer[bytesConsumed] != ' ')
{
if (buffer[bytesConsumed] < '0' || buffer[bytesConsumed] > '9')
{
parseStatus = ParserState.Invalid;
goto quit;
}
if (++bytesConsumed == effectiveMax)
{
string method = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(method);
goto quit;
}
}
if (bytesConsumed > segmentStart)
{
string method = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(method);
}
// Copy value out
int statusCode = Int32.Parse(currentToken.ToString(), CultureInfo.InvariantCulture);
if (statusCode < 100 || statusCode > 1000)
{
throw new FormatException(RS.Format(Properties.Resources.HttpInvalidStatusCode, statusCode, 100, 1000));
}
httpResponse.StatusCode = (HttpStatusCode)statusCode;
currentToken.Clear();
// Move past the SP
statusLineState = HttpStatusLineState.ReasonPhrase;
if (++bytesConsumed == effectiveMax)
{
goto quit;
}
goto case HttpStatusLineState.ReasonPhrase;
case HttpStatusLineState.ReasonPhrase:
segmentStart = bytesConsumed;
while (buffer[bytesConsumed] != '\r')
{
if (buffer[bytesConsumed] < 0x20 || buffer[bytesConsumed] > 0x7a)
{
parseStatus = ParserState.Invalid;
goto quit;
}
if (++bytesConsumed == effectiveMax)
{
string addr = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(addr);
goto quit;
}
}
if (bytesConsumed > segmentStart)
{
string addr = Encoding.UTF8.GetString(buffer, segmentStart, bytesConsumed - segmentStart);
currentToken.Append(addr);
}
// Copy value out
httpResponse.ReasonPhrase = currentToken.ToString();
currentToken.Clear();
// Move past the CR
statusLineState = HttpStatusLineState.AfterCarriageReturn;
if (++bytesConsumed == effectiveMax)
{
goto quit;
}
goto case HttpStatusLineState.AfterCarriageReturn;
case HttpStatusLineState.AfterCarriageReturn:
if (buffer[bytesConsumed] != '\n')
{
parseStatus = ParserState.Invalid;
goto quit;
}
parseStatus = ParserState.Done;
bytesConsumed++;
break;
}
quit:
totalBytesConsumed += bytesConsumed - initialBytesParsed;
return parseStatus;
}
