/// <summary>
/// Creates a new instance of this class
/// </summary>
protected HTTPMessage()
{
httpHeaders = new HTTPHeaderCollection();
bPayload = new byte[0];
}
/// <summary>
/// Creates a new instance of this class by reading from the given stream.
/// </summary>
/// <param name="sStream">The stream to read from</param>
/// <param name="iLength">An integer which is set to the length of this HTTP message in bytes</param>
protected HTTPMessage(System.IO.Stream sStream, out int iLength)
{
MemoryStream msHeader = new MemoryStream();
byte[] bMessage = null;
HTTPHeaderCollection htHeaders = new HTTPHeaderCollection();
int iContentLength = 0;
int iHeaderLength = 0;
// Get the header
if (!CompressionHelper.CopyUntilFound(sStream, msHeader, new byte[] { (byte)'\r', (byte)'\n', (byte)'\r', (byte)'\n' }))
{
throw new HTTPParserStreamEndedException("The end of the stream was reached while trying to parse the message.");
}
iHeaderLength = (int)msHeader.Length;
//Parse the header and get the content length
byte[] bHeader = msHeader.ToArray();
bool bIsChunked = false;
string strHeaderFields = Encoding.ASCII.GetString(bHeader);
string[] arstrHeaders = strHeaderFields.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
for (int iC1 = 1; iC1 < arstrHeaders.Length; iC1++)
{
string[] arstrHeader = arstrHeaders[iC1].Split(new string[] { ": " }, StringSplitOptions.RemoveEmptyEntries);
if (arstrHeader.Length == 0)
{
throw new HTTPParserException("Invalid HTTP header supplied: " + arstrHeaders[iC1]);
}
if (arstrHeader[0] == "Content-Length" && arstrHeader.Length >= 2)
{
iContentLength = Int32.Parse(arstrHeader[1]);
}
if (arstrHeader[0] == "Transfer-Encoding" && arstrHeader.Length >= 2)
{
bIsChunked = arstrHeader[1].ToLower() == "chunked";
}
}
if (bIsChunked)
{
//We have chunked content encoding (We have to wait)
if (iContentLength != 0)
{
throw new HTTPParserException("The Transfer-Encoding is set to chunked, but " +
"also the Content-Length header is set to " + iContentLength + ". This should not happen.");
}
MemoryStream msChunkedContent = new MemoryStream();
if (!CompressionHelper.CopyUntilFound(sStream, msChunkedContent, new byte[] { (byte)'\r', (byte)'\n', (byte)'0', (byte)'\r', (byte)'\n', (byte)'\r', (byte)'\n' }))
{
throw new HTTPParserStreamEndedException("The end of the stream was reached while trying to parse the message.");
}
iContentLength = (int)msChunkedContent.Length;
bMessage = new byte[iHeaderLength + iContentLength];
msHeader.Position = 0;
msHeader.Read(bMessage, 0, iHeaderLength);
msChunkedContent.Position = 0;
msChunkedContent.Read(bMessage, iHeaderLength, iContentLength);
}
else
{
//We have normal content encoding
//Copy all data into an array
bMessage = new byte[iHeaderLength + iContentLength];
msHeader.Position = 0;
msHeader.Read(bMessage, 0, iHeaderLength);
if (sStream.Read(bMessage, iHeaderLength, iContentLength) != iContentLength)
{
throw new HTTPParserStreamEndedException("The end of the stream was reached while trying to parse the message.");
}
}
//Initialize
iLength = Initialize(bMessage);
//Cleanup
msHeader.Dispose();
}
/// <summary>
/// Initializes this instance with the given data.
/// </summary>
/// <param name="bData">The data to create this HTTP message from</param>
/// <returns>The length of the data which belongs to this HTTP message</returns>
private int Initialize(byte[] bData)
{
int iLength;
byte[] bHeader = null;
byte[] bContent = null;
httpHeaders = new HTTPHeaderCollection();
bPayload = new byte[0];
for (int iC1 = 0; iC1 < bData.Length - 3; iC1++)
{
if (bData[iC1] == '\r' && bData[iC1 + 1] == '\n' && bData[iC1 + 2] == '\r' && bData[iC1 + 3] == '\n')
{
bHeader = new byte[iC1 + 4];
for (int iC2 = 0; iC2 <= iC1 + 3; iC2++)
{
bHeader[iC2] = bData[iC2];
}
break;
//bContent = new byte[bData.Length - iC1 - 4];
//for (int iC2 = 0; iC2 < bData.Length - iC1 - 4; iC2++)
//{
// bHeader[iC2] = bData[iC2 + iC1 + 4];
//}
}
}
if (bHeader == null)
{
bHeader = bData;
}
string strHeaderFields = Encoding.ASCII.GetString(bHeader);
string[] arstrHeaders = strHeaderFields.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
ParseStatusLine(arstrHeaders[0]);
for (int iC1 = 1; iC1 < arstrHeaders.Length; iC1++)
{
int iFirstIndexOf = arstrHeaders[iC1].IndexOf(": ");
if (iFirstIndexOf == -1)
{
throw new HTTPParserException("Invalid HTTP header supplied: " + arstrHeaders[iC1]);
}
string strHeader = arstrHeaders[iC1].Substring(0, iFirstIndexOf);
string strValue = arstrHeaders[iC1].Substring(iFirstIndexOf + 2);
httpHeaders.Add(new HTTPHeader(strHeader, strValue));
}
if (httpHeaders.Contains("Content-Length"))
{
int iContentLength = Int32.Parse(httpHeaders["Content-Length"][0].Value);
if (iContentLength > bData.Length - bHeader.Length)
{
throw new HTTPParserException("Payload length given in HTTP-header is longer then length of HTTP-conversation.");
}
bContent = new byte[iContentLength];
for (int iC1 = 0; iC1 < iContentLength; iC1++)
{
bContent[iC1] = bData[iC1 + bHeader.Length];
}
}
else
{
if (httpHeaders.Contains("Transfer-Encoding") && httpHeaders["Transfer-Encoding"][0].Value.ToLower() == "chunked")
{
//We've got chunked encoding
for (int iC1 = bHeader.Length; iC1 < bData.Length - 4; iC1++)
{
if (bData[iC1] == '\r' && bData[iC1 + 1] == '\n' && bData[iC1 + 2] == '0' && bData[iC1 + 3] == '\r' && bData[iC1 + 4] == '\n')
{
bContent = new byte[iC1 + 5 - bHeader.Length];
for (int iC2 = bHeader.Length; iC2 <= iC1 + 4; iC2++)
{
bContent[iC2 - bHeader.Length] = bData[iC2];
}
break;
}
}
}
else
{
bContent = new byte[0];
}
}
this.bPayload = bContent;
iLength = bHeader.Length + bContent.Length;
return(iLength);
}
