http message parser

recv.cpp

		while ( gets( line, line_len, BODY_LEN/*sizeof(line)*/ ) != NULL )
		{

			if ( strncmp( line, "Host:", 5 ) == 0 )
			{
				strncpy_s(m_strHost, 100, line + 5, sizeof(m_strHost)-1);
			}
			else if ( strncmp( line, "Connection:", 11 ) == 0 )
			{
				if(strstr(line, "Keep-Alive")) 
					m_bKeepAlive = true;
			}
			else if ( strncmp( line, "Authorization:", 14 ) == 0 )
			{

				sscanf_s( line, "Authorization: %[^ ] %[^ ]", m_strAuthProtocol, sizeof(m_strAuthProtocol), m_strAuthorization, sizeof(m_strAuthorization));
			}
			else if ( strncmp(line, "Content-Type: multipart/form-data", 33) == 0 )
			{
				sscanf_s( line, "%*s %*s boundary=%*[-]%s", boundary, sizeof(boundary));
				is_upload_file = true;
			}
			else if ( strncmp(line, "Content-Disposition: ", 21) == 0)
			{
				sscanf_s( line, "%*s %*s %*s filename=\"%[^\"]\"", file_name, sizeof(file_name));
				const char* pslash = strrchr(file_name, '\\');
				if (pslash != NULL){
					pslash += 1;
					memmove(file_name, pslash, strlen(pslash)+1);
				}
				continue;
			}
			else if (is_upload_file && !strncmp(line, "---", 3) && strstr(line, boundary)) // To find the boundary
			{
				is_boundary = !is_boundary;
				continue;
			}
			
			// copy file content from the http body
			if (is_boundary && line_len >= 1 && strncmp(line, "Content-Type:", 13)){
				assert(line_len < BODY_LEN - body_len);

				memcpy_s(tmpbody, BODY_LEN - body_len, line, line_len);
				tmpbody += line_len;
				body_len += line_len;
			}

			memset(line, '\0', BODY_LEN*sizeof(char));
		}