support 100 Continue HTTP responses

ChangeLog

@@ -54,6 +54,7 @@
 	* added more detailed instrumentation of the disk I/O thread
 
 
+	* support 100 Continue HTTP responses
 	* changed default choker behavior to use 8 unchoke slots (instead of being rate based)
 	* fixed error reporting issue in disk I/O thread
 	* fixed file allocation issues on linux

src/http_parser.cpp

@@ -91,6 +91,9 @@ namespace libtorrent
 		}
 
 		char const* pos = recv_buffer.begin + m_recv_pos;
+
+restart_response:
+
 		if (m_state == read_status)
 		{
 			TORRENT_ASSERT(!m_finished);
@@ -160,6 +163,13 @@ namespace libtorrent
 				std::string::size_type separator = line.find(':');
 				if (separator == std::string::npos)
 				{
+					if (m_status_code == 100)
+					{
+						// for 100 Continue, we need to read another response header
+						// before reading the body
+						m_state = read_status;
+						goto restart_response;
+					}
 					// this means we got a blank line,
 					// the header is finished and the body
 					// starts.

test/test_primitives.cpp

@@ -939,6 +939,24 @@ int test_main()
 	TEST_CHECK(parser.content_range() == (std::pair<size_type, size_type>(0, 4)));
 	TEST_CHECK(parser.content_length() == 5);
 
+	parser.reset();
+
+	// make sure we support content-range responses
+	// and that we're case insensitive
+	char const* one_hundred_response =
+		"HTTP/1.1 100 Continue\n"
+		"\r\n"
+		"HTTP/1.1 200 OK\n"
+		"Content-Length: 4\r\n"
+		"Content-Type: test/plain\r\n"
+		"\r\n"
+		"test";
+
+	received = feed_bytes(parser, one_hundred_response);
+
+	TEST_CHECK(received == make_tuple(4, int(strlen(one_hundred_response) - 4), false));
+	TEST_EQUAL(parser.content_length(), 4);
+
 	{
 		// test chunked encoding parser
 		char const chunk_header1[] = "f;this is a comment\r\n";