http NTLM: split http_ntlm.[ch] between http_ntlm.[ch] and curl_ntlm.[ch]

For modularity purposes, huge chunks of NTLM existing code is transformed into
functions to allow future internal code reuse.

Resulting three new libcurl private functions:

 - Curl_ntlm_create_type1_message()
 - Curl_ntlm_create_type3_message()
 - Curl_ntlm_decode_type2_message()

Changing static ntlm_sspi_cleanup() into non-static Curl_ntlm_sspi_cleanup()

This 'refactoring' has been prepared by previous commits to allow that this
specific one does not introduce any change to existing code. All existing
goodness and badness previous to this commit should remain the same once it is
applied, the only difference should be that existing code is moved into
functions.

Given the quite big portions of code being moved around, and the importance of
change traceability, this commit has been done in such a way that it is
possible to perform a three-way diff from initial http_ntlm.[ch] to resulting
http_ntlm.[ch] and curl_ntlm.[ch] to actually verify that no functional change
is introduced here.

Notice that Steve Holme has provided several patches, but these included this
refactoring along with 'extra' fixes. I really wanted this 'clean' refactoring
done first, in order to allow discussion or committing of 'extra' fixes on a
case by case basis, so, I had to bite the bullet ;-)

Comments, line adjustments, compiler warning fixes, whatever, may follow
afterwards.

lib/Makefile.inc

@@ -22,7 +22,7 @@ CSOURCES = file.c timeval.c base64.c hostip.c progress.c formdata.c	\
   pingpong.c rtsp.c curl_threads.c warnless.c hmac.c polarssl.c		\
   curl_rtmp.c openldap.c curl_gethostname.c gopher.c axtls.c		\
   idn_win32.c http_negotiate_sspi.c cyassl.c http_proxy.c non-ascii.c	\
-  asyn-ares.c asyn-thread.c curl_gssapi.c
+  asyn-ares.c asyn-thread.c curl_gssapi.c curl_ntlm.c
 
 HHEADERS = arpa_telnet.h netrc.h file.h timeval.h qssl.h hostip.h	\
   progress.h formdata.h cookie.h http.h sendf.h ftp.h url.h dict.h	\

lib/Makefile.vc6

@@ -472,6 +472,7 @@ X_OBJS= \
 	$(DIROBJ)\curl_fnmatch.obj \
 	$(DIROBJ)\curl_gethostname.obj \
 	$(DIROBJ)\curl_memrchr.obj \
+	$(DIROBJ)\curl_ntlm.obj \
 	$(DIROBJ)\curl_rand.obj \
 	$(DIROBJ)\curl_rtmp.obj \
 	$(DIROBJ)\curl_sspi.obj \

lib/curl_ntlm.h

@@ -24,6 +24,31 @@
 
 #ifdef USE_NTLM
 
+/* This is to generate a ntlm type-1 message */
+CURLcode Curl_ntlm_create_type1_message(const char *userp,
+                                        const char *passwdp,
+                                        struct ntlmdata *ntlm,
+                                        unsigned char *ntlmbuf,
+                                        size_t *size);
+
+/* This is to generate a ntlm type-3 message */
+CURLcode Curl_ntlm_create_type3_message(struct SessionHandle *data,
+                                        const char *userp,
+                                        const char *passwdp,
+                                        struct ntlmdata *ntlm,
+                                        unsigned char *ntlmbuf,
+                                        size_t *size);
+
+/* This is to decode a ntlm type-2 message */
+CURLcode Curl_ntlm_decode_type2_message(struct SessionHandle *data,
+                                        const char* header,
+                                        struct ntlmdata* ntlm);
+
+/* This is to clean up the ntlm data structure */
+#ifdef USE_WINDOWS_SSPI
+void Curl_ntlm_sspi_cleanup(struct ntlmdata *ntlm);
+#endif
+
 /* NTLM buffer fixed size, large enough for long user + host + domain */
 #define NTLM_BUFSIZE 1024