got rid of all pcre wrappers altogether

although all claims against pcre++ make absolutely no sense. But for now I'll
live with no wrappers at all. I may reconsider it when implementing more
sophisticated discovery mechanisms for upcoming extensions.

Signed-off-by: Michael Krelin <hacker@klever.net>

5 files changed, 80 insertions, 106 deletions

diff --git a/configure.ac b/configure.ac
index 00c6bc4..53e22ba 100644
--- a/configure.ac
+++ b/configure.ac
@@ -53,50 +53,9 @@ LIBCURL_CHECK_CONFIG(,,,[
  AC_MSG_ERROR([no required libcurl library. get one from http://curl.haxx.se/])
 ])
 
-want_pcre_impl=""
-AC_ARG_WITH([pcre-bindings],
- AC_HELP_STRING([--with-pcre-bindings=(pcrepp|none|libpcrecpp)],[Specify which pcre c++ bindings to use. 'pcrepp' stands for quite sensible library, found at http://www.daemon.de/PCRE/, 'libcrecpp' makes use of crappy bindings by google and 'none' disables internal implementation of OP discovery]),
- [
-  case "$withval" in
-   pcrepp) want_pcre_impl="pcrepp" ;;
-   libpcrecpp) want_pcre_impl="libpcrecpp" ;;
-   none) want_pcre_impl="none";;
-   *) AC_MSG_ERROR([I'm not sure I understand what do you want for a pcre c++ bindings]) ;;
-  esac
- ]
-)
-
-found_pcre_impl=""
-
-if test -z "$want_pcre_impl" -o "$want_pcre_impl" = "pcrepp" ; then
- AC_WITH_PCRE([
-   AC_WITH_PCREPP([
-    found_pcre_impl=pcrepp
-   ])
-  ],[
-   AC_MSG_ERROR([no pcre library found. get one at http://www.pcre.org/])
-  ]
- )
- test "$want_pcre_impl,$found_pcre_impl" = "pcrepp," && AC_MSG_ERROR([no pcre++ library found. get one at http://www.daemon.de/PCRE])
-fi
-
-if test "$found_pcre_impl,$want_pcre_impl" = "," -o "$want_pcre_impl" = "libpcrecpp" ; then
- test -z "$want_pcre_impl" || AC_MSG_NOTICE([You want to use crappy libpcre c++ bindings])
- PKG_CHECK_MODULES([LIBPCRECPP],[libpcrecpp],[
-   found_pcre_impl=libpcrecpp
-   CXXFLAGS="$CXXFLAGS $LIBPCRECPP_CFLAGS"
-   LIBS="$LIBS $LIBPCRECPP_LIBS"
-  ],[
-   test -z "$want_pcre_impl" || AC_MSG_ERROR([no libpcre c++ bindings found. why would you want it if you don't have it installed?])
-  ]
- )
-fi
-test "$want_pcre_impl,$found_pcre_impl" = "," && AC_MSG_ERROR([no pcre c++ bindings found, use --with-pcre-bindings=none to disable code that makes use of it])
-
-case "$found_pcre_impl" in
- pcrepp) AC_DEFINE([USE_PCREPP],,[defined if pcre++ is to be used]) ;;
- libpcrecpp) AC_DEFINE([USE_LIBPCRECPP],,[defined if crappy google bindings are to be used]) ;;
-esac
+PKG_CHECK_MODULES([PCRE],[libpcre],,[
+ AC_MSG_ERROR([no libpcre found, go get it at http://www.pcre.org/])
+])
 
 curl_ssl_verify_host="true"
 AC_ARG_ENABLE([ssl-verify-host],
diff --git a/include/opkele/exception.h b/include/opkele/exception.h
index 0150e6b..753a818 100644
--- a/include/opkele/exception.h
+++ b/include/opkele/exception.h
@@ -212,6 +212,15 @@ namespace opkele {
                 : exception(OPKELE_E_CONS) { }
     };
 
+    /**
+     * internal error, indicates internal libopkele problem
+     */
+    class internal_error : public exception {
+        public:
+            internal_error(OPKELE_E_PARS)
+                : exception(OPKELE_E_CONS) { }
+    };
+
 }
 
 #endif /* __OPKELE_EXCEPTION_H */
diff --git a/lib/Makefile.am b/lib/Makefile.am
index a68faf6..b008a52 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -5,10 +5,10 @@ INCLUDES = \
            ${KONFORKA_CFLAGS} \
            ${OPENSSL_CFLAGS} \
            ${LIBCURL_CPPFLAGS} \
-           ${PCREPP_CFLAGS}
+           ${PCRE_CFLAGS}
 libopkele_la_LIBADD = \
         ${LIBCURL} \
-        ${PCREPP_LIBS} \
+        ${PCRE_LIBS} \
         ${OPENSSL_LIBS} \
         ${KONFORKA_LIBS}
 
diff --git a/lib/consumer.cc b/lib/consumer.cc
index ff5da91..df95b64 100644
--- a/lib/consumer.cc
+++ b/lib/consumer.cc
@@ -12,17 +12,55 @@
 
 #include "config.h"
 
-#if defined(USE_LIBPCRECPP)
-# include <pcrecpp.h>
-#elif defined(USE_PCREPP)
-# include <pcre++.h>
-#else
- /* internal implementation won't be built */
-#endif
+#include <pcre.h>
 
 namespace opkele {
     using namespace std;
 
+    class pcre_matches_t {
+        public:
+            int *_ov;
+            int _s;
+
+            pcre_matches_t() : _ov(0), _s(0) { }
+            pcre_matches_t(int s) : _ov(0), _s(s) {
+                if(_s&1) ++_s;
+                _s += _s>>1;
+                _ov = new int[_s];
+            }
+            ~pcre_matches_t() throw() { if(_ov) delete[] _ov; }
+
+            int begin(int i) const { return _ov[i<<1]; }
+            int end(int i) const { return _ov[(i<<1)+1]; }
+            int length(int i) const { int t=i<<1; return _ov[t+1]-_ov[t]; }
+    };
+
+    class pcre_t {
+        public:
+            pcre *_p;
+
+            pcre_t() : _p(0) { }
+            pcre_t(pcre *p) : _p(p) { }
+            pcre_t(const char *re,int opts) : _p(0) {
+                static const char *errptr; static int erroffset;
+                _p = pcre_compile(re,opts,&errptr,&erroffset,NULL);
+                if(!_p)
+                    throw internal_error(OPKELE_CP_ string("Failed to compile regexp: ")+errptr);
+            }
+            ~pcre_t() throw() { if(_p) (*pcre_free)(_p); }
+
+            pcre_t& operator=(pcre *p) { if(_p) (*pcre_free)(_p); _p=p; return *this; }
+
+            operator const pcre*(void) const { return _p; }
+            operator pcre*(void) { return _p; }
+
+            int exec(const string& s,pcre_matches_t& m) {
+                if(!_p)
+                    throw internal_error(OPKELE_CP_ "Trying to execute absent regexp");
+                return pcre_exec(_p,NULL,s.c_str(),s.length(),0,0,m._ov,m._s);
+            }
+    };
+
     class curl_t {
         public:
             CURL *_c;
@@ -268,7 +306,6 @@ namespace opkele {
     }
 
     void consumer_t::retrieve_links(const string& url,string& server,string& delegate) {
-#if defined(USE_LIBPCRECPP) || defined(USE_PCREPP)
         server.erase();
         delegate.erase();
         curl_t curl = curl_easy_init();
@@ -286,67 +323,36 @@ namespace opkele {
         r = curl_easy_perform(curl);
         if(r && r!=CURLE_WRITE_ERROR)
             throw exception_curl(OPKELE_CP_ "failed to curl_easy_perform()",r);
-        // strip out everything past body
-        static const char *re_hdre = "<\\s*head[^>]*>",
+        static const char *re_bre = "<\\s*body\\b", *re_hdre = "<\\s*head[^>]*>",
                      *re_lre = "<\\s*link\\b([^>]+)>",
                      *re_rre = "\\brel\\s*=\\s*['\"]\\s*([^'\"\\s]+)\\s*['\"]",
                      *re_hre = "\\bhref\\s*=\\s*['\"]\\s*([^'\"\\s]+)\\s*['\"]";
-#if defined(USE_LIBPCRECPP)
-        static pcrecpp::RE_Options ro(PCRE_CASELESS|PCRE_DOTALL);
-        static pcrecpp::RE
-            bre("<body\\b.*",ro), hdre(re_hdre,ro),
-            lre(re_lre,ro), rre(re_rre), hre(re_hre,ro);
-        bre.Replace("",&html);
-        pcrecpp::StringPiece hpiece(html);
-        if(!hdre.FindAndConsume(&hpiece))
-            throw bad_input(OPKELE_CP_ "failed to find head");
-        string attrs;
-        while(lre.FindAndConsume(&hpiece,&attrs)) {
-            pcrecpp::StringPiece rel, href;
-            if(!(rre.PartialMatch(attrs,&rel) && hre.PartialMatch(attrs,&href)))
+        pcre_matches_t m1(3), m2(3);
+        pcre_t bre(re_bre,PCRE_CASELESS);
+        if(bre.exec(html,m1)>0)
+            html.erase(m1.begin(0));
+        pcre_t hdre(re_hdre,PCRE_CASELESS);
+        if(hdre.exec(html,m1)<=0)
+            throw bad_input(OPKELE_CP_ "failed to find <head>");
+        html.erase(0,m1.end(0)+1);
+        pcre_t lre(re_lre,PCRE_CASELESS), rre(re_rre,PCRE_CASELESS), hre(re_hre,PCRE_CASELESS);
+        while(lre.exec(html,m1)>=2) {
+            string attrs(html,m1.begin(1),m1.length(1));
+            html.erase(0,m1.end(0)+1);
+            if(!( rre.exec(attrs,m1)>=2 && hre.exec(attrs,m2)>=2 ))
                 continue;
+            string rel(attrs,m1.begin(1),m1.length(1));
+            string href(attrs,m2.begin(1),m2.length(1));
             if(rel=="openid.server") {
-                href.CopyToString(&server);
-                if(!delegate.empty())
-                    break;
+                server = href;
+                if(!delegate.empty()) break;
             }else if(rel=="openid.delegate") {
-                href.CopyToString(&delegate);
-                if(!server.empty())
-                    break;
-            }
-        }
-#elif defined(USE_PCREPP)
-        pcrepp::Pcre bre("<body\\b",PCRE_CASELESS);
-        if(bre.search(html))
-            html.erase(bre.get_match_start());
-        pcrepp::Pcre hdre(re_hdre,PCRE_CASELESS);
-        if(!hdre.search(html))
-            throw bad_input(OPKELE_CP_ "failed to find head");
-        html.erase(0,hdre.get_match_end()+1);
-        pcrepp::Pcre lre(re_lre,PCRE_CASELESS), rre(re_rre,PCRE_CASELESS), hre(re_hre,PCRE_CASELESS);
-        while(lre.search(html)) {
-            string attrs = lre[0];
-            html.erase(0,lre.get_match_end()+1);
-            if(!(rre.search(attrs)&&hre.search(attrs)))
-                continue;
-            if(rre[0]=="openid.server") {
-                server = hre[0];
-                if(!delegate.empty())
-                    break;
-            }else if(rre[0]=="openid.delegate") {
-                delegate = hre[0];
-                if(!server.empty())
-                    break;
+                delegate = href;
+                if(!server.empty()) break;
             }
         }
-#else
-        #error "I must have gone crazy"
-#endif
         if(server.empty())
             throw failed_assertion(OPKELE_CP_ "The location has no openid.server declaration");
-#else /* none of the RE bindings enabled */
-        throw not_implemented(OPKELE_CP_ "No internal implementation of retrieve_links were provided at compile-time");
-#endif
     }
 
     assoc_t consumer_t::find_assoc(const string& server) {
diff --git a/libopkele.pc.in b/libopkele.pc.in
index 286720e..5f8684b 100644
--- a/libopkele.pc.in
+++ b/libopkele.pc.in
@@ -6,6 +6,6 @@ includedir=@includedir@
 Name: libopkele
 Description: C++ implementation of OpenID protocol
 Version: @VERSION@
-Requires: openssl @KONFORKA_KONFORKA@
+Requires: openssl libpcre @KONFORKA_KONFORKA@
 Cflags: -I${includedir} @LIBCURL_CPPFLAGS@ @PCREPP_CFLAGS@
 Libs: -L${libdir} -lopkele @LIBCURL@ @PCREPP_LIBS@