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>

1 files changed, 65 insertions, 59 deletions

diff --git a/lib/consumer.cc b/lib/consumer.cc
index ff5da91..df95b64 100644
--- a/lib/consumer.cc
+++ b/lib/consumer.cc
@@ -7,27 +7,65 @@
 #include <openssl/sha.h>
 #include <openssl/hmac.h>
 #include <curl/curl.h>
 
 #include <iostream>
 
 #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;
 
             curl_t() : _c(0) { }
             curl_t(CURL *c) : _c(c) { }
             ~curl_t() throw() { if(_c) curl_easy_cleanup(_c); }
 
@@ -263,17 +301,16 @@ namespace opkele {
         }else if(pp.has_param("lifetime")) {
             if(util::string_to_long(pp.get_param("lifetime")))
                 return;
         }
         throw failed_check_authentication(OPKELE_CP_ "failed to verify response");
     }
 
     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();
         if(!curl)
             throw exception_curl(OPKELE_CP_ "failed to curl_easy_init()");
         string html;
         CURLcode r;
         (r=curl_misc_sets(curl))
@@ -281,77 +318,46 @@ namespace opkele {
         || (r=curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,_curl_tostring))
         || (r=curl_easy_setopt(curl,CURLOPT_WRITEDATA,&html))
         ;
         if(r)
             throw exception_curl(OPKELE_CP_ "failed to curl_easy_setopt()",r);
         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) {
         throw failed_lookup(OPKELE_CP_ "no find_assoc() provided");
     }
 
     string consumer_t::normalize(const string& url) {
         string rv = url;