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before anything else. Internally, this function compiles all regular expressions, avoiding to that inside the regexp constructore. The code is a bit hackish due to the way the regexp code depends on the Bro header.
76 lines
1.5 KiB
C++
76 lines
1.5 KiB
C++
#ifndef binpac_regex_h
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#define binpac_regex_h
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#include "binpac.h"
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#include "RE.h"
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class RE_Matcher;
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namespace binpac
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{
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// Internal vector recording not yet compiled matchers.
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extern std::vector<RE_Matcher*>* uncompiled_re_matchers;
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class RegExMatcher {
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public:
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RegExMatcher(const char *pattern)
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: pattern_(pattern)
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{
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if ( ! uncompiled_re_matchers )
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uncompiled_re_matchers = new std::vector<RE_Matcher*>;
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re_matcher_ = new RE_Matcher(pattern_.c_str());
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uncompiled_re_matchers->push_back(re_matcher_);
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}
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~RegExMatcher()
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{
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delete re_matcher_;
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}
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// Returns the length of longest match, or -1 on mismatch.
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int MatchPrefix(const_byteptr data, int len)
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{
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return re_matcher_->MatchPrefix(data, len);
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}
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private:
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friend void ::binpac::init();
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// Function, and state, for compiling matchers.
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static void init();
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string pattern_;
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RE_Matcher *re_matcher_;
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};
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inline void RegExMatcher::init()
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{
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if ( ! uncompiled_re_matchers )
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return;
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for ( size_t i = 0; i < uncompiled_re_matchers->size(); ++i )
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{
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if ( ! (*uncompiled_re_matchers)[i]->Compile() )
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{
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fprintf(stderr, "binpac: cannot compile regular expression\n");
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exit(1);
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}
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}
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uncompiled_re_matchers->clear();
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}
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// Must be called before any binpac functionality is used.
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//
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// Note, this must be defined here, and inline, because the RE functionality
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// can only be used when compiling from inside Bro.
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inline void init()
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{
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RegExMatcher::init();
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}
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} // namespace binpac
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#endif // binpac_regex_h
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