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76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
// See the file "COPYING" in the main distribution directory for copyright.
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#ifndef binpac_regex_h
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#define binpac_regex_h
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#include <vector>
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#include "zeek/RE.h"
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#include "binpac.h"
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namespace zeek {
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class RE_Matcher;
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}
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namespace binpac {
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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 declared/defined here, and inline, because the RE
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// functionality can only be used when compiling from inside Zeek.
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// A copy is made of any FlowBuffer policy struct data passed.
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inline void init(FlowBuffer::Policy* fbp = nullptr);
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// Internal vector recording not yet compiled matchers.
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extern std::vector<zeek::RE_Matcher*>* uncompiled_re_matchers;
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class RegExMatcher {
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public:
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RegExMatcher(const char* pattern) : pattern_(pattern) {
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if ( ! uncompiled_re_matchers )
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uncompiled_re_matchers = new std::vector<zeek::RE_Matcher*>;
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re_matcher_ = new zeek::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() { delete re_matcher_; }
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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) { return re_matcher_->MatchPrefix(data, len); }
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private:
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friend void ::binpac::init(FlowBuffer::Policy*);
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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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zeek::RE_Matcher* re_matcher_;
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};
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inline void RegExMatcher::init() {
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if ( ! uncompiled_re_matchers )
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return;
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for ( const auto& matcher : *uncompiled_re_matchers ) {
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if ( ! matcher->Compile() ) {
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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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inline void init(FlowBuffer::Policy* fbp) {
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RegExMatcher::init();
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if ( fbp )
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FlowBuffer::init(*fbp);
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}
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} // namespace binpac
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#endif // binpac_regex_h
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