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#ifndef PL_MD5_HH
#define PL_MD5_HH
// This pipeline sends its output to its successor unmodified. After calling finish, the MD5
// checksum of the data that passed through the pipeline is available.
// This pipeline is reusable; i.e., it is safe to call write() after calling finish(). The first
// call to write() after a call to finish() initializes a new MD5 object.
#include <qpdf/MD5.hh>
#include <qpdf/Pipeline.hh>
class Pl_MD5: public Pipeline
{
public:
Pl_MD5(char const* identifier, Pipeline* next);
~Pl_MD5() override = default;
void write(unsigned char const*, size_t) override;
void finish() override;
std::string getHexDigest();
// Enable/disable. Disabling the pipeline causes it to become a pass-through. This makes it
// possible to stick an MD5 pipeline in a pipeline when it may or may not be required. Disabling
// it avoids incurring the runtime overhead of doing needless digest computation.
void enable(bool enabled);
// If persistAcrossFinish is called, calls to finish do not finalize the underlying md5 object.
// In this case, the object is not finalized until getHexDigest() is called.
void persistAcrossFinish(bool);
private:
bool in_progress;
MD5 md5;
bool enabled;
bool persist_across_finish;
};
#endif // PL_MD5_HH
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