online_distribution/eventlibraries/PHmd5Value.h

0001 #ifndef __PHMD5VALUE_H__
0002 #define __PHMD5VALUE_H__
0003
0004 /**
0005 This is a simple class maintaining a md5 checksum value for us.
0006 It is geared towards the md5 value from files, and accepts
0007 filenames, a FILE * in its constructor.
0008
0009 It is made so that it gives the same result as the UNIX md5sum command.
0010
0011 I used and modified the md5_stream routine in the GNU textutils package
0012 (which has a larger scope and doesn't compile easily with non-GNU
0013 compilers).
0014
0015 I used the "MD5 message digest library" written by L. Peter Deutsch
0016 (ghost@aladdin.com) to actually compute the MD5 sums. This package
0017 compiles happily on all platforms, including Sun/Solaris w/ native
0018 compiler.
0019
0020 */
0021
0022 #include "PHmd5Utils.h"
0023
0024 #define PHMD5DIGESTLENGTH 16
0025 #include "event_io.h"
0026
0027
0028 #define WINDOWSEXPORT
0029
0030
0031 #ifndef __CINT__
0032 class WINDOWSEXPORT  PHmd5Value {
0033 #else
0034 class   PHmd5Value {
0035 #endif
0036  public:
0037   /// construct an "empty" object
0038   PHmd5Value();
0039
0040   /// the copy constructor
0041   PHmd5Value(const PHmd5Value &);
0042
0043   /// give an open file pointer to gte the checksum of that file
0044   PHmd5Value(FILE *fp);
0045
0046   /// give a filename to get the MD5 sum of that file
0047   PHmd5Value(const char *filename);
0048
0049   // and the destructor
0050   ~PHmd5Value();
0051
0052   /// The Status() is 0 if the md5 could be computed alright.
0053   int Status() const;
0054
0055   /// overload the == operator to tell if two MD5 sums are equal
0056   int operator== (const PHmd5Value &) const;
0057
0058   /// copy the digest to the "digest" parameter
0059   int getMD5(unsigned char * digest) const;
0060
0061   /// set a new digest value from the argument
0062   int setMD5(const unsigned char * digest);
0063
0064   /// if we change the file, this allows to update the MD5 sum
0065   int setFileMD5(const char * filename);
0066
0067   /// this is for convenience -- once we digest the file, we might
0068     /// as well remember its size to get back at it later.
0069   int FileSize() const;
0070
0071   /// define the ostream >> operator
0072   friend OSTREAM & operator<< ( OSTREAM &, const PHmd5Value &);
0073
0074  protected:
0075   unsigned char theDigest[PHMD5DIGESTLENGTH];
0076   int isNotValid; // here we indicate that an actual value has been set alright (0);
0077   int filesize;
0078 };
0079
0080
0081
0082 #endif /* __PHMD5VALUE_H__ */