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#include <string>
#include <ostream>
#include <fstream>
#include <cstring>
#include <sys/stat.h>
#include <sys/types.h>
#include <zlib.h>
class inode {
public:
std::string const filename;
struct stat const stat;
protected:
uLong mutable adler;
public:
inode (std::string const &, struct stat const);
uLong get_adler () const;
friend bool compare (inode const &, inode const &);
friend std::ostream& operator<< (std::ostream&, inode const &);
};
inline inode::inode (std::string const & __filename, struct stat const __stat) : filename(__filename), stat(__stat), adler(-1) {
}
inline uLong inode::get_adler () const {
if (adler == uLong(-1)) {
char buffer[1 << 14];
std::ifstream f(filename.c_str());
adler = adler32(0L, Z_NULL, 0);
while (not f.eof()) {
f.read(buffer, sizeof(buffer));
adler = adler32(adler, (Bytef *) buffer, f.gcount());
}
}
return adler;
}
inline bool compare (inode const & l, inode const & r) {
char lbuffer[1 << 14];
char rbuffer[1 << 14];
std::ifstream lf(l.filename.c_str());
std::ifstream rf(r.filename.c_str());
while (not lf.eof()) {
lf.read(lbuffer, sizeof(lbuffer));
rf.read(rbuffer, sizeof(rbuffer));
if (lf.gcount() != rf.gcount())
return false;
if (memcmp(lbuffer, rbuffer, lf.gcount()))
return false;
}
return true;
}
inline std::ostream& operator<< (std::ostream& os, inode const & i) {
os << "Inode " << i.stat.st_ino << ", represented by " << i.filename;
return os;
}
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