initial commit0.1

1 files changed, 64 insertions, 0 deletions

diff --git a/inode.h b/inode.h
new file mode 100644
index 0000000..3040e71
--- /dev/null
+++ b/inode.h
@@ -0,0 +1,64 @@
+#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;
+}