[Add] Time stamp checking for files.

src/System/Filesystem/FileTimestampChecker.cpp

@@ -0,0 +1,82 @@
+#include <assert.h>
+#include <fcntl.h>
+#include <time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "InputStreamWrapper.h"
+#include "FileTimestampChecker.h"
+
+using namespace saracraft;
+
+/*bool FileTimestampChecker::IsFileNewerThanFile(const char* file, const char* secondFile) {
+  assert
+}*/
+
+bool FileTimestampChecker::IsFileNewerOrSameThanFile(const char* file, const char* secondfile) {
+  if(GetFileTimestamp(file) >= GetFileTimestamp(secondfile))
+    return true;
+  else
+    return false;
+}
+
+bool FileTimestampChecker::IsFileNewerOrAlmostSameThanFile(const char* file, const char* secondfile) {
+  // WARNING: Max 60 seconds older file is also accepted as newer..
+  if(GetFileTimestamp(file) + 60 >= GetFileTimestamp(secondfile))
+    return true;
+  else
+    return false;
+}
+
+bool FileTimestampChecker::IsFileUpToDateComparedTo(const char* file, const char* secondfile) {
+  FILE* f = fopen(file, "rb");
+  if(f) {
+    fclose(f);
+    return FileTimestampChecker::IsFileNewerOrAlmostSameThanFile(file, secondfile);
+  }
+
+  filesystem::SC_FILE* fp = filesystem::sc_fopen(file, "rb");
+  if(fp) {
+    filesystem::sc_fclose(fp);
+    return true;
+  }
+  return false;
+}
+
+
+#ifndef _MSC_VER
+#define _stat stat
+
+#ifndef _WIN32_
+#define _fileno fileno
+#endif
+
+#define _fstat fstat
+#endif
+
+
+int FileTimestampChecker::GetFileTimestamp(const char* file) {
+  struct _stat buf;
+  FILE* f;
+  int fh, result;
+  int ret;
+
+  f = fopen(file, "rb");
+  if(f == NULL) return -1;
+
+  fh = _fileno(f);
+
+  result = _fstat(fh, &buf);
+
+  if(result != 0) {
+    return -1;
+  } else {
+    ret = int(buf.st_mtime);
+  }
+  fclose(f);
+  return ret;
+}
+

src/System/Filesystem/FileTimestampChecker.h

@@ -0,0 +1,17 @@
+#pragma once
+
+class FileTimestampChecker {
+public:
+  // Check if the given file with given name has been modified after another
+  // file of given name.
+  // Return true if file *IS* newer.
+
+  // This is not needed....
+  //static bool IsFileNewerThanFile(const char* file, const char* secondfile);
+  static bool IsFileNewerOrSameThanFile(const char* file, const char* secondfile);
+  static bool IsFileNewerOrAlmostSameThanFile(const char* file, const char* secondfile);
+  static bool IsFileUpToDateComparedTo(const char* file, const char* secondfile);
+
+  static int GetFileTimestamp(const char *file);
+};
+