1 files changed, 96 insertions, 0 deletions
diff --git a/llong.c b/llong.c
new file mode 100644
index 0000000..a1eaeec
--- /dev/null
+++ b/llong.c
@@ -0,0 +1,96 @@
+/*  Copyright 1999-2003,2006,2008,2009 Alain Knaff.
+ *  This file is part of mtools.
+ *
+ *  Mtools is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Mtools is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Mtools.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "sysincludes.h"
+#include "stream.h"
+#include "fsP.h"
+#include "llong.h"
+#include "mtools.h"
+
+#if 1
+const mt_off_t max_off_t_31 = MAX_OFF_T_B(31); /* Floppyd */
+const mt_off_t max_off_t_32 = MAX_OFF_T_B(32); /* Directory */
+const mt_off_t max_off_t_41 = MAX_OFF_T_B(41); /* SCSI */
+const mt_off_t max_off_t_seek = MAX_OFF_T_B(SEEK_BITS); /* SCSI */
+#else
+const mt_off_t max_off_t_31 = MAX_OFF_T_B(10); /* Floppyd */
+const mt_off_t max_off_t_41 = MAX_OFF_T_B(10); /* SCSI */
+const mt_off_t max_off_t_seek = MAX_OFF_T_B(10); /* SCSI */
+#endif
+
+int fileTooBig(mt_off_t off) {
+	return (off & ~max_off_t_32) != 0;
+}
+
+off_t truncBytes32(mt_off_t off)
+{
+	if (fileTooBig(off)) {
+		fprintf(stderr, "Internal error, offset too big\n");
+		exit(1);
+	}
+	return (off_t) off;
+}
+
+mt_off_t sectorsToBytes(Stream_t *Stream, off_t off)
+{
+	DeclareThis(Fs_t);
+	return (mt_off_t) off << This->sectorShift;
+}
+
+#if defined HAVE_LLSEEK
+# ifndef HAVE_LLSEEK_PROTOTYPE
+extern long long llseek (int fd, long long offset, int origin);
+# endif
+#endif
+
+#if defined HAVE_LSEEK64
+# ifndef HAVE_LSEEK64_PROTOTYPE
+extern long long lseek64 (int fd, long long offset, int origin);
+# endif
+#endif
+
+
+int mt_lseek(int fd, mt_off_t where, int whence)
+{
+#if defined HAVE_LSEEK64
+	if(lseek64(fd, where, whence) >= 0)
+		return 0;
+	else
+		return -1;
+#elif defined HAVE_LLSEEK
+	if(llseek(fd, where, whence) >= 0)
+		return 0;
+	else
+		return -1;		
+#else
+	if (lseek(fd, (off_t) where, whence) >= 0)
+		return 0;
+	else
+		return 1;
+#endif
+}
+
+unsigned int log_2(int size)
+{
+	unsigned int i;
+
+	for(i=0; i<24; i++) {
+		if(1 << i == size)
+			return i;
+	}
+	return 24;
+}