isosize: move ISO size functions into a shared header

Move the helper functions that parse ISO data & sector size info into
a separate, shared header.

These will addtionally be used by libblkid's iso9660 parser.

Signed-off-by: Daniel Drake <drake@endlessm.com>

disk-utils/isosize.c

@@ -29,6 +29,7 @@
 #include "c.h"
 #include "strutils.h"
 #include "closestream.h"
+#include "iso9660.h"
 
 #define ISOSIZE_EXIT_ALLFAILED	32
 #define ISOSIZE_EXIT_SOMEOK	64
@@ -42,56 +43,6 @@ static int is_iso(int fd)
 	return memcmp(&label, &"\1CD001\1", 8);
 }
 
-static int isonum_721(unsigned char *p)
-{
-	return ((p[0] & 0xff)
-		| ((p[1] & 0xff) << 8));
-}
-
-static int isonum_722(unsigned char *p)
-{
-	return ((p[1] & 0xff)
-		| ((p[0] & 0xff) << 8));
-}
-
-static int isonum_723(unsigned char *p, int xflag)
-{
-	int le = isonum_721(p);
-	int be = isonum_722(p + 2);
-
-	if (xflag && le != be)
-		/* translation is useless */
-		warnx("723error: le=%d be=%d", le, be);
-	return (le);
-}
-
-static int isonum_731(unsigned char *p)
-{
-	return ((p[0] & 0xff)
-		| ((p[1] & 0xff) << 8)
-		| ((p[2] & 0xff) << 16)
-		| ((p[3] & 0xff) << 24));
-}
-
-static int isonum_732(unsigned char *p)
-{
-	return ((p[3] & 0xff)
-		| ((p[2] & 0xff) << 8)
-		| ((p[1] & 0xff) << 16)
-		| ((p[0] & 0xff) << 24));
-}
-
-static int isonum_733(unsigned char *p, int xflag)
-{
-	int le = isonum_731(p);
-	int be = isonum_732(p + 4);
-
-	if (xflag && le != be)
-		/* translation is useless */
-		warnx("733error: le=%d be=%d", le, be);
-	return (le);
-}
-
 static int isosize(int argc, char *filenamep, int xflag, long divisor)
 {
 	int fd, nsecs, ssize, rc = -1;

include/Makemodule.am

@@ -22,6 +22,7 @@ dist_noinst_HEADERS += \
 	include/fileutils.h \
 	include/idcache.h \
 	include/ismounted.h \
+	include/iso9660.h \
 	include/pwdutils.h \
 	include/linux_version.h \
 	include/list.h \

include/iso9660.h

@@ -0,0 +1,58 @@
+#ifndef UTIL_LINUX_ISO_H
+#define UTIL_LINUX_ISO_H
+
+#include <stdbool.h>
+
+#include "c.h"
+
+static inline int isonum_721(unsigned char *p)
+{
+	return ((p[0] & 0xff)
+		| ((p[1] & 0xff) << 8));
+}
+
+static inline int isonum_722(unsigned char *p)
+{
+	return ((p[1] & 0xff)
+		| ((p[0] & 0xff) << 8));
+}
+
+static inline int isonum_723(unsigned char *p, bool check_match)
+{
+	int le = isonum_721(p);
+	int be = isonum_722(p + 2);
+
+	if (check_match && le != be)
+		/* translation is useless */
+		warnx("723error: le=%d be=%d", le, be);
+	return (le);
+}
+
+static inline int isonum_731(unsigned char *p)
+{
+	return ((p[0] & 0xff)
+		| ((p[1] & 0xff) << 8)
+		| ((p[2] & 0xff) << 16)
+		| ((p[3] & 0xff) << 24));
+}
+
+static inline int isonum_732(unsigned char *p)
+{
+	return ((p[3] & 0xff)
+		| ((p[2] & 0xff) << 8)
+		| ((p[1] & 0xff) << 16)
+		| ((p[0] & 0xff) << 24));
+}
+
+static inline int isonum_733(unsigned char *p, bool check_match)
+{
+	int le = isonum_731(p);
+	int be = isonum_732(p + 4);
+
+	if (check_match && le != be)
+		/* translation is useless */
+		warnx("733error: le=%d be=%d", le, be);
+	return(le);
+}
+
+#endif