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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>
This commit is contained in:
Daniel Drake 2019-12-16 13:48:56 +08:00
parent 3d3280ef15
commit 1f10f4afec
3 changed files with 60 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
disk-utils/isosize.c
View File

@ -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;

1
include/Makemodule.am
View File

@ -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 \

58
include/iso9660.h Normal file
View File

@ -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