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iso9660*.{c,h}: Add PVD read for ISO 9660 images.

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iso-info now shows this info.
This commit is contained in:
rocky
2004-06-19 00:10:23 +00:00
parent b2f2e45d8c
commit f126d236aa
3 changed files with 61 additions and 24 deletions
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44
lib/iso9660_fs.c
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@@ -1,5 +1,5 @@
/*
$Id: iso9660_fs.c,v 1.19 2004/03/21 00:51:49 rocky Exp $
$Id: iso9660_fs.c,v 1.20 2004/06/19 00:10:23 rocky Exp $
Copyright (C) 2001 Herbert Valerio Riedel <hvr@gnu.org>
Copyright (C) 2003, 2004 Rocky Bernstein <rocky@panix.com>
@@ -40,7 +40,7 @@
#include <stdio.h>
static const char _rcsid[] = "$Id: iso9660_fs.c,v 1.19 2004/03/21 00:51:49 rocky Exp $";
static const char _rcsid[] = "$Id: iso9660_fs.c,v 1.20 2004/06/19 00:10:23 rocky Exp $";
/* Implementation of iso9660_t type */
struct _iso9660 {
@@ -76,28 +76,50 @@ iso9660_open (const char *pathname /*flags, mode */)
be returned.
*/
bool
iso9660_close (iso9660_t *iso)
iso9660_close (iso9660_t *p_iso)
{
if (NULL != iso) {
cdio_stdio_destroy(iso->stream);
free(iso);
if (NULL != p_iso) {
cdio_stdio_destroy(p_iso->stream);
free(p_iso);
}
return true;
}
/*!
Read the Primary Volume Descriptor for an ISO 9660 image.
*/
bool iso9660_iso_read_pvd (iso9660_t *p_iso, iso9660_pvd_t *p_pvd)
{
if (0 == iso9660_iso_seek_read (p_iso, p_pvd, ISO_PVD_SECTOR, 1)) {
cdio_warn ("error reading PVD sector (%d)", ISO_PVD_SECTOR);
return false;
}
if (p_pvd->type != ISO_VD_PRIMARY) {
cdio_warn ("unexpected PVD type %d", p_pvd->type);
return false;
}
if (strncmp (p_pvd->id, ISO_STANDARD_ID, strlen (ISO_STANDARD_ID)))
{
cdio_warn ("unexpected ID encountered (expected `"
ISO_STANDARD_ID "', got `%.5s'", p_pvd->id);
return false;
}
return true;
}
/*!
Seek to a position and then read n blocks. Size read is returned.
*/
long int
iso9660_iso_seek_read (iso9660_t *iso, void *ptr, lsn_t start, long int size)
iso9660_iso_seek_read (iso9660_t *p_iso, void *ptr, lsn_t start, long int size)
{
long int ret;
if (NULL == iso) return 0;
ret = cdio_stream_seek (iso->stream, start * ISO_BLOCKSIZE, SEEK_SET);
if (NULL == p_iso) return 0;
ret = cdio_stream_seek (p_iso->stream, start * ISO_BLOCKSIZE, SEEK_SET);
if (ret!=0) return 0;
return cdio_stream_read (iso->stream, ptr, ISO_BLOCKSIZE, size);
return cdio_stream_read (p_iso->stream, ptr, ISO_BLOCKSIZE, size);
}