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rufus/src/libcdio/driver/sector.c

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/*
Copyright (C) 2004, 2005, 2011, 2012, 2014 Rocky Bernstein <rocky@gnu.org>
Copyright (C) 2000 Herbert Valerio Riedel <hvr@gnu.org>
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
# define __CDIO_CONFIG_H__ 1
#endif
#include <cdio/sector.h>
#include <cdio/util.h>
#include <cdio/logging.h>
#include "cdio_assert.h"
#include "portable.h"
#ifdef HAVE_STDIO_H
#include <stdio.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <ctype.h>
static const char _rcsid[] = "$Id: sector.c,v 1.5 2005/02/06 04:20:25 rocky Exp $";
/*! String of bytes used to identify the beginning of a Mode 1 or
Mode 2 sector. */
const uint8_t CDIO_SECTOR_SYNC_HEADER[CDIO_CD_SYNC_SIZE] =
{0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0};
/* Variables to hold debugger-helping enumerations */
enum cdio_cd_enums;
enum m2_sector_enums;
lba_t
cdio_lba_to_lsn (lba_t lba)
{
if (CDIO_INVALID_LBA == lba) return CDIO_INVALID_LSN;
return lba - CDIO_PREGAP_SECTORS;
}
/*
The below is adapted from cdparanoia code which claims it is
straight from the MMC3 spec.
*/
void
cdio_lsn_to_msf (lsn_t lsn, msf_t *msf)
{
int m, s, f;
cdio_assert (msf != 0);
if ( lsn >= -CDIO_PREGAP_SECTORS ){
m = (lsn + CDIO_PREGAP_SECTORS) / CDIO_CD_FRAMES_PER_MIN;
lsn -= m * CDIO_CD_FRAMES_PER_MIN;
s = (lsn + CDIO_PREGAP_SECTORS) / CDIO_CD_FRAMES_PER_SEC;
lsn -= s * CDIO_CD_FRAMES_PER_SEC;
f = lsn + CDIO_PREGAP_SECTORS;
} else {
m = (lsn + CDIO_CD_MAX_LSN) / CDIO_CD_FRAMES_PER_MIN;
lsn -= m * (CDIO_CD_FRAMES_PER_MIN);
s = (lsn+CDIO_CD_MAX_LSN) / CDIO_CD_FRAMES_PER_SEC;
lsn -= s * CDIO_CD_FRAMES_PER_SEC;
f = lsn + CDIO_CD_MAX_LSN;
}
if (m > 99) {
cdio_warn ("number of minutes (%d) truncated to 99.", m);
m = 99;
}
msf->m = cdio_to_bcd8 (m);
msf->s = cdio_to_bcd8 (s);
msf->f = cdio_to_bcd8 (f);
}
/*!
Convert an LBA into a string representation of the MSF.
\warning cdio_lba_to_msf_str returns new allocated string */
char *
cdio_lba_to_msf_str (lba_t lba)
{
if (CDIO_INVALID_LBA == lba) {
return strdup("*INVALID");
} else {
msf_t msf;
msf.m = msf.s = msf.f = 0;
cdio_lba_to_msf (lba, &msf);
return cdio_msf_to_str(&msf);
}
}
/*!
Convert an LSN into the corresponding LBA.
CDIO_INVALID_LBA is returned if there is an error.
*/
lba_t
cdio_lsn_to_lba (lsn_t lsn)
{
if (CDIO_INVALID_LSN == lsn) return CDIO_INVALID_LBA;
return lsn + CDIO_PREGAP_SECTORS;
}
/*!
Convert an LBA into the corresponding MSF.
*/
void
cdio_lba_to_msf (lba_t lba, msf_t *msf)
{
cdio_assert (msf != 0);
cdio_lsn_to_msf(cdio_lba_to_lsn(lba), msf);
}
/*!
Convert a MSF into the corresponding LBA.
CDIO_INVALID_LBA is returned if there is an error.
*/
lba_t
cdio_msf_to_lba (const msf_t *msf)
{
uint32_t lba = 0;
cdio_assert (msf != 0);
lba = cdio_from_bcd8 (msf->m);
lba *= CDIO_CD_SECS_PER_MIN;
lba += cdio_from_bcd8 (msf->s);
lba *= CDIO_CD_FRAMES_PER_SEC;
lba += cdio_from_bcd8 (msf->f);
return lba;
}
/*!
Convert a MSF into the corresponding LSN.
CDIO_INVALID_LSN is returned if there is an error.
*/
lba_t
cdio_msf_to_lsn (const msf_t *msf)
{
return cdio_lba_to_lsn(cdio_msf_to_lba (msf));
}
/*!
Convert an LBA into a string representation of the MSF.
\warning cdio_lba_to_msf_str returns new allocated string */
char *
cdio_msf_to_str (const msf_t *msf)
{
char buf[16];
snprintf (buf, sizeof (buf), "%2.2x:%2.2x:%2.2x", msf->m, msf->s, msf->f);
return strdup (buf);
}
/*!
Convert a MSF - broken out as 3 integer components into the
corresponding LBA.
CDIO_INVALID_LBA is returned if there is an error.
*/
lba_t
cdio_msf3_to_lba (unsigned int minutes, unsigned int seconds,
unsigned int frames)
{
return ((minutes * CDIO_CD_SECS_PER_MIN + seconds) * CDIO_CD_FRAMES_PER_SEC
+ frames);
}
/*!
Convert a string of the form MM:SS:FF into the corresponding LBA.
CDIO_INVALID_LBA is returned if there is an error.
*/
lba_t
cdio_mmssff_to_lba (const char *psz_mmssff)
{
int psz_field;
lba_t ret;
2012-11-04 01:33:54 +00:00
unsigned char c;
if (0 == strcmp (psz_mmssff, "0"))
return 0;
c = *psz_mmssff++;
if(c >= '0' && c <= '9')
psz_field = (c - '0');
else
return CDIO_INVALID_LBA;
while(':' != (c = *psz_mmssff++)) {
if(c >= '0' && c <= '9')
psz_field = psz_field * 10 + (c - '0');
else
return CDIO_INVALID_LBA;
}
ret = cdio_msf3_to_lba (psz_field, 0, 0);
c = *psz_mmssff++;
if(c >= '0' && c <= '9')
psz_field = (c - '0');
else
return CDIO_INVALID_LBA;
if(':' != (c = *psz_mmssff++)) {
if(c >= '0' && c <= '9') {
psz_field = psz_field * 10 + (c - '0');
c = *psz_mmssff++;
if(c != ':')
return CDIO_INVALID_LBA;
}
else
return CDIO_INVALID_LBA;
}
if(psz_field >= CDIO_CD_SECS_PER_MIN)
return CDIO_INVALID_LBA;
ret += cdio_msf3_to_lba (0, psz_field, 0);
c = *psz_mmssff++;
if (isdigit(c))
psz_field = (c - '0');
else
return -1;
if('\0' != (c = *psz_mmssff++)) {
if (isdigit(c)) {
psz_field = psz_field * 10 + (c - '0');
c = *psz_mmssff++;
}
else
return CDIO_INVALID_LBA;
}
if('\0' != c)
return CDIO_INVALID_LBA;
if(psz_field >= CDIO_CD_FRAMES_PER_SEC)
return CDIO_INVALID_LBA;
ret += psz_field;
return ret;
}
/*
* Local variables:
* c-file-style: "gnu"
* tab-width: 8
* indent-tabs-mode: nil
* End:
*/