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/*
$Id: sector.c,v 1.2 2004/04/11 12:20:32 miguelfreitas Exp $
Copyright (C) 2000 Herbert Valerio Riedel <hvr@gnu.org>
(C) 1998 Heiko Eissfeldt <heiko@colossus.escape.de>
portions used & Chris Smith
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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <cdio/cdio.h>
#include <libvcd/types.h>
#include <libvcd/sector.h>
/* Private includes */
#include "vcd_assert.h"
#include "bytesex.h"
#include "salloc.h"
#include "sector_private.h"
static const char _rcsid[] = "$Id: sector.c,v 1.2 2004/04/11 12:20:32 miguelfreitas Exp $";
static const uint8_t sync_pattern[12] = {
0x00, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0x00
};
static void
build_address (void *buf, sectortype_t sectortype, uint32_t address)
{
raw_cd_sector_t *sector = buf;
vcd_assert (sizeof(raw_cd_sector_t) == CDIO_CD_FRAMESIZE_RAW-DATA_LEN);
cdio_lba_to_msf(address, &(sector->msf));
switch(sectortype) {
case MODE_0:
sector->mode = 0;
break;
case MODE_2:
case MODE_2_FORM_1:
case MODE_2_FORM_2:
sector->mode = 2;
break;
default:
vcd_assert_not_reached ();
break;
}
}
/* From cdrtools-1.11a25 */
static uint32_t
build_edc(const uint8_t inout[], int from, int upto)
{
const uint8_t *p = inout+from;
uint32_t result = 0;
upto -= from-1;
upto /= 4;
while (--upto >= 0) {
result = EDC_crctable[(result ^ *p++) & 0xffL] ^ (result >> 8);
result = EDC_crctable[(result ^ *p++) & 0xffL] ^ (result >> 8);
result = EDC_crctable[(result ^ *p++) & 0xffL] ^ (result >> 8);
result = EDC_crctable[(result ^ *p++) & 0xffL] ^ (result >> 8);
}
return (result);
}
/* From cdrtools-1.11a40 */
static void
encode_L2_Q(uint8_t inout[4 + L2_RAW + 4 + 8 + L2_P + L2_Q])
{
uint8_t *dps;
uint8_t *dp;
uint8_t *Q;
int i, j;
Q = inout + 4 + L2_RAW + 4 + 8 + L2_P;
dps = inout;
for (j = 0; j < 26; j++) {
uint16_t a, b;
a = b = 0;
dp = dps;
for (i = 0; i < 43; i++) {
/* LSB */
a ^= L2sq[i][*dp++];
/* MSB */
b ^= L2sq[i][*dp];
dp += 2*44-1;
if (dp >= &inout[(4 + L2_RAW + 4 + 8 + L2_P)]) {
dp -= (4 + L2_RAW + 4 + 8 + L2_P);
}
}
Q[0] = a >> 8;
Q[26*2] = a;
Q[1] = b >> 8;
Q[26*2+1] = b;
Q += 2;
dps += 2*43;
}
}
static void
encode_L2_P (uint8_t inout[4 + L2_RAW + 4 + 8 + L2_P])
{
uint8_t *dp;
unsigned char *P;
int i, j;
P = inout + 4 + L2_RAW + 4 + 8;
for (j = 0; j < 43; j++) {
uint16_t a;
uint16_t b;
a = b = 0;
dp = inout;
for (i = 19; i < 43; i++) {
/* LSB */
a ^= L2sq[i][*dp++];
/* MSB */
b ^= L2sq[i][*dp];
dp += 2*43 -1;
}
P[0] = a >> 8;
P[43*2] = a;
P[1] = b >> 8;
P[43*2+1] = b;
P += 2;
inout += 2;
}
}
/* Layer 2 Product code en/decoder */
static void
do_encode_L2 (void *buf, sectortype_t sectortype, uint32_t address)
{
raw_cd_sector_t *raw_sector = buf;
vcd_assert (buf != NULL);
vcd_assert (sizeof (sync_pattern) == SYNC_LEN);
vcd_assert (sizeof (mode2_form1_sector_t) == CDIO_CD_FRAMESIZE_RAW);
vcd_assert (sizeof (mode2_form2_sector_t) == CDIO_CD_FRAMESIZE_RAW);
vcd_assert (sizeof (mode0_sector_t) == CDIO_CD_FRAMESIZE_RAW);
vcd_assert (sizeof (raw_cd_sector_t) == SYNC_LEN+HEADER_LEN);
memset (raw_sector, 0, SYNC_LEN+HEADER_LEN);
memcpy (raw_sector->sync, sync_pattern, sizeof (sync_pattern));
switch (sectortype) {
case MODE_0:
{
mode0_sector_t *sector = buf;
memset(sector->data, 0, sizeof(sector->data));
}
break;
case MODE_2:
break;
case MODE_2_FORM_1:
{
mode2_form1_sector_t *sector = buf;
sector->edc = uint32_to_le(build_edc(buf, 16, 16+8+2048-1));
encode_L2_P((uint8_t*)buf+SYNC_LEN);
encode_L2_Q((uint8_t*)buf+SYNC_LEN);
}
break;
case MODE_2_FORM_2:
{
mode2_form2_sector_t *sector = buf;
sector->edc = uint32_to_le(build_edc(buf, 16, 16+8+2324-1));
}
break;
default:
vcd_assert_not_reached ();
}
build_address (buf, sectortype, address);
}
void
_vcd_make_mode2 (void *raw_sector, const void *data, uint32_t extent,
uint8_t fnum, uint8_t cnum, uint8_t sm, uint8_t ci)
{
uint8_t *subhdr = (uint8_t*)raw_sector+16;
vcd_assert (raw_sector != NULL);
vcd_assert (data != NULL);
vcd_assert (extent != SECTOR_NIL);
memset (raw_sector, 0, CDIO_CD_FRAMESIZE_RAW);
subhdr[0] = subhdr[4] = fnum;
subhdr[1] = subhdr[5] = cnum;
subhdr[2] = subhdr[6] = sm;
subhdr[3] = subhdr[7] = ci;
if (sm & SM_FORM2)
{
memcpy ((char*)raw_sector+CDIO_CD_XA_SYNC_HEADER, data,
M2F2_SECTOR_SIZE);
do_encode_L2 (raw_sector, MODE_2_FORM_2, extent+CDIO_PREGAP_SECTORS);
}
else
{
memcpy ((char*)raw_sector+CDIO_CD_XA_SYNC_HEADER, data,
CDIO_CD_FRAMESIZE);
do_encode_L2 (raw_sector, MODE_2_FORM_1, extent+CDIO_PREGAP_SECTORS);
}
}
void
_vcd_make_raw_mode2 (void *raw_sector, const void *data, uint32_t extent)
{
vcd_assert (raw_sector != NULL);
vcd_assert (data != NULL);
vcd_assert (extent != SECTOR_NIL);
memset (raw_sector, 0, CDIO_CD_FRAMESIZE_RAW);
memcpy ((char*)raw_sector+12+4, data, M2RAW_SECTOR_SIZE);
do_encode_L2 (raw_sector, MODE_2, extent+CDIO_PREGAP_SECTORS);
}
/*
* Local variables:
* c-file-style: "gnu"
* tab-width: 8
* indent-tabs-mode: nil
* End:
*/
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