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/*
* PSX-Tools Bundle Pack
* Copyright (C) 1998 Heiko Eissfeldt
* portions used& Chris Smith
* Modified by Yazoo, then by
* Nicolas "Pixel" Noble
*
* 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
*/
/* $Id: yazedc.cpp,v 1.5 2004-11-27 21:47:56 pixel Exp $ */
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "yazedc.h"
yazedc::yazedc() : minute(0), second(2), frame(0), sectortype(0) {}
/* ------------- tables generated by gen_encodes --------------*/
#include "crctables"
static int encode_L2_Q(unsigned char inout[4 + L2_RAW + 4 + 8 + L2_P + L2_Q])
{
unsigned char *Q;
int i,j;
Q = inout + 4 + L2_RAW + 4 + 8 + L2_P;
memset(Q, 0, L2_Q);
for (j = 0; j < 26; j++) {
for (i = 0; i < 43; i++) {
unsigned char data;
/* LSB */
data = inout[(j*43*2+i*2*44) % (4 + L2_RAW + 4 + 8 + L2_P)];
if (data != 0) {
unsigned int base = rs_l12_log[data];
unsigned int sum = base + DQ[0][i];
if (sum >= ((1 << RS_L12_BITS)-1))
sum -= (1 << RS_L12_BITS)-1;
Q[0] ^= rs_l12_alog[sum];
sum = base + DQ[1][i];
if (sum >= ((1 << RS_L12_BITS)-1))
sum -= (1 << RS_L12_BITS)-1;
Q[26*2] ^= rs_l12_alog[sum];
}
/* MSB */
data = inout[(j*43*2+i*2*44+1) % (4 + L2_RAW + 4 + 8 + L2_P)];
if (data != 0) {
unsigned int base = rs_l12_log[data];
unsigned int sum = base+DQ[0][i];
if (sum >= ((1 << RS_L12_BITS)-1))
sum -= (1 << RS_L12_BITS)-1;
Q[1] ^= rs_l12_alog[sum];
sum = base + DQ[1][i];
if (sum >= ((1 << RS_L12_BITS)-1))
sum -= (1 << RS_L12_BITS)-1;
Q[26*2+1] ^= rs_l12_alog[sum];
}
}
Q += 2;
}
return 0;
}
static int encode_L2_P(unsigned char inout[4 + L2_RAW + 4 + 8 + L2_P])
{
unsigned char *P;
int i,j;
P = inout + 4 + L2_RAW + 4 + 8;
memset(P, 0, L2_P);
for (j = 0; j < 43; j++) {
for (i = 0; i < 24; i++) {
unsigned char data;
/* LSB */
data = inout[i*2*43];
if (data != 0) {
unsigned int base = rs_l12_log[data];
unsigned int sum = base + DP[0][i];
if (sum >= ((1 << RS_L12_BITS)-1))
sum -= (1 << RS_L12_BITS)-1;
P[0] ^= rs_l12_alog[sum];
sum = base + DP[1][i];
if (sum >= ((1 << RS_L12_BITS)-1))
sum -= (1 << RS_L12_BITS)-1;
P[43*2] ^= rs_l12_alog[sum];
}
/* MSB */
data = inout[i*2*43+1];
if (data != 0) {
unsigned int base = rs_l12_log[data];
unsigned int sum = base + DP[0][i];
if (sum >= ((1 << RS_L12_BITS)-1))
sum -= (1 << RS_L12_BITS)-1;
P[1] ^= rs_l12_alog[sum];
sum = base + DP[1][i];
if (sum >= ((1 << RS_L12_BITS)-1))
sum -= (1 << RS_L12_BITS)-1;
P[43*2+1] ^= rs_l12_alog[sum];
}
}
P += 2;
inout += 2;
}
return 0;
}
int yazedc::scramble_L2(unsigned char *inout)
{
unsigned char *r = inout + 12;
const unsigned char *s = yellowbook_scrambler;
unsigned int i;
unsigned int *f = (unsigned int *)inout;
for (i = (L2_RAW + L2_Q + L2_P +16)/sizeof(unsigned char); i; i--) {
*r++ ^= *s++;
}
/* generate F1 frames */
for (i = (2352/sizeof(unsigned int)); i; i--) {
*f++ = ((*f & 0xff00ff00UL) >> 8) | ((*f & 0x00ff00ffUL) << 8);
}
return 0;
}
int yazedc::build_address(unsigned char inout[], int sectortype, unsigned address)
{
inout[12] = minute;
inout[13] = second;
inout[14] = frame;
if (sectortype == MODE_0)
inout[15] = 0;
else if (sectortype == MODE_1)
inout[15] = 1;
else if (sectortype == MODE_2)
inout[15] = 2;
else if (sectortype == MODE_2_FORM_1)
inout[15] = 2;
else if (sectortype == MODE_2_FORM_2)
inout[15] = 2;
else
return -1;
return 0;
}
#include "crctable.out"
unsigned long int build_edc(unsigned char inout[], int from, int upto)
{
unsigned char *p = inout+from;
unsigned long result = 0;
for (; from <= upto; from++)
result = EDC_crctable[(result ^ *p++) & 0xffL] ^ (result >> 8);
return result;
}
/* Layer 2 Product code en/decoder */
int yazedc::do_encode_L2(unsigned char inout[(12 + 4 + L2_RAW+4+8+L2_Q+L2_P)], int sectortype, unsigned address)
{
unsigned long int result;
#define SYNCPATTERN "\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
/* supply initial sync pattern */
memcpy(inout, SYNCPATTERN, sizeof(SYNCPATTERN));
if (sectortype == MODE_0) {
memset(inout + sizeof(SYNCPATTERN), 0, 4 + L2_RAW + 12 + L2_P + L2_Q);
build_address(inout, sectortype, address);
return 0;
}
switch (sectortype) {
case MODE_1:
build_address(inout, sectortype, address);
result = build_edc(inout, 0, 16+2048-1);
inout[2064+0] = result >> 0L;
inout[2064+1] = result >> 8L;
inout[2064+2] = result >> 16L;
inout[2064+3] = result >> 24L;
memset(inout+2064+4, 0, 8);
encode_L2_P(inout+12);
encode_L2_Q(inout+12);
break;
case MODE_2:
build_address(inout, sectortype, address);
break;
case MODE_2_FORM_1:
result = build_edc(inout, 16, 16+8+2048-1);
inout[2072+0] = result >> 0L;
inout[2072+1] = result >> 8L;
inout[2072+2] = result >> 16L;
inout[2072+3] = result >> 24L;
/* clear header for P/Q parity calculation */
inout[12] = 0;
inout[12+1] = 0;
inout[12+2] = 0;
inout[12+3] = 0;
encode_L2_P(inout+12);
encode_L2_Q(inout+12);
build_address(inout, sectortype, address);
break;
case MODE_2_FORM_2:
build_address(inout, sectortype, address);
result = build_edc(inout, 16, 16+8+2324-1);
inout[2348+0] = result >> 0L;
inout[2348+1] = result >> 8L;
inout[2348+2] = result >> 16L;
inout[2348+3] = result >> 24L;
break;
default:
return -1;
}
return 0;
}
int yazedc::get_sector_type(void)
{
return sectortype;
}
int yazedc::set_sector_type(int st)
{
switch(st) {
case MODE_0:
case MODE_1:
case MODE_2:
case MODE_2_FORM_1:
case MODE_2_FORM_2:
sectortype = st;
default:
return -1;
}
return 0;
}
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