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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
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define RS_L12_BITS 8
+
+/* audio sector definitions for CIRC */
+#define FRAMES_PER_SECTOR 98
+/* user data bytes per frame */
+#define L1_RAW 24
+/* parity bytes with 8 bit */
+#define L1_Q 4
+#define L1_P 4
+
+/* audio sector Cross Interleaved Reed-Solomon Code (CIRC) encoder (layer 1) */
+/* adds P- and Q- parity information to audio (f2) frames. Also
+ optionally handles the various delays and permutations. The output with all
+ stages enabled can be fed into the Eight-Fourteen-Modulator.
+ On input: 2352 bytes of audio data is given.
+ On output: 3136 bytes of CIRC enriched audio data are returned.
+ */
+int do_encode_L1(unsigned char in[L1_RAW*FRAMES_PER_SECTOR],
+ unsigned char out[(L1_RAW+L1_Q+L1_P)*FRAMES_PER_SECTOR],
+ int delay1, int delay2, int delay3, int scramble);
+
+/* data sector definitions for RSPC */
+/* user data bytes per frame */
+#define L2_RAW (1024*2)
+/* parity bytes for 16 bit units */
+#define L2_Q (26*2*2)
+#define L2_P (43*2*2)
+
+/* known sector types */
+#define MODE_0 0
+#define MODE_1 1
+#define MODE_2 2
+#define MODE_2_FORM_1 3
+#define MODE_2_FORM_2 4
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* set one of the MODE_* constants for subsequent data sector formatting */
+int set_sector_type(int st);
+/* get the current sector type setting for data sector formatting */
+int get_sector_type(void);
+
+/* data sector layer 2 Reed-Solomon Product Code encoder */
+/* encode the given data portion depending on sector type (see
+ get/set_sector_type() functions). Use the given address for the header.
+ The returned data is __unscrambled__ and not in F2-frame format (for that
+ see function scramble_L2()).
+ Supported sector types:
+ MODE_0: a 12-byte sync field, a header and 2336 zeros are returned.
+ MODE_1: the user data portion (2048 bytes) has to be given
+ at offset 16 in the inout array.
+ Sync-, header-, edc-, spare-, p- and q- fields will be added.
+ MODE_2: the user data portion (2336 bytes) has to be given
+ at offset 16 in the inout array.
+ Sync- and header- fields will be added.
+ MODE_2_FORM_1: the user data portion (8 bytes subheader followed
+ by 2048 bytes data) has to be given at offset 16
+ in the inout array.
+ Sync-, header-, edc-, p- and q- fields will be added.
+ MODE_2_FORM_2: the user data portion (8 bytes subheader followed
+ by 2324 bytes data) has to be given at offset 16
+ in the inout array.
+ Sync-, header- and edc- fields will be added.
+*/
+int do_encode_L2(unsigned char *inout, int sectortype, unsigned address);
+int decode_L2_Q(unsigned char inout[4 + L2_RAW + 12 + L2_Q]);
+int decode_L2_P(unsigned char inout[4 + L2_RAW + 12 + L2_Q + L2_P]);
+unsigned long int build_edc(unsigned char inout[], int from, int upto);
+
+/* generates f2 frames from otherwise fully formatted sectors (generated by
+ do_encode_L2()). */
+int scramble_L2(unsigned char *inout);
+
+#ifdef __cplusplus
+}
+#endif
+
+/* r-w sub channel definitions */
+#define RS_SUB_RW_BITS 6
+
+#define PACKETS_PER_SUBCHANNELFRAME 4
+#define LSUB_RAW 18
+#define LSUB_QRAW 2
+/* 6 bit */
+#define LSUB_Q 2
+#define LSUB_P 4
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* R-W subchannel encoder */
+/* On input: 72 bytes packed user data, four frames with each 18 bytes.
+ On output: per frame: 2 bytes user data, 2 bytes Q parity,
+ 16 bytes user data, 4 bytes P parity.
+ Options:
+ delay1: use low level delay line
+ scramble: perform low level permutations
+ */
+int do_encode_sub(unsigned char in[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME],
+ unsigned char out[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME],
+ int delay1, int scramble);
+int do_decode_sub(unsigned char in[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME],
+ unsigned char out[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME],
+ int delay1, int scramble);
+
+int decode_LSUB_Q(unsigned char inout[LSUB_QRAW + LSUB_Q]);
+int decode_LSUB_P(unsigned char inout[LSUB_RAW + LSUB_Q + LSUB_P]);
+
+#ifdef __cplusplus
+}
+#endif
+
+unsigned char minute, second, frame;
+
+/* these prototypes will become public when the function are implemented */
+#ifdef MAIN
+static int do_decode_L2(unsigned char in[(L2_RAW+L2_Q+L2_P)],
+ unsigned char out[L2_RAW]);
+static int do_decode_L1(unsigned char in[(L1_RAW+L1_Q+L1_P)*FRAMES_PER_SECTOR],
+ unsigned char out[L1_RAW*FRAMES_PER_SECTOR],
+ int delay1, int delay2, int delay3, int scramble);
+#endif
+
+/* ------------- tables generated by gen_encodes --------------*/
+
+#include "crctables"
+
+static int encode_L1_Q(unsigned char inout[L1_RAW + L1_Q])
+{
+ unsigned char *Q;
+ int i;
+
+ memmove(inout+L1_RAW/2+L1_Q, inout+L1_RAW/2, L1_RAW/2);
+ Q = inout + L1_RAW/2;
+
+ memset(Q, 0, L1_Q);
+ for (i = 0; i < L1_RAW + L1_Q; i++) {
+ unsigned char data;
+
+ if (i == L1_RAW/2) i += L1_Q;
+ data = inout[i];
+ if (data != 0) {
+ unsigned char base = rs_l12_log[data];
+
+ Q[0] ^= rs_l12_alog[(base+AQ[0][i]) % ((1 << RS_L12_BITS)-1)];
+ Q[1] ^= rs_l12_alog[(base+AQ[1][i]) % ((1 << RS_L12_BITS)-1)];
+ Q[2] ^= rs_l12_alog[(base+AQ[2][i]) % ((1 << RS_L12_BITS)-1)];
+ Q[3] ^= rs_l12_alog[(base+AQ[3][i]) % ((1 << RS_L12_BITS)-1)];
+ }
+ }
+
+ return 0;
+}
+static int encode_L1_P(unsigned char inout[L1_RAW + L1_Q + L1_P])
+{
+ unsigned char *P;
+ int i;
+
+ P = inout + L1_RAW + L1_Q;
+
+ memset(P, 0, L1_P);
+ for (i = 0; i < L2_RAW + L2_Q + L2_P; i++) {
+ unsigned char data;
+
+ data = inout[i];
+ if (data != 0) {
+ unsigned char base = rs_l12_log[data];
+
+ P[0] ^= rs_l12_alog[(base+AP[0][i]) % ((1 << RS_L12_BITS)-1)];
+ P[1] ^= rs_l12_alog[(base+AP[1][i]) % ((1 << RS_L12_BITS)-1)];
+ P[2] ^= rs_l12_alog[(base+AP[2][i]) % ((1 << RS_L12_BITS)-1)];
+ P[3] ^= rs_l12_alog[(base+AP[3][i]) % ((1 << RS_L12_BITS)-1)];
+ }
+ }
+ return 0;
+}
+
+#ifdef MAIN
+static int decode_L1_Q(unsigned char inout[L1_RAW + L1_Q])
+{
+ return 0;
+}
+
+static int decode_L1_P(unsigned char in[L1_RAW + L1_Q + L1_P])
+{
+ return 0;
+}
+#endif
+
+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 decode_L2_Q(unsigned char inout[4 + L2_RAW + 12 + L2_Q])
+{
+ return 0;
+}
+int decode_L2_P(unsigned char inout[4 + L2_RAW + 12 + L2_Q + L2_P])
+{
+ return 0;
+}
+
+int scramble_L2(unsigned char *inout)
+{
+ unsigned char *r = inout + 12;
+ 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;
+}
+
+static int encode_LSUB_Q(unsigned char inout[LSUB_RAW + LSUB_Q])
+{
+ unsigned char *Q;
+/* unsigned char data; */
+ int i;
+
+ memmove(inout+LSUB_QRAW+LSUB_Q, inout+LSUB_QRAW, LSUB_RAW-LSUB_QRAW);
+ Q = inout + LSUB_QRAW;
+
+ memset(Q, 0, LSUB_Q);
+
+#if 0
+ data = inout[0] & 0x3f;
+ if (data != 0) {
+ unsigned char base = rs_sub_rw_log[data];
+
+ Q[0] ^= rs_sub_rw_alog[(base+26) % ((1 << RS_SUB_RW_BITS)-1)];
+ Q[1] ^= rs_sub_rw_alog[(base+7) % ((1 << RS_SUB_RW_BITS)-1)];
+ }
+ data = inout[1] & 0x3f;
+ if (data != 0) {
+ unsigned char base = rs_sub_rw_log[data];
+
+ Q[0] ^= rs_sub_rw_alog[(base+6) % ((1 << RS_SUB_RW_BITS)-1)];
+ Q[1] ^= rs_sub_rw_alog[(base+1) % ((1 << RS_SUB_RW_BITS)-1)];
+ }
+#else
+ for (i = 0; i < LSUB_QRAW; i++) {
+ unsigned char data;
+
+ data = inout[i] & 0x3f;
+ if (data != 0) {
+ unsigned char base = rs_sub_rw_log[data];
+
+ Q[0] ^= rs_sub_rw_alog[(base+SQ[0][i]) % ((1 << RS_SUB_RW_BITS)-1)];
+ Q[1] ^= rs_sub_rw_alog[(base+SQ[1][i]) % ((1 << RS_SUB_RW_BITS)-1)];
+ }
+ }
+#endif
+ return 0;
+}
+
+
+static int encode_LSUB_P(unsigned char inout[LSUB_RAW + LSUB_Q + LSUB_P])
+{
+ unsigned char *P;
+ int i;
+
+ P = inout + LSUB_RAW + LSUB_Q;
+
+ memset(P, 0, LSUB_P);
+ for (i = 0; i < LSUB_RAW + LSUB_Q; i++) {
+ unsigned char data;
+
+ data = inout[i] & 0x3f;
+ if (data != 0) {
+ unsigned char base = rs_sub_rw_log[data];
+
+ P[0] ^= rs_sub_rw_alog[(base+SP[0][i]) % ((1 << RS_SUB_RW_BITS)-1)];
+ P[1] ^= rs_sub_rw_alog[(base+SP[1][i]) % ((1 << RS_SUB_RW_BITS)-1)];
+ P[2] ^= rs_sub_rw_alog[(base+SP[2][i]) % ((1 << RS_SUB_RW_BITS)-1)];
+ P[3] ^= rs_sub_rw_alog[(base+SP[3][i]) % ((1 << RS_SUB_RW_BITS)-1)];
+ }
+ }
+ return 0;
+}
+
+int decode_LSUB_Q(unsigned char inout[LSUB_QRAW + LSUB_Q])
+{
+ unsigned char Q[LSUB_Q];
+ int i;
+
+ memset(Q, 0, LSUB_Q);
+ for (i = LSUB_QRAW + LSUB_Q -1; i>=0; i--) {
+ unsigned char data;
+
+ data = inout[LSUB_QRAW + LSUB_Q -1 -i] & 0x3f;
+ if (data != 0) {
+ unsigned char base = rs_sub_rw_log[data];
+
+ Q[0] ^= rs_sub_rw_alog[(base+0*i) % ((1 << RS_SUB_RW_BITS)-1)];
+ Q[1] ^= rs_sub_rw_alog[(base+1*i) % ((1 << RS_SUB_RW_BITS)-1)];
+ }
+ }
+
+ return (Q[0] != 0 || Q[1] != 0);
+}
+int decode_LSUB_P(unsigned char inout[LSUB_RAW + LSUB_Q + LSUB_P])
+{
+ unsigned char P[LSUB_P];
+ int i;
+
+ memset(P, 0, LSUB_P);
+ for (i = LSUB_RAW + LSUB_Q + LSUB_P-1; i>=0; i--) {
+ unsigned char data;
+
+ data = inout[LSUB_RAW + LSUB_Q + LSUB_P -1 -i] & 0x3f;
+ if (data != 0) {
+ unsigned char base = rs_sub_rw_log[data];
+
+ P[0] ^= rs_sub_rw_alog[(base+0*i) % ((1 << RS_SUB_RW_BITS)-1)];
+ P[1] ^= rs_sub_rw_alog[(base+1*i) % ((1 << RS_SUB_RW_BITS)-1)];
+ P[2] ^= rs_sub_rw_alog[(base+2*i) % ((1 << RS_SUB_RW_BITS)-1)];
+ P[3] ^= rs_sub_rw_alog[(base+3*i) % ((1 << RS_SUB_RW_BITS)-1)];
+ }
+ }
+
+ return (P[0] != 0 || P[1] != 0 || P[2] != 0 || P[3] != 0);
+}
+
+/* Layer 1 CIRC en/decoder */
+#define MAX_L1_DEL1 2
+static unsigned char l1_delay_line1[MAX_L1_DEL1][L1_RAW];
+#define MAX_L1_DEL2 108
+static unsigned char l1_delay_line2[MAX_L1_DEL2][L1_RAW+L1_Q];
+#define MAX_L1_DEL3 1
+static unsigned char l1_delay_line3[MAX_L1_DEL3][L1_RAW+L1_Q+L1_P];
+static unsigned l1_del_index;
+
+int do_encode_L1(unsigned char in[L1_RAW*FRAMES_PER_SECTOR],
+ unsigned char out[(L1_RAW+L1_Q+L1_P)*FRAMES_PER_SECTOR],
+ int delay1, int delay2, int delay3, int permute)
+{
+ int i;
+
+ for (i = 0; i < FRAMES_PER_SECTOR; i++) {
+ int j;
+ unsigned char t;
+
+ if (in != out)
+ memcpy(out, in, L1_RAW);
+
+ if (delay1) {
+ /* shift through delay line 1 */
+ for (j = 0; j < L1_RAW; j++) {
+ if (((j/4) % MAX_L1_DEL1) == 0) {
+ t = l1_delay_line1[l1_del_index % (MAX_L1_DEL1)][j];
+ l1_delay_line1[l1_del_index % (MAX_L1_DEL1)][j] = out[j];
+ out[j] = t;
+ }
+ }
+ }
+
+ if (permute) {
+ /* permute */
+ t = out[2]; out[2] = out[8]; out[8] = out[10]; out[10] = out[18];
+ out[18] = out[6]; out [6] = t;
+ t = out[3]; out[3] = out[9]; out[9] = out[11]; out[11] = out[19];
+ out[19] = out[7]; out [7] = t;
+ t = out[4]; out[4] = out[16]; out[16] = out[20]; out[20] = out[14];
+ out[14] = out[12]; out [12] = t;
+ t = out[5]; out[5] = out[17]; out[17] = out[21]; out[21] = out[15];
+ out[15] = out[13]; out [13] = t;
+ }
+
+ /* build Q parity */
+ encode_L1_Q(out);
+
+ if (delay2) {
+ /* shift through delay line 2 */
+ for (j = 0; j < L1_RAW+L1_Q; j++) {
+ if (j != 0) {
+ t = l1_delay_line2[(l1_del_index) % MAX_L1_DEL2][j];
+ l1_delay_line2[(l1_del_index + j*4) % MAX_L1_DEL2][j] = out[j];
+ out[j] = t;
+ }
+ }
+ }
+
+ /* build P parity */
+ encode_L1_P(out);
+
+ if (delay3) {
+ /* shift through delay line 3 */
+ for (j = 0; j < L1_RAW+L1_Q+L1_P; j++) {
+ if (((j) & MAX_L1_DEL3) == 0) {
+ t = l1_delay_line3[0][j];
+ l1_delay_line3[0][j] = out[j];
+ out[j] = t;
+ }
+ }
+ }
+
+ /* invert Q and P parity */
+ for (j = 0; j < L1_Q; j++)
+ out[j+12] = ~out[j+12];
+ for (j = 0; j < L1_P; j++)
+ out[j+28] = ~out[j+28];
+
+ l1_del_index++;
+ out += L1_RAW+L1_Q+L1_P;
+ in += L1_RAW;
+ }
+ return 0;
+}
+
+#ifdef MAIN
+int do_decode_L1(unsigned char in[(L1_RAW+L1_Q+L1_P)*FRAMES_PER_SECTOR],
+ unsigned char out[L1_RAW*FRAMES_PER_SECTOR],
+ int delay1, int delay2, int delay3, int permute)
+{
+ int i;
+
+ for (i = 0; i < FRAMES_PER_SECTOR; i++) {
+ int j;
+ unsigned char t;
+
+ if (delay3) {
+ /* shift through delay line 3 */
+ for (j = 0; j < L1_RAW+L1_Q+L1_P; j++) {
+ if (((j) & MAX_L1_DEL3) != 0) {
+ t = l1_delay_line3[0][j];
+ l1_delay_line3[0][j] = in[j];
+ in[j] = t;
+ }
+ }
+ }
+
+ /* invert Q and P parity */
+ for (j = 0; j < L1_Q; j++)
+ in[j+12] = ~in[j+12];
+ for (j = 0; j < L1_P; j++)
+ in[j+28] = ~in[j+28];
+
+ /* build P parity */
+ decode_L1_P(in);
+
+ if (delay2) {
+ /* shift through delay line 2 */
+ for (j = 0; j < L1_RAW+L1_Q; j++) {
+ if (j != L1_RAW+L1_Q-1) {
+ t = l1_delay_line2[(l1_del_index) % MAX_L1_DEL2][j];
+ l1_delay_line2[(l1_del_index + (MAX_L1_DEL2 - j*4)) % MAX_L1_DEL2][j] = in[j];
+ in[j] = t;
+ }
+ }
+ }
+
+ /* build Q parity */
+ decode_L1_Q(in);
+
+ if (permute) {
+ /* permute */
+ t = in[2]; in[2] = in[6]; in[6] = in[18]; in[18] = in[10];
+ in[10] = in[8]; in [8] = t;
+ t = in[3]; in[3] = in[7]; in[7] = in[19]; in[19] = in[11];
+ in[11] = in[9]; in [9] = t;
+ t = in[4]; in[4] = in[12]; in[12] = in[14]; in[14] = in[20];
+ in[20] = in[16]; in [16] = t;
+ t = in[5]; in[5] = in[13]; in[13] = in[15]; in[15] = in[21];
+ in[21] = in[17]; in [17] = t;
+ }
+
+ if (delay1) {
+ /* shift through delay line 1 */
+ for (j = 0; j < L1_RAW; j++) {
+ if (((j/4) % MAX_L1_DEL1) != 0) {
+ t = l1_delay_line1[l1_del_index % (MAX_L1_DEL1)][j];
+ l1_delay_line1[l1_del_index % (MAX_L1_DEL1)][j] = in[j];
+ in[j] = t;
+ }
+ }
+ }
+
+ if (in != out)
+ memcpy(out, in, (L1_RAW));
+
+ l1_del_index++;
+ in += L1_RAW+L1_Q+L1_P;
+ out += L1_RAW;
+ }
+ return 0;
+}
+
+#endif
+
+#if 0
+static unsigned char bin2bcd(unsigned p)
+{
+ return ((p/10)<<4)|(p%10);
+}
+#endif
+
+static int 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 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;
+}
+
+#ifdef MAIN
+static int do_decode_L2(unsigned char in[(L2_RAW+L2_Q+L2_P)],
+ unsigned char out[L2_RAW])
+{
+ return 0;
+}
+#endif
+
+
+#define MAX_SUB_DEL 8
+static unsigned char sub_delay_line[MAX_SUB_DEL][LSUB_RAW+LSUB_Q+LSUB_P];
+static unsigned sub_del_index;
+
+/* R-W Subchannel en/decoder */
+int do_encode_sub(unsigned char in[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME],
+ unsigned char out[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME],
+ int delay1, int permute)
+{
+ int i;
+
+ if (in == out) return -1;
+
+ for (i = 0; i < PACKETS_PER_SUBCHANNELFRAME; i++) {
+ int j;
+ unsigned char t;
+
+ memcpy(out, in, (LSUB_RAW));
+
+ /* build Q parity */
+ encode_LSUB_Q(out);
+
+ /* build P parity */
+ encode_LSUB_P(out);
+
+ if (permute) {
+ /* permute */
+ t = out[1]; out[1] = out[18]; out[18] = t;
+ t = out[2]; out[2] = out[ 5]; out[ 5] = t;
+ t = out[3]; out[3] = out[23]; out[23] = t;
+ }
+
+ if (delay1) {
+ /* shift through delay_line */
+ for (j = 0; j < LSUB_RAW+LSUB_Q+LSUB_P; j++) {
+ if ((j % MAX_SUB_DEL) != 0) {
+ t = sub_delay_line[(sub_del_index) % MAX_SUB_DEL][j];
+ sub_delay_line[(sub_del_index + j) % MAX_SUB_DEL][j] = out[j];
+ out[j] = t;
+ }
+ }
+ }
+ sub_del_index++;
+ out += LSUB_RAW+LSUB_Q+LSUB_P;
+ in += LSUB_RAW;
+ }
+ return 0;
+}
+
+int
+do_decode_sub(
+ unsigned char in[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME],
+ unsigned char out[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME],
+ int delay1, int permute)
+{
+ int i;
+
+ if (in == out) return -1;
+
+ for (i = 0; i < PACKETS_PER_SUBCHANNELFRAME; i++) {
+ int j;
+ unsigned char t;
+
+ if (delay1) {
+ /* shift through delay_line */
+ for (j = 0; j < LSUB_RAW+LSUB_Q+LSUB_P; j++) {
+ if ((j % MAX_SUB_DEL) != MAX_SUB_DEL-1) {
+ t = sub_delay_line[(sub_del_index) % MAX_SUB_DEL][j];
+ sub_delay_line[(sub_del_index + (MAX_SUB_DEL - j)) % MAX_SUB_DEL][j] = in[j];
+ in[j] = t;
+ }
+ }
+ }
+
+ if (permute) {
+ /* permute */
+ t = in[1]; in[1] = in[18]; in[18] = t;
+ t = in[2]; in[2] = in[ 5]; in[ 5] = t;
+ t = in[3]; in[3] = in[23]; in[23] = t;
+ }
+
+ /* build P parity */
+ decode_LSUB_P(in);
+
+ /* build Q parity */
+ decode_LSUB_Q(in);
+
+ memcpy(out, in, LSUB_QRAW);
+ memcpy(out+LSUB_QRAW, in+LSUB_QRAW+LSUB_Q, LSUB_RAW-LSUB_QRAW);
+
+ sub_del_index++;
+ in += LSUB_RAW+LSUB_Q+LSUB_P;
+ out += LSUB_RAW;
+ }
+ return 0;
+}
+
+static int sectortype = MODE_0;
+int get_sector_type(void)
+{
+ return sectortype;
+}
+
+int 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;
+}
+
+/* ------------- --------------*/
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-23 23:25:57 +0000