1/*
2 * Ymodem send routine.  Only supports 1K blocks and CRC mode.
3 */
4
5#include <string.h>
6#include <stdio.h>
7#include <inttypes.h>
8#include "upload_backend.h"
9#include "serial.h"
10
11enum {
12    SOH = 0x01,
13    STX = 0x02,
14    EOT = 0x04,
15    ACK = 0x06,
16    NAK = 0x15,
17    CAN = 0x18,
18};
19
20struct ymodem_state {
21    struct serial_if serial;
22    unsigned int seq, blocks;
23};
24
25/*
26 * Append a CRC16 to a block
27 */
28static void add_crc16(uint8_t * blk, int len)
29{
30    static const uint16_t crctab[256] = {
31	0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
32	0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
33	0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
34	0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
35	0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
36	0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
37	0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
38	0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
39	0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
40	0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
41	0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
42	0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
43	0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
44	0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
45	0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
46	0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
47	0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
48	0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
49	0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
50	0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
51	0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
52	0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
53	0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
54	0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
55	0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
56	0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
57	0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
58	0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
59	0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
60	0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
61	0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
62	0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
63    };
64    uint16_t crc = 0;
65
66    while (len--)
67	crc = crctab[(crc >> 8) ^ *blk++] ^ crc << 8;
68
69    *blk++ = crc >> 8;
70    *blk = crc;
71}
72
73static void send_ack(struct ymodem_state *ym, const uint8_t *blk,
74		     size_t bytes);
75
76static void send_ack_blk(struct ymodem_state *ym, uint8_t *blk)
77{
78    printf("Sending block %u/%u...\r", ym->seq, ym->blocks);
79
80    blk[0] = STX;
81    blk[1] = ym->seq++;
82    blk[2] = ~blk[1];
83    add_crc16(blk+3, 1024);
84
85    send_ack(ym, blk, 1024+5);
86}
87
88static void send_ack(struct ymodem_state *ym, const uint8_t *blk, size_t bytes)
89{
90    uint8_t ack_buf;
91
92    do {
93	serial_write(&ym->serial, blk, bytes);
94
95	do {
96	    serial_read(&ym->serial, &ack_buf, 1);
97	} while (ack_buf != ACK && ack_buf != NAK);
98    } while (ack_buf == NAK);
99}
100
101static int upload_ymodem_write(struct upload_backend *be)
102{
103    static const uint8_t eot_buf = EOT;
104    uint8_t ack_buf;
105    uint8_t blk_buf[1024 + 5];
106    struct ymodem_state ym;
107    const char *buf;
108    size_t len, chunk;
109    const char ymodem_banner[] = "Now begin Ymodem download...\r\n";
110
111    buf = be->outbuf;
112    len = be->zbytes;
113
114    putchar('\n');
115
116    ym.seq = 0;
117    ym.blocks = (len+1023)/1024;
118
119    /* Initialize serial port */
120    if (serial_init(&ym.serial, &be->argv[1]))
121	return -1;
122
123    /* Write banner */
124    printf("Writing banner...\n");
125    serial_write(&ym.serial, ymodem_banner, sizeof ymodem_banner-1);
126
127    /* Wait for initial handshake */
128    printf("Waiting for handshake...\n");
129    do {
130	serial_read(&ym.serial, &ack_buf, 1);
131    } while (ack_buf != 'C');
132
133    /* Send filename block */
134    memset(blk_buf, 0, sizeof blk_buf);
135    snprintf((char *)blk_buf+3, 1024, "%s%c%zu 0%o 0644",
136	     be->argv[0], 0, be->zbytes, be->now);
137    send_ack_blk(&ym, blk_buf);
138
139    while (len) {
140	chunk = len < 1024 ? len : 1024;
141
142	memcpy(blk_buf+3, buf, chunk);
143	if (chunk < 1024)
144	    memset(blk_buf+3+chunk, 0x1a, 1024-chunk);
145
146	send_ack_blk(&ym, blk_buf);
147	buf += chunk;
148	len -= chunk;
149    }
150
151    printf("\nSending EOT...\n");
152    send_ack(&ym, &eot_buf, 1);
153
154    printf("Waiting for handshake...\n");
155    do {
156	serial_read(&ym.serial, &ack_buf, 1);
157    } while (ack_buf != 'C');
158    ym.seq = 0;
159
160    printf("Sending batch termination block...\n");
161    memset(blk_buf+3, 0, 1024);
162    send_ack_blk(&ym, blk_buf);
163
164    printf("Cleaning up...             \n");
165    serial_cleanup(&ym.serial);
166
167    return 0;
168}
169
170struct upload_backend upload_ymodem = {
171    .name       = "ymodem",
172    .helpmsg    = "filename [port [speed]]",
173    .minargs    = 1,
174    .write      = upload_ymodem_write,
175};
176