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-rw-r--r--com32/sysdump/be_ymodem.c165
1 files changed, 165 insertions, 0 deletions
diff --git a/com32/sysdump/be_ymodem.c b/com32/sysdump/be_ymodem.c
new file mode 100644
index 00000000..632758d9
--- /dev/null
+++ b/com32/sysdump/be_ymodem.c
@@ -0,0 +1,165 @@
+/*
+ * Ymodem send routine. Only supports 1K blocks and CRC mode.
+ */
+
+#include <string.h>
+#include <stdio.h>
+#include <inttypes.h>
+#include "backend.h"
+#include "serial.h"
+
+enum {
+ SOH = 0x01,
+ STX = 0x02,
+ EOT = 0x04,
+ ACK = 0x06,
+ NAK = 0x15,
+ CAN = 0x18,
+};
+
+/*
+ * Append a CRC16 to a block
+ */
+static void add_crc16(uint8_t * blk, int len)
+{
+ static const uint16_t crctab[256] = {
+ 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
+ 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
+ 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
+ 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
+ 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
+ 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
+ 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
+ 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
+ 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
+ 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
+ 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
+ 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
+ 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
+ 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
+ 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
+ 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
+ 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
+ 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
+ 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
+ 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
+ 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
+ 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
+ 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
+ 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
+ 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
+ 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
+ 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
+ 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
+ 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
+ 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
+ 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
+ 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
+ };
+ uint16_t crc = 0;
+
+ while (len--)
+ crc = crctab[(crc >> 8) ^ *blk++] ^ crc << 8;
+
+ *blk++ = crc >> 8;
+ *blk = crc;
+}
+
+static void send_ack(struct backend *be, const uint8_t *blk, size_t bytes);
+
+static void send_ack_blk(struct backend *be, uint8_t *blk)
+{
+ printf("Sending block %u...\r", be->ymodem.seq);
+
+ blk[0] = STX;
+ blk[1] = be->ymodem.seq++;
+ blk[2] = ~blk[1];
+ add_crc16(blk+3, 1024);
+
+ send_ack(be, blk, 1024+5);
+}
+
+static void send_ack(struct backend *be, const uint8_t *blk, size_t bytes)
+{
+ uint8_t ack_buf;
+
+ serial_write(&be->ymodem.serial, blk, bytes);
+
+ do {
+ do {
+ serial_read(&be->ymodem.serial, &ack_buf, 1);
+ } while (ack_buf != ACK && ack_buf != NAK);
+ } while (ack_buf == NAK);
+}
+
+static int be_ymodem_open(struct backend *be, const char *argv[], size_t len)
+{
+ uint8_t ack_buf, blk_buf[1024 + 5];
+
+ be->ymodem.seq = 0;
+
+ /* Initialize serial port */
+ if (serial_init(&be->ymodem.serial, argv+1))
+ return -1;
+
+ /* Wait for initial handshake */
+ printf("Waiting for handshake...\n");
+ do {
+ serial_read(&be->ymodem.serial, &ack_buf, 1);
+ } while (ack_buf != 'C');
+
+ snprintf((char *)blk_buf+3, 1024, "%s%c%zu", argv[0], 0, len);
+ send_ack_blk(be, blk_buf);
+
+ return 0;
+}
+
+static int be_ymodem_write(struct backend *be, const char *buf, size_t len)
+{
+ static const uint8_t eot_buf = EOT;
+ uint8_t ack_buf;
+ uint8_t blk_buf[1024 + 5];
+
+ memcpy(blk_buf+3, buf, len);
+ if (len < 1024)
+ memset(blk_buf+3+1024-len, 0x1a, 1024-len);
+
+ send_ack_blk(be, blk_buf);
+
+ if (len < 1024) {
+ printf("\nSending EOT...\n");
+ send_ack(be, &eot_buf, 1);
+
+ printf("Waiting for handshake...\n");
+ do {
+ serial_read(&be->ymodem.serial, &ack_buf, 1);
+ } while (ack_buf != 'C');
+ be->ymodem.seq = 0;
+
+ printf("Sending batch termination block...\n");
+ memset(blk_buf+3, 0, 128);
+ blk_buf[0] = SOH;
+ blk_buf[1] = 0;
+ blk_buf[2] = 0xff;
+ add_crc16(blk_buf + 3, 128);
+ serial_write(&be->ymodem.serial, blk_buf, 128 + 5);
+ /*
+ * rb doesn't seem to ack the EOT for an end batch transfer,
+ * contrary to spec.
+ */
+ printf("Done.\n");
+ serial_cleanup(&be->ymodem.serial);
+ }
+
+ return 0;
+}
+
+struct backend be_ymodem = {
+ .name = "ymodem",
+ .helpmsg = "filename port [speed]",
+ .minargs = 2,
+ .blocksize = 1024,
+ .flags = BE_NEEDLEN,
+ .open = be_ymodem_open,
+ .write = be_ymodem_write,
+};