diff options
Diffstat (limited to 'contrib/syslinux-4.02/memdump/ymsend.c')
| -rw-r--r-- | contrib/syslinux-4.02/memdump/ymsend.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/memdump/ymsend.c b/contrib/syslinux-4.02/memdump/ymsend.c new file mode 100644 index 0000000..9d89294 --- /dev/null +++ b/contrib/syslinux-4.02/memdump/ymsend.c @@ -0,0 +1,167 @@ +/* + * Ymodem send routine. Only supports 1K blocks and CRC mode. + */ + +#include <string.h> +#include <stdio.h> +#include "ymsend.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_blk(struct serial_if *sif, const void *data, size_t bytes) +{ + uint8_t ack_buf; + + if (bytes) + sif->write(sif, data, bytes); + + do { + do { + sif->read(sif, &ack_buf, 1); + } while (ack_buf != ACK && ack_buf != NAK); + } while (ack_buf == NAK); +} + +static const uint8_t eot_buf = EOT; + +void send_ymodem(struct serial_if *sif, struct file_info *fileinfo, + void (*gen_data) (void *, size_t, struct file_info *, size_t)) +{ + uint8_t ack_buf, blk_buf[1024 + 5], *np, *q; + const char *p; + size_t len, lx, pos; + int blk; + + /* Wait for initial handshake */ + printf("Waiting for handshake...\n"); + do { + sif->read(sif, &ack_buf, 1); + } while (ack_buf != 'C'); + + /* Send initial batch header (filename, length etc.) */ + q = blk_buf + 3; + p = fileinfo->name; + while (*p) + *q++ = *p++; + *q++ = '\0'; + + lx = len = fileinfo->size; + do { + q++; + lx /= 10; + } while (lx); + + np = q; + lx = len; + do { + *--np = (lx % 10) + '0'; + lx /= 10; + } while (lx); + + while (q < blk_buf + 1024 + 3) + *q++ = 0; + + blk = 0; + pos = 0; + do { + if (blk != 0) { + gen_data(blk_buf + 3, 1024, fileinfo, pos); + pos += 1024; + len = (len < 1024) ? 0 : len - 1024; + } + + blk_buf[0] = STX; + blk_buf[1] = blk; + blk_buf[2] = ~blk; + add_crc16(blk_buf + 3, 1024); + + printf("Sending block %d...\r", blk); + send_ack_blk(sif, blk_buf, 1024 + 5); + + blk++; + } while (len); + + printf("\nSending EOT...\n"); + send_ack_blk(sif, &eot_buf, 1); + printf("Done.\n"); +} + +void end_ymodem(struct serial_if *sif) +{ + uint8_t ack_buf; + uint8_t blk_buf[128 + 5]; + + /* Wait for initial handshake */ + printf("END: Waiting for handshake...\n"); + do { + sif->read(sif, &ack_buf, 1); + } while (ack_buf != 'C'); + + memset(blk_buf, 0, sizeof blk_buf); + blk_buf[0] = SOH; + blk_buf[1] = 0; + blk_buf[2] = 0xff; + add_crc16(blk_buf + 3, 128); + printf("Sending block 0...\n"); + send_ack_blk(sif, &blk_buf, 128 + 5); + + printf("Sending EOT...\n"); + sif->write(sif, &eot_buf, 1); + /* rb doesn't ack the EOT for an end batch transfer. */ + printf("Done.\n"); +} |