common/xyzModem.c

   1 /*
   2  *==========================================================================
   3  *
   4  *      xyzModem.c
   5  *
   6  *      RedBoot stream handler for xyzModem protocol
   7  *
   8  *==========================================================================
   9  *####ECOSGPLCOPYRIGHTBEGIN####
  10  * -------------------------------------------
  11  * This file is part of eCos, the Embedded Configurable Operating System.
  12  * Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
  13  * Copyright (C) 2002 Gary Thomas
  14  *
  15  * eCos is free software; you can redistribute it and/or modify it under
  16  * the terms of the GNU General Public License as published by the Free
  17  * Software Foundation; either version 2 or (at your option) any later version.
  18  *
  19  * eCos is distributed in the hope that it will be useful, but WITHOUT ANY
  20  * WARRANTY; without even the implied warranty of MERCHANTABILITY or
  21  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  22  * for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License along
  25  * with eCos; if not, write to the Free Software Foundation, Inc.,
  26  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  27  *
  28  * As a special exception, if other files instantiate templates or use macros
  29  * or inline functions from this file, or you compile this file and link it
  30  * with other works to produce a work based on this file, this file does not
  31  * by itself cause the resulting work to be covered by the GNU General Public
  32  * License. However the source code for this file must still be made available
  33  * in accordance with section (3) of the GNU General Public License.
  34  *
  35  * This exception does not invalidate any other reasons why a work based on
  36  * this file might be covered by the GNU General Public License.
  37  *
  38  * Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
  39  * at http: *sources.redhat.com/ecos/ecos-license/
  40  * -------------------------------------------
  41  *####ECOSGPLCOPYRIGHTEND####
  42  *==========================================================================
  43  *#####DESCRIPTIONBEGIN####
  44  *
  45  * Author(s):    gthomas
  46  * Contributors: gthomas, tsmith, Yoshinori Sato
  47  * Date:         2000-07-14
  48  * Purpose:
  49  * Description:
  50  *
  51  * This code is part of RedBoot (tm).
  52  *
  53  *####DESCRIPTIONEND####
  54  *
  55  *==========================================================================
  56  */
  57 #include <common.h>
  58 #include <xyzModem.h>
  59 #include <stdarg.h>
  60 #include <crc.h>
  61
  62 /* Assumption - run xyzModem protocol over the console port */
  63
  64 /* Values magic to the protocol */
  65 #define SOH 0x01
  66 #define STX 0x02
  67 #define EOT 0x04
  68 #define ACK 0x06
  69 #define BSP 0x08
  70 #define NAK 0x15
  71 #define CAN 0x18
  72 #define EOF 0x1A  /* ^Z for DOS officionados */
  73
  74 #define USE_YMODEM_LENGTH
  75
  76 /* Data & state local to the protocol */
  77 static struct {
  78 #ifdef REDBOOT
  79     hal_virtual_comm_table_t* __chan;
  80 #else
  81     int *__chan;
  82 #endif
  83     unsigned char pkt[1024], *bufp;
  84     unsigned char blk,cblk,crc1,crc2;
  85     unsigned char next_blk;  /* Expected block */
  86     int len, mode, total_retries;
  87     int total_SOH, total_STX, total_CAN;
  88     bool crc_mode, at_eof, tx_ack;
  89 #ifdef USE_YMODEM_LENGTH
  90     unsigned long file_length, read_length;
  91 #endif
  92 } xyz;
  93
  94 #define xyzModem_CHAR_TIMEOUT            2000  /* 2 seconds */
  95 #define xyzModem_MAX_RETRIES             20
  96 #define xyzModem_MAX_RETRIES_WITH_CRC    10
  97 #define xyzModem_CAN_COUNT                3    /* Wait for 3 CAN before quitting */
  98
  99
 100 #ifndef REDBOOT  /*SB */
 101 typedef int cyg_int32;
 102 int CYGACC_COMM_IF_GETC_TIMEOUT (char chan,char *c) {
 103 #define DELAY 20
 104         unsigned long counter=0;
 105         while (!tstc() && (counter < xyzModem_CHAR_TIMEOUT*1000/DELAY)) {
 106                 udelay(DELAY);
 107                 counter++;
 108         }
 109         if (tstc()) {
 110                 *c=getc();
 111                 return 1;
 112         }
 113         return 0;
 114 }
 115
 116 void CYGACC_COMM_IF_PUTC(char x,char y) {
 117         putc(y);
 118 }
 119
 120 /* Validate a hex character */
 121 __inline__ static bool
 122 _is_hex(char c)
 123 {
 124     return (((c >= '0') && (c <= '9')) ||
 125             ((c >= 'A') && (c <= 'F')) ||
 126             ((c >= 'a') && (c <= 'f')));
 127 }
 128
 129 /* Convert a single hex nibble */
 130 __inline__ static int
 131 _from_hex(char c)
 132 {
 133     int ret = 0;
 134
 135     if ((c >= '0') && (c <= '9')) {
 136         ret = (c - '0');
 137     } else if ((c >= 'a') && (c <= 'f')) {
 138         ret = (c - 'a' + 0x0a);
 139     } else if ((c >= 'A') && (c <= 'F')) {
 140         ret = (c - 'A' + 0x0A);
 141     }
 142     return ret;
 143 }
 144
 145 /* Convert a character to lower case */
 146 __inline__ static char
 147 _tolower(char c)
 148 {
 149     if ((c >= 'A') && (c <= 'Z')) {
 150         c = (c - 'A') + 'a';
 151     }
 152     return c;
 153 }
 154
 155 /* Parse (scan) a number */
 156 bool
 157 parse_num(char *s, unsigned long *val, char **es, char *delim)
 158 {
 159     bool first = true;
 160     int radix = 10;
 161     char c;
 162     unsigned long result = 0;
 163     int digit;
 164
 165     while (*s == ' ') s++;
 166     while (*s) {
 167         if (first && (s[0] == '0') && (_tolower(s[1]) == 'x')) {
 168             radix = 16;
 169             s += 2;
 170         }
 171         first = false;
 172         c = *s++;
 173         if (_is_hex(c) && ((digit = _from_hex(c)) < radix)) {
 174             /* Valid digit */
 175 #ifdef CYGPKG_HAL_MIPS
 176             /* FIXME: tx49 compiler generates 0x2539018 for MUL which */
 177             /* isn't any good. */
 178             if (16 == radix)
 179                 result = result << 4;
 180             else
 181                 result = 10 * result;
 182             result += digit;
 183 #else
 184             result = (result * radix) + digit;
 185 #endif
 186         } else {
 187             if (delim != (char *)0) {
 188                 /* See if this character is one of the delimiters */
 189                 char *dp = delim;
 190                 while (*dp && (c != *dp)) dp++;
 191                 if (*dp) break;  /* Found a good delimiter */
 192             }
 193             return false;  /* Malformatted number */
 194         }
 195     }
 196     *val = result;
 197     if (es != (char **)0) {
 198         *es = s;
 199     }
 200     return true;
 201 }
 202
 203 #endif
 204
 205 #define USE_SPRINTF
 206 #ifdef DEBUG
 207 #ifndef USE_SPRINTF
 208 /*
 209  * Note: this debug setup only works if the target platform has two serial ports
 210  * available so that the other one (currently only port 1) can be used for debug
 211  * messages.
 212  */
 213 static int
 214 zm_dprintf(char *fmt, ...)
 215 {
 216     int cur_console;
 217     va_list args;
 218
 219     va_start(args, fmt);
 220 #ifdef REDBOOT
 221     cur_console = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
 222     CYGACC_CALL_IF_SET_CONSOLE_COMM(1);
 223 #endif
 224     diag_vprintf(fmt, args);
 225 #ifdef REDBOOT
 226     CYGACC_CALL_IF_SET_CONSOLE_COMM(cur_console);
 227 #endif
 228 }
 229
 230 static void
 231 zm_flush(void)
 232 {
 233 }
 234
 235 #else
 236 /*
 237  * Note: this debug setup works by storing the strings in a fixed buffer
 238  */
 239 #define FINAL
 240 #ifdef FINAL
 241 static char *zm_out = (char *)0x00380000;
 242 static char *zm_out_start = (char *)0x00380000;
 243 #else
 244 static char zm_buf[8192];
 245 static char *zm_out=zm_buf;
 246 static char *zm_out_start = zm_buf;
 247
 248 #endif
 249 static int
 250 zm_dprintf(char *fmt, ...)
 251 {
 252     int len;
 253     va_list args;
 254
 255     va_start(args, fmt);
 256     len = diag_vsprintf(zm_out, fmt, args);
 257     zm_out += len;
 258     return len;
 259 }
 260
 261 static void
 262 zm_flush(void)
 263 {
 264 #ifdef REDBOOT
 265     char *p = zm_out_start;
 266     while (*p) mon_write_char(*p++);
 267 #endif
 268     zm_out = zm_out_start;
 269 }
 270 #endif
 271
 272 static void
 273 zm_dump_buf(void *buf, int len)
 274 {
 275 #ifdef REDBOOT
 276     diag_vdump_buf_with_offset(zm_dprintf, buf, len, 0);
 277 #else
 278
 279 #endif
 280 }
 281
 282 static unsigned char zm_buf[2048];
 283 static unsigned char *zm_bp;
 284
 285 static void
 286 zm_new(void)
 287 {
 288     zm_bp = zm_buf;
 289 }
 290
 291 static void
 292 zm_save(unsigned char c)
 293 {
 294     *zm_bp++ = c;
 295 }
 296
 297 static void
 298 zm_dump(int line)
 299 {
 300     zm_dprintf("Packet at line: %d\n", line);
 301     zm_dump_buf(zm_buf, zm_bp-zm_buf);
 302 }
 303
 304 #define ZM_DEBUG(x) x
 305 #else
 306 #define ZM_DEBUG(x)
 307 #endif
 308
 309 /* Wait for the line to go idle */
 310 static void
 311 xyzModem_flush(void)
 312 {
 313     int res;
 314     char c;
 315     while (true) {
 316         res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &c);
 317         if (!res) return;
 318     }
 319 }
 320
 321 static int
 322 xyzModem_get_hdr(void)
 323 {
 324     char c;
 325     int res;
 326     bool hdr_found = false;
 327     int i, can_total, hdr_chars;
 328     unsigned short cksum;
 329
 330     ZM_DEBUG(zm_new());
 331     /* Find the start of a header */
 332     can_total = 0;
 333     hdr_chars = 0;
 334
 335     if (xyz.tx_ack) {
 336         CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
 337         xyz.tx_ack = false;
 338     }
 339     while (!hdr_found) {
 340         res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &c);
 341         ZM_DEBUG(zm_save(c));
 342         if (res) {
 343             hdr_chars++;
 344             switch (c) {
 345             case SOH:
 346                 xyz.total_SOH++;
 347             case STX:
 348                 if (c == STX) xyz.total_STX++;
 349                 hdr_found = true;
 350                 break;
 351             case CAN:
 352                 xyz.total_CAN++;
 353                 ZM_DEBUG(zm_dump(__LINE__));
 354                 if (++can_total == xyzModem_CAN_COUNT) {
 355                     return xyzModem_cancel;
 356                 } else {
 357                     /* Wait for multiple CAN to avoid early quits */
 358                     break;
 359                 }
 360             case EOT:
 361                 /* EOT only supported if no noise */
 362                 if (hdr_chars == 1) {
 363                     CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
 364                     ZM_DEBUG(zm_dprintf("ACK on EOT #%d\n", __LINE__));
 365                     ZM_DEBUG(zm_dump(__LINE__));
 366                     return xyzModem_eof;
 367                 }
 368             default:
 369                 /* Ignore, waiting for start of header */
 370                 ;
 371             }
 372         } else {
 373             /* Data stream timed out */
 374             xyzModem_flush();  /* Toss any current input */
 375             ZM_DEBUG(zm_dump(__LINE__));
 376             CYGACC_CALL_IF_DELAY_US((cyg_int32)250000);
 377             return xyzModem_timeout;
 378         }
 379     }
 380
 381     /* Header found, now read the data */
 382     res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, (char *)&xyz.blk);
 383     ZM_DEBUG(zm_save(xyz.blk));
 384     if (!res) {
 385         ZM_DEBUG(zm_dump(__LINE__));
 386         return xyzModem_timeout;
 387     }
 388     res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, (char *)&xyz.cblk);
 389     ZM_DEBUG(zm_save(xyz.cblk));
 390     if (!res) {
 391         ZM_DEBUG(zm_dump(__LINE__));
 392         return xyzModem_timeout;
 393     }
 394     xyz.len = (c == SOH) ? 128 : 1024;
 395     xyz.bufp = xyz.pkt;
 396     for (i = 0;  i < xyz.len;  i++) {
 397         res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &c);
 398         ZM_DEBUG(zm_save(c));
 399         if (res) {
 400             xyz.pkt[i] = c;
 401         } else {
 402             ZM_DEBUG(zm_dump(__LINE__));
 403             return xyzModem_timeout;
 404         }
 405     }
 406     res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, (char *)&xyz.crc1);
 407     ZM_DEBUG(zm_save(xyz.crc1));
 408     if (!res) {
 409         ZM_DEBUG(zm_dump(__LINE__));
 410         return xyzModem_timeout;
 411     }
 412     if (xyz.crc_mode) {
 413         res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, (char *)&xyz.crc2);
 414         ZM_DEBUG(zm_save(xyz.crc2));
 415         if (!res) {
 416             ZM_DEBUG(zm_dump(__LINE__));
 417             return xyzModem_timeout;
 418         }
 419     }
 420     ZM_DEBUG(zm_dump(__LINE__));
 421     /* Validate the message */
 422     if ((xyz.blk ^ xyz.cblk) != (unsigned char)0xFF) {
 423         ZM_DEBUG(zm_dprintf("Framing error - blk: %x/%x/%x\n", xyz.blk, xyz.cblk, (xyz.blk ^ xyz.cblk)));
 424         ZM_DEBUG(zm_dump_buf(xyz.pkt, xyz.len));
 425         xyzModem_flush();
 426         return xyzModem_frame;
 427     }
 428     /* Verify checksum/CRC */
 429     if (xyz.crc_mode) {
 430         cksum = cyg_crc16(xyz.pkt, xyz.len);
 431         if (cksum != ((xyz.crc1 << 8) | xyz.crc2)) {
 432             ZM_DEBUG(zm_dprintf("CRC error - recvd: %02x%02x, computed: %x\n",
 433                                 xyz.crc1, xyz.crc2, cksum & 0xFFFF));
 434             return xyzModem_cksum;
 435         }
 436     } else {
 437         cksum = 0;
 438         for (i = 0;  i < xyz.len;  i++) {
 439             cksum += xyz.pkt[i];
 440         }
 441         if (xyz.crc1 != (cksum & 0xFF)) {
 442             ZM_DEBUG(zm_dprintf("Checksum error - recvd: %x, computed: %x\n", xyz.crc1, cksum & 0xFF));
 443             return xyzModem_cksum;
 444         }
 445     }
 446     /* If we get here, the message passes [structural] muster */
 447     return 0;
 448 }
 449
 450 int
 451 xyzModem_stream_open(connection_info_t *info, int *err)
 452 {
 453 #ifdef REDBOOT
 454     int console_chan;
 455 #endif
 456     int stat = 0;
 457     int retries = xyzModem_MAX_RETRIES;
 458     int crc_retries = xyzModem_MAX_RETRIES_WITH_CRC;
 459
 460 /*    ZM_DEBUG(zm_out = zm_out_start); */
 461 #ifdef xyzModem_zmodem
 462     if (info->mode == xyzModem_zmodem) {
 463         *err = xyzModem_noZmodem;
 464         return -1;
 465     }
 466 #endif
 467
 468 #ifdef REDBOOT
 469     /* Set up the I/O channel.  Note: this allows for using a different port in the future */
 470     console_chan = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
 471     if (info->chan >= 0) {
 472         CYGACC_CALL_IF_SET_CONSOLE_COMM(info->chan);
 473     } else {
 474         CYGACC_CALL_IF_SET_CONSOLE_COMM(console_chan);
 475     }
 476     xyz.__chan = CYGACC_CALL_IF_CONSOLE_PROCS();
 477
 478     CYGACC_CALL_IF_SET_CONSOLE_COMM(console_chan);
 479     CYGACC_COMM_IF_CONTROL(*xyz.__chan, __COMMCTL_SET_TIMEOUT, xyzModem_CHAR_TIMEOUT);
 480 #else
 481 /* TODO: CHECK ! */
 482     int dummy;
 483     xyz.__chan=&dummy;
 484 #endif
 485     xyz.len = 0;
 486     xyz.crc_mode = true;
 487     xyz.at_eof = false;
 488     xyz.tx_ack = false;
 489     xyz.mode = info->mode;
 490     xyz.total_retries = 0;
 491     xyz.total_SOH = 0;
 492     xyz.total_STX = 0;
 493     xyz.total_CAN = 0;
 494 #ifdef USE_YMODEM_LENGTH
 495     xyz.read_length = 0;
 496     xyz.file_length = 0;
 497 #endif
 498
 499     CYGACC_COMM_IF_PUTC(*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));
 500
 501     if (xyz.mode == xyzModem_xmodem) {
 502             /* X-modem doesn't have an information header - exit here */
 503             xyz.next_blk = 1;
 504             return 0;
 505     }
 506
 507     while (retries-- > 0) {
 508         stat = xyzModem_get_hdr();
 509         if (stat == 0) {
 510             /* Y-modem file information header */
 511             if (xyz.blk == 0) {
 512 #ifdef USE_YMODEM_LENGTH
 513                 /* skip filename */
 514                 while (*xyz.bufp++);
 515                 /* get the length */
 516                 parse_num((char *)xyz.bufp, &xyz.file_length, NULL, " ");
 517 #endif
 518                 /* The rest of the file name data block quietly discarded */
 519                 xyz.tx_ack = true;
 520             }
 521             xyz.next_blk = 1;
 522             xyz.len = 0;
 523             return 0;
 524         } else
 525         if (stat == xyzModem_timeout) {
 526             if (--crc_retries <= 0) xyz.crc_mode = false;
 527             CYGACC_CALL_IF_DELAY_US(5*100000);   /* Extra delay for startup */
 528             CYGACC_COMM_IF_PUTC(*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));
 529             xyz.total_retries++;
 530             ZM_DEBUG(zm_dprintf("NAK (%d)\n", __LINE__));
 531         }
 532         if (stat == xyzModem_cancel) {
 533             break;
 534         }
 535     }
 536     *err = stat;
 537     ZM_DEBUG(zm_flush());
 538     return -1;
 539 }
 540
 541 int
 542 xyzModem_stream_read(char *buf, int size, int *err)
 543 {
 544     int stat, total, len;
 545     int retries;
 546
 547     total = 0;
 548     stat = xyzModem_cancel;
 549     /* Try and get 'size' bytes into the buffer */
 550     while (!xyz.at_eof && (size > 0)) {
 551         if (xyz.len == 0) {
 552             retries = xyzModem_MAX_RETRIES;
 553             while (retries-- > 0) {
 554                 stat = xyzModem_get_hdr();
 555                 if (stat == 0) {
 556                     if (xyz.blk == xyz.next_blk) {
 557                         xyz.tx_ack = true;
 558                         ZM_DEBUG(zm_dprintf("ACK block %d (%d)\n", xyz.blk, __LINE__));
 559                         xyz.next_blk = (xyz.next_blk + 1) & 0xFF;
 560
 561 #if defined(xyzModem_zmodem) || defined(USE_YMODEM_LENGTH)
 562                         if (xyz.mode == xyzModem_xmodem || xyz.file_length == 0) {
 563 #else
 564                         if (1) {
 565 #endif
 566                             /* Data blocks can be padded with ^Z (EOF) characters */
 567                             /* This code tries to detect and remove them */
 568                             if ((xyz.bufp[xyz.len-1] == EOF) &&
 569                                 (xyz.bufp[xyz.len-2] == EOF) &&
 570                                 (xyz.bufp[xyz.len-3] == EOF)) {
 571                                 while (xyz.len && (xyz.bufp[xyz.len-1] == EOF)) {
 572                                     xyz.len--;
 573                                 }
 574                             }
 575                         }
 576
 577 #ifdef USE_YMODEM_LENGTH
 578                         /*
 579                          * See if accumulated length exceeds that of the file.
 580                          * If so, reduce size (i.e., cut out pad bytes)
 581                          * Only do this for Y-modem (and Z-modem should it ever
 582                          * be supported since it can fall back to Y-modem mode).
 583                          */
 584                         if (xyz.mode != xyzModem_xmodem && 0 != xyz.file_length) {
 585                             xyz.read_length += xyz.len;
 586                             if (xyz.read_length > xyz.file_length) {
 587                                 xyz.len -= (xyz.read_length - xyz.file_length);
 588                             }
 589                         }
 590 #endif
 591                         break;
 592                     } else if (xyz.blk == ((xyz.next_blk - 1) & 0xFF)) {
 593                         /* Just re-ACK this so sender will get on with it */
 594                         CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
 595                         continue;  /* Need new header */
 596                     } else {
 597                         stat = xyzModem_sequence;
 598                     }
 599                 }
 600                 if (stat == xyzModem_cancel) {
 601                     break;
 602                 }
 603                 if (stat == xyzModem_eof) {
 604                     CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
 605                     ZM_DEBUG(zm_dprintf("ACK (%d)\n", __LINE__));
 606                     if (xyz.mode == xyzModem_ymodem) {
 607                         CYGACC_COMM_IF_PUTC(*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));
 608                         xyz.total_retries++;
 609                         ZM_DEBUG(zm_dprintf("Reading Final Header\n"));
 610                         stat = xyzModem_get_hdr();
 611                         CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
 612                         ZM_DEBUG(zm_dprintf("FINAL ACK (%d)\n", __LINE__));
 613                     }
 614                     xyz.at_eof = true;
 615                     break;
 616                 }
 617                 CYGACC_COMM_IF_PUTC(*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));
 618                 xyz.total_retries++;
 619                 ZM_DEBUG(zm_dprintf("NAK (%d)\n", __LINE__));
 620             }
 621             if (stat < 0) {
 622                 *err = stat;
 623                 xyz.len = -1;
 624                 return total;
 625             }
 626         }
 627         /* Don't "read" data from the EOF protocol package */
 628         if (!xyz.at_eof) {
 629             len = xyz.len;
 630             if (size < len) len = size;
 631             memcpy(buf, xyz.bufp, len);
 632             size -= len;
 633             buf += len;
 634             total += len;
 635             xyz.len -= len;
 636             xyz.bufp += len;
 637         }
 638     }
 639     return total;
 640 }
 641
 642 void
 643 xyzModem_stream_close(int *err)
 644 {
 645     diag_printf("xyzModem - %s mode, %d(SOH)/%d(STX)/%d(CAN) packets, %d retries\n",
 646                 xyz.crc_mode ? "CRC" : "Cksum",
 647                 xyz.total_SOH, xyz.total_STX, xyz.total_CAN,
 648                 xyz.total_retries);
 649     ZM_DEBUG(zm_flush());
 650 }
 651
 652 /* Need to be able to clean out the input buffer, so have to take the */
 653 /* getc */
 654 void xyzModem_stream_terminate(bool abort, int (*getc)(void))
 655 {
 656   int c;
 657
 658   if (abort) {
 659       ZM_DEBUG(zm_dprintf("!!!! TRANSFER ABORT !!!!\n"));
 660       switch (xyz.mode) {
 661         case xyzModem_xmodem:
 662         case xyzModem_ymodem:
 663           /* The X/YMODEM Spec seems to suggest that multiple CAN followed by an equal */
 664           /* number of Backspaces is a friendly way to get the other end to abort. */
 665           CYGACC_COMM_IF_PUTC(*xyz.__chan,CAN);
 666           CYGACC_COMM_IF_PUTC(*xyz.__chan,CAN);
 667           CYGACC_COMM_IF_PUTC(*xyz.__chan,CAN);
 668           CYGACC_COMM_IF_PUTC(*xyz.__chan,CAN);
 669           CYGACC_COMM_IF_PUTC(*xyz.__chan,BSP);
 670           CYGACC_COMM_IF_PUTC(*xyz.__chan,BSP);
 671           CYGACC_COMM_IF_PUTC(*xyz.__chan,BSP);
 672           CYGACC_COMM_IF_PUTC(*xyz.__chan,BSP);
 673           /* Now consume the rest of what's waiting on the line. */
 674           ZM_DEBUG(zm_dprintf("Flushing serial line.\n"));
 675           xyzModem_flush();
 676           xyz.at_eof = true;
 677         break;
 678 #ifdef xyzModem_zmodem
 679         case xyzModem_zmodem:
 680           /* Might support it some day I suppose. */
 681 #endif
 682         break;
 683       }
 684   } else {
 685       ZM_DEBUG(zm_dprintf("Engaging cleanup mode...\n"));
 686       /*
 687        * Consume any trailing crap left in the inbuffer from
 688        * previous recieved blocks. Since very few files are an exact multiple
 689        * of the transfer block size, there will almost always be some gunk here.
 690        * If we don't eat it now, RedBoot will think the user typed it.
 691        */
 692       ZM_DEBUG(zm_dprintf("Trailing gunk:\n"));
 693       while ((c = (*getc)()) > -1) ;
 694       ZM_DEBUG(zm_dprintf("\n"));
 695       /*
 696        * Make a small delay to give terminal programs like minicom
 697        * time to get control again after their file transfer program
 698        * exits.
 699        */
 700       CYGACC_CALL_IF_DELAY_US((cyg_int32)250000);
 701   }
 702 }
 703
 704 char *
 705 xyzModem_error(int err)
 706 {
 707     switch (err) {
 708     case xyzModem_access:
 709         return "Can't access file";
 710         break;
 711     case xyzModem_noZmodem:
 712         return "Sorry, zModem not available yet";
 713         break;
 714     case xyzModem_timeout:
 715         return "Timed out";
 716         break;
 717     case xyzModem_eof:
 718         return "End of file";
 719         break;
 720     case xyzModem_cancel:
 721         return "Cancelled";
 722         break;
 723     case xyzModem_frame:
 724         return "Invalid framing";
 725         break;
 726     case xyzModem_cksum:
 727         return "CRC/checksum error";
 728         break;
 729     case xyzModem_sequence:
 730         return "Block sequence error";
 731         break;
 732     default:
 733         return "Unknown error";
 734         break;
 735     }
 736 }
 737
 738 /*
 739  * RedBoot interface
 740  */
 741 #if 0 /* SB */
 742 GETC_IO_FUNCS(xyzModem_io, xyzModem_stream_open, xyzModem_stream_close,
 743               xyzModem_stream_terminate, xyzModem_stream_read, xyzModem_error);
 744 RedBoot_load(xmodem, xyzModem_io, false, false, xyzModem_xmodem);
 745 RedBoot_load(ymodem, xyzModem_io, false, false, xyzModem_ymodem);
 746 #endif