765 lines
14 KiB
C
765 lines
14 KiB
C
/*
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* Z M . C
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* ZMODEM protocol primitives
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* 05-09-88 Chuck Forsberg Omen Technology Inc
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*
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* Entry point Functions:
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* zsbhdr(type, hdr) send binary header
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* zshhdr(type, hdr) send hex header
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* zgethdr(hdr, eflag) receive header - binary or hex
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* zsdata(buf, len, frameend) send data
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* zrdata(buf, len) receive data
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* stohdr(pos) store position data in Txhdr
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* long rclhdr(hdr) recover position offset from header
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*/
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#ifndef CANFDX
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#include "zmodem.h"
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#endif
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int Rxtimeout = 100; /* Tenths of seconds to wait for something */
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#ifndef UNSL
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#define UNSL
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#endif
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/* Globals used by ZMODEM functions */
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int Rxframeind; /* ZBIN ZBIN32, or ZHEX type of frame received */
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int Rxtype; /* Type of header received */
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int Rxcount; /* Count of data bytes received */
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char Rxhdr[4]; /* Received header */
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char Txhdr[4]; /* Transmitted header */
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long Rxpos; /* Received file position */
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long Txpos; /* Transmitted file position */
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int Txfcs32; /* TURE means send binary frames with 32 bit FCS */
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int Crc32t; /* Display flag indicating 32 bit CRC being sent */
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int Crc32; /* Display flag indicating 32 bit CRC being received */
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int Znulls; /* Number of nulls to send at beginning of ZDATA hdr */
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char Attn[ZATTNLEN+1]; /* Attention string rx sends to tx on err */
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static int lastsent; /* Last char we sent */
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static int Not8bit; /* Seven bits seen on header */
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static char *frametypes[] = {
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"Carrier Lost", /* -3 */
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"TIMEOUT", /* -2 */
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"ERROR", /* -1 */
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#define FTOFFSET 3
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"ZRQINIT",
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"ZRINIT",
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"ZSINIT",
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"ZACK",
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"ZFILE",
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"ZSKIP",
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"ZNAK",
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"ZABORT",
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"ZFIN",
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"ZRPOS",
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"ZDATA",
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"ZEOF",
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"ZFERR",
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"ZCRC",
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"ZCHALLENGE",
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"ZCOMPL",
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"ZCAN",
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"ZFREECNT",
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"ZCOMMAND",
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"ZSTDERR",
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"xxxxx"
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#define FRTYPES 22 /* Total number of frame types in this array */
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/* not including psuedo negative entries */
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};
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static char badcrc[] = "Bad CRC";
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/* Send ZMODEM binary header hdr of type type */
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void zsbhdr(int type, char *hdr)
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{
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register int n;
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register unsigned short crc;
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vfile("zsbhdr: %s %lx", frametypes[type+FTOFFSET], rclhdr(hdr));
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if (type == ZDATA)
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for (n = Znulls; --n >=0; )
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xsendline(0);
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xsendline(ZPAD); xsendline(ZDLE);
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if ((Crc32t=Txfcs32))
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zsbh32(hdr, type);
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else {
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xsendline(ZBIN); zsendline(type); crc = updcrc(type, 0);
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for (n=4; --n >= 0; ++hdr) {
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zsendline(*hdr);
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crc = updcrc((0377& *hdr), crc);
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}
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crc = updcrc(0,updcrc(0,crc));
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zsendline(crc>>8);
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zsendline(crc);
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}
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if (type != ZDATA)
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flushmo();
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}
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/* Send ZMODEM binary header hdr of type type */
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void zsbh32(char *hdr, int type)
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{
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register int n;
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register UNSL long crc;
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xsendline(ZBIN32); zsendline(type);
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crc = 0xFFFFFFFFL; crc = UPDC32(type, crc);
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for (n=4; --n >= 0; ++hdr) {
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crc = UPDC32((0377 & *hdr), crc);
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zsendline(*hdr);
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}
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crc = ~crc;
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for (n=4; --n >= 0;) {
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zsendline((int)crc);
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crc >>= 8;
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}
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}
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/* Send ZMODEM HEX header hdr of type type */
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void zshhdr(int type, char *hdr)
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{
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register int n;
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register unsigned short crc;
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vfile("zshhdr: %s %lx", frametypes[type+FTOFFSET], rclhdr(hdr));
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sendline(ZPAD); sendline(ZPAD); sendline(ZDLE); sendline(ZHEX);
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zputhex(type);
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Crc32t = 0;
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crc = updcrc(type, 0);
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for (n=4; --n >= 0; ++hdr) {
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zputhex(*hdr); crc = updcrc((0377 & *hdr), crc);
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}
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crc = updcrc(0,updcrc(0,crc));
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zputhex(crc>>8); zputhex(crc);
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/* Make it printable on remote machine */
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sendline(015); sendline(0212);
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/*
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* Uncork the remote in case a fake XOFF has stopped data flow
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*/
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if (type != ZFIN && type != ZACK)
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sendline(021);
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flushmo();
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}
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/*
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* Send binary array buf of length length, with ending ZDLE sequence frameend
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*/
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static char *Zendnames[] = { "ZCRCE", "ZCRCG", "ZCRCQ", "ZCRCW"};
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void zsdata(char *buf, int length, int frameend)
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{
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register unsigned short crc;
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vfile("zsdata: %d %s", length, Zendnames[(frameend-ZCRCE)&3]);
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if (Crc32t)
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zsda32(buf, length, frameend);
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else {
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crc = 0;
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for (;--length >= 0; ++buf) {
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zsendline(*buf); crc = updcrc((0377 & *buf), crc);
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}
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xsendline(ZDLE); xsendline(frameend);
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crc = updcrc(frameend, crc);
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crc = updcrc(0,updcrc(0,crc));
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zsendline(crc>>8); zsendline(crc);
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}
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if (frameend == ZCRCW) {
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xsendline(XON); flushmo();
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}
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}
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void zsda32(char *buf, int length, int frameend)
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{
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register int c;
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register UNSL long crc;
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crc = 0xFFFFFFFFL;
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for (;--length >= 0; ++buf) {
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c = *buf & 0377;
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if (c & 0140)
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xsendline(lastsent = c);
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else
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zsendline(c);
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crc = UPDC32(c, crc);
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}
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xsendline(ZDLE); xsendline(frameend);
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crc = UPDC32(frameend, crc);
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crc = ~crc;
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for (length=4; --length >= 0;) {
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zsendline((int)crc); crc >>= 8;
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}
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}
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/*
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* Receive array buf of max length with ending ZDLE sequence
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* and CRC. Returns the ending character or error code.
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* NB: On errors may store length+1 bytes!
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*/
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int zrdata(char *buf, int length)
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{
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register int c;
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register unsigned short crc;
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register char *end;
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register int d;
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if (Rxframeind == ZBIN32)
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return zrdat32(buf, length);
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crc = Rxcount = 0; end = buf + length;
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while (buf <= end) {
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if ((c = zdlread()) & ~0377) {
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crcfoo:
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switch (c) {
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case GOTCRCE:
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case GOTCRCG:
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case GOTCRCQ:
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case GOTCRCW:
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crc = updcrc((((d=c))&0377), crc);
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if ((c = zdlread()) & ~0377)
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goto crcfoo;
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crc = updcrc(c, crc);
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if ((c = zdlread()) & ~0377)
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goto crcfoo;
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crc = updcrc(c, crc);
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if (crc & 0xFFFF) {
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zperr(badcrc);
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return ERROR;
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}
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Rxcount = length - (end - buf);
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vfile("zrdata: %d %s", Rxcount,
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Zendnames[(d-GOTCRCE)&3]);
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return d;
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case GOTCAN:
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zperr("Sender Canceled");
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return ZCAN;
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case TIMEOUT:
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zperr("TIMEOUT");
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return c;
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default:
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zperr("Bad data subpacket");
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return c;
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}
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}
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*buf++ = c;
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crc = updcrc(c, crc);
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}
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zperr("Data subpacket too long");
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return ERROR;
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}
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int zrdat32(char *buf, int length)
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{
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register int c;
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register UNSL long crc;
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register char *end;
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register int d;
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crc = 0xFFFFFFFFL; Rxcount = 0; end = buf + length;
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while (buf <= end) {
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if ((c = zdlread()) & ~0377) {
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crcfoo:
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switch (c) {
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case GOTCRCE:
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case GOTCRCG:
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case GOTCRCQ:
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case GOTCRCW:
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d = c; c &= 0377;
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crc = UPDC32(c, crc);
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if ((c = zdlread()) & ~0377)
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goto crcfoo;
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crc = UPDC32(c, crc);
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if ((c = zdlread()) & ~0377)
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goto crcfoo;
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crc = UPDC32(c, crc);
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if ((c = zdlread()) & ~0377)
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goto crcfoo;
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crc = UPDC32(c, crc);
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if ((c = zdlread()) & ~0377)
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goto crcfoo;
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crc = UPDC32(c, crc);
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if (crc != 0xDEBB20E3) {
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zperr(badcrc);
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return ERROR;
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}
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Rxcount = length - (end - buf);
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vfile("zrdat32: %d %s", Rxcount,
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Zendnames[(d-GOTCRCE)&3]);
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return d;
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case GOTCAN:
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zperr("Sender Canceled");
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return ZCAN;
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case TIMEOUT:
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zperr("TIMEOUT");
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return c;
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default:
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zperr("Bad data subpacket");
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return c;
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}
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}
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*buf++ = c;
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crc = UPDC32(c, crc);
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}
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zperr("Data subpacket too long");
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return ERROR;
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}
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/*
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* Read a ZMODEM header to hdr, either binary or hex.
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* eflag controls local display of non zmodem characters:
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* 0: no display
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* 1: display printing characters only
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* 2: display all non ZMODEM characters
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* On success, set Zmodem to 1, set Rxpos and return type of header.
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* Otherwise return negative on error.
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* Return ERROR instantly if ZCRCW sequence, for fast error recovery.
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*/
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int zgethdr(char *hdr, int eflag)
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{
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register int c, n, cancount;
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n = Zrwindow + Baudrate; /* Max bytes before start of frame */
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Rxframeind = Rxtype = 0;
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startover:
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cancount = 5;
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again:
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/* Return immediate ERROR if ZCRCW sequence seen */
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switch (c = readline(Rxtimeout)) {
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case RCDO:
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case TIMEOUT:
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goto fifi;
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case CAN:
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gotcan:
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if (--cancount <= 0) {
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c = ZCAN; goto fifi;
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}
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switch (c = readline(1)) {
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case TIMEOUT:
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goto again;
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case ZCRCW:
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c = ERROR;
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/* **** FALL THRU TO **** */
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case RCDO:
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goto fifi;
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default:
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break;
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case CAN:
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if (--cancount <= 0) {
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c = ZCAN; goto fifi;
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}
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goto again;
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}
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/* **** FALL THRU TO **** */
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default:
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agn2:
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if ( --n == 0) {
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zperr("Garbage count exceeded");
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return(ERROR);
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}
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if (eflag && ((c &= 0177) & 0140))
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bttyout(c);
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else if (eflag > 1)
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bttyout(c);
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#ifdef UNIX
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fflush(stderr);
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#endif
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goto startover;
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case ZPAD|0200: /* This is what we want. */
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Not8bit = c;
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case ZPAD: /* This is what we want. */
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break;
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}
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cancount = 5;
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splat:
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switch (c = noxrd7()) {
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case ZPAD:
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goto splat;
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case RCDO:
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case TIMEOUT:
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goto fifi;
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default:
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goto agn2;
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case ZDLE: /* This is what we want. */
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break;
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}
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switch (c = noxrd7()) {
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case RCDO:
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case TIMEOUT:
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goto fifi;
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case ZBIN:
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Rxframeind = ZBIN; Crc32 = FALSE;
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c = zrbhdr(hdr);
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break;
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case ZBIN32:
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Crc32 = Rxframeind = ZBIN32;
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c = zrbhdr32(hdr);
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break;
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case ZHEX:
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Rxframeind = ZHEX; Crc32 = FALSE;
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c = zrhhdr(hdr);
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break;
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case CAN:
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goto gotcan;
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default:
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goto agn2;
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}
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Rxpos = hdr[ZP3] & 0377;
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Rxpos = (Rxpos<<8) + (hdr[ZP2] & 0377);
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Rxpos = (Rxpos<<8) + (hdr[ZP1] & 0377);
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Rxpos = (Rxpos<<8) + (hdr[ZP0] & 0377);
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fifi:
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switch (c) {
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case GOTCAN:
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c = ZCAN;
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/* **** FALL THRU TO **** */
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case ZNAK:
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case ZCAN:
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case ERROR:
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case TIMEOUT:
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case RCDO:
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zperr("Got %s", frametypes[c+FTOFFSET]);
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/* **** FALL THRU TO **** */
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default:
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if (c >= -3 && c <= FRTYPES)
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vfile("zgethdr: %s %lx", frametypes[c+FTOFFSET], Rxpos);
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else
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vfile("zgethdr: %d %lx", c, Rxpos);
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}
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return c;
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}
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/* Receive a binary style header (type and position) */
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int zrbhdr(char *hdr)
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{
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register int c, n;
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register unsigned short crc;
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if ((c = zdlread()) & ~0377)
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return c;
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Rxtype = c;
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crc = updcrc(c, 0);
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for (n=4; --n >= 0; ++hdr) {
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if ((c = zdlread()) & ~0377)
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return c;
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crc = updcrc(c, crc);
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*hdr = c;
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}
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if ((c = zdlread()) & ~0377)
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return c;
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crc = updcrc(c, crc);
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if ((c = zdlread()) & ~0377)
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return c;
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crc = updcrc(c, crc);
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if (crc & 0xFFFF) {
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zperr(badcrc);
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return ERROR;
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}
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#ifdef ZMODEM
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Protocol = ZMODEM;
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#endif
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Zmodem = 1;
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return Rxtype;
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}
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/* Receive a binary style header (type and position) with 32 bit FCS */
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int zrbhdr32(char *hdr)
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{
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register int c, n;
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register UNSL long crc;
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if ((c = zdlread()) & ~0377)
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return c;
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Rxtype = c;
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crc = 0xFFFFFFFFL; crc = UPDC32(c, crc);
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#ifdef DEBUGZ
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vfile("zrbhdr32 c=%X crc=%lX", c, crc);
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#endif
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for (n=4; --n >= 0; ++hdr) {
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if ((c = zdlread()) & ~0377)
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return c;
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crc = UPDC32(c, crc);
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*hdr = c;
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#ifdef DEBUGZ
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vfile("zrbhdr32 c=%X crc=%lX", c, crc);
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#endif
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}
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for (n=4; --n >= 0;) {
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if ((c = zdlread()) & ~0377)
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return c;
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crc = UPDC32(c, crc);
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#ifdef DEBUGZ
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vfile("zrbhdr32 c=%X crc=%lX", c, crc);
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#endif
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}
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if (crc != 0xDEBB20E3) {
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zperr(badcrc);
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return ERROR;
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}
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#ifdef ZMODEM
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Protocol = ZMODEM;
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#endif
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Zmodem = 1;
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return Rxtype;
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}
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/* Receive a hex style header (type and position) */
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int zrhhdr(char *hdr)
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{
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register int c;
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register unsigned short crc;
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register int n;
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if ((c = zgethex()) < 0)
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return c;
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Rxtype = c;
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crc = updcrc(c, 0);
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for (n=4; --n >= 0; ++hdr) {
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if ((c = zgethex()) < 0)
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return c;
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crc = updcrc(c, crc);
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*hdr = c;
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}
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if ((c = zgethex()) < 0)
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return c;
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crc = updcrc(c, crc);
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if ((c = zgethex()) < 0)
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return c;
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crc = updcrc(c, crc);
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if (crc & 0xFFFF) {
|
|
zperr(badcrc); return ERROR;
|
|
}
|
|
switch ( c = readline(1)) {
|
|
case 0215:
|
|
Not8bit = c;
|
|
/* **** FALL THRU TO **** */
|
|
case 015:
|
|
/* Throw away possible cr/lf */
|
|
switch (c = readline(1)) {
|
|
case 012:
|
|
Not8bit |= c;
|
|
}
|
|
}
|
|
#ifdef ZMODEM
|
|
Protocol = ZMODEM;
|
|
#endif
|
|
Zmodem = 1; return Rxtype;
|
|
}
|
|
|
|
/* Send a byte as two hex digits */
|
|
void zputhex(int c)
|
|
{
|
|
static char digits[] = "0123456789abcdef";
|
|
|
|
if (Verbose>8)
|
|
vfile("zputhex: %02X", c);
|
|
sendline(digits[(c&0xF0)>>4]);
|
|
sendline(digits[(c)&0xF]);
|
|
}
|
|
|
|
/*
|
|
* Send character c with ZMODEM escape sequence encoding.
|
|
* Escape XON, XOFF. Escape CR following @ (Telenet net escape)
|
|
*/
|
|
void zsendline(int c)
|
|
{
|
|
|
|
/* Quick check for non control characters */
|
|
if (c & 0140)
|
|
xsendline(lastsent = c);
|
|
else {
|
|
switch (c &= 0377) {
|
|
case ZDLE:
|
|
xsendline(ZDLE);
|
|
xsendline (lastsent = (c ^= 0100));
|
|
break;
|
|
case 015:
|
|
case 0215:
|
|
if (!Zctlesc && (lastsent & 0177) != '@')
|
|
goto sendit;
|
|
/* **** FALL THRU TO **** */
|
|
case 020:
|
|
case 021:
|
|
case 023:
|
|
case 0220:
|
|
case 0221:
|
|
case 0223:
|
|
xsendline(ZDLE);
|
|
c ^= 0100;
|
|
sendit:
|
|
xsendline(lastsent = c);
|
|
break;
|
|
default:
|
|
if (Zctlesc && ! (c & 0140)) {
|
|
xsendline(ZDLE);
|
|
c ^= 0100;
|
|
}
|
|
xsendline(lastsent = c);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Decode two lower case hex digits into an 8 bit byte value */
|
|
int zgethex()
|
|
{
|
|
register int c;
|
|
|
|
c = zgeth1();
|
|
if (Verbose>8)
|
|
vfile("zgethex: %02X", c);
|
|
return c;
|
|
}
|
|
int zgeth1()
|
|
{
|
|
register int c, n;
|
|
|
|
if ((c = noxrd7()) < 0)
|
|
return c;
|
|
n = c - '0';
|
|
if (n > 9)
|
|
n -= ('a' - ':');
|
|
if (n & ~0xF)
|
|
return ERROR;
|
|
if ((c = noxrd7()) < 0)
|
|
return c;
|
|
c -= '0';
|
|
if (c > 9)
|
|
c -= ('a' - ':');
|
|
if (c & ~0xF)
|
|
return ERROR;
|
|
c += (n<<4);
|
|
return c;
|
|
}
|
|
|
|
/*
|
|
* Read a byte, checking for ZMODEM escape encoding
|
|
* including CAN*5 which represents a quick abort
|
|
*/
|
|
int zdlread()
|
|
{
|
|
register int c;
|
|
|
|
again:
|
|
/* Quick check for non control characters */
|
|
if ((c = readline(Rxtimeout)) & 0140)
|
|
return c;
|
|
switch (c) {
|
|
case ZDLE:
|
|
break;
|
|
case 023:
|
|
case 0223:
|
|
case 021:
|
|
case 0221:
|
|
goto again;
|
|
default:
|
|
if (Zctlesc && !(c & 0140)) {
|
|
goto again;
|
|
}
|
|
return c;
|
|
}
|
|
again2:
|
|
if ((c = readline(Rxtimeout)) < 0)
|
|
return c;
|
|
if (c == CAN && (c = readline(Rxtimeout)) < 0)
|
|
return c;
|
|
if (c == CAN && (c = readline(Rxtimeout)) < 0)
|
|
return c;
|
|
if (c == CAN && (c = readline(Rxtimeout)) < 0)
|
|
return c;
|
|
switch (c) {
|
|
case CAN:
|
|
return GOTCAN;
|
|
case ZCRCE:
|
|
case ZCRCG:
|
|
case ZCRCQ:
|
|
case ZCRCW:
|
|
return (c | GOTOR);
|
|
case ZRUB0:
|
|
return 0177;
|
|
case ZRUB1:
|
|
return 0377;
|
|
case 023:
|
|
case 0223:
|
|
case 021:
|
|
case 0221:
|
|
goto again2;
|
|
default:
|
|
if (Zctlesc && ! (c & 0140)) {
|
|
goto again2;
|
|
}
|
|
if ((c & 0140) == 0100)
|
|
return (c ^ 0100);
|
|
break;
|
|
}
|
|
if (Verbose>1)
|
|
zperr("Bad escape sequence %x", c);
|
|
return ERROR;
|
|
}
|
|
|
|
/*
|
|
* Read a character from the modem line with timeout.
|
|
* Eat parity, XON and XOFF characters.
|
|
*/
|
|
int noxrd7()
|
|
{
|
|
register int c;
|
|
|
|
for (;;) {
|
|
if ((c = readline(Rxtimeout)) < 0)
|
|
return c;
|
|
switch (c &= 0177) {
|
|
case XON:
|
|
case XOFF:
|
|
continue;
|
|
default:
|
|
if (Zctlesc && !(c & 0140))
|
|
continue;
|
|
case '\r':
|
|
case '\n':
|
|
case ZDLE:
|
|
return c;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Store long integer pos in Txhdr */
|
|
void stohdr(long pos)
|
|
{
|
|
Txhdr[ZP0] = pos;
|
|
Txhdr[ZP1] = pos>>8;
|
|
Txhdr[ZP2] = pos>>16;
|
|
Txhdr[ZP3] = pos>>24;
|
|
}
|
|
|
|
/* Recover a long integer from a header */
|
|
long
|
|
rclhdr(char *hdr)
|
|
{
|
|
register long l;
|
|
|
|
l = (hdr[ZP3] & 0377);
|
|
l = (l << 8) | (hdr[ZP2] & 0377);
|
|
l = (l << 8) | (hdr[ZP1] & 0377);
|
|
l = (l << 8) | (hdr[ZP0] & 0377);
|
|
return l;
|
|
}
|
|
|
|
/* End of zm.c */
|