995 lines
20 KiB
C
995 lines
20 KiB
C
/*
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* $Id: zmmisc.c,v 1.7 2005/10/11 20:49:46 mbse Exp $
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*
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* Z M . C
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* Copyright 1994 Omen Technology Inc All Rights Reserved
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* ZMODEM protocol primitives
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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) 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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*
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* This version implements numerous enhancements including ZMODEM
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* Run Length Encoding and variable length headers. These
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* features were not funded by the original Telenet development
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* contract.
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*
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* This software may be freely used for educational (didactic
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* only) purposes. This software may also be freely used to
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* support file transfer operations to or from licensed Omen
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* Technology products. Use with other commercial or shareware
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* programs (Crosstalk, Procomm, etc.) REQUIRES REGISTRATION.
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*
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* Any programs which use part or all of this software must be
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* provided in source form with this notice intact except by
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* written permission from Omen Technology Incorporated.
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*
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* Use of this software for commercial or administrative purposes
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* except when exclusively limited to interfacing Omen Technology
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* products requires a per port license payment of $20.00 US per
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* port (less in quantity). Use of this code by inclusion,
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* decompilation, reverse engineering or any other means
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* constitutes agreement to these conditions and acceptance of
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* liability to license the materials and payment of reasonable
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* legal costs necessary to enforce this license agreement.
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*
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*
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* Omen Technology Inc
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* Post Office Box 4681
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* Portland OR 97208
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*
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* This code is made available in the hope it will be useful,
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* BUT WITHOUT ANY WARRANTY OF ANY KIND OR LIABILITY FOR ANY
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* DAMAGES OF ANY KIND.
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*
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*/
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static void zputhex(int);
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static void zsbh32(int,char*,int,int);
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static void zsda32(char*,int,int);
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static int zrdat32(char*,int);
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static int noxrd7(void);
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static int zrbhd32(char*);
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static int zrbhdr(char*);
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static int zrhhdr(char*);
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static int zgethex(void);
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static int zgeth1(void);
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static void garbitch(void);
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#include "../config.h"
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#include "../lib/mbselib.h"
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#include "../lib/nodelist.h"
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#include "ttyio.h"
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#include "session.h"
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#include "zmodem.h"
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/* Original zm.c timing was in tenths of seconds, but our current ttyio driver
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does timing in whole seconds.
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*/
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static int Rxtimeout = 10; /* Seconds to wait for something */
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int Zctlesc;
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/* Globals used by ZMODEM functions */
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int Rxframeind; /* ZBIN ZBIN32, or ZHEX type of frame */
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int Rxtype; /* Type of header received */
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int Rxhlen; /* Length of header received */
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int Rxcount; /* Count of data bytes received */
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char Rxhdr[ZMAXHLEN]; /* Received header */
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char Txhdr[ZMAXHLEN]; /* Transmitted header */
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int Rxpos; /* Received file position */
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int Txpos; /* Transmitted file position */
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int Txfcs32; /* TRUE means send binary frames with 32 bit FCS */
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int Crc32t; /* Controls 32 bit CRC being sent */
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/* 1 == CRC32, 2 == CRC32 + RLE */
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int Crc32r; /* Indicates/controls 32 bit CRC being received */
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/* 0 == CRC16, 1 == CRC32, 2 == CRC32 + RLE */
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int Usevhdrs; /* Use variable length headers */
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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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char *Altcan; /* Alternate canit string */
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char *txbuf=NULL;
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char *rxbuf=NULL;
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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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char *frametypes[] = {
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(char *)"EMPTY", /* -16 */
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(char *)"Can't be (-15)",
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(char *)"Can't be (-14)",
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(char *)"Can't be (-13)",
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(char *)"Can't be (-12)",
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(char *)"Can't be (-11)",
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(char *)"Can't be (-10)",
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(char *)"Can't be (-9)",
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(char *)"HANGUP", /* -8 */
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(char *)"Can't be (-7)",
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(char *)"Can't be (-6)",
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(char *)"Can't be (-5)",
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(char *)"EOFILE", /* -4 */
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(char *)"Can't be (-3)",
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(char *)"TIMEOUT", /* -2 */
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(char *)"ERROR", /* -1 */
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(char *)"ZRQINIT",
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(char *)"ZRINIT",
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(char *)"ZSINIT",
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(char *)"ZACK",
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(char *)"ZFILE",
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(char *)"ZSKIP",
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(char *)"ZNAK",
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(char *)"ZABORT",
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(char *)"ZFIN",
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(char *)"ZRPOS",
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(char *)"ZDATA",
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(char *)"ZEOF",
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(char *)"ZFERR",
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(char *)"ZCRC",
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(char *)"ZCHALLENGE",
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(char *)"ZCOMPL",
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(char *)"ZCAN",
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(char *)"ZFREECNT",
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(char *)"ZCOMMAND",
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(char *)"ZSTDERR",
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(char *)"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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/***** Hack by mj ***********************************************************/
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/*
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* Buffer for outgoing frames. Sending them with single character write()'s
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* is a waste of processor time and causes severe performance degradation
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* on TCP and ISDN connections.
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*/
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#define FRAME_BUFFER_SIZE 16384
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static char *frame_buffer=NULL;
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static int frame_length = 0;
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#define BUFFER_CLEAR() do { frame_length=0; } while(0)
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#define BUFFER_BYTE(c) do { frame_buffer[frame_length++]=(c); } while(0)
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#define BUFFER_FLUSH() do { PUT(frame_buffer, frame_length); \
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frame_length=0; } while(0);
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/****************************************************************************/
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void get_frame_buffer(void)
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{
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if (frame_buffer == NULL)
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frame_buffer = malloc(FRAME_BUFFER_SIZE);
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}
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void free_frame_buffer(void)
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{
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if (frame_buffer)
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free(frame_buffer);
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frame_buffer = NULL;
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}
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/*
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* Send ZMODEM binary header hdr of type type
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*/
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void zsbhdr(int len, int type, register char *shdr)
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{
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register int n;
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register unsigned short crc;
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Syslog('z', "zsbhdr: %c %d %s %lx", Usevhdrs?'v':'f', len, frametypes[type+FTOFFSET], rclhdr(shdr));
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BUFFER_CLEAR();
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if (type == ZDATA)
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for (n = Znulls; --n >=0; )
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BUFFER_BYTE(0);
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BUFFER_BYTE(ZPAD); BUFFER_BYTE(ZDLE);
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switch (Crc32t=Txfcs32) {
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case 2:
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zsbh32(len, shdr, type, Usevhdrs?ZVBINR32:ZBINR32);
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BUFFER_FLUSH(); break;
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case 1:
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zsbh32(len, shdr, type, Usevhdrs?ZVBIN32:ZBIN32); break;
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default:
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if (Usevhdrs) {
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BUFFER_BYTE(ZVBIN);
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zsendline(len);
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}
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else
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BUFFER_BYTE(ZBIN);
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zsendline(type);
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crc = updcrc16(type, 0);
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for (n=len; --n >= 0; ++shdr) {
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zsendline(*shdr);
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crc = updcrc16((0377& *shdr), crc);
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}
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crc = updcrc16(0,updcrc16(0,crc));
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zsendline(((int)(crc>>8)));
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zsendline(crc);
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}
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BUFFER_FLUSH();
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}
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/*
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* Send ZMODEM binary header hdr of type type
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*/
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void zsbh32(int len, register char *shdr, int type, int flavour)
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{
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register int n;
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register unsigned int crc;
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BUFFER_BYTE(flavour);
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if (Usevhdrs)
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zsendline(len);
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zsendline(type);
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crc = 0xFFFFFFFFL; crc = updcrc32(type, crc);
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for (n=len; --n >= 0; ++shdr) {
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crc = updcrc32((0377 & *shdr), crc);
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zsendline(*shdr);
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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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/*
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* Send ZMODEM HEX header hdr of type type
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*/
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void zshhdr(int len, int type, register char *shdr)
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{
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register int n;
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register unsigned short crc;
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Syslog('z', "zshhdr: %c %d %s %ld", Usevhdrs?'v':'f', len, frametypes[type+FTOFFSET], rclhdr(shdr));
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BUFFER_CLEAR();
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BUFFER_BYTE(ZPAD);
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BUFFER_BYTE(ZPAD);
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BUFFER_BYTE(ZDLE);
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if (Usevhdrs) {
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BUFFER_BYTE(ZVHEX);
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zputhex(len);
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}
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else
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BUFFER_BYTE(ZHEX);
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zputhex(type);
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Crc32t = 0;
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crc = updcrc16(type, 0);
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for (n=len; --n >= 0; ++shdr) {
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zputhex(*shdr); crc = updcrc16((0377 & *shdr), crc);
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}
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crc = updcrc16(0,updcrc16(0,crc));
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zputhex(((int)(crc>>8))); zputhex(crc);
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/*
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* Make it printable on remote machine
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*/
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BUFFER_BYTE(015);
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BUFFER_BYTE(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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BUFFER_BYTE(021);
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BUFFER_FLUSH();
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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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char *Zendnames[] = {(char *)"ZCRCE",(char *)"ZCRCG",(char *)"ZCRCQ",(char *)"ZCRCW"};
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void zsdata(register char *buf, int length, int frameend)
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{
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register unsigned short crc;
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Syslog('z', "zsdata: %d %s", length, Zendnames[(frameend-ZCRCE)&3]);
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BUFFER_CLEAR();
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switch (Crc32t) {
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case 1:
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zsda32(buf, length, frameend); break;
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case 2:
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zsdar32(buf, length, frameend); break;
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default:
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crc = 0;
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for (;--length >= 0; ++buf) {
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zsendline(*buf); crc = updcrc16((0377 & *buf), crc);
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}
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BUFFER_BYTE(ZDLE); BUFFER_BYTE(frameend);
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crc = updcrc16(frameend, crc);
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crc = updcrc16(0,updcrc16(0,crc));
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zsendline(((int)(crc>>8))); zsendline(crc);
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}
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if (frameend == ZCRCW)
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BUFFER_BYTE(XON);
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BUFFER_FLUSH();
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}
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void zsda32(register char *buf, int length, int frameend)
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{
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register int c;
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register unsigned int 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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BUFFER_BYTE(lastsent = c);
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else
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zsendline(c);
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crc = updcrc32(c, crc);
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}
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BUFFER_BYTE(ZDLE);
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BUFFER_BYTE(frameend);
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crc = updcrc32(frameend, crc);
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crc = ~crc;
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for (c=4; --c >= 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(register 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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switch (Crc32r) {
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case 1:
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return zrdat32(buf, length);
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case 2:
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return zrdatr32(buf, length);
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}
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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 = updcrc16((((d=c))&0377), crc);
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if ((c = zdlread()) & ~0377)
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goto crcfoo;
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crc = updcrc16(c, crc);
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if ((c = zdlread()) & ~0377)
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goto crcfoo;
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crc = updcrc16(c, crc);
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if (crc & 0xFFFF) {
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Syslog('+', "Zmodem zrdata: Bad CRC");
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return TERROR;
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}
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Rxcount = length - (end - buf);
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Syslog('z', "zrdata: %d %s", Rxcount, Zendnames[(d-GOTCRCE)&3]);
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return d;
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case GOTCAN:
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Syslog('+', "Zmodem: Sender Canceled");
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return ZCAN;
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case TIMEOUT:
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Syslog('+', "Zmodem: TIMEOUT receiving data");
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return c;
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case HANGUP:
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Syslog('+', "Zmodem: Carrier lost while receiving");
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return c;
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default:
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garbitch();
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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 = updcrc16(c, crc);
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}
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Syslog('+', "Zmodem: Data subpacket too long");
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return TERROR;
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}
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int zrdat32(register char *buf, int length)
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{
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register int c;
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register unsigned int 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 = updcrc32(c, crc);
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if ((c = zdlread()) & ~0377)
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goto crcfoo;
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crc = updcrc32(c, crc);
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if ((c = zdlread()) & ~0377)
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goto crcfoo;
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crc = updcrc32(c, crc);
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if ((c = zdlread()) & ~0377)
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goto crcfoo;
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crc = updcrc32(c, crc);
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if ((c = zdlread()) & ~0377)
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goto crcfoo;
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crc = updcrc32(c, crc);
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if (crc != 0xDEBB20E3) {
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Syslog('+', "Zmodem zrdat32: Bad CRC");
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return TERROR;
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}
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Rxcount = length - (end - buf);
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Syslog('z', "zrdat32: %d %s", Rxcount, Zendnames[(d-GOTCRCE)&3]);
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return d;
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case GOTCAN:
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Syslog('+', "Zmodem: Sender Canceled");
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return ZCAN;
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case TIMEOUT:
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Syslog('+', "Zmodem: TIMEOUT");
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return c;
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case HANGUP:
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Syslog('+', "Zmodem: Carrier lost while receiving");
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return c;
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default:
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garbitch();
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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 = updcrc32(c, crc);
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}
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Syslog('+', "Zmodem: Data subpacket too long");
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return TERROR;
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}
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void garbitch(void)
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{
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Syslog('+', "Zmodem: Garbled data subpacket");
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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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*
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* Set Rxhlen to size of header (default 4) (valid if good hdr)
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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 *shdr)
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{
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register int c, n, cancount;
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int Zrwindow = 1400;
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int Baudrate = 9600;
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n = Zrwindow + Baudrate;
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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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/*
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* Return immediate ERROR if ZCRCW sequence seen
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*/
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if (((c = GETCHAR(Rxtimeout)) < 0) && (c != TIMEOUT))
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goto fifi;
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else switch(c) {
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case 021: case 0221:
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goto again;
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case HANGUP:
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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 = GETCHAR(Rxtimeout)) {
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case TIMEOUT:
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goto again;
|
|
case ZCRCW:
|
|
switch (GETCHAR(Rxtimeout)) {
|
|
case TIMEOUT:
|
|
c = TERROR; goto fifi;
|
|
case HANGUP:
|
|
goto fifi;
|
|
default:
|
|
goto agn2;
|
|
}
|
|
case HANGUP:
|
|
goto fifi;
|
|
default:
|
|
break;
|
|
case CAN:
|
|
if (--cancount <= 0) {
|
|
c = ZCAN; goto fifi;
|
|
}
|
|
goto again;
|
|
}
|
|
/* **** FALL THRU TO **** */
|
|
default:
|
|
agn2:
|
|
#define GCOUNT (-4)
|
|
if ( --n == 0) {
|
|
c = GCOUNT; goto fifi;
|
|
}
|
|
goto startover;
|
|
case ZPAD|0200: /* This is what we want. */
|
|
Not8bit = c;
|
|
case ZPAD: /* This is what we want. */
|
|
break;
|
|
}
|
|
cancount = 5;
|
|
splat:
|
|
switch (c = noxrd7()) {
|
|
case ZPAD:
|
|
goto splat;
|
|
case HANGUP:
|
|
case TIMEOUT:
|
|
goto fifi;
|
|
default:
|
|
goto agn2;
|
|
case ZDLE: /* This is what we want. */
|
|
break;
|
|
}
|
|
|
|
|
|
Rxhlen = 4; /* Set default length */
|
|
Rxframeind = c = noxrd7();
|
|
switch (c) {
|
|
case ZVBIN32:
|
|
if ((Rxhlen = c = zdlread()) < 0)
|
|
goto fifi;
|
|
if (c > ZMAXHLEN)
|
|
goto agn2;
|
|
Crc32r = 1; c = zrbhd32(shdr); break;
|
|
case ZBIN32:
|
|
if (Usevhdrs)
|
|
goto agn2;
|
|
Crc32r = 1; c = zrbhd32(shdr); break;
|
|
case ZVBINR32:
|
|
if ((Rxhlen = c = zdlread()) < 0)
|
|
goto fifi;
|
|
if (c > ZMAXHLEN)
|
|
goto agn2;
|
|
Crc32r = 2; c = zrbhd32(shdr); break;
|
|
case ZBINR32:
|
|
if (Usevhdrs)
|
|
goto agn2;
|
|
Crc32r = 2; c = zrbhd32(shdr); break;
|
|
case HANGUP:
|
|
case TIMEOUT:
|
|
goto fifi;
|
|
case ZVBIN:
|
|
if ((Rxhlen = c = zdlread()) < 0)
|
|
goto fifi;
|
|
if (c > ZMAXHLEN)
|
|
goto agn2;
|
|
Crc32r = 0; c = zrbhdr(shdr); break;
|
|
case ZBIN:
|
|
if (Usevhdrs)
|
|
goto agn2;
|
|
Crc32r = 0; c = zrbhdr(shdr); break;
|
|
case ZVHEX:
|
|
if ((Rxhlen = c = zgethex()) < 0)
|
|
goto fifi;
|
|
if (c > ZMAXHLEN)
|
|
goto agn2;
|
|
Crc32r = 0; c = zrhhdr(shdr); break;
|
|
case ZHEX:
|
|
if (Usevhdrs)
|
|
goto agn2;
|
|
Crc32r = 0; c = zrhhdr(shdr); break;
|
|
case CAN:
|
|
goto gotcan;
|
|
default:
|
|
goto agn2;
|
|
}
|
|
for (n = Rxhlen; ++n < ZMAXHLEN; ) /* Clear unused hdr bytes */
|
|
shdr[n] = 0;
|
|
Rxpos = shdr[ZP3] & 0377;
|
|
Rxpos = (Rxpos<<8) + (shdr[ZP2] & 0377);
|
|
Rxpos = (Rxpos<<8) + (shdr[ZP1] & 0377);
|
|
Rxpos = (Rxpos<<8) + (shdr[ZP0] & 0377);
|
|
fifi:
|
|
switch (c) {
|
|
case GOTCAN:
|
|
c = ZCAN;
|
|
/* **** FALL THRU TO **** */
|
|
case ZNAK:
|
|
case ZCAN:
|
|
case TERROR:
|
|
case TIMEOUT:
|
|
case HANGUP:
|
|
Syslog('+', "Zmodem: Got %s", frametypes[c+FTOFFSET]);
|
|
/* **** FALL THRU TO **** */
|
|
default:
|
|
if (c >= -FTOFFSET && c <= FRTYPES)
|
|
Syslog('z', "zgethdr: %c %d %s %ld", Rxframeind, Rxhlen, frametypes[c+FTOFFSET], Rxpos);
|
|
else
|
|
Syslog('z', "zgethdr: %c %d %ld", Rxframeind, c, Rxpos);
|
|
}
|
|
/* Use variable length headers if we got one */
|
|
if (c >= 0 && c <= FRTYPES && Rxframeind & 040)
|
|
Usevhdrs = 1;
|
|
return c;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Receive a binary style header (type and position)
|
|
*/
|
|
int zrbhdr(register char *shdr)
|
|
{
|
|
register int c, n;
|
|
register unsigned short crc;
|
|
|
|
if ((c = zdlread()) & ~0377)
|
|
return c;
|
|
Rxtype = c;
|
|
crc = updcrc16(c, 0);
|
|
|
|
for (n=Rxhlen; --n >= 0; ++shdr) {
|
|
if ((c = zdlread()) & ~0377)
|
|
return c;
|
|
crc = updcrc16(c, crc);
|
|
*shdr = c;
|
|
}
|
|
if ((c = zdlread()) & ~0377)
|
|
return c;
|
|
crc = updcrc16(c, crc);
|
|
if ((c = zdlread()) & ~0377)
|
|
return c;
|
|
crc = updcrc16(c, crc);
|
|
if (crc & 0xFFFF) {
|
|
Syslog('+', "Zmodem zrbhdr: Bad CRC");
|
|
return TERROR;
|
|
}
|
|
return Rxtype;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Receive a binary style header (type and position) with 32 bit FCS
|
|
*/
|
|
int zrbhd32(register char *shdr)
|
|
{
|
|
register int c, n;
|
|
register unsigned int crc;
|
|
|
|
if ((c = zdlread()) & ~0377)
|
|
return c;
|
|
Rxtype = c;
|
|
crc = 0xFFFFFFFFL; crc = updcrc32(c, crc);
|
|
|
|
for (n=Rxhlen; --n >= 0; ++shdr) {
|
|
if ((c = zdlread()) & ~0377)
|
|
return c;
|
|
crc = updcrc32(c, crc);
|
|
*shdr = c;
|
|
}
|
|
for (n=4; --n >= 0;) {
|
|
if ((c = zdlread()) & ~0377)
|
|
return c;
|
|
crc = updcrc32(c, crc);
|
|
}
|
|
if (crc != 0xDEBB20E3) {
|
|
Syslog('+', "Zmodem zrbhd32: Bad CRC");
|
|
return TERROR;
|
|
}
|
|
return Rxtype;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Receive a hex style header (type and position)
|
|
*/
|
|
int zrhhdr(char *shdr)
|
|
{
|
|
register int c;
|
|
register unsigned short crc;
|
|
register int n;
|
|
|
|
if ((c = zgethex()) < 0)
|
|
return c;
|
|
Rxtype = c;
|
|
crc = updcrc16(c, 0);
|
|
|
|
for (n=Rxhlen; --n >= 0; ++shdr) {
|
|
if ((c = zgethex()) < 0)
|
|
return c;
|
|
crc = updcrc16(c, crc);
|
|
*shdr = c;
|
|
}
|
|
if ((c = zgethex()) < 0)
|
|
return c;
|
|
crc = updcrc16(c, crc);
|
|
if ((c = zgethex()) < 0)
|
|
return c;
|
|
crc = updcrc16(c, crc);
|
|
if (crc & 0xFFFF) {
|
|
Syslog('+', "Zmodem zrhhdr: Bad CRC");
|
|
return TERROR;
|
|
}
|
|
switch (c = GETCHAR(Rxtimeout)) {
|
|
case 0215:
|
|
Not8bit = c;
|
|
/* **** FALL THRU TO **** */
|
|
case 015:
|
|
/* Throw away possible cr/lf */
|
|
switch (c = GETCHAR(Rxtimeout)) {
|
|
case 012:
|
|
Not8bit |= c;
|
|
}
|
|
}
|
|
if (c < 0)
|
|
return c;
|
|
return Rxtype;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Send a byte as two hex digits
|
|
*/
|
|
void zputhex(register int c)
|
|
{
|
|
static char digits[] = "0123456789abcdef";
|
|
|
|
BUFFER_BYTE(digits[(c&0xF0)>>4]);
|
|
BUFFER_BYTE(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)
|
|
BUFFER_BYTE(lastsent = c);
|
|
else {
|
|
switch (c &= 0377) {
|
|
case ZDLE:
|
|
BUFFER_BYTE(ZDLE);
|
|
BUFFER_BYTE (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:
|
|
BUFFER_BYTE(ZDLE);
|
|
c ^= 0100;
|
|
sendit:
|
|
BUFFER_BYTE(lastsent = c);
|
|
break;
|
|
default:
|
|
if (Zctlesc && ! (c & 0140)) {
|
|
BUFFER_BYTE(ZDLE);
|
|
c ^= 0100;
|
|
}
|
|
BUFFER_BYTE(lastsent = c);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/* Decode two lower case hex digits into an 8 bit byte value */
|
|
int zgethex(void)
|
|
{
|
|
register int c;
|
|
|
|
c = zgeth1();
|
|
return c;
|
|
}
|
|
|
|
|
|
|
|
int zgeth1(void)
|
|
{
|
|
register int c, n;
|
|
|
|
if ((c = noxrd7()) < 0)
|
|
return c;
|
|
n = c - '0';
|
|
if (n > 9)
|
|
n -= ('a' - ':');
|
|
if (n & ~0xF)
|
|
return TERROR;
|
|
if ((c = noxrd7()) < 0)
|
|
return c;
|
|
c -= '0';
|
|
if (c > 9)
|
|
c -= ('a' - ':');
|
|
if (c & ~0xF)
|
|
return TERROR;
|
|
c += (n<<4);
|
|
return c;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Read a byte, checking for ZMODEM escape encoding
|
|
* including CAN*5 which represents a quick abort
|
|
*/
|
|
int zdlread(void)
|
|
{
|
|
register int c;
|
|
|
|
again:
|
|
/* Quick check for non control characters */
|
|
if ((c = GETCHAR(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 = GETCHAR(Rxtimeout)) < 0)
|
|
return c;
|
|
if (c == CAN && (c = GETCHAR(Rxtimeout)) < 0)
|
|
return c;
|
|
if (c == CAN && (c = GETCHAR(Rxtimeout)) < 0)
|
|
return c;
|
|
if (c == CAN && (c = GETCHAR(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;
|
|
}
|
|
Syslog('+', "Zmodem: Bad escape sequence 0x%x", c);
|
|
return TERROR;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Read a character from the modem line with timeout.
|
|
* Eat parity, XON and XOFF characters.
|
|
*/
|
|
int noxrd7(void)
|
|
{
|
|
register int c;
|
|
|
|
for (;;) {
|
|
if ((c = GETCHAR(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(int pos)
|
|
{
|
|
Txhdr[ZP0] = pos;
|
|
Txhdr[ZP1] = pos>>8;
|
|
Txhdr[ZP2] = pos>>16;
|
|
Txhdr[ZP3] = pos>>24;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Recover a long integer from a header
|
|
*/
|
|
int rclhdr(register char *shdr)
|
|
{
|
|
register int l;
|
|
|
|
l = (shdr[ZP3] & 0377);
|
|
l = (l << 8) | (shdr[ZP2] & 0377);
|
|
l = (l << 8) | (shdr[ZP1] & 0377);
|
|
l = (l << 8) | (shdr[ZP0] & 0377);
|
|
return l;
|
|
}
|
|
|
|
/* End of zmmisc.c */
|