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RBSB.C
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1993-07-16
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448 lines
/****************************************************************************
* Language : Turbo C 2.0 *
* Logfile : rbsb.c *
* Project : Comms library. *
* Date : 25 Jan 90 *
* Revision : 1.1 GT PC version. *
* 25 Oct 92 : 1.2 GT KA9Q mods. *
* 30 Jan 93 : 1.3 GT Fix KA9Q background operation. *
* 20 Feb 93 : 1.4 GT Buffer sends locally. *
* 20 Feb 93 : 1.5 GT Fix return value in send_zbuf (). *
* 21 Feb 93 : 1.6 GT Allocate send buffer from heap. *
* 08 May 93 : 1.7 GT Fix warnings. *
*****************************************************************************
* Purpose : Terminal mode and CRC code. *
*****************************************************************************
* : This module is based on the equivalent module in the *
* : 31 Aug 87 version of rz/sz. *
* $Id: rbsb.c 1.6 93/07/16 11:49:32 ROOT_DOS Exp $
****************************************************************************/
/*
*
* -rev 04-16-87
* This file contains Unix specific code for setting terminal modes,
* very little is specific to ZMODEM or YMODEM per se (that code is in
* sz.c and rz.c). The CRC-16 routines used by XMODEM, YMODEM, and ZMODEM
* are also in this file, a fast table driven macro version
*
* This file is #included so the main file can set parameters such as HOWMANY.
* See the main files (rz.c/sz.c) for compile instructions.
*/
#include <stdio.h>
#include <string.h>
#include "rbsb.h"
#include "session.h"
#include "socket.h"
#include "usock.h"
#include "mbuf.h"
#include "proc.h"
#include "global.h"
static int send_zbuf (void);
#define SENDSIZE (BUFSIZ * 4)
int _z_socket; /* socket */
#if 0
static unsigned char sbuf[SENDSIZE]; /* send buffer */
#endif
static unsigned char *sbuf = 0; /* -> send buffer */
static size_t buflen = 0; /* send buffer size */
static unsigned char *bufptr; /* -> send buffer */
/****************************************************************************
* sndbrk *
* Send break to the modem. *
****************************************************************************/
void _sendbrk (void)
{
/* does nothing */
} /* void _sendbrk (void) */
/****************************************************************************
* _rdchk *
* Returns nz if something to read from remote. *
****************************************************************************/
int _rdchk (void)
{
int rc;
rc = socklen (_z_socket, 0);
if (rc < 0)
rc = 0;
if (rc == 0)
pwait (0); /* let others run */
#if 0
usflush (_z_socket);
#endif
return (rc);
} /* int _rdchk (void) */
/****************************************************************************
* _send *
* Send some data to the remote. *
****************************************************************************/
int _send (unsigned char *buf, int len)
{
#if 0
int rc; /* result code */
int count; /* byte counter */
int oldmode; /* old socket mode */
int oldflush; /* old flush character */
#endif
if (sbuf == 0)
{
sbuf = mallocw (SENDSIZE);
bufptr = sbuf;
buflen = 0;
}
if (len + buflen > SENDSIZE)
{
if (send_zbuf () < 0)
return (0);
}
(void) memcpy (bufptr, buf, len);
bufptr += len;
buflen += len;
return (len);
#if 0
count = 0;
oldmode = sockmode (_z_socket, SOCK_BINARY);
oldflush = setflush (_z_socket, -1);
while (len > 0)
{
rc = send (_z_socket, buf, len, 0);
if (rc < 0)
break;
len -= rc;
buf += rc;
count += rc;
if (count != len)
pwait (0);
}
#if 0
if (rc >= 0)
usflush (_z_socket);
#endif
(void) setflush (_z_socket, oldflush);
(void) sockmode (_z_socket, oldmode);
return (count);
#endif
} /* int _send (unsigned char *buf, int len) */
/****************************************************************************
* _flush *
* Flush output. *
****************************************************************************/
void _flush (void)
{
if (send_zbuf () > 0)
usflush (_z_socket);
} /* void _flush (void) */
/****************************************************************************
* send_zbuf *
* Sends the send buffer to the remote. *
****************************************************************************/
static int send_zbuf (void)
{
int rc; /* return value */
#if 0
int count; /* byte counter */
#endif
int oldmode; /* old socket mode */
int oldflush; /* old flush character */
struct mbuf *bp; /* -> mbuf */
if (sbuf == 0)
return (0);
oldmode = sockmode (_z_socket, SOCK_BINARY);
oldflush = setflush (_z_socket, -1);
bp = ambufw (SENDSIZE);
bp->cnt = buflen;
(void) memcpy (bp->data, sbuf, buflen);
#if 0
_vfile ("Calling send_mbuf (), count = %d, sbuf = %p\n", bp->cnt, sbuf);
#endif
rc = send_mbuf (_z_socket, bp, 0, NULLCHAR, 0);
#if 0
_vfile ("Back from send_mbuf (), rc = %d\n", rc);
#endif
if (rc < 0)
rc = 0;
else
{
bufptr = sbuf;
buflen = 0;
}
(void) setflush (_z_socket, oldflush);
(void) sockmode (_z_socket, oldmode);
return (rc);
} /* static int send_zbuf (void) */
/****************************************************************************
* _receive *
* Receive some data from the remote. *
****************************************************************************/
int _receive (unsigned char *buf, int len)
{
int rc;
int oldmode; /* old socket mode */
int oldflush; /* old flush character */
#if 0
static char rcv_buf[1024]; /* receive buffer */
static char *p; /* -> receive buffer */
static unsigned count = 0; /* number of bytes in receive buf */
struct mbuf *bp; /* -> mbuf */
#endif
oldmode = sockmode (_z_socket, SOCK_BINARY);
oldflush = setflush (_z_socket, -1);
rc = recv (_z_socket, (char *) buf, len, 0);
(void) setflush (_z_socket, oldflush);
(void) sockmode (_z_socket, oldmode);
if (rc < 0)
rc = 0;
#if 0
/* Do we have any data? */
if (count == 0)
{
oldmode = sockmode (_z_socket, SOCK_BINARY);
oldflush = setflush (_z_socket, -1);
rc = recv_mbuf (_z_socket, &bp, 0, NULLCHAR, 0);
if (rc == -1)
count = -1;
(void) setflush (_z_socket, oldflush);
(void) sockmode (_z_socket, oldmode);
if (rc <= 0)
{
count = 0;
return (0);
}
count = dqdata (bp, rcv_buf, sizeof (rcv_buf));
p = rcv_buf;
}
if (count >= len)
{
(void) memcpy (buf, p, len);
count -= len;
p += len;
return (len);
}
/* Can't give all that was asked for. */
(void) memcpy (buf, p, count);
rc = count;
count = 0;
#endif
return (rc);
} /* int _receive (unsigned char *buf, int len) */
/* _crctab calculated by Mark G. Mendel, Network Systems Corporation */
unsigned short _crctab[256] =
{
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};
/*
* updcrc macro derived from article Copyright (C) 1986 Stephen Satchell.
* NOTE: First srgument must be in range 0 to 255.
* Second argument is referenced twice.
*
* Programmers may incorporate any or all code into their programs,
* giving proper credit within the source. Publication of the
* source routines is permitted so long as proper credit is given
* to Stephen Satchell, Satchell Evaluations and Chuck Forsberg,
* Omen Technology.
*/
#if 0 /* defined in rbsb.h */
#define updcrc(cp, crc) (_crctab[((crc >> 8) & 255)] ^ (crc << 8) ^ cp)
#endif
/*
* Copyright (C) 1986 Gary S. Brown. You may use this program, or
* code or tables extracted from it, as desired without restriction.
*/
/* First, the polynomial itself and its table of feedback terms. The */
/* polynomial is */
/* X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0 */
/* Note that we take it "backwards" and put the highest-order term in */
/* the lowest-order bit. The X^32 term is "implied"; the LSB is the */
/* X^31 term, etc. The X^0 term (usually shown as "+1") results in */
/* the MSB being 1. */
/* Note that the usual hardware shift register implementation, which */
/* is what we're using (we're merely optimizing it by doing eight-bit */
/* chunks at a time) shifts bits into the lowest-order term. In our */
/* implementation, that means shifting towards the right. Why do we */
/* do it this way? Because the calculated CRC must be transmitted in */
/* order from highest-order term to lowest-order term. UARTs transmit */
/* characters in order from LSB to MSB. By storing the CRC this way, */
/* we hand it to the UART in the order low-byte to high-byte; the UART */
/* sends each low-bit to hight-bit; and the result is transmission bit */
/* by bit from highest- to lowest-order term without requiring any bit */
/* shuffling on our part. Reception works similarly. */
/* The feedback terms table consists of 256, 32-bit entries. Notes: */
/* */
/* The table can be generated at runtime if desired; code to do so */
/* is shown later. It might not be obvious, but the feedback */
/* terms simply represent the results of eight shift/xor opera- */
/* tions for all combinations of data and CRC register values. */
/* */
/* The values must be right-shifted by eight bits by the "updcrc" */
/* logic; the shift must be unsigned (bring in zeroes). On some */
/* hardware you could probably optimize the shift in assembler by */
/* using byte-swap instructions. */
unsigned long far _cr3tab[] =
{ /* CRC polynomial 0xedb88320 */
0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL,
0x076dc419L, 0x706af48fL, 0xe963a535L, 0x9e6495a3L,
0x0edb8832L, 0x79dcb8a4L, 0xe0d5e91eL, 0x97d2d988L,
0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, 0x90bf1d91L,
0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L,
0x136c9856L, 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL,
0x14015c4fL, 0x63066cd9L, 0xfa0f3d63L, 0x8d080df5L,
0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, 0xa2677172L,
0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L,
0x32d86ce3L, 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L,
0x26d930acL, 0x51de003aL, 0xc8d75180L, 0xbfd06116L,
0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, 0xb8bda50fL,
0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL,
0x76dc4190L, 0x01db7106L, 0x98d220bcL, 0xefd5102aL,
0x71b18589L, 0x06b6b51fL, 0x9fbfe4a5L, 0xe8b8d433L,
0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, 0xe10e9818L,
0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL,
0x6c0695edL, 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L,
0x65b0d9c6L, 0x12b7e950L, 0x8bbeb8eaL, 0xfcb9887cL,
0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, 0xfbd44c65L,
0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL,
0x4369e96aL, 0x346ed9fcL, 0xad678846L, 0xda60b8d0L,
0x44042d73L, 0x33031de5L, 0xaa0a4c5fL, 0xdd0d7cc9L,
0x5005713cL, 0x270241aaL, 0xbe0b1010L, 0xc90c2086L,
0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L,
0x59b33d17L, 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL,
0xedb88320L, 0x9abfb3b6L, 0x03b6e20cL, 0x74b1d29aL,
0xead54739L, 0x9dd277afL, 0x04db2615L, 0x73dc1683L,
0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L,
0xf00f9344L, 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL,
0xf762575dL, 0x806567cbL, 0x196c3671L, 0x6e6b06e7L,
0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, 0x67dd4accL,
0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L,
0xd1bb67f1L, 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL,
0xd80d2bdaL, 0xaf0a1b4cL, 0x36034af6L, 0x41047a60L,
0xdf60efc3L, 0xa867df55L, 0x316e8eefL, 0x4669be79L,
0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL,
0xc5ba3bbeL, 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L,
0xc2d7ffa7L, 0xb5d0cf31L, 0x2cd99e8bL, 0x5bdeae1dL,
0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, 0x026d930aL,
0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L,
0x92d28e9bL, 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L,
0x86d3d2d4L, 0xf1d4e242L, 0x68ddb3f8L, 0x1fda836eL,
0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, 0x18b74777L,
0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L,
0xa00ae278L, 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L,
0xa7672661L, 0xd06016f7L, 0x4969474dL, 0x3e6e77dbL,
0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, 0x37d83bf0L,
0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L,
0xbad03605L, 0xcdd70693L, 0x54de5729L, 0x23d967bfL,
0xb3667a2eL, 0xc4614ab8L, 0x5d681b02L, 0x2a6f2b94L,
0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, 0x2d02ef8dL
};
#if 0 /* defined in rbsb.h */
#ifdef NFGM
long UPDC32 (int b, long c)
{
return (_cr3tab[((int)c ^ b) & 0xff] ^ ((c >> 8) & 0x00FFFFFF));
} /* long UPDC32 (int b, long c) */
#else
#define UPDC32(b, c) (_cr3tab[((int)c ^ b) & 0xff] ^ ((c >> 8) & 0x00FFFFFF))
#endif
#endif
/* End of rbsb.c */