+++ /dev/null
-/* -*-c-*-
- *
- * $Id: tx.c,v 1.3 1998/01/12 16:46:31 mdw Exp $
- *
- * Transfer for keys and other large integers
- *
- * (c) 1998 Mark Wooding
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of `become'
- *
- * `Become' is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * `Become' is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with `become'; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: tx.c,v $
- * Revision 1.3 1998/01/12 16:46:31 mdw
- * Fix copyright date.
- *
- * Revision 1.2 1997/08/04 10:24:25 mdw
- * Sources placed under CVS control.
- *
- * Revision 1.1 1997/07/21 13:47:43 mdw
- * Initial revision
- *
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-/* --- ANSI headers --- */
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-/* --- Local headers --- */
-
-#include "config.h"
-#include "tx.h"
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @tx_getBits@ --- *
- *
- * Arguments: @unsigned char *k@ = pointer to key array to unpack into
- * @size_t sz@ = number of bits to read (elements in array)
- * @FILE *fp@ = stream to read from
- *
- * Returns: ---
- *
- * Use: Reads a number of bits into an array. The least significant
- * bits of the final word are cleared to zero.
- */
-
-void tx_getBits(unsigned char *k, size_t sz, FILE *fp)
-{
- int i = 0;
- unsigned char a = 0;
- unsigned int ch;
- size_t wsz = (size_t)((sz + 7ul) & ~7ul);
- int t;
-
- while ((t = getc(fp)) != EOF) {
-
- /* --- Allow separators for readbility --- */
-
- if (t == '-')
- continue;
-
- /* --- Standard converting-from-hex-digit code --- *
- *
- * Assumes that 'a'--'f' and 'A'--'F' are contiguous and in order, in
- * addition to the guarantee that '0'--'9' are like this. The assumption
- * is true in ASCII (and character sets based thereon) and EBCDIC.
- */
-
- ch = (unsigned)t;
- ch -= '0';
- if (ch > 9) ch -= 'A' - '0' - 10;
- if (ch > 15) ch -= 'a' - 'A';
- if (ch > 15) break;
-
- /* --- Accumulate and maybe store --- */
-
- a = (a << 4) | ch;
- i++;
- sz -= 4, wsz -= 4;
- if ((i & 1) == 0)
- *k++ = a, a = 0;
- if (!sz)
- break;
- }
-
- /* --- Pad the rest out with zeros --- */
-
- while (wsz) {
- a <<= 4;
- i++;
- wsz -= 4;
- if ((i & 1) == 0)
- *k++ = a, a = 0;
- }
-}
-
-/* --- @tx_putBits@ --- *
- *
- * Arguments: @unsigned char *k@ = pointer to key block
- * @size_t sz@ = number of bits to write
- * @FILE *fp@ = pointer to stream to write on
- *
- * Returns: ---
- *
- * Use: Complements @tx_getBits@ above. Writes a number of bits
- * to a file in an easy-to-read and transportable format (hex!)
- */
-
-void tx_putBits(unsigned char *k, size_t sz, FILE *fp)
-{
- const static char hex[16] = "0123456789abcdef";
- size_t dash;
- size_t d;
- unsigned char i;
-
- /* --- Don't do anything unless we have to --- */
-
- if (!sz)
- return;
-
- /* --- Now decide where to `dash' the output --- */
-
- if (sz % 32 == 0)
- dash = 4;
- else if (sz % 40 == 0)
- dash = 5;
- else
- dash = 0;
-
- /* --- Start writing values out --- */
-
- d = dash;
-
- for (;;) {
-
- /* --- Write next byte out --- */
-
- i = *k++;
- putc(hex[(i >> 4) & 0x0fu], fp);
- putc(hex[(i >> 0) & 0x0fu], fp);
-
- /* --- If done, stop now --- */
-
- if (sz -= 8, sz == 0)
- break;
-
- /* --- If need a dash, print one --- */
-
- if (!--d) {
- putc('-', fp);
- d = dash;
- }
- }
-
- /* --- Print the final newline --- */
-
- fputc('\n', fp);
-}
-
-/*----- That's all, folks -------------------------------------------------*/
~mdw / become / blobdiff