uuencode.c

   1 /* $OpenBSD: uuencode.c,v 1.26 2010/08/31 11:54:45 djm Exp $ */
   2 /*
   3  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "includes.h"
  27
  28 #include <sys/types.h>
  29 #include <netinet/in.h>
  30 #include <resolv.h>
  31 #include <stdio.h>
  32
  33 #include "xmalloc.h"
  34 #include "uuencode.h"
  35
  36 /*
  37  * Encode binary 'src' of length 'srclength', writing base64-encoded text
  38  * to 'target' of size 'targsize'. Will always nul-terminate 'target'.
  39  * Returns the number of bytes stored in 'target' or -1 on error (inc.
  40  * 'targsize' too small).
  41  */
  42 int
  43 uuencode(const u_char *src, u_int srclength,
  44     char *target, size_t targsize)
  45 {
  46         return __b64_ntop(src, srclength, target, targsize);
  47 }
  48
  49 /*
  50  * Decode base64-encoded 'src' into buffer 'target' of 'targsize' bytes.
  51  * Will skip leading and trailing whitespace. Returns the number of bytes
  52  * stored in 'target' or -1 on error (inc. targsize too small).
  53  */
  54 int
  55 uudecode(const char *src, u_char *target, size_t targsize)
  56 {
  57         int len;
  58         char *encoded, *p;
  59
  60         /* copy the 'readonly' source */
  61         encoded = xstrdup(src);
  62         /* skip whitespace and data */
  63         for (p = encoded; *p == ' ' || *p == '\t'; p++)
  64                 ;
  65         for (; *p != '\0' && *p != ' ' && *p != '\t'; p++)
  66                 ;
  67         /* and remove trailing whitespace because __b64_pton needs this */
  68         *p = '\0';
  69         len = __b64_pton(encoded, target, targsize);
  70         xfree(encoded);
  71         return len;
  72 }
  73
  74 void
  75 dump_base64(FILE *fp, const u_char *data, u_int len)
  76 {
  77         char *buf;
  78         int i, n;
  79
  80         if (len > 65536) {
  81                 fprintf(fp, "dump_base64: len > 65536\n");
  82                 return;
  83         }
  84         buf = xmalloc(2*len);
  85         n = uuencode(data, len, buf, 2*len);
  86         for (i = 0; i < n; i++) {
  87                 fprintf(fp, "%c", buf[i]);
  88                 if (i % 70 == 69)
  89                         fprintf(fp, "\n");
  90         }
  91         if (i % 70 != 69)
  92                 fprintf(fp, "\n");
  93         xfree(buf);
  94 }