mdw@git.distorted.org.uk Git - ezmlm/blob - encodeQ.c

   1 /* $Id: encodeQ.c,v 1.2 1998/02/28 19:03:02 lindberg Exp $*/
   2 /* $Name: ezmlm-idx-040 $*/
   3
   4 #include "errtxt.h"
   5 #include "mime.h"
   6 #include "stralloc.h"
   7 #include "strerr.h"
   8
   9 static void die_nomem(fatal)
  10   char *fatal;
  11 {
  12   strerr_die2x(111,fatal,ERR_NOMEM);
  13 }
  14
  15 static char *hexchar = "0123456789ABCDEF";
  16
  17 void encodeQ(indata,n,outdata,fatal)
  18 char *indata;
  19 unsigned int n;
  20 stralloc *outdata;
  21 char *fatal;
  22
  23         /* converts any character with the high order bit set to */
  24         /* quoted printable. In: n chars of indata, out: stralloc outdata*/
  25
  26 {
  27   register char *cpout;
  28   register char ch;
  29   unsigned int i;
  30   char *cpin;
  31
  32   cpin = indata;
  33   i = 0;
  34         /* max 3 outchars per inchar  & 2 char newline per 72 chars */
  35   if (!stralloc_copys(outdata,"")) die_nomem(fatal);
  36   if (!stralloc_ready(outdata,n * 3 + n/36)) die_nomem(fatal);  /* worst case */
  37   cpout = outdata->s;
  38   while (n--) {
  39     ch = *cpin++;
  40     if (ch != ' ' && ch != '\n' && ch != '\t' &&
  41           (ch > 126 || ch < 33 || ch == 61)) {
  42       *(cpout++) = '=';
  43       *(cpout++) = hexchar[(ch >> 4) & 0xf];
  44       *(cpout++) = hexchar[ch & 0xf];
  45       i += 3;
  46     } else {
  47       if (ch == '\n')
  48         i = 0;
  49       *(cpout++) = ch;
  50     }
  51     if (i >= 72) {
  52       *(cpout++) = '=';
  53       *(cpout++) = '\n';
  54       i = 0;
  55     }
  56   }
  57   outdata->len = (unsigned int) (cpout - outdata->s);
  58 }