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/*
* convert from binary data (e.g. key) to text form
* Copyright (C) 2000 Henry Spencer.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/lgpl.txt>.
*
* This library 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 Library General Public
* License for more details.
*
* RCSID $Id: datatot.c,v 1.1 2004/03/15 20:35:26 as Exp $
*/
#include "internal.h"
#include "freeswan.h"
static void convert(const char *src, size_t nreal, int format, char *out);
/*
- datatot - convert data bytes to text
*/
size_t /* true length (with NUL) for success */
datatot(src, srclen, format, dst, dstlen)
const char *src;
size_t srclen;
int format; /* character indicating what format */
char *dst; /* need not be valid if dstlen is 0 */
size_t dstlen;
{
size_t inblocksize; /* process this many bytes at a time */
size_t outblocksize; /* producing this many */
size_t breakevery; /* add a _ every this many (0 means don't) */
size_t sincebreak; /* output bytes since last _ */
char breakchar; /* character used to break between groups */
char inblock[10]; /* enough for any format */
char outblock[10]; /* enough for any format */
char fake[1]; /* fake output area for dstlen == 0 */
size_t needed; /* return value */
char *stop; /* where the terminating NUL will go */
size_t ntodo; /* remaining input */
size_t nreal;
char *out;
char *prefix;
breakevery = 0;
breakchar = '_';
switch (format) {
case 0:
case 'h':
format = 'x';
breakevery = 8;
/* FALLTHROUGH */
case 'x':
inblocksize = 1;
outblocksize = 2;
prefix = "0x";
break;
case ':':
format = 'x';
breakevery = 2;
breakchar = ':';
/* FALLTHROUGH */
case 16:
inblocksize = 1;
outblocksize = 2;
prefix = "";
format = 'x';
break;
case 's':
inblocksize = 3;
outblocksize = 4;
prefix = "0s";
break;
case 64: /* beware, equals ' ' */
inblocksize = 3;
outblocksize = 4;
prefix = "";
format = 's';
break;
default:
return 0;
break;
}
assert(inblocksize < sizeof(inblock));
assert(outblocksize < sizeof(outblock));
assert(breakevery % outblocksize == 0);
if (srclen == 0)
return 0;
ntodo = srclen;
if (dstlen == 0) { /* dispose of awkward special case */
dst = fake;
dstlen = 1;
}
stop = dst + dstlen - 1;
nreal = strlen(prefix);
needed = nreal; /* for starters */
if (dstlen <= nreal) { /* prefix won't fit */
strncpy(dst, prefix, dstlen - 1);
dst += dstlen - 1;
} else {
strcpy(dst, prefix);
dst += nreal;
}
assert(dst <= stop);
sincebreak = 0;
while (ntodo > 0) {
if (ntodo < inblocksize) { /* incomplete input */
memset(inblock, 0, sizeof(inblock));
memcpy(inblock, src, ntodo);
src = inblock;
nreal = ntodo;
ntodo = inblocksize;
} else
nreal = inblocksize;
out = (outblocksize > stop - dst) ? outblock : dst;
convert(src, nreal, format, out);
needed += outblocksize;
sincebreak += outblocksize;
if (dst < stop) {
if (out != dst) {
assert(outblocksize > stop - dst);
memcpy(dst, out, stop - dst);
dst = stop;
} else
dst += outblocksize;
}
src += inblocksize;
ntodo -= inblocksize;
if (breakevery != 0 && sincebreak >= breakevery && ntodo > 0) {
if (dst < stop)
*dst++ = breakchar;
needed++;
sincebreak = 0;
}
}
assert(dst <= stop);
*dst++ = '\0';
needed++;
return needed;
}
/*
- convert - convert one input block to one output block
*/
static void
convert(src, nreal, format, out)
const char *src;
size_t nreal; /* how much of the input block is real */
int format;
char *out;
{
static char hex[] = "0123456789abcdef";
static char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
unsigned char c;
unsigned char c1, c2, c3;
assert(nreal > 0);
switch (format) {
case 'x':
assert(nreal == 1);
c = (unsigned char)*src;
*out++ = hex[c >> 4];
*out++ = hex[c & 0xf];
break;
case 's':
c1 = (unsigned char)*src++;
c2 = (unsigned char)*src++;
c3 = (unsigned char)*src++;
*out++ = base64[c1 >> 2]; /* top 6 bits of c1 */
c = (c1 & 0x3) << 4; /* bottom 2 of c1... */
c |= c2 >> 4; /* ...top 4 of c2 */
*out++ = base64[c];
if (nreal == 1)
*out++ = '=';
else {
c = (c2 & 0xf) << 2; /* bottom 4 of c2... */
c |= c3 >> 6; /* ...top 2 of c3 */
*out++ = base64[c];
}
if (nreal <= 2)
*out++ = '=';
else
*out++ = base64[c3 & 0x3f]; /* bottom 6 of c3 */
break;
default:
assert(nreal == 0); /* unknown format */
break;
}
}
/*
- datatoa - convert data to ASCII
* backward-compatibility synonym for datatot
*/
size_t /* true length (with NUL) for success */
datatoa(src, srclen, format, dst, dstlen)
const char *src;
size_t srclen;
int format; /* character indicating what format */
char *dst; /* need not be valid if dstlen is 0 */
size_t dstlen;
{
return datatot(src, srclen, format, dst, dstlen);
}
/*
- bytestoa - convert data bytes to ASCII
* backward-compatibility synonym for datatot
*/
size_t /* true length (with NUL) for success */
bytestoa(src, srclen, format, dst, dstlen)
const char *src;
size_t srclen;
int format; /* character indicating what format */
char *dst; /* need not be valid if dstlen is 0 */
size_t dstlen;
{
return datatot(src, srclen, format, dst, dstlen);
}
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