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/*
* Heirloom mailx - a mail user agent derived from Berkeley Mail.
*
* Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
*/
/*
* These base64 routines are derived from the metamail-2.7 sources which
* state the following copyright notice:
*
* Copyright (c) 1991 Bell Communications Research, Inc. (Bellcore)
*
* Permission to use, copy, modify, and distribute this material
* for any purpose and without fee is hereby granted, provided
* that the above copyright notice and this permission notice
* appear in all copies, and that the name of Bellcore not be
* used in advertising or publicity pertaining to this
* material without the specific, prior written permission
* of an authorized representative of Bellcore. BELLCORE
* MAKES NO REPRESENTATIONS ABOUT THE ACCURACY OR SUITABILITY
* OF THIS MATERIAL FOR ANY PURPOSE. IT IS PROVIDED "AS IS",
* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES.
*/
#ifndef lint
#ifdef DOSCCS
static char sccsid[] = "@(#)base64.c 2.14 (gritter) 4/21/06";
#endif
#endif /* not lint */
/*
* Mail -- a mail program
*
* base64 functions
*/
#include "rcv.h"
#include "extern.h"
static const char b64table[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const signed char b64index[] = {
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14,
15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
-1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
};
#define char64(c) ((c) < 0 ? -1 : b64index[(int)(c)])
static signed char *ctob64(unsigned char *p, int pad);
/*
* Convert three characters to base64.
*/
static signed char *
ctob64(unsigned char *p, int pad)
{
static signed char b64[4];
b64[0] = b64table[p[0] >> 2];
b64[1] = b64table[((p[0] & 0x3) << 4) | ((p[1] & 0xF0) >> 4)];
if (pad == 2) {
b64[1] = b64table[(p[0] & 0x3) << 4];
b64[2] = b64[3] = '=';
} else if (pad == 1) {
b64[2] = b64table[((p[1] & 0xF) << 2)];
b64[3] = '=';
} else {
b64[2] = b64table[((p[1] & 0xF) << 2) | ((p[2] & 0xC0) >> 6)];
b64[3] = b64table[p[2] & 0x3F];
}
return b64;
}
char *
strtob64(const char *p)
{
return memtob64(p, strlen(p));
}
char *
memtob64(const void *vp, size_t isz)
{
char q[3];
const char *p = vp;
signed char *h;
size_t c = 0;
int i, l = 0, sz = 0, pads;
char *rs = NULL;
if (isz == 0) {
rs = smalloc(1);
*rs = '\0';
return rs;
}
do {
for (pads = 2, i = 0; i <= 2; i++, pads--) {
q[i] = p[c++];
if (c == isz)
break;
}
h = ctob64((unsigned char *)q, pads);
if (l + 5 >= sz)
rs = srealloc(rs, sz = l + 100);
for (i = 0; i < 4; i++)
rs[l++] = h[i];
} while (c < isz);
rs[l] = '\0';
return rs;
}
/*
* Write to a file converting to base64. The input must be aligned
* e.g. at 972 character bounds.
*/
size_t
mime_write_tob64(struct str *in, FILE *fo, int is_header)
{
char *p, *upper, q[3];
signed char *h;
int i, l, pads;
size_t sz;
sz = 0;
upper = in->s + in->l;
for (p = in->s, l = 0; p < upper; ) {
for (pads = 2, i = 0; i <= 2; i++, pads--) {
q[i] = *p++;
if (p == upper)
break;
}
h = ctob64((unsigned char *)q, pads);
fwrite(h, sizeof(char), 4, fo);
sz += 4, l += 4;
if (l >= 71) {
putc('\n', fo), sz++;
l = 0;
}
}
if (l != 0 && !is_header) {
putc('\n', fo), sz++;
}
return sz;
}
/*
* Decode from base64.
*/
void
mime_fromb64(struct str *in, struct str *out, int is_text)
{
char *p, *q, *upper;
signed char c, d, e, f, g;
int done = 0, newline = 0;
out->s = smalloc(in->l * 3 / 4 + 2);
out->l = 0;
upper = in->s + in->l;
for (p = in->s, q = out->s; p < upper; ) {
while (c = *p++, whitechar(c));
if (p >= upper) break;
if (done) continue;
while (d = *p++, whitechar(d));
if (p >= upper) break;
while (e = *p++, whitechar(e));
if (p >= upper) break;
while (f = *p++, whitechar(f));
if (c == '=' || d == '=') {
done = 1;
continue;
}
c = char64(c);
d = char64(d);
g = ((c << 2) | ((d & 0x30) >> 4));
if (is_text) {
if (g == '\r') {
newline = 1;
} else if (g == '\n' && newline) {
q--;
out->l--;
newline = 0;
} else {
newline = 0;
}
}
*q++ = g;
out->l++;
if (e == '=') {
done = 1;
} else {
e = char64(e);
g = (((d & 0xF) << 4) | ((e & 0x3C) >> 2));
if (is_text) {
if (g == '\r') {
newline = 1;
} else if (g == '\n' && newline) {
q--;
out->l--;
newline = 0;
} else {
newline = 0;
}
}
*q++ = g;
out->l++;
if (f == '=') {
done = 1;
} else {
f = char64(f);
g = (((e & 0x03) << 6) | f);
if (is_text) {
if (g == '\r') {
newline = 1;
} else if (g == '\n' && newline) {
q--;
out->l--;
newline = 0;
} else {
newline = 0;
}
}
*q++ = g;
out->l++;
}
}
}
return;
}
/*
* Buffer the base64 input so mime_fromb64 gets always multiples of
* 4 characters.
* As we have only one buffer, this function is not reentrant.
*/
void
mime_fromb64_b(struct str *in, struct str *out, int is_text, FILE *f)
{
static signed char b[4];
static int n;
static FILE *f_b = (FILE *)-1;
signed char c;
int i;
struct str nin;
nin.s = smalloc(in->l + n);
if (n != 0 && f_b == f) {
for (nin.l = 0; nin.l < n; nin.l++)
nin.s[nin.l] = b[nin.l];
} else {
nin.l = 0;
n = 0;
}
for (i = 0; i <= in->l; i++) {
c = in->s[i];
if (char64(c) == -1 && c != '=')
continue;
b[n] = nin.s[nin.l++] = c;
if (n >= 3)
n = 0;
else
n++;
}
nin.l -= n;
mime_fromb64(&nin, out, is_text);
free(nin.s);
f_b = f;
}
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