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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* gmime-rfc2047.c: implemention of RFC2047 */
/*
* Copyright (C) 1999 Bertrand Guiheneuf <Bertrand.Guiheneuf@inria.fr> .
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
/*
* Authors: Robert Brady <rwb197@ecs.soton.ac.uk>
*/
#include <stdio.h>
#include <ctype.h>
#include <unicode.h>
#include <string.h>
#include "gmime-rfc2047.h"
#define NOT_RANKED -1
/* This should be changed ASAP to use the base64 code Miguel comitted */
const char *base64_alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static unsigned char base64_rank[256];
static int base64_rank_table_built;
static void build_base64_rank_table (void);
static int
hexval (gchar c) {
if (isdigit (c)) return c-'0';
c = tolower (c);
return c - 'a' + 10;
}
static void
decode_quoted (const gchar *text, gchar *to)
{
while (*text) {
if (*text == '=') {
gchar a = hexval (text[1]);
gchar b = hexval (text[2]);
int c = (a << 4) + b;
*to = c;
to++;
text+=3;
} else if (*text == '_') {
*to = ' ';
to++;
text++;
} else {
*to = *text;
to++;
text++;
}
}
*to = 0;
}
static void
decode_base64 (const gchar *what, gchar *where)
{
unsigned short pattern = 0;
int bits = 0;
int delimiter = '=';
gchar x;
gchar *t = where;
int Q = 0;
while (*what != delimiter) {
x = base64_rank[(unsigned char)(*what++)];
if (x == NOT_RANKED)
continue;
pattern <<= 6;
pattern |= x;
bits += 6;
if (bits >= 8) {
x = (pattern >> (bits - 8)) & 0xff;
*t++ = x;
Q++;
bits -= 8;
}
}
*t = 0;
}
static void
build_base64_rank_table (void)
{
int i;
if (!base64_rank_table_built) {
for (i = 0; i < 256; i++)
base64_rank[i] = NOT_RANKED;
for (i = 0; i < 64; i++)
base64_rank[(int) base64_alphabet[i]] = i;
base64_rank_table_built = 1;
}
}
gchar
*gmime_rfc2047_decode (const gchar *data, const gchar *into_what)
{
gchar buffer[4096] /* FIXME : constant sized buffer */, *b = buffer;
build_base64_rank_table ();
while (*data) {
/* If we encounter an error we just break out of the loop and copy the rest
* of the text as-is */
if (*data=='=') {
data++;
if (*data=='?') {
gchar *charset, *encoding, *text, *end;
gchar dc[4096];
charset = data+1;
encoding = strchr(charset, '?');
if (!encoding) break;
encoding++;
text = strchr (encoding, '?');
if (!text) break;
text++;
end = strstr (text, "?=");
if (!end) break;
end++;
*(encoding-1)=0;
*(text-1)=0;
*(end-1)=0;
if (strcasecmp (encoding, "q") == 0) {
decode_quoted(text, dc);
} else if (strcasecmp (encoding, "b") == 0) {
decode_base64 (text, dc);
} else {
/* What to do here? */
break;
}
{
int f;
iconv_t i;
const gchar *d2 = dc;
int l = strlen (d2), l2 = 4000;
i = unicode_iconv_open (into_what, charset);
if (!i)
break;
unicode_iconv (i, &d2, &l, &b, &l2);
unicode_iconv_close (i);
data = end;
}
}
} else {
*b = *data;
b++;
}
data++;
}
while (*data) {
*b = *data;
b++;
data++;
}
*b = 0;
return g_strdup (buffer);
}
gchar
*rfc2047_encode (const gchar *string, const gchar *charset)
{
gchar buffer[4096] /* FIXME : constant sized buffer */;
gchar *b = buffer;
const gchar *s = string;
int not_ascii = 0, not_latin1 = 0;
while (*s) {
if (*s <= 20 || *s >= 0x7f || *s == '=') { not_ascii = 1; }
s++;
}
if (!not_ascii) {
b += sprintf (b, "%s", string);
}
else {
b += sprintf (b, "=?%s?Q?", charset);
s = string;
while (*s) {
if (*s == ' ') b += sprintf (b, "_");
else if (*s < 0x20 || *s >= 0x7f || *s == '=' || *s == '?' || *s == '_') {
b += sprintf (b, "=%2x", *s);
} else {
b += sprintf (b, "%c", *s);
}
s++;
}
b += sprintf (b, "?=");
}
*b = 0;
return g_strdup (buffer);
}
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