static void decode_transfer_encoding(char *line, unsigned linesize)
{
char *ep;
switch (transfer_encoding) {
case TE_QP:
ep = line + strlen(line);
decode_q_segment(line, line, linesize, ep, 0);
break;
case TE_BASE64:
ep = line + strlen(line);
decode_b_segment(line, line, linesize, ep);
break;
case TE_DONTCARE:
break;
}
}
static void
add_header_to_string(struct string *str, unsigned char *header)
{
unsigned char *end;
while ((end = strstr((const char *)header, "=?")) != NULL) {
int encoding;
unsigned char *cp, *sp;
if (header != end) {
add_html_to_string(str, header, end - header);
header = end;
}
/* E.g.
* ep : "=?iso-2022-jp?B?GyR...?= foo"
* ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
*/
end += 2;
cp = strchr((const char *)end, '?');
if (!cp)
break;
for (sp = end; sp < cp; sp++)
/* charset */;
encoding = c_tolower(cp[1]);
if (!encoding || cp[2] != '?')
break;
cp += 3;
end = strstr((const char *)(cp + 3), "?=");
if (!end)
break;
if (encoding == 'b')
decode_b_segment(str, cp, end);
else if (encoding == 'q')
decode_q_segment(str, cp, end);
else
break;
header = end + 2;
}
add_html_to_string(str, header, strlen(header));
}
static void decode_transfer_encoding(struct strbuf *line)
{
struct strbuf *ret;
switch (transfer_encoding) {
case TE_QP:
ret = decode_q_segment(line, 0);
break;
case TE_BASE64:
ret = decode_b_segment(line);
break;
case TE_DONTCARE:
default:
return;
}
strbuf_reset(line);
strbuf_addbuf(line, ret);
strbuf_release(ret);
free(ret);
}
static int decode_header_bq(struct strbuf *it)
{
char *in, *ep, *cp;
struct strbuf outbuf = STRBUF_INIT, *dec;
struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
int rfc2047 = 0;
in = it->buf;
while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
int encoding;
strbuf_reset(&charset_q);
strbuf_reset(&piecebuf);
rfc2047 = 1;
if (in != ep) {
/*
* We are about to process an encoded-word
* that begins at ep, but there is something
* before the encoded word.
*/
char *scan;
for (scan = in; scan < ep; scan++)
if (!isspace(*scan))
break;
if (scan != ep || in == it->buf) {
/*
* We should not lose that "something",
* unless we have just processed an
* encoded-word, and there is only LWS
* before the one we are about to process.
*/
strbuf_add(&outbuf, in, ep - in);
}
}
/* E.g.
* ep : "=?iso-2022-jp?B?GyR...?= foo"
* ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
*/
ep += 2;
if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
goto decode_header_bq_out;
if (cp + 3 - it->buf > it->len)
goto decode_header_bq_out;
strbuf_add(&charset_q, ep, cp - ep);
encoding = cp[1];
if (!encoding || cp[2] != '?')
goto decode_header_bq_out;
ep = strstr(cp + 3, "?=");
if (!ep)
goto decode_header_bq_out;
strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
switch (tolower(encoding)) {
default:
goto decode_header_bq_out;
case 'b':
dec = decode_b_segment(&piecebuf);
break;
case 'q':
dec = decode_q_segment(&piecebuf, 1);
break;
}
if (metainfo_charset)
convert_to_utf8(dec, charset_q.buf);
strbuf_addbuf(&outbuf, dec);
strbuf_release(dec);
free(dec);
in = ep + 2;
}
strbuf_addstr(&outbuf, in);
strbuf_reset(it);
strbuf_addbuf(it, &outbuf);
decode_header_bq_out:
strbuf_release(&outbuf);
strbuf_release(&charset_q);
strbuf_release(&piecebuf);
return rfc2047;
}
static int decode_header_bq(char *it, unsigned itsize)
{
char *in, *out, *ep, *cp, *sp;
char outbuf[1000];
int rfc2047 = 0;
in = it;
out = outbuf;
while ((ep = strstr(in, "=?")) != NULL) {
int sz, encoding;
char charset_q[256], piecebuf[256];
rfc2047 = 1;
if (in != ep) {
sz = ep - in;
memcpy(out, in, sz);
out += sz;
in += sz;
}
/* E.g.
* ep : "=?iso-2022-jp?B?GyR...?= foo"
* ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
*/
ep += 2;
cp = strchr(ep, '?');
if (!cp)
return rfc2047; /* no munging */
for (sp = ep; sp < cp; sp++)
charset_q[sp - ep] = tolower(*sp);
charset_q[cp - ep] = 0;
encoding = cp[1];
if (!encoding || cp[2] != '?')
return rfc2047; /* no munging */
ep = strstr(cp + 3, "?=");
if (!ep)
return rfc2047; /* no munging */
switch (tolower(encoding)) {
default:
return rfc2047; /* no munging */
case 'b':
sz = decode_b_segment(cp + 3, piecebuf, sizeof(piecebuf), ep);
break;
case 'q':
sz = decode_q_segment(cp + 3, piecebuf, sizeof(piecebuf), ep, 1);
break;
}
if (sz < 0)
return rfc2047;
if (metainfo_charset)
convert_to_utf8(piecebuf, sizeof(piecebuf), charset_q);
sz = strlen(piecebuf);
if (outbuf + sizeof(outbuf) <= out + sz)
return rfc2047; /* no munging */
strcpy(out, piecebuf);
out += sz;
in = ep + 2;
}
strcpy(out, in);
strlcpy(it, outbuf, itsize);
return rfc2047;
}
