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/* This file is part of GNU Dico.
Copyright (C) 2008-2024 Sergey Poznyakoff
GNU Dico 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 3, or (at your option)
any later version.
GNU Dico 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 GNU Dico. If not, see <http://www.gnu.org/licenses/>. */
#include <dicod.h>
off_t total_bytes_out;
#define OSTREAM_INITIALIZED 0x01
#define OSTREAM_DESTROY_TRANSPORT 0x02
#define OSTREAM_NEWLINE 0x04
struct ostream {
dico_stream_t transport;
off_t nout;
int flags;
dico_assoc_list_t headers;
};
static dico_stream_t
content_type_transport(char const *content_type, dico_stream_t transport)
{
size_t len;
len = strcspn(content_type, "/");
if (len == 4 && strncasecmp(content_type, "text", len) == 0) {
if (content_type[len] == 0)
return dico_linetrim_stream(transport, 1024, 1);
else {
content_type += len + 1;
len = strcspn(content_type, ";");
if (len == 5 && strncasecmp(content_type, "plain", len) == 0)
return dico_linetrim_stream(transport, 1024, 1);
}
}
return NULL;
}
static int
print_headers(struct ostream *ostr)
{
int rc = 0;
if (ostr->headers) {
dico_iterator_t itr;
struct dico_assoc *p;
itr = dico_assoc_iterator(ostr->headers);
for (p = dico_iterator_first(itr); p; p = dico_iterator_next(itr)) {
dico_stream_write(ostr->transport, p->key, strlen(p->key));
dico_stream_write(ostr->transport, ": ", 2);
dico_stream_write(ostr->transport, p->value, strlen(p->value));
dico_stream_write(ostr->transport, "\n", 1);
}
dico_iterator_destroy(&itr);
}
rc = dico_stream_write(ostr->transport, "\n", 1);
if (rc == 0) {
const char *enc;
dico_stream_t str;
if ((enc = dico_assoc_find(ostr->headers,
CONTENT_TRANSFER_ENCODING_HEADER))
&& strcmp(enc, "8bit")) {
str = dico_codec_stream_create(enc, FILTER_ENCODE,
ostr->transport);
} else if ((enc = dico_assoc_find(ostr->headers,
CONTENT_TYPE_HEADER)) != NULL)
str = content_type_transport(enc, ostr->transport);
else
str = dico_linetrim_stream(ostr->transport, 1024, 1);
if (str) {
ostr->transport = str;
ostr->flags |= OSTREAM_DESTROY_TRANSPORT;
}
}
return rc;
}
static int
ostream_write(void *data, const char *buf, size_t size, size_t *pret)
{
struct ostream *ostr = data;
if (!(ostr->flags & OSTREAM_INITIALIZED)) {
if (option_mime && print_headers(ostr))
return dico_stream_last_error(ostr->transport);
ostr->flags |= OSTREAM_INITIALIZED;
}
if (ostr->flags & OSTREAM_NEWLINE) {
ostr->flags &= ~OSTREAM_NEWLINE;
if (buf[0] == '.' && dico_stream_write(ostr->transport, ".", 1))
return dico_stream_last_error(ostr->transport);
}
if (buf[size-1] == '\n')
ostr->flags |= OSTREAM_NEWLINE;
*pret = size;
return dico_stream_write(ostr->transport, buf, size);
}
static int
ostream_flush(void *data)
{
struct ostream *ostr = data;
return dico_stream_flush(ostr->transport);
}
static int
ostream_destroy(void *data)
{
struct ostream *ostr = data;
if (ostr->flags & OSTREAM_DESTROY_TRANSPORT)
dico_stream_destroy(&ostr->transport);
free(data);
return 0;
}
static int
ostream_ioctl(void *data, int code, void *call_data)
{
struct ostream *ostr = data;
switch (code) {
case DICO_IOCTL_GET_TRANSPORT:
*(dico_stream_t*)call_data = ostr->transport;
break;
case DICO_IOCTL_SET_TRANSPORT:
ostr->transport = call_data;
break;
case DICO_IOCTL_BYTES_OUT:
dico_stream_flush(ostr->transport);
*(off_t*)call_data = dico_stream_bytes_out(ostr->transport) -
ostr->nout;
break;
default:
errno = EINVAL;
return -1;
}
return 0;
}
dico_stream_t
dicod_ostream_create(dico_stream_t str, dico_assoc_list_t headers)
{
struct ostream *ostr = xmalloc(sizeof(*ostr));
dico_stream_t stream;
if (dico_stream_create(&stream, DICO_STREAM_WRITE, ostr))
xalloc_die();
ostr->transport = str;
ostr->nout = dico_stream_bytes_out(str);
ostr->flags = 0;
ostr->headers = headers;
dico_stream_set_write(stream, ostream_write);
dico_stream_set_flush(stream, ostream_flush);
dico_stream_set_destroy(stream, ostream_destroy);
dico_stream_set_ioctl(stream, ostream_ioctl);
dico_stream_set_buffer(stream, dico_buffer_line, 1024);
return stream;
}
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