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/*
* Author Jerry Lundström <jerry@dns-oarc.net>
* Copyright (c) 2019, OARC, Inc.
* All rights reserved.
*
* This file is part of the dnswire library.
*
* dnswire library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* dnswire 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with dnswire library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <dnswire/dnswire.h>
#include <dnswire/encoder.h>
#include <dnswire/decoder.h>
#include <stdlib.h>
#ifndef __dnswire_h_writer
#define __dnswire_h_writer 1
enum dnswire_writer_state {
dnswire_writer_encoding_ready = 0,
dnswire_writer_writing_ready = 1,
dnswire_writer_reading_accept = 2,
dnswire_writer_decoding_accept = 3,
dnswire_writer_encoding = 4,
dnswire_writer_writing = 5,
dnswire_writer_stopping = 6,
dnswire_writer_encoding_stop = 7,
dnswire_writer_writing_stop = 8,
dnswire_writer_reading_finish = 9,
dnswire_writer_decoding_finish = 10,
dnswire_writer_done = 11,
};
extern const char* const dnswire_writer_state_string[];
/*
* Attributes:
* - size: The current size of the buffer
* - inc: How much the buffer will be increased by if more spare is needed
* - max: The maximum size the buffer is allowed to have
* - at: Where in the buffer we are encoding to (end of data)
* - left: How much data that is still left in the buffer before `at`
*/
struct dnswire_writer {
enum dnswire_writer_state state;
struct dnswire_encoder encoder;
uint8_t* buf;
size_t size, inc, max, at, left, popped;
struct dnswire_decoder decoder;
uint8_t* read_buf;
size_t read_size, read_inc, read_max, read_at, read_left, read_pushed;
bool bidirectional;
};
enum dnswire_result dnswire_writer_init(struct dnswire_writer*);
#define dnswire_writer_popped(w) (w).popped
#define dnswire_writer_set_dnstap(w, d) (w).encoder.dnstap = d
#define dnswire_writer_destroy(w) \
free((w).buf); \
free((w).read_buf)
enum dnswire_result dnswire_writer_set_bidirectional(struct dnswire_writer*, bool);
enum dnswire_result dnswire_writer_set_bufsize(struct dnswire_writer*, size_t);
enum dnswire_result dnswire_writer_set_bufinc(struct dnswire_writer*, size_t);
enum dnswire_result dnswire_writer_set_bufmax(struct dnswire_writer*, size_t);
enum dnswire_result dnswire_writer_pop(struct dnswire_writer*, uint8_t*, size_t, uint8_t*, size_t*);
enum dnswire_result dnswire_writer_write(struct dnswire_writer*, int);
static inline enum dnswire_result dnswire_writer_fwrite(struct dnswire_writer* handle, FILE* fp)
{
return dnswire_writer_write(handle, fileno(fp));
}
enum dnswire_result dnswire_writer_stop(struct dnswire_writer*);
#endif
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