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/*
	WARNING: This file was generated by dkct.
	Changes you make here will be lost if dkct is run again!
	You should modify the original source and run dkct on it.
	Original source: dk4rld.ctr
*/

/*
Copyright (C) 2015-2017, Dirk Krause

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above opyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
* Neither the name of the author nor the names of contributors may be used
  to endorse or promote products derived from this software without specific
  prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef DK4RLD_H_INCLUDED
/** Avoid multiple inclusions. */
#define DK4RLD_H_INCLUDED 1


#line 9 "dk4rld.ctr"

/**	@file	dk4rld.h	Run-length decoder.

Use dk4rld_init() to initialize the decoder before feeding data to it.

Feed the encoded data into the decoder byte by byte, use the
dk4rld_add() function.
If the function returns DK4_EDSTM_ACCEPT, the input was successfully stored
into the internal data structures, not need for further action.
If the function returns DK4_EDSTM_FINISHED, an output secquence was
completed, either a run or a literal byte sequence. Use dk4rld_output()
to retrieve output data.
If the dk4rld_add function returns DK4_EDSTM_STOP, an end of data
(EOD) marker was found; do not feed further bytes into the decoder.

After feeding all input bytes into the decoder, use dk4rld_finish() to check
syntax. If the function returns DK4_EDSTM_ERROR, the input data stream
was not properly run-length encoded.
*/

#include "dk4error.h"

/**	Run length decoder.
*/
typedef struct {
  unsigned char		ob[128];	/**< Output buffer. */
  size_t		oused;		/**< Number of used bytes in ob. */
  size_t		ll;		/**< Number of expected bytes. */
  int			st;		/**< Current state. */
} dk4_rl_dec_t;


#ifdef __cplusplus
extern "C" {
#endif

/**	Initialize decoder.
	@param	dec	Decoder to initialize.
	@param	erp	Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS	if enc is NULL.
*/
void
dk4rld_init(dk4_rl_dec_t *dec, dk4_er_t *erp);

/**	Add one encoded byte to decoder.
	@param	dec	Decoder.
	@param	inbyte	Byte to process.
	@param	erp	Error report, may be NULL.
	@return	Action to take, one from:
	- DK4_EDSTM_ACCEPT<br>
	  if the byte was successfully added
	  to the internal data structures, no further action necessary.
	- DK4_EDSTM_FINISHED<br>
	  if output is available, use dk4rld_output() to retrieve output.
	- DK4_EDSTM_STOP<br>
	  if an EOD marker was detected. Do not feed further bytes
	  to the decoder.
	- DK4_EDSTM_ERROR<br>
	  if an error occured.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS	if enc is NULL.
*/
int
dk4rld_add(dk4_rl_dec_t *dec, unsigned char inbyte, dk4_er_t *erp);

/**	Finish decoding.
	@param	dec	Decoder.
	@param	erp	Error report, may be NULL.
	@return	Action to take, one from:
	- DK4_EDSTM_ACCEPT<br>
	  if no remaining data is stored in the decoder, no further
	  action necessary.
	- DK4_EDSTM_FINISHED<br>
	  if output is available, use dk4rld_output() to retrieve output.
	- DK4_EDSTM_ERROR<br>
	  if an error occured.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if enc is NULL.
	- DK4_E_SYNTAX<br>
	  if data indicated by the run-length byte or literally-length
	  byte is missing.
*/
int
dk4rld_finish(dk4_rl_dec_t *dec, dk4_er_t *erp);

/**	Retrieve decoder output.
	@param	dptr	Address of pointer to set to decoder output,
			should be initialized to NULL.
	@param	szptr	Address of variable to receive buffer size,
			should be initialized to 0.
	@param	dec	Decoder.
	@param	erp	Error report, may be NULL.
	@return	1 if data is available, 0 otherwise.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS	if enc is NULL.
*/
int
dk4rld_output(
  const unsigned char **dptr, size_t *szptr, dk4_rl_dec_t *dec, dk4_er_t *erp
);

#ifdef __cplusplus
}
#endif


#endif