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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: dk4a85e.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 DK4A85E_H_INCLUDED
/** Avoid multiple inclusions. */
#define DK4A85E_H_INCLUDED 1


#line 10 "dk4a85e.ctr"

/**	@file	dk4a85e.h	ASCII-85 encoder.

First initialize the encoder using the dk4a85_enc_init().

Now add the binary bytes one by one using the dk4a85_enc_add() function, as
long as you have bytes available and the function returns DK4_EDSTM_ACCEPT
or DK4_EDSTM_FINISHED.

If the function returns DK4_EDSTM_ACCEPT, no further action is required,
the byte was successfully stored in the internal data structures.

If dk4a85_enc_add() returns DK4_EDSTM_FINISHED, a sequence of 4 binary
bytes was processed successfully, a 1 character or 5 character sequence
was produced. Use dk4a85_enc_output() to obtain the characters.

Input data length is not necessarily a multiple of 4, so after feeding
all binary bytes some values might still be stored in the encoder.
Use dk4a85_enc_finish() to check whether an incomplete final sequence
is available. If the function returns DK4_EDSTM_FINISHED, use
dk4a85_enc_output() to obtain the text characters for the final bytes.

*/

#include "dk4conf.h"
#include "dk4error.h"
#include "dk4edstm.h"



/**	ASCII 85 encoder.
*/
typedef struct {
  char		ob[6];		/**< Output bytes, 5 + finalizer */
  unsigned char	ib[4];		/**< Input bytes to process. */
  size_t	ci;		/**< Index of current input byte. */
  size_t	os;		/**< Number of outupt bytes available */
  short		az;		/**< Allow z encoding */
} dk4_a85_enc_t;


#ifdef __cplusplus
extern "C" {
#endif

/**	Initialize ASCII 85 encoder before adding data.
	@param	enc	Encoder to initialize.
	@param	az	Flag: Allow 'z' output character.
	@param	erp	Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS	if enc is NULL.
*/
void
dk4a85_enc_init(dk4_a85_enc_t *enc, int az, dk4_er_t *erp);

/**	Add one byte to encoder.
	@param	enc	Encoder to use.
	@param	input	Input byte to add.
	@param	erp	Error report, may be NULL.
	@return	Action to take, one from:
	- DK4_EDSTM_ACCEPT<br>
	  if input was accepted, no further action necessary at the moment.
	- DK4_EDSTM_FINISHED<br>
	  if a sequence of 4 input bytes was completed, use
	  dk4a85_enc_output() to obtain the text characters.
	- DK4_EDSTM_ERROR<br>
	  if an error occured.
	
	Error codes:
	- DK4_E_INVALID_ARGUMENTS	if enc is NULL.
*/
int
dk4a85_enc_add(dk4_a85_enc_t *enc, unsigned char input, dk4_er_t *erp);

/**	Check for incomplete sequence in state machine after processing
	all input bytes.
	@param	enc	Encoder to use.
	@param	erp	Error report, may be NULL.
	@return	Action to take, one from:
	- DK4_EDSTM_ACCEPT<br>
	  if there is no incomplete sequence in the state machine,
	  no further action necessary.
	- DK4_EDSTM_FINISHED<br>
	  if an incomplete final sequence is available, use
	  dk4a85_enc_output() to obtain the text characters.
	- DK4_EDSTM_ERROR<br>
	  if an error occured.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS	if enc is NULL.
*/
int
dk4a85_enc_finish(dk4_a85_enc_t *enc, dk4_er_t *erp);

/**	Retrieve text sequence.
	@param	dptr	Address of destination pointer to set, should be
			initialized to NULL.
	@param	szptr	Address of size variable to set, should be
			initialized to 0.
	@param	enc	Encoder to use.
	@param	erp	Error report, may be NULL.
	@return	1 on success (text available), 0 otherwise.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS	if enc, dptr, or szptr is NULL.
*/
int
dk4a85_enc_output(
  const char **dptr, size_t *szptr, dk4_a85_enc_t *enc, dk4_er_t *erp
);

#ifdef __cplusplus
}
#endif


#endif