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/*
Copyright (C) 2015-2020, Dirk Krause
SPDX-License-Identifier: BSD-3-Clause
*/
/*
WARNING: This file was generated by the dkct program (see
http://dktools.sourceforge.net/ for details).
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: dk4rle.ctr
*/
#ifndef DK4RLE_H_INCLUDED
/** Avoid multiple inclusions. */
#define DK4RLE_H_INCLUDED 1
#line 10 "dk4rle.ctr"
/** @file dk4rle.h Run length encoder as
described in the PS and PDF specifications.
Use the dk4rle_init() function to initialize the encoder first.
Add binary data byte by byte, use dk4rle_add(). If this function
returns DK4_EDSTM_ACCEPT, the byte was successfully stored in the encoder,
no further action is necessary. If the function returns DK4_EDSTM_FINISHED,
either a run or a sequence of literal bytes was completed; use
dk4rle_output() to retrieve the output data.
After passing all bytes to the encoder there is probably data in the
encoder not yet retrieved. Use the dk4rle_finish() function to check.
If the function returns DK4_EDSTM_FINISHED, use dk4rle_output() to retrieve
the final output data.
*/
#ifndef DK4CONF_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4conf.h"
#else
#include <dktools-4/dk4conf.h>
#endif
#endif
#ifndef DK4ERROR_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4error.h"
#else
#include <dktools-4/dk4error.h>
#endif
#endif
/** Run-length encoder.
*/
typedef struct {
unsigned char ob[144]; /**< Buffer for both input and output. */
unsigned char *ib; /**< Pointer to ob[1], input buffer. */
size_t oused; /**< Output buffer size. */
size_t iused; /**< Number of input bytes available. */
size_t ao_si; /**< Index to save bytes from after output. */
size_t ao_ss; /**< Size of buffer part to save after out. */
size_t ao_iu; /**< Number of input bytes after output. */
int ao_st; /**< New state after output. */
int st; /**< Current state. */
int lwo; /**< Flag: Last operation was output. */
int weod; /**< Flag: Write EOD marker at end. */
} dk4_rl_enc_t;
#ifdef __cplusplus
extern "C" {
#endif
/** Initialize encoder before using it.
@param enc Encoder to initialize.
@param weod Flag: Write EOD marker at end of data.
@param erp Error report, may be NULL.
Error codes:
- DK4_E_INVALID_ARGUMENTS if enc is NULL.
*/
void
dk4rle_init(dk4_rl_enc_t *enc, int weod, dk4_er_t *erp);
/** Add a single byte to the encoder.
@param enc Encoder.
@param ibyte Input byte to process.
@param erp Error report, may be NULL.
@return Action to take, one from:
- DK4_EDSTM_ACCEPT<br>
if the input byte was successfully stored in the internal data
structures without completing a run. No further action
necessary.
- DK4_EDSTM_FINISHED<br>
if a run was completed. Use dk4rle_output() to obtain the
output data.
- DK4_EDSTM_ERROR<br>
if an error occured.
Error codes:
- DK4_E_INVALID_ARGUMENTS if enc is NULL.
*/
int
dk4rle_add(dk4_rl_enc_t *enc, unsigned char ibyte, dk4_er_t *erp);
/** Finish data stream, process final data still stored in the
encoder.
@param enc Encoder.
@param erp Error report, may be NULL.
@return Action to take, one from:
- DK4_EDSTM_ACCEPT<br>
if the input byte was successfully stored in the internal data
structures without completing a run. No further action
necessary.
- DK4_EDSTM_FINISHED<br>
if a run was completed. Use dk4rle_output() to obtain the
output data.
- DK4_EDSTM_ERROR<br>
if an error occured.
Error codes:
- DK4_E_INVALID_ARGUMENTS if enc is NULL.
*/
int
dk4rle_finish(dk4_rl_enc_t *enc, dk4_er_t *erp);
/** Retrieve encoder output.
@param dptr Address of pointer to set to output bytes, should
be initialized to NULL.
@param szptr Address of size variable for buffer length,
should be initialized to 0.
@param enc Encoder.
@param erp Error report, may be NULL.
@return 1 if there is data available, 0 otherwise.
Error codes:
- DK4_E_INVALID_ARGUMENTS if enc is NULL.
*/
int
dk4rle_output(
const unsigned char **dptr,
size_t *szptr,
dk4_rl_enc_t const *enc,
dk4_er_t *erp
);
#ifdef __cplusplus
}
#endif
#endif
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