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%% options
copyright owner = Dirk Krause
copyright year = 2015-xxxx
SPDX-License-Identifier: BSD-3-Clause
%% header
/** @file
32 bit character decoding.
CRT on Windows: Not used.
*/
#ifndef DK4CONF_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4conf.h"
#else
#include <dktools-4/dk4conf.h>
#endif
#endif
#ifndef DK4TYPES_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4types.h"
#else
#include <dktools-4/dk4types.h>
#endif
#endif
/** Decoder structure to build a 32 bit character from 4 4 4 4 bytes.
*/
typedef struct {
dk4_c32_t val; /**< Value constructed from the bytes. */
int msb; /**< Flag: First byte is MSB. */
int nb; /**< Number of next byte. */
} dk4_c32_byte_decoder_t;
#ifdef __cplusplus
extern "C" {
#endif
/** Initialize the decoder.
@param ptr Decoder to initialize.
@param msb Flag: Most significant byte first.
*/
void
dk4c32_decoder_init(dk4_c32_byte_decoder_t *ptr, int msb);
/** Add one byte to the decoder.
@param ptr
@param inbyte
@return DK4_EDSTM_ACCEPT if the byte was added to the internal
decoder state (no action necessary) or
DK4_EDSTM_FINISHED if one output was finished (use
dk4c32_decoder_get() to obtain the value).
*/
int
dk4c32_decoder_add(dk4_c32_byte_decoder_t *ptr, unsigned char inbyte);
/** Retrieve output value.
@param ptr Decoder to retrieve value from.
@return Output produced by the decoder.
*/
dk4_c32_t
dk4c32_decoder_get(dk4_c32_byte_decoder_t const *ptr);
/** Check whether the decoder is empty (nothing is stored in the
internal state).
@param ptr Decoder to check.
@return 1 on success (decoder empty), 0 otherwise.
*/
int
dk4c32_decoder_is_empty(dk4_c32_byte_decoder_t const *ptr);
#ifdef __cplusplus
}
#endif
%% module
#include "dk4conf.h"
#include "dk4types.h"
#include "dk4c32.h"
#ifndef DK4EDSTM_H_INCLUDED
#include "dk4edstm.h"
#endif
#if DK4_HAVE_STDLIB_H
#ifndef STDLIB_H_INCLUDED
#include <stdlib.h>
#define STDLIB_H_INCLUDED 1
#endif
#else
#ifndef STDIO_H_INCLUDED
#include <stdio.h>
#define STDIO_H_INCLUDED 1
#endif
#endif
#if DK4_HAVE_ASSERT_H
#ifndef ASSERT_H_INCLUDED
#include <assert.h>
#define ASSERT_H_INCLUDED 1
#endif
#endif
void
dk4c32_decoder_init(dk4_c32_byte_decoder_t *ptr, int msb)
{
#if DK4_USE_ASSERT
assert(NULL != ptr);
#endif
if (NULL != ptr) {
ptr->val = dkC32(0);
ptr->msb = msb;
ptr->nb = 0;
}
}
int
dk4c32_decoder_add(dk4_c32_byte_decoder_t *ptr, unsigned char inbyte)
{
int back = DK4_EDSTM_ERROR;
#if DK4_USE_ASSERT
assert(NULL != ptr);
#endif
if (NULL != ptr) {
switch (ptr->nb) {
case 3: {
if (ptr->msb) {
ptr->val |= (dkC32(0x000000FF) & ((dk4_c32_t)inbyte));
} else {
ptr->val |= (dkC32(0xFF000000) & (((dk4_c32_t)inbyte) << 24));
}
ptr->nb = 0;
back = DK4_EDSTM_FINISHED;
} break;
case 2: {
if (ptr->msb) {
ptr->val |= (dkC32(0x0000FF00) & (((dk4_c32_t)inbyte) << 8));
} else {
ptr->val |= (dkC32(0x00FF0000) & (((dk4_c32_t)inbyte) << 16));
}
ptr->nb = 3;
back = DK4_EDSTM_ACCEPT;
} break;
case 1: {
if (ptr->msb) {
ptr->val |= (dkC32(0x00FF0000) & (((dk4_c32_t)inbyte) << 16));
} else {
ptr->val |= (dkC32(0x0000FF00) & (((dk4_c32_t)inbyte) << 8));
}
ptr->nb = 2;
back = DK4_EDSTM_ACCEPT;
} break;
default: {
if (ptr->msb) {
ptr->val = (dkC32(0xFF000000) & (((dk4_c32_t)inbyte) << 24));
} else {
ptr->val = (dkC32(0x000000FF) & ((dk4_c32_t)inbyte));
}
ptr->nb = 1;
back = DK4_EDSTM_ACCEPT;
} break;
}
}
return back;
}
dk4_c32_t
dk4c32_decoder_get(dk4_c32_byte_decoder_t const *ptr)
{
dk4_c32_t back = dkC32(0);
#if DK4_USE_ASSERT
assert(NULL != ptr);
#endif
if (NULL != ptr) {
back = ptr->val;
}
return back;
}
int
dk4c32_decoder_is_empty(dk4_c32_byte_decoder_t const *ptr)
{
int back = 0;
#if DK4_USE_ASSERT
assert(NULL != ptr);
#endif
if (NULL != ptr) {
if (0 == ptr->nb) {
back = 1;
}
}
return back;
}
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