ESP8266 part of the f105-motor-demo project (see f105-motor-demo_stm32)
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f105-motor-demo_esp/libesphttpd/lib/heatshrink/heatshrink_encoder.h

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3.5 KiB

#ifndef HEATSHRINK_ENCODER_H
#define HEATSHRINK_ENCODER_H
#include <stdint.h>
#include <stddef.h>
#include "heatshrink_common.h"
#include "heatshrink_config.h"
typedef enum {
HSER_SINK_OK, /* data sunk into input buffer */
HSER_SINK_ERROR_NULL=-1, /* NULL argument */
HSER_SINK_ERROR_MISUSE=-2, /* API misuse */
} HSE_sink_res;
typedef enum {
HSER_POLL_EMPTY, /* input exhausted */
HSER_POLL_MORE, /* poll again for more output */
HSER_POLL_ERROR_NULL=-1, /* NULL argument */
HSER_POLL_ERROR_MISUSE=-2, /* API misuse */
} HSE_poll_res;
typedef enum {
HSER_FINISH_DONE, /* encoding is complete */
HSER_FINISH_MORE, /* more output remaining; use poll */
HSER_FINISH_ERROR_NULL=-1, /* NULL argument */
} HSE_finish_res;
#if HEATSHRINK_DYNAMIC_ALLOC
#define HEATSHRINK_ENCODER_WINDOW_BITS(HSE) \
((HSE)->window_sz2)
#define HEATSHRINK_ENCODER_LOOKAHEAD_BITS(HSE) \
((HSE)->lookahead_sz2)
#define HEATSHRINK_ENCODER_INDEX(HSE) \
((HSE)->search_index)
struct hs_index {
uint16_t size;
int16_t index[];
};
#else
#define HEATSHRINK_ENCODER_WINDOW_BITS(_) \
(HEATSHRINK_STATIC_WINDOW_BITS)
#define HEATSHRINK_ENCODER_LOOKAHEAD_BITS(_) \
(HEATSHRINK_STATIC_LOOKAHEAD_BITS)
#define HEATSHRINK_ENCODER_INDEX(HSE) \
(&(HSE)->search_index)
struct hs_index {
uint16_t size;
int16_t index[2 << HEATSHRINK_STATIC_WINDOW_BITS];
};
#endif
typedef struct {
uint16_t input_size; /* bytes in input buffer */
uint16_t match_scan_index;
uint16_t match_length;
uint16_t match_pos;
uint16_t outgoing_bits; /* enqueued outgoing bits */
uint8_t outgoing_bits_count;
uint8_t flags;
uint8_t state; /* current state machine node */
uint8_t current_byte; /* current byte of output */
uint8_t bit_index; /* current bit index */
#if HEATSHRINK_DYNAMIC_ALLOC
uint8_t window_sz2; /* 2^n size of window */
uint8_t lookahead_sz2; /* 2^n size of lookahead */
#if HEATSHRINK_USE_INDEX
struct hs_index *search_index;
#endif
/* input buffer and / sliding window for expansion */
uint8_t buffer[];
#else
#if HEATSHRINK_USE_INDEX
struct hs_index search_index;
#endif
/* input buffer and / sliding window for expansion */
uint8_t buffer[2 << HEATSHRINK_ENCODER_WINDOW_BITS(_)];
#endif
} heatshrink_encoder;
#if HEATSHRINK_DYNAMIC_ALLOC
/* Allocate a new encoder struct and its buffers.
* Returns NULL on error. */
heatshrink_encoder *heatshrink_encoder_alloc(uint8_t window_sz2,
uint8_t lookahead_sz2);
/* Free an encoder. */
void heatshrink_encoder_free(heatshrink_encoder *hse);
#endif
/* Reset an encoder. */
void heatshrink_encoder_reset(heatshrink_encoder *hse);
/* Sink up to SIZE bytes from IN_BUF into the encoder.
* INPUT_SIZE is set to the number of bytes actually sunk (in case a
* buffer was filled.). */
HSE_sink_res heatshrink_encoder_sink(heatshrink_encoder *hse,
uint8_t *in_buf, size_t size, size_t *input_size);
/* Poll for output from the encoder, copying at most OUT_BUF_SIZE bytes into
* OUT_BUF (setting *OUTPUT_SIZE to the actual amount copied). */
HSE_poll_res heatshrink_encoder_poll(heatshrink_encoder *hse,
uint8_t *out_buf, size_t out_buf_size, size_t *output_size);
/* Notify the encoder that the input stream is finished.
* If the return value is HSER_FINISH_MORE, there is still more output, so
* call heatshrink_encoder_poll and repeat. */
HSE_finish_res heatshrink_encoder_finish(heatshrink_encoder *hse);
#endif