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- /**
- * Marlin 3D Printer Firmware
- * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
- *
- * Based on Sprinter and grbl.
- * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- */
-
- /**
- * libs/heatshrink/heatshrink_decoder.h
- */
- #pragma once
-
- #include "heatshrink_common.h"
- #include "heatshrink_config.h"
-
- #include <stdint.h>
- #include <stddef.h>
-
- typedef enum {
- HSDR_SINK_OK, /* data sunk, ready to poll */
- HSDR_SINK_FULL, /* out of space in internal buffer */
- HSDR_SINK_ERROR_NULL=-1, /* NULL argument */
- } HSD_sink_res;
-
- typedef enum {
- HSDR_POLL_EMPTY, /* input exhausted */
- HSDR_POLL_MORE, /* more data remaining, call again w/ fresh output buffer */
- HSDR_POLL_ERROR_NULL=-1, /* NULL arguments */
- HSDR_POLL_ERROR_UNKNOWN=-2,
- } HSD_poll_res;
-
- typedef enum {
- HSDR_FINISH_DONE, /* output is done */
- HSDR_FINISH_MORE, /* more output remains */
- HSDR_FINISH_ERROR_NULL=-1, /* NULL arguments */
- } HSD_finish_res;
-
- #if HEATSHRINK_DYNAMIC_ALLOC
- #define HEATSHRINK_DECODER_INPUT_BUFFER_SIZE(BUF) \
- ((BUF)->input_buffer_size)
- #define HEATSHRINK_DECODER_WINDOW_BITS(BUF) \
- ((BUF)->window_sz2)
- #define HEATSHRINK_DECODER_LOOKAHEAD_BITS(BUF) \
- ((BUF)->lookahead_sz2)
- #else
- #define HEATSHRINK_DECODER_INPUT_BUFFER_SIZE(_) \
- HEATSHRINK_STATIC_INPUT_BUFFER_SIZE
- #define HEATSHRINK_DECODER_WINDOW_BITS(_) \
- (HEATSHRINK_STATIC_WINDOW_BITS)
- #define HEATSHRINK_DECODER_LOOKAHEAD_BITS(BUF) \
- (HEATSHRINK_STATIC_LOOKAHEAD_BITS)
- #endif
-
- typedef struct {
- uint16_t input_size; /* bytes in input buffer */
- uint16_t input_index; /* offset to next unprocessed input byte */
- uint16_t output_count; /* how many bytes to output */
- uint16_t output_index; /* index for bytes to output */
- uint16_t head_index; /* head of window buffer */
- uint8_t state; /* current state machine node */
- uint8_t current_byte; /* current byte of input */
- uint8_t bit_index; /* current bit index */
-
- #if HEATSHRINK_DYNAMIC_ALLOC
- /* Fields that are only used if dynamically allocated. */
- uint8_t window_sz2; /* window buffer bits */
- uint8_t lookahead_sz2; /* lookahead bits */
- uint16_t input_buffer_size; /* input buffer size */
-
- /* Input buffer, then expansion window buffer */
- uint8_t buffers[];
- #else
- /* Input buffer, then expansion window buffer */
- uint8_t buffers[(1 << HEATSHRINK_DECODER_WINDOW_BITS(_)) + HEATSHRINK_DECODER_INPUT_BUFFER_SIZE(_)];
- #endif
- } heatshrink_decoder;
-
- #if HEATSHRINK_DYNAMIC_ALLOC
- /* Allocate a decoder with an input buffer of INPUT_BUFFER_SIZE bytes,
- * an expansion buffer size of 2^WINDOW_SZ2, and a lookahead
- * size of 2^lookahead_sz2. (The window buffer and lookahead sizes
- * must match the settings used when the data was compressed.)
- * Returns NULL on error. */
- heatshrink_decoder *heatshrink_decoder_alloc(uint16_t input_buffer_size, uint8_t expansion_buffer_sz2, uint8_t lookahead_sz2);
-
- /* Free a decoder. */
- void heatshrink_decoder_free(heatshrink_decoder *hsd);
- #endif
-
- /* Reset a decoder. */
- void heatshrink_decoder_reset(heatshrink_decoder *hsd);
-
- /* Sink at most SIZE bytes from IN_BUF into the decoder. *INPUT_SIZE is set to
- * indicate how many bytes were actually sunk (in case a buffer was filled). */
- HSD_sink_res heatshrink_decoder_sink(heatshrink_decoder *hsd, uint8_t *in_buf, size_t size, size_t *input_size);
-
- /* Poll for output from the decoder, copying at most OUT_BUF_SIZE bytes into
- * OUT_BUF (setting *OUTPUT_SIZE to the actual amount copied). */
- HSD_poll_res heatshrink_decoder_poll(heatshrink_decoder *hsd, uint8_t *out_buf, size_t out_buf_size, size_t *output_size);
-
- /* Notify the dencoder that the input stream is finished.
- * If the return value is HSDR_FINISH_MORE, there is still more output, so
- * call heatshrink_decoder_poll and repeat. */
- HSD_finish_res heatshrink_decoder_finish(heatshrink_decoder *hsd);
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