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80 lines
2.0 KiB
80 lines
2.0 KiB
9 years ago
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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typedef struct {
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uint8_t *buffer;
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uint16_t capacity;
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uint16_t read_pos;
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uint16_t write_pos;
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uint16_t data_len;
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} CircularByteBuffer;
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/** Init a buffer */
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void cbuf_init(CircularByteBuffer *inst, uint8_t *buffer, uint16_t length);
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/** Test for full buffer */
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bool cbuf_full(CircularByteBuffer *inst);
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/** Test for empty buffer */
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bool cbuf_empty(CircularByteBuffer *inst);
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/** Write a byte to buffer, returns success */
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bool cbuf_write(CircularByteBuffer *inst, uint8_t b);
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/** Read a byte from the buffer, return susccess */
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bool cbuf_read(CircularByteBuffer *inst, uint8_t *b);
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/** Get byte at the read cursor, without incrementing it. False on empty. */
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bool cbuf_peek(CircularByteBuffer *inst, uint8_t *b);
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/** Get data count */
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uint16_t cbuf_data_size(CircularByteBuffer *inst);
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/** Get free space in the buffer */
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uint16_t cbuf_free_space(CircularByteBuffer *inst);
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/** Remove all data from buffer */
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void cbuf_clear(CircularByteBuffer *inst);
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/** Write N bytes. Returns success */
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bool cbuf_write_n(CircularByteBuffer *inst, const uint8_t *b, uint16_t count);
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/** Write a string (without \0) */
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bool cbuf_write_string(CircularByteBuffer *inst, const char *str);
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/** Read N bytes, if available. Returns success. */
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bool cbuf_read_n(CircularByteBuffer *inst, uint8_t *buf, uint16_t len);
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/** Read string of given length, append \0. `str` must be len+1 long */
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bool cbuf_read_string(CircularByteBuffer *inst, char *str, uint16_t len);
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/** Read up to N bytes. Returns byte count */
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uint16_t cbuf_read_upto(CircularByteBuffer *inst, uint8_t *buf, uint16_t max);
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/** Read string up to N chars long, append \0. `str` must be max+1 long */
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uint16_t cbuf_read_string_upto(CircularByteBuffer *inst, char *str, uint16_t max);
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/**
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* Search buffer and return position of the first occurence
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* of the given byte (position relative to read_pos).
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* Returns -1 if not found.
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*/
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int32_t cbuf_find(CircularByteBuffer *inst, uint8_t b);
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