50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct {
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uint8_t *data; // the data buffer
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uintptr_t size; // size of data buffer
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uint8_t *begin, *end; // begin and past-the-end for in-queue data
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uintptr_t count; // number of in-queue bytes
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} queue;
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// initialize a queue with a existing buffer
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void queue_InitBuffered(queue *q, void *buffer, uintptr_t size);
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// writes one byte to the queue, discarding if full
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void queue_PushByte(queue *q, const uint8_t b);
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// pops one byte from the front of the queue, returning it
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uint8_t queue_PopByte(queue *q);
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// write Size bytes to the queue, none written if there is not space for all the bytes
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void queue_Push(queue *q, const void *buffer, uintptr_t size);
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// pops Size bytes from the queue, none popped if there are no enough data
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// returns the number of bytes popped (either Size or 0)
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uintptr_t queue_Pop(queue *q, void *buffer, uintptr_t size);
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// return the byte at the front of the queue
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uint8_t queue_FrontByte(queue *q);
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// tells if the queue is empty
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bool queue_Empty(queue *q);
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// returns the number of bytes in the queue
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uintptr_t queue_Size(queue *q);
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// returns the empty space left at the end of the queue
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uintptr_t queue_Space(queue *q);
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#ifdef __cplusplus
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}
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#endif
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