44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
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#include "mapinc.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include "fifo.h"
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size_t FIFO_size (FIFO *fifo) {
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fifo->front %= fifo->capacity;
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fifo->back %= fifo->capacity;
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return (fifo->back -fifo->front +fifo->capacity) %fifo->capacity;
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}
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uint8 FIFO_halfFull (FIFO *fifo) {
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return FIFO_size(fifo) >= fifo->capacity /2;
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}
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int FIFO_retrieve (FIFO *fifo) {
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fifo->front %= fifo->capacity;
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return FIFO_size(fifo)? fifo->data[fifo->front++]: 0;
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}
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void FIFO_add (FIFO *fifo, uint8 value) {
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fifo->back %= fifo->capacity;
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if (FIFO_size(fifo) <fifo->capacity) fifo->data[fifo->back++] = value;
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}
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void FIFO_reset (FIFO *fifo) {
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fifo->front = fifo->back = 0;
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}
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void FIFO_init (FIFO *fifo, size_t newCapacity) {
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fifo->capacity = newCapacity;
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fifo->data = (uint8*)FCEU_gmalloc(newCapacity);
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AddExState(fifo->data, fifo->capacity, 0, "FIFD");
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AddExState(&fifo->front, 2, 0, "FIFF");
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AddExState(&fifo->back, 2, 0, "FIFB");
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}
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void FIFO_close (FIFO *fifo) {
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if (fifo->data) {
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free(fifo->data);
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fifo->data = NULL;
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}
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}
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