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#include "fifobuffer.h"
#include "alloc.h"
FifoBuffer* FifoBuffer_create(uint32 capacity) {
FifoBuffer* fifo = (FifoBuffer*)kmalloc(sizeof(FifoBuffer));
memset((uint8*)fifo, 0, sizeof(FifoBuffer));
fifo->data = (uint8*)kmalloc(capacity);
memset((uint8*)fifo->data, 0, capacity);
fifo->capacity= capacity;
return fifo;
}
void FifoBuffer_destroy(FifoBuffer* fifoBuffer) {
kfree(fifoBuffer->data);
kfree(fifoBuffer);
}
void FifoBuffer_clear(FifoBuffer* fifoBuffer) {
fifoBuffer->usedBytes = 0;
fifoBuffer->readIndex = 0;
fifoBuffer->writeIndex = 0;
}
BOOL FifoBuffer_isEmpty(FifoBuffer* fifoBuffer) {
if (0 == fifoBuffer->usedBytes) {
return TRUE;
}
return FALSE;
}
uint32 FifoBuffer_getSize(FifoBuffer* fifoBuffer) {
return fifoBuffer->usedBytes;
}
uint32 FifoBuffer_getCapacity(FifoBuffer* fifoBuffer) {
return fifoBuffer->capacity;
}
uint32 FifoBuffer_getFree(FifoBuffer* fifoBuffer) {
return fifoBuffer->capacity - fifoBuffer->usedBytes;
}
int32 FifoBuffer_enqueue(FifoBuffer* fifoBuffer, uint8* data, uint32 size) {
if (size == 0) {
return -1;
}
uint32 bytesAvailable = fifoBuffer->capacity - fifoBuffer->usedBytes;
if (size > bytesAvailable) {
return -1;
}
uint32 i = 0;
while (fifoBuffer->usedBytes < fifoBuffer->capacity && i < size) {
fifoBuffer->data[fifoBuffer->writeIndex] = data[i++];
fifoBuffer->usedBytes++;
fifoBuffer->writeIndex++;
fifoBuffer->writeIndex %= fifoBuffer->capacity;
}
return size;
}
int32 FifoBuffer_dequeue(FifoBuffer* fifoBuffer, uint8* data, uint32 size) {
if (size == 0) {
return -1;
}
if (0 == fifoBuffer->usedBytes) {
//Buffer is empty
return 0;
}
uint32 i = 0;
while (fifoBuffer->usedBytes > 0 && i < size) {
data[i++] = fifoBuffer->data[fifoBuffer->readIndex];
fifoBuffer->usedBytes--;
fifoBuffer->readIndex++;
fifoBuffer->readIndex %= fifoBuffer->capacity;
}
return i;
}
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