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RingBuff.c
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RingBuff.c
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/*
MyUSB Library
Copyright (C) Dean Camera, 2008.
dean [at] fourwalledcubicle [dot] com
www.fourwalledcubicle.com
Released under the LGPL Licence, Version 3
*/
#include "RingBuff.h"
void Buffer_Initialize(RingBuff_t* Buffer)
{
BUFF_ATOMIC_BLOCK
{
Buffer->InPtr = (RingBuff_Data_t*)&Buffer->Buffer;
Buffer->OutPtr = (RingBuff_Data_t*)&Buffer->Buffer;
Buffer->Elements = 0;
}
}
void Buffer_StoreElement(RingBuff_t* Buffer, RingBuff_Data_t Data)
{
BUFF_ATOMIC_BLOCK
{
#if defined(BUFF_DROPOLD)
if (Buffer->Elements == BUFF_LENGTH)
{
Buffer->OutPtr++;
if (Buffer->OutPtr == &Buffer->Buffer[BUFF_LENGTH])
Buffer->OutPtr = (RingBuff_Data_t*)&Buffer->Buffer;
}
else
{
Buffer->Elements++;
}
#elif defined(BUFF_DROPNEW)
if (Buffer->Elements == BUFF_LENGTH)
return;
Buffer->Elements++;
#elif defined(BUFF_NODROPCHECK)
Buffer->Elements++;
#endif
*(Buffer->InPtr) = Data;
Buffer->InPtr++;
if (Buffer->InPtr == &Buffer->Buffer[BUFF_LENGTH])
Buffer->InPtr = (RingBuff_Data_t*)&Buffer->Buffer;
}
}
RingBuff_Data_t Buffer_GetElement(RingBuff_t* Buffer)
{
RingBuff_Data_t BuffData;
BUFF_ATOMIC_BLOCK
{
#if defined(BUFF_EMPTYRETURNSZERO)
if (!(Buffer->Elements))
return 0;
#elif !defined(BUFF_NOEMPTYCHECK)
#error No empty buffer check behaviour specified.
#endif
BuffData = *(Buffer->OutPtr);
Buffer->OutPtr++;
Buffer->Elements--;
if (Buffer->OutPtr == &Buffer->Buffer[BUFF_LENGTH])
Buffer->OutPtr = (RingBuff_Data_t*)&Buffer->Buffer;
}
return BuffData;
}
#if defined(BUFF_USEPEEK)
RingBuff_Data_t Buffer_PeekElement(const RingBuff_t* Buffer)
{
RingBuff_Data_t BuffData;
BUFF_ATOMIC_BLOCK
{
#if defined(BUFF_EMPTYRETURNSZERO)
if (!(Buffer->Elements))
return 0;
#elif !defined(BUFF_NOEMPTYCHECK)
#error No empty buffer check behaviour specified.
#endif
BuffData = *(Buffer->OutPtr);
}
return BuffData;
}
#endif