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#include <buffer.h>
#include <types.h>
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int BufferReady(Buffer* Buf){
int ready = ((Buf!=NULL) &&(Buf->Size >0))? 1:0;
return ready;
}
int FeedBuffer(Buffer* Buf,void* Word)
{
if(BufferReady(Buf)){
if(Buf->Length == Buf->Size) return BUFF_FULL;
(Buf->Storage)[Buf->Tail] = *Word;
Buf->Tail = (Buf->Tail + 1) % (Buf->Size);
Buf->Length = Buf->Length + 1;
return 0;
}else return BUFF_NOTREADY;
}
int BufferFIFO(Buffer* Buf,void* Dest)
{
if(BufferReady(Buf)){
if(Buf->Length == 0) return BUFF_EMPTY;
*Word = (Buf->Storage)[Buf->Head];
return 0;
}else return BUFF_NOTREADY;
}
int BufferPopHead(Buffer* Buf)
{
if(BufferReady(Buf)){
if(Buf->Length == 0) return BUFF_EMPTY;
Buf->Head = (Buf->Head +1) % Buf->Size;
Buf->Length = (Buf->Length) - 1;
return 0;
}else return BUFF_NOTREADY;
}
int BufferFILO(Buffer* Buf, void* Dest)
{
if(Buf->Size == 0) return BUFF_NOTREADY;
if(Buf->Length == 0) return BUFF_EMPTY;
*Word = (Buf->Storage)[Buf->Tail];
return 0;
}
int BufferPopLast(Buffer* Buf)
{
if(BufferReady(Buf)){
if(Buf->Length == 0) return BUFF_EMPTY;
Buf->Tail = (Buf->Tail - 1 + Buf->Size) % Buf->Size;
Buf->Length = (Buf->Length) - 1;
return 0;
}else return BUFF_NOTREADY;
}
int ClearBuffer(Buffer* Buf)
{
if(BufferReady(Buf)){
Buf->Length = 0;
Buf->Tail = Buf->Head;
return 0;
}else return BUFF_NOTREADY;
}
int BufferShrinkFIFO(Buffer* Buf, int Num)
{
if(BufferReady(Buf)){
int ActualShrink = (Num > Buf->Length)? (Buf->Length): Num;
Buf->Length = Buf->Length - ActualShrink;
Buf->Head = (Buf->Head + ActualShrink) % Buf->Size;
return 0;
}else return BUFF_NOTREADY;