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#include "fifo_buffer.h"
u32 FIFO_InitBuffer(tHANDLE *hBuffer, u32 u32BufferLength)
{
u32 u32Error = 0;
tstrFifoHandler *pstrFifoHandler = WILC_MALLOC (sizeof (tstrFifoHandler));
if (pstrFifoHandler) {
WILC_memset (pstrFifoHandler, 0, sizeof (tstrFifoHandler));
pstrFifoHandler->pu8Buffer = WILC_MALLOC (u32BufferLength);
if (pstrFifoHandler->pu8Buffer) {
pstrFifoHandler->u32BufferLength = u32BufferLength;
WILC_memset (pstrFifoHandler->pu8Buffer, 0, u32BufferLength);
/* create semaphore */
sema_init(&pstrFifoHandler->SemBuffer, 1);
*hBuffer = pstrFifoHandler;
} else {
*hBuffer = NULL;
u32Error = 1;
}
} else {
u32Error = 1;
}
return u32Error;
}
u32 FIFO_DeInit(tHANDLE hFifo)
{
u32 u32Error = 0;
tstrFifoHandler *pstrFifoHandler = (tstrFifoHandler *) hFifo;
if (pstrFifoHandler) {
if (pstrFifoHandler->pu8Buffer) {
WILC_FREE (pstrFifoHandler->pu8Buffer);
} else {
u32Error = 1;
}
WILC_FREE (pstrFifoHandler);
} else {
u32Error = 1;
}
return u32Error;
}
u32 FIFO_ReadBytes(tHANDLE hFifo, u8 *pu8Buffer, u32 u32BytesToRead, u32 *pu32BytesRead)
{
u32 u32Error = 0;
tstrFifoHandler *pstrFifoHandler = (tstrFifoHandler *) hFifo;
if (pstrFifoHandler && pu32BytesRead) {
if (pstrFifoHandler->u32TotalBytes) {
down(&pstrFifoHandler->SemBuffer);
if (u32BytesToRead > pstrFifoHandler->u32TotalBytes) {
*pu32BytesRead = pstrFifoHandler->u32TotalBytes;
} else {
*pu32BytesRead = u32BytesToRead;
}
if ((pstrFifoHandler->u32ReadOffset + u32BytesToRead) <= pstrFifoHandler->u32BufferLength) {
WILC_memcpy(pu8Buffer, pstrFifoHandler->pu8Buffer + pstrFifoHandler->u32ReadOffset,
*pu32BytesRead);
/* update read offset and total bytes */
pstrFifoHandler->u32ReadOffset += u32BytesToRead;
pstrFifoHandler->u32TotalBytes -= u32BytesToRead;
} else {
u32 u32FirstPart =
pstrFifoHandler->u32BufferLength - pstrFifoHandler->u32ReadOffset;
WILC_memcpy(pu8Buffer, pstrFifoHandler->pu8Buffer + pstrFifoHandler->u32ReadOffset,
u32FirstPart);
WILC_memcpy(pu8Buffer + u32FirstPart, pstrFifoHandler->pu8Buffer,
u32BytesToRead - u32FirstPart);
/* update read offset and total bytes */
pstrFifoHandler->u32ReadOffset = u32BytesToRead - u32FirstPart;
pstrFifoHandler->u32TotalBytes -= u32BytesToRead;
}
up(&pstrFifoHandler->SemBuffer);
} else {
u32Error = 1;
}
} else {
u32Error = 1;
}
return u32Error;
}
u32 FIFO_WriteBytes(tHANDLE hFifo, u8 *pu8Buffer, u32 u32BytesToWrite, bool bForceOverWrite)
{
u32 u32Error = 0;
tstrFifoHandler *pstrFifoHandler = (tstrFifoHandler *) hFifo;
if (pstrFifoHandler) {
if (u32BytesToWrite < pstrFifoHandler->u32BufferLength) {
if ((pstrFifoHandler->u32TotalBytes + u32BytesToWrite) <= pstrFifoHandler->u32BufferLength ||
bForceOverWrite) {
down(&pstrFifoHandler->SemBuffer);
if ((pstrFifoHandler->u32WriteOffset + u32BytesToWrite) <= pstrFifoHandler->u32BufferLength) {
WILC_memcpy(pstrFifoHandler->pu8Buffer + pstrFifoHandler->u32WriteOffset, pu8Buffer,
u32BytesToWrite);
/* update read offset and total bytes */
pstrFifoHandler->u32WriteOffset += u32BytesToWrite;
pstrFifoHandler->u32TotalBytes += u32BytesToWrite;
} else {
u32 u32FirstPart =
pstrFifoHandler->u32BufferLength - pstrFifoHandler->u32WriteOffset;
WILC_memcpy(pstrFifoHandler->pu8Buffer + pstrFifoHandler->u32WriteOffset, pu8Buffer,
u32FirstPart);
WILC_memcpy(pstrFifoHandler->pu8Buffer, pu8Buffer + u32FirstPart,
u32BytesToWrite - u32FirstPart);
/* update read offset and total bytes */
pstrFifoHandler->u32WriteOffset = u32BytesToWrite - u32FirstPart;
pstrFifoHandler->u32TotalBytes += u32BytesToWrite;
}
/* if data overwriten */
if (pstrFifoHandler->u32TotalBytes > pstrFifoHandler->u32BufferLength) {
/* adjust read offset to the oldest data available */
pstrFifoHandler->u32ReadOffset = pstrFifoHandler->u32WriteOffset;
/* data availabe is the buffer length */
pstrFifoHandler->u32TotalBytes = pstrFifoHandler->u32BufferLength;
}
up(&pstrFifoHandler->SemBuffer);
} else {
u32Error = 1;
}
} else {
u32Error = 1;
}
} else {
u32Error = 1;
}
return u32Error;
}
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