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/*******************************************************************************
* Copyright (C) ST-Ericsson SA 2011
* License terms: 3-clause BSD license
******************************************************************************/
/**
* @addtogroup ldr_communication_serv
* @{
* @addtogroup a2_family
* @{
* @addtogroup ldr_header
* @{
*/
/*******************************************************************************
* Includes
******************************************************************************/
#include "c_system_v2.h"
#include <string.h>
#include "t_basicdefinitions.h"
#include "r_a2_header.h"
#include "r_serialization.h"
/*******************************************************************************
* Declaration of file local functions
******************************************************************************/
static uint8 A2_FindHeaderPattern(const uint8 *const HeaderData_p, uint32 *StartInBuffer_p);
/*******************************************************************************
* Definition of internal functions
******************************************************************************/
/*
* Deserialize the header stored in network format to a structure.
*
* @param [out] Header_p Pointer to the header structure where the
* header data should be placed.
* @param [in] Data_p Pointer to the buffer with received header.
*
* @return none.
*/
void A2_DeserializeHeader(A2_Header_t *Header_p, void *Data_p)
{
void *Iter_p = Data_p;
Header_p->HeaderPattern = get_uint8(&Iter_p);
Header_p->Protocol = get_uint8(&Iter_p);
if (PROTO_A2_ACK == Header_p->Protocol) {
Header_p->SourceAddress = get_uint8(&Iter_p);
Header_p->DestinationAddress = get_uint8(&Iter_p);
Header_p->SequenceNumber = get_uint8(&Iter_p);
Header_p->Reserved[0] = get_uint8(&Iter_p);
Header_p->Reserved[1] = get_uint8(&Iter_p);
Header_p->Reserved[2] = get_uint8(&Iter_p);
Header_p->DataLength = 0;
} else {
Header_p->SourceAddress = get_uint8(&Iter_p);
Header_p->DestinationAddress = get_uint8(&Iter_p);
Header_p->SequenceNumber = get_uint8(&Iter_p);
Header_p->Reserved[0] = get_uint8(&Iter_p);
Header_p->Reserved[1] = get_uint8(&Iter_p);
Header_p->Reserved[2] = get_uint8(&Iter_p);
Header_p->DataLength = get_uint32_le(&Iter_p);
}
}
/*
* Serialize the header structure to network format.
*
* The data buffer must be of at least size HEADER_LENGTH.
*
* @param [out] Data_p Pointer to the buffer where the
* serialized header should be placed.
* @param [in] Header_p Pointer to the source header structure.
*
* @return none.
*/
void A2_SerializeHeader(void *Data_p, const A2_Header_t *Header_p)
{
void *Iter_p = Data_p;
if (PROTO_A2_ACK == Header_p->Protocol) {
put_uint8(&Iter_p, A2_HEADER_PATTERN);
put_uint8(&Iter_p, PROTO_A2_ACK);
put_uint8(&Iter_p, Header_p->SourceAddress);
put_uint8(&Iter_p, Header_p->DestinationAddress);
put_uint8(&Iter_p, Header_p->SequenceNumber);
put_uint8(&Iter_p, Header_p->Reserved[0]);
put_uint8(&Iter_p, Header_p->Reserved[1]);
put_uint8(&Iter_p, Header_p->Reserved[2]);
put_uint16_le(&Iter_p, 0);
} else {
put_uint8(&Iter_p, A2_HEADER_PATTERN);
put_uint8(&Iter_p, PROTO_A2);
put_uint8(&Iter_p, Header_p->SourceAddress);
put_uint8(&Iter_p, Header_p->DestinationAddress);
put_uint8(&Iter_p, Header_p->SequenceNumber);
put_uint8(&Iter_p, Header_p->Reserved[0]);
put_uint8(&Iter_p, Header_p->Reserved[1]);
put_uint8(&Iter_p, Header_p->Reserved[2]);
put_uint32_le(&Iter_p, Header_p->DataLength);
}
}
/*
* Get packet length in bytes given the information in Header_p.
*
* @param [in] Header_p Pointer to the header structure.
*
* @return The length of the packet in bytes.
*/
uint32 A2_GetPacketLength(const A2_Header_t *Header_p)
{
return A2_HEADER_LENGTH + Header_p->DataLength;
}
/*
* Determines whether the first HEADER_LENGTH bytes of Data_p contains a
* valid header.
*
* @param [in] Data_p Pointer to the header candidate.
*
* @retval TRUE If header is valid.
* @retval FALSE If header is not valid.
*/
boolean A2_IsValidHeader(const void *Data_p)
{
uint8 *Temp_p = (uint8 *)Data_p;
if (A2_HEADER_PATTERN != *Temp_p) {
return FALSE;
}
if ((PROTO_A2 != *(Temp_p + 1)) && (PROTO_A2_ACK != *(Temp_p + 1)) && (PROTO_CTRL_MSG != *(Temp_p + 1))) {
return FALSE;
}
return TRUE;
}
/*
* Checks if new header is received.
*
* @param [in] In_p Pointer to the structure with receiver information.
*
* @retval TRUE If header is received.
* @retval FALSE If header is not received.
*/
boolean A2_IsReceivedHeader(A2_Inbound_t *In_p)
{
uint32 StartHeaderInBuffer = 0;
uint8 *TmpPointer_p = NULL;
uint8 Res = 0;
Res = A2_FindHeaderPattern(In_p->Scratch, &StartHeaderInBuffer);
if (A2_HEADER_PATTERN_MATCH == Res) {
/* Check start point of header in received data */
if (StartHeaderInBuffer == 0) {
return TRUE;
} else {
In_p->ReqData = StartHeaderInBuffer;
TmpPointer_p = In_p->Target_p + StartHeaderInBuffer;
memcpy(In_p->Target_p, TmpPointer_p, A2_HEADER_LENGTH - StartHeaderInBuffer);
In_p->ReqBuffOffset = A2_HEADER_LENGTH - StartHeaderInBuffer;
}
} else {
/* setup for receiving new packet */
In_p->State = A2_RECEIVE_ERROR;
}
return FALSE;
}
static uint8 A2_FindHeaderPattern(const uint8 *const HeaderData_p, uint32 *StartInBuffer_p)
{
uint8 Res = NO_A2_HEADER_PATTERN;
uint32 Offset = 0;
do {
Res = NO_A2_HEADER_PATTERN;
if ((*((uint8 *)HeaderData_p + Offset) == A2_HEADER_PATTERN)) {
Res = A2_HEADER_PATTERN_MATCH;
break;
}
Offset++;
} while (Offset < (A2_HEADER_LENGTH - 1));
*StartInBuffer_p = Offset;
return Res;
}
/** @} */
/** @} */
/** @} */
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