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/*******************************************************************************
* Copyright (C) ST-Ericsson SA 2011
* License terms: 3-clause BSD license
******************************************************************************/
/**
* @addtogroup ldr_communication_serv
* @{
* @addtogroup protrom_family
* @{
* @addtogroup ldr_header
* @{
*/
/*******************************************************************************
* Includes
******************************************************************************/
#include "c_system_v2.h"
#include <string.h>
#include "t_basicdefinitions.h"
#include "r_protrom_header.h"
#include "r_serialization.h"
/*******************************************************************************
* Declaration of file local functions
******************************************************************************/
static uint8 Protrom_FindHeaderPattern(const uint8 *const HeaderData_p, uint32 *StartInBuffer_p);
/*******************************************************************************
* Definition of internal functions
******************************************************************************/
/*
* Converts 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 Protrom_DeserializeHeader(Protrom_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);
Header_p->SourceAddress = get_uint8(&Iter_p);
Header_p->DestinationAddress = get_uint8(&Iter_p);
Header_p->ReservedField = get_uint8(&Iter_p);
Header_p->PayloadLength = get_uint16(&Iter_p);
}
/*
* Converts the header structure to network format.
*
* The data buffer must be of at least size PROTROM_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 Protrom_SerializeHeader(void *Data_p, const Protrom_Header_t *Header_p)
{
void *Iter_p = Data_p;
put_uint8(&Iter_p, PROTROM_HEADER_PATTERN);
put_uint8(&Iter_p, PROTO_PROTROM);
put_uint8(&Iter_p, PROTROM_SOURCE_ADDRESS);
put_uint8(&Iter_p, PROTROM_DESTINATION_ADDRESS);
put_uint8(&Iter_p, PROTROM_RESERVED_FIELD);
put_uint16(&Iter_p, Header_p->PayloadLength);
}
/*
* 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 Protrom_GetPacketLength(const Protrom_Header_t *Header_p)
{
return PROTROM_HEADER_LENGTH + Header_p->PayloadLength;
}
/*
* Determines whether the first PROTROM_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 Protrom_IsValidHeader(const void *Data_p)
{
uint8 *Temp_p = (uint8 *)Data_p;
uint16 ProtromVal = 0;
if (PROTROM_HEADER_PATTERN != *Temp_p) {
return FALSE;
}
if (PROTO_PROTROM != *(Temp_p + 1)) {
return FALSE;
}
if (PROTROM_SOURCE_ADDRESS != *(Temp_p + 2)) {
return FALSE;
}
if (PROTROM_DESTINATION_ADDRESS != *(Temp_p + 3)) {
return FALSE;
}
if (PROTROM_RESERVED_FIELD != *(Temp_p + 4)) {
return FALSE;
}
ProtromVal = (Temp_p[6] << 8) | Temp_p[5];
if (ProtromVal < 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 Protrom_IsReceivedHeader(Protrom_Inbound_t *In_p)
{
uint32 StartHeaderInBuffer = 0;
uint8 *TmpPointer_p = NULL;
uint8 Res = 0;
Res = Protrom_FindHeaderPattern(In_p->Scratch, &StartHeaderInBuffer);
if (PROTROM_HEADER_PATTERN_CANDIDATE == Res) {
/* call for receiving the rest bytes in header */
In_p->ReqData = StartHeaderInBuffer + PROTROM_HEADER_LENGTH - In_p->RecData;
TmpPointer_p = In_p->Target_p + StartHeaderInBuffer;
memcpy(In_p->Target_p, TmpPointer_p, In_p->RecData - StartHeaderInBuffer);
In_p->ReqBuffOffset = In_p->RecData - StartHeaderInBuffer;
} else {
if (PROTROM_HEADER_PATTERN_MATCH == Res) {
/* Check start point of header in received data */
if (StartHeaderInBuffer == 0) {
return TRUE;
} else {
In_p->ReqData = StartHeaderInBuffer + PROTROM_HEADER_LENGTH - In_p->RecData;
TmpPointer_p = In_p->Target_p + StartHeaderInBuffer;
memcpy(In_p->Target_p, TmpPointer_p, In_p->RecData - StartHeaderInBuffer);
In_p->ReqBuffOffset = In_p->RecData - StartHeaderInBuffer;
}
} else {
In_p->ReqData = PROTROM_HEADER_LENGTH;
In_p->ReqBuffOffset = 0;
}
}
return FALSE;
}
/*
* Find header pattern in the received data.
*
* @param [in] HeaderData_p Pointer to the structure with receiver data.
* @param [out] StartInBuffer_p Offset in the buffer where is find header.
*
* @retval TRUE If header is received.
* @retval FALSE If header is not received.
*/
static uint8 Protrom_FindHeaderPattern(const uint8 *const HeaderData_p, uint32 *StartInBuffer_p)
{
uint8 Res = NO_PROTROM_HEADER_PATTERN;
uint32 Offset = 0;
do {
Res = NO_PROTROM_HEADER_PATTERN;
if (*((uint8 *)HeaderData_p + Offset) == PROTROM_HEADER_PATTERN) {
Res = PROTROM_HEADER_PATTERN_CANDIDATE;
if (Offset < 6) {
if (*((uint8 *)HeaderData_p + Offset + 1) == PROTO_PROTROM) {
if (Offset < 5) {
if (*((uint8 *)HeaderData_p + Offset + 2) == PROTROM_SOURCE_ADDRESS) {
if (Offset < 4) {
if (*((uint8 *)HeaderData_p + Offset + 3) == PROTROM_DESTINATION_ADDRESS) {
Res = PROTROM_HEADER_PATTERN_MATCH;
break;
} else {
Offset = Offset + 2;
Res = NO_PROTROM_HEADER_PATTERN;
}
} else {
Res = PROTROM_HEADER_PATTERN_CANDIDATE;
break;
}
} else {
Offset ++;
Res = NO_PROTROM_HEADER_PATTERN;
}
} else {
Res = PROTROM_HEADER_PATTERN_CANDIDATE;
break;
}
} else {
Res = NO_PROTROM_HEADER_PATTERN;
}
} else {
Res = PROTROM_HEADER_PATTERN_CANDIDATE;
break;
}
}
Offset++;
} while (Offset < PROTROM_HEADER_LENGTH);
*StartInBuffer_p = Offset;
return Res;
}
/** @} */
/** @} */
/** @} */
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