diff options
Diffstat (limited to 'lcmodule/source/cnh1605205_ldr_network_layer/source/protrom_header.c')
| -rw-r--r-- | lcmodule/source/cnh1605205_ldr_network_layer/source/protrom_header.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/lcmodule/source/cnh1605205_ldr_network_layer/source/protrom_header.c b/lcmodule/source/cnh1605205_ldr_network_layer/source/protrom_header.c new file mode 100644 index 0000000..eab4a6a --- /dev/null +++ b/lcmodule/source/cnh1605205_ldr_network_layer/source/protrom_header.c @@ -0,0 +1,237 @@ +/******************************************************************************* + * 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.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; + + 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; + } + + if (*(uint16 *)(Temp_p + 5) < 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 = (uint8 *)((uint32)In_p->Target_p + StartHeaderInBuffer); + memcpy(In_p->Target_p, (uint8 *)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 = (uint8 *)((uint32)In_p->Target_p + StartHeaderInBuffer); + memcpy(In_p->Target_p, (uint8 *)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; +} + +/** @} */ +/** @} */ +/** @} */ |