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shade.c
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298 lines (268 loc) · 7.24 KB
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#include <protocol/shade.h>
uint8_t shade_header_size_get(shade_header *header) {
uint8_t size = 4;
if (header->PFC & SHADE_PFC_SHM)
size = 2;
switch ((header->PFC & SHADE_PFC_PISCS_MASK) >> SHADE_PFC_PISCS_POS) {
case (SHADE_SIZE_0):
break;
case (SHADE_SIZE_1):
size += 1;
break;
case (SHADE_SIZE_2):
size += 2;
break;
case (SHADE_SIZE_4):
size += 4;
break;
default:
break;
}
switch ((header->PFC & SHADE_PFC_PDSS_MASK) >> SHADE_PFC_PDSS_POS) {
case (SHADE_SIZE_0):
break;
case (SHADE_SIZE_1):
size += 1;
break;
case (SHADE_SIZE_2):
size += 2;
break;
case (SHADE_SIZE_4):
size += 4;
break;
default:
break;
}
switch ((header->PFC & SHADE_PFC_PCSS_MASK) >> SHADE_PFC_PCSS_POS) {
case (SHADE_SIZE_0):
break;
case (SHADE_SIZE_1):
size += 1;
break;
case (SHADE_SIZE_2):
size += 2;
break;
case (SHADE_SIZE_4):
size += 4;
break;
default:
break;
}
return size;
}
uint32_t shade_packet_size_get(shade_header *header) {
uint32_t hs = shade_header_size_get(header);
uint32_t ps = shade_payload_size_get(header);
return hs + ps;
}
uint16_t shade_ptid_get(shade_header *header) {
if (header->PFC & SHADE_PFC_SHM)
return header->PSID; //PTIDL shifts into PSID position, PSID absent
return ((uint16_t) header->PTIDL + ((uint16_t) header->PTIDH << 8));
}
uint8_t shade_psid_get(shade_header *header) {
if (header->PFC & SHADE_PFC_SHM)
return 0;
return header->PSID;
}
uint8_t shade_pfc_get(shade_header *header) {
return header->PFC;
}
uint8_t shade_mode_get(shade_header *header) {
return header->PFC;
}
uint8_t shade_pisc_value_size_get(shade_header *header) {
uint8_t size;
switch ((header->PFC & SHADE_PFC_PISCS_MASK) >> SHADE_PFC_PISCS_POS) {
case (SHADE_SIZE_0):
size = 0;
break;
case (SHADE_SIZE_1):
size = 1;
break;
case (SHADE_SIZE_2):
size = 2;
break;
case (SHADE_SIZE_4):
size = 4;
break;
default:
break;
}
return size;
}
uint32_t shade_pisc_get(shade_header *header) {
uint8_t size = shade_pisc_value_size_get(header);
if (size == 0)
return 0;
uint8_t header_start_size = 4;
if (header->PFC & SHADE_PFC_SHM)
header_start_size = 2;
uint8_t *base = (uint8_t*) header + header_start_size;
uint32_t result = 0;
for (uint8_t i = 0; i < size; ++i) {
result |= ((uint32_t) base[i]) << (i * 8);
}
return result;
}
uint8_t shade_pds_value_size_get(shade_header *header) {
uint8_t size;
switch ((header->PFC & SHADE_PFC_PDSS_MASK) >> SHADE_PFC_PDSS_POS) {
case (SHADE_SIZE_0):
size = 0;
break;
case (SHADE_SIZE_1):
size = 1;
break;
case (SHADE_SIZE_2):
size = 2;
break;
case (SHADE_SIZE_4):
size = 4;
break;
default:
break;
}
return size;
}
uint32_t shade_pds_get(shade_header *header) {
uint8_t size = shade_pds_value_size_get(header);
if (size == 0)
return 0;
uint8_t header_start_size = 4;
if (header->PFC & SHADE_PFC_SHM)
header_start_size = 2;
uint8_t offset = header_start_size + shade_pisc_value_size_get(header);
uint8_t *base = (uint8_t*) header + offset;
uint32_t result = 0;
for (uint8_t i = 0; i < size; ++i) {
result |= ((uint32_t) base[i]) << (i * 8);
}
return result;
}
uint32_t shade_payload_size_get(shade_header *header) {
uint8_t size = shade_pds_value_size_get(header);
if (size == 0)
return 0;
return shade_pds_get(header) + 1;
}
uint8_t shade_pcs_value_size_get(shade_header *header) {
uint8_t size;
switch ((header->PFC & SHADE_PFC_PCSS_MASK) >> SHADE_PFC_PCSS_POS) {
case (SHADE_SIZE_0):
size = 0;
break;
case (SHADE_SIZE_1):
size = 1;
break;
case (SHADE_SIZE_2):
size = 2;
break;
case (SHADE_SIZE_4):
size = 4;
break;
default:
break;
}
return size;
}
uint32_t shade_pcs_get(shade_header *header) {
uint8_t size = shade_pcs_value_size_get(header);
if (size == 0)
return 0;
uint8_t header_start_size = 4;
if (header->PFC & SHADE_PFC_SHM)
header_start_size = 2;
uint8_t offset = header_start_size + shade_pisc_value_size_get(header) + shade_pds_value_size_get(header);
uint8_t *base = (uint8_t*) header + offset;
uint32_t result = 0;
for (uint8_t i = 0; i < size; ++i) {
result |= ((uint32_t) base[i]) << (i * 8);
}
return result;
}
uint8_t* shade_payload_get(shade_header *header) {
uint32_t payload_size = shade_payload_size_get(header);
if (payload_size == 0) {
return (uint8_t*) 0; // No payload exists
}
uint32_t hs = shade_header_size_get(header);
return (uint8_t*) header + hs;
}
void shade_pfc_set(shade_header *header, uint8_t pfc) {
header->PFC = pfc;
}
void shade_mode_set(shade_header *header, uint8_t mode) {
header->PFC = mode;
}
uint8_t shade_psid_set(shade_header *header, uint8_t psid) {
if (header->PFC & SHADE_PFC_SHM)
return 0;
header->PSID = psid;
return psid;
}
uint16_t shade_ptid_set(shade_header *header, uint16_t ptid) {
if (header->PFC & SHADE_PFC_SHM) {
header->PSID = (uint8_t) (ptid & 0xFF); //in short header mode, PTIDL is in PSID place
return header->PSID;
}
header->PTIDL = (uint8_t) ((ptid >> 0) & 0xFF);
header->PTIDH = (uint8_t) ((ptid >> 8) & 0xFF);
return ptid;
}
uint32_t shade_pisc_set(shade_header *header, uint32_t pisc) {
uint8_t size = shade_pisc_value_size_get(header);
uint8_t header_start_size = 4;
if (header->PFC & SHADE_PFC_SHM)
header_start_size = 2;
uint8_t *field = (uint8_t*) header + header_start_size;
uint32_t real_value = 0;
for (int i = 0; i < size; ++i) {
field[i] = (pisc >> (8 * i)) & 0xFF;
((uint8_t*) (&real_value))[i] = field[i];
}
return real_value;
}
uint32_t shade_pds_set(shade_header *header, uint32_t pds) {
uint8_t size = shade_pds_value_size_get(header);
uint8_t header_start_size = 4;
if (header->PFC & SHADE_PFC_SHM)
header_start_size = 2;
uint8_t *field = (uint8_t*) header + header_start_size + shade_pisc_value_size_get(header);
uint32_t real_value = 0;
for (int i = 0; i < size; ++i) {
field[i] = (pds >> (8 * i)) & 0xFF;
((uint8_t*) (&real_value))[i] = field[i];
}
return real_value;
}
uint32_t shade_payload_size_set(shade_header *header, uint32_t payload_byte_size) {
if (payload_byte_size == 0)
return 0;
return shade_pds_set(header, payload_byte_size - 1) + 1;
}
uint32_t shade_pcs_set(shade_header *header, uint32_t pcs) {
uint8_t header_start_size = 4;
if (header->PFC & SHADE_PFC_SHM)
header_start_size = 2;
uint8_t pisc_size = shade_pisc_value_size_get(header);
uint8_t pds_size = shade_pds_value_size_get(header);
uint8_t pcs_size = shade_pcs_value_size_get(header);
uint8_t *field = (uint8_t*) header + header_start_size + pisc_size + pds_size;
uint32_t real_value = 0;
for (int i = 0; i < pcs_size; ++i) {
field[i] = (pcs >> (8 * i)) & 0xFF;
((uint8_t*) (&real_value))[i] = field[i];
}
return real_value;
}
void shade_payload_shade_version_set(shade_header *header) {
uint8_t *payload = shade_payload_get(header);
if (!payload)
return;
// Write enum value byte-by-byte (little-endian)
payload[0] = (uint8_t) (SHADE_VERSION_MAJOR & 0xFF);
payload[1] = (uint8_t) (SHADE_VERSION_MINOR & 0xFF);
// Update packet size to include 2 bytes of payload
shade_payload_size_set(header, 2);
}