eco2d/code/common/packets/packet.c

60 lines
1.8 KiB
C

#include "packet.h"
#include "packet_utils.h"
#include "cwpack/cwpack.h"
#define PKT_HEADER_ELEMENTS 2
pkt_handler pkt_handlers[] = {
{.id = MSG_ID_01_WELCOME, .handler = pkt_01_welcome_handler},
};
uint8_t pkt_buffer[PKT_BUFSIZ];
int32_t pkt_header_encode(pkt_header *table) {
return 0;
}
int32_t pkt_header_decode(pkt_header *table, void *data, size_t datalen) {
cw_unpack_context uc = {0};
pkt_unpack_msg_raw(&uc, data, datalen, PKT_HEADER_ELEMENTS);
cw_unpack_next(&uc);
if (uc.item.type != CWP_ITEM_POSITIVE_INTEGER || uc.item.as.u64 > UINT16_MAX) {
return -1; // invalid packet id
}
uint16_t pkt_id = (uint16_t)uc.item.as.u64;
cw_unpack_next(&uc);
const void *packed_blob = uc.item.as.bin.start;
uint32_t packed_size = uc.item.as.bin.length;
table->id = pkt_id;
table->data = packed_blob;
table->datalen = packed_size;
table->ok = 1;
return pkt_validate_eof_msg(&uc);
}
int32_t pkt_unpack_struct(cw_unpack_context *uc, pkt_desc *desc, void *raw_blob, uint32_t blob_size) {
uint8_t *blob = (uint8_t*)raw_blob;
for (pkt_desc *field = desc; field->type != 0; ++field) {
cw_unpack_next(uc);
if (uc->item.type != field->type) return -1; // unexpected field
if (blob + field->offset + field->size >= blob + blob_size) return -1; // field does not fit
switch (field->type) {
case CWP_ITEM_POSITIVE_INTEGER: {
zpl_memcopy(blob + field->offset, (uint8_t*)uc->item.as.u64, field->size);
}break;
default: {
zpl_printf("[WARN] unsupported pkt field type %lld !\n", field->type);
return -1; // unsupported field
}break;
}
}
return 0;
}
#include "packets/pkt_01_welcome.c"