60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include "buf.h"
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#include "hex.h"
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#include "packet.h"
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#include "uuid.h"
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#include "raw.h"
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struct __attribute__((packed)) raw_overlay {
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char semicolon;
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char cr_lf;
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char lf;
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};
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static bool raw_parse_packet(struct buf *buf, struct packet *packet, enum packet_type type) {
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size_t payload_bytes = packet_payload_len[type];
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size_t overlay_start = 1 + payload_bytes;
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struct raw_overlay *overlay = (struct raw_overlay *) buf_at(buf, overlay_start);
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size_t total_len = overlay_start + sizeof(*overlay);
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if (((buf->length < sizeof(*overlay) - 1 || overlay->cr_lf != '\n') &&
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(buf->length < sizeof(*overlay) || overlay->cr_lf != '\r' || overlay->lf != '\n')) ||
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buf_chr(buf, 0) != '*' ||
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overlay->semicolon != ';') {
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return false;
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}
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if (!hex_to_bin(packet->payload, buf_at(buf, 1), payload_bytes)) {
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return false;
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}
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packet->type = type;
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buf_consume(buf, overlay->cr_lf == '\r' ? total_len : total_len - 1);
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return true;
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}
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void raw_init() {
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assert(1 + PACKET_PAYLOAD_LEN_MAX + sizeof(struct raw_overlay) < BUF_LEN_MAX);
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}
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bool raw_parse(struct buf *buf, struct packet *packet, void __attribute__((unused)) *state_in) {
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return (
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raw_parse_packet(buf, packet, PACKET_TYPE_MODE_AC) ||
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raw_parse_packet(buf, packet, PACKET_TYPE_MODE_S_SHORT) ||
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raw_parse_packet(buf, packet, PACKET_TYPE_MODE_S_LONG));
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}
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void raw_serialize(struct packet *packet, struct buf *buf) {
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size_t payload_bytes = packet_payload_len[packet->type];
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size_t overlay_start = 1 + (payload_bytes * 2);
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struct raw_overlay *overlay = (struct raw_overlay *) buf_at(buf, overlay_start);
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size_t total_len = overlay_start + sizeof(*overlay);
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buf_chr(buf, 0) = '*';
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overlay->semicolon = ';';
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overlay->cr_lf = '\n';
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hex_from_bin_upper(buf_at(buf, 1), packet->payload, payload_bytes);
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buf->length = total_len - 1;
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}
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