Add raw input support.

raw.c

@@ -0,0 +1,64 @@
+#include <assert.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "common.h"
+#include "raw.h"
+
+
+struct __attribute__((packed)) raw_mode_s_short_overlay {
+	char asterisk;
+	char payload[14];
+	char semicolon;
+	char lf;
+};
+
+struct __attribute__((packed)) raw_mode_s_long_overlay {
+	char asterisk;
+	char payload[28];
+	char semicolon;
+	char lf;
+};
+
+
+void raw_init() {
+	assert(sizeof(struct raw_mode_s_short_overlay) < BUF_LEN_MAX);
+	assert(sizeof(struct raw_mode_s_long_overlay) < BUF_LEN_MAX);
+}
+
+static bool raw_parse_mode_s_short(struct buf *buf, struct packet *packet) {
+	struct raw_mode_s_short_overlay *short_overlay = (struct raw_mode_s_short_overlay *) buf_at(buf, 0);
+	if (buf->length < sizeof(*short_overlay) ||
+			short_overlay->asterisk != '*' ||
+			short_overlay->semicolon != ';' ||
+			short_overlay->lf != '\n') {
+		return false;
+	}
+	packet->type = MODE_S_SHORT;
+	hex_to_bin(packet->payload, short_overlay->payload, sizeof(short_overlay->payload) / 2);
+	buf_consume(buf, sizeof(*short_overlay));
+	return true;
+}
+
+static bool raw_parse_mode_s_long(struct buf *buf, struct packet *packet) {
+	struct raw_mode_s_long_overlay *long_overlay = (struct raw_mode_s_long_overlay *) buf_at(buf, 0);
+	if (buf->length < sizeof(*long_overlay) ||
+			long_overlay->asterisk != '*' ||
+			long_overlay->semicolon != ';' ||
+			long_overlay->lf != '\n') {
+		return false;
+	}
+	packet->type = MODE_S_LONG;
+	hex_to_bin(packet->payload, long_overlay->payload, sizeof(long_overlay->payload) / 2);
+	buf_consume(buf, sizeof(*long_overlay));
+	return true;
+}
+
+bool raw_parse(struct backend *backend, struct packet *packet) {
+	struct buf *buf = &backend->buf;
+
+	return (
+			raw_parse_mode_s_short(buf, packet) ||
+			raw_parse_mode_s_long(buf, packet));
+}