Parse full airspy input.

common.c

@@ -8,13 +8,13 @@
 
 
 ssize_t buf_fill(struct buf *buf, int fd) {
-	if (buf->start + buf->length == BUF_LEN) {
+	if (buf->start + buf->length == BUF_LEN_MAX) {
 		assert(buf->start > 0);
 		memmove(buf->buf, buf_at(buf, 0), buf->length);
 		buf->start = 0;
 	}
 
-	size_t space = BUF_LEN - buf->length - buf->start;
+	size_t space = BUF_LEN_MAX - buf->length - buf->start;
 	ssize_t in = read(fd, buf_at(buf, buf->length), space);
 	if (in < 0) {
 		return in;
@@ -33,3 +33,36 @@ void buf_consume(struct buf *buf, size_t length) {
 		buf->start = 0;
 	}
 }
+
+
+static uint8_t hex_table[256] = {0};
+
+void hex_init() {
+	for (int i = '0'; i <= '9'; i++) {
+		hex_table[i] = i - '0';
+	}
+	for (int i = 'a'; i <= 'f'; i++) {
+		hex_table[i] = 10 + i - 'a';
+	}
+	for (int i = 'A'; i <= 'F'; i++) {
+		hex_table[i] = 10 + i - 'A';
+	}
+}
+
+void hex_to_bin(char *out, char *in, size_t bytes) {
+	uint8_t *in2 = (uint8_t *) in;
+	for (size_t i = 0, j = 0; i < bytes; i++, j += 2) {
+		out[i] = (hex_table[in2[j]] << 4) | hex_table[in2[j + 1]];
+	}
+}
+
+uint64_t hex_to_int(char *in, size_t bytes) {
+	uint8_t *in2 = (uint8_t *) in;
+	uint64_t ret = 0;
+	bytes *= 2;
+	for (size_t i = 0; i < bytes; i++) {
+		ret <<= 4;
+		ret |= hex_table[in2[i]];
+	}
+	return ret;
+}