c: move c files into nostrdb in prep for switchover

nostrdb/parser.h

@@ -0,0 +1,42 @@
+
+#ifndef CURSOR_PARSER
+#define CURSOR_PARSER
+
+#include "cursor.h"
+
+static int consume_bytes(struct cursor *cursor, const unsigned char *match, int len)
+{
+	int i;
+
+	if (cursor->p + len > cursor->end) {
+		fprintf(stderr, "consume_bytes overflow\n");
+		return 0;
+	}
+
+	for (i = 0; i < len; i++) {
+		if (cursor->p[i] != match[i])
+			return 0;
+	}
+
+	cursor->p += len;
+
+	return 1;
+}
+
+static inline int consume_byte(struct cursor *cursor, unsigned char match)
+{
+	if (unlikely(cursor->p >= cursor->end))
+		return 0;
+	if (*cursor->p != match)
+		return 0;
+	cursor->p++;
+	return 1;
+}
+
+static inline int consume_u32(struct cursor *cursor, unsigned int match)
+{
+	return consume_bytes(cursor, (unsigned char*)&match, sizeof(match));
+}
+
+#endif /* CURSOR_PARSER */
+