Added src directory

src/vector.h

@@ -0,0 +1,41 @@
+#ifndef VECTOR_H
+#define VECTOR_H
+
+#include "postgres.h"
+
+#define VECTOR_MAX_DIM 1024
+
+#define VECTOR_SIZE(_dim)		(offsetof(Vector, x) + sizeof(float)*(_dim))
+#define DatumGetVector(x)		((Vector *) PG_DETOAST_DATUM(x))
+#define PG_GETARG_VECTOR_P(x)	DatumGetVector(PG_GETARG_DATUM(x))
+#define PG_RETURN_VECTOR_P(x)	PG_RETURN_POINTER(x)
+
+typedef struct Vector
+{
+	int32		vl_len_;		/* varlena header (do not touch directly!) */
+	int16		dim;			/* number of dimensions */
+	int16		unused;
+	float		x[FLEXIBLE_ARRAY_MEMBER];
+}			Vector;
+
+void		PrintVector(char *msg, Vector * vector);
+int			vector_cmp_internal(Vector * a, Vector * b);
+
+/*
+ * Allocate and initialize a new vector
+ */
+static inline Vector *
+InitVector(int dim)
+{
+	Vector	   *result;
+	int			size;
+
+	size = VECTOR_SIZE(dim);
+	result = (Vector *) palloc0(size);
+	SET_VARSIZE(result, size);
+	result->dim = dim;
+
+	return result;
+}
+
+#endif