diff --git a/src/datum_utils.h b/src/datum_utils.h
new file mode 100644
index 0000000..2806e80
--- /dev/null
+++ b/src/datum_utils.h
@@ -0,0 +1,89 @@
+#ifndef _DATUM_UTILS_H_
+#define _DATUM_UTILS_H_
+
+#include <stdint.h>
+
+static inline
+uint8_t upk_u8(const void * const bufp, const int offset)
+{
+	const uint8_t * const buf = bufp;
+	return buf[offset];
+}
+
+#define upk_u8le(buf, offset)  upk_u8(buf, offset)
+
+static inline
+uint16_t upk_u16le(const void * const bufp, const int offset)
+{
+	const uint8_t * const buf = bufp;
+	return (((uint16_t)buf[offset+0]) <<    0)
+	     | (((uint16_t)buf[offset+1]) <<    8);
+}
+
+static inline
+uint32_t upk_u32le(const void * const bufp, const int offset)
+{
+	const uint8_t * const buf = bufp;
+	return (((uint32_t)buf[offset+0]) <<    0)
+	     | (((uint32_t)buf[offset+1]) <<    8)
+	     | (((uint32_t)buf[offset+2]) << 0x10)
+	     | (((uint32_t)buf[offset+3]) << 0x18);
+}
+
+static inline
+uint64_t upk_u64le(const void * const bufp, const int offset)
+{
+	const uint8_t * const buf = bufp;
+	return (((uint64_t)buf[offset+0]) <<    0)
+	     | (((uint64_t)buf[offset+1]) <<    8)
+	     | (((uint64_t)buf[offset+2]) << 0x10)
+	     | (((uint64_t)buf[offset+3]) << 0x18)
+	     | (((uint64_t)buf[offset+4]) << 0x20)
+	     | (((uint64_t)buf[offset+5]) << 0x28)
+	     | (((uint64_t)buf[offset+6]) << 0x30)
+	     | (((uint64_t)buf[offset+7]) << 0x38);
+}
+
+
+static inline
+void pk_u8(void * const bufp, const int offset, const uint8_t nv)
+{
+	uint8_t * const buf = bufp;
+	buf[offset] = nv;
+}
+
+#define pk_u8le(buf, offset, nv)  pk_u8(buf, offset, nv)
+
+static inline
+void pk_u16le(void * const bufp, const int offset, const uint16_t nv)
+{
+	uint8_t * const buf = bufp;
+	buf[offset+0] = (nv >>    0) & 0xff;
+	buf[offset+1] = (nv >>    8) & 0xff;
+}
+
+static inline
+void pk_u32le(void * const bufp, const int offset, const uint32_t nv)
+{
+	uint8_t * const buf = bufp;
+	buf[offset+0] = (nv >>    0) & 0xff;
+	buf[offset+1] = (nv >>    8) & 0xff;
+	buf[offset+2] = (nv >> 0x10) & 0xff;
+	buf[offset+3] = (nv >> 0x18) & 0xff;
+}
+
+static inline
+void pk_u64le(void * const bufp, const int offset, const uint64_t nv)
+{
+	uint8_t * const buf = bufp;
+	buf[offset+0] = (nv >>    0) & 0xff;
+	buf[offset+1] = (nv >>    8) & 0xff;
+	buf[offset+2] = (nv >> 0x10) & 0xff;
+	buf[offset+3] = (nv >> 0x18) & 0xff;
+	buf[offset+4] = (nv >> 0x20) & 0xff;
+	buf[offset+5] = (nv >> 0x28) & 0xff;
+	buf[offset+6] = (nv >> 0x30) & 0xff;
+	buf[offset+7] = (nv >> 0x38) & 0xff;
+}
+
+#endif