+#define HEADER_END char end_field
+#define header_sizeof(type) offsetof(typeof(type), end_field)
+
+struct metadata_packet_header {
+ uint32_t magic; /* 0x75D11D57 */
+ uint8_t uuid[16]; /* Unique Universal Identifier */
+ uint32_t checksum; /* 0 if unused */
+ uint32_t content_size; /* in bits */
+ uint32_t packet_size; /* in bits */
+ uint8_t compression_scheme; /* 0 if unused */
+ uint8_t encryption_scheme; /* 0 if unused */
+ uint8_t checksum_scheme; /* 0 if unused */
+ HEADER_END;
+};
+