Archive Format Misc & Block Layout Constants

Fundamental block sizes, binary encoding flags, checksum field offsets, and scaling factors.

Defines

	Name
	MPTAR_OCTAL_BINARY_FLAG High bit flag set in octal fields to indicate base-256 binary encoding.
	MPTAR_USTAR_HEADER_SIZE Byte size of a standard USTAR header block.
	MPTAR_BLOCK_SIZE Standard block layout size for tar archives.
	MPTAR_SPACE_CHECKSUM_VAL Pre-calculated checksum baseline for an empty checksum field (8 ASCII spaces).
	MPTAR_CHECKSUM_OFFSET Byte offset of the checksum field within the standard 512-byte header.
	MPTAR_CHECKSUM_LEN Byte length of the checksum field inside the header.
	MPTAR_CHECKSUM_END_OFFSET End offset of the checksum field (156).
	MPTAR_EOA_BLOCK_COUNT Number of trailing zero-filled blocks designating End-of-Archive (EOA).
	MPTAR_EOA_MARKER_SIZE Total marker size for archive termination (1024 bytes).

#define MPTAR_OCTAL_BINARY_FLAG 0x80U

High bit flag set in octal fields to indicate base-256 binary encoding.

#define MPTAR_USTAR_HEADER_SIZE 512

Byte size of a standard USTAR header block.

#define MPTAR_BLOCK_SIZE 512

Standard block layout size for tar archives.

#define MPTAR_SPACE_CHECKSUM_VAL 256

Pre-calculated checksum baseline for an empty checksum field (8 ASCII spaces).

#define MPTAR_CHECKSUM_OFFSET 148U

Byte offset of the checksum field within the standard 512-byte header.

#define MPTAR_CHECKSUM_LEN 8U

Byte length of the checksum field inside the header.

#define MPTAR_CHECKSUM_END_OFFSET (MPTAR_CHECKSUM_OFFSET + MPTAR_CHECKSUM_LEN)

End offset of the checksum field (156).

#define MPTAR_EOA_BLOCK_COUNT 2U

Number of trailing zero-filled blocks designating End-of-Archive (EOA).

#define MPTAR_EOA_MARKER_SIZE (MPTAR_EOA_BLOCK_COUNT * MPTAR_BLOCK_SIZE)

Total marker size for archive termination (1024 bytes).

Updated on 2026-07-23 at 20:07:34 +0000