Header

Overview

Header is a class in Aspose.Email FOSS for Python.

Header record at file offset 0 defining Compound File Binary (CFB) geometry and allocation chain entry points.

Name	Type	Access	Description
`sector_size`	`int`	Read	Is the size of a regular sector in bytes
`mini_sector_size`	`int`	Read
`header_signature`	`bytes`	Read	Stores the 8‑byte CFB file signature
`header_clsid`	`bytes`	Read	Holds the 16‑byte CLSID recorded in the header
`minor_version`	`int`	Read
`major_version`	`int`	Read
`byte_order`	`int`	Read	Is the byte‑order marker (typically 0xFFFE)
`sector_shift`	`int`	Read	Is the power‑of‑two shift used to compute sector size
`mini_sector_shift`	`int`	Read	Is the shift used to compute mini sector size
`reserved`	`bytes`	Read	Contains reserved bytes that must be zero
`number_of_directory_sectors`	`int`	Read	Is the count of directory sectors
`number_of_fat_sectors`	`int`	Read	Is the count of FAT sectors
`first_directory_sector_location`	`SectorNumber`	Read	Gives the sector index of the first directory sector
`transaction_signature_number`	`int`	Read	Stores the transaction signature for file consistency
`mini_stream_cutoff_size`	`int`	Read	Defines the size threshold for mini streams
`first_mini_fat_sector_location`	`SectorNumber`	Read	Is the sector index of the first mini FAT sector
`number_of_mini_fat_sectors`	`int`	Read
`first_difat_sector_location`	`SectorNumber`	Read	Gives the sector index of the first DIFAT sector
`number_of_difat_sectors`	`int`	Read	Is the count of DIFAT sectors
`difat`	`List[SectorNumber]`	Read	Is a list of sector numbers that compose the DIFAT