File Heaps

A file heap is a type of heap that exists in a file. The file is treated as a contiguous, extendable, store, with a default cluster size of 16 bytes. The lowest offset of the file contains a header structure which defines how the heap is accessed.

type TFH_Header = packed record

Prefix : byte ;

Facility : byte ;

Version : byte ;

Reservedb : byte ;

Resolution : longint ;

Flags : longint ;

Reserved : longint ;

AT_Offset : int64 ;

Origin : int64 ;

end ;

Item	Description
Prefix	A value, that with the Facility value, indicates that this is a File Heap: FF
Facility	Indicates a file heap: 144 (decimal).
Version	File heap format version: 0
Reservedb	Reserved for future use. Should be 0.
Resolution	Resolution, in bytes, of allocation table (i.e. Cluster size). Default is 16 (decimal).
Flags	Reserved for future use. Should be 0.
Reserved	Reserved for future use. Should be 0.
AT_Offset	Byte offset in the file of the allocation table.
Origin	Byte offset in the file of the origin of the data stored in the heap.