zFILEMAP_ALLOCATION

Contains a map of what portions of the file are physically allocated versus what portions are sparse.

Service:File System Services (64-Bit)

Defined In:zPublics.h

Syntax

typedef struct zAllocationExtentElement_s
{
   QUAD   byteOffset;
   QUAD   lengthBytes;
} zAllocationExtentElement_s;

Fields

byteOffset: Specifies the starting byte offset in the file where this extent begins.
lengthBytes: Specifies the length (in bytes) of the extent.

Remarks

Each extent element identifies a starting offset and a length for an allocated portion of the file object. Every contiguously allocated portion of the file object is represented by exactly one extent list element. Unallocated or sparse portions of a file do not have an extent element returned for them.