Compression Attribute
On NTFS volumes, each file and directory has a
compression attribute. Other file systems may also implement a compression attribute for individual
files and directories.
You can determine whether a file system supports a compression attribute for
files and directories by calling the
GetVolumeInformation function and examining the FS_FILE_COMPRESSION bit flag.
Use the
GetFileAttributes or
GetFileAttributesEx function to determine the compression attribute of a file or directory.
If a file's compression attribute is set, all of the data in the file is
compressed. If the attribute is clear, none of the data in the file is compressed.
There is no partially compressed state. The compression attribute is a simple
Boolean indicator of compression state.
A directory's compression attribute provides a default compression attribute
for newly created files and subdirectories. When you call
CreateFile or
CreateDirectory to create a new file or directory, the new file or directory inherits the
compression attribute of its parent directory.
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