Structure
The CFBF file consists of a 512-Byte header record followed by a number of sectors whose size is defined in the header. The literature defines Sectors to be either 512 or 4096 bytes in length, although the format is potentially capable of supporting sectors ranging in size from 128-Bytes upwards in powers of 2 (128, 256, 512, 1024, etc.). The lower limit of 128 is the minimum required to fit a single directory entry in a Directory Sector.
There are several types of sector that may be present in a CFBF:
- File Allocation Table (FAT) Sector - contains chains of sector indices much as a FAT does in the FAT/FAT32 filesystems
- MiniFAT Sectors - similar to the FAT but storing chains of mini-sectors within the Mini-Stream
- Double-Indirect FAT (DIFAT) Sector - contains chains of FAT sector indices
- Directory Sector - contains directory entries
- Stream Sector - contains arbitrary file data
- Range Lock Sector - contains the byte-range locking area of a large file
More detail is given below for the header and each sector type.
Read more about this topic: Compound File Binary Format
Famous quotes containing the word structure:
“Man is more disposed to domination than freedom; and a structure of dominion not only gladdens the eye of the master who rears and protects it, but even its servants are uplifted by the thought that they are members of a whole, which rises high above the life and strength of single generations.”
—Karl Wilhelm Von Humboldt (1767–1835)
“In the extent and proper structure of the Union, therefore, we behold a republican remedy for the diseases most incident to republican government.”
—James Madison (1751–1836)
“Just as a new scientific discovery manifests something that was already latent in the order of nature, and at the same time is logically related to the total structure of the existing science, so the new poem manifests something that was already latent in the order of words.”
—Northrop Frye (b. 1912)