POIFSConstants (POI API Documentation)

```
public interface POIFSConstants
```
A repository for constants shared by POI classes.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`BIG_BLOCK_MINIMUM_DOCUMENT_SIZE` The minimum size of a document before it's stored using Big Blocks (normal streams).
`static int`	`DIFAT_SECTOR_BLOCK` Indicates the sector holds a DIFAT block (0xFFFFFFFC)
`static int`	`END_OF_CHAIN` Indicates the sector is the end of a chain (0xFFFFFFFE)
`static int`	`FAT_SECTOR_BLOCK` Indicates the sector holds a FAT block (0xFFFFFFFD)
`static int`	`LARGER_BIG_BLOCK_SIZE` Some use 4096 bytes
`static POIFSBigBlockSize`	`LARGER_BIG_BLOCK_SIZE_DETAILS`
`static int`	`LARGEST_REGULAR_SECTOR_NUMBER` The highest sector number you're allowed, 0xFFFFFFFA
`static byte[]`	`OOXML_FILE_HEADER` The first 4 bytes of an OOXML file, used in detection
`static int`	`PROPERTY_SIZE` How big a single property is
`static byte[]`	`RAW_XML_FILE_HEADER` The first 5 bytes of a raw XML file, used in detection
`static int`	`SMALL_BLOCK_SIZE` How big a block in the small block stream is.
`static int`	`SMALLER_BIG_BLOCK_SIZE` Most files use 512 bytes as their big block size
`static POIFSBigBlockSize`	`SMALLER_BIG_BLOCK_SIZE_DETAILS`
`static int`	`UNUSED_BLOCK` Indicates the sector is not used (0xFFFFFFFF)

- Field Detail
  - SMALLER_BIG_BLOCK_SIZE
```
static final int SMALLER_BIG_BLOCK_SIZE
```
    Most files use 512 bytes as their big block size
    
    See Also:
    
    Constant Field Values
  - SMALLER_BIG_BLOCK_SIZE_DETAILS
```
static final POIFSBigBlockSize SMALLER_BIG_BLOCK_SIZE_DETAILS
```
  - LARGER_BIG_BLOCK_SIZE
```
static final int LARGER_BIG_BLOCK_SIZE
```
    Some use 4096 bytes
    
    See Also:
    
    Constant Field Values
  - LARGER_BIG_BLOCK_SIZE_DETAILS
```
static final POIFSBigBlockSize LARGER_BIG_BLOCK_SIZE_DETAILS
```
  - SMALL_BLOCK_SIZE
```
static final int SMALL_BLOCK_SIZE
```
    How big a block in the small block stream is. Fixed size
    
    See Also:
    
    Constant Field Values
  - PROPERTY_SIZE
```
static final int PROPERTY_SIZE
```
    How big a single property is
    
    See Also:
    
    Constant Field Values
  - BIG_BLOCK_MINIMUM_DOCUMENT_SIZE
```
static final int BIG_BLOCK_MINIMUM_DOCUMENT_SIZE
```
    The minimum size of a document before it's stored using Big Blocks (normal streams). Smaller documents go in the Mini Stream (SBAT / Small Blocks)
    
    See Also:
    
    Constant Field Values
  - LARGEST_REGULAR_SECTOR_NUMBER
```
static final int LARGEST_REGULAR_SECTOR_NUMBER
```
    The highest sector number you're allowed, 0xFFFFFFFA
    
    See Also:
    
    Constant Field Values
  - DIFAT_SECTOR_BLOCK
```
static final int DIFAT_SECTOR_BLOCK
```
    Indicates the sector holds a DIFAT block (0xFFFFFFFC)
    
    See Also:
    
    Constant Field Values
  - FAT_SECTOR_BLOCK
```
static final int FAT_SECTOR_BLOCK
```
    Indicates the sector holds a FAT block (0xFFFFFFFD)
    
    See Also:
    
    Constant Field Values
  - END_OF_CHAIN
```
static final int END_OF_CHAIN
```
    Indicates the sector is the end of a chain (0xFFFFFFFE)
    
    See Also:
    
    Constant Field Values
  - UNUSED_BLOCK
```
static final int UNUSED_BLOCK
```
    Indicates the sector is not used (0xFFFFFFFF)
    
    See Also:
    
    Constant Field Values
  - OOXML_FILE_HEADER
```
static final byte[] OOXML_FILE_HEADER
```
    The first 4 bytes of an OOXML file, used in detection
  - RAW_XML_FILE_HEADER
```
static final byte[] RAW_XML_FILE_HEADER
```
    The first 5 bytes of a raw XML file, used in detection

Interface POIFSConstants

Field Summary

Field Detail

SMALLER_BIG_BLOCK_SIZE

SMALLER_BIG_BLOCK_SIZE_DETAILS

LARGER_BIG_BLOCK_SIZE

LARGER_BIG_BLOCK_SIZE_DETAILS

SMALL_BLOCK_SIZE

PROPERTY_SIZE

BIG_BLOCK_MINIMUM_DOCUMENT_SIZE

LARGEST_REGULAR_SECTOR_NUMBER

DIFAT_SECTOR_BLOCK

FAT_SECTOR_BLOCK

END_OF_CHAIN

UNUSED_BLOCK

OOXML_FILE_HEADER

RAW_XML_FILE_HEADER