ZstdUtils

java.lang.Object
- org.apache.commons.compress.compressors.zstandard.ZstdUtils

```
public class ZstdUtils
extends java.lang.Object
```
Utility code for the Zstandard compression format.
This class avoids making the underlying zstd classes part of the public or protected API. The underlying implementation is provided through the Zstandard JNI library which is based on zstd.

Since:

1.16

See Also:

Zstandard JNI, zstd

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static boolean`	`isZstdCompressionAvailable()`	Are the classes required to support Zstandard compression available?
`static boolean`	`matches(byte[] signature, int length)`	Checks if the signature matches what is expected for a Zstandard file.
`static void`	`setCacheZstdAvailablity(boolean doCache)`	Sets whether to cache the result of the Zstandard for Java check.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - isZstdCompressionAvailable
```
public static boolean isZstdCompressionAvailable()
```
    Are the classes required to support Zstandard compression available?
    
    Returns:
    
    true if the classes required to support Zstandard compression are available
  - matches
```
public static boolean matches(byte[] signature,
                              int length)
```
    Checks if the signature matches what is expected for a Zstandard file.
    
    Parameters:
    
    signature - the bytes to check
    
    length - the number of bytes to check
    
    Returns:
    
    true if signature matches the Ztstandard or skippable frame magic bytes, false otherwise
  - setCacheZstdAvailablity
```
public static void setCacheZstdAvailablity(boolean doCache)
```
    Sets whether to cache the result of the Zstandard for Java check.
    This defaults to false in an OSGi environment and true otherwise.
    
    Parameters:
    
    doCache - whether to cache the result