PPMdCompressionSettings

Inheritance: java.lang.Object, com.aspose.zip.CompressionSettings

public class PPMdCompressionSettings extends CompressionSettings

Settings for PPMd compression within a ZIP archive.

PPMd is a data compression algorithm developed by Dmitry Shkarin. This algorithm is based on predictive phrase matching on multiple order contexts.

Constructors

Constructor	Description
PPMdCompressionSettings(int modelOrder, int suballocatorSize)	Initializes a new instance of the PPMdCompressionSettings class.
PPMdCompressionSettings()	Initializes a new instance of the PPMdCompressionSettings class with default model order and sub-allocator size.

Methods

Method	Description
getModelOrder()	Gets the order of the model.
getSuballocatorSize()	Gets the sub-allocator size in MB.

PPMdCompressionSettings(int modelOrder, int suballocatorSize)

public PPMdCompressionSettings(int modelOrder, int suballocatorSize)

Initializes a new instance of the PPMdCompressionSettings class.

 try (Archive archive = new Archive(new ArchiveEntrySettings(new PPMdCompressionSettings(4, 10)))) {
     archive.createEntry("data.bin", "data.bin");
     archive.save("zipFile.zip");
 }

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| modelOrder | int | Order of the model.

Bigger model orders almost surely results in better compression and surely more memory and CPU usage. |
| suballocatorSize | int | Memory size in MB suballocator may consume.

The PPMd algorithm might need a lot of memory, especially when used on large files and/or used with large model order. If ppmd needs more memory than you give it, the compression will be worse. |

### PPMdCompressionSettings() {#PPMdCompressionSettings--}

public PPMdCompressionSettings()

Initializes a new instance of the [PPMdCompressionSettings](../../com.aspose.zip/ppmdcompressionsettings) class with default model order and sub-allocator size.

     try (Archive archive = new Archive(new ArchiveEntrySettings(new PPMdCompressionSettings()))) {
         archive.createEntry("data.bin", "data.bin");
         archive.save("zipFile.zip");
     }
 
```

The default model order is 8, and the sub-allocator size is 50MB.

### getModelOrder() {#getModelOrder--}
```
public final int getModelOrder()
```


Gets the order of the model.

**Returns:**
int - the order of the model
### getSuballocatorSize() {#getSuballocatorSize--}
```
public final int getSuballocatorSize()
```


Gets the sub-allocator size in MB.

**Returns:**
int - the sub-allocator size in MB