SevenZipPPMdCompressionSettings
Inheritance: java.lang.Object, com.aspose.zip.SevenZipCompressionSettings
public final class SevenZipPPMdCompressionSettings extends SevenZipCompressionSettings
Settings for PPMd compression method within 7z archive.
Constructors
| Constructor | Description |
|---|---|
| SevenZipPPMdCompressionSettings(int maxOrder, int suballocatorSize) | Instantiates settings for PPMd compression method within 7z archive. |
| SevenZipPPMdCompressionSettings() | Instantiates settings for PPMd compression method within 7z archive with default model order and sub-allocator size. |
Methods
| Method | Description |
|---|---|
| getMaxOrder() | Gets the maximum order. |
| getMethod() | Gets compression or decompression method. |
| getSuballocatorSize() | Gets the sub-allocator size in MB. |
SevenZipPPMdCompressionSettings(int maxOrder, int suballocatorSize)
public SevenZipPPMdCompressionSettings(int maxOrder, int suballocatorSize)
Instantiates settings for PPMd compression method within 7z archive.
try (SevenZipArchive archive = new SevenZipArchive(new SevenZipEntrySettings(new SevenZipPPMdCompressionSettings(4, 32)))) {
archive.createEntry("data.bin", "data.bin");
archive.save("zipFile.zip");
}
Parameters:
| Parameter | Type | Description |
|---|---|---|
| maxOrder | int | Maximum order. |
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. |
SevenZipPPMdCompressionSettings()
public SevenZipPPMdCompressionSettings()
Instantiates settings for PPMd compression method within 7z archive with default model order and sub-allocator size.
try (SevenZipArchive archive = new SevenZipArchive(new SevenZipEntrySettings(new SevenZipPPMdCompressionSettings()))) {
archive.createEntry("data.bin", "data.bin");
archive.save("sevenZipFile.7z");
}
Default model order is 6 and sub-allocator size is 16MB.
getMaxOrder()
public final byte getMaxOrder()
Gets the maximum order.
Returns: byte - the maximum order
getMethod()
public SevenZipCompressionMethod getMethod()
Gets compression or decompression method.
Returns: SevenZipCompressionMethod - compression or decompression method
getSuballocatorSize()
public final int getSuballocatorSize()
Gets the sub-allocator size in MB.
Returns: int - the sub-allocator size in MB