net.java.truevfs.comp.zip

Interface ZipFileParameters<E extends ZipEntry>

Type Parameters:

E - The type of the created ZIP entries.

All Superinterfaces:

ZipCharsetParameters, ZipEntryFactory<E>, ZipParameters

public interface ZipFileParameters<E extends ZipEntry>
extends ZipCharsetParameters, ZipEntryFactory<E>

Provides parameters for reading ZIP files.

Warning: This interface is not intended for public use - its API may change at will without prior notification!

Method Summary

Modifier and Type	Method and Description
boolean	getPostambled() Returns the flag for supporting postambles of arbitrary length.
boolean	getPreambled() Returns the flag for supporting preambles.

Methods inherited from interface net.java.truevfs.comp.zip.ZipCharsetParameters

getCharset

Methods inherited from interface net.java.truevfs.comp.zip.ZipEntryFactory

newEntry

Method Detail

getPreambled

boolean getPreambled()

Returns the flag for supporting preambles. If this method returns true, then a ZIP file is allowed to contain arbitrary data as its preamble before the actual ZIP file data. Self Extracting Archives typically use a preamble to store the application code that is required to extract the ZIP file contents.

If this method returns false, then a ZIP file must start with either a Local File Header (LFH) signature, a ZIP64 End Of Central Directory Record (EOCDR) signature or an End Of Central Directory Record (EOCDR) signature.

Returns:

The flag for allowing a preamble.

getPostambled

boolean getPostambled()

Returns the flag for supporting postambles of arbitrary length. If this method returns true, then a ZIP file is allowed to contain arbitrary data of arbitrary length as its postamble after the actual ZIP file data. Note that searching for an arbitrary length postamble can seriously degrade the performance when reading a false positive ZIP file, i.e. an arbitrary file which is not compatible to the ZIP File Format Specification, because then the entire file needs to get searched for an End Of Central Directory Record (EOCDR) signature. A valid use case are self extracting ZIP files with very large postambles to host the extraction code.

If this method returns false, then a ZIP file may still have a postamble, but it must not exceed 64KB size, including the End Of Central Directory record with the ZIP file comment. This causes the reading of a false positive ZIP file to fail fast.

Returns:

The flag for supporting postambles of arbitrary length.