#PKWARE COMPRESSION ZIP FILE#
#PKWARE COMPRESSION CODE#

I really don't know why this is and haven't been able to improve the performance of the Java version. Encrypting a 16meg file on the C# version takes 2-3 Seconds, the same file on the Java version takes 2-3 minutes. I don't know why but the C# version performs much (really loads) better than the java version when encryption is involved. apart from that the two libraries are pretty similar. This meant a lot of & 0xFFFF etc style bit masking. UInt16 (2 byte) in java is replaced with long (4 bytes). in places I have just used the signed equivalents (this is pretty dangerous) and in others I have used the signed version up i.e. You can see from the source that the C# version is a lot easier to write/code than the Java version as it uses properties instead of getter and setter methods (yes I know the CLR uses getters and setters in the background!! but that's hidden from me in c# yeah!!)Р”Р„lso Java does not support unsigned data types, which to be honest was a bit of a pain. Those files can have different compression methods and passwords to other files.

#PKWARE COMPRESSION ZIP FILE#

Note the Add File (file) method can be called multiple times to add as many file to the ZIP File as you like. the file will be compressed using the deflate algorithm (note this is the only algorithm the library supports) and the file will also be encrypted with the supplied password.Р”Р‡ileEntry file = new FileEntry( 'D:\text.txt', 'HARPER',Method.Deflated) the file will be compressed using the deflate algorithm (note this is the only algorithm the library supports)Р”Р‡ileEntry file = new FileEntry( 'D:\text.txt',Method.Deflated) Р”В¬reating a ZIP file with one file in it, using deflate compression and encrypted with a password Add the FileEntry object to the ZIPFile objectР”В¬reating a ZIP file with one file in it, using Deflate compression without a password. the file will NOT be compressed or have a passwordР”Р‡ileEntry file = new FileEntry( ' D:\text.txt' ,Method.Stored) Creates a FileEntry object that represents the file D:\text.txt

ZIPFile zip = new ZIPFile( 'D:\myfirstZip.zip') Creates a ZipFile object that will ultimately be saved at D:\myfirstZip.zip This is controlled by the constructor called to create the File Entry.Р”В¬reating a ZIP file with one file in it, using Stored (i.e. The File Entry can be stored as is, compressed, as is encrypted, compressed encrypted. text files, jpegs anything (I think.).Р”Р‡ile Entry: This object represents a file stored inside a ZIP File.

ZIP File: This object represents a ZIP file, which can contain one or more other files (i.e. There are only really two main classes on interest:

#PKWARE COMPRESSION CODE#

This article provides the source code for creating zip files in C# and Java.

Pkware compression