Xceed Zip for COM/ActiveX on x86/x64 Documentation
An absolute path is a complete path. It can start by a drive letter and colon or it can be a UNC format path. Examples of absolute paths are "C:\Data Files", "D:\" or "\\ComputerName\ShareName\Data Files". A path such as "graphics\256color\small" is not an absolute path. It is a relative path because the root portion is missing.
Advanced Encryption Standard. This standard, developed conjointly by the U.S. National Institute of Standards and Technology (NIST) and the international cryptographic community, specifies an encryption algorithm capable of protecting information well into the 21st century. It replaces the outdated Data Encryption Standard (DES). The Rijndael algorithm was selected as the finalist in the NIST's evaluation process after seeing submissions from 21 teams of cryptographers from 11 countries.
The BWT compression method is an implementation of the Burrows-Wheeler Transform compression algorithm with Huffman encoding. It was popularized by the UNIX and Linux BZip2 program.
It offers significantly better compression than Deflate (the traditional PKZIP 2.04g compression method) but takes longer to compress and decompress data. Xceed Software tests have shown BWT to often achieve between 20 to 30% better compression than Deflate on many popular file types such as databases, pictures, text and executable files.
BWT is considered to be one of the most efficient compression algorithms for compressing XML data.
Cyclic Redundancy Check. The CRC is a 32-bit checksum system that is used to verify the integrity of data.
The zip file format contains the 32-bit CRC of each file's original uncompressed data. When a file is unzipped, the CRC is calculated on the file's newly unzipped data and compared with the stored CRC of the original file.
If the CRCs are the same, then the unzipped file is very probably identical to the original file, because the 32-bit CRC is able to detect single bit variations even in the largest files.
The current directory is the folder from which an application was executed. An application's current directory can change depending on where it is installed or by which method is chosen to start it (it could be executed from a batch file, by double-clicking on its program icon, from a shortcut, etc.)
It is recommended that you do not rely on the applications current directory when specifying paths and files to process or exclude. Use the BasePath property instead.
The Deflate64™, also know as Enhanced Deflate, compression algorithm is a variation of the Deflate algorithm that uses a 64K sliding window rather than a 32K window in order to compress a sequence of bits.
Deflate64™ takes longer to compress data than Deflate, however it provides better compression. In comparison to BWT, Deflate64™ is slightly faster but does not compress as well.
Deflate64™ is a trademark of PKWARE Inc.
Deflate is the compression algorithm used by the PKZIP 2.04g file format. This algorithm provides good compression and is quite fast. It is the default compression algorithm used by Xceed Zip Compression Library.
Event-specific, user-provided code that is executed whenever the event is triggered. For example, if you want to play a sound whenever a button is clicked, you would write code to play the sound in the event handler for the button's click event.
A multi-part zip file is a zip file that is split into multiple files, all in the same folder. All the parts of a multi-part zip file usually have the same filename but with a different (numbered) filename extension. A multi-part zip file can be manually "converted" to a spanned zip file by placing each part on a separate floppy disk or other removable media and renamed to the same filename and filename extension. A conversion such as this, though, works only if each part of a multi-part zip file is small enough to fit on one disk, and is not guaranteed to take up all available space on a disk as when a spanned zip file is created by Xceed Zip Compression Library.
A relative path is a path that must be combined with a root path in order to make a complete (absolute) path. For example, "graphics\256color\small" is a relative path because it does not start by indicating a device or drive. "c:\users\fred\graphics\256color\small" is an absolute path.
A spanned zip file is a zip file that is split into multiple files, each located on a different floppy disk or other removable media. Spanned zip files are usually created directly to floppy disks or other removable media, in order to fill up each disk as much as possible or as specified. Spanned zip files allow a large zip file to be stored onto floppy disks or other removable media that normally would not fit.
The difference between a spanned zip file and a multi-part zip file is that a spanned zip file is created directly onto the target disks (each disk contains one file, always with the same filename) while a multi-part zip file is created into any target filesystem folder, with each part of the zip file having a different ( numbered) filename extension. A multi-part zip file can be copied to disks at a later time, but is not guaranteed to fit onto the disks nor to take up the optimal amount of space available on each disk.
Streaming data means data that is readable or obtainable only in a steady stream or in block portions of sequential data.
For example, a file's data arriving through modem is considered streaming data because you only get access to the data in a sequential fashion, as it becomes available.
A file already completely transferred is no longer streaming data – you can access the entire file at will.
Xceed Zip supports the * and ? wildcard characters. The * character matches a sequence of 0 or more characters. The ? character matches exactly one character.
Do not use "*.*" to match all files - you must use "*" instead. In the 32-bit Windows world, using *.* will only match files that contain a "." in them!
Use the ProcessSubfolders property to determine whether or not the contents of encountered sub-directories are also processed.
Wildcard matching is not case sensitive.
The Zip64 zip file format is the 64-bit counterpart of the zip file format that is used by PKZIP 4.5 and up. It supports up to 2^64 - 1 files within a zip archive as well as files that have a size greater than 4GB for a zip file size that can reach up to about 18 million terabytes (more precisely, 2^64 - 1 bytes).
More details here.