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ZipForge is a fast and powerful VCL Zip component, written in Delphi.
It lets you easily create ZIP archives, extract files from zip files to hard drive or memory, add files to a zip archive from disk or memory, replace, move and delete files in zip archives. Also it creates and reads self-extracting (SFX) zip archives, AES encrypted and multi-volume zip files.

Features:

ZIP compatibility

Fully PKZIP 4.5 compatible format
Password protection
ZIP compatible self extracting archives (SFX)

Speed

Special tuning for compression algorithms implementations
One of the fastest Deflate implementations available today
Transaction system optimizing a group of archive modifications

Functionality

Adds, moves, extracts, deletes, updates, tests, refreshes a group of files by a single operation
Save/Load zipped data from stream
Add compressed data from stream / Extract to stream
Supports in-memory archives
Compresses large files with low memory consumption
Provides compression for files, buffers, streams and strings
Stores archives in TStream descendant objects like BLOB streams
Repairs and opens corrupted archives
Zip64 format is supported
Strong AES Encryption with 128, 192 and 256 bit keys
Unicode filenames are supported
Supports archives up to 2^63 bytes, compresses and decompresses files up to 2^63 bytes
Creates multi-disk spanning archive
Splits archive to multiple volumes

Convenience

Native VCL; no DLLs; no OCXs
Well-designed component interface
Progress indication with possibility to cancel operation
Lots of useful events such as OnOverwritePrompt, OnNeedPassword, OnProcessFileFailure, etc.

Ease of use

Comprehensive help
Lots of demos
Easy-to-use interface provided by a single component
Source code available