Crc-32 and Cat Software for Windows

CRC32 Static Library
$14.95 - Traction Software

CRC32 Static Library for Microsoft VC++ was produced to make your CRC checking operations quick & easy to implement seamlessly without the need for an external DLL

The CRC is a "digital fingerprint" of a file, With CRC32 you can "melt down" a huge 20 MB (or even much bigger) file to have a small, handy reference to it, a single 32-bit number like 7d9c42fb (hexadecimal notation) which would unambiguously reflect the entire contents of this huge file. Now if some changes to this file happened, no matter how small, maybe only a single wrong bit somewhere in the middle, a new CRC-32 calculation would yield a completely different reference number (say 3faa83bd). So there’d be no doubt about it - this is not the same file anymore. On the other hand if the reference number was still the same (7d9c42fb) you might be sure that the file hasn’t changed.

The algorithm of CRC32 is exactly the same as that internally used by PKZIP and WinZip; i.e. the CRCs calculated by PKZIP and CRC32 are identical. That’s another fine thing about CRC32 - it calculates compatible, widely used 32-bit checksums, not just any numbers. You can use the 'pkunzip.exe -vt filename.zip' command to see that PKZIP’s CRC-32 values of files stored inside the filename.zip are identical to that calculated by CRC32 for these files.

Though you can use CRC32 to calculate 32-bit checksums of any file the real strength and usefulness of CRC32 is in comparing Wave Sound Files to see if their non-silent music parts are identical. In particular CRC32 may come in handy when comparing two different extractions of a CD Digital Audio track to ensure that the performed digital copy is perfect.

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Sync
$0 - Zach Scrivena

Sync is a simple command-line utility for performing one-way directory or file synchronization.
It synchronizes the specified target to match the specified source. Only the target is modified.
Runs on any OS with the Java Runtime Environment (JRE 6+).
Sync is free and open source software written in Java and released under the GNU GPL license (version 3).

MAIN FEATURES:
* FLEXIBLE FILE-MATCHING: Match files by combinations of name, size, last-modified time, and CRC-32 checksum; by default, (name,size,time,crc) are used.
* FLEXIBLE FILE TIME COMPARISON: Specify a time-tolerance (in milliseconds) when matching files by their last-modified time.
* FILENAME FILTERS: Use multiple GLOB or REGEX filters for file/directory names or their relative pathnames.
* SIMULATION MODE: Sync can be run to simulate file operations, so that the target directory is not modified.
* UNATTENDED USAGE: With an appropriate choice of switches, Sync can be executed without user intervention.
* LOG FILE: Sync can generate log files with automatic timestamps for convenient record-keeping.

See for the latest version, screenshots, documentation, and other information.

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DC++ MP3 Finder
$0 - DCPlus MP3 Finder LLC

DC++ MP3 Finder is a FREE software based on the original DC++ open source application. It utilizes highly popular in Peer-to-Peer networks Direct Connect protocol that allows users to quickly search and share their files over the internet. DC++ MP3 Finder comes with improved user interface and optimized search functionality that will make your MP3 search much more efficient. DC++ MP3 Finder is designed to bring the best file sharing experience to its users.

DC++ MP3 Finder supports a list of advanced features as:
1. Has a very simple intuitive graphical user interface and very easy to use
2. Search for alternative download locations, that will dramatically increase your download speed
3. Performs automated integrity checking using SFV files to verify on-the-fly CRC-32 values for a downloaded file and compare it against the SFV file
4. Automatic resuming of broken and interrupted downloads
5. Handles automated connections and simultaneous connections with many hubs
6. Removes automatically duplicated shared files
7. Has ?Search Flood? detection facility, so if many searches will come over the short period of time an alert will be generated
8. Has built-in chat system, so you can freely talk to other online DC++ users
9. Multilingual support is available and fully configurable via XML files

Happy Sharing To Everyone!!!

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FastCRC Library
$29.95 - SlavaSoft Inc.

A fast, highly optimized implementation of popular checksum algorithms: CRC32, CRC16, CRC16C (CRC-CCITT). The library allows to calculate checksums for files, memory blocks, strings, blobs, streaming data. It is quick, flexible, easy to use. It supports 3 interfaces: FastCRC API (the API can be used as is, or it can be used to create wrappers for languages that can use DLL or LIB), C++ Interface (C++ wrapper classes to FastCRC API), and FastCRC Type Library (includes all declarations for accessing the functionality from programming languages that can reference a .TLB, such as VB 5.0, VB 6.0, VBA, etc). It allows static/dynamic linking. It has no external dependencies such as MFC DLLs, COM/DCOM or other component. The help file has C, C++ and Visual Basic examples showing how to add checksum calculations to Windows applications quickly and easily.

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HashTab
$0 - Beeblebrox.org

A windows shell extension which installs a new tab with file hash information. Includes MD5, SHA1 and CRC032. Also allows for easy hash comparison. Great for verifying downloads without requiring any external tools.

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WinCatalog Light
$0 - WinCatalog.com

WinCatalog Light is an easy to use yet powerful disk catalog software that can be used for cataloging disks and files. Using WinCatalog Light you can quickly find a needed file in your disk collection, even without inserting any removable disks into the drives. Our CD cataloger keeps the record of all files and folders stored on a disk and then uses this data to help find the needed files. WinCatalog Light supports various disk formats: CD, DVD, diskettes, hard drives, ZIP and jazz disks, removable and network drives, Memory Stick cards and any other storage devices, that can be accessed as drives in MS Windows environment. For better data representation WinCatalog Light scans Zip-archives contents and adds archives to the catalog, extracts mp3, html file descriptions when scanning a disk, and retrieves Audio CD track names from Internet. WinCatalog's main asset is the ability to access any disk's table of contents even if the disk is inaccessible at the moment. You can view the list of files and folders, examine their properties and descriptions, search files by various criteria. You can increase the search relevancy by associating with each file (folder, diska?¦) a set of keywords and a description that characterizes this item. WinCatalog features a built-in list of contacts. Use it to monitor whom of your friends or acquaintances you have given a certain disk. The lent disks are marked with a special icon.
Try WinCatalog Light - it is completely FREE!

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