Decompression is the process of expanding a compressed file to its original size and format. When transferring large amounts of data through protocols such as SFTP or FTP/S, files can be compressed to reduce transfer times and save bandwidth. Once received, these files must be decompressed to restore them to a usable form. This process ensures that the data is intact and accessible after transmission.
Decompression is usually automatically performed by the receiving system but can also be initiated manually if required. Not all files will be transferred in compressed formats. File transfer protocol (FTP) and managed file transfer (MFT) servers often support decompression and allow for the smooth handling of compressed files. This functionality is particularly useful when dealing with large datasets or complex file structures to ensure the transferred data is both efficient to transmit and accessible after the transfer.
Why decompress files?
Decompressing files returns the data to its original form. This allows users to access and use the information. The process is important after data is transferred through an FTP or MFT server. Compressed files often cannot be used as they are. Decompression makes the data readable and complete.
Other reasons to decompress files are to:
- Enable integration with other systems and processes
- Ensure the data is human-readable and accessible
- Improve accuracy in data handling post-transfer
- Restore the original file size and format
How file decompression works
File decompression is the process that restores data to its original form. It uses a codec that matches the compression method. This codec is made for the type of data being used. It helps make the file readable again after it has been sent or stored. Compression lowers file size by removing repeated parts or unnecessary content.
Lossless compression does not always require decompression before use. Lossy compression must use the original codec to restore parts of the file. The codec includes rules for how to rebuild the missing parts. It may add characters to text or assign colors to pixels. The program uses these rules to fill in the gaps. This makes the file whole again for viewing or use.
The overall steps in this process are:
- A file is compressed using a particular format and codec
- The compressed file is transmitted to the recipient
- The file recipient’s application checks the compression status
- Lossless compression formats will be opened as received
- Lossy compression formats will require the recipient’s application to decompress and open the file according to the codec requirements
Benefits of on-the-fly decompression
On-the-fly decompression lets data be unpacked while it is being received. It does not wait until the full file finishes transferring. This approach lowers the amount of storage needed during the process. It also helps the transfer finish faster. It works well for large files or slow network speeds.
Other benefits of on-the-fly decompression are that it:
- Enhances system performance by avoiding unnecessary file storage
- Improves bandwidth efficiency by decompressing in real time
- Minimizes delays associated with large files
- Reduces storage requirements during transfer
- Speeds up file transfer by decompressing during the receiving portion of the process
On-the-fly decompression optimizes file transfer speed and storage efficiency while reducing delays in the process.
File decompression methods
File decompression methods vary based on the algorithm that’s used to compress the data. Each method uses a different approach to expand the compressed data back to its original form. Some methods are faster but less efficient in terms of file size, while others are slower but offer higher compression ratios.
Some common decompression methods are:
- Arithmetic coding: Provides better compression ratios in certain scenarios
- Burrows-Wheeler transform: Often used in bzip2 compression
- Huffman coding: A lossless method used for file formats like ZIP
- Lempel-Ziv-Welch (LZW): Common in GIF and TIFF files
- Run-length encoding: Efficient for data with many repeated elements
These methods differ in efficiency, speed and the type of data they handle best, so it’s important to select the right one based on your organization’s needs and use cases.
Common decompression file formats
Compression programs use a number of file formats for decompression, including:
- 7z: A format known for its high compression capabilities and support for various algorithms
- GZIP: Often used in UNIX-based systems for compressing single files
- RAR: A proprietary format that offers high compression ratios
- TAR: Commonly used with GZIP or BZIP2 for packaging multiple files
- ZIP: A popular format that supports lossless compression
These formats vary in compression efficiency, speed and compatibility and should be considered based on how many files your organization wants to package, whether you desire using lossless or lossy compression and your operating system.
File decompression FAQs
Decompressing a file puts it back to normal. The file goes back to the way it was before. Organizations do this when they need to use a file that was made smaller. The smaller size helped with saving space and sending it faster. Before you can open it, you often need to do this step. However, some servers can do it by themselves.
Compression changes file format and structure, which means that files can’t be used by their usual programs until restored through decompression. This process lets the file’s original applications read and manipulate the data. An FTP or MFT server may not need to decompress a file for transfer or storage, but it must do so to make the file user-accessible.
File compression makes a file smaller by taking out extra parts. This helps save space and speeds up sharing. The process uses algorithms to change how the file is stored. Lossless compression keeps all important parts but removes things not needed for viewing. Lossy compression takes out more data and uses a codec to fill in the gaps. Many organizations compress files to move them faster and use less storage.
File decompression brings the file back to its full size. This step is needed before you can use the file. Most software cannot open files that are still compressed. Decompression can happen by itself. You can also start it manually after receiving the file.
Decompression usually takes less time than compression. Compression looks for patterns in the data to make the file smaller. Decompression just has to undo that process and return the file to its full size. This step uses less computing power and often finishes faster.
How fast each step runs depends on the file’s size and how complex the method is. Compression needs more steps because it checks and reshapes the data. Decompression has fewer steps. That makes it a quicker task in many cases.
