Convert GZIP Files to POTM in Java

What is GZIP file format?

A GZIP file is a compressed archive that uses the GNU zip compression algorithm to reduce the size of one or more files. The GZIP file format is widely used on Unix-based systems and can be created and manipulated using command-line utilities like gzip or gunzip. The GZIP file format includes metadata about the compressed data, such as the original file name, timestamp, and permissions. This makes it a versatile and efficient way to archive files or transfer data over the internet. GZIP files can be opened using a variety of software tools, including popular file archivers like WinZip, 7-Zip, and WinRAR. Additionally, GZIP files can be easily decompressed using command-line utilities or programming libraries available on most platforms. The compression algorithm used by GZIP, DEFLATE, is specified in RFC 1951, while the GZIP file format itself is specified in RFC 1952. Overall, GZIP files are a widely used and reliable compression format that can be used for a variety of applications, including data transfer, backup, and archiving.

What is POTM file format?

A POTM file refers to a macro-enabled presentation template created using Microsoft PowerPoint, a software program used for creating slide show presentations. It includes default images, slide templates, macros, and formatting. POTM files are commonly used by PowerPoint users to create multiple .PPTM files with consistent designs and macro settings.

POTM files offer additional functionality compared to typical presentation files, as they support macros. Macros are script-like functions that automate repetitive tasks within PowerPoint. Users can record macros that can be replayed to perform specific actions and assign them to buttons or keystrokes for convenient execution. To record a macro, users can select View → Macros in PowerPoint.

For general presentation creation, users can save their files as .PPTX or .POTX files. However, if they want to create a template that incorporates macros, they can save their presentation as a POTM file.

It’s worth noting that POTM files were introduced by Microsoft when they released Microsoft Office 2007.

To open a POTM file, Microsoft PowerPoint (2007 or later) is the recommended application for full support of presentation formatting and embedded macros on both Windows and macOS. Alternative applications like Apache OpenOffice Impress, Kingsoft Presentation, and Apple Keynote can also open POTM files, but some formatting and macros may not be fully preserved. For Mac users looking to view a POTM file without editing, Apple Preview (bundled with macOS) or Google Drive, a free cloud storage service, can be used.

Online platforms like Google Slides allow users to upload POTM files for viewing, editing, and conversion. However, it’s important to note that Google Slides does not support macros.

To convert a POTM file, various presentation applications including Microsoft PowerPoint, Apple Keynote, and OpenOffice Impress offer conversion capabilities. In Microsoft PowerPoint for Windows and Mac, users can select File → Save As and choose from formats such as .PPTX, .PPT, .PDF, .ODP, .XPS, .MP4, .WMV, .JPEG, and .PNG to convert the POTM file to their desired format.