The Random Books, Software, and Thoughts of Michael R Sweet

LPrint v1.4.0 June 08, 2026

LPrint v1.4.0 is a feature release that adds support for ESC/POS printers and several other printer models with existing drivers. Changes include:

• Added ESC/POS driver (Issue #123)
• Added Vevor Y428BT driver (Issue #130)
• Added 4 x 7.83 inch label size (Issue #144)
• Added Arkscan 2054a and HP KE103 (Issue #165)
• Added DYMO LabelWriter Twin Turbo driver (Issue #193)
• Now enable the TLS web interface unless the “no-tls” option is specified (Issue #161)
• Updated the default state file to match current PAPPL defaults (Issue #129)
• Updated the maximum label width of TSPL printers to 105mm (Issue #141)
• Updated the ZPL driver to automatically disable status commands if the target printer doesn’t implement that part of ZPL (Issue #161)
• Fixed the margins for DYMO printers (Issue #132)
• Fixed some Brother driver problems (Issue #167)
• Fixed a NumCopies issue in the TSPL driver (Issue #188)
• Fixed list of label sizes for DYMO LabelWriter 4XL (Issue #198)

Enjoy!

Download LPrint 1.4.0 Install lprint Snap Home Page

Comments
 

HP Printer Application v1.3.1 June 08, 2026

HP Printer Application v1.3.1 is a bug fix release. Changes include:

• Improved PCL compression code.
• Fixed CMYK output.
• Fixed a few PCL 6 output bugs.
• Fixed the --enable-experimental configure option to enable the PCL 6 driver.

Enjoy!

Download PAPPL v1.3.1 Home Page

Comments
 

PDFio 1.6.4 June 05, 2026

PDFio 1.6.4 is a bug fix release. Changes include:

• Fixed pdfioPageCopy implementation to not force a CropBox value (Issue #166)
• Fixed AES padding (Issue #167, Issue #169, Issue #170)

Enjoy!

Download PDFio v1.6.4 Home Page

Comments
 

PAPPL v1.4.11 June 05, 2026

PAPPL v1.4.11 is now available for download and is a bug fix release. Changes include:

• Updated the programmer’s manual (Issue #418, Issue #419)
• Updated Set-Printer-Attributes validations checks.
• Fixed builds on FreeBSD and other systems without a sys/statfs.h header (Issue #411)
• Fixed a deadlock issue in the USB gadget shutdown code (Issue #417)
• Fixed a truncation bug when decoding SNMP string values.
• Fixed the handling of the finishings option.

Enjoy!

Download PAPPL v1.4.11 Home Page

Comments
 

PDFio 1.6.3 April 30, 2026

PDFio 1.6.3 is a bug fix release. Changes include:

• Fixed pdfioPageCopy implementation to not copy the source document’s entire page tree (Issue #161)
• Fixed AES encryption dictionary name (Issue #163)
• Fixed AES owner key generation (Issue #164)
• Fixed support for empty UTF-16 strings (Issue #165)

Enjoy!

Download PDFio v1.6.3 Home Page

Comments
 

PDFio 1.6.2 February 15, 2026

PDFio 1.6.2 is a bug fix release. Changes include:

• Increased the maximum length of a single string to 128k (Issue #146)
• Added missing range checks to pdfioArrayCopy and pdfioDictCopy.
• Refactored PDF encryption code to fix unlocking with certain files.
• Improved xref table loop detection (Issue #148)
• Changed how duplicate objects are handled in PDF files (Issue #155)
• Fixed xref reconstruction for objects lacking a Type value.
• Fixed pdfioPageOpenStream for indirect Contents arrays.
• Fixed an error propagation bug when reading too-long values (Issue #146)
• Fixed a bug when converting Unicode characters above plane 0 (issue #159)
• Fixed a Clang warning.

Enjoy!

Download PDFio v1.6.2 Home Page

Comments
 

HTMLDOC 1.9.23 January 28, 2026

HTMLDOC 1.9.23 is a bug fix release. Changes include:

• Fixed a regression in list handling that caused a crash for empty list items (Issue #553)
• Fixed a regression in the number of rendered table of contents levels in PDF and PostScript output (Issue #554)

Binaries are available from Github for Windows 10+ and macOS 11+, and through the Snapcraft store for Linux.

Enjoy!

Download HTMLDOC 1.9.23 Install HTMLDOC 1.9.23 Snap Home Page

Comments
 

What is a Security Bug? January 13, 2026

I’ve had the privilege of working with a lot of security researchers throughout my career. Every one of them has been passionate about their work and the issues they report, and my work has greatly benefitted from their contributions.

Unfortunately, the software security industry has created an environment where CVEs (Common Vulnerabilities and Exposures) have become an economic driver. Researchers seem to increasingly need published CVEs or bug bounties to justify the time they spend trying to break software in new and interesting ways.

This has predictably led to more software bugs being reported as critical security vulnerabilities, with push-back and frustration from developers when those bugs are either not exploitable or not in that software at all! In addition, many issues are discovered and reported automatically (“AI”, “fuzzing”, etc.) without sufficient investigation/analysis by the reporter. Finally, security updates trigger an emergency response for everyone involved, causing further disruption to the software development process. Thus, it is important to clearly identify which bugs rate a CVE and which ones are ordinary bugs.

More + Comments
 

View All Posts