pdftexcmd: Checksum Computation

[manuel-kuehner]

It's about the checksum computation in pdftexcmd that is apparently different for LaTeX and LuaTeX as reported in https://tex.stackexchange.com/questions/219199.

I am not an expert - I only "suffer" from the problem that seems to be a couple of years old now.

The problem seems to be Windows specific.

[agrahn]

Below, there is a simple test file (with zero pages output).

Run pdflatex and lulatex on it. It writes the MD5 checksum of the test file to the terminal and into the log file. The checksums should be the same for pdfLaTeX and for LuaLaTeX and be equal to the output of the md5sum Unix command.

On Windows platform the checksum calculated by LuaLaTeX is wrong, because in file texmf-dist/scripts/oberdiek/pdftexcmds.lua, in the md5sum implementation, input files are opened in text mode. They should rather be opened in binary mode. The suggested patch in https://tex.stackexchange.com/a/222272 fixes this for all platforms.

Test file:

\documentclass{article}

\usepackage{pdftexcmds}

\begin{document}

\makeatletter
\typeout{++++++++++++++ md5checksum ++++++++++++++}
\typeout{\pdf@filemdfivesum{\jobname.tex}}
\typeout{++++++++++++++ md5checksum ++++++++++++++}
\makeatother

\end{document}

[davidcarlisle]

yes thanks I've made the change locally, not committed yet as the build fails elsewhere in the bundle unrelated to this package (documentation failing with a biblatex change) I'll commit and push to github once that is resolved. thanks for identifying the issue here.

On 24 January 2018 at 20:54, agrahn notifications@github.com wrote:

Bellow, there is a simple test file (with zero pages output).

Run pdflatex and lulatex on it. It writes the MD5 checksum of the test file to the terminal and into the log file. The checksums should be the same for pdfLaTeX and for LuaLaTeX and be equal to the output uf the md5sum Unix command.

On Windows platform the checksum calculated by LuaLaTeX is wrong, because in file texmf-dist/scripts/oberdiek/pdftexcmds.lua, the files are opened in text mode. They should rather be opened in binary mode. The suggested patch in https://tex.stackexchange.com/a/222272 fixes this for all platforms.

Test file:

\documentclass{article} \usepackage{pdftexcmds} \begin{document} \makeatletter\typeout{++++++++++++++ md5checksum ++++++++++++++}\typeout{\pdf@filemdfivesum{\jobname.tex}}\typeout{++++++++++++++ md5checksum ++++++++++++++}\makeatother \end{document}

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[agrahn]

Wow, this was really fast. Thank you, David!

[manuel-kuehner]

Copy and Paste: Wow, this was really fast. Thank you, David!

[davidcarlisle]

this is now on ctan, thanks for the report.