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LinuxTex

tarta.

Goal

i did not the like the quality of the images MimeTeX produces, so I tried to write my own script that uses an existing latex installation. this is the first time i used the php scripting language ... so the entire script propably isn't implemented very smart ... suggestions welcome.

Solution

• Attach:linuxtex.php
• Attach:linuxtexnk.php - Some security modifications by Nils Knappmeier (see below)

as mentioned above you need a complete latex installation and the tool dvipng (or convert that comes with imagemagik, if you slightly adjust the script in line 131).

Discussion

the script assumes that you have a /pub/img/latex/ directory the webserver user has write permissions to.

• {$ latex formula $} , for inline equations, like \( a+b \) in latex
• {% label, latex formula %} , for \begin{math} like equations, EQ(label) can be used anywhere on the page as an anchor to the equation

put useful settings for these tags in your local.css or another appropriate place

• span.mathRef for the anchor to the equation
• img.formulaMath for equations with label, put a dotted line arround them or something
• img.inlineMath, gues what, for inline equations
• span.eqCount, for the little number behind labeled equations

See Also

See also MimeTeX.

History

• 11/22/04 first "release"
• 01/25/05 security enhancements by Nils Knappmeier

Comments & Bugs

bugs:

• where do the spaces in the name attribute of the anchor for the formulas come from, i had to remove the "" to make it work, not very nice
• the whole ref() is implemented pretty bad i guess ... suggestions welcome
• this definetly does not produce valid html
• this propably isn't very safe

Security modifications by Nils Knappmeier:

• I noticed that you could just read any file on the disk by doing a "{$ $/etc/passwd $ $}" for instance. The code I inserted modifies the tex-source, such that:
  • "/" is replaced by "\slash{}"
  • "$" is replaced by "\$"
  • Every command with parameters is as in \command{something} is replaced by \command{\nothing{}something} where \nothing{} does in fact do nothing (but it will scramble filenames)
• The problem is that you can never be sure to know all commands that open files somehow. But this way, all filenames in a function should be rendered useless, while all math formulars should still work.

Contributors

• JanSchumacher

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