Programming: PNG, AArch64, Python and Tor
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Segfaults and Twitter monkeys: a tale of pointlessness
For a few years in the 1990s, when PNG was just getting established as a Web image format, I was a developer on the libpng team.
One reason I got involved is that the compression patent on GIFs was a big deal at the time. I had been the maintainer of GIFLIB since 1989; it was on my watch that Marc Andreesen chose that code for use in the first graphics-capable browser in ’94. But I handed that library off to a hacker in Japan who I thought would be less exposed to the vagaries of U.S. IP law. (Years later, after the century had turned and the LZW patents expired, it came back to me.)
Then, sometime within a few years of 1996, I happened to read the PNG standard, and thought the design of the format was very elegant. So I started submitting patches to libpng and ended up writing the support for six of the minor chunk types, as well as implementing the high-level interface to the library that’s now in general use.
As part of my work on PNG, I volunteered to clean up some code that Greg Roelofs had been maintaining and package it for release. This was “gif2png” and it was more or less the project’s official GIF converter.
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AArch64 support for ELF Dissector
After having been limited to maintenance for a while I finally got around to some feature work on ELF Dissector again this week, another side-project of mine I haven’t written about here yet. ELF Dissector is an inspection tool for the internals of ELF files, the file format used for executables and shared libraries on Linux and a few other operating systems.
[...]
ELF Dissector had its first commit more than six years ago, but it is still lingering around in a playground repository, which doesn’t really do it justice. One major blocker for making it painlessly distributable however are its dependencies on private Binutils/GCC API. Using the Capstone disassembler is therefore also a big step towards addressing that, now only the use of the demangler API remains.
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Weekly Python StackOverflow Report: (clxxxiii) stackoverflow python report
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denemo @ Savannah: Release 2.3 is imminent - please test.
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Arguments | Another way to work with user inputs – Part 7
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Call for setting up new obfs4 bridges
BridgeDB is running low on obfs4 bridges and often fails to provide users with three bridges per request. Besides, we recently fixed a BridgeDB issue that could get an obfs4 bridge blocked because of its vanilla bridge descriptor: <https://bugs.torproject.org/28655>
We therefore want to encourage volunteers to set up new obfs4 bridges to help censored users. Over the last few weeks, we have been improving our obfs4 setup guide which walks you through the process: <https://trac.torproject.org/projects/tor/wiki/doc/PluggableTransports/obfs4proxy>p>
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