sourcecode

handmade. minimalistic. no bloatware.

Welcome. This is a small collection of my C sourcecode for linux.
It's open. Feel free to download, check, use and comment:
Jörg Reinhard <info@finalmedia.de>

Framebuffer

• fbvnc_mod.tar.gz 11-Sep-2013 18:07 12K sha256sum:f0c42dfd39a3c94fbedaa505df34e8ad76ed93175aa6f4909782f10fd6107f62 A VNC Client for direct output to linux framebuffer device (fbdev). This is my modified version (german keyboard, mousewheel) of fbvnc from Ali Gholami Rudi (http://litcave.rudi.ir)
• fbyell.tar.gz 19-Sep-2013 18:01 2.6K sha256sum:4e221e7b7c2baac3344e3ecb03d83d22f620feb3db068837ea160365c6ce8aef Modified and optimized version of txt2fb. Tool for displaying ASCII Text on Framebuffer Devices, without opening /dev/fb0. Writing to stdout, so you can redirect to different device, or do multiscreen hack with ... | tee /dev/fb0 > /dev/fb1. This is modified by Ali Gholami Rudi (http://litcave.rudi.ir). really nice font zoom/scale function.
• txt2fb.tar.gz 13-Sep-2013 09:47 6.9K sha256sum:8da3a1b34e069fa905f5b3db5a2bbfd54c837a751843de969930946871554d13 Tool for displaying ASCII Text on Framebuffer Devices, without opening /dev/fb0. Writing to stdout, so you can redirect to different device, or do multiscreen hack with ... | tee /dev/fb0 > /dev/fb1
• ascii2fbdev.tar.gz 26-Feb-2014 19:12 109K sha256sum:a08867d5e6f6bd117774d995731f590b90087baf7eec58ffc6a65fb51791cf0e Ascii Char sequence (0 black/ 1 white) on stdin to stdout for framebuffer like /dev/fb0 in different resolutions and depths. Auto detecing newline!
• bit2fbdev.tar.gz 26-Feb-2014 19:12 58K sha256sum:8d63ce2e0f60e2a815498732c079357cfb1829a8b6a9e149c14b73c320cbe1d7 Binary Bit sequence (0 black/ 1 white) on stdin to stdout for framebuffer like /dev/fb0 in different resolutions and depths.
• unifont.tar.gz 11-Sep-2013 18:02 6.7M sha256sum:ecc074fcbe113b414d43913cd563dfc99b52495ab940529d17bac5af44bd42f4 A Mirror of unifont.hex file, including some scripts. Unifont.hex is a UTF-8 Bitmap Font

Audio

• sid2pcm.tar.gz 10-Sep-2014 01:54 10K sha256sum:77e0876088893a6c038a04a696558a0cf57a6e775cfdf0194f60fae5e96fd47e My hacked/modified version of TinySID 0.94 by T. Hinrichs and R. Sinsch, so it can be used as a filter (writes to stdout) at linux commandline. First parameter is your SID Music File (MOS Technology SID Soundchip 6581, used in Commodore C64 an C128 in the 1980s), output to stdout. Example Usage: sid2pcm [sid-file] > /dev/dspW (set samplerate first! 44.1 kHz, signed 16 bit little endianess,mono - e.g. using sox?), or via pipe to alsa: sid2pcm [sid-file] | aplay -c 1 -f s16_le -r 44100, or to pulseaudio: sid2pcm [sidfile] | pacat --format=s16le --rate=44100 --channels=1, or to file: sid2pcm [sid-file] > example.s16le.mono.pcm. You can also pipe to ffmpeg and encode to different audiocodecs like opus, mp3, aac, ogg. Example using opusenc, a tiny standalone opus encoder: sid2pcm [sidfile] | opusenc - --raw-bits 16 --raw-rate 44100 --raw-chan 1 --raw-endianness 0 --raw output.opus. This is imho a much more flexible solution then directly accessing via soundcard.o. For Sample SID-Files have a look at the famous High Voltage SID Collection (http://hvsc.de). Also have a look to this nice thing.
• tonegenerator.tar.gz 21-Jan-2015 14:50 4.3K sha25sum:6e7527956189805074a4fb80f9064845180a74ff519945db4945bf7fe67e6166 This is my small Stereo, Multiple Sinus-Tone-Generator - just Sinus and Noise. It generates a RAW PCM 48khz, Stereo, 16 Bit little endian bitstream at stdout. So you can use ./tonegenerator | aplay -c 2 -f s16_le -r 48k. Compiled and linked with dietlibc, your executable binary(!) is also ~4kb only. The Example code generates Sinus Tone at 440 Hz at 80% volume and 1200 Hz at 20% volume. Mixed together. You can specify volume of each tone and can add further frequencies or noise.

Dataprocessing

• ratio10.tar.gz 11-Sep-2013 18:43 666 sha256sum:53c4bb74e1187f48adab25424b983e130e67096ceb6ca4a86502fcb47ceefead Cloning stdin to stdout while calculate ratio beetween up- and downbits as output on stderr. It is used to calculate spreading/distribution of 0 or 1 in a binary-data stream. Every input-byte is analysed bitwise, meaning reading 8 bit, counting 1 and 0. Redirect stderr to datafile, so you can visualize spreading afterwards.
• xor.tar.gz 14-Sep-2013 15:39 2.3K sha256sum:b79743178b8863cbbac709f3bc15158e958ca45f3bff00c75f12f39069bfb29d A small XOR-Tee-Utility stdin/file/stdout for encryption test and education purposes. only use with data from a real/physical rng. also, try to find the bug(s) in xor2.c, responsible for resulting in a sequence of zeros, if keyfile is /dev/urandom and stdin < /dev/zero. (normally shouldnt result in a sequence of zeros)>
• bit2ascii.tar.gz 26-Feb-2014 17:59 859 sha256sum:d5491ebd1d52638fbf5015d337f4e88784cfbb2d04814ee5c5f717d909a06115 Binary Bit sequence on stdin to ascii bit sequence of character 0 or 1 on stdout.
• ascii2bit.tar.gz 26-Feb-2014 17:59 969 sha256sum:e7190f8fce5de50b176020fdbc39c7163f76dff6e716bc50e07d41ffdf575cab Ascii Char sequence of character 0 or 1 as bits on stdin to real binary bit sequence in little endian on stdout.

Graphics

• bit2pbm.tar.gz 11-Sep-2013 18:55 1.1K sha256sum:df822e2cfd7c81078740e9fced16abd93c76aae60e9a3190aa8c1f7e3ae1595a Transform any sort of binary datastream on stdin to an uncompressed(!) black/white PBM-image Type P1 (1024x768 Pixel) on stdout. You can edit in in a normal plain/text-editor afterwards.
• barnsley_fern.tar.gz 07-Jan-2014 13:45 2.0K sha256sum:30369ab3a20314bc8a587382768c29ffc93cf2d03e4639ce543fec6d83a95bfd Generating Barnsley Fern (Hausdorff-Konvergenz) as PBM Image at stdout. Also including an hacked version that generates SVG output with lot of squares. (Original Source by Paul Bourke and Jay Link coding for svgalib. 1988, http://paulbourke.net/fractals/ifs_fern_a). Another really beautiful implementation, only 538 bytes, directly written in postscript: barnsley_fern.ps (538 bytes) by Eric Wicklund, 1993

Experiments

• geonames_symlink_database.htm 01-Jul-2015 10:43 -- Howto build a smart and tiny geonames resolver (resolving name of point of interest, like a city or street, to geo coordinate) without using any database backend, cgi, php or any external service - just by using broken symlinks and gatling httpd.

Patches

• patches/gatling 30-Jul-2015 19:47 -- Collection of patches for gatling http daemon, version 0.13/0.14

Just For Fun

• bob.c

  89504e470d0a1a0a0000000d4948445200000086000000d204030000007d
  48a54300000012504c54450018000000000021b3555555ffd000ffffff0a
  d862600000000174524e530040e6d86600000001624b47440088051d4800
  0000e54944415468deedd94d0e82301040e16238002aeed5700183eefde1
  02c678ffab288bb6016b1962866a7c6fd932df8e42526388e883f226d611
  0323b5d11bbfd4b6bd1cc2c0503442e387bbed26823030b48d6c6e5bbaf1
  ab5b5b3968e7d60a0c0c0c0c8c80c1f705e3078df83f2e064672e3d41eb8
  6560a8b7818191d2f0cff72a47be2f1818da86200c8ce98dd9f659251c3f
  b70faf3130263772b727a88abc2f1818da46330c55a2731d030303e3cf0d
  be2f18df6bf8ebac85d0d8bc5c6c6160681b1e1a65bcb9bfc5c0503442c7
  6b115d331818698cac7b39500c6f60604c6f10757b00d663906f49ec072e
  0000000049454e44ae426082
  

Please link to this page via http://cafeface.de or http://reinhard.xyz.

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If you like this site, you will also like (much more) those sites: Felix von Leitner, Ali Gholami Rudi, D. J. Bernstein, Bruce Guenter, Uwe Ohse, Paul Bourke, Dmitry Marakasov (AMDmi3), Nayuki