jdmichaud

Zig utils

• clap.zig: Command line argument
• draw.zig: Provide a canvas context 'like' interface for drawing
• io-adapter:
  • Keyboard/mouse input + graphic output
  • One adapter for SDL for now
• misc.zig:
  • Load a file
• Write an image (pgm or pam)

jdmichaud

# Compiler
CC = gcc

SANITIZEFLAGS=-fsanitize=address -fsanitize=undefined

# Compiler Flags
# -Wall -Wextra: Enable comprehensive warnings (recommended)
# -g: Include debugging symbols (for GDB)
# -std=c99: Specify C standard (or -std=c11, -std=gnu99 etc.)
# -O2: Optimization level (optional, use for release builds)

jdmichaud

// reference: https://popovicu.com/posts/789-kb-linux-without-mmu-riscv/

How to create a linux kernel that can run on a riscv32ima without an MMU.

• Download buildroot
• Untar it and start make menuconfig
• In Target Options
  • Target Architecture select RISCV
  • In Target Architecture Size select 32
• In Target ABI select ilp32

jdmichaud

# Some sane config values
EXTRACT_ALL           = YES
CLASS_DIAGRAMS        = YES
HIDE_UNDOC_RELATIONS  = NO
HAVE_DOT              = YES
CLASS_GRAPH           = YES
COLLABORATION_GRAPH   = YES
UML_LOOK              = YES
UML_LIMIT_NUM_FIELDS  = 50
TEMPLATE_RELATIONS    = YES

jdmichaud

ARTIFACTORY_DOMAIN=$(grep '^registry=' ~/.npmrc | awk -F'=' '{print $2}' | awk -F/ '{print $3}')
ARTIFACTORY_TOKEN=$(grep '^//${ARTIFACTORY_DOMAIN}' ~/.npmrc | \
  awk -F':' '{ print $2 }' | \
  awk -F'_auth=' '{ print $2 }' | \
  tr -d '"\r' | \
  base64 -d | \
  awk -F':' '{ print $2 }')

curl -H "Authorization: Bearer ${ARTIFACTORY_TOKEN}" \
     "https://${ARTIFACTORY_DOMAIN}/artifactory/api/storage/${PATH_TO_RESOURCE}?list&deep=1&listFolders=1&mdTimestamps=1" \

jdmichaud

// Broken implementation
function hash(s) {
  let hash = new Uint32Array(1);
  hash[0] = 0;
  for (let i = 0; i < s.length; ++i) {
    const c = s[i].charCodeAt(0);
    hash[0] += c;
    hash[0] += (hash[0] << 10);
    hash[0] ^= (hash[0] >> 6);
  }

jdmichaud

Check you display configuration:

xrandr

To clone your computer screen to a different output:

xrandr --output <TV> --same-as <computer-screen>

jdmichaud

rest
[ 9030.422503] xpad-dbg: 00000000: 00 00 0f 7f 7f 7f 7f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 9030.422526] xpad-dbg: 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

up
[ 9030.342505] xpad-dbg: 00000000: 00 00 0f 7f 00 7f 7f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 9030.342529] xpad-dbg: 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

down
[ 9054.410631] xpad-dbg: 00000000: 00 00 0f 7f ff 7f 7f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

jdmichaud

State of the art: https://safjan.com/tools-for-doc-deskewing-and-dewarping/#what-to-use-for-unwarping-and-deskewing

vFlap: android app

List of apps: https://graphicdesign.stackexchange.com/questions/30948/best-way-to-flatten-a-curled-photographed-book-photograph

Process used: https://discourse.devontechnologies.com/t/three-cheers-for-the-free-vflat-app-for-de-warping-iphone-photos-of-book-pages/72523

Scan tailor, a QT app to stragithened scanned pages. https://github.com/scantailor/scantailor

jdmichaud

Create a systemd service

Create a unit file in /etc/systemd/system named foo.service. Then:

sudo systemctl start foo

If the file is modified:

sudo systemctl daemon-reload