Initial commit

print_barcode.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+printf '\x1Dk\x05'$1'\0' > /dev/usb/lp0

print_image.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+set -e
+dev=/dev/usb/lp0
+
+image="$(magick "$1" -resize 256x -dither FloydSteinberg -remap pattern:gray50 pbm:- | base64)"
+data_header="$(echo "$image" | base64 -d | sed -n '2p')"
+data="$(echo "$image" | base64 -d | tail -n +3 | base64)"
+
+hex_size() {
+    printf '%04x' "$1" | sed -e 's/\(..\)\(..\)/\\x\2\\x\1/g'
+}
+
+size="$(echo "$data" | base64 -d | wc -c)"
+size="$(hex_size "$(("$size" + 10))")"
+size_x="$(hex_size "$(echo "$data_header" | cut -d' ' -f 1)")"
+size_y="$(hex_size "$(echo "$data_header" | cut -d' ' -f 2)")"
+
+# Upload graphics data
+printf '\x1D(L' > $dev
+printf "$size" > $dev
+printf '\x30\x70\x30' > $dev
+printf '\x02\x02' > $dev  # bx, by (1 or 2)
+printf '\x31' > $dev  # color
+printf "$size_x" > $dev  # size x
+printf "$size_y" > $dev  # size y
+echo "$data" | base64 -d > $dev
+
+# Print graphics data
+printf '\x1D(L\x02\0\x30\x02' > $dev
+
+# Cut paper
+printf '\n\n\x1DVA\0' > $dev

print_qrcode.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+set -e
+dev=/dev/usb/lp0
+
+text="$1"
+size="$(printf '%s' "$text" | wc -c)"
+size="$(expr "$size" + 3)"
+size="$(printf '%04x' "$size" | sed -e 's/\(..\)\(..\)/\\x\2\\x\1/g')"
+
+# Store data
+printf '\x1D(k' > $dev
+printf "$size" > $dev
+printf '\x31\x50\x30' > $dev
+printf '%s' "$text" > $dev
+
+# Print data
+printf '\x1D(k' > $dev
+printf '\x03\0\x31\x51\x30' > $dev
+
+# Cut paper
+printf '\x1DVA\0' > $dev