zip2img

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#!/bin/sh
#      _        _____ _                 
#     (_)      / __  (_)                
#  _____ _ __  `' / /'_ _ __ ___   __ _ 
# |_  / | '_ \   / / | | '_ ` _ \ / _` |
#  / /| | |_) |./ /__| | | | | | | (_| |
# /___|_| .__/ \_____/_|_| |_| |_|\__, |
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#       |_|                       |___/ 
#
# Converts ZIP archives to MS-DOS compatible disk images (virtual floppies)
#
# Pablo (C) 2021

zip="$1"
img="$2"
dir="$(mktemp)"

if [ -z "$zip" ]
then
  echo 'zip2img zipfile [imagefile]'
  exit 0
fi

# Generate the default filename for the output if it isn't set by the user
if [ -z "$img" ]
then
  fname="$(echo "$zip" | sed 's/\.[^.]*$//g')"
  fdir="$(dirname "$zip")"
  img="$fdir/$fname.img"
fi

# Extract the contents of the archive to a temporary directory
unzip "$zip" -d "$dir/"

# Create the disk image and copy the contents of the archive to it
dd if=/dev/zero of="$img" count=1440 bs=1k
/sbin/mkfs.msdos "$img"
mcopy -i "$img" "$dir/"* ::/

# Delete the temporary directory
rm "${dir:?}" -rf