png2uri

#!/bin/sh
#
# png2uri version 1.0.1, July 4, 2012.
#
# NO COPYRIGHT RIGHTS ARE CLAIMED TO THIS SOFTWARE.
#
# To the extent possible under law, the author has waived all copyright and
# related or neighboring rights to this work. This work is published from
# the United States of America in 2012.
#
# This png2uri software may be used freely in any way.
#
# The source is the original work of the person named below.  No other person
# or organization has made contributions to this work.
#
# ORIGINAL AUTHORS
#     The following people have contributed to the code or comments in this
#     file.  None of the people below claim any rights with regard to the
#     contents of this file.
#
#     Glenn Randers-Pehrson <glennrp@users.sourceforge.net>
#
# png2uri is a command-line application that creates an HTML "img" tag on
# standard output containing a data URI in accordance with RFC-2397, from
# a PNG file or from a PNG datastream received from standard input.
#
# Usage: png2uri [-u|--uri_only] [file]
#
#        options: -u|--uri_only|--url_only: omit the surrounding "img" tag
#                 and only write the data URI.
#
# Requires /bin/sh and a uuencode(1) that takes the "-m" option to mean
# to encode in base64 according to RFC-3548.
#
# If you prefer a web-based converter or a java application, this isn't
# it. Use your search engine and look for "png data uri" to find one.
#

uri_only="false"

while true
do
case x$1 in
  x-u|x--ur*)
      uri_only="true"
      shift
      ;;
  x)
      # Convert standard input.
      case $uri_only in
         true)
            echo "data:image/png;base64,"
            uuencode -m ==== | grep -v ====
            ;;
         false)
            echo "<img alt=\"PNG\" title=\"PNG\" src=\"data:image/png;base64,"
            uuencode -m ==== | grep -v ====
            echo "\">"
            ;;
      esac
      exit
      ;;
  *)
      # Convert the named file.
      case $uri_only in
         true)
            echo "data:image/png;base64,"
            uuencode -m $1 ==== | grep -v ====
            ;;
         false)
            echo "<img alt=\"$1\" title=\"$1\" src=\"data:image/png;base64,"
            uuencode -m $1 ==== | grep -v ====
            echo "\">"
            ;;
      esac
      exit
      ;;
esac
done