[png2uri] Use "====" instead of "base64" to recognize the first line

because "base64" could conceivably appear within the data string.
Also implemented -u, --uri_only option.

png2uri

@@ -0,0 +1,79 @@
+#!/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

png2uri-README.txt

@@ -0,0 +1,113 @@
+/*
+ png2uri
+
+ 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.
+
+ The 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, from a PNG file or 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.  A surprising number of machines that I've tried
+ (3 out of 9) don't have uuencode installed.
+
+ REFERENCES:
+    http://en.wikipedia.org/wiki/Data_URI_scheme
+
+    Masinter, L. "RFC 2397 - The "data" URL scheme",
+      Internet Engineering Task Force, August 1998
+
+    http://en.wikipedia.org/wiki/Base64
+
+    IETF, "RFC 3548 - The Base16, Base32, and Base64 Data Encodings",
+      July 2003.
+
+ OTHER IMPLEMENTATIONS
+
+ 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.
+
+ CHANGE LOG
+
+   Version 1.0.0, July 3, 2012:
+
+      Initial release.
+
+   Version 1.0.1, July 4, 2012:
+
+      The string "base64" could conceivably appear within the encoded data
+      and any line containing "base64" is removed; revised script to
+      use "====" instead to remove the first line of uuencode output.
+
+      Implemented "-u" and "--url_only" option.
+
+ TO DO
+
+ 1. Test on various platforms. The following have been tried
+
+    Ubuntu 10.04 (data is folded to 60 characters)
+       Linux glenn.rp 2.6.32-41-generic #91-Ubuntu SMP Wed Jun 13 11:43:55
+          UTC 2012 x86_64 GNU/Linux
+       Linux nancy.rp 2.6.32-41-generic #91-Ubuntu SMP Wed Jun 13 11:43:55
+          UTC 2012 x86_64 GNU/Linux (uuencode not found.  Fixed that with
+          "sudo aptitude install sharutils", then data folded to 60 chars)
+
+    Ubuntu 12.04 (FAILED: uuencode not found but manpage for POSIX uuencode
+    exists)
+       Linux scooby 3.0.0-22-generic #36-Ubuntu SMP Tue Jun 12 17:37:42 UTC 2012
+          x86_64 x86_64 x86_64 GNU/Linux
+
+    SunOS 5.10 (data is folded to 68 characters)
+       SunOS freddy 5.10 Generic_147441-13 i86pc i386 i86pc
+       SunOS blade 5.10 Generic_144488-12 sun4u sparc SUNW,Sun-Blade-2500
+
+    Sunos 5.11 (data is folded to 68 characters)
+       SunOS weerd 5.11 oi_151a4 i86pc i386 i86pc
+
+    FreeBSD 8.0 (data is folded to 76 characters)
+       FreeBSD shaggy.simplesystems.org 8.0-RELEASE-p1 FreeBSD 8.0-RELEASE-p1
+           #1: Mon Dec 21 11:26:14 CST 2009
+           zsh@shaggy.simplesystems.org:/usr/src/sys/i386/compile/GENERIC
+           i386
+
+    Red Hat? (FAILED: uuencode not found but manpage for POSIX uuencode
+    exists)
+       Linux studio.imagemagick.org 2.6.18-308.4.1.el5xen #1 SMP Tue Apr 17
+           17:49:15 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux
+       Linux magick.imagemagick.org 3.4.4-3.fc17.x86_64 #1 SMP Tue Jun 26
+           20:54:56 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
+
+ 2. This script can be trivially modified to support another image format
+ (e.g., change PNG to JPG and "image/png" to "image/jpeg" throughout).
+ To do: do that, via a "-f/--format jpg|jpeg|png|bmp|gif" option and by
+ inspecting the filename extension.
+
+ 3. Find out if the script works on Windows and Mac or can be modified to
+ do so.
+
+ 4. Make it work as a drag-and-drop application.
+
+ 5. But keep it simple!
+
+*/