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[png2uri] Version 1.0.5, July 7, 2012: Eliminated use of "uname"
and use the return of "base64" and "uuencode" to select the workable one (checking "base64" first); suggested by John Bowler. Added a check for too many arguments, also a JB suggestion. Accept output filename as an optional final argument.
This commit is contained in:
Glenn Randers-Pehrson
83
png2uri
83
png2uri
@@ -1,6 +1,6 @@
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#!/bin/sh
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#
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# png2uri version 1.0.4, July 6, 2012.
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# png2uri version 1.0.5, July 7, 2012.
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#
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# NO COPYRIGHT RIGHTS ARE CLAIMED TO THIS SOFTWARE.
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#
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@@ -18,7 +18,8 @@
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# file. None of the people below claim any rights with regard to the
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# contents of this file.
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#
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# Glenn Randers-Pehrson <glennrp@users.sourceforge.net>
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# Glenn Randers-Pehrson <glennrp at users.sourceforge.net> is the author.
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# John Bowler <jbower at acm.org> contributed some useful suggestions.
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#
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# png2uri is a command-line application that creates an HTML "img" tag on
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# standard output containing a data URI in accordance with RFC-2397, from
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@@ -27,7 +28,7 @@
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# "--format" option or, if that option was not supplied, by inspection of the
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# filename extension.
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#
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# Usage: png2uri [-f type|--format type] [-u|--uri_only] [file]
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# Usage: png2uri [-f type|--format type] [-u|--uri_only] [infile [outfile]]
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#
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# options: -f|--format TYPE:
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# write "image/TYPE" instead of "image/png" in the
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@@ -42,24 +43,18 @@
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#
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# Requires /bin/sh and a "base64" or "uuencode -m" that encodes its input
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# in base64 according to RFC-3548 and writes the result on standard output,
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# "uname", and a working "sed".
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# and a working "sed".
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#
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# If you prefer a web-based converter or a java application, this isn't
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# it. Use your search engine and look for "data uri" to find one.
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#
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# I guess we need a "configure" script to figure out which of base64(1)
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# or uuencode(1) to use, since neither is always present (uuencode must
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# be installed as part of "sharutils" on Gnu/Linux platforms, which often
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# hasn't happened). Here is a minimal "configure":
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# This script figures out which of base64(1) or uuencode(1) to use, since
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# neither is always present (uuencode must be installed as part of "sharutils"
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# on Gnu/Linux platforms, which often hasn't happened).
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case X`uname` in
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XLinux)
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PNG2URI_BASE64=use_base64
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;;
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*)
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PNG2URI_BASE64=use_uuencode
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;;
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esac
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png2uri_encode(){
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base64 2>/dev/null || uuencode -m "====" 2>/dev/null | grep -v "===="
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}
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PNG2URI_FMT="unknown"
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PNG2URI_URI="true"
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@@ -110,26 +105,12 @@ case X$1 in
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case X$PNG2URI_URI in
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Xfalse)
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echo "data:$PNG2URI_FMT;base64,"
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case X$PNG2URI_BASE64 in
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Xuse_base64)
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base64
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;;
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Xuse_uuencode)
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uuencode -m ==== | grep -v ====
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;;
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esac
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png2uri_encode
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;;
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*)
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echo "<img alt=\"PNG\" title=\"PNG\" src=\"data:$PNG2URI_FMT;base64,"
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case X$PNG2URI_BASE64 in
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Xuse_base64)
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base64
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;;
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Xuse_uuencode)
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uuencode -m ==== | grep -v ====
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;;
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esac
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png2uri_encode
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echo "\">"
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;;
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esac
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@@ -138,12 +119,28 @@ case X$1 in
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*)
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# Convert the named file.
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# First make sure there weren't extra arguments
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case $# in
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1)
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: # OK, continue
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;;
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2)
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exec < "$1" > "$2"
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;;
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*)
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echo "png2uri: too many arguments: $*" >&2
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echo "usage: png2uri [options] [infile [outfile]" >&2
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exit 1
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;;
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esac
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case X$PNG2URI_FMT in
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Xunknown)
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PNG2URI_FMT=image/png
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extension=`echo $1 | sed "s/.*\.//"`
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png2uri_extension=`echo $1 | sed "s/.*\.//"`
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case X$extension in
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case X$png2uri_extension in
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Xjpeg|XJPEG|Xjpg|XJPG)
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PNG2URI_FMT=image/jpeg
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;;
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@@ -162,25 +159,11 @@ case X$1 in
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case X$PNG2URI_URI in
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Xfalse)
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echo "data:$PNG2URI_FMT;base64,"
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case X$PNG2URI_BASE64 in
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Xuse_base64)
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base64 < $1
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;;
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Xuse_uuencode)
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uuencode -m $1 ==== | grep -v ====
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;;
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esac
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png2uri_encode < "$1"
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;;
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*)
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echo "<img alt=\"$1\" title=\"$1\" src=\"data:$PNG2URI_FMT;base64,"
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case X$PNG2URI_BASE64 in
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Xuse_base64)
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base64 < $1
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;;
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Xuse_uuencode)
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uuencode -m $1 ==== | grep -v ====
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;;
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esac
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png2uri_encode < "$1"
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echo "\">"
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;;
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esac
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@@ -25,7 +25,7 @@
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or "--format" option or, if that option was not supplied, by inspection of
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the filename extension.
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Usage: png2uri [-f format|--format format] [-u|--uri_only] [file]
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Usage: png2uri [-f format|--format format] [-u|--uri_only] [infile [outfile]]
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options: -f|--format TYPE:
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write "image/TYPE" instead of "image/png" in the
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@@ -112,48 +112,25 @@
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of "sharutils", which often doesnn't happen. SunOS and FreeBSD don't
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supply "base64" so we use "uuencode" instead.
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Version 1.0.5, July 7, 2012:
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Eliminated use of "uname" and use the return of "base64" and "uuencode"
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to select the workable one (checking "base64" first); suggested by
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John Bowler. Added a check for too many arguments, also a JB suggestion.
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Accept output filename as an optional final argument.
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TO DO
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1. Test on various other platforms. I assume we'll soon find one that has
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neither "uuencode" nor "base64". The following have been tried
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Ubuntu 10.04 (uuencode output was folded to 60 characters)
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Linux glenn.rp 2.6.32-41-generic #91-Ubuntu SMP Wed Jun 13 11:43:55
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UTC 2012 x86_64 GNU/Linux
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Linux nancy.rp 2.6.32-41-generic #91-Ubuntu SMP Wed Jun 13 11:43:55
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UTC 2012 x86_64 GNU/Linux (uuencode not found. Fixed that with
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"sudo aptitude install sharutils", then finally fixed by using
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base64() instead of uuencode())
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Ubuntu 12.04 (uuencode not found but manpage for POSIX uuencode exists;
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base64 works)
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Linux scooby 3.0.0-22-generic #36-Ubuntu SMP Tue Jun 12 17:37:42 UTC 2012
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x86_64 x86_64 x86_64 GNU/Linux
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SunOS 5.10 (uuencode data is folded to 68 characters)
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Does not work with "base64"! Reconfigured png2uri to use "uuencode".
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on non-Linux platforms.
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SunOS freddy 5.10 Generic_147441-13 i86pc i386 i86pc
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SunOS blade 5.10 Generic_144488-12 sun4u sparc SUNW,Sun-Blade-2500
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Sunos 5.11 (uuencode data is folded to 68 characters)
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SunOS weerd 5.11 oi_151a4 i86pc i386 i86pc
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FreeBSD 8.0 (uuencode data is folded to 76 characters)
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"base64 not found"; use uuencode.
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FreeBSD shaggy.simplesystems.org 8.0-RELEASE-p1 FreeBSD 8.0-RELEASE-p1
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#1: Mon Dec 21 11:26:14 CST 2009
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zsh@shaggy.simplesystems.org:/usr/src/sys/i386/compile/GENERIC
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i386
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Red Hat? (uuencode not found but manpage for POSIX uuencode
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exists; worked when base64 was used instead of uuencode)
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Linux studio.imagemagick.org 2.6.18-308.4.1.el5xen #1 SMP Tue Apr 17
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17:49:15 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux
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Linux magick.imagemagick.org 3.4.4-3.fc17.x86_64 #1 SMP Tue Jun 26
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20:54:56 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
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Two other Redhat Enterprise platforms also worked with base64, but
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uuencode was not installed.
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Ubuntu 10.04 (using "base64")
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Ubuntu 12.04 (using "base64")
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SunOS 5.10 (using "uuencode")
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SunOS 5.11 (using "uuencode")
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FreeBSD 8.0 (using "uuencode")
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Redhat Gnu/Linux (using "base64")
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Redhat Enterprise (using "base64")
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2. Find out if the script works on Windows and Mac or can be modified to
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do so.
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