Adding test files and bash script/reference-output

test/data/png-test.out

@@ -0,0 +1,452 @@
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+ address | chunk |  length | data                           | checksum
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+  STRUCTURE OF TIFF FILE (MM): MemIo
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+        10 | 0x010e ImageDescription             |     ASCII |       17 |        74 | Can you read me?
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+
+Can you read me?
+
+040621-N-6536T-062
+USS Ronald Reagan (CVN 76), June 21, 2004 -  USS Ronald Reagan (CVN 76) sails through the Straits of Magellan on its way to the Pacific Ocean. The Navyís newest aircraft carrier is underway circumnavigating South America in transit to its new homeport of San Diego. U.S. Navy photo by Photographerís Mate 3rd Class (AW) Elizabeth Thompson. (RELEASE)
+                               
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+USS Ronald Reagan (CVN 76), June 21, 2004 -  USS Ronald Reagan (CVN 76) sails thr ...
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+USS Ronald Reagan (CVN 76), June 21, 2004 -  USS Ronald Reagan (CVN 76) sails thr ...
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+changed comment
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+1343_exif.png         Exif.Image.XResolution                       Rational    1  72
+1343_exif.png         Exif.Image.YResolution                       Rational    1  72
+1343_exif.png         Exif.Image.ResolutionUnit                    Short       1  inch
+1343_exif.png         Exif.Image.YCbCrPositioning                  Short       1  Centered
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+ReaganSmallPng.png    Exif.Image.Compression                       Short       1  Uncompressed
+ReaganSmallPng.png    Exif.Image.ImageDescription                  Ascii     403  040621-N-6536T-062
+USS Ronald Reagan (CVN 76), June 21, 2004 -  USS Ronald Reagan (CVN 76) sails thr ...
+ReaganSmallPng.png    Exif.Image.Make                              Ascii      18  NIKON CORPORATION
+ReaganSmallPng.png    Exif.Image.Model                             Ascii      10  NIKON D1X
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+ReaganSmallPng.png    Exif.Image.YResolution                       Rational    1  300
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+ReaganSmallPng.png    Exif.Image.Software                          Ascii      11  GIMP 2.9.5
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+ReaganSmallPng.png    Exif.Image.Artist                            Ascii      34  Photographerís Mate 3rd Class (A
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+ReaganSmallPng.png    Exif.Photo.DateTimeDigitized                 Ascii      20  2004:06:21 23:37:53
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+ReaganSmallPng.png    Iptc.Application2.BylineTitle                String     21  U.S Navy Photographer
+ReaganSmallPng.png    Iptc.Application2.Caption                    String    402  040621-N-6536T-062
+USS Ronald Reagan (CVN 76), June 21, 2004 -  USS Ronald Reagan (CVN 76) sails thr ...
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+ReaganSmallPng.png    Iptc.Application2.DigitizationTime           Time       11  23:37:53-04:00
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+ReaganSmallPng.png    Iptc.Application2.RecordVersion              Short       1  2
+ReaganSmallPng.png    Iptc.Application2.Source                     String     24  Navy Visual News Service
+ReaganSmallPng.png    Iptc.Application2.SpecialInstructions        String     49  Credit as U.S. Navy photo by Elizabeth Thompson. 
+ReaganSmallPng.png    Iptc.Application2.SuppCategory               String     12  703-614-9154
+ReaganSmallPng.png    Iptc.Application2.TimeCreated                Time       11  06:29:23-06:29
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+ReaganSmallPng.png    Xmp.dc.description                           LangAlt     1  lang="x-default" 040621-N-6536T-062
+USS Ronald Reagan (CVN 76), June 21, 2004 -  USS Ronald Reagan ( ...
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+ReaganSmallPng.png    Xmp.exif.WhiteBalance                        XmpText     1  Manual
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+ReaganSmallPng.png    Xmp.exif.Flash                               XmpText     0  type="Struct"
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test/png-test.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+# Test PNG support (-pS, -pc, -pa -c )
+
+source ./functions.source
+
+(   cd "$testdir"
+
+    files="1343_empty.png 1343_comment.png 1343_exif.png ReaganSmallPng.png"
+    copyTestFiles  $files
+    for  i in 1 2 ; do 
+        runTest exiv2 -pS   $files
+        runTest exiv2 -pc   $files
+        runTest exiv2 -pa   $files
+        runTest exiv2 -c  'changed comment' $files
+    done
+) > $results 2>&1
+
+reportTest
+
+# That's all Folks!
+##