Revert "Revert "fix_1431_binary_comment.""

This reverts commit 2866415.

Author: clanmills

src/value.cpp

@@ -555,18 +555,6 @@ namespace Exiv2 {
         return os << comment();
     }
 
-    // test string for printable ascii-7 (' ' .. '~')
-    static bool isBinary(const std::string& s)
-    {
-        bool result = false ;
-        size_t i = 0;
-        while ( !result && i < s.length() ) {
-            unsigned char c = (unsigned char) s[i++];
-            result = c < 32 || c > 127 ;
-        }
-        return result;
-    }
-
     std::string CommentValue::comment(const char* encoding) const
     {
         std::string c;
@@ -583,11 +571,6 @@ namespace Exiv2 {
         if ( bAscii && c.find('\0') != c.std::string::npos) {
             c = c.substr(0,c.find('\0'));
         }
-        // return "binary comment" if results contains non-printable bytes
-        // this ensures no binary bytes in the output stream.
-        if ( bAscii && isBinary(c) ) {
-            c = "binary comment" ;
-        }
         return c;
     }
 

test/data/exiv2-bug528.jpg

@@ -30,7 +30,7 @@ class TypeSizeForExifOnly(metaclass=system_tests.CaseMeta):
 Exif.Image.YCbCrPositioning                  Short       1  Centered
 Exif.Image.Rating                            SLong       1  3
 Exif.Image.RatingPercent                     SLong       1  50
-Exif.Image.ExifTag                           Long        1  318
+Exif.Image.ExifTag                           Long        1  320
 Exif.Photo.ExposureTime                      Rational    1  1/250 s
 Exif.Photo.FNumber                           Rational    1  F11
 Exif.Photo.ExposureProgram                   Short       1  Auto
@@ -46,10 +46,10 @@ class TypeSizeForExifOnly(metaclass=system_tests.CaseMeta):
 Exif.Photo.Flash                             Short       1  No, compulsory
 Exif.Photo.FocalLength                       Rational    1  10.0 mm
 Exif.Photo.MakerNote                         Undefined  18  0 1 2 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0
-Exif.MakerNote.Offset                        Long        1  796
+Exif.MakerNote.Offset                        Long        1  798
 Exif.MakerNote.ByteOrder                     Ascii       3  MM
 Exif.Canon.0x0200                            0x0300      0  
-Exif.Photo.UserComment                       Undefined  37  charset=Ascii binary comment
+Exif.Photo.UserComment                       Undefined  38  Chateaux de la Loire, Chambord
 Exif.Photo.SubSecTime                        Ascii       3  81
 Exif.Photo.SubSecTimeOriginal                Ascii       3  81
 Exif.Photo.SubSecTimeDigitized               Ascii       3  81
@@ -66,7 +66,7 @@ class TypeSizeForExifOnly(metaclass=system_tests.CaseMeta):
 Exif.Photo.SceneCaptureType                  Short       1  Standard
 Exif.Photo.Contrast                          Short       1  Normal
 Exif.Photo.Saturation                        Short       1  Normal
-Exif.Image.GPSTag                            Long        1  867
+Exif.Image.GPSTag                            Long        1  870
 Exif.GPSInfo.GPSVersionID                    Byte        4  2.0.0.0
 Exif.GPSInfo.GPSLatitudeRef                  Ascii       2  North
 Exif.GPSInfo.GPSLatitude                     Rational    3  47deg 36' 58"
@@ -75,7 +75,7 @@ class TypeSizeForExifOnly(metaclass=system_tests.CaseMeta):
 Exif.GPSInfo.GPSAltitudeRef                  Byte        1  Above sea level
 Exif.GPSInfo.GPSAltitude                     Rational    1  86 m
 Exif.Thumbnail.Compression                   Short       1  JPEG (old-style)
-Exif.Thumbnail.JPEGInterchangeFormat         Long        1  1055
+Exif.Thumbnail.JPEGInterchangeFormat         Long        1  1058
 Exif.Thumbnail.JPEGInterchangeFormatLength   Long        1  4492
 """,
         """File 1/1: $filename