PrettyDiff.rb fails to render image diffs with Ruby 1.9.3p194

https://bugs.webkit.org/show_bug.cgi?id=104932

Reviewed by Eric Seidel.

Ruby 1.9 added the concept of string encodings, so the use of `match' with binary data
treats it as UTF-8. Forcing the png_bytes string to have the "binary" encoding avoids
this error.

* PrettyPatch/PrettyPatch.rb: Use force_encoding.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@138585 268f45cc-cd09-0410-ab3c-d52691b4dbfc

diff --git a/Websites/bugs.webkit.org/ChangeLog b/Websites/bugs.webkit.org/ChangeLog
index f7db8e6..1e61196 100644 (file)
--- a/Websites/bugs.webkit.org/ChangeLog
+++ b/Websites/bugs.webkit.org/ChangeLog
@@ -1,3 +1,16 @@
+2012-12-30  Martin Robinson  <mrobinson@igalia.com>
+
+        PrettyDiff.rb fails to render image diffs with Ruby 1.9.3p194
+        https://bugs.webkit.org/show_bug.cgi?id=104932
+
+        Reviewed by Eric Seidel.
+
+        Ruby 1.9 added the concept of string encodings, so the use of `match' with binary data
+        treats it as UTF-8. Forcing the png_bytes string to have the "binary" encoding avoids
+        this error.
+
+        * PrettyPatch/PrettyPatch.rb: Use force_encoding.
+
 2012-12-06  Ojan Vafai  <ojan@chromium.org>
 
         Review page is super flakey now

diff --git a/Websites/bugs.webkit.org/PrettyPatch/PrettyPatch.rb b/Websites/bugs.webkit.org/PrettyPatch/PrettyPatch.rb
index 45e794d..4087296 100644 (file)
--- a/Websites/bugs.webkit.org/PrettyPatch/PrettyPatch.rb
+++ b/Websites/bugs.webkit.org/PrettyPatch/PrettyPatch.rb
@@ -676,6 +676,11 @@ EOF
         end
 
         def self.read_checksum_from_png(png_bytes)
+            # Ruby 1.9 added the concept of string encodings, so to avoid treating binary data as UTF-8,
+            # we can force the encoding to binary at this point.
+            if RUBY_VERSION >= "1.9"
+                png_bytes.force_encoding('binary')
+            end
             match = png_bytes && png_bytes.match(/tEXtchecksum\0([a-fA-F0-9]{32})/)
             match ? match[1] : nil
         end