Revert AVRO-1559. Drop support for Ruby 1.8.

git-svn-id: https://svn.apache.org/repos/asf/avro/trunk@1689710 13f79535-47bb-0310-9956-ffa450edef68

Author: tomwhite

BUILD.txt

@@ -11,7 +11,7 @@ The following packages must be installed before Avro can be built:
  - C++: cmake 2.8.4 or greater, g++, flex, bison, libboost-dev
  - C#: mono-devel mono-gmcs nunit
  - JavaScript: nodejs, npm
- - Ruby: ruby 2.0 or greater, ruby-dev, gem, rake, echoe, yajl-ruby
+ - Ruby: ruby 1.86 or greater, ruby-dev, gem, rake, echoe, yajl-ruby
  - Perl: perl 5.8.1 or greater, gmake, Module::Install,
    Module::Install::ReadmeFromPod, Module::Install::Repository,
    Math::BigInt, JSON::XS, Try::Tiny, Regexp::Common, Encode,

CHANGES.txt

@@ -18,8 +18,6 @@ Trunk (not yet released)
     artifacts. To use with Hadoop 1, set the classifier to hadoop1.
     (tomwhite)
 
-    AVRO-1559. Drop support for Ruby 1.8. (Willem van Bergen via tomwhite)
-
   NEW FEATURES
 
     AVRO-1555.  C#: Add support for RPC over HTTP. (Dmitry Kovalev via cutting)

lang/ruby/lib/avro/data_file.rb

@@ -19,8 +19,9 @@
 module Avro
   module DataFile
     VERSION = 1
-    MAGIC = ("Obj" + [VERSION].pack('c')).force_encoding('BINARY')
-    MAGIC_SIZE = MAGIC.bytesize
+    MAGIC = "Obj" + [VERSION].pack('c')
+    MAGIC.force_encoding('BINARY') if MAGIC.respond_to?(:force_encoding)
+    MAGIC_SIZE = MAGIC.respond_to?(:bytesize) ? MAGIC.bytesize : MAGIC.size
     SYNC_SIZE = 16
     SYNC_INTERVAL = 4000 * SYNC_SIZE
     META_SCHEMA = Schema.parse('{"type": "map", "values": "bytes"}')
@@ -182,7 +183,7 @@ def write_block
           # write number of items in block and block size in bytes
           encoder.write_long(block_count)
           to_write = codec.compress(buffer_writer.string)
-          encoder.write_long(to_write.bytesize)
+          encoder.write_long(to_write.respond_to?(:bytesize) ? to_write.bytesize : to_write.size)
 
           # write block contents
           writer.write(to_write)

lang/ruby/lib/avro/io.rb

@@ -97,7 +97,7 @@ def read_string
         # A string is encoded as a long followed by that many bytes of
         # UTF-8 encoded character data.
         read_bytes.tap do |string|
-          string.force_encoding("UTF-8")
+          string.force_encoding("UTF-8") if string.respond_to? :force_encoding
         end
       end