Fixing encoding of decimals ending in .0 or 0.0

lib/cql/protocol/cql_byte_buffer.rb

@@ -264,9 +264,12 @@ def append_varint(n)
       end
 
       def append_decimal(n)
-        sign, number_string, _, size = n.split
+        str = n.to_s(FLOAT_STRING_FORMAT)
+        size = str.index(DECIMAL_POINT)
+        number_string = str.gsub(DECIMAL_POINT, NO_CHAR)
+
         num = number_string.to_i
-        raw = self.class.new.append_varint(sign * num)
+        raw = self.class.new.append_varint(num)
         append_int(number_string.length - size)
         append(raw)
       end
@@ -284,6 +287,8 @@ def append_float(n)
       MINUS = '-'.freeze
       ZERO = '0'.freeze
       DECIMAL_POINT = '.'.freeze
+      FLOAT_STRING_FORMAT = 'F'.freeze
+      NO_CHAR = ''.freeze
     end
   end
 end

spec/cql/protocol/cql_byte_buffer_spec.rb

@@ -853,6 +853,16 @@ module Protocol
           buffer.should eql_bytes("\x00\x00\x00\x01\x00")
         end
 
+        it 'encodes a BigDecimal ending in .0' do
+          buffer.append_decimal(BigDecimal.new('1042342234234.0'))
+          buffer.should eql_bytes("\x00\x00\x00\x01\tz\xE4b\xD4\xC4")
+        end
+
+        it 'encodes a BigDecimal ending with 00.0' do
+          buffer.append_decimal(BigDecimal.new('12000.0'))
+          buffer.should eql_bytes("\x00\x00\x00\x01\x01\xD4\xC0")
+        end
+
         it 'appends to the buffer' do
           buffer << "\x99"
           buffer.append_decimal(BigDecimal.new('1042342234234.123423435647768234'))