FIX: Decompressing lots of small files triggered error

An archive containing lots of small files could trigger an error even though the amount of decompressed data was way below the maximum allowed size. This happened because the decompression algorithm used the chunk size for calculating the remaining size instead of the actual size of the decompressed chunk.

lib/compression/strategy.rb

@@ -83,9 +83,8 @@ module Compression
       end
 
       ::File.open(entry_path, 'wb') do |os|
-        buf = ''.dup
         while (buf = entry.read(chunk_size))
-          remaining_size -= chunk_size
+          remaining_size -= buf.size
           raise ExtractFailed if remaining_size.negative?
           os << buf
         end