unpack_deltified

in lib/grit/git-ruby/internal/pack.rb [293:321]

• 24 lines of code
• 7 McCabe index (conditional complexity)

        def unpack_deltified(packfile, type, offset, obj_offset, size, options = {})
          packfile.seek(offset)
          data = packfile.read(SHA1Size)

          if type == OBJ_OFS_DELTA
            i = 0
            c = data.getord(i)
            base_offset = c & 0x7f
            while c & 0x80 != 0
              c = data.getord(i += 1)
              base_offset += 1
              base_offset <<= 7
              base_offset |= c & 0x7f
            end
            base_offset = obj_offset - base_offset
            offset += i + 1
          else
            base_offset = find_object(data)
            offset += SHA1Size
          end

          base, type = unpack_object(packfile, base_offset)

          return [false, false] if !(type == OBJ_COMMIT || type == OBJ_TREE) && options[:caching]

          delta = unpack_compressed(offset, size)
          [patch_delta(base, delta), type]
        end