Module: Amp::Core::Support::EncodingUtils

Defined in:
lib/amp-core/support/encoding_utils.rb

Overview

This module is a set of string functions that we use frequently. They sued to be monkey-patched onto the String class, but we don’t do that anymore.

Class Method Summary collapse

Class Method Details

.network_to_host_64(src) ⇒ Integer

Used for byte-swapping a 64-bit double long. Unfortuantely, this will invoke bignum logic, which is ridiculously slow. That’s why we have a C extension.

If the system is little endian, we work some magic. If the system is big endian, we just return self.

Returns:

  • (Integer) —

    the number swapped as if it were a 64-bit integer



33
34
35
36
37
38
39
40
41
42
 
# File 'lib/amp-core/support/encoding_utils.rb', line 33

def network_to_host_64(src)
  if Amp::Core::Support::Platform::SYSTEM[:endian] == :little
    ((src >> 56))                      | ((src & 0x00FF000000000000) >> 40) |
    ((src & 0x0000FF0000000000) >> 24) | ((src & 0x000000FF00000000) >> 8 ) |
    ((src & 0x00000000FF000000) << 8 ) | ((src & 0x0000000000FF0000) << 24) |
    ((src & 0x000000000000FF00) << 40) | ((src & 0x00000000000000FF) << 56)
  else
    src
  end
end