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Whoaa_aaa_14293's avatar
Whoaa_aaa_14293
Icon for Nimbostratus rankNimbostratus
Feb 26, 2014
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High and low bits of 64-bit long and C#

Hi, what is the best way to take the high and low bits provided through iControl and create a 'long' in C from them?

 

I am currently using:

 

long wut = (ssl.statistics[0].value.high << 32) | ssl.statistics[0].value.low;

 

However, I am not sure this is how the values are intended to be used. Sometimes I am not getting the values I expect, but my expectations may be incorrect.

 

devops
iControl
  • mhite_60883's avatar
    mhite_60883
    Feb 26, 2014

    I can't help you with C, but maybe you'll be able to convert this. Here's how I do it in Python:

    def convert_to_64_bit(high, low):
    """ Converts two 32 bit signed integers to a 64-bit unsigned integer.
    """
    if high < 0:
        high = high + (1 << 32)
    if low < 0:
        low = low + (1 << 32)
    value = long((high << 32) | low)
    assert(value >= 0)
    return value

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  • Whoaa_aaa_14293's avatar
    Whoaa_aaa_14293
    Icon for Nimbostratus rankNimbostratus
    Feb 26, 2014
    For instance, using the values for STATISTIC_MEMORY_TOTAL_BYTES: ulong bl = (ulong)(val.high << 32) | (ulong)val.low; results in: High: 7 Low: -546316288 Result: 18446744073163235328 This is a crazy number and is in no way accurate. If I treat them as longs and not ulongs, the result is negative, which (again) is not accurate. Thoughts?
  • mhite_60883's avatar
    mhite_60883
    Icon for Cirrocumulus rankCirrocumulus
    Feb 26, 2014

    I can't help you with C, but maybe you'll be able to convert this. Here's how I do it in Python:

    def convert_to_64_bit(high, low):
    """ Converts two 32 bit signed integers to a 64-bit unsigned integer.
    """
    if high < 0:
        high = high + (1 << 32)
    if low < 0:
        low = low + (1 << 32)
    value = long((high << 32) | low)
    assert(value >= 0)
    return value
    • Whoaa_aaa_14293's avatar
      Whoaa_aaa_14293
      Icon for Nimbostratus rankNimbostratus
      Feb 26, 2014
      I must be misunderstanding what the high and low values are then. Even when porting your code to C (which was basically just adding the if checks), I get the same exact behaviour. And I can't find any documentation detailing getting the real value out of these two high and low values.
    • mhite_60883's avatar
      mhite_60883
      Icon for Cirrocumulus rankCirrocumulus
      Feb 26, 2014
      Here is Joe's explanation: https://devcentral.f5.com/s/feed/0D51T00006i7P6lSAE https://devcentral.f5.com/s/articles/icontrol-apps-05-rate-based-statistics