crackNum

Crack various integer, floating-point data formats

Version on this page:[email protected]:1
LTS Haskell 15.13:2.3
Stackage Nightly 2020-05-26:2.3
Latest on Hackage:2.3

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BSD-3-Clause licensed by Levent Erkok
Maintained by [email protected]

Module documentation for 1.5

This version can be pinned in stack with:[email protected]:a8b9973ada5a3b5afbebd90991cf8913dc3f4c0f795ce8ebe61a0d4ff2802e13,1382

CrackNum: Decode/Encode IEE754 Numbers

Hackage version Build Status

Command line options:

crackNum v1.5, (c) Levent Erkok. Released with a BSD3 license.
Usage: crackNum precision bit/hex-pattern
          --hp        16 bit half     precision
          --sp        32 bit single   precision
          --dp        64 bit double   precision
          --sb         8 bit signed   byte
          --sw        16 bit signed   word
          --sd        32 bit signed   double
          --sq        64 bit signed   quad
          --ub         8 bit unsigned byte
          --uw        16 bit unsigned word
          --ud        32 bit unsigned double
          --uq        64 bit unsigned quad
          --toIEEE=n  Convert from decimal to IEEE SP/DP formats.
  -l n    --lanes=n   number of lanes
  -h, -?  --help      print help, with examples
  -v      --version   print version info

Examples:

   crackNum --hp fc00
   crackNum --sp fc00 abcd
   crackNum --dp fc00 abc1 2345 6789
   crackNum --sp 01111111110000000000000000000000
   crackNum -l2 --hp 01111111110000000000000000000000
   crackNum --sb 7f
   crackNum --sp --toIEEE=-2.3e6
   crackNum --dp --toIEEE=max
   crackNum --dp --toIEEE=ulp

Notes:
  - You can use hexadecimal or binary as input.
  - You can use _,- or space as a digit to improve readability.
  - You can give input for multiple lanes, we will guess the #of lanes for you.
    Or, you can specify number of lanes with the -l option.
  - For "toIEEE" option (case doesn't matter):
        - You can enter a number in decimal notation (like 2.3)
        - OR, enter one of the following:
               * infinity, -infinity: Positive/Negative infinities
               * nan, snan, qnan: Not-A-Number; signaling/quiet
               * 0, -0: Both kinds of zeros
               * max : The maximum finite positive value
               * -max: The minimum finite negative value
               * min : The minimum normal positive value
               * -min: The maximum normal negative value
               * epsilon: The smallest possible value x s.t. 1+x /= 1.
               * ulp: The minimum subnormal value

Example: Decoding single-precision numbers on two lanes

$ crackNum --sp fc00 abc1 7F80 0001
== Lane: 1 ==========================================
                  3  2          1         0
                  1 09876543 21098765432109876543210
                  S ---E8--- ----------F23----------
          Binary: 1 11111000 00000001010101111000001
             Hex: FC00 ABC1
       Precision: SP
            Sign: Negative
        Exponent: 121 (Stored: 248, Bias: 127)
           Value: -2.6723903e36 (NORMAL)
== Lane: 0 ==========================================
                  3  2          1         0
                  1 09876543 21098765432109876543210
                  S ---E8--- ----------F23----------
          Binary: 0 11111111 00000000000000000000001
             Hex: 7F80 0001
       Precision: SP
            Sign: Positive
        Exponent: 128 (Stored: 255, Bias: 127)
           Value: NaN (Signaling)
            Note: Representation for NaN's is not unique.

Example: Encoding a float as a IEEE754 single-precision bit-pattern

$ crackNum --sp --toIEEE=-2.3e6
            3  2          1         0
            1 09876543 21098765432109876543210
            S ---E8--- ----------F23----------
    Binary: 1 10010100 00011000110000110000000
       Hex: CA0C 6180
 Precision: SP
      Sign: Negative
  Exponent: 21 (Stored: 148, Bias: 127)
     Value: -2300000.0 (NORMAL)

Changes

Version 1.5, 2016-01-23

  • Typo fixes; no functionality changes

Version 1.4, 2016-01-17

  • Fix NaN nomenclature: Screaming->Signaling
  • Add an example to README.md

Version 1.3, 2015-04-11

  • Fix docs, github location

Version 1.2, 2015-04-11

  • Fix the constant qnan values for SP/DP
  • Add conversions from float/double. Much easier to use.
  • Better handling of nan values.

Version 1.1, 2015-04-02

  • Clean-up the API, examples etc.

Version 1.0, 2015-04-01

  • First implementation. Supports HP/SP/DP and signed/unsigned numbers in 8/16/32/64 bits.
Used by 1 package in lts-6.35(full list with versions):