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Published:

27 January 2011, 13:00

Updated:

22 November 2016, 07:32

\MQL5\Include\

alexstal_hash.mqh (10.5 KB) view

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General purpose hash functions:

adler32
CRC-32 (fast, table implementation)
MaHash8v64 (fast, table implementation)

All three functions are adapted for MQL5 Unicode strings. The results has been verified with Fsum Frontend 1.5.5.1.

Radix Conversion:

from decimal (ulong) to Base radix
inverse transformation

The radix conversion is based on the following sequence of chars: 10 [0..9] + 26 [A..Z] + 26 [a..z] + 33 [А..Я] + 33 [а..я]. The "0-9" digits and "A-Z" english letters are used up to base 36.

The possible practical use of the other radix may be the compact form of string representation of a number in names of graphic objects. For example, 64-bit number generally has the following number of chars:

decimal: 20 chars (ULONG_MAX)
hexadecimal: 16 chars
base 36: 11 chars
base 128: 10 chars

the optimal is the base 36 radix.

Translated from Russian by MetaQuotes Ltd.
Original code: https://www.mql5.com/ru/code/277