Name

get_crc_table — Generates tables for a byte-wise 32-bit CRC calculation based on the polynomial.

Library

Libz.lib

Synopsis

#include <zlib.h>
const uLongf * get_crc_table(void);

Return Value

The get_crc_table() function shall return a pointer to the first of a set of tables used internally to calculate CRC-32 values (see crc32()).

Detailed Description

Generate tables for a byte-wise 32-bit CRC calculation based on the polynomial: x³²+x²⁶+x²³+x²²+x¹⁶+x¹²+x¹¹+x¹⁰+x⁸+x⁷+x⁵+x⁴+x²+x+1

In a multi-threaded application, get_crc_table() should be called by one thread to initialize the tables before any other thread calls any libz function.

Examples

To generate tables for a byte-wise 32-bit CRC calculation based on the polynomial:

#include <stdio.h>
#include <zlib.h>

void Get_crc_table( )

{ 
    const unsigned long* pcrc_32_tab;    
    pcrc_32_tab = get_crc_table();       
}

Errors

None defined.

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