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<html><!-- Created using the cpp_pretty_printer from the dlib C++ library.  See http://dlib.net for updates. --><head><title>dlib C++ Library - crc32.c</title></head><body bgcolor='white'><pre>
<font color='#009900'>/* crc32.c -- compute the CRC-32 of a data stream
 * Copyright (C) 1995-2006, 2010, 2011, 2012 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 *
 * Thanks to Rodney Brown &lt;[email protected]&gt; for his contribution of faster
 * CRC methods: exclusive-oring 32 bits of data at a time, and pre-computing
 * tables for updating the shift register in one step with three exclusive-ors
 * instead of four steps with four exclusive-ors.  This results in about a
 * factor of two increase in speed on a Power PC G4 (PPC7455) using gcc -O3.
 */</font>

<font color='#009900'>/* @(#) $Id$ */</font>

<font color='#009900'>/*
  Note on the use of DYNAMIC_CRC_TABLE: there is no mutex or semaphore
  protection on the static variables used to control the first-use generation
  of the crc tables.  Therefore, if you #define DYNAMIC_CRC_TABLE, you should
  first call get_crc_table() to initialize the tables before allowing more than
  one thread to use crc32().

  DYNAMIC_CRC_TABLE and MAKECRCH can be #defined to write out crc32.h.
 */</font>

<font color='#0000FF'>#ifdef</font> MAKECRCH
#  include <font color='#5555FF'>&lt;</font>stdio.h<font color='#5555FF'>&gt;</font>
#  ifndef DYNAMIC_CRC_TABLE
#    define DYNAMIC_CRC_TABLE
#  endif <font color='#009900'>/* !DYNAMIC_CRC_TABLE */</font>
<font color='#0000FF'>#endif</font> <font color='#009900'>/* MAKECRCH */</font>

<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='zutil.h.html'>zutil.h</a>"      <font color='#009900'>/* for STDC and FAR definitions */</font>

<font color='#0000FF'>#define</font> local <font color='#0000FF'>static</font>

<font color='#009900'>/* Definitions for doing the crc four data bytes at a time. */</font>
<font color='#0000FF'>#if</font> <font color='#5555FF'>!</font>defined<font face='Lucida Console'>(</font>NOBYFOUR<font face='Lucida Console'>)</font> <font color='#5555FF'>&amp;</font><font color='#5555FF'>&amp;</font> defined<font face='Lucida Console'>(</font>Z_U4<font face='Lucida Console'>)</font>
#  define BYFOUR
<font color='#0000FF'>#endif</font>
<font color='#0000FF'>#ifdef</font> BYFOUR
   local <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> crc32_little <b><a name='OF'></a>OF</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font>,
                        <font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font> FAR <font color='#5555FF'>*</font>, <font color='#0000FF'><u>unsigned</u></font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
   local <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> crc32_big <b><a name='OF'></a>OF</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font>,
                        <font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font> FAR <font color='#5555FF'>*</font>, <font color='#0000FF'><u>unsigned</u></font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
#  define TBLS <font color='#979000'>8</font>
<font color='#0000FF'>#else</font>
#  define TBLS <font color='#979000'>1</font>
<font color='#0000FF'>#endif</font> <font color='#009900'>/* BYFOUR */</font>

<font color='#009900'>/* Local functions for crc concatenation */</font>
local <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> gf2_matrix_times <b><a name='OF'></a>OF</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> <font color='#5555FF'>*</font>mat,
                                         <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> vec<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
local <font color='#0000FF'><u>void</u></font> gf2_matrix_square <b><a name='OF'></a>OF</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> <font color='#5555FF'>*</font>square, <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> <font color='#5555FF'>*</font>mat<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
local uLong crc32_combine_ <b><a name='OF'></a>OF</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>uLong crc1, uLong crc2, z_off64_t len2<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;


<font color='#0000FF'>#ifdef</font> DYNAMIC_CRC_TABLE

local <font color='#0000FF'>volatile</font> <font color='#0000FF'><u>int</u></font> crc_table_empty <font color='#5555FF'>=</font> <font color='#979000'>1</font>;
local z_crc_t FAR crc_table[TBLS][<font color='#979000'>256</font>];
local <font color='#0000FF'><u>void</u></font> make_crc_table <b><a name='OF'></a>OF</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<font color='#0000FF'>#ifdef</font> MAKECRCH
   local <font color='#0000FF'><u>void</u></font> write_table <b><a name='OF'></a>OF</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>FILE <font color='#5555FF'>*</font>, <font color='#0000FF'>const</font> z_crc_t FAR <font color='#5555FF'>*</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<font color='#0000FF'>#endif</font> <font color='#009900'>/* MAKECRCH */</font>
<font color='#009900'>/*
  Generate tables for a byte-wise 32-bit CRC calculation on the polynomial:
  x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1.

  Polynomials over GF(2) are represented in binary, one bit per coefficient,
  with the lowest powers in the most significant bit.  Then adding polynomials
  is just exclusive-or, and multiplying a polynomial by x is a right shift by
  one.  If we call the above polynomial p, and represent a byte as the
  polynomial q, also with the lowest power in the most significant bit (so the
  byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,
  where a mod b means the remainder after dividing a by b.

  This calculation is done using the shift-register method of multiplying and
  taking the remainder.  The register is initialized to zero, and for each
  incoming bit, x^32 is added mod p to the register if the bit is a one (where
  x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by
  x (which is shifting right by one and adding x^32 mod p if the bit shifted
  out is a one).  We start with the highest power (least significant bit) of
  q and repeat for all eight bits of q.

  The first table is simply the CRC of all possible eight bit values.  This is
  all the information needed to generate CRCs on data a byte at a time for all
  combinations of CRC register values and incoming bytes.  The remaining tables
  allow for word-at-a-time CRC calculation for both big-endian and little-
  endian machines, where a word is four bytes.
*/</font>
local <font color='#0000FF'><u>void</u></font> <b><a name='make_crc_table'></a>make_crc_table</b><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>
<b>{</b>
    z_crc_t c;
    <font color='#0000FF'><u>int</u></font> n, k;
    z_crc_t poly;                       <font color='#009900'>/* polynomial exclusive-or pattern */</font>
    <font color='#009900'>/* terms of polynomial defining this crc (except x^32): */</font>
    <font color='#0000FF'>static</font> <font color='#0000FF'>volatile</font> <font color='#0000FF'><u>int</u></font> first <font color='#5555FF'>=</font> <font color='#979000'>1</font>;      <font color='#009900'>/* flag to limit concurrent making */</font>
    <font color='#0000FF'>static</font> <font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font> p[] <font color='#5555FF'>=</font> <b>{</b><font color='#979000'>0</font>,<font color='#979000'>1</font>,<font color='#979000'>2</font>,<font color='#979000'>4</font>,<font color='#979000'>5</font>,<font color='#979000'>7</font>,<font color='#979000'>8</font>,<font color='#979000'>10</font>,<font color='#979000'>11</font>,<font color='#979000'>12</font>,<font color='#979000'>16</font>,<font color='#979000'>22</font>,<font color='#979000'>23</font>,<font color='#979000'>26</font><b>}</b>;

    <font color='#009900'>/* See if another task is already doing this (not thread-safe, but better
       than nothing -- significantly reduces duration of vulnerability in
       case the advice about DYNAMIC_CRC_TABLE is ignored) */</font>
    <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>first<font face='Lucida Console'>)</font> <b>{</b>
        first <font color='#5555FF'>=</font> <font color='#979000'>0</font>;

        <font color='#009900'>/* make exclusive-or pattern from polynomial (0xedb88320UL) */</font>
        poly <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
        <font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>n <font color='#5555FF'>=</font> <font color='#979000'>0</font>; n <font color='#5555FF'>&lt;</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>int</u></font><font face='Lucida Console'>)</font><font face='Lucida Console'>(</font><font color='#0000FF'>sizeof</font><font face='Lucida Console'>(</font>p<font face='Lucida Console'>)</font><font color='#5555FF'>/</font><font color='#0000FF'>sizeof</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>; n<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font>
            poly <font color='#5555FF'>|</font><font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>z_crc_t<font face='Lucida Console'>)</font><font color='#979000'>1</font> <font color='#5555FF'>&lt;</font><font color='#5555FF'>&lt;</font> <font face='Lucida Console'>(</font><font color='#979000'>31</font> <font color='#5555FF'>-</font> p[n]<font face='Lucida Console'>)</font>;

        <font color='#009900'>/* generate a crc for every 8-bit value */</font>
        <font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>n <font color='#5555FF'>=</font> <font color='#979000'>0</font>; n <font color='#5555FF'>&lt;</font> <font color='#979000'>256</font>; n<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
            c <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>z_crc_t<font face='Lucida Console'>)</font>n;
            <font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>k <font color='#5555FF'>=</font> <font color='#979000'>0</font>; k <font color='#5555FF'>&lt;</font> <font color='#979000'>8</font>; k<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font>
                c <font color='#5555FF'>=</font> c <font color='#5555FF'>&amp;</font> <font color='#979000'>1</font> ? poly ^ <font face='Lucida Console'>(</font>c <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>1</font><font face='Lucida Console'>)</font> : c <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>1</font>;
            crc_table[<font color='#979000'>0</font>][n] <font color='#5555FF'>=</font> c;
        <b>}</b>

<font color='#0000FF'>#ifdef</font> BYFOUR
        <font color='#009900'>/* generate crc for each value followed by one, two, and three zeros,
           and then the byte reversal of those as well as the first table */</font>
        <font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>n <font color='#5555FF'>=</font> <font color='#979000'>0</font>; n <font color='#5555FF'>&lt;</font> <font color='#979000'>256</font>; n<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
            c <font color='#5555FF'>=</font> crc_table[<font color='#979000'>0</font>][n];
            crc_table[<font color='#979000'>4</font>][n] <font color='#5555FF'>=</font> <font color='#BB00BB'>ZSWAP32</font><font face='Lucida Console'>(</font>c<font face='Lucida Console'>)</font>;
            <font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>k <font color='#5555FF'>=</font> <font color='#979000'>1</font>; k <font color='#5555FF'>&lt;</font> <font color='#979000'>4</font>; k<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
                c <font color='#5555FF'>=</font> crc_table[<font color='#979000'>0</font>][c <font color='#5555FF'>&amp;</font> <font color='#979000'>0xff</font>] ^ <font face='Lucida Console'>(</font>c <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font>;
                crc_table[k][n] <font color='#5555FF'>=</font> c;
                crc_table[k <font color='#5555FF'>+</font> <font color='#979000'>4</font>][n] <font color='#5555FF'>=</font> <font color='#BB00BB'>ZSWAP32</font><font face='Lucida Console'>(</font>c<font face='Lucida Console'>)</font>;
            <b>}</b>
        <b>}</b>
<font color='#0000FF'>#endif</font> <font color='#009900'>/* BYFOUR */</font>

        crc_table_empty <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
    <b>}</b>
    <font color='#0000FF'>else</font> <b>{</b>      <font color='#009900'>/* not first */</font>
        <font color='#009900'>/* wait for the other guy to finish (not efficient, but rare) */</font>
        <font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>crc_table_empty<font face='Lucida Console'>)</font>
            ;
    <b>}</b>

<font color='#0000FF'>#ifdef</font> MAKECRCH
    <font color='#009900'>/* write out CRC tables to crc32.h */</font>
    <b>{</b>
        FILE <font color='#5555FF'>*</font>out;

        out <font color='#5555FF'>=</font> <font color='#BB00BB'>fopen</font><font face='Lucida Console'>(</font>"<font color='#CC0000'>crc32.h</font>", "<font color='#CC0000'>w</font>"<font face='Lucida Console'>)</font>;
        <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>out <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <font color='#0000FF'>return</font>;
        <font color='#BB00BB'>fprintf</font><font face='Lucida Console'>(</font>out, "<font color='#CC0000'>/* crc32.h -- tables for rapid CRC calculation\n</font>"<font face='Lucida Console'>)</font>;
        <font color='#BB00BB'>fprintf</font><font face='Lucida Console'>(</font>out, "<font color='#CC0000'> * Generated automatically by crc32.c\n */\n\n</font>"<font face='Lucida Console'>)</font>;
        <font color='#BB00BB'>fprintf</font><font face='Lucida Console'>(</font>out, "<font color='#CC0000'>local const z_crc_t FAR </font>"<font face='Lucida Console'>)</font>;
        <font color='#BB00BB'>fprintf</font><font face='Lucida Console'>(</font>out, "<font color='#CC0000'>crc_table[TBLS][256] =\n{\n  {\n</font>"<font face='Lucida Console'>)</font>;
        <font color='#BB00BB'>write_table</font><font face='Lucida Console'>(</font>out, crc_table[<font color='#979000'>0</font>]<font face='Lucida Console'>)</font>;
#  ifdef BYFOUR
        <font color='#BB00BB'>fprintf</font><font face='Lucida Console'>(</font>out, "<font color='#CC0000'>#ifdef BYFOUR\n</font>"<font face='Lucida Console'>)</font>;
        <font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>k <font color='#5555FF'>=</font> <font color='#979000'>1</font>; k <font color='#5555FF'>&lt;</font> <font color='#979000'>8</font>; k<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
            <font color='#BB00BB'>fprintf</font><font face='Lucida Console'>(</font>out, "<font color='#CC0000'>  },\n  {\n</font>"<font face='Lucida Console'>)</font>;
            <font color='#BB00BB'>write_table</font><font face='Lucida Console'>(</font>out, crc_table[k]<font face='Lucida Console'>)</font>;
        <b>}</b>
        <font color='#BB00BB'>fprintf</font><font face='Lucida Console'>(</font>out, "<font color='#CC0000'>#endif\n</font>"<font face='Lucida Console'>)</font>;
#  endif <font color='#009900'>/* BYFOUR */</font>
        <font color='#BB00BB'>fprintf</font><font face='Lucida Console'>(</font>out, "<font color='#CC0000'>  }\n};\n</font>"<font face='Lucida Console'>)</font>;
        <font color='#BB00BB'>fclose</font><font face='Lucida Console'>(</font>out<font face='Lucida Console'>)</font>;
    <b>}</b>
<font color='#0000FF'>#endif</font> <font color='#009900'>/* MAKECRCH */</font>
<b>}</b>

<font color='#0000FF'>#ifdef</font> MAKECRCH
local <font color='#0000FF'><u>void</u></font> <b><a name='write_table'></a>write_table</b><font face='Lucida Console'>(</font>out, table<font face='Lucida Console'>)</font>
    FILE <font color='#5555FF'>*</font>out;
    <font color='#0000FF'>const</font> z_crc_t FAR <font color='#5555FF'>*</font>table;
<b>{</b>
    <font color='#0000FF'><u>int</u></font> n;

    <font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>n <font color='#5555FF'>=</font> <font color='#979000'>0</font>; n <font color='#5555FF'>&lt;</font> <font color='#979000'>256</font>; n<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font>
        <font color='#BB00BB'>fprintf</font><font face='Lucida Console'>(</font>out, "<font color='#CC0000'>%s0x%08lxUL%s</font>", n <font color='#5555FF'>%</font> <font color='#979000'>5</font> ? "<font color='#CC0000'></font>" : "<font color='#CC0000'>    </font>",
                <font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font><font face='Lucida Console'>)</font><font face='Lucida Console'>(</font>table[n]<font face='Lucida Console'>)</font>,
                n <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>255</font> ? "<font color='#CC0000'>\n</font>" : <font face='Lucida Console'>(</font>n <font color='#5555FF'>%</font> <font color='#979000'>5</font> <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>4</font> ? "<font color='#CC0000'>,\n</font>" : "<font color='#CC0000'>, </font>"<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b>}</b>
<font color='#0000FF'>#endif</font> <font color='#009900'>/* MAKECRCH */</font>

<font color='#0000FF'>#else</font> <font color='#009900'>/* !DYNAMIC_CRC_TABLE */</font>
<font color='#009900'>/* ========================================================================
 * Tables of CRC-32s of all single-byte values, made by make_crc_table().
 */</font>
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='crc32.h.html'>crc32.h</a>"
<font color='#0000FF'>#endif</font> <font color='#009900'>/* DYNAMIC_CRC_TABLE */</font>

<font color='#009900'>/* =========================================================================
 * This function can be used by asm versions of crc32()
 */</font>
<font color='#0000FF'>const</font> z_crc_t FAR <font color='#5555FF'>*</font> ZEXPORT <b><a name='get_crc_table'></a>get_crc_table</b><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>
<b>{</b>
<font color='#0000FF'>#ifdef</font> DYNAMIC_CRC_TABLE
    <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>crc_table_empty<font face='Lucida Console'>)</font>
        <font color='#BB00BB'>make_crc_table</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>;
<font color='#0000FF'>#endif</font> <font color='#009900'>/* DYNAMIC_CRC_TABLE */</font>
    <font color='#0000FF'>return</font> <font face='Lucida Console'>(</font><font color='#0000FF'>const</font> z_crc_t FAR <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>crc_table;
<b>}</b>

<font color='#009900'>/* ========================================================================= */</font>
<font color='#0000FF'>#define</font> DO1 crc <font color='#5555FF'>=</font> crc_table[<font color='#979000'>0</font>][<font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>int</u></font><font face='Lucida Console'>)</font>crc ^ <font face='Lucida Console'>(</font><font color='#5555FF'>*</font>buf<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&amp;</font> <font color='#979000'>0xff</font>] ^ <font face='Lucida Console'>(</font>crc <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font>
<font color='#0000FF'>#define</font> DO8 DO1; DO1; DO1; DO1; DO1; DO1; DO1; DO1

<font color='#009900'>/* ========================================================================= */</font>
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> ZEXPORT <b><a name='crc32'></a>crc32</b><font face='Lucida Console'>(</font>crc, buf, len<font face='Lucida Console'>)</font>
    <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> crc;
    <font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font> FAR <font color='#5555FF'>*</font>buf;
    uInt len;
<b>{</b>
    <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>buf <font color='#5555FF'>=</font><font color='#5555FF'>=</font> Z_NULL<font face='Lucida Console'>)</font> <font color='#0000FF'>return</font> <font color='#979000'>0</font>UL;

<font color='#0000FF'>#ifdef</font> DYNAMIC_CRC_TABLE
    <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>crc_table_empty<font face='Lucida Console'>)</font>
        <font color='#BB00BB'>make_crc_table</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>;
<font color='#0000FF'>#endif</font> <font color='#009900'>/* DYNAMIC_CRC_TABLE */</font>

<font color='#0000FF'>#ifdef</font> BYFOUR
    <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#0000FF'>sizeof</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font> <font color='#5555FF'>*</font><font face='Lucida Console'>)</font> <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#0000FF'>sizeof</font><font face='Lucida Console'>(</font>ptrdiff_t<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font> <b>{</b>
        z_crc_t endian;

        endian <font color='#5555FF'>=</font> <font color='#979000'>1</font>;
        <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#5555FF'>*</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font> <font color='#5555FF'>*</font><font face='Lucida Console'>)</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>endian<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
            <font color='#0000FF'>return</font> <font color='#BB00BB'>crc32_little</font><font face='Lucida Console'>(</font>crc, buf, len<font face='Lucida Console'>)</font>;
        <font color='#0000FF'>else</font>
            <font color='#0000FF'>return</font> <font color='#BB00BB'>crc32_big</font><font face='Lucida Console'>(</font>crc, buf, len<font face='Lucida Console'>)</font>;
    <b>}</b>
<font color='#0000FF'>#endif</font> <font color='#009900'>/* BYFOUR */</font>
    crc <font color='#5555FF'>=</font> crc ^ <font color='#979000'>0xffffffffUL</font>;
    <font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>len <font color='#5555FF'>&gt;</font><font color='#5555FF'>=</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <b>{</b>
        DO8;
        len <font color='#5555FF'>-</font><font color='#5555FF'>=</font> <font color='#979000'>8</font>;
    <b>}</b>
    <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>len<font face='Lucida Console'>)</font> <font color='#0000FF'>do</font> <b>{</b>
        DO1;
    <b>}</b> <font color='#0000FF'>while</font> <font face='Lucida Console'>(</font><font color='#5555FF'>-</font><font color='#5555FF'>-</font>len<font face='Lucida Console'>)</font>;
    <font color='#0000FF'>return</font> crc ^ <font color='#979000'>0xffffffffUL</font>;
<b>}</b>

<font color='#0000FF'>#ifdef</font> BYFOUR

<font color='#009900'>/* ========================================================================= */</font>
<font color='#0000FF'>#define</font> DOLIT4 c ^<font color='#5555FF'>=</font> <font color='#5555FF'>*</font>buf4<font color='#5555FF'>+</font><font color='#5555FF'>+</font>; \
        c <font color='#5555FF'>=</font> crc_table[<font color='#979000'>3</font>][c <font color='#5555FF'>&amp;</font> <font color='#979000'>0xff</font>] ^ crc_table[<font color='#979000'>2</font>][<font face='Lucida Console'>(</font>c <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&amp;</font> <font color='#979000'>0xff</font>] ^ \
            crc_table[<font color='#979000'>1</font>][<font face='Lucida Console'>(</font>c <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>16</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&amp;</font> <font color='#979000'>0xff</font>] ^ crc_table[<font color='#979000'>0</font>][c <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>24</font>]
<font color='#0000FF'>#define</font> DOLIT32 DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4

<font color='#009900'>/* ========================================================================= */</font>
local <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> <b><a name='crc32_little'></a>crc32_little</b><font face='Lucida Console'>(</font>crc, buf, len<font face='Lucida Console'>)</font>
    <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> crc;
    <font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font> FAR <font color='#5555FF'>*</font>buf;
    <font color='#0000FF'><u>unsigned</u></font> len;
<b>{</b>
    <font color='#0000FF'>register</font> z_crc_t c;
    <font color='#0000FF'>register</font> <font color='#0000FF'>const</font> z_crc_t FAR <font color='#5555FF'>*</font>buf4;

    c <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>z_crc_t<font face='Lucida Console'>)</font>crc;
    c <font color='#5555FF'>=</font> ~c;
    <font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>len <font color='#5555FF'>&amp;</font><font color='#5555FF'>&amp;</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>ptrdiff_t<font face='Lucida Console'>)</font>buf <font color='#5555FF'>&amp;</font> <font color='#979000'>3</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font> <b>{</b>
        c <font color='#5555FF'>=</font> crc_table[<font color='#979000'>0</font>][<font face='Lucida Console'>(</font>c ^ <font color='#5555FF'>*</font>buf<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&amp;</font> <font color='#979000'>0xff</font>] ^ <font face='Lucida Console'>(</font>c <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font>;
        len<font color='#5555FF'>-</font><font color='#5555FF'>-</font>;
    <b>}</b>

    buf4 <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'>const</font> z_crc_t FAR <font color='#5555FF'>*</font><font face='Lucida Console'>)</font><font face='Lucida Console'>(</font><font color='#0000FF'>const</font> <font color='#0000FF'><u>void</u></font> FAR <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>buf;
    <font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>len <font color='#5555FF'>&gt;</font><font color='#5555FF'>=</font> <font color='#979000'>32</font><font face='Lucida Console'>)</font> <b>{</b>
        DOLIT32;
        len <font color='#5555FF'>-</font><font color='#5555FF'>=</font> <font color='#979000'>32</font>;
    <b>}</b>
    <font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>len <font color='#5555FF'>&gt;</font><font color='#5555FF'>=</font> <font color='#979000'>4</font><font face='Lucida Console'>)</font> <b>{</b>
        DOLIT4;
        len <font color='#5555FF'>-</font><font color='#5555FF'>=</font> <font color='#979000'>4</font>;
    <b>}</b>
    buf <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font> FAR <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>buf4;

    <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>len<font face='Lucida Console'>)</font> <font color='#0000FF'>do</font> <b>{</b>
        c <font color='#5555FF'>=</font> crc_table[<font color='#979000'>0</font>][<font face='Lucida Console'>(</font>c ^ <font color='#5555FF'>*</font>buf<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&amp;</font> <font color='#979000'>0xff</font>] ^ <font face='Lucida Console'>(</font>c <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font>;
    <b>}</b> <font color='#0000FF'>while</font> <font face='Lucida Console'>(</font><font color='#5555FF'>-</font><font color='#5555FF'>-</font>len<font face='Lucida Console'>)</font>;
    c <font color='#5555FF'>=</font> ~c;
    <font color='#0000FF'>return</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font><font face='Lucida Console'>)</font>c;
<b>}</b>

<font color='#009900'>/* ========================================================================= */</font>
<font color='#0000FF'>#define</font> DOBIG4 c ^<font color='#5555FF'>=</font> <font color='#5555FF'>*</font><font color='#5555FF'>+</font><font color='#5555FF'>+</font>buf4; \
        c <font color='#5555FF'>=</font> crc_table[<font color='#979000'>4</font>][c <font color='#5555FF'>&amp;</font> <font color='#979000'>0xff</font>] ^ crc_table[<font color='#979000'>5</font>][<font face='Lucida Console'>(</font>c <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&amp;</font> <font color='#979000'>0xff</font>] ^ \
            crc_table[<font color='#979000'>6</font>][<font face='Lucida Console'>(</font>c <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>16</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&amp;</font> <font color='#979000'>0xff</font>] ^ crc_table[<font color='#979000'>7</font>][c <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>24</font>]
<font color='#0000FF'>#define</font> DOBIG32 DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4

<font color='#009900'>/* ========================================================================= */</font>
local <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> <b><a name='crc32_big'></a>crc32_big</b><font face='Lucida Console'>(</font>crc, buf, len<font face='Lucida Console'>)</font>
    <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> crc;
    <font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font> FAR <font color='#5555FF'>*</font>buf;
    <font color='#0000FF'><u>unsigned</u></font> len;
<b>{</b>
    <font color='#0000FF'>register</font> z_crc_t c;
    <font color='#0000FF'>register</font> <font color='#0000FF'>const</font> z_crc_t FAR <font color='#5555FF'>*</font>buf4;

    c <font color='#5555FF'>=</font> <font color='#BB00BB'>ZSWAP32</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>z_crc_t<font face='Lucida Console'>)</font>crc<font face='Lucida Console'>)</font>;
    c <font color='#5555FF'>=</font> ~c;
    <font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>len <font color='#5555FF'>&amp;</font><font color='#5555FF'>&amp;</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>ptrdiff_t<font face='Lucida Console'>)</font>buf <font color='#5555FF'>&amp;</font> <font color='#979000'>3</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font> <b>{</b>
        c <font color='#5555FF'>=</font> crc_table[<font color='#979000'>4</font>][<font face='Lucida Console'>(</font>c <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>24</font><font face='Lucida Console'>)</font> ^ <font color='#5555FF'>*</font>buf<font color='#5555FF'>+</font><font color='#5555FF'>+</font>] ^ <font face='Lucida Console'>(</font>c <font color='#5555FF'>&lt;</font><font color='#5555FF'>&lt;</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font>;
        len<font color='#5555FF'>-</font><font color='#5555FF'>-</font>;
    <b>}</b>

    buf4 <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'>const</font> z_crc_t FAR <font color='#5555FF'>*</font><font face='Lucida Console'>)</font><font face='Lucida Console'>(</font><font color='#0000FF'>const</font> <font color='#0000FF'><u>void</u></font> FAR <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>buf;
    buf4<font color='#5555FF'>-</font><font color='#5555FF'>-</font>;
    <font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>len <font color='#5555FF'>&gt;</font><font color='#5555FF'>=</font> <font color='#979000'>32</font><font face='Lucida Console'>)</font> <b>{</b>
        DOBIG32;
        len <font color='#5555FF'>-</font><font color='#5555FF'>=</font> <font color='#979000'>32</font>;
    <b>}</b>
    <font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>len <font color='#5555FF'>&gt;</font><font color='#5555FF'>=</font> <font color='#979000'>4</font><font face='Lucida Console'>)</font> <b>{</b>
        DOBIG4;
        len <font color='#5555FF'>-</font><font color='#5555FF'>=</font> <font color='#979000'>4</font>;
    <b>}</b>
    buf4<font color='#5555FF'>+</font><font color='#5555FF'>+</font>;
    buf <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font> FAR <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>buf4;

    <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>len<font face='Lucida Console'>)</font> <font color='#0000FF'>do</font> <b>{</b>
        c <font color='#5555FF'>=</font> crc_table[<font color='#979000'>4</font>][<font face='Lucida Console'>(</font>c <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>24</font><font face='Lucida Console'>)</font> ^ <font color='#5555FF'>*</font>buf<font color='#5555FF'>+</font><font color='#5555FF'>+</font>] ^ <font face='Lucida Console'>(</font>c <font color='#5555FF'>&lt;</font><font color='#5555FF'>&lt;</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font>;
    <b>}</b> <font color='#0000FF'>while</font> <font face='Lucida Console'>(</font><font color='#5555FF'>-</font><font color='#5555FF'>-</font>len<font face='Lucida Console'>)</font>;
    c <font color='#5555FF'>=</font> ~c;
    <font color='#0000FF'>return</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font><font face='Lucida Console'>)</font><font face='Lucida Console'>(</font><font color='#BB00BB'>ZSWAP32</font><font face='Lucida Console'>(</font>c<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b>}</b>

<font color='#0000FF'>#endif</font> <font color='#009900'>/* BYFOUR */</font>

<font color='#0000FF'>#define</font> GF2_DIM <font color='#979000'>32</font>      <font color='#009900'>/* dimension of GF(2) vectors (length of CRC) */</font>

<font color='#009900'>/* ========================================================================= */</font>
local <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> <b><a name='gf2_matrix_times'></a>gf2_matrix_times</b><font face='Lucida Console'>(</font>mat, vec<font face='Lucida Console'>)</font>
    <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> <font color='#5555FF'>*</font>mat;
    <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> vec;
<b>{</b>
    <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> sum;

    sum <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
    <font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>vec<font face='Lucida Console'>)</font> <b>{</b>
        <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>vec <font color='#5555FF'>&amp;</font> <font color='#979000'>1</font><font face='Lucida Console'>)</font>
            sum ^<font color='#5555FF'>=</font> <font color='#5555FF'>*</font>mat;
        vec <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font><font color='#5555FF'>=</font> <font color='#979000'>1</font>;
        mat<font color='#5555FF'>+</font><font color='#5555FF'>+</font>;
    <b>}</b>
    <font color='#0000FF'>return</font> sum;
<b>}</b>

<font color='#009900'>/* ========================================================================= */</font>
local <font color='#0000FF'><u>void</u></font> <b><a name='gf2_matrix_square'></a>gf2_matrix_square</b><font face='Lucida Console'>(</font>square, mat<font face='Lucida Console'>)</font>
    <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> <font color='#5555FF'>*</font>square;
    <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> <font color='#5555FF'>*</font>mat;
<b>{</b>
    <font color='#0000FF'><u>int</u></font> n;

    <font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>n <font color='#5555FF'>=</font> <font color='#979000'>0</font>; n <font color='#5555FF'>&lt;</font> GF2_DIM; n<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font>
        square[n] <font color='#5555FF'>=</font> <font color='#BB00BB'>gf2_matrix_times</font><font face='Lucida Console'>(</font>mat, mat[n]<font face='Lucida Console'>)</font>;
<b>}</b>

<font color='#009900'>/* ========================================================================= */</font>
local uLong <b><a name='crc32_combine_'></a>crc32_combine_</b><font face='Lucida Console'>(</font>crc1, crc2, len2<font face='Lucida Console'>)</font>
    uLong crc1;
    uLong crc2;
    z_off64_t len2;
<b>{</b>
    <font color='#0000FF'><u>int</u></font> n;
    <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> row;
    <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> even[GF2_DIM];    <font color='#009900'>/* even-power-of-two zeros operator */</font>
    <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> odd[GF2_DIM];     <font color='#009900'>/* odd-power-of-two zeros operator */</font>

    <font color='#009900'>/* degenerate case (also disallow negative lengths) */</font>
    <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>len2 <font color='#5555FF'>&lt;</font><font color='#5555FF'>=</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font>
        <font color='#0000FF'>return</font> crc1;

    <font color='#009900'>/* put operator for one zero bit in odd */</font>
    odd[<font color='#979000'>0</font>] <font color='#5555FF'>=</font> <font color='#979000'>0xedb88320UL</font>;          <font color='#009900'>/* CRC-32 polynomial */</font>
    row <font color='#5555FF'>=</font> <font color='#979000'>1</font>;
    <font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>n <font color='#5555FF'>=</font> <font color='#979000'>1</font>; n <font color='#5555FF'>&lt;</font> GF2_DIM; n<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
        odd[n] <font color='#5555FF'>=</font> row;
        row <font color='#5555FF'>&lt;</font><font color='#5555FF'>&lt;</font><font color='#5555FF'>=</font> <font color='#979000'>1</font>;
    <b>}</b>

    <font color='#009900'>/* put operator for two zero bits in even */</font>
    <font color='#BB00BB'>gf2_matrix_square</font><font face='Lucida Console'>(</font>even, odd<font face='Lucida Console'>)</font>;

    <font color='#009900'>/* put operator for four zero bits in odd */</font>
    <font color='#BB00BB'>gf2_matrix_square</font><font face='Lucida Console'>(</font>odd, even<font face='Lucida Console'>)</font>;

    <font color='#009900'>/* apply len2 zeros to crc1 (first square will put the operator for one
       zero byte, eight zero bits, in even) */</font>
    <font color='#0000FF'>do</font> <b>{</b>
        <font color='#009900'>/* apply zeros operator for this bit of len2 */</font>
        <font color='#BB00BB'>gf2_matrix_square</font><font face='Lucida Console'>(</font>even, odd<font face='Lucida Console'>)</font>;
        <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>len2 <font color='#5555FF'>&amp;</font> <font color='#979000'>1</font><font face='Lucida Console'>)</font>
            crc1 <font color='#5555FF'>=</font> <font color='#BB00BB'>gf2_matrix_times</font><font face='Lucida Console'>(</font>even, crc1<font face='Lucida Console'>)</font>;
        len2 <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font><font color='#5555FF'>=</font> <font color='#979000'>1</font>;

        <font color='#009900'>/* if no more bits set, then done */</font>
        <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>len2 <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font>
            <font color='#0000FF'>break</font>;

        <font color='#009900'>/* another iteration of the loop with odd and even swapped */</font>
        <font color='#BB00BB'>gf2_matrix_square</font><font face='Lucida Console'>(</font>odd, even<font face='Lucida Console'>)</font>;
        <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>len2 <font color='#5555FF'>&amp;</font> <font color='#979000'>1</font><font face='Lucida Console'>)</font>
            crc1 <font color='#5555FF'>=</font> <font color='#BB00BB'>gf2_matrix_times</font><font face='Lucida Console'>(</font>odd, crc1<font face='Lucida Console'>)</font>;
        len2 <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font><font color='#5555FF'>=</font> <font color='#979000'>1</font>;

        <font color='#009900'>/* if no more bits set, then done */</font>
    <b>}</b> <font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>len2 <font color='#5555FF'>!</font><font color='#5555FF'>=</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font>;

    <font color='#009900'>/* return combined crc */</font>
    crc1 ^<font color='#5555FF'>=</font> crc2;
    <font color='#0000FF'>return</font> crc1;
<b>}</b>

<font color='#009900'>/* ========================================================================= */</font>
uLong ZEXPORT <b><a name='crc32_combine'></a>crc32_combine</b><font face='Lucida Console'>(</font>crc1, crc2, len2<font face='Lucida Console'>)</font>
    uLong crc1;
    uLong crc2;
    z_off_t len2;
<b>{</b>
    <font color='#0000FF'>return</font> <font color='#BB00BB'>crc32_combine_</font><font face='Lucida Console'>(</font>crc1, crc2, len2<font face='Lucida Console'>)</font>;
<b>}</b>

uLong ZEXPORT <b><a name='crc32_combine64'></a>crc32_combine64</b><font face='Lucida Console'>(</font>crc1, crc2, len2<font face='Lucida Console'>)</font>
    uLong crc1;
    uLong crc2;
    z_off64_t len2;
<b>{</b>
    <font color='#0000FF'>return</font> <font color='#BB00BB'>crc32_combine_</font><font face='Lucida Console'>(</font>crc1, crc2, len2<font face='Lucida Console'>)</font>;
<b>}</b>

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