mirror of https://github.com/vitalif/zbackup
36 lines
873 B
C++
36 lines
873 B
C++
// Copyright (c) 2012-2014 Konstantin Isakov <ikm@zbackup.org> and ZBackup contributors, see CONTRIBUTORS
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// Part of ZBackup. Licensed under GNU GPLv2 or later + OpenSSL, see LICENSE
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#ifndef ADLER32_HH_INCLUDED
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#define ADLER32_HH_INCLUDED
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#include <zlib.h>
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#include <stdint.h>
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#include <stddef.h>
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/// A simple wrapper to calculate adler32
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class Adler32
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{
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public:
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typedef uint32_t Value;
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Adler32(): value( ( Value ) adler32( 0, 0, 0 ) ) {}
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void add( void const * data, size_t size )
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{
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// When size is 0, we assume a no-op was requested and 'data' should be
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// ignored. However, adler32() has a special semantic for NULL 'data'.
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// Therefore we check the size before calling it
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if ( size )
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value = ( Value ) adler32( value, ( Bytef const * ) data, size );
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}
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Value result() const
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{ return value; }
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private:
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Value value;
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};
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#endif
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