115 lines
2.7 KiB
C++
115 lines
2.7 KiB
C++
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//
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// ENTRCR.CPP
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//
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// Source file for ArchiveLib 2.0
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//
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// Copyright (c) Greenleaf Software, Inc. 1994-1996
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// All Rights Reserved
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//
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// CONTENTS
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//
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// ALEntry::CompressionRatio()
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// ALEntryCompressionRatio()
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//
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// REVISION HISTORY
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//
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// February 14, 1996 2.0A : New release
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//
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#include "arclib.h"
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#if !defined( AL_IBM )
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#pragma hdrstop
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#endif
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//
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// NAME
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//
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// ALEntry::CompressionRatio()
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//
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// PLATFORMS/ENVIRONMENTS
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//
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// Console Windows PM
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// C++ C VB Delphi
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//
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// SHORT DESCRIPTION
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//
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// Return the compression ratio for an entry in terms of 0-100%
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//
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// C++ SYNOPSIS
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//
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// #include "arclib.h"
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//
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// int ALEntry::CompressionRatio()
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//
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// C SYNOPSIS
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//
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// #include "arclib.h"
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//
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// int ALEntryCompressionRatio( hALEntry this_object );
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//
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// VB SYNOPSIS
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//
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// Declare Function ALEntryCompressionRatio Lib "AL20LW"
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// (ByVal this_object&) As Integer
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//
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// DELPHI SYNOPSIS
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//
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// function ALEntryCompressionRatio( this_object : hALEntry ) : Integer;
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//
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// ARGUMENTS
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//
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// this_object : A reference or pointer to the ALEntry object that
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// you are intereseted in. Note that the C++
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// version of this call doesn't have an explicit argument
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// here, since it has access to 'this' implicitly.
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//
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// DESCRIPTION
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//
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// This calculates and returns the compression ratio. We don't store the
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// ratio in ALEntry, because it is so darned easy to calculate when
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// we need it. However, there are going to be times when we don't have
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// it.
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//
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// RETURNS
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//
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// The integer representing the compression ratio. The ratio is a number
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// from 0 to 100 (or maybe more) with 0 being perfect compression.
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//
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// It is possible to get a -1 back from this routine if the compression
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// ratio is not presently known. This will be the case if you have
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// not created the archive yet, or have a new object that hasn't been
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// inserted yet.
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//
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// EXAMPLE
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//
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// SEE ALSO
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//
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// REVISION HISTORY
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//
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// February 14, 1996 2.0A : New release
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//
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int AL_PROTO
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ALEntry::CompressionRatio() /* Tag public function */
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{
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long uncompressed_size = mpStorageObject->GetSize();
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if ( uncompressed_size <= 0 )
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return -1;
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if ( mlCompressedSize <= 0 )
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return -1;
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return (int) ( 100 * mlCompressedSize / uncompressed_size );
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}
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#if !defined( AL_NO_C )
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extern "C" AL_LINKAGE int AL_FUNCTION
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ALEntryCompressionRatio( hALEntry this_object ) /* Tag public function */
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{
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AL_ASSERT_OBJECT( this_object, ALEntry, "ALEntryCompressionRatio" );
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return ( (ALEntry *) this_object )->CompressionRatio();
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}
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#endif
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