86 lines
2.2 KiB
C++
86 lines
2.2 KiB
C++
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//
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// STORCMP.CPP
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//
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// Source file for ArchiveLib 1.0
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//
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// Copyright (c) Greenleaf Software, Inc. 1994
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// All Rights Reserved
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//
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// CONTENTS
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//
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// ALStorage::Compare()
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//
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// DESCRIPTION
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//
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// This file contains a single function from ALStorage. I'm not
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// sure why it is in a separate file.
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//
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// REVISION HISTORY
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//
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// May 26, 1994 1.0A : First release
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//
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//
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#include "arclib.h"
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#pragma hdrstop
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#include <string.h>
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#include "storage.h"
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#include "_openf.h"
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//
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// int ALStorage::Compare( ALStorage & test )
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//
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// ARGUMENTS:
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//
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// test : The storage object that will be compared to this.
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//
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// RETURNS
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//
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// AL_SUCCESS if the two files match. AL_COMPARE_ERROR if the files
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// don't match. An error code < AL_SUCCESS is possible if some other
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// error takes place during the process.
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//
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// DESCRIPTION
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//
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// This function provides a convenient way to test this object
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// against another. Note that if the comparison fails, the status
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// code of this object will be set to an error state. You will need
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// to clear that error if you intend to use this object again.
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//
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// REVISION HISTORY
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//
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// May 26, 1994 1.0A : First release
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//
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int AL_PROTO ALStorage::Compare( ALStorage AL_DLL_FAR & test )
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{
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ALOpenInputFile in1( test );
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ALOpenInputFile in2( *this );
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if ( test.mStatus < 0 )
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return mStatus = test.mStatus;
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if ( GetSize() != test.GetSize() )
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return mStatus.SetError( AL_COMPARE_ERROR,
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"Comparison failed. "
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"File %s and %s are two different sizes.",
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mName.GetSafeName(),
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test.mName.GetSafeName() );
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long position = 0;
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for ( ; ; ) {
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int c = ReadChar();
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if ( c < 0 )
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break;
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if ( c != test.ReadChar() )
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return mStatus.SetError( AL_COMPARE_ERROR,
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"File %s and %s differed at position %ld",
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mName.GetSafeName(),
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test.mName.GetSafeName(),
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position );
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position++;
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}
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return mStatus;
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}
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