80 lines
1.6 KiB
C++
80 lines
1.6 KiB
C++
//=============================================================================
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//
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// MODULE: ASN1Boolean.cxx
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//
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// Description:
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//
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// Implementation of ASN.1 boolean parsing logic
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//
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// Modification History
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//
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// Mark Pustilnik Date: 06/08/02 - created
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//
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//=============================================================================
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#include "ASN1Parser.hxx"
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//
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// Retrieve the value of an ASN.1-encoded Boolean
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//
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DWORD
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ASN1ParserBoolean::GetValue(
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IN OUT ASN1FRAME * Frame,
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OUT ASN1VALUE * Value
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)
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{
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DWORD dw;
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ASN1FRAME FrameIn = *Frame;
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DWORD DLength = DataLength( Frame );
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ULPBYTE Address = Frame->Address;
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if ( *Frame->Address != BuildDescriptor(
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ctUniversal,
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pcPrimitive,
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(BYTE)utBoolean ))
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{
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dw = ERROR_INVALID_USER_BUFFER;
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goto Cleanup;
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}
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//
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// Skip over the the descriptor
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//
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Address++;
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//
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// Skip over the length header
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//
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Address += HeaderLength( Address );
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Value->Address = Address;
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Value->Length = DLength;
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Value->ut = utBoolean;
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Value->dw = 0;
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for ( ULONG i = 0; i < DLength; i++ )
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{
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Value->dw <<= 8;
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Value->dw += *Address;
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Address++;
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}
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Value->b = ( Value->dw != 0 );
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Frame->Address = Address;
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dw = ERROR_SUCCESS;
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Cleanup:
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if ( dw != ERROR_SUCCESS )
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{
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*Frame = FrameIn;
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}
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return dw;
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}
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