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383 lines
7.1 KiB
383 lines
7.1 KiB
/*++
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Copyright (C) Microsoft Corporation, 1995 - 1999
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Module Name:
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buffers
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Abstract:
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This module provides the run time code to support the CBuffer object.
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Author:
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Doug Barlow (dbarlow) 11/7/1995
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Environment:
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Win32, C++ w/ Exceptions
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Notes:
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None
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--*/
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#endif
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#include <windows.h>
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#include <SCardLib.h>
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/*++
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CBuffer:
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This constructor is a special case for use explicitly with the operator+
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routine. It builds a CBuffer out of the other two with only a single
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allocation.
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Arguments:
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bfSourceOne supplies the first part of the new buffer
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bfSourceTwo supplies the second part of the new buffer.
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Return Value:
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None
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Author:
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Doug Barlow (dbarlow) 11/7/1995
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--*/
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CBuffer::CBuffer( // Object assignment constructor.
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IN const CBuffer &bfSourceOne,
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IN const CBuffer &bfSourceTwo)
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{
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Initialize();
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Presize(bfSourceOne.m_cbDataLength + bfSourceTwo.m_cbDataLength);
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Set(bfSourceOne.m_pbBuffer, bfSourceOne.m_cbDataLength);
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Append(bfSourceTwo.m_pbBuffer, bfSourceTwo.m_cbDataLength);
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}
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/*++
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Clear:
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This routine resets a CBuffer to it's initial state, freeing any allocated
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memory.
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Arguments:
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None
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Return Value:
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None
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Author:
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Doug Barlow (dbarlow) 10/5/1995
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--*/
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void
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CBuffer::Clear(
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void)
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{
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if (NULL != m_pbBuffer)
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delete[] m_pbBuffer;
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Initialize();
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}
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/*++
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Reset:
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This routine logically empties the CBuffer without actually deallocating
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memory. It's data lengh goes to zero.
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Arguments:
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None
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Return Value:
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The address of the buffer.
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Author:
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Doug Barlow (dbarlow) 10/5/1995
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--*/
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LPBYTE
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CBuffer::Reset(
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void)
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{
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m_cbDataLength = 0;
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return m_pbBuffer;
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}
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/*++
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Presize:
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This is the primary workhorse of the CBuffer class. It ensures that the
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size of the buffer is of the proper size. Data in the buffer may optionally
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be preserved, in which case the data length doesn't change. If the buffer
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is not preserved, then the data length is reset to zero.
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Arguments:
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cbLength supplies the desired length of the buffer.
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fPreserve supplies a flag indicating whether or not to preserve the current
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contents of the buffer.
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Return Value:
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The address of the properly sized buffer.
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Author:
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Doug Barlow (dbarlow) 10/5/1995
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--*/
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LPBYTE
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CBuffer::Presize(
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IN DWORD cbLength,
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IN BOOL fPreserve)
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{
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LPBYTE pbNewBuf = NULL;
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if (fPreserve && (0 < m_cbDataLength))
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{
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//
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// Increase the buffer length, and preserve the existing data.
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//
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if (m_cbBufferLength < cbLength)
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{
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pbNewBuf = new BYTE[cbLength];
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if (NULL == pbNewBuf)
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throw (DWORD)ERROR_OUTOFMEMORY;
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memcpy(pbNewBuf, m_pbBuffer, m_cbDataLength);
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delete[] m_pbBuffer;
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m_pbBuffer = pbNewBuf;
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m_cbBufferLength = cbLength;
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}
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}
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else
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{
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//
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// Increase the buffer length, but lose any existing data.
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//
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if (m_cbBufferLength < cbLength)
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{
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pbNewBuf = new BYTE[cbLength];
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if (NULL == pbNewBuf)
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throw (DWORD)ERROR_OUTOFMEMORY;
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if (NULL != m_pbBuffer)
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delete[] m_pbBuffer;
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m_pbBuffer = pbNewBuf;
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m_cbBufferLength = cbLength;
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}
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m_cbDataLength = 0;
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}
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return m_pbBuffer;
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}
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/*++
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Resize:
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This method sets the length of the data to the given size. If the buffer
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isn't big enough to support that data length, it is enlarged.
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Arguments:
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cbLength supplies the new length of the data.
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fPreserve supplies a flag indicating whether or not to preserve existing
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data.
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Return Value:
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The address of the buffer.
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Author:
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Doug Barlow (dbarlow) 10/5/1995
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--*/
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LPBYTE
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CBuffer::Resize(
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DWORD cbLength,
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BOOL fPreserve)
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{
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LPBYTE pb = Presize(cbLength, fPreserve);
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m_cbDataLength = cbLength;
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return pb;
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}
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/*++
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Set:
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This method sets the contents of the data to the given value. If the buffer
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isn't big enough to hold the given data, it is enlarged.
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Arguments:
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pbSource supplies the data to place in the data buffer.
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cbLength supplies the length of that data, in bytes.
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Return Value:
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The address of the buffer.
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Author:
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Doug Barlow (dbarlow) 10/5/1995
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--*/
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LPBYTE
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CBuffer::Set(
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IN const BYTE * const pbSource,
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IN DWORD cbLength)
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{
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LPBYTE pb = Presize(cbLength, FALSE);
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if (0 < cbLength)
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memcpy(pb, pbSource, cbLength);
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m_cbDataLength = cbLength;
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return pb;
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}
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/*++
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CBuffer::Append:
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This method appends the supplied data onto the end of the existing data,
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enlarging the buffer if necessary.
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Arguments:
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pbSource supplies the data to be appended.
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cbLength supplies the length of the data to be appended, in bytes.
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Return Value:
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The address of the buffer.
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Author:
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Doug Barlow (dbarlow) 10/5/1995
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--*/
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LPBYTE
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CBuffer::Append(
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IN const BYTE * const pbSource,
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IN DWORD cbLength)
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{
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LPBYTE pb = m_pbBuffer;
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if (0 < cbLength)
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{
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pb = Presize(m_cbDataLength + cbLength, TRUE);
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memcpy(&pb[m_cbDataLength], pbSource, cbLength);
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m_cbDataLength += cbLength;
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}
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return pb;
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}
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/*++
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CBuffer::Compare:
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This method compares the contents of another CBuffer to this one, and
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returns a value indicating a comparative value.
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Arguments:
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bfSource supplies the other buffer.
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Return Value:
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< 0 - The other buffer is less than this one.
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= 0 - The other buffer is identical to this one.
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> 0 - The other buffer is greater than this one.
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Author:
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Doug Barlow (dbarlow) 10/5/1995
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--*/
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int
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CBuffer::Compare(
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const CBuffer &bfSource)
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const
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{
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if (m_cbDataLength < bfSource.m_cbDataLength)
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return -1;
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else if (m_cbDataLength > bfSource.m_cbDataLength)
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return 1;
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else if (0 < m_cbDataLength)
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return memcmp(m_pbBuffer, bfSource.m_pbBuffer, m_cbDataLength);
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else
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return 0;
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}
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/*++
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operator+:
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This routine is a special operator that allows addition of two CBuffers to
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produce a third, a la bfThree = bfOne + bfTwo. It calls the special
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protected constructor of CBuffer.
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Arguments:
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bfSourceOne supplies the first buffer
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bfSourceTwo supplies the second buffer
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Return Value:
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A reference to a temporary CBuffer that is the concatenation of the two
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provided buffers.
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Author:
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Doug Barlow (dbarlow) 10/5/1995
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--*/
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#pragma warning (disable : 4172)
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CBuffer &
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operator+(
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IN const CBuffer &bfSourceOne,
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IN const CBuffer &bfSourceTwo)
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{
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return CBuffer(bfSourceOne, bfSourceTwo);
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}
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#pragma warning (default : 4172)
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