perplex.cpp
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上传日期:2007-06-06
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文件大小:20k
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- //*******************************************************************
- //*************************** INCLUDE FILES *************************
- //*******************************************************************
- #include "perplex.h"
- #include "hxassert.h"
- #include "hlxclib/string.h"
- // #include "hlxclib/stdio.h"
- #include "netbyte.h"
- #include "hxheap.h"
- #ifdef _DEBUG
- #undef HX_THIS_FILE
- static const char HX_THIS_FILE[] = __FILE__;
- #endif
- //*******************************************************************
- //************************* INTERFACE LISTING ***********************
- //*******************************************************************
- BEGIN_INTERFACE_LIST(CHXPerplex)
- INTERFACE_LIST_ENTRY(IID_IHXPerplex, IHXPerplex)
- END_INTERFACE_LIST
- //*******************************************************************
- //*************************** CONSTRUCTOR ***************************
- //*******************************************************************
- CHXPerplex::CHXPerplex()
- {
- ;
- }
- //*******************************************************************
- //*************************** DESTRUCTOR ****************************
- //*******************************************************************
- CHXPerplex::~CHXPerplex()
- {
- ;
- }
- //*******************************************************************
- //*************************** Perplex() *****************************
- //*******************************************************************
- STDMETHODIMP CHXPerplex::Perplex(IHXBuffer *pInBuf, IHXBuffer *pOutBuf)
- {
- UINT32 FinalLen; // length of encoded data
- CHXPerplexBuffer pInPBuf; // Temp buffer to keep code
- // copy the IRMA Input Buffer into the CHXPerplex Input Buffer
- pInPBuf.SafeMemCopy(0, (const void*) pInBuf->GetBuffer(), (UINT32)pInBuf->GetSize());
- // Make sure the input buffer size is a multiple of 4bytes as
- // needed by Perplex alg. Padding with ' ' otherwise.
- UINT32 nAlign = (pInBuf->GetSize()) % sizeof(ULONG32);
- UINT32 Offset = (UINT32)pInBuf->GetSize();
- if (nAlign > 0)
- {
- pInPBuf.EnsureValidOffset(Offset+sizeof(ULONG32)-nAlign);
- for (; nAlign < sizeof(ULONG32); nAlign++)
- {
- pInPBuf.SetUCHAR(Offset++,0);
- }
- }
- FinalLen = Offset * Perplex_PER_ULONG32 / sizeof(ULONG32); // calc size of the outout (Perplexed) buffer.
- // alloc mem for final perplexed buffer
- // Add one to length 'cause low level perplex adds
- // a ' ' to the resulting string
- pOutBuf->SetSize(FinalLen+1);
- if (pOutBuf->GetBuffer() == NULL) return(HXR_FAIL);
-
- CHXPerplex::DumpToPerplex((char*)(pOutBuf->GetBuffer()), FinalLen+1, pInPBuf.GetPtr(), Offset);
- return(HXR_OK);
- }
- //*******************************************************************
- //*************************** DePerplex() ***************************
- //*******************************************************************
- // Parameters:
- //
- // const char* Perplex
- // Pointer to a buffer that contains a Perplexidecimal encoding
- //
- // UCHAR* Bits
- // Pointer to a buffer that will contain decoded bytes of information
- //
- // int nSize
- // Input size in bytes
- STDMETHODIMP CHXPerplex::DePerplex(IHXBuffer *pInBuf, IHXBuffer *pOutBuf)
- {
- const char* pPerplex = (const char *)pInBuf->GetBuffer();
- UCHAR* Bits = NULL;
- UINT32 nSize = pInBuf->GetSize();
- if (!nSize)
- {
- pOutBuf->SetSize(0);
- return HXR_OK;
- }
-
- nSize--; // -1 is for the extra character added in Perplex
- UINT32 ndxBits;
- UINT32 ndxPerplex = 0;
- ULONG32 temp32;
- UINT32 ulOutSize = 2*nSize+100;
- pOutBuf->SetSize(ulOutSize); // Make it bigger since the real size isn't known yet
- Bits = (UCHAR *)pOutBuf->GetBuffer();
- for (ndxBits = 0; ndxPerplex < nSize; )
- {
- temp32 = FromPerplex(&pPerplex[ndxPerplex]);
- ndxPerplex+=Perplex_PER_ULONG32;
- if (ndxBits+4 <= ulOutSize) memcpy(&Bits[ndxBits],&temp32,sizeof(temp32)); /* Flawfinder: ignore */
- ndxBits+=sizeof(temp32);
- }
- pOutBuf->SetSize(ndxBits);
- return HXR_OK;
- }
- //*******************************************************************
- //************************* MapFromPerplex **************************
- //*******************************************************************
- // Converts appropriate characters for Perplex encoding into a ULONG32.
- // A copy of this is kept in in pnmiscpubwinpnmisc16.h. If you change
- // this (which is very unlikely), then be sure to change it there.
- static const char zPerplexChars[] =
- {
- '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
- 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
- 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
- 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D',
- 'E'
- };
- UCHAR CHXPerplex::MapFromPerplex(char Perplex)
- {
- UCHAR temp = sizeof(zPerplexChars)/sizeof(zPerplexChars[0]);
- for (UCHAR n = 0; n < temp; n++)
- {
- if (Perplex == zPerplexChars[n]) return n;
- }
- return 0;
- }
- //*******************************************************************
- //*************************** MapToPerplex **************************
- //*******************************************************************
- // Converts a digit ordinal to the Perplex digit...
- char CHXPerplex::MapToPerplex(UCHAR cPerplex)
- {
- #ifdef _DEBUG
- int size_zPerplexChars = sizeof(zPerplexChars);
- int size_zPerplexChars0 = sizeof(zPerplexChars[0]);
- HX_ASSERT(cPerplex < size_zPerplexChars/size_zPerplexChars0);
- #endif
- return zPerplexChars[cPerplex];
- }
- //*******************************************************************
- //*************************** FromPerplex ***************************
- //*******************************************************************
- // Converts appropriate characters for Perplex encoding into a ULONG32.
- ULONG32 CHXPerplex::FromPerplex(const char* Perplex)
- {
- ULONG32 value = 0;
- ULONG32 PerplexBase = 1;
- for (int n = 0; n < Perplex_PER_ULONG32; n++)
- {
- value += MapFromPerplex(Perplex[n]) * PerplexBase;
- PerplexBase *= Perplex_BASE;
- }
- // Convert to local byte order!
- value = DwToHost(value);
- return value;
- }
- //*******************************************************************
- //**************************** ToPerplex ****************************
- //*******************************************************************
- // Converts a ULONG32 into the appropriate characters for Perplex encoding.
- void CHXPerplex::ToPerplex(ULONG32 Input, char* pPerplex)
- {
- ULONG32 value;
- UCHAR charValue;
- value = DwToNet(Input); // Convert to net byte order!
- for (int n=0; n < Perplex_PER_ULONG32; n++)
- {
- charValue = (UCHAR)(value % Perplex_BASE);
- pPerplex[n] = MapToPerplex(charValue);
- value = value / Perplex_BASE;
- }
- }
- //*******************************************************************
- //*************************** DumpToPerplex *************************
- //*******************************************************************
- // Parameters:
- //
- // char* pPerplex
- // Pointer to buffer to be filled with Perplexadecimal
- void CHXPerplex::DumpToPerplex(char* pPerplex, UINT32 ulPerplexSize, UCHAR* Bits, UINT32 nSize)
- {
- UINT32 ndxBits;
- UINT32 ndxPerplex = 0;
- ULONG32 temp32;
- for (ndxBits = 0; ndxBits < nSize; )
- {
- if (ndxBits+4 <= nSize) memcpy(&temp32,&Bits[ndxBits],sizeof(temp32)); /* Flawfinder: ignore */
- ndxBits+=sizeof(temp32);
- if (ndxPerplex+Perplex_PER_ULONG32 <= ulPerplexSize) ToPerplex(temp32,&pPerplex[ndxPerplex]);
- ndxPerplex+=Perplex_PER_ULONG32;
- }
- pPerplex[ndxPerplex] = ' ';
- }
- //*******************************************************************
- //***** ******
- //***** ******
- //***** ******
- //***** ******
- //***** ******
- //***** ******
- //***** CHXPerplexBuffer ******
- //***** ******
- //***** ******
- //***** ******
- //***** ******
- //***** ******
- //***** ******
- //*******************************************************************
- //*******************************************************************
- //****************** CHXPerplexBuffer CONSTRUCTOR *******************
- //*******************************************************************
- CHXPerplexBuffer::CHXPerplexBuffer()
- : m_nSize(0), m_pData(NULL), m_nGrowBy(DEFAULT_GROW_SIZE)
- {
- }
- //*******************************************************************
- //****************** CHXPerplexBuffer CONSTRUCTOR *******************
- //*******************************************************************
- CHXPerplexBuffer::CHXPerplexBuffer(UINT32 nSize, UINT32 nGrowBy)
- : m_nSize(0), m_pData(NULL), m_nGrowBy(nGrowBy)
- {
- Resize(nSize);
- }
- //*******************************************************************
- //******************* CHXPerplexBuffer DESTRUCTOR *******************
- //*******************************************************************
- CHXPerplexBuffer::~CHXPerplexBuffer()
- {
- Free();
- }
- //*******************************************************************
- //****************** CHXPerplexBuffer::IsValidOffset() **************
- //*******************************************************************
- inline BOOL CHXPerplexBuffer::IsValidOffset(UINT32 n) const
- {
- if (n<m_nSize)
- return(TRUE);
- else return(FALSE);
- }
- //*******************************************************************
- //*************** CHXPerplexBuffer::EnsureValidOffset() *************
- //*******************************************************************
- // make sure that pPos is in the buffer.
- // If not, the buffer is automatically resized and contents copied.
- // pPos must be > pData.
- BOOL CHXPerplexBuffer::EnsureValidOffset(UINT32 n)
- {
- if (IsValidOffset(n)==TRUE)
- {
- return(TRUE);
- }
- return (this->Resize(n));
- }
- //*******************************************************************
- //********************* CHXPerplexBuffer::Resize() ******************
- //*******************************************************************
- BOOL CHXPerplexBuffer::Resize(UINT32 nNewSize)
- {
- if (nNewSize==0)
- {
- Free();
- return(TRUE);
- }
- nNewSize = RoundUpToGrowSize(nNewSize);
- UCHAR* pNewBuffer = new UCHAR[nNewSize];
- if (pNewBuffer==NULL) return(FALSE);
- if (m_pData!=NULL)
- {
- // copy MIN(oldSize,newSize) elements
- memcpy(pNewBuffer,m_pData, (nNewSize<m_nSize) ? (int)nNewSize : (int)m_nSize); /* Flawfinder: ignore */
- delete [] m_pData;
- }
- m_pData = pNewBuffer;
- m_nSize = nNewSize;
- return(TRUE);
- }
- //*******************************************************************
- //**************** CHXPerplexBuffer::RoundUpToGrowSize() ************
- //*******************************************************************
- UINT32 CHXPerplexBuffer::RoundUpToGrowSize(UINT32 nSize)
- {
- // check for div-by-zero errors (as long as DEFAULT!=0)
- if (m_nGrowBy==0)
- {
- m_nGrowBy = DEFAULT_GROW_SIZE;
- }
- return ( (int)(nSize/m_nGrowBy)+1 ) * m_nGrowBy;
- }
- //*******************************************************************
- //****************** CHXPerplexBuffer::SafeMemCopy() ****************
- //*******************************************************************
- // copy data into the buffer at the given offset, and if the buffer
- // is too small we'll resize the buffer first.
- BOOL CHXPerplexBuffer::SafeMemCopy(UINT32 nOffset, const void* data, UINT32 len)
- {
- if (EnsureValidOffset(nOffset+len-1)==TRUE)
- {
- memcpy( m_pData+nOffset, data, (int)len ); /* Flawfinder: ignore */
- return(TRUE);
- }
- return(FALSE);
- }
- //*******************************************************************
- //********************** CHXPerplexBuffer::Free() *******************
- //*******************************************************************
- void CHXPerplexBuffer::Free()
- {
- if (m_pData!=NULL)
- delete [] m_pData;
- m_pData=NULL;
- m_nSize=0;
- }
- //*******************************************************************
- //************************** FourByteAlign **************************
- //*******************************************************************
- /* already in pnmisc.lib
- UINT16 FourByteAlign(UINT16 number)
- {
- return( ((number+3)>>2)<<2 );
- }
- */
- //*******************************************************************
- //************************ MapFromMIMEBase64 ************************
- //*******************************************************************
- // Converts appropriate characters for MIME-Base64 encoding into a the
- // Base64 ordinal.
- // A copy of this is kept in in pnmiscpubwinpnmisc16.h. If you change
- // this (which is very unlikely), then be sure to change it there.
- static const char zMIMEBase64Chars[] =
- {
- 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
- 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
- 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
- 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
- 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
- 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
- '8', '9', '+', '/'
- };
- #define MIME_BASE64_PADDING '='
- #define FROM_MIME_BASE64_BYTES_IN 4
- #define FROM_MIME_BASE64_BYTES_OUT 3
- #define TO_MIME_BASE64_BYTES_IN FROM_MIME_BASE64_BYTES_OUT
- #define TO_MIME_BASE64_BYTES_OUT FROM_MIME_BASE64_BYTES_IN
- UCHAR CHXPerplex::MapFromMIMEBase64(char MIMEBase64)
- {
- for (UCHAR n = 0; n < sizeof(zMIMEBase64Chars)/sizeof(zMIMEBase64Chars[0]); n++)
- {
- if (MIMEBase64 == zMIMEBase64Chars[n])
- {
- return n;
- }
- }
- HX_ASSERT(FALSE);
- return 0;
- }
- //*******************************************************************
- //************************ MapFromMIMEBase64 ************************
- //*******************************************************************
- // Converts a digit ordinal to the MIMEBase64 digit...
- char CHXPerplex::MapToMIMEBase64(UCHAR MIMEBase64)
- {
- HX_ASSERT(MIMEBase64 < sizeof(zMIMEBase64Chars)/sizeof(zMIMEBase64Chars[0]));
- return zMIMEBase64Chars[MIMEBase64];
- }
- //*******************************************************************
- //************************ SetFromMIMEBase64 ************************
- //*******************************************************************
- // Return: int Size in bytes of decoded information
- UINT32 CHXPerplex::SetFromMIMEBase64(const char* MIMEBase64, char* Bits, UINT32 nSize)
- {
- UINT32 ndxBits = 0;
- UINT32 ndxMIMEBase64 = 0;
- BOOL bDone = FALSE;
- UINT32 ndxTempIn = 0;
- UCHAR tempBitsIn[FROM_MIME_BASE64_BYTES_IN];
- UINT32 padding = 0;
- HX_ASSERT(strlen(MIMEBase64) <= nSize);
- while (!bDone)
- {
- HX_ASSERT(ndxMIMEBase64 <= nSize);
- HX_ASSERT(ndxBits <= nSize);
- // Fill in our "temporary" in buffer with the Base64 characters.
- for (ndxTempIn = 0;
- ndxTempIn < FROM_MIME_BASE64_BYTES_IN && (padding == 0);
- ndxTempIn++)
- {
- HX_ASSERT(ndxMIMEBase64 <= nSize);
- UCHAR MIMEBase64char = MIMEBase64[ndxMIMEBase64];
- switch (MIMEBase64char)
- {
- case MIME_BASE64_PADDING:
- case ' ':
- {
- tempBitsIn[ndxTempIn] = 0;
- bDone = TRUE;
- padding = (FROM_MIME_BASE64_BYTES_IN - ndxTempIn);
- }
- break;
- default:
- {
- tempBitsIn[ndxTempIn] = MapFromMIMEBase64(MIMEBase64char);
- }
- break;
- }
- ndxMIMEBase64++;
- }
- HX_ASSERT(padding == 2 || padding == 1 || padding == 0);
- // Map the Base64 in buffer to the the output buffer...
- // This should map the 6 pertinate bits of each IN byte, to the
- // the correct bits of the OUT byte.
- {
- Bits[ndxBits] = (tempBitsIn[0] << 2) + (tempBitsIn[1]>>4);
- ndxBits++;
- if (padding < 2)
- {
- Bits[ndxBits] = (tempBitsIn[1] << 4) + (tempBitsIn[2]>>2);
- ndxBits++;
- }
- if (padding < 1)
- {
- Bits[ndxBits] = (tempBitsIn[2] << 6) + (tempBitsIn[3]);
- ndxBits++;
- }
- }
- }
- Bits[ndxBits] = ' ';
- return ndxBits;
- }
- //*******************************************************************
- //************************ DumpToMIMEBase64 *************************
- //*******************************************************************
- void CHXPerplex::DumpToMIMEBase64(char* MIMEBase64, const char* Bits, UINT32 nSize)
- {
- UINT32 ndxBits = 0;
- UINT32 ndxMIMEBase64 = 0;
- BOOL bDone = FALSE;
- UINT32 ndxTempIn = 0;
- UINT32 ndxTempOut = 0;
- UCHAR tempBitsIn [FROM_MIME_BASE64_BYTES_IN];
- UINT32 padding = 0;
- HX_ASSERT(strlen(Bits) <= nSize);
- while (!bDone)
- {
- HX_ASSERT(ndxMIMEBase64 <= nSize);
- HX_ASSERT(ndxBits <= nSize);
- // Fill in our "temporary" out buffer with the 6 bit chunks of the input.
- for ( ndxTempIn = 0;
- ndxTempIn < TO_MIME_BASE64_BYTES_IN && (padding == 0);
- ndxTempIn++)
- {
- UCHAR rawChar = Bits[ndxBits];
- if (rawChar != ' ')
- {
- switch (ndxTempIn)
- {
- case 0:
- {
- tempBitsIn[0] = rawChar >> 2;
- tempBitsIn[1] = (rawChar & 0x3) << 4;
- }
- break;
- case 1:
- {
- tempBitsIn[1] += rawChar >> 4;
- tempBitsIn[2] = (rawChar & 0xF) << 2;
- }
- break;
- case 2:
- {
- tempBitsIn[2] += rawChar >> 6;
- tempBitsIn[3] = (rawChar & 0x3F);
- }
- break;
- }
- }
- else
- {
- bDone = TRUE;
- padding = (TO_MIME_BASE64_BYTES_IN - ndxTempIn);
- }
- ndxBits++;
- }
- HX_ASSERT(padding == 2 || padding == 1 || padding == 0);
- // Map the Base64 in buffer to the output buffer...
- // This should map the 6 pertinate bits of each IN byte, as an
- // entire OUT byte
- for ( ndxTempOut = 0;
- ndxTempOut < TO_MIME_BASE64_BYTES_OUT;
- ndxTempOut++)
- {
- if (ndxTempOut < (TO_MIME_BASE64_BYTES_OUT-padding))
- {
- MIMEBase64[ndxMIMEBase64] = MapToMIMEBase64(tempBitsIn[ndxTempOut]);
- }
- else
- {
- MIMEBase64[ndxMIMEBase64] = MIME_BASE64_PADDING;
- }
- ndxMIMEBase64++;
- }
- }
- MIMEBase64[ndxMIMEBase64] = ' ';
- }