filter/source/placeware/Base64Codec.cxx

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  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_filter.hxx"
  33 #include "Base64Codec.hxx"
  34 #include <rtl/ustrbuf.hxx>
  35 #include <osl/diagnose.h>
  36 using namespace rtl;
  37 using namespace osl;
  38 using namespace com::sun::star;
  39
  40 const
  41   sal_Char aBase64EncodeTable[] =
  42     { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
  43       'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
  44       'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
  45       'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
  46       '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' };
  47
  48 const
  49   sal_uInt8 aBase64DecodeTable[]  =
  50     { 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, // 0-15
  51
  52       0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, // 16-31
  53
  54       0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 62,  0,  0,  0, 63, // 32-47
  55 //                                                +               /
  56
  57      52, 53, 54, 55, 56, 57, 58, 59, 60, 61,  0,  0,  0,  0,  0,  0, // 48-63
  58 //    0   1   2   3   4   5   6   7   8   9               =
  59
  60       0,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, // 64-79
  61 //        A   B   C   D   E   F   G   H   I   J   K   L   M   N   O
  62
  63      15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,  0,  0,  0,  0,  0, // 80-95
  64 //    P   Q   R   S   T   U   V   W   X   Y   Z
  65
  66       0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, // 96-111
  67 //        a   b   c   d   e   f   g   h   i   j   k   l   m   n   o
  68
  69      41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,  0,  0,  0,  0,  0, // 112-127
  70 //    p   q   r   s   t   u   v   w   x   y   z
  71
  72       0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
  73       0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
  74       0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
  75       0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
  76       0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
  77       0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
  78       0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
  79       0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0};
  80
  81
  82 void ThreeByteToFourByte (const sal_uInt8* pBuffer, const sal_Int32 nStart, const sal_Int32 nFullLen, rtl::OUStringBuffer& sBuffer)
  83 {
  84     sal_Int32 nLen(nFullLen - nStart);
  85     if (nLen > 3)
  86         nLen = 3;
  87     if (nLen == 0)
  88     {
  89         sBuffer.setLength(0);
  90         return;
  91     }
  92
  93     sal_Int32 nBinaer;
  94     switch (nLen)
  95     {
  96         case 1:
  97         {
  98             nBinaer = ((sal_uInt8)pBuffer[nStart + 0]) << 16;
  99         }
 100         break;
 101         case 2:
 102         {
 103             nBinaer = (((sal_uInt8)pBuffer[nStart + 0]) << 16) +
 104                     (((sal_uInt8)pBuffer[nStart + 1]) <<  8);
 105         }
 106         break;
 107         default:
 108         {
 109             nBinaer = (((sal_uInt8)pBuffer[nStart + 0]) << 16) +
 110                     (((sal_uInt8)pBuffer[nStart + 1]) <<  8) +
 111                     ((sal_uInt8)pBuffer[nStart + 2]);
 112         }
 113         break;
 114     }
 115
 116     sBuffer.appendAscii("====");
 117
 118     sal_uInt8 nIndex = static_cast< sal_uInt8 >((nBinaer & 0xFC0000) >> 18);
 119     sBuffer.setCharAt(0, aBase64EncodeTable [nIndex]);
 120
 121     nIndex = static_cast< sal_uInt8 >((nBinaer & 0x3F000) >> 12);
 122     sBuffer.setCharAt(1, aBase64EncodeTable [nIndex]);
 123     if (nLen == 1)
 124         return;
 125
 126     nIndex = static_cast< sal_uInt8 >((nBinaer & 0xFC0) >> 6);
 127     sBuffer.setCharAt(2, aBase64EncodeTable [nIndex]);
 128     if (nLen == 2)
 129         return;
 130
 131     nIndex = static_cast< sal_uInt8 >((nBinaer & 0x3F));
 132     sBuffer.setCharAt(3, aBase64EncodeTable [nIndex]);
 133 }
 134
 135 void Base64Codec::encodeBase64(rtl::OUStringBuffer& aStrBuffer, const uno::Sequence < sal_Int8 >& aPass)
 136 {
 137     sal_Int32 i(0);
 138     sal_Int32 nBufferLength(aPass.getLength());
 139     const sal_Int8* pBuffer = aPass.getConstArray();
 140     while (i < nBufferLength)
 141     {
 142         rtl::OUStringBuffer sBuffer;
 143         ThreeByteToFourByte ((const sal_uInt8*)pBuffer, i, nBufferLength, sBuffer);
 144         aStrBuffer.append(sBuffer);
 145         i += 3;
 146     }
 147 }
 148
 149 const rtl::OUString s2equal(RTL_CONSTASCII_USTRINGPARAM("=="));
 150 const rtl::OUString s1equal(RTL_CONSTASCII_USTRINGPARAM("="));
 151 #if 0
 152 void FourByteToThreeByte (sal_uInt8* pBuffer, sal_Int32& nLength, const sal_Int32 nStart, const rtl::OUString& sString)
 153 {
 154     nLength = 0;
 155     sal_Int32 nLen (sString.getLength());
 156
 157     if (nLen != 4)
 158     {
 159         return;
 160     }
 161
 162
 163     if (sString.indexOf(s2equal) == 2)
 164         nLength = 1;
 165     else if (sString.indexOf(s1equal) == 3)
 166         nLength = 2;
 167     else
 168         nLength = 3;
 169
 170     sal_Int32 nBinaer ((aBase64DecodeTable [sString [0]] << 18) +
 171             (aBase64DecodeTable [sString [1]] << 12) +
 172             (aBase64DecodeTable [sString [2]] <<  6) +
 173             (aBase64DecodeTable [sString [3]]));
 174
 175     sal_uInt8 OneByte = static_cast< sal_uInt8 >((nBinaer & 0xFF0000) >> 16);
 176     pBuffer[nStart + 0] = (sal_uInt8)OneByte;
 177
 178     if (nLength == 1)
 179         return;
 180
 181     OneByte = static_cast< sal_uInt8 >((nBinaer & 0xFF00) >> 8);
 182     pBuffer[nStart + 1] = (sal_uInt8)OneByte;
 183
 184     if (nLength == 2)
 185         return;
 186
 187     OneByte = static_cast< sal_uInt8 >(nBinaer & 0xFF);
 188     pBuffer[nStart + 2] = (sal_uInt8)OneByte;
 189 }
 190
 191 void Base64Codec::decodeBase64(uno::Sequence< sal_uInt8 >& aBuffer, const rtl::OUString& sBuffer)
 192 {
 193     sal_Int32 nFirstLength((sBuffer.getLength() / 4) * 3);
 194     sal_uInt8* pBuffer = new sal_uInt8[nFirstLength];
 195     sal_Int32 nSecondLength(0);
 196     sal_Int32 nLength(0);
 197     sal_Int32 i = 0;
 198     sal_Int32 k = 0;
 199     while (i < sBuffer.getLength())
 200     {
 201         FourByteToThreeByte (pBuffer, nLength, k, sBuffer.copy(i, 4));
 202         nSecondLength += nLength;
 203         nLength = 0;
 204         i += 4;
 205         k += 3;
 206     }
 207     aBuffer = uno::Sequence<sal_uInt8>(pBuffer, nSecondLength);
 208     delete[] pBuffer;
 209 }
 210 #endif