xfbase64.cxx

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/*************************************************************************
 * @file
 * Base64 tool.
 ************************************************************************/
#include <string.h>
#include <memory>
#include "xfbase64.hxx"
 
const  char aBase64EncodeTable[] =
{ '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', '+', '/' };
 
static void Encode_(const sal_uInt8 *src, char* dest)
{
    sal_Int32 nBinaer = (src[ 0] << 16) +
        (src[1] <<  8) +
        (src[2]);
 
    sal_uInt8 nIndex = ((nBinaer & 0xFC0000) >> 18);
    dest[0] = aBase64EncodeTable [nIndex];
 
    nIndex = (nBinaer & 0x3F000) >> 12;
    dest[1] =aBase64EncodeTable [nIndex];
 
    nIndex = (nBinaer & 0xFC0) >> 6;
    dest[2] = aBase64EncodeTable [nIndex];
 
    nIndex = (nBinaer & 0x3F);
    dest[3] = aBase64EncodeTable [nIndex];
}
 
OUString XFBase64::Encode(sal_uInt8 const *buf, sal_Int32 len)
{
    std::unique_ptr<char[]> buffer;
    sal_Int32   nNeeded;
    sal_Int32   cycles = len/3;
    sal_Int32   remain = len%3;
 
    if( remain == 0 )
        nNeeded = cycles*4;
    else
        nNeeded = (cycles+1)*4;
    buffer.reset(new char[nNeeded+1]);
 
    memset(buffer.get(), 0, nNeeded+1);
 
    for( sal_Int32 i=0; i<cycles; i++ )
        Encode_(buf+i*3,buffer.get()+i*4);
 
    sal_uInt8 last[3];
    if( remain == 1 )
    {
        last[0] = buf[len-1];
        last[1] = last[2] = 0;
        Encode_(last,buffer.get()+nNeeded+1-5);
    }
    else if( remain == 2 )
    {
        last[0] = buf[len-2];
        last[1] = buf[len-1];
        last[2] = 0;
        Encode_(last,buffer.get()+nNeeded+1-5);
    }
 
    OUString str = OUString::createFromAscii(buffer.get());
    return str;
}
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