/*
** Decode source from Base64 encoded string into raw data
**
** Returns: 0 - Success
** 1 - Error - Source underflow - need more base64 data
** 2 - Error - Chunk contains half a byte of data
** 3 - Error - Decoded results will overflow output buffer
*/
int decode(unsigned s_len, char *src, unsigned d_len, char *dst){
unsigned six, dix;
dix = 0;
for (six = 0; six < s_len; six += 4){
unsigned long sr;
unsigned ix;
sr = 0;
for (ix = 0; ix < 4; ++ix)
{
int sextet;
if (six+ix >= s_len)
return 1;
if ((sextet = tlu(*(src+six+ix))) < 0)
break;
sr <<= 6;
sr |= (sextet & 0x3f);
}
switch (ix){
case 0: /* end of data, no padding */
return 0;
case 1: /* can't happen */
return 2;
case 2: /* 1 result byte */
sr >>= 4;
if (dix > d_len) return 3;
*(dst+dix) = (sr & 0xff);
++dix;
break;
case 3: /* 2 result bytes */
sr >>= 2;
if (dix+1 > d_len) return 3;
*(dst+dix+1) = (sr & 0xff);
sr >>= 8;
*(dst+dix) = (sr & 0xff);
dix += 2;
break;
case 4: /* 3 result bytes */
if (dix+2 > d_len) return 3;
*(dst+dix+2) = (sr & 0xff);
sr >>= 8;
*(dst+dix+1) = (sr & 0xff);
sr >>= 8;
*(dst+dix) = (sr & 0xff);
dix += 3;
break;
}
}
return 0;
}
/*!
* This method converts rectangle widths and heights to device units while
* taking account rounding down errors.
* This fixes off-by-1-pixel-bugs in Rectangle widths and heights.
*/
UT_sint32 GR_Graphics::_tduR(UT_sint32 layoutUnits) const
{
UT_sint32 idh = tdu(layoutUnits);
if(tlu(idh) < layoutUnits)
{
idh += 1;
}
return idh;
}
