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#include "bu/base64.h"
const char Bu::Base64::tblEnc[65] = {
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
};
Bu::Base64::Base64( Bu::Stream &rNext, Mode eMode ) :
Bu::Filter( rNext ),
iBPos( 0 ),
iBuf( 0 ),
iTotalIn( 0 ),
iTotalOut( 0 ),
eMode( eMode )
{
start();
memset( tblDec, 0, 80 );
for( int j = 0; j < 64; j++ )
{
tblDec[tblEnc[j]-'+'] = j;
// printf("'%c' = %d\n", tblEnc[j], j );
}
/*
for( int j = 0; j < 64; j++ )
{
printf("'%c' = '%c' (%d = %d)\n",
tblEnc[j], tblEnc[tblDec[tblEnc[j]-'+']],
j, tblDec[tblEnc[j]-'+'] );
}*/
// The following is used to compute the table size for the decoding table.
/*
char low='A', high='A';
for( int j = 0; j < 64; j++ )
{
if( tblEnc[j] < low )
low = tblEnc[j];
if( tblEnc[j] > high )
high = tblEnc[j];
}
printf("'%c' - '%c' (%d - %d) (%d)\n", low, high, low, high, high-low );
*/
}
Bu::Base64::~Base64()
{
stop();
}
void Bu::Base64::start()
{
}
size_t Bu::Base64::stop()
{
if( eMode == Write )
{
char outBuf[4];
int iBUsed = 4-(3-iBPos);
if( iBPos == 0 )
return iTotalOut;
for( int k = 0; k < 4; k++ )
{
outBuf[3-k] = tblEnc[(iBuf>>(6*k))&0x3f];
}
for( int k = iBUsed; k < 4; k++ )
{
outBuf[k] = '=';
}
iTotalOut += rNext.write( outBuf, 4 );
return iTotalOut;
}
else
{
return iTotalIn;
}
}
size_t Bu::Base64::read( void *pBuf, size_t nBytes )
{
size_t sIn = 0;
char buf[4];
while( sIn < nBytes )
{
if( rNext.read( buf, 4 ) == 0 )
return sIn;
int iChars = 3;
for( int j = 0; j < 4; j++ )
{
if( buf[j] == '=' )
iChars--;
else
iBuf |= (tblDec[buf[j]-'+']&0x3f)<<((3-j)*6);
printf("%d: %06X (%02X)\n", j, iBuf, (tblDec[buf[j]-'+']&0x3f) );
}
for( int j = 0; j < iChars; j++ )
{
((unsigned char *)pBuf)[sIn++] = (iBuf>>(8*(2-j)))&0xFF;
}
iBuf = 0;
}
return sIn;
}
size_t Bu::Base64::write( const void *pBuf, size_t nBytes )
{
size_t sOut = 0;
char outBuf[4];
for( size_t j = 0; j < nBytes; j++ )
{
iBuf |= (((uint8_t *)pBuf)[j])<<((2-iBPos++)*8);
if( iBPos == 3 )
{
for( int k = 0; k < 4; k++ )
{
outBuf[3-k] = tblEnc[(iBuf>>(6*k))&0x3f];
}
sOut += rNext.write( outBuf, 4 );
iBPos = iBuf = 0;
}
}
iTotalOut += sOut;
return sOut;
}
bool Bu::Base64::isOpen()
{
return true;
}
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