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/*
* Copyright (C) 2007-2012 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#include "bu/base64.h"
namespace Bu { subExceptionDef( Base64Exception ) }
const char Bu::Base64::tblEnc[65] = {
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
};
Bu::Base64::Base64( Bu::Stream &rNext, int iChunkSize ) :
Bu::Filter( rNext ),
iBPos( 0 ),
iBuf( 0 ),
iRPos( 0 ),
iChars( 0 ),
bEosIn( false ),
iTotalIn( 0 ),
iTotalOut( 0 ),
eMode( Nothing ),
iChunkSize( iChunkSize ),
iCurChunk( 0 )
{
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()
{
iCurChunk = 0;
}
Bu::size Bu::Base64::stop()
{
if( eMode == Encode )
{
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] = '=';
}
iCurChunk += 4;
if( iChunkSize && iCurChunk >= iChunkSize )
{
iCurChunk = iCurChunk-iChunkSize;
iTotalOut += rNext.write( outBuf, 4-iCurChunk );
iTotalOut += rNext.write("\r\n", 2 );
iTotalOut += rNext.write( outBuf+(4-iCurChunk), iCurChunk );
}
else
iTotalOut += rNext.write( outBuf, 4 );
return iTotalOut;
}
else
{
return iTotalIn;
}
}
Bu::size Bu::Base64::read( void *pBuf, Bu::size nBytes )
{
if( eMode == Encode )
throw Bu::Base64Exception("Cannot read from an output stream.");
eMode = Decode;
if( bEosIn == true && iRPos == iChars )
return 0;
Bu::size sIn = 0;
char buf[4];
while( sIn < nBytes )
{
for(; iRPos < iChars && sIn < nBytes; iRPos++, sIn++ )
{
((unsigned char *)pBuf)[sIn] = (iBuf>>(8*(2-iRPos)))&0xFF;
}
if( iRPos == iChars )
{
if( bEosIn == true )
return sIn;
else
iRPos = 0;
}
else if( sIn == nBytes )
return sIn;
//if( rNext.read( buf, 4 ) == 0 )
// return sIn;
for( int j = 0; j < 4; j++ )
{
if( rNext.read( &buf[j], 1 ) == 0 )
{
if( rNext.isEos() )
{
if( iRPos == 0 )
iRPos = iChars;
bEosIn = true;
if( j != 0 )
{
throw Base64Exception(
"Premature end of stream detected while "
"decoding Base64 data."
);
}
}
return sIn;
}
if( buf[j] == ' ' || buf[j] == '\t' ||
buf[j] == '\n' || buf[j] == '\r' )
{
j--;
}
}
iChars = 3;
iBuf = 0;
for( int j = 0; j < 4; j++ )
{
if( buf[j] == '=' )
{
iChars--;
bEosIn = true;
}
else
iBuf |= (tblDec[buf[j]-'+']&0x3f)<<((3-j)*6);
//printf("%d: %06X (%02X)\n", j, iBuf, (tblDec[buf[j]-'+']&0x3f) );
}
}
return sIn;
}
Bu::size Bu::Base64::write( const void *pBuf, Bu::size nBytes )
{
if( eMode == Decode )
throw Bu::Base64Exception("Cannot write to an input stream.");
eMode = Encode;
Bu::size sOut = 0;
char outBuf[4];
for( Bu::size 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];
}
iCurChunk += 4;
if( iChunkSize && iCurChunk >= iChunkSize )
{
iCurChunk = iCurChunk-iChunkSize;
sOut += rNext.write( outBuf, 4-iCurChunk );
sOut += rNext.write("\r\n", 2 );
sOut += rNext.write( outBuf+(4-iCurChunk), iCurChunk );
}
else
sOut += rNext.write( outBuf, 4 );
iBPos = iBuf = 0;
}
}
iTotalOut += sOut;
return sOut;
}
bool Bu::Base64::isOpen()
{
return true;
}
bool Bu::Base64::isEos()
{
if( bEosIn == true && iRPos == iChars )
return true;
return false;
}
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