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tdeutils/khexedit/hexclipboard.cc

255 lines
5.2 KiB

/*
* khexedit - Versatile hex editor
* Copyright (C) 1999 Espen Sand, espensa@online.no
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
//
// This is a VERY crude implementation, which serves my requirements and
// nothing more.
//
#include <string.h>
#include "hexclipboard.h"
static const uchar *base64EncodeTable( void )
{
static uchar table[64] =
{
'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','+','/',
};
return( table );
}
static const uchar *base64DecodeTable( void )
{
static uchar table[255];
static bool init = false;
if( init == false )
{
uint i;
for( i = 0; i < 255; i++ ) { table[i] = 0x80; }
for( i = 'A'; i <= 'Z'; i++ ) { table[i] = 0 + (i - 'A'); }
for( i = 'a'; i <= 'z'; i++ ) { table[i] = 26 + (i - 'a'); }
for( i = '0'; i <= '9'; i++ ) { table[i] = 52 + (i - '0'); }
table[(uchar)'+'] = 62;
table[(uchar)'/'] = 63;
table[(uchar)'='] = 0;
init = true;
}
return( table );
}
static const char *mimeHeader( void )
{
static const char *data =
"Content-Type: application/octet-stream; " \
"name=\"khexedit_copy\"\r\n" \
"Content-Transfer-Encoding: base64\r\n\r\n";
return( data );
}
CHexClipboard::CHexClipboard( void )
{
}
CHexClipboard::~CHexClipboard( void )
{
}
bool CHexClipboard::encode( QByteArray &dst, QByteArray &src )
{
if( src.size() == 0 )
{
return( false );
}
uint srcSize = src.size();
uint mimeSize = strlen( mimeHeader() );
uint lineSize = 72;
uint dstSize = (srcSize / 3 + (srcSize % 3 ? 1 : 0)) * 4;
dstSize += ((dstSize/lineSize) + 1)*2 + 1;
dst.resize( dstSize + mimeSize + 1 );
if( dst.isNull() == true )
{
return( false );
}
unsigned char inBuf[3], outBuf[4];
uint lineLen = 0;
memcpy( dst.data(), mimeHeader(), mimeSize );
uint j = mimeSize;
const uchar *table = base64EncodeTable();
for( uint i=0; i < srcSize; i += 3 )
{
memset( inBuf, 0, sizeof(inBuf) );
uint n;
for( n=0; n < 3; n++ )
{
if( i+n >= srcSize )
{
break;
}
inBuf[n] = src[i+n];
}
if( n > 0 )
{
outBuf[0] = table[ inBuf[0] >> 2 ];
outBuf[1] = table[ ((inBuf[0] & 0x3) << 4) | (inBuf[1] >> 4) ];
outBuf[2] = table[ ((inBuf[1] & 0xF) << 2) | (inBuf[2] >> 6) ];
outBuf[3] = table[ inBuf[2] & 0x3F ];
if( n < 3 )
{
outBuf[3] = '=';
if( n < 2 )
{
outBuf[2] = '=';
}
}
for( uint m=0; m<4; m++ )
{
if( lineLen >= lineSize )
{
dst[j++] = '\r';
dst[j++] = '\n';
lineLen = 0;
}
dst[j++] = outBuf[m];
lineLen += 1;
}
}
}
dst[j++] = '\r';
dst[j++] = '\n';
dst[j++] = '\0';
return( true );
}
bool CHexClipboard::decode( QByteArray &dst, QString &src )
{
uint mimeSize = strlen( mimeHeader() );
if( src.length() <= mimeSize )
{
return( plainDecode( dst, src ) );
}
if( memcmp( src.ascii(), mimeHeader(), mimeSize ) != 0 )
{
return( plainDecode( dst, src ) );
}
uint srcSize = src.length();
uint dstSize = (srcSize * 3) / 4;
uchar srcBuf[4], valBuf[4], dstBuf[3];
uint sumElement = 0;
dst.resize( dstSize );
if( dst.isNull() == true )
{
return( plainDecode( dst, src ) );
}
uint i,j;
uint n = 0;
const uchar *table = base64DecodeTable();
for( i=mimeSize; i<srcSize; )
{
for( j=0; j<4; )
{
if( i >= srcSize )
{
dst.truncate( sumElement );
return( j > 0 ? false : true );
}
int c = src[i++].latin1();
if( c <= ' ' )
{
continue;
}
if( table[c] & 0x80 )
{
return( plainDecode( dst, src ) );
}
srcBuf[j] = c;
valBuf[j] = table[c];
j++;
}
dstBuf[0] = (valBuf[0] << 2) | (valBuf[1] >> 4);
dstBuf[1] = (valBuf[1] << 4) | (valBuf[2] >> 2);
dstBuf[2] = (valBuf[2] << 6) | (valBuf[3]);
uint numElement = srcBuf[2] == '=' ? 1 : (srcBuf[3] == '=' ? 2 : 3);
for( uint m=0; m < numElement; m++ )
{
dst[n++] = dstBuf[m];
}
sumElement += numElement;
if( numElement < 3 )
{
break;
}
}
dst.truncate( sumElement );
return( true );
}
bool CHexClipboard::plainDecode( QByteArray &dst, QString &src )
{
dst.resize( src.length() );
if( dst.isNull() == true )
{
return( false );
}
for( uint i=0; i < src.length(); dst[i] = src[i].latin1(), i++ );
return( true );
}