diff options
Diffstat (limited to 'khexedit/hexclipboard.cc')
| -rw-r--r-- | khexedit/hexclipboard.cc | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/khexedit/hexclipboard.cc b/khexedit/hexclipboard.cc new file mode 100644 index 0000000..0de70d6 --- /dev/null +++ b/khexedit/hexclipboard.cc @@ -0,0 +1,254 @@ +/* + * 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 ); +} + |