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Diffstat (limited to 'khexedit/conversion.cc')
| -rw-r--r-- | khexedit/conversion.cc | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/khexedit/conversion.cc b/khexedit/conversion.cc new file mode 100644 index 0000000..7a5c25c --- /dev/null +++ b/khexedit/conversion.cc @@ -0,0 +1,395 @@ +/* + * 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. + * + */ + +#include <string.h> + +#include <klocale.h> + +#include "conversion.h" + + +CConversion::CConversion( void ) +{ + setMode( cnvDefault ); +} + + +CConversion::EMode CConversion::mode( void ) +{ + return( (EMode)mState.mode ); +} + +const SEncodeState &CConversion::state( void ) +{ + return( mState ); +} + +QString CConversion::names( unsigned int index ) +{ + static const QString strings[4] = + { + i18n("Default encoding", "Default"), + i18n("EBCDIC"), + i18n("US-ASCII (7 bit)"), + i18n("Unknown"), + }; + + return( strings[ index > cnvUsAscii ? 3 : index ] ); +} + + +const unsigned char *CConversion::tables( EMode cnvMode ) +{ + /* + static unsigned char ebcdicToLatin1[256] = + { + 0x00, 0x01, 0x02, 0x03, 0x9C, 0x09, 0x86, 0x7F, + 0x97, 0x8D, 0x8E, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, + 0x10, 0x11, 0x12, 0x13, 0x9D, 0x85, 0x08, 0x87, + 0x18, 0x19, 0x92, 0x8F, 0x1C, 0x1D, 0x1E, 0x1F, + 0x80, 0x81, 0x82, 0x83, 0x84, 0x0A, 0x17, 0x1B, + 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x05, 0x06, 0x07, + 0x90, 0x91, 0x16, 0x93, 0x94, 0x95, 0x96, 0x04, + 0x98, 0x99, 0x9A, 0x9B, 0x14, 0x15, 0x9E, 0x1A, + 0x20, 0xA0, 0xE2, 0xE4, 0xE0, 0xE1, 0xE3, 0xE5, + 0xE7, 0xF1, 0xA2, 0x2E, 0x3C, 0x28, 0x2B, 0x7C, + 0x26, 0xE9, 0xEA, 0xEB, 0xE8, 0xED, 0xEE, 0xEF, + 0xEC, 0xDF, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0x5E, + 0x2D, 0x2F, 0xC2, 0xC4, 0xC0, 0xC1, 0xC3, 0xC5, + 0xC7, 0xD1, 0xA6, 0x2C, 0x25, 0x5F, 0x3E, 0x3F, + 0xF8, 0xC9, 0xCA, 0xCB, 0xC8, 0xCD, 0xCE, 0xCF, + 0xCC, 0x60, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22, + 0xD8, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, + 0x68, 0x69, 0xAB, 0xBB, 0xF0, 0xFD, 0xFE, 0xB1, + 0xB0, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, + 0x71, 0x72, 0xAA, 0xBA, 0xE6, 0xB8, 0xC6, 0xA4, + 0xB5, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, + 0x79, 0x7A, 0xA1, 0xBF, 0xD0, 0x5B, 0xDE, 0xAE, + 0xAC, 0xA3, 0xA5, 0xB7, 0xA9, 0xA7, 0xB6, 0xBC, + 0xBD, 0xBE, 0xDD, 0xA8, 0xAF, 0x5D, 0xB4, 0xD7, + 0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, + 0x48, 0x49, 0xAD, 0xF4, 0xF6, 0xF2, 0xF3, 0xF5, + 0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, + 0x51, 0x52, 0xB9, 0xFB, 0xFC, 0xF9, 0xFA, 0xFF, + 0x5C, 0xF7, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, + 0x59, 0x5A, 0xB2, 0xD4, 0xD6, 0xD2, 0xD3, 0xD5, + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, + 0x38, 0x39, 0xB3, 0xDB, 0xDC, 0xD9, 0xDA, 0x9F + }; + */ + + static unsigned char ebcdicToLatin1[256] = + { + 0x00, 0x01, 0x02, 0x03, 0x9C, 0x09, 0x86, 0x7F, + 0x97, 0x8D, 0x8E, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, + 0x10, 0x11, 0x12, 0x13, 0x9D, 0x85, 0x08, 0x87, + 0x18, 0x19, 0x92, 0x8F, 0x1C, 0x1D, 0x1E, 0x1F, + 0x80, 0x81, 0x82, 0x83, 0x84, 0x0A, 0x17, 0x1B, + 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x05, 0x06, 0x07, + 0x90, 0x91, 0x16, 0x93, 0x94, 0x95, 0x96, 0x04, + 0x98, 0x99, 0x9A, 0x9B, 0x14, 0x15, 0x9E, 0x1A, + 0x20, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, + 0xA7, 0xA8, 0x5B, 0x2E, 0x3C, 0x28, 0x2B, 0x21, + 0x26, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, + 0xB0, 0xB1, 0x5D, 0x24, 0x2A, 0x29, 0x3B, 0x5E, + 0x2D, 0x2F, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, + 0xB8, 0xB9, 0x7C, 0x2C, 0x25, 0x5F, 0x3E, 0x3F, + 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF, 0xC0, 0xC1, + 0xC2, 0x60, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22, + 0xC3, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, + 0x68, 0x69, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, + 0xCA, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, + 0x71, 0x72, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, + 0xD1, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, + 0x79, 0x7A, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, + 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, + 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, + 0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, + 0x48, 0x49, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, + 0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, + 0x51, 0x52, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, + 0x5C, 0x9F, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, + 0x59, 0x5A, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, + 0x38, 0x39, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF, + }; + + static unsigned char buf[256]; + + + if( cnvMode == cnvEbcdic ) + { + return( ebcdicToLatin1 ); + } + else if( cnvMode == cnvUsAscii ) + { + memset( buf, 0, 256 ); + for( unsigned int i=0; i<127; i++ ) { buf[i] = i; } + return( buf ); + } + else if( cnvMode == cnvDefault ) + { + for( unsigned int i=0; i<256; i++ ) { buf[i] = i; } + return( buf ); + } + else + { + return( 0 ); + } +} + + +void CConversion::setMode( EMode cnvMode ) +{ + const unsigned char *table = tables( cnvMode ); + if( table == 0 ) + { + cnvMode = cnvDefault; + table = tables( cnvMode ); + } + + mState.mode = cnvMode; + mState.name = names( mState.mode ); + memcpy( mData, table, 256 ); +} + + +bool CConversion::lossless( EMode cnvMode ) +{ + const unsigned char *table = tables( cnvMode ); + if( table == 0 ) + { + return( false ); + } + + unsigned char flag[256]; + memset( flag, 0, sizeof( flag ) ); + + for( uint i=0; i<256; i++ ) + { + int index = table[i]; + if( flag[index] != 0 ) + { + return( false ); + } + flag[index] += 1; + } + + return( true ); +} + + + +#if 0 +void CConversion::setMode( EMode cnvMode ) +{ + /* + static unsigned char ebcdicToLatin1[256] = + { + 0x00, 0x01, 0x02, 0x03, 0x9C, 0x09, 0x86, 0x7F, + 0x97, 0x8D, 0x8E, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, + 0x10, 0x11, 0x12, 0x13, 0x9D, 0x85, 0x08, 0x87, + 0x18, 0x19, 0x92, 0x8F, 0x1C, 0x1D, 0x1E, 0x1F, + 0x80, 0x81, 0x82, 0x83, 0x84, 0x0A, 0x17, 0x1B, + 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x05, 0x06, 0x07, + 0x90, 0x91, 0x16, 0x93, 0x94, 0x95, 0x96, 0x04, + 0x98, 0x99, 0x9A, 0x9B, 0x14, 0x15, 0x9E, 0x1A, + 0x20, 0xA0, 0xE2, 0xE4, 0xE0, 0xE1, 0xE3, 0xE5, + 0xE7, 0xF1, 0xA2, 0x2E, 0x3C, 0x28, 0x2B, 0x7C, + 0x26, 0xE9, 0xEA, 0xEB, 0xE8, 0xED, 0xEE, 0xEF, + 0xEC, 0xDF, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0x5E, + 0x2D, 0x2F, 0xC2, 0xC4, 0xC0, 0xC1, 0xC3, 0xC5, + 0xC7, 0xD1, 0xA6, 0x2C, 0x25, 0x5F, 0x3E, 0x3F, + 0xF8, 0xC9, 0xCA, 0xCB, 0xC8, 0xCD, 0xCE, 0xCF, + 0xCC, 0x60, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22, + 0xD8, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, + 0x68, 0x69, 0xAB, 0xBB, 0xF0, 0xFD, 0xFE, 0xB1, + 0xB0, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, + 0x71, 0x72, 0xAA, 0xBA, 0xE6, 0xB8, 0xC6, 0xA4, + 0xB5, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, + 0x79, 0x7A, 0xA1, 0xBF, 0xD0, 0x5B, 0xDE, 0xAE, + 0xAC, 0xA3, 0xA5, 0xB7, 0xA9, 0xA7, 0xB6, 0xBC, + 0xBD, 0xBE, 0xDD, 0xA8, 0xAF, 0x5D, 0xB4, 0xD7, + 0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, + 0x48, 0x49, 0xAD, 0xF4, 0xF6, 0xF2, 0xF3, 0xF5, + 0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, + 0x51, 0x52, 0xB9, 0xFB, 0xFC, 0xF9, 0xFA, 0xFF, + 0x5C, 0xF7, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, + 0x59, 0x5A, 0xB2, 0xD4, 0xD6, 0xD2, 0xD3, 0xD5, + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, + 0x38, 0x39, 0xB3, 0xDB, 0xDC, 0xD9, 0xDA, 0x9F + }; + */ + + static unsigned char ebcdicToLatin1[256] = + { + 0x00, 0x01, 0x02, 0x03, 0x9C, 0x09, 0x86, 0x7F, + 0x97, 0x8D, 0x8E, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, + 0x10, 0x11, 0x12, 0x13, 0x9D, 0x85, 0x08, 0x87, + 0x18, 0x19, 0x92, 0x8F, 0x1C, 0x1D, 0x1E, 0x1F, + 0x80, 0x81, 0x82, 0x83, 0x84, 0x0A, 0x17, 0x1B, + 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x05, 0x06, 0x07, + 0x90, 0x91, 0x16, 0x93, 0x94, 0x95, 0x96, 0x04, + 0x98, 0x99, 0x9A, 0x9B, 0x14, 0x15, 0x9E, 0x1A, + 0x20, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, + 0xA7, 0xA8, 0x5B, 0x2E, 0x3C, 0x28, 0x2B, 0x21, + 0x26, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, + 0xB0, 0xB1, 0x5D, 0x24, 0x2A, 0x29, 0x3B, 0x5E, + 0x2D, 0x2F, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, + 0xB8, 0xB9, 0x7C, 0x2C, 0x25, 0x5F, 0x3E, 0x3F, + 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF, 0xC0, 0xC1, + 0xC2, 0x60, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22, + 0xC3, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, + 0x68, 0x69, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, + 0xCA, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, + 0x71, 0x72, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, + 0xD1, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, + 0x79, 0x7A, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, + 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, + 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, + 0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, + 0x48, 0x49, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, + 0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, + 0x51, 0x52, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, + 0x5C, 0x9F, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, + 0x59, 0x5A, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, + 0x38, 0x39, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF, + }; + + + if( cnvMode == cnvEbcdic ) + { + memcpy( mData, ebcdicToLatin1, 256 ); + } + else if( cnvMode == cnvUsAscii ) + { + memset( mData, 0, 256 ); + for( unsigned int i=0; i<127; i++ ) { mData[i] = i; } + } + else + { + for( unsigned int i=0; i<256; i++ ) { mData[i] = i; } + cnvMode = cnvDefault; + } + + mState.mode = cnvMode; + mState.name = names( mState.mode ); +} +#endif + + + + +int CConversion::convert( QByteArray &buf, EMode newMode, CProgress &p ) +{ + if( newMode == mode() ) + { + p.finish(); + return( Err_Success ); + } + + if( buf.isEmpty() ) + { + p.finish(); + setMode( newMode ); + return( Err_Success ); + } + + // + // Make backup + // + const QByteArray tmp( buf.copy() ); + if( tmp.isEmpty() ) + { + p.finish(); + return( Err_NoMemory ); + } + + unsigned char rev[256]; + uint i, sum; + + sum = 0; + + const float total = buf.size() * 2.0; + + // + // Prepare reverse buffer. + // + for( i=0; i < 256; i++ ) + { + rev[(unsigned char)mData[i]] = i; + } + + // + // Normalize + // + for( i=0; i<buf.size(); i++, sum++ ) + { + buf[i] = rev[ (unsigned char)buf[i] ]; + + // + // The expired() function introduces too much overhead in this case + // so it is only executed every 100'th character + // + if( i % 100 == 0 && p.expired() == true ) + { + const int errCode = p.step( (float)sum/ total ); + if( errCode == Err_Stop ) + { + buf = tmp; + p.finish(); + return( Err_OperationAborted ); + } + } + } + + EMode origMode = mode(); + setMode( newMode ); + + // + // Apply new encoding. + // + for( uint i=0; i<buf.size(); i++, sum++ ) + { + buf[i] = mData[ (unsigned char)buf[i] ]; + + // + // The expired() function introduces too much overhead in this case + // so it is only executed every 100'th character + // + if( i % 100 == 0 && p.expired() == true ) + { + const int errCode = p.step( (float)sum/ total ); + if( errCode == Err_Stop ) + { + buf = tmp; + setMode( origMode ); + p.finish(); + return( Err_OperationAborted ); + } + } + } + + p.finish(); + return( Err_Success ); +} + + |