KSG-Framework/Schluessel.cpp

#include "Schluessel.h"

using namespace Framework::Verschlüsselung;

// Inhalt der Bytes Klasse aus Schlüssel.h
// Konstruktor
Bytes::Bytes()
    : bytes( 0 ),
    del( 1 ),
    län( 0 ),
    ref( 1 )
{}

Bytes::Bytes( int län )
    : bytes( new char[ län ] ),
    del( 1 ),
    län( län ),
    ref( 1 )
{}

Bytes::Bytes( const char *daten, int län )
    : bytes( new char[ län ] ),
    del( 1 ),
    län( län ),
    ref( 1 )
{
    setBytes( daten );
}

// Destruktor
Bytes::~Bytes()
{
    if( del )
        delete[] bytes;
}

// nicht constant
void Bytes::setBytes( const char *daten )
{
    if( !bytes || !daten )
        return;
    char *end = bytes + län;
    for( char *c = bytes; c < end; c++, ++daten )
        *c = *daten;
}

void Bytes::setBytes( const char *daten, int län )
{
    if( !daten || !län )
        return;
    if( del )
        delete[] bytes;
    del = 1;
    bytes = new char[ län ];
    this->län = län;
    setBytes( daten );
}

void Bytes::setBytesZ( char *daten, int län )
{
    if( del )
        delete[] bytes;
    del = 0;
    bytes = daten;
    this->län = län;
}

void Bytes::füll( const char c )
{
    if( !bytes )
        return;
    char *end = bytes + län;
    for( char *b = bytes; b < end; ++b )
        *b = c;
}

void Bytes::füll( const char c, int län )
{
    if( !bytes )
        bytes = new char[ län ];
    län = län > this->län ? this->län : län;
    char *end = bytes + län;
    for( char *b = bytes; b < end; ++b )
        *b = c;
}

void Bytes::füll( const char c, int beg, int end )
{
    if( beg >= län )
        return;
    if( !bytes )
        bytes = new char[ end - beg ];
    end = end > this->län ? this->län : end;
    char *endB = bytes + end;
    for( char *b = bytes + beg; b < endB; ++b )
        *b = c;
}

void Bytes::füll( const char *c, int cLän )
{
    if( !c || !cLän || !bytes )
        return;
    char *endB = bytes + län;
    const char *endC = c + cLän;
    const char *d = c;
    for( char *b = bytes; b < endB; b++, d = d < endC - 1 ? d + 1 : c )
        *b = *d;
}

void Bytes::set( const char c, int pos )
{
    if( !bytes || pos >= län )
        return;
    bytes[ pos ] = c;
}

// constant
int Bytes::getLänge() const
{
    return län;
}

char *Bytes::getBytes() const
{
    return bytes;
}

// Reference Counting
Bytes *Bytes::getThis()
{
    ++ref;
    return this;
}

Bytes *Bytes::release()
{
    --ref;
    if( !ref )
        delete this;
    return 0;
}


// Inhalt der Schlüssel Klasse aus Schlüssel.h
// Konstruktor
Schlüssel::Schlüssel()
    : schlüssel( 0 ),
    län( 0 ),
    pos( 0 ),
    ref( 1 )
{}

Schlüssel::Schlüssel( const char *s, int län )
    : schlüssel( new unsigned char[ län ] ),
    län( län ),
    pos( 0 ),
    ref( 1 )
{
    for( int i = 0; i < län; ++i )
        schlüssel[ i ] = s[ i ];
}

// Destruktor
Schlüssel::~Schlüssel()
{
    delete[] schlüssel;
}

// nicht constant
void Schlüssel::setPos( int p )
{
    if( p < 0 )
        p = 0;
    pos = p > län ? 0 : p;
}

void Schlüssel::setSchlüssel( const char *s, int län )
{
    delete[] schlüssel;
    schlüssel = new unsigned char[ län ];
    for( int i = 0; i < län; ++i )
        schlüssel[ i ] = s[ i ];
    pos = 0;
    this->län = län;
}

void Schlüssel::codieren( Bytes *daten )
{
    if( !schlüssel || !län )
    {
        daten->release();
        return;
    }
    int dLän = daten->getLänge();
    char *bytes = daten->getBytes();
    char *bEnd = bytes + dLän;
    for( char *c = bytes; c < bEnd; ++c )
    {
        *c = *c + schlüssel[ pos ];
        ++pos;
        if( pos >= län )
            pos = 0;
    }
    daten->release();
}

void Schlüssel::decodieren( Bytes *daten )
{
    if( !schlüssel || !län )
    {
        daten->release();
        return;
    }
    int dLän = daten->getLänge();
    char *bytes = daten->getBytes();
    char *bEnd = bytes + dLän;
    for( char *c = bytes; c < bEnd; ++c )
    {
        *c = *c - schlüssel[ pos ];
        ++pos;
        if( pos >= län )
            pos = 0;
    }
    daten->release();
}

// Reference Counting
Schlüssel *Schlüssel::getThis()
{
    ++ref;
    return this;
}

Schlüssel *Schlüssel::release()
{
    --ref;
    if( !ref )
        delete this;
    return 0;
}