windows-server-2003/shell/ext/mlang/detckrn.cpp

// =================================================================================
// Internet Character Set Detection: For Korean
// =================================================================================

#include "private.h"
#include "detcbase.h"
#include "detckrn.h"
#include "fechrcnv.h"
#include "codepage.h"

CIncdKorean::CIncdKorean()
{
    m_nEscMode = NO_ESC ;
    m_bFindDesigator = FALSE ;
    m_nCharCount = 0 ;
}

BOOL CIncdKorean::DetectChar(UCHAR tc)
{
    switch ( tc ) 
    {
        case ESC:
            if ( m_nEscMode == NO_ESC )
                m_nEscMode = sESC ;
            else
                m_nEscMode = NO_ESC ;
            break;
        case ISO2022_IN_CHAR :      //  '$'
            if ( m_nEscMode == sESC )
                m_nEscMode = sESC_1 ;
            else
                m_nEscMode = NO_ESC ;
            break;
        case ISO2022_IN_KR_CHAR_1 : //  ')'
            if ( m_nEscMode == sESC_1 )
                m_nEscMode = sESC_2 ;
            else
                m_nEscMode = NO_ESC ;
            break;
        case ISO2022_IN_KR_CHAR_2 : //  'C'
            if ( m_nEscMode == sESC_2 )
            {
                m_bFindDesigator = TRUE ;
                return TRUE ;
            }
            break;
        default:
            m_nEscMode = NO_ESC ;
            break;
    }

    // only look ahead a max 1024 char
    if ( ++m_nCharCount > 1024 )
        return TRUE;

    return FALSE;
}

int CIncdKorean::GetDetectedCodeSet()
{
    if ( m_bFindDesigator )
        return CP_ISO_2022_KR ; // ISO
    else
        return CP_KOR_5601 ; // Korean Windows 
}