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encconv.cpp
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C/C++ Source or Header
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2002-01-25
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/////////////////////////////////////////////////////////////////////////////
// Name: encconv.cpp
// Purpose: wxEncodingConverter class for converting between different
// font encodings
// Author: Vaclav Slavik
// Copyright: (c) 1999 Vaclav Slavik
// Licence: wxWindows Licence
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#pragma implementation "encconv.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#if wxUSE_FONTMAP
#include "wx/encconv.h"
#include <stdlib.h>
// conversion tables, generated by scripts in $(WXWIN)/misc/unictabl:
#ifdef __BORLANDC__
#include "../common/unictabl.inc"
#else
#include "unictabl.inc"
#endif
#if wxUSE_WCHAR_T
typedef wchar_t tchar;
#else
typedef char tchar;
#endif
static wxUint16* LINKAGEMODE GetEncTable(wxFontEncoding enc)
{
for (int i = 0; encodings_list[i].table != NULL; i++)
{
if (encodings_list[i].encoding == enc)
return encodings_list[i].table;
}
return NULL;
}
typedef struct {
wxUint16 u;
wxUint8 c;
} CharsetItem;
extern "C" int LINKAGEMODE CompareCharsetItems(const void *i1, const void *i2)
{
return ( ((CharsetItem*)i1) -> u - ((CharsetItem*)i2) -> u );
}
static CharsetItem* LINKAGEMODE BuildReverseTable(wxUint16 *tbl)
{
CharsetItem *rev = new CharsetItem[128];
for (int i = 0; i < 128; i++)
rev[i].c = 128 + i, rev[i].u = tbl[i];
qsort(rev, 128, sizeof(CharsetItem), CompareCharsetItems);
return rev;
}
wxEncodingConverter::wxEncodingConverter()
{
m_Table = NULL;
m_UnicodeInput = m_UnicodeOutput = FALSE;
m_JustCopy = FALSE;
}
bool wxEncodingConverter::Init(wxFontEncoding input_enc, wxFontEncoding output_enc, int method)
{
unsigned i;
wxUint16 *in_tbl = NULL, *out_tbl = NULL;
if (m_Table) {delete[] m_Table; m_Table = NULL;}
#if !wxUSE_WCHAR_T
if (input_enc == wxFONTENCODING_UNICODE || output_enc == wxFONTENCODING_UNICODE) return FALSE;
#endif
if (input_enc == output_enc) {m_JustCopy = TRUE; return TRUE;}
m_UnicodeOutput = (output_enc == wxFONTENCODING_UNICODE);
m_JustCopy = FALSE;
if (input_enc == wxFONTENCODING_UNICODE)
{
if ((out_tbl = GetEncTable(output_enc)) == NULL) return FALSE;
m_Table = new tchar[65536];
for (i = 0; i < 128; i++) m_Table[i] = (tchar)i; // 7bit ASCII
for (i = 128; i < 65536; i++) m_Table[i] = (tchar)'?';
// FIXME - this should be character that means `unicode to charset' impossible, not '?'
if (method == wxCONVERT_SUBSTITUTE)
{
for (i = 0; i < encoding_unicode_fallback_count; i++)
m_Table[encoding_unicode_fallback[i].c] = (tchar) encoding_unicode_fallback[i].s;
}
for (i = 0; i < 128; i++)
m_Table[out_tbl[i]] = (tchar)(128 + i);
m_UnicodeInput = TRUE;
return TRUE;
}
else
{
if ((in_tbl = GetEncTable(input_enc)) == NULL) return FALSE;
if (output_enc != wxFONTENCODING_UNICODE)
if ((out_tbl = GetEncTable(output_enc)) == NULL) return FALSE;
m_UnicodeInput = FALSE;
m_Table = new tchar[256];
for (i = 0; i < 128; i++) m_Table[i] = (tchar)i; // 7bit ASCII
if (output_enc == wxFONTENCODING_UNICODE)
{
for (i = 0; i < 128; i++) m_Table[128 + i] = (tchar)in_tbl[i];
return TRUE;
}
else
{
CharsetItem *rev = BuildReverseTable(out_tbl);
CharsetItem *item;
CharsetItem key;
for (i = 0; i < 128; i++)
{
key.u = in_tbl[i];
item = (CharsetItem*) bsearch(&key, rev, 128, sizeof(CharsetItem), CompareCharsetItems);
if (item == NULL && method == wxCONVERT_SUBSTITUTE)
item = (CharsetItem*) bsearch(&key, encoding_unicode_fallback,
encoding_unicode_fallback_count, sizeof(CharsetItem), CompareCharsetItems);
if (item)
m_Table[128 + i] = (tchar)item -> c;
else
#if wxUSE_WCHAR_T
m_Table[128 + i] = (wchar_t)(128 + i);
#else
m_Table[128 + i] = (char)(128 + i);
#endif
}
delete[] rev;
return TRUE;
}
}
}
void wxEncodingConverter::Convert(const char* input, char* output)
{
wxASSERT_MSG(!m_UnicodeOutput, wxT("You cannot convert to unicode if output is const char*!"));
wxASSERT_MSG(!m_UnicodeInput, wxT("You cannot convert from unicode if input is const char*!"));
const char *i;
char *o;
if (m_JustCopy)
{
strcpy(output, input);
return;
}
wxCHECK_RET(m_Table != NULL, wxT("You must call wxEncodingConverter::Init() before actually converting!"));
for (i = input, o = output; *i != 0;)
*(o++) = (char)(m_Table[(wxUint8)*(i++)]);
*o = 0;
}
#if wxUSE_WCHAR_T
void wxEncodingConverter::Convert(const char* input, wchar_t* output)
{
wxASSERT_MSG(m_UnicodeOutput, wxT("You cannot convert to 8-bit if output is const wchar_t*!"));
wxASSERT_MSG(!m_UnicodeInput, wxT("You cannot convert from unicode if input is const char*!"));
const char *i;
wchar_t *o;
if (m_JustCopy)
{
for (i = input, o = output; *i != 0;)
*(o++) = (wchar_t)(*(i++));
*o = 0;
return;
}
wxCHECK_RET(m_Table != NULL, wxT("You must call wxEncodingConverter::Init() before actually converting!"));
for (i = input, o = output; *i != 0;)
*(o++) = (wchar_t)(m_Table[(wxUint8)*(i++)]);
*o = 0;
}
void wxEncodingConverter::Convert(const wchar_t* input, char* output)
{
wxASSERT_MSG(!m_UnicodeOutput, wxT("You cannot convert to unicode if output is const char*!"));
wxASSERT_MSG(m_UnicodeInput, wxT("You cannot convert from 8-bit if input is const wchar_t*!"));
const wchar_t *i;
char *o;
if (m_JustCopy)
{
for (i = input, o = output; *i != 0;)
*(o++) = (char)(*(i++));
*o = 0;
return;
}
wxCHECK_RET(m_Table != NULL, wxT("You must call wxEncodingConverter::Init() before actually converting!"));
for (i = input, o = output; *i != 0;)
*(o++) = (char)(m_Table[(wxUint16)*(i++)]);
*o = 0;
}
void wxEncodingConverter::Convert(const wchar_t* input, wchar_t* output)
{
wxASSERT_MSG(m_UnicodeOutput, wxT("You cannot convert to 8-bit if output is const wchar_t*!"));
wxASSERT_MSG(m_UnicodeInput, wxT("You cannot convert from 8-bit if input is const wchar_t*!"));
const wchar_t *i;
wchar_t *o;
if (m_JustCopy)
{
// wcscpy() is not guaranteed to exist
for (i = input, o = output; *i != 0;)
*(o++) = (*(i++));
*o = 0;
return;
}
wxCHECK_RET(m_Table != NULL, wxT("You must call wxEncodingConverter::Init() before actually converting!"));
for (i = input, o = output; *i != 0;)
*(o++) = (wchar_t)(m_Table[(wxUint8)*(i++)]);
*o = 0;
}
#endif // wxUSE_WCHAR_T
wxString wxEncodingConverter::Convert(const wxString& input)
{
if (m_JustCopy) return input;
wxString s;
const wxChar *i;
wxCHECK_MSG(m_Table != NULL, s,
wxT("You must call wxEncodingConverter::Init() before actually converting!"));
if (m_UnicodeInput)
{
for (i = input.c_str(); *i != 0; i++)
s << (wxChar)(m_Table[(wxUint16)*i]);
}
else
{
for (i = input.c_str(); *i != 0; i++)
s << (wxChar)(m_Table[(wxUint8)*i]);
}
return s;
}
// Following tables describe classes of encoding equivalence.
//
#define STOP wxFONTENCODING_SYSTEM
#define NUM_OF_PLATFORMS 4 /*must conform to enum wxPLATFORM_XXXX !!!*/
#define ENC_PER_PLATFORM 5
// max no. of encodings for one language used on one platform
// Anybody thinks 5 is not enough? ;-)
static wxFontEncoding
EquivalentEncodings[][NUM_OF_PLATFORMS][ENC_PER_PLATFORM+1] = {
// *** Please put more common encodings as first! ***
// Western European
{
/* unix */ {wxFONTENCODING_ISO8859_1, wxFONTENCODING_ISO8859_15, STOP},
/* windows */ {wxFONTENCODING_CP1252, STOP},
/* os2 */ {STOP},
/* mac */ {STOP}
},
// Central European
{
/* unix */ {wxFONTENCODING_ISO8859_2, STOP},
/* windows */ {wxFONTENCODING_CP1250, STOP},
/* os2 */ {STOP},
/* mac */ {STOP}
},
// Baltic
{
/* unix */ {wxFONTENCODING_ISO8859_13, wxFONTENCODING_ISO8859_4, STOP},
/* windows */ {wxFONTENCODING_CP1257, STOP},
/* os2 */ {STOP},
/* mac */ {STOP}
},
// Hebrew
{
/* unix */ {wxFONTENCODING_ISO8859_8, STOP},
/* windows */ {wxFONTENCODING_CP1255, STOP},
/* os2 */ {STOP},
/* mac */ {STOP}
},
// Greek
{
/* unix */ {wxFONTENCODING_ISO8859_7, STOP},
/* windows */ {wxFONTENCODING_CP1253, STOP},
/* os2 */ {STOP},
/* mac */ {STOP}
},
// Arabic
{
/* unix */ {wxFONTENCODING_ISO8859_6, STOP},
/* windows */ {wxFONTENCODING_CP1256, STOP},
/* os2 */ {STOP},
/* mac */ {STOP}
},
// Turkish
{
/* unix */ {wxFONTENCODING_ISO8859_9, STOP},
/* windows */ {wxFONTENCODING_CP1254, STOP},
/* os2 */ {STOP},
/* mac */ {STOP}
},
// Cyrillic
{
/* unix */ {wxFONTENCODING_KOI8, wxFONTENCODING_ISO8859_5, STOP},
/* windows */ {wxFONTENCODING_CP1251, STOP},
/* os2 */ {STOP},
/* mac */ {STOP}
},
{{STOP},{STOP},{STOP},{STOP}} /* Terminator */
/* no, _not_ Arnold! */
};
wxFontEncodingArray wxEncodingConverter::GetPlatformEquivalents(wxFontEncoding enc, int platform)
{
if (platform == wxPLATFORM_CURRENT)
{
#if defined(__WXMSW__)
platform = wxPLATFORM_WINDOWS;
#elif defined(__WXGTK__) || defined(__WXMOTIF__)
platform = wxPLATFORM_UNIX;
#elif defined(__WXOS2__)
platform = wxPLATFORM_OS2;
#elif defined(__WXMAC__)
platform = wxPLATFORM_MAC;
#endif
}
int i, clas, e ;
wxFontEncoding *f;
wxFontEncodingArray arr;
clas = 0;
while (EquivalentEncodings[clas][0][0] != STOP)
{
for (i = 0; i < NUM_OF_PLATFORMS; i++)
for (e = 0; EquivalentEncodings[clas][i][e] != STOP; e++)
if (EquivalentEncodings[clas][i][e] == enc)
{
for (f = EquivalentEncodings[clas][platform]; *f != STOP; f++)
if (*f == enc) arr.Add(enc);
for (f = EquivalentEncodings[clas][platform]; *f != STOP; f++)
if (arr.Index(*f) == wxNOT_FOUND) arr.Add(*f);
i = NUM_OF_PLATFORMS/*hack*/; break;
}
clas++;
}
return arr;
}
wxFontEncodingArray wxEncodingConverter::GetAllEquivalents(wxFontEncoding enc)
{
int i, clas, e, j ;
wxFontEncoding *f;
wxFontEncodingArray arr;
arr = GetPlatformEquivalents(enc); // we want them to be first items in array
clas = 0;
while (EquivalentEncodings[clas][0][0] != STOP)
{
for (i = 0; i < NUM_OF_PLATFORMS; i++)
for (e = 0; EquivalentEncodings[clas][i][e] != STOP; e++)
if (EquivalentEncodings[clas][i][e] == enc)
{
for (j = 0; j < NUM_OF_PLATFORMS; j++)
for (f = EquivalentEncodings[clas][j]; *f != STOP; f++)
if (arr.Index(*f) == wxNOT_FOUND) arr.Add(*f);
i = NUM_OF_PLATFORMS/*hack*/; break;
}
clas++;
}
return arr;
}
#endif // wxUSE_FONTMAP