bool EncodingDetector::DetectEncoding(const QByteArray& buffer)
{
if (buffer.isEmpty())
return false;
if (buffer.size() >= 4)
{
// BOM is max 4 bytes
char buff[4] = {'\0'};
memcpy(buff, buffer.constData(), 4);
if (memcmp(buff, "\xEF\xBB\xBF", 3) == 0)
{
m_UseBOM = true;
m_BOMSizeInBytes = 3;
m_Encoding = QTextCodec::codecForName("UTF-8");
}
else if (memcmp(buff, "\x00\x00\xFE\xFF", 4) == 0)
{
m_UseBOM = true;
m_BOMSizeInBytes = 4;
m_Encoding = QTextCodec::codecForName("UTF-32BE");
}
else if (memcmp(buff, "\xFF\xFE\x00\x00", 4) == 0)
{
m_UseBOM = true;
m_BOMSizeInBytes = 4;
m_Encoding = QTextCodec::codecForName("UTF-32LE");
}
else if (memcmp(buff, "\xFE\xFF", 2) == 0)
{
m_UseBOM = true;
m_BOMSizeInBytes = 2;
m_Encoding = QTextCodec::codecForName("UTF-16BE");
}
else if (memcmp(buff, "\xFF\xFE", 2) == 0)
{
m_UseBOM = true;
m_BOMSizeInBytes = 2;
m_Encoding = QTextCodec::codecForName("UTF-16LE");
}
}
if (!m_UseBOM)
{
if (DetectUTF8(buffer))
{
m_Encoding = QTextCodec::codecForName("UTF-8");
}
else if (!DetectUTF16(buffer) && !DetectUTF32(buffer))
{
// Use default encoding
m_Encoding = ApplicationManager::settings()->defaultEncoding();
}
m_UseBOM = false;
m_BOMSizeInBytes = 0;
}
return true;
} // end of DetectEncoding
bool EncodingDetector::DetectEncoding(const wxByte* buffer, size_t size, bool ConvertToWxString)
{
ConfigManager* cfgMgr = Manager::Get()->GetConfigManager(_T("editor"));
wxString encname = cfgMgr->Read(_T("/default_encoding"));
if (cfgMgr->ReadInt(_T("/default_encoding/use_option"), 0) == 1)
{
// Bypass C::B's auto-detection
m_Encoding = wxFontMapper::Get()->CharsetToEncoding(encname, false);
if(m_UseLog)
{
wxString msg;
msg.Printf(_T("Warning: bypassing E::B's auto-detection!\n"
"Encoding requested is: %s (ID: %d)"),
wxFontMapper::Get()->GetEncodingDescription(m_Encoding).c_str(),
m_Encoding);
Manager::Get()->GetLogManager()->DebugLog(msg);
}
}
else
{
if (!buffer)
return false;
if (size >= 4)
{
// BOM is max 4 bytes
char buff[4] = {'\0'};
memcpy(buff, buffer, 4);
if (memcmp(buff, "\xEF\xBB\xBF", 3) == 0)
{
m_UseBOM = true;
m_BOMSizeInBytes = 3;
m_Encoding = wxFONTENCODING_UTF8;
}
else if (memcmp(buff, "\x00\x00\xFE\xFF", 4) == 0)
{
m_UseBOM = true;
m_BOMSizeInBytes = 4;
m_Encoding = wxFONTENCODING_UTF32BE;
}
else if (memcmp(buff, "\x00\x00\xFF\xFE", 4) == 0)
{
// 00 00 FF FE UCS-4, unusual octet order BOM (2143)
// X-ISO-10646-UCS-4-2143 can not (yet) be handled by wxWidgets
m_Encoding = (wxFontEncoding)-1;
}
else if (memcmp(buff, "\xFF\xFE\x00\x00", 4) == 0)
{
m_UseBOM = true;
m_BOMSizeInBytes = 4;
m_Encoding = wxFONTENCODING_UTF32LE;
}
else if (memcmp(buff, "\xFE\xFF\x00\x00", 4) == 0)
{
// FE FF 00 00 UCS-4, unusual octet order BOM (3412)
// X-ISO-10646-UCS-4-3412 can not (yet) be handled by wxWidgets
m_Encoding = (wxFontEncoding)-1;
}
else if (memcmp(buff, "\xFE\xFF", 2) == 0)
{
m_UseBOM = true;
m_BOMSizeInBytes = 2;
m_Encoding = wxFONTENCODING_UTF16BE;
}
else if (memcmp(buff, "\xFF\xFE", 2) == 0)
{
m_UseBOM = true;
m_BOMSizeInBytes = 2;
m_Encoding = wxFONTENCODING_UTF16LE;
}
}
if (m_UseBOM)
{
if(m_UseLog)
{
wxString msg;
msg.Printf(_T("Detected encoding via BOM: %s (ID: %d)"),
wxFontMapper::Get()->GetEncodingDescription(m_Encoding).c_str(),
m_Encoding);
Manager::Get()->GetLogManager()->DebugLog(msg);
}
}
// Try our own detection for UTF-16 and UTF-32, the mozilla-version does not work without BOM
else if ( !DetectUTF16((wxByte*)buffer, size) &&
!DetectUTF32((wxByte*)buffer, size) )
{
// if we still have no results try mozilla's detection
m_Encoding = wxFontMapper::Get()->CharsetToEncoding(DoIt((char*)buffer, size), false);
if(m_Encoding == wxFONTENCODING_DEFAULT)
{
wxString enc_name = Manager::Get()->GetConfigManager(_T("editor"))->Read(_T("/default_encoding"), wxLocale::GetSystemEncodingName());
m_Encoding = wxFontMapper::GetEncodingFromName(enc_name);
if(m_UseLog)
{
wxString msg;
msg.Printf(_T("Text seems to be pure ASCII!\n"
"We use user specified encoding: %s (ID: %d)"),
wxFontMapper::Get()->GetEncodingDescription(m_Encoding).c_str(),
m_Encoding);
Manager::Get()->GetLogManager()->DebugLog(msg);
}
}
if (m_Encoding < 0)
{
// Use user-specified one; as a fallback
m_Encoding = wxFontMapper::Get()->CharsetToEncoding(encname, false);
if(m_UseLog)
{
wxString msg;
msg.Printf(_T("Warning: Using user specified encoding as fallback!\n"
"Encoding fallback is: %s (ID: %d)"),
wxFontMapper::Get()->GetEncodingDescription(m_Encoding).c_str(),
m_Encoding);
Manager::Get()->GetLogManager()->DebugLog(msg);
}
}
m_UseBOM = false;
m_BOMSizeInBytes = 0;
}
}
if(m_UseLog)
{
wxString msg;
msg.Printf(_T("Final encoding detected: %s (ID: %d)"),
wxFontMapper::Get()->GetEncodingDescription(m_Encoding).c_str(),
m_Encoding);
Manager::Get()->GetLogManager()->DebugLog(msg);
}
if (ConvertToWxString)
{
ConvertToWxStr(buffer, size);
}
return true;
} // end of DetectEncoding
