// Convenience functions for converting strings which may contain embedded
// NULs and don't have to be NUL-terminated.
//
- // inLen is the length of the buffer including trailing NUL if any: if the
- // last 4 bytes of the buffer are all NULs, these functions are more
- // efficient as they avoid copying the string, but otherwise a copy is made
- // internally which could be quite bad for (very) long strings.
+ // inLen is the length of the buffer including trailing NUL if any or
+ // wxNO_LEN if the input is NUL-terminated.
//
// outLen receives, if not NULL, the length of the converted string or 0 if
// the conversion failed (returning 0 and not -1 in this case makes it
// difficult to distinguish between failed conversion and empty input but
- // this is done for backwards compatibility)
+ // this is done for backwards compatibility). Notice that the rules for
+ // whether outLen accounts or not for the last NUL are the same as for
+ // To/FromWChar() above: if inLen is specified, outLen is exactly the
+ // number of characters converted, whether the last one of them was NUL or
+ // not. But if inLen == wxNO_LEN then outLen doesn't account for the last
+ // NUL even though it is present.
const wxWCharBuffer
cMB2WC(const char *in, size_t inLen, size_t *outLen) const;
const wxCharBuffer
class WXDLLIMPEXP_BASE wxMBConvUTF7 : public wxMBConv
{
public:
- virtual size_t MB2WC(wchar_t *outputBuf, const char *psz, size_t outputSize) const;
- virtual size_t WC2MB(char *outputBuf, const wchar_t *psz, size_t outputSize) const;
+ wxMBConvUTF7() { }
+
+ // compiler-generated copy ctor, assignment operator and dtor are ok
+ // (assuming it's ok to copy the shift state -- not really sure about it)
+
+ virtual size_t ToWChar(wchar_t *dst, size_t dstLen,
+ const char *src, size_t srcLen = wxNO_LEN) const;
+ virtual size_t FromWChar(char *dst, size_t dstLen,
+ const wchar_t *src, size_t srcLen = wxNO_LEN) const;
virtual wxMBConv *Clone() const { return new wxMBConvUTF7; }
+
+private:
+ // UTF-7 decoder/encoder may be in direct mode or in shifted mode after a
+ // '+' (and until the '-' or any other non-base64 character)
+ struct StateMode
+ {
+ enum Mode
+ {
+ Direct, // pass through state
+ Shifted // after a '+' (and before '-')
+ };
+ };
+
+ // the current decoder state: this is only used by ToWChar() if srcLen
+ // parameter is not wxNO_LEN, when working on the entire NUL-terminated
+ // strings we neither update nor use the state
+ class DecoderState : StateMode
+ {
+ private:
+ // current state: this one is private as we want to enforce the use of
+ // ToDirect/ToShifted() methods below
+ Mode mode;
+
+ public:
+ // the initial state is direct
+ DecoderState() { mode = Direct; }
+
+ // switch to/from shifted mode
+ void ToDirect() { mode = Direct; }
+ void ToShifted() { mode = Shifted; accum = bit = 0; isLSB = false; }
+
+ bool IsDirect() const { return mode == Direct; }
+ bool IsShifted() const { return mode == Shifted; }
+
+
+ // these variables are only used in shifted mode
+
+ unsigned int accum; // accumulator of the bit we've already got
+ unsigned int bit; // the number of bits consumed mod 8
+ unsigned char msb; // the high byte of UTF-16 word
+ bool isLSB; // whether we're decoding LSB or MSB of UTF-16 word
+ };
+
+ DecoderState m_stateDecoder;
+
+
+ // encoder state is simpler as we always receive entire Unicode characters
+ // on input
+ class EncoderState : StateMode
+ {
+ private:
+ Mode mode;
+
+ public:
+ EncoderState() { mode = Direct; }
+
+ void ToDirect() { mode = Direct; }
+ void ToShifted() { mode = Shifted; accum = bit = 0; }
+
+ bool IsDirect() const { return mode == Direct; }
+ bool IsShifted() const { return mode == Shifted; }
+
+ unsigned int accum;
+ unsigned int bit;
+ };
+
+ EncoderState m_stateEncoder;
};
// ----------------------------------------------------------------------------
const char *src, size_t srcLen = wxNO_LEN) const;
virtual size_t FromWChar(char *dst, size_t dstLen,
const wchar_t *src, size_t srcLen = wxNO_LEN) const;
- virtual size_t MB2WC(wchar_t *outputBuf, const char *psz, size_t outputSize) const;
- virtual size_t WC2MB(char *outputBuf, const wchar_t *psz, size_t outputSize) const;
virtual size_t GetMBNulLen() const;
#if wxUSE_UNICODE_UTF8
void Clear();
- // return true if the conversion could be initilized successfully
+ // return true if the conversion could be initialized successfully
bool IsOk() const;
private:
wxMBConv *DoCreate() const;
// set the name (may be only called when m_name == NULL), makes copy of
- // charset string
+ // the charset string
void SetName(const char *charset);
+ // m_name may be NULL in which case m_encoding should be used
+ //
// note that we can't use wxString here because of compilation
// dependencies: we're included from wx/string.h
char *m_name;
+
+ // may be wxFONTENCODING_SYSTEM in which case m_name is used
+ //
+ // if m_name is NULL, then we should use the default system encoding
wxFontEncoding m_encoding;
// use CreateConvIfNeeded() before accessing m_convReal!
projects / wxWidgets.git / blobdiff