X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/22886fb3c34356d015591846f343344733a03149..a552d1201fd615730d7c0662a65df306fe18c274:/include/wx/strconv.h?ds=sidebyside diff --git a/include/wx/strconv.h b/include/wx/strconv.h index 53b74ca6cc..c56ae9af2f 100644 --- a/include/wx/strconv.h +++ b/include/wx/strconv.h @@ -1,16 +1,17 @@ /////////////////////////////////////////////////////////////////////////////// // Name: strconv.h // Purpose: conversion routines for char sets any Unicode -// Author: Robert Roebling, Ove Kaaven +// Author: Ove Kaaven, Robert Roebling, Vadim Zeitlin // Modified by: // Created: 29/01/98 // RCS-ID: $Id$ -// Copyright: (c) 1998 Ove Kaaven, Robert Roebling, Vadim Zeitlin +// Copyright: (c) 1998 Ove Kaaven, Robert Roebling +// (c) 1998-2006 Vadim Zeitlin // Licence: wxWindows licence /////////////////////////////////////////////////////////////////////////////// -#ifndef _WX_WXSTRCONVH__ -#define _WX_WXSTRCONVH__ +#ifndef _WX_STRCONV_H_ +#define _WX_STRCONV_H_ #include "wx/defs.h" #include "wx/wxchar.h" @@ -28,31 +29,67 @@ #if wxUSE_WCHAR_T +// the error value returned by wxMBConv methods +#define wxCONV_FAILED ((size_t)-1) + +// the default value for some length parameters meaning that the string is +// NUL-terminated +#define wxNO_LEN ((size_t)-1) + // ---------------------------------------------------------------------------- // wxMBConv (abstract base class for conversions) // ---------------------------------------------------------------------------- +// When deriving a new class from wxMBConv you must reimplement ToWChar() and +// FromWChar() methods which are not pure virtual only for historical reasons, +// don't let the fact that the existing classes implement MB2WC/WC2MB() instead +// confuse you. +// +// You also have to implement Clone() to allow copying the conversions +// polymorphically. +// +// And you might need to override GetMBNulLen() as well. class WXDLLIMPEXP_BASE wxMBConv { public: - // The functions doing actual conversion. On success, the return value is - // the length (i.e. the number of characters, not bytes, and not counting - // the trailing L'\0') of the converted string. On failure, (size_t)-1 is - // returned. In the special case when outputBuf is NULL the return value is - // the same one but nothing is written to the buffer. + // The functions doing actual conversion from/to narrow to/from wide + // character strings. // - // Note that outLen is the length of the output buffer, not the length of - // the input (which is always supposed to be terminated by one or more - // NULs, as appropriate for the encoding)! - virtual size_t MB2WC(wchar_t *out, const char *in, size_t outLen) const = 0; - virtual size_t WC2MB(char *out, const wchar_t *in, size_t outLen) const = 0; + // On success, the return value is the length (i.e. the number of + // characters, not bytes) of the converted string including any trailing + // L'\0' or (possibly multiple) '\0'(s). If the conversion fails or if + // there is not enough space for everything, including the trailing NUL + // character(s), in the output buffer, wxCONV_FAILED is returned. + // + // In the special case when dstLen is 0 (outputBuf may be NULL then) the + // return value is the length of the needed buffer but nothing happens + // otherwise. If srcLen is wxNO_LEN, the entire string, up to and + // including the trailing NUL(s), is converted, otherwise exactly srcLen + // bytes are. + // + // Typical usage: + // + // size_t dstLen = conv.ToWChar(NULL, 0, src); + // if ( dstLen != wxCONV_FAILED ) + // ... handle error ... + // wchar_t *wbuf = new wchar_t[dstLen]; + // conv.ToWChar(wbuf, dstLen, src); + // + 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; - // MB <-> WC + + // Convenience functions for translating NUL-terminated strings: returns + // the buffer containing the converted string or NULL pointer if the + // conversion failed. const wxWCharBuffer cMB2WC(const char *in) const; const wxCharBuffer cWC2MB(const wchar_t *in) const; - // Functions converting strings which may contain embedded NULs and don't - // have to be NUL-terminated. + // 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 @@ -81,19 +118,49 @@ public: const wxWCharBuffer cWX2WC(const char *psz) const { return cMB2WC(psz); } #endif // Unicode/ANSI - // virtual dtor for any base class - virtual ~wxMBConv(); + // this function is used in the implementation of cMB2WC() to distinguish + // between the following cases: + // + // a) var width encoding with strings terminated by a single NUL + // (usual multibyte encodings): return 1 in this case + // b) fixed width encoding with 2 bytes/char and so terminated by + // 2 NULs (UTF-16/UCS-2 and variants): return 2 in this case + // c) fixed width encoding with 4 bytes/char and so terminated by + // 4 NULs (UTF-32/UCS-4 and variants): return 4 in this case + // + // anything else is not supported currently and -1 should be returned + virtual size_t GetMBNulLen() const { return 1; } -private: - // this function must return the multibyte representation of L'\0' + // return the maximal value currently returned by GetMBNulLen() for any + // encoding + static size_t GetMaxMBNulLen() { return 4 /* for UTF-32 */; } + + + // The old conversion functions. The existing classes currently mostly + // implement these ones but we're in transition to using To/FromWChar() + // instead and any new classes should implement just the new functions. + // For now, however, we provide default implementation of To/FromWChar() in + // this base class in terms of MB2WC/WC2MB() to avoid having to rewrite all + // the conversions at once. // - // on error, nulLen should be set to -1 - virtual const char *GetMBNul(size_t *nulLen) const - { - *nulLen = 1; + // On success, the return value is the length (i.e. the number of + // characters, not bytes) not counting the trailing NUL(s) of the converted + // string. On failure, (size_t)-1 is returned. In the special case when + // outputBuf is NULL the return value is the same one but nothing is + // written to the buffer. + // + // Note that outLen is the length of the output buffer, not the length of + // the input (which is always supposed to be terminated by one or more + // NULs, as appropriate for the encoding)! + virtual size_t MB2WC(wchar_t *out, const char *in, size_t outLen) const; + virtual size_t WC2MB(char *out, const wchar_t *in, size_t outLen) const; - return ""; - } + + // make a heap-allocated copy of this object + virtual wxMBConv *Clone() const = 0; + + // virtual dtor for any base class + virtual ~wxMBConv(); }; // ---------------------------------------------------------------------------- @@ -106,6 +173,8 @@ class WXDLLIMPEXP_BASE wxMBConvLibc : 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; + + virtual wxMBConv *Clone() const { return new wxMBConvLibc; } }; #ifdef __UNIX__ @@ -121,6 +190,11 @@ class WXDLLIMPEXP_BASE wxConvBrokenFileNames : public wxMBConv { public: wxConvBrokenFileNames(const wxChar *charset); + wxConvBrokenFileNames(const wxConvBrokenFileNames& conv) + : wxMBConv(), + m_conv(conv.m_conv ? conv.m_conv->Clone() : NULL) + { + } virtual ~wxConvBrokenFileNames() { delete m_conv; } virtual size_t MB2WC(wchar_t *out, const char *in, size_t outLen) const @@ -133,16 +207,19 @@ public: return m_conv->WC2MB(out, in, outLen); } -private: - virtual const char *GetMBNul(size_t *nulLen) const + virtual size_t GetMBNulLen() const { // cast needed to call a private function - return ((wxConvBrokenFileNames *)m_conv)->GetMBNul(nulLen); + return m_conv->GetMBNulLen(); } + virtual wxMBConv *Clone() const { return new wxConvBrokenFileNames(*this); } +private: // the conversion object we forward to wxMBConv *m_conv; + + DECLARE_NO_ASSIGN_CLASS(wxConvBrokenFileNames) }; #endif // __UNIX__ @@ -156,6 +233,8 @@ 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; + + virtual wxMBConv *Clone() const { return new wxMBConvUTF7; } }; // ---------------------------------------------------------------------------- @@ -165,7 +244,8 @@ public: class WXDLLIMPEXP_BASE wxMBConvUTF8 : public wxMBConv { public: - enum { + enum + { MAP_INVALID_UTF8_NOT = 0, MAP_INVALID_UTF8_TO_PUA = 1, MAP_INVALID_UTF8_TO_OCTAL = 2 @@ -175,6 +255,8 @@ 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; + virtual wxMBConv *Clone() const { return new wxMBConvUTF8(m_options); } + private: int m_options; }; @@ -185,12 +267,17 @@ private: class WXDLLIMPEXP_BASE wxMBConvUTF16Base : public wxMBConv { -private: - virtual const char *GetMBNul(size_t *nulLen) const - { - *nulLen = 2; - return "\0"; - } +public: + enum { BYTES_PER_CHAR = 2 }; + + virtual size_t GetMBNulLen() const { return BYTES_PER_CHAR; } + +protected: + // return the length of the buffer using srcLen if it's not wxNO_LEN and + // computing the length ourselves if it is; also checks that the length is + // even if specified as we need an entire number of UTF-16 characters and + // returns wxNO_LEN which indicates error if it is odd + static size_t GetLength(const char *src, size_t srcLen); }; // ---------------------------------------------------------------------------- @@ -200,8 +287,11 @@ private: class WXDLLIMPEXP_BASE wxMBConvUTF16LE : public wxMBConvUTF16Base { 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; + 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 wxMBConvUTF16LE; } }; // ---------------------------------------------------------------------------- @@ -211,8 +301,11 @@ public: class WXDLLIMPEXP_BASE wxMBConvUTF16BE : public wxMBConvUTF16Base { 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; + 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 wxMBConvUTF16BE; } }; // ---------------------------------------------------------------------------- @@ -221,12 +314,16 @@ public: class WXDLLIMPEXP_BASE wxMBConvUTF32Base : public wxMBConv { -private: - virtual const char *GetMBNul(size_t *nulLen) const - { - *nulLen = 4; - return "\0\0\0"; - } +public: + enum { BYTES_PER_CHAR = 4 }; + + virtual size_t GetMBNulLen() const { return BYTES_PER_CHAR; } + +protected: + // this is similar to wxMBConvUTF16Base method with the same name except + // that, of course, it verifies that length is divisible by 4 if given and + // not by 2 + static size_t GetLength(const char *src, size_t srcLen); }; // ---------------------------------------------------------------------------- @@ -236,8 +333,11 @@ private: class WXDLLIMPEXP_BASE wxMBConvUTF32LE : public wxMBConvUTF32Base { 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; + 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 wxMBConvUTF32LE; } }; // ---------------------------------------------------------------------------- @@ -247,8 +347,11 @@ public: class WXDLLIMPEXP_BASE wxMBConvUTF32BE : public wxMBConvUTF32Base { 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; + 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 wxMBConvUTF32BE; } }; // ---------------------------------------------------------------------------- @@ -272,8 +375,10 @@ 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; + virtual size_t GetMBNulLen() const; + virtual wxMBConv *Clone() const { return new wxCSConv(*this); } - void Clear() ; + void Clear(); private: // common part of all ctors @@ -289,8 +394,6 @@ private: // charset string void SetName(const wxChar *charset); - virtual const char *GetMBNul(size_t *nulLen) const; - // note that we can't use wxString here because of compilation // dependencies: we're included from wx/string.h @@ -332,9 +435,14 @@ extern WXDLLIMPEXP_DATA_BASE(wxMBConv *) wxConvFileName; // default in a couple of places inside wx (initially same as wxConvLibc) extern WXDLLIMPEXP_DATA_BASE(wxMBConv *) wxConvCurrent; -// ??? +// the conversion corresponding to the current locale extern WXDLLIMPEXP_DATA_BASE(wxCSConv&) wxConvLocal; +// the conversion corresponding to the encoding of the standard UI elements +// +// by default this is the same as wxConvLocal but may be changed if the program +// needs to use a fixed encoding +extern WXDLLIMPEXP_DATA_BASE(wxMBConv *) wxConvUI; // ---------------------------------------------------------------------------- // endianness-dependent conversions @@ -411,6 +519,5 @@ extern WXDLLIMPEXP_DATA_BASE(wxMBConv *) wxConvCurrent; #define wxConvertMB2WX(s) (s) #endif // Unicode/ANSI -#endif - // _WX_WXSTRCONVH__ +#endif // _WX_STRCONV_H_