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Add wxMBConv::GetMaxCharLen()

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This is not used yet, but will be needed soon in order to determine
whether we have sufficiently many to decode them.
This commit is contained in:
Vadim Zeitlin
2019-04-21 20:04:52 +02:00
parent bd37af32b1
commit af83769bd0
2 changed files with 40 additions and 0 deletions
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20
include/wx/strconv.h
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@@ -32,6 +32,8 @@ class WXDLLIMPEXP_FWD_BASE wxString;
// don't let the fact that the existing classes implement MB2WC/WC2MB() instead
// confuse you.
//
// For many encodings you must override GetMaxCharLen().
//
// You also have to implement Clone() to allow copying the conversions
// polymorphically.
//
@@ -118,6 +120,10 @@ public:
wxWCharBuffer cWX2WC(const char *psz) const { return cMB2WC(psz); }
#endif // Unicode/ANSI
// return the maximum number of bytes that can be required to encode a
// single character in this encoding, e.g. 4 for UTF-8
virtual size_t GetMaxCharLen() const { return 1; }
// this function is used in the implementation of cMB2WC() to distinguish
// between the following cases:
//
@@ -254,6 +260,8 @@ public:
virtual size_t FromWChar(char *dst, size_t dstLen,
const wchar_t *src, size_t srcLen = wxNO_LEN) const wxOVERRIDE;
virtual size_t GetMaxCharLen() const wxOVERRIDE { return 4; }
virtual wxMBConv *Clone() const wxOVERRIDE { return new wxMBConvUTF7; }
private:
@@ -341,6 +349,8 @@ public:
virtual size_t FromWChar(char *dst, size_t dstLen,
const wchar_t *src, size_t srcLen = wxNO_LEN) const wxOVERRIDE;
virtual size_t GetMaxCharLen() const wxOVERRIDE { return 4; }
virtual wxMBConv *Clone() const wxOVERRIDE { return new wxMBConvStrictUTF8(); }
// NB: other mapping modes are not, strictly speaking, UTF-8, so we can't
@@ -365,6 +375,8 @@ public:
virtual size_t FromWChar(char *dst, size_t dstLen,
const wchar_t *src, size_t srcLen = wxNO_LEN) const wxOVERRIDE;
virtual size_t GetMaxCharLen() const wxOVERRIDE { return 4; }
virtual wxMBConv *Clone() const wxOVERRIDE { return new wxMBConvUTF8(m_options); }
// NB: other mapping modes are not, strictly speaking, UTF-8, so we can't
@@ -405,6 +417,7 @@ public:
const char *src, size_t srcLen = wxNO_LEN) const wxOVERRIDE;
virtual size_t FromWChar(char *dst, size_t dstLen,
const wchar_t *src, size_t srcLen = wxNO_LEN) const wxOVERRIDE;
virtual size_t GetMaxCharLen() const wxOVERRIDE { return 4; }
virtual wxMBConv *Clone() const wxOVERRIDE { return new wxMBConvUTF16LE; }
};
@@ -419,6 +432,7 @@ public:
const char *src, size_t srcLen = wxNO_LEN) const wxOVERRIDE;
virtual size_t FromWChar(char *dst, size_t dstLen,
const wchar_t *src, size_t srcLen = wxNO_LEN) const wxOVERRIDE;
virtual size_t GetMaxCharLen() const wxOVERRIDE { return 4; }
virtual wxMBConv *Clone() const wxOVERRIDE { return new wxMBConvUTF16BE; }
};
@@ -451,6 +465,7 @@ public:
const char *src, size_t srcLen = wxNO_LEN) const wxOVERRIDE;
virtual size_t FromWChar(char *dst, size_t dstLen,
const wchar_t *src, size_t srcLen = wxNO_LEN) const wxOVERRIDE;
virtual size_t GetMaxCharLen() const wxOVERRIDE { return 4; }
virtual wxMBConv *Clone() const wxOVERRIDE { return new wxMBConvUTF32LE; }
};
@@ -465,6 +480,7 @@ public:
const char *src, size_t srcLen = wxNO_LEN) const wxOVERRIDE;
virtual size_t FromWChar(char *dst, size_t dstLen,
const wchar_t *src, size_t srcLen = wxNO_LEN) const wxOVERRIDE;
virtual size_t GetMaxCharLen() const wxOVERRIDE { return 4; }
virtual wxMBConv *Clone() const wxOVERRIDE { return new wxMBConvUTF32BE; }
};
@@ -566,6 +582,10 @@ public:
FromWChar(char *dst, size_t dstLen,
const wchar_t *src, size_t srcLen = wxNO_LEN) const wxOVERRIDE;
// Use the value for UTF-8 here to make sure we try to decode up to 4 bytes
// as UTF-8 before giving up.
virtual size_t GetMaxCharLen() const wxOVERRIDE { return 4; }
virtual wxMBConv *Clone() const wxOVERRIDE
{
return new wxWhateverWorksConv();