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optimized wxMBConvStringUTF8::ToWchar() for ASCII characters

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@48427 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Václav Slavík
2007-08-28 10:40:40 +00:00
parent c59a09cfea
commit 5367a38ad3
1 changed files with 61 additions and 46 deletions
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107
src/common/strconv.cpp
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@@ -778,58 +778,73 @@ wxMBConvStrictUTF8::ToWChar(wchar_t *dst, size_t dstLen,
return written;
}
unsigned char c = *p;
unsigned len = tableUtf8Lengths[c];
if ( !len )
break;
if ( srcLen < len ) // the test works for wxNO_LEN too
break;
if ( srcLen != wxNO_LEN )
srcLen -= len;
if ( out && !dstLen-- )
break;
wxUint32 code;
unsigned char c = *p;
// Char. number range | UTF-8 octet sequence
// (hexadecimal) | (binary)
// ----------------------+---------------------------------------------
// 0000 0000 - 0000 007F | 0xxxxxxx
// 0000 0080 - 0000 07FF | 110xxxxx 10xxxxxx
// 0000 0800 - 0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx
// 0001 0000 - 0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
//
// Code point value is stored in bits marked with 'x', lowest-order bit
// of the value on the right side in the diagram above.
// (from RFC 3629)
// mask to extract lead byte's value ('x' bits above), by sequence length:
static const unsigned char leadValueMask[] = { 0x7F, 0x1F, 0x0F, 0x07 };
// mask and value of lead byte's most significant bits, by length:
static const unsigned char leadMarkerMask[] = { 0x80, 0xE0, 0xF0, 0xF8 };
static const unsigned char leadMarkerVal[] = { 0x00, 0xC0, 0xE0, 0xF0 };
len--; // it's more convenient to work with 0-based length here
// extract the lead byte's value bits:
if ( (c & leadMarkerMask[len]) != leadMarkerVal[len] )
break;
wxUint32 code = c & leadValueMask[len];
// all remaining bytes, if any, are handled in the same way regardless of
// sequence's length:
for ( ; len; --len )
if ( c < 0x80 )
{
c = *++p;
if ( (c & 0xC0) != 0x80 )
return wxCONV_FAILED;
if ( srcLen == 0 ) // the test works for wxNO_LEN too
break;
code <<= 6;
code |= c & 0x3F;
if ( srcLen != wxNO_LEN )
srcLen--;
code = c;
}
else
{
unsigned len = tableUtf8Lengths[c];
if ( !len )
break;
if ( srcLen < len ) // the test works for wxNO_LEN too
break;
if ( srcLen != wxNO_LEN )
srcLen -= len;
// Char. number range | UTF-8 octet sequence
// (hexadecimal) | (binary)
// ----------------------+----------------------------------------
// 0000 0000 - 0000 007F | 0xxxxxxx
// 0000 0080 - 0000 07FF | 110xxxxx 10xxxxxx
// 0000 0800 - 0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx
// 0001 0000 - 0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
//
// Code point value is stored in bits marked with 'x',
// lowest-order bit of the value on the right side in the diagram
// above. (from RFC 3629)
// mask to extract lead byte's value ('x' bits above), by sequence
// length:
static const unsigned char leadValueMask[] = { 0x7F, 0x1F, 0x0F, 0x07 };
// mask and value of lead byte's most significant bits, by length:
static const unsigned char leadMarkerMask[] = { 0x80, 0xE0, 0xF0, 0xF8 };
static const unsigned char leadMarkerVal[] = { 0x00, 0xC0, 0xE0, 0xF0 };
len--; // it's more convenient to work with 0-based length here
// extract the lead byte's value bits:
if ( (c & leadMarkerMask[len]) != leadMarkerVal[len] )
break;
code = c & leadValueMask[len];
// all remaining bytes, if any, are handled in the same way
// regardless of sequence's length:
for ( ; len; --len )
{
c = *++p;
if ( (c & 0xC0) != 0x80 )
return wxCONV_FAILED;
code <<= 6;
code |= c & 0x3F;
}
}
#ifdef WC_UTF16