mirror of
https://github.com/dolphin-emu/dolphin.git
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d14efe561b
long become wxWidgets 2.9.2, which in turn is expected to be the last 2.9 release before the 3.0 stable release. Since the full wxWidgets distribution is rather large, I have imported only the parts that we use, on a subdirectory basis: art include/wx/*.* include/wx/aui include/wx/cocoa include/wx/generic include/wx/gtk include/wx/meta include/wx/msw include/wx/osx include/wx/persist include/wx/private include/wx/protocol include/wx/unix src/aui src/common src/generic src/gtk src/msw src/osx src/unix git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@7380 8ced0084-cf51-0410-be5f-012b33b47a6e
318 lines
11 KiB
C++
318 lines
11 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: src/common/stringops.cpp
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// Purpose: implementation of wxString primitive operations
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// Author: Vaclav Slavik
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// Modified by:
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// Created: 2007-04-16
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// RCS-ID: $Id: stringops.cpp 61508 2009-07-23 20:30:22Z VZ $
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// Copyright: (c) 2007 REA Elektronik GmbH
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// ===========================================================================
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// headers
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// ===========================================================================
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#ifndef WX_PRECOMP
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#include "wx/stringops.h"
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#endif
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// ===========================================================================
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// implementation
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// ===========================================================================
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#if wxUSE_UNICODE_UTF8
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// ---------------------------------------------------------------------------
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// UTF-8 sequences lengths
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// ---------------------------------------------------------------------------
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const unsigned char wxStringOperationsUtf8::ms_utf8IterTable[256] = {
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// single-byte sequences (ASCII):
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 00..0F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 10..1F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 20..2F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 30..3F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 40..4F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 50..5F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 60..6F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 70..7F
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// these are invalid, we use step 1 to skip
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// over them (should never happen):
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 80..8F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 90..9F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // A0..AF
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // B0..BF
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1, 1, // C0,C1
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// two-byte sequences:
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // C2..CF
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // D0..DF
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// three-byte sequences:
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // E0..EF
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// four-byte sequences:
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4, 4, 4, 4, 4, // F0..F4
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// these are invalid again (5- or 6-byte
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// sequences and sequences for code points
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// above U+10FFFF, as restricted by RFC 3629):
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 // F5..FF
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};
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// ---------------------------------------------------------------------------
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// UTF-8 operations
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// ---------------------------------------------------------------------------
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//
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// Table 3.1B from Unicode spec: Legal UTF-8 Byte Sequences
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//
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// Code Points | 1st Byte | 2nd Byte | 3rd Byte | 4th Byte |
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// -------------------+----------+----------+----------+----------+
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// U+0000..U+007F | 00..7F | | | |
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// U+0080..U+07FF | C2..DF | 80..BF | | |
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// U+0800..U+0FFF | E0 | A0..BF | 80..BF | |
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// U+1000..U+FFFF | E1..EF | 80..BF | 80..BF | |
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// U+10000..U+3FFFF | F0 | 90..BF | 80..BF | 80..BF |
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// U+40000..U+FFFFF | F1..F3 | 80..BF | 80..BF | 80..BF |
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// U+100000..U+10FFFF | F4 | 80..8F | 80..BF | 80..BF |
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// -------------------+----------+----------+----------+----------+
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bool wxStringOperationsUtf8::IsValidUtf8String(const char *str, size_t len)
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{
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if ( !str )
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return true; // empty string is UTF8 string
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const unsigned char *c = (const unsigned char*)str;
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const unsigned char * const end = (len == wxStringImpl::npos) ? NULL : c + len;
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for ( ; c != end && *c; ++c )
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{
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unsigned char b = *c;
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if ( end != NULL )
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{
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// if the string is not NULL-terminated, verify we have enough
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// bytes in it left for current character's encoding:
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if ( c + ms_utf8IterTable[*c] > end )
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return false;
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}
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if ( b <= 0x7F ) // 00..7F
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continue;
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else if ( b < 0xC2 ) // invalid lead bytes: 80..C1
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return false;
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// two-byte sequences:
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else if ( b <= 0xDF ) // C2..DF
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{
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b = *(++c);
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if ( !(b >= 0x80 && b <= 0xBF ) )
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return false;
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}
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// three-byte sequences:
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else if ( b == 0xE0 )
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{
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b = *(++c);
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if ( !(b >= 0xA0 && b <= 0xBF ) )
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return false;
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b = *(++c);
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if ( !(b >= 0x80 && b <= 0xBF ) )
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return false;
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}
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else if ( b == 0xED )
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{
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b = *(++c);
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if ( !(b >= 0x80 && b <= 0x9F ) )
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return false;
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b = *(++c);
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if ( !(b >= 0x80 && b <= 0xBF ) )
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return false;
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}
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else if ( b <= 0xEF ) // E1..EC EE..EF
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{
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for ( int i = 0; i < 2; ++i )
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{
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b = *(++c);
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if ( !(b >= 0x80 && b <= 0xBF ) )
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return false;
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}
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}
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// four-byte sequences:
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else if ( b == 0xF0 )
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{
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b = *(++c);
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if ( !(b >= 0x90 && b <= 0xBF ) )
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return false;
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for ( int i = 0; i < 2; ++i )
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{
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b = *(++c);
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if ( !(b >= 0x80 && b <= 0xBF ) )
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return false;
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}
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}
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else if ( b <= 0xF3 ) // F1..F3
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{
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for ( int i = 0; i < 3; ++i )
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{
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b = *(++c);
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if ( !(b >= 0x80 && b <= 0xBF ) )
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return false;
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}
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}
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else if ( b == 0xF4 )
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{
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b = *(++c);
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if ( !(b >= 0x80 && b <= 0x8F ) )
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return false;
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for ( int i = 0; i < 2; ++i )
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{
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b = *(++c);
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if ( !(b >= 0x80 && b <= 0xBF ) )
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return false;
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}
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}
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else // otherwise, it's invalid lead byte
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return false;
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}
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return true;
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}
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// NB: this is in this file and not unichar.cpp to keep all UTF-8 encoding
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// code in single place
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wxUniChar::Utf8CharBuffer wxUniChar::AsUTF8() const
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{
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Utf8CharBuffer buf = { "" }; // init to avoid g++ 4.1 warning with -O2
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char *out = buf.data;
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value_type code = GetValue();
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// Char. number range | UTF-8 octet sequence
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// (hexadecimal) | (binary)
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// ----------------------+---------------------------------------------
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// 0000 0000 - 0000 007F | 0xxxxxxx
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// 0000 0080 - 0000 07FF | 110xxxxx 10xxxxxx
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// 0000 0800 - 0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx
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// 0001 0000 - 0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
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//
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// Code point value is stored in bits marked with 'x', lowest-order bit
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// of the value on the right side in the diagram above.
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// (from RFC 3629)
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if ( code <= 0x7F )
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{
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out[1] = 0;
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out[0] = (char)code;
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}
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else if ( code <= 0x07FF )
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{
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out[2] = 0;
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// NB: this line takes 6 least significant bits, encodes them as
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// 10xxxxxx and discards them so that the next byte can be encoded:
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out[1] = 0x80 | (code & 0x3F); code >>= 6;
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out[0] = 0xC0 | code;
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}
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else if ( code < 0xFFFF )
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{
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out[3] = 0;
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out[2] = 0x80 | (code & 0x3F); code >>= 6;
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out[1] = 0x80 | (code & 0x3F); code >>= 6;
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out[0] = 0xE0 | code;
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}
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else if ( code <= 0x10FFFF )
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{
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out[4] = 0;
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out[3] = 0x80 | (code & 0x3F); code >>= 6;
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out[2] = 0x80 | (code & 0x3F); code >>= 6;
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out[1] = 0x80 | (code & 0x3F); code >>= 6;
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out[0] = 0xF0 | code;
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}
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else
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{
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wxFAIL_MSG( wxT("trying to encode undefined Unicode character") );
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out[0] = 0;
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}
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return buf;
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}
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wxUniChar
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wxStringOperationsUtf8::DecodeNonAsciiChar(wxStringImpl::const_iterator i)
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{
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wxASSERT( IsValidUtf8LeadByte(*i) );
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wxUniChar::value_type code = 0;
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size_t len = GetUtf8CharLength(*i);
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wxASSERT_MSG( len <= 4, wxT("invalid UTF-8 sequence length") );
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// Char. number range | UTF-8 octet sequence
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// (hexadecimal) | (binary)
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// ----------------------+---------------------------------------------
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// 0000 0000 - 0000 007F | 0xxxxxxx
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// 0000 0080 - 0000 07FF | 110xxxxx 10xxxxxx
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// 0000 0800 - 0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx
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// 0001 0000 - 0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
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//
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// Code point value is stored in bits marked with 'x', lowest-order bit
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// of the value on the right side in the diagram above.
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// (from RFC 3629)
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// mask to extract lead byte's value ('x' bits above), by sequence's length:
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static const unsigned char s_leadValueMask[4] = { 0x7F, 0x1F, 0x0F, 0x07 };
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#if wxDEBUG_LEVEL
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// mask and value of lead byte's most significant bits, by length:
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static const unsigned char s_leadMarkerMask[4] = { 0x80, 0xE0, 0xF0, 0xF8 };
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static const unsigned char s_leadMarkerVal[4] = { 0x00, 0xC0, 0xE0, 0xF0 };
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#endif
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// extract the lead byte's value bits:
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wxASSERT_MSG( ((unsigned char)*i & s_leadMarkerMask[len-1]) ==
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s_leadMarkerVal[len-1],
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wxT("invalid UTF-8 lead byte") );
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code = (unsigned char)*i & s_leadValueMask[len-1];
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// all remaining bytes, if any, are handled in the same way regardless of
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// sequence's length:
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for ( ++i ; len > 1; --len, ++i )
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{
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wxASSERT_MSG( ((unsigned char)*i & 0xC0) == 0x80,
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wxT("invalid UTF-8 byte") );
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code <<= 6;
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code |= (unsigned char)*i & 0x3F;
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}
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return wxUniChar(code);
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}
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wxCharBuffer wxStringOperationsUtf8::EncodeNChars(size_t n, const wxUniChar& ch)
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{
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Utf8CharBuffer once(EncodeChar(ch));
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// the IncIter() table can be used to determine the length of ch's encoding:
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size_t len = ms_utf8IterTable[(unsigned char)once.data[0]];
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wxCharBuffer buf(n * len);
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char *ptr = buf.data();
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for ( size_t i = 0; i < n; i++, ptr += len )
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{
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memcpy(ptr, once.data, len);
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}
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return buf;
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}
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#endif // wxUSE_UNICODE_UTF8
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