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// Scintilla source code edit control
/** @file DBCS.cxx
** Functions to handle DBCS double byte encodings like Shift-JIS.
**/
// Copyright 2017 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
#include "DBCS.h"
using namespace Scintilla::Internal;
namespace Scintilla::Internal {
bool DBCSIsLeadByte(int codePage, char ch) noexcept {
// Byte ranges found in Wikipedia articles with relevant search strings in each case
const unsigned char uch = ch;
switch (codePage) {
case 932:
// Shift_jis
return ((uch >= 0x81) && (uch <= 0x9F)) ||
((uch >= 0xE0) && (uch <= 0xFC));
// Lead bytes F0 to FC may be a Microsoft addition.
case 936:
// GBK
return (uch >= 0x81) && (uch <= 0xFE);
case 949:
// Korean Wansung KS C-5601-1987
return (uch >= 0x81) && (uch <= 0xFE);
case 950:
// Big5
return (uch >= 0x81) && (uch <= 0xFE);
case 1361:
// Korean Johab KS C-5601-1992
return
((uch >= 0x84) && (uch <= 0xD3)) ||
((uch >= 0xD8) && (uch <= 0xDE)) ||
((uch >= 0xE0) && (uch <= 0xF9));
}
return false;
}
bool IsDBCSValidSingleByte(int codePage, int ch) noexcept {
switch (codePage) {
case 932:
return ch == 0x80
|| (ch >= 0xA0 && ch <= 0xDF)
|| (ch >= 0xFD);
default:
return false;
}
}
}
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