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