diff options
Diffstat (limited to 'src/DBCS.cxx')
| -rw-r--r-- | src/DBCS.cxx | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/DBCS.cxx b/src/DBCS.cxx new file mode 100644 index 000000000..46cee8e69 --- /dev/null +++ b/src/DBCS.cxx @@ -0,0 +1,48 @@ +// 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" + +#ifdef SCI_NAMESPACE +using namespace Scintilla; +#endif + +#ifdef SCI_NAMESPACE +namespace Scintilla { +#endif + +bool DBCSIsLeadByte(int codePage, char ch) { + // Byte ranges found in Wikipedia articles with relevant search strings in each case + const unsigned char uch = static_cast<unsigned char>(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; +} + +#ifdef SCI_NAMESPACE +} +#endif |