77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
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// Scintilla source code edit control
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/** @file UniConversion.cxx
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** Functions to handle UFT-8 and UCS-2 strings.
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**/
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// Copyright 1998-2001 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 <stdlib.h>
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#include "UniConversion.h"
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unsigned int UTF8Length(const wchar_t *uptr, unsigned int tlen) {
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unsigned int len = 0;
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for (unsigned int i = 0; i < tlen && uptr[i]; i++) {
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unsigned int uch = uptr[i];
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if (uch < 0x80)
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len++;
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else if (uch < 0x800)
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len += 2;
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else
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len +=3;
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}
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return len;
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}
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void UTF8FromUCS2(const wchar_t *uptr, unsigned int tlen, char *putf, unsigned int len) {
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int k = 0;
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for (unsigned int i = 0; i < tlen && uptr[i]; i++) {
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unsigned int uch = uptr[i];
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if (uch < 0x80) {
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putf[k++] = static_cast<char>(uch);
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} else if (uch < 0x800) {
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putf[k++] = static_cast<char>(0xC0 | (uch >> 6));
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putf[k++] = static_cast<char>(0x80 | (uch & 0x3f));
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} else {
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putf[k++] = static_cast<char>(0xE0 | (uch >> 12));
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putf[k++] = static_cast<char>(0x80 | ((uch >> 6) & 0x3f));
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putf[k++] = static_cast<char>(0x80 | (uch & 0x3f));
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}
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}
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putf[len] = '\0';
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}
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unsigned int UCS2Length(const char *s, unsigned int len) {
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unsigned int ulen = 0;
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for (unsigned int i=0;i<len;i++) {
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unsigned char ch = static_cast<unsigned char>(s[i]);
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if ((ch < 0x80) || (ch > (0x80 + 0x40)))
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ulen++;
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}
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return ulen;
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}
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unsigned int UCS2FromUTF8(const char *s, unsigned int len, wchar_t *tbuf, unsigned int tlen) {
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unsigned int ui=0;
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const unsigned char *us = reinterpret_cast<const unsigned char *>(s);
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unsigned int i=0;
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while ((i<len) && (ui<tlen)) {
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unsigned char ch = us[i++];
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if (ch < 0x80) {
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tbuf[ui] = ch;
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} else if (ch < 0x80 + 0x40 + 0x20) {
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tbuf[ui] = static_cast<wchar_t>((ch & 0x1F) << 6);
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ch = us[i++];
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tbuf[ui] = static_cast<wchar_t>(tbuf[ui] + (ch & 0x7F));
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} else {
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tbuf[ui] = static_cast<wchar_t>((ch & 0xF) << 12);
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ch = us[i++];
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tbuf[ui] = static_cast<wchar_t>(tbuf[ui] + ((ch & 0x7F) << 6));
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ch = us[i++];
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tbuf[ui] = static_cast<wchar_t>(tbuf[ui] + (ch & 0x7F));
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}
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ui++;
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}
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return ui;
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}
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