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// Scintilla source code edit control
/** @file UniConversion.cxx
** Functions to handle UFT-8 and UCS-2 strings.
**/
// Copyright 1998-2001 by Neil Hodgson <[email protected]>
// The License.txt file describes the conditions under which this software may be distributed.
#include <stdlib.h>
#include "UniConversion.h"
unsigned int UTF8Length(const wchar_t *uptr, unsigned int tlen) {
unsigned int len = 0;
for (unsigned int i = 0; i < tlen && uptr[i]; i++) {
unsigned int uch = uptr[i];
if (uch < 0x80)
len++;
else if (uch < 0x800)
len += 2;
else
len +=3;
}
return len;
}
void UTF8FromUCS2(const wchar_t *uptr, unsigned int tlen, char *putf, unsigned int len) {
int k = 0;
for (unsigned int i = 0; i < tlen && uptr[i]; i++) {
unsigned int uch = uptr[i];
if (uch < 0x80) {
putf[k++] = static_cast<char>(uch);
} else if (uch < 0x800) {
putf[k++] = static_cast<char>(0xC0 | (uch >> 6));
putf[k++] = static_cast<char>(0x80 | (uch & 0x3f));
} else {
putf[k++] = static_cast<char>(0xE0 | (uch >> 12));
putf[k++] = static_cast<char>(0x80 | ((uch >> 6) & 0x3f));
putf[k++] = static_cast<char>(0x80 | (uch & 0x3f));
}
}
putf[len] = '\0';
}
unsigned int UCS2Length(const char *s, unsigned int len) {
unsigned int ulen = 0;
for (unsigned int i=0;i<len;i++) {
unsigned char ch = static_cast<unsigned char>(s[i]);
if ((ch < 0x80) || (ch > (0x80 + 0x40)))
ulen++;
}
return ulen;
}
unsigned int UCS2FromUTF8(const char *s, unsigned int len, wchar_t *tbuf, unsigned int tlen) {
unsigned int ui=0;
const unsigned char *us = reinterpret_cast<const unsigned char *>(s);
unsigned int i=0;
while ((i<len) && (ui<tlen)) {
unsigned char ch = us[i++];
if (ch < 0x80) {
tbuf[ui] = ch;
} else if (ch < 0x80 + 0x40 + 0x20) {
tbuf[ui] = static_cast<wchar_t>((ch & 0x1F) << 6);
ch = us[i++];
tbuf[ui] = static_cast<wchar_t>(tbuf[ui] + (ch & 0x7F));
} else {
tbuf[ui] = static_cast<wchar_t>((ch & 0xF) << 12);
ch = us[i++];
tbuf[ui] = static_cast<wchar_t>(tbuf[ui] + ((ch & 0x7F) << 6));
ch = us[i++];
tbuf[ui] = static_cast<wchar_t>(tbuf[ui] + (ch & 0x7F));
}
ui++;
}
return ui;
}
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