264 lines
7.1 KiB
C++
264 lines
7.1 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 UTF-8 and UTF-16 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 "UniConversion.h"
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#ifdef SCI_NAMESPACE
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using namespace Scintilla;
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#endif
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#ifdef SCI_NAMESPACE
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namespace Scintilla {
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#endif
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enum { SURROGATE_LEAD_FIRST = 0xD800 };
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enum { SURROGATE_TRAIL_FIRST = 0xDC00 };
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enum { SURROGATE_TRAIL_LAST = 0xDFFF };
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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];) {
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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 if ((uch >= SURROGATE_LEAD_FIRST) &&
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(uch <= SURROGATE_TRAIL_LAST)) {
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len += 4;
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i++;
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} else {
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len += 3;
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}
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i++;
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}
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return len;
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}
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void UTF8FromUTF16(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];) {
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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 if ((uch >= SURROGATE_LEAD_FIRST) &&
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(uch <= SURROGATE_TRAIL_LAST)) {
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// Half a surrogate pair
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i++;
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unsigned int xch = 0x10000 + ((uch & 0x3ff) << 10) + (uptr[i] & 0x3ff);
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putf[k++] = static_cast<char>(0xF0 | (xch >> 18));
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putf[k++] = static_cast<char>(0x80 | ((xch >> 12) & 0x3f));
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putf[k++] = static_cast<char>(0x80 | ((xch >> 6) & 0x3f));
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putf[k++] = static_cast<char>(0x80 | (xch & 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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i++;
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}
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putf[len] = '\0';
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}
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unsigned int UTF8CharLength(unsigned char ch) {
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if (ch < 0x80) {
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return 1;
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} else if (ch < 0x80 + 0x40 + 0x20) {
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return 2;
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} else if (ch < 0x80 + 0x40 + 0x20 + 0x10) {
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return 3;
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} else {
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return 4;
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}
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}
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unsigned int UTF16Length(const char *s, unsigned int len) {
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unsigned int ulen = 0;
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unsigned int charLen;
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for (unsigned int i=0; i<len;) {
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unsigned char ch = static_cast<unsigned char>(s[i]);
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if (ch < 0x80) {
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charLen = 1;
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} else if (ch < 0x80 + 0x40 + 0x20) {
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charLen = 2;
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} else if (ch < 0x80 + 0x40 + 0x20 + 0x10) {
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charLen = 3;
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} else {
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charLen = 4;
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ulen++;
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}
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i += charLen;
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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 UTF16FromUTF8(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 if (ch < 0x80 + 0x40 + 0x20 + 0x10) {
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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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} else {
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// Outside the BMP so need two surrogates
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int val = (ch & 0x7) << 18;
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ch = us[i++];
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val += (ch & 0x3F) << 12;
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ch = us[i++];
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val += (ch & 0x3F) << 6;
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ch = us[i++];
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val += (ch & 0x3F);
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tbuf[ui] = static_cast<wchar_t>(((val - 0x10000) >> 10) + SURROGATE_LEAD_FIRST);
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ui++;
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tbuf[ui] = static_cast<wchar_t>((val & 0x3ff) + SURROGATE_TRAIL_FIRST);
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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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int UTF8BytesOfLead[256];
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static bool initialisedBytesOfLead = false;
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static int BytesFromLead(int leadByte) {
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if (leadByte < 0xC2) {
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// Single byte or invalid
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return 1;
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} else if (leadByte < 0xE0) {
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return 2;
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} else if (leadByte < 0xF0) {
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return 3;
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} else if (leadByte < 0xF5) {
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return 4;
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} else {
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// Characters longer than 4 bytes not possible in current UTF-8
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return 1;
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}
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}
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void UTF8BytesOfLeadInitialise() {
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if (!initialisedBytesOfLead) {
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for (int i=0;i<256;i++) {
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UTF8BytesOfLead[i] = BytesFromLead(i);
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}
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initialisedBytesOfLead = true;
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}
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}
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// Return both the width of the first character in the string and a status
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// saying whether it is valid or invalid.
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// Most invalid sequences return a width of 1 so are treated as isolated bytes but
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// the non-characters *FFFE, *FFFF and FDD0 .. FDEF return 3 or 4 as they can be
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// reasonably treated as code points in some circumstances. They will, however,
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// not have associated glyphs.
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int UTF8Classify(const unsigned char *us, int len) {
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// For the rules: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
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if (*us < 0x80) {
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// Single bytes easy
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return 1;
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} else if (*us > 0xf4) {
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// Characters longer than 4 bytes not possible in current UTF-8
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return UTF8MaskInvalid | 1;
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} else if (*us >= 0xf0) {
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// 4 bytes
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if (len < 4)
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return UTF8MaskInvalid | 1;
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if (UTF8IsTrailByte(us[1]) && UTF8IsTrailByte(us[2]) && UTF8IsTrailByte(us[3])) {
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if (((us[1] & 0xf) == 0xf) && (us[2] == 0xbf) && ((us[3] == 0xbe) || (us[3] == 0xbf))) {
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// *FFFE or *FFFF non-character
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return UTF8MaskInvalid | 4;
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}
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if (*us == 0xf4) {
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// Check if encoding a value beyond the last Unicode character 10FFFF
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if (us[1] > 0x8f) {
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return UTF8MaskInvalid | 1;
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} else if (us[1] == 0x8f) {
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if (us[2] > 0xbf) {
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return UTF8MaskInvalid | 1;
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} else if (us[2] == 0xbf) {
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if (us[3] > 0xbf) {
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return UTF8MaskInvalid | 1;
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}
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}
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}
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} else if ((*us == 0xf0) && ((us[1] & 0xf0) == 0x80)) {
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// Overlong
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return UTF8MaskInvalid | 1;
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}
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return 4;
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} else {
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return UTF8MaskInvalid | 1;
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}
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} else if (*us >= 0xe0) {
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// 3 bytes
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if (len < 3)
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return UTF8MaskInvalid | 1;
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if (UTF8IsTrailByte(us[1]) && UTF8IsTrailByte(us[2])) {
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if ((*us == 0xe0) && ((us[1] & 0xe0) == 0x80)) {
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// Overlong
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return UTF8MaskInvalid | 1;
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}
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if ((*us == 0xed) && ((us[1] & 0xe0) == 0xa0)) {
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// Surrogate
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return UTF8MaskInvalid | 1;
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}
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if ((*us == 0xef) && (us[1] == 0xbf) && (us[2] == 0xbe)) {
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// U+FFFE non-character - 3 bytes long
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return UTF8MaskInvalid | 3;
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}
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if ((*us == 0xef) && (us[1] == 0xbf) && (us[2] == 0xbf)) {
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// U+FFFF non-character - 3 bytes long
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return UTF8MaskInvalid | 3;
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}
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if ((*us == 0xef) && (us[1] == 0xb7) && (((us[2] & 0xf0) == 0x90) || ((us[2] & 0xf0) == 0xa0))) {
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// U+FDD0 .. U+FDEF
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return UTF8MaskInvalid | 3;
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}
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return 3;
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} else {
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return UTF8MaskInvalid | 1;
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}
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} else if (*us >= 0xc2) {
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// 2 bytes
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if (len < 2)
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return UTF8MaskInvalid | 1;
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if (UTF8IsTrailByte(us[1])) {
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return 2;
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} else {
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return UTF8MaskInvalid | 1;
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}
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} else {
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// 0xc0 .. 0xc1 is overlong encoding
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// 0x80 .. 0xbf is trail byte
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return UTF8MaskInvalid | 1;
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}
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}
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int UTF8DrawBytes(const unsigned char *us, int len) {
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int utf8StatusNext = UTF8Classify(us, len);
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return (utf8StatusNext & UTF8MaskInvalid) ? 1 : (utf8StatusNext & UTF8MaskWidth);
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}
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#ifdef SCI_NAMESPACE
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}
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#endif
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