627 lines
13 KiB
C++
627 lines
13 KiB
C++
#include "CUnicode.h"
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#include <limits.h>
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#include <string.h>
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//
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// local utility functions
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//
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inline
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static
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UInt16
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decode16(const UInt8* n)
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{
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union x16 {
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UInt8 n8[2];
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UInt16 n16;
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} c;
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c.n8[0] = n[0];
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c.n8[1] = n[1];
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return c.n16;
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}
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inline
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static
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UInt32
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decode32(const UInt8* n)
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{
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union x32 {
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UInt8 n8[4];
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UInt32 n32;
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} c;
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c.n8[0] = n[0];
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c.n8[1] = n[1];
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c.n8[2] = n[2];
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c.n8[3] = n[3];
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return c.n32;
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}
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//
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// CUnicode
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//
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UInt32 CUnicode::s_invalid = 0x0000ffff;
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UInt32 CUnicode::s_replacement = 0x0000fffd;
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CString
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CUnicode::UTF8ToUCS2(const CString& src)
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{
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// get size of input string and reserve some space in output.
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// include UTF8's nul terminator.
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UInt32 n = src.size() + 1;
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CString dst;
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dst.reserve(2 * n);
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// convert each character
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const UInt8* data = reinterpret_cast<const UInt8*>(src.c_str());
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while (n > 0) {
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UInt32 c = fromUTF8(data, n);
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if (c == s_invalid || c >= 0x00010000) {
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c = s_replacement;
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}
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UInt16 ucs2 = static_cast<UInt16>(c);
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dst.append(reinterpret_cast<const char*>(&ucs2), 2);
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}
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return dst;
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}
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CString
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CUnicode::UTF8ToUCS4(const CString& src)
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{
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// get size of input string and reserve some space in output.
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// include UTF8's nul terminator.
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UInt32 n = src.size() + 1;
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CString dst;
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dst.reserve(4 * n);
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// convert each character
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const UInt8* data = reinterpret_cast<const UInt8*>(src.c_str());
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while (n > 0) {
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UInt32 c = fromUTF8(data, n);
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if (c == s_invalid) {
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c = s_replacement;
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}
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dst.append(reinterpret_cast<const char*>(&c), 4);
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}
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return dst;
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}
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CString
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CUnicode::UTF8ToUTF16(const CString& src)
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{
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// get size of input string and reserve some space in output.
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// include UTF8's nul terminator.
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UInt32 n = src.size() + 1;
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CString dst;
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dst.reserve(2 * n);
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// convert each character
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const UInt8* data = reinterpret_cast<const UInt8*>(src.c_str());
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while (n > 0) {
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UInt32 c = fromUTF8(data, n);
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if (c == s_invalid || c >= 0x00110000) {
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c = s_replacement;
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}
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if (c < 0x00010000) {
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UInt16 ucs2 = static_cast<UInt16>(c);
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dst.append(reinterpret_cast<const char*>(&ucs2), 2);
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}
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else {
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c -= 0x00010000;
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UInt16 utf16h = static_cast<UInt16>(c >> 10) + 0xd800;
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UInt16 utf16l = (static_cast<UInt16>(c) & 0x03ff) + 0xdc00;
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dst.append(reinterpret_cast<const char*>(&utf16h), 2);
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dst.append(reinterpret_cast<const char*>(&utf16l), 2);
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}
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}
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return dst;
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}
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CString
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CUnicode::UTF8ToUTF32(const CString& src)
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{
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// get size of input string and reserve some space in output.
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// include UTF8's nul terminator.
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UInt32 n = src.size() + 1;
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CString dst;
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dst.reserve(4 * n);
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// convert each character
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const UInt8* data = reinterpret_cast<const UInt8*>(src.c_str());
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while (n > 0) {
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UInt32 c = fromUTF8(data, n);
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if (c == s_invalid || c >= 0x00110000) {
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c = s_replacement;
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}
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dst.append(reinterpret_cast<const char*>(&c), 4);
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}
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return dst;
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}
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CString
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CUnicode::UCS2ToUTF8(const CString& src)
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{
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UInt32 n = src.size() >> 1;
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return doUCS2ToUTF8(reinterpret_cast<const UInt8*>(src.data()), n);
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}
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CString
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CUnicode::UCS4ToUTF8(const CString& src)
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{
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UInt32 n = src.size() >> 2;
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return doUCS4ToUTF8(reinterpret_cast<const UInt8*>(src.data()), n);
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}
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CString
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CUnicode::UTF16ToUTF8(const CString& src)
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{
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UInt32 n = src.size() >> 1;
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return doUTF16ToUTF8(reinterpret_cast<const UInt8*>(src.data()), n);
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}
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CString
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CUnicode::UTF32ToUTF8(const CString& src)
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{
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UInt32 n = src.size() >> 2;
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return doUTF32ToUTF8(reinterpret_cast<const UInt8*>(src.data()), n);
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}
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CString
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CUnicode::UTF8ToText(const CString& src)
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{
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// convert to wide char
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wchar_t* tmp = UTF8ToWideChar(src);
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// get length of multibyte string
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size_t len = 0;
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char mbc[MB_LEN_MAX];
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mbstate_t state;
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memset(&state, 0, sizeof(state));
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for (const wchar_t* scan = tmp; *scan != 0; ++scan) {
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size_t mblen = wcrtomb(mbc, *scan, &state);
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if (mblen == -1) {
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// unconvertable character
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len += 1;
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}
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else {
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len += mblen;
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}
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}
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// check if state is in initial state. if not then count the
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// bytes for returning it to the initial state.
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if (mbsinit(&state) == 0) {
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len += wcrtomb(mbc, L'\0', &state) - 1;
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}
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assert(mbsinit(&state) != 0);
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// allocate multibyte string
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char* mbs = new char[len + 1];
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// convert to multibyte
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char* dst = mbs;
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for (const wchar_t* scan = tmp; *scan != 0; ++scan) {
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size_t mblen = wcrtomb(dst, *scan, &state);
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if (mblen == -1) {
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// unconvertable character
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*dst++ = '?';
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}
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else {
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dst += len;
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}
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}
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*dst = '\0';
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CString text(mbs);
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// clean up
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delete[] mbs;
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delete[] tmp;
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return text;
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}
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CString
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CUnicode::textToUTF8(const CString& src)
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{
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// get length of wide char string
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mbstate_t state;
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memset(&state, 0, sizeof(state));
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const char* scratch = src.c_str();
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size_t len = mbsrtowcs(NULL, &scratch, 0, &state);
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if (len == (size_t)-1) {
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// invalid character in src
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return CString();
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}
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// convert multibyte to wide char
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scratch = src.c_str();
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wchar_t* dst = new wchar_t[len + 1];
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mbsrtowcs(dst, &scratch, len + 1, &state);
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// convert to UTF8
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CString utf8 = wideCharToUTF8(dst);
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// clean up
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delete[] dst;
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return utf8;
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}
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wchar_t*
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CUnicode::UTF8ToWideChar(const CString& src)
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{
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// convert to platform's wide character encoding.
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// note -- this must include a wide nul character (independent of
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// the CString's nul character).
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#if WINDOWS_LIKE
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CString tmp = UTF8ToUCS16(src);
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UInt32 size = tmp.size() >> 1;
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#elif UNIX_LIKE
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CString tmp = UTF8ToUCS4(src);
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UInt32 size = tmp.size() >> 2;
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#endif
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// copy to a wchar_t array
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wchar_t* dst = new wchar_t[size];
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::memcpy(dst, tmp.data(), sizeof(wchar_t) * size);
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return dst;
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}
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CString
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CUnicode::wideCharToUTF8(const wchar_t* src)
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{
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// convert from platform's wide character encoding.
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// note -- this must include a wide nul character (independent of
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// the CString's nul character).
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#if WINDOWS_LIKE
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return doUCS16ToUTF8(reinterpret_cast<const UInt8*>(src), wcslen(src));
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#elif UNIX_LIKE
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return doUCS4ToUTF8(reinterpret_cast<const UInt8*>(src), wcslen(src));
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#endif
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}
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CString
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CUnicode::doUCS2ToUTF8(const UInt8* data, UInt32 n)
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{
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// make some space
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CString dst;
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dst.reserve(n);
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// convert each character
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for (; n > 0; data += 2, --n) {
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UInt32 c = decode16(data);
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toUTF8(dst, c);
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}
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// remove extra trailing nul
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if (dst.size() > 0 && dst[dst.size() - 1] == '\0') {
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dst.resize(dst.size() - 1);
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}
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return dst;
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}
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CString
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CUnicode::doUCS4ToUTF8(const UInt8* data, UInt32 n)
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{
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// make some space
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CString dst;
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dst.reserve(n);
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// convert each character
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for (; n > 0; data += 4, --n) {
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UInt32 c = decode32(data);
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toUTF8(dst, c);
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}
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// remove extra trailing nul
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if (dst.size() > 0 && dst[dst.size() - 1] == '\0') {
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dst.resize(dst.size() - 1);
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}
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return dst;
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}
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CString
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CUnicode::doUTF16ToUTF8(const UInt8* data, UInt32 n)
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{
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// make some space
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CString dst;
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dst.reserve(n);
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// convert each character
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for (; n > 0; data += 2, --n) {
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UInt32 c = decode16(data);
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if (c < 0x0000d800 || c > 0x0000dfff) {
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toUTF8(dst, c);
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}
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else if (n == 1) {
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// error -- missing second word
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toUTF8(dst, s_replacement);
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}
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else if (c >= 0x0000d800 && c <= 0x0000dbff) {
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UInt32 c2 = decode16(data);
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data += 2;
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--n;
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if (c2 < 0x0000dc00 || c2 > 0x0000dfff) {
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// error -- [d800,dbff] not followed by [dc00,dfff]
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toUTF8(dst, s_replacement);
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}
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else {
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c = (((c - 0x0000d800) << 10) | (c2 - 0x0000dc00)) + 0x00010000;
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toUTF8(dst, c);
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}
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}
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else {
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// error -- [dc00,dfff] without leading [d800,dbff]
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toUTF8(dst, s_replacement);
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}
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}
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// remove extra trailing nul
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if (dst.size() > 0 && dst[dst.size() - 1] == '\0') {
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dst.resize(dst.size() - 1);
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}
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return dst;
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}
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CString
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CUnicode::doUTF32ToUTF8(const UInt8* data, UInt32 n)
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{
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// make some space
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CString dst;
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dst.reserve(n);
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// convert each character
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for (; n > 0; data += 4, --n) {
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UInt32 c = decode32(data);
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if (c >= 0x00110000) {
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c = s_replacement;
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}
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toUTF8(dst, c);
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}
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// remove extra trailing nul
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if (dst.size() > 0 && dst[dst.size() - 1] == '\0') {
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dst.resize(dst.size() - 1);
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}
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return dst;
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}
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UInt32
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CUnicode::fromUTF8(const UInt8*& data, UInt32& n)
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{
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assert(data != NULL);
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assert(n != 0);
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// compute character encoding length, checking for overlong
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// sequences (i.e. characters that don't use the shortest
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// possible encoding).
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UInt32 size;
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if (data[0] < 0x80) {
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// 0xxxxxxx
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size = 1;
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}
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else if (data[0] < 0xc0) {
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// 10xxxxxx -- in the middle of a multibyte character. skip
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// until we find a start byte and return error.
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do {
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--n;
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++data;
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} while (n > 0 && (data[0] & 0xc0) == 0x80);
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return s_invalid;
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}
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else if (data[0] < 0xe0) {
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// 110xxxxx
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size = 2;
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}
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else if (data[0] < 0xf0) {
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// 1110xxxx
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size = 3;
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}
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else if (data[0] < 0xf8) {
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// 11110xxx
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size = 4;
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}
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else if (data[0] < 0xfc) {
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// 111110xx
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size = 5;
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}
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else if (data[0] < 0xfe) {
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// 1111110x
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size = 6;
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}
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else {
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// invalid sequence. dunno how many bytes to skip so skip one.
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--n;
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++data;
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return s_invalid;
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}
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// make sure we have enough data
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if (size > n) {
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data += n;
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n = 0;
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return s_invalid;
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}
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// extract character
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UInt32 c;
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switch (size) {
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case 1:
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c = static_cast<UInt32>(data[0]);
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break;
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case 2:
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c = ((static_cast<UInt32>(data[0]) & 0x1f) << 6) |
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((static_cast<UInt32>(data[1]) & 0x3f) );
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break;
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case 3:
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c = ((static_cast<UInt32>(data[0]) & 0x0f) << 12) |
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((static_cast<UInt32>(data[1]) & 0x3f) << 6) |
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((static_cast<UInt32>(data[2]) & 0x3f) );
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break;
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case 4:
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c = ((static_cast<UInt32>(data[0]) & 0x07) << 18) |
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((static_cast<UInt32>(data[1]) & 0x3f) << 12) |
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((static_cast<UInt32>(data[1]) & 0x3f) << 6) |
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((static_cast<UInt32>(data[1]) & 0x3f) );
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break;
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case 5:
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c = ((static_cast<UInt32>(data[0]) & 0x03) << 24) |
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((static_cast<UInt32>(data[1]) & 0x3f) << 18) |
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((static_cast<UInt32>(data[1]) & 0x3f) << 12) |
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((static_cast<UInt32>(data[1]) & 0x3f) << 6) |
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((static_cast<UInt32>(data[1]) & 0x3f) );
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break;
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case 6:
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c = ((static_cast<UInt32>(data[0]) & 0x01) << 30) |
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((static_cast<UInt32>(data[1]) & 0x3f) << 24) |
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((static_cast<UInt32>(data[1]) & 0x3f) << 18) |
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((static_cast<UInt32>(data[1]) & 0x3f) << 12) |
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((static_cast<UInt32>(data[1]) & 0x3f) << 6) |
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((static_cast<UInt32>(data[1]) & 0x3f) );
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break;
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default:
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assert(0 && "invalid size");
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}
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// check that all bytes after the first have the pattern 10xxxxxx.
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// truncated sequences are treated as a single malformed character.
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bool truncated = false;
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switch (size) {
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case 6:
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if ((data[5] & 0xc0) != 0x80) {
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truncated = true;
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size = 5;
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}
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// fall through
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case 5:
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if ((data[4] & 0xc0) != 0x80) {
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truncated = true;
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size = 4;
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}
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// fall through
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case 4:
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if ((data[3] & 0xc0) != 0x80) {
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truncated = true;
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size = 3;
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}
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// fall through
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case 3:
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if ((data[2] & 0xc0) != 0x80) {
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truncated = true;
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size = 2;
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}
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// fall through
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case 2:
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if ((data[1] & 0xc0) != 0x80) {
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truncated = true;
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size = 1;
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}
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}
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// update parameters
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data += size;
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n -= size;
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// invalid if sequence was truncated
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if (truncated) {
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return s_invalid;
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}
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// check for characters that didn't use the smallest possible encoding
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static UInt32 s_minChar[] = {
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0,
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0x00000000,
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0x00000080,
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0x00000800,
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0x00010000,
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0x00200000,
|
|
0x04000000
|
|
};
|
|
if (c < s_minChar[size]) {
|
|
return s_invalid;
|
|
}
|
|
|
|
// check for characters not in ISO-10646
|
|
if (c >= 0x0000d800 && c <= 0x0000dfff) {
|
|
return s_invalid;
|
|
}
|
|
if (c >= 0x0000fffe && c <= 0x0000ffff) {
|
|
return s_invalid;
|
|
}
|
|
|
|
return c;
|
|
}
|
|
|
|
void
|
|
CUnicode::toUTF8(CString& dst, UInt32 c)
|
|
{
|
|
UInt8 data[6];
|
|
|
|
// handle characters outside the valid range
|
|
if (c >= 0x80000000) {
|
|
c = s_replacement;
|
|
}
|
|
|
|
// convert to UTF-8
|
|
if (c < 0x00000080) {
|
|
data[0] = static_cast<UInt8>(c);
|
|
dst.append(reinterpret_cast<char*>(data), 1);
|
|
}
|
|
else if (c < 0x00000800) {
|
|
data[0] = static_cast<UInt8>((c >> 6) & 0x0000001f) + 0xc0;
|
|
data[1] = static_cast<UInt8>(c & 0x0000003f) + 0x80;
|
|
dst.append(reinterpret_cast<char*>(data), 2);
|
|
}
|
|
else if (c < 0x00010000) {
|
|
data[0] = static_cast<UInt8>((c >> 12) & 0x0000000f) + 0xe0;
|
|
data[1] = static_cast<UInt8>((c >> 6) & 0x0000003f) + 0x80;
|
|
data[2] = static_cast<UInt8>(c & 0x0000003f) + 0x80;
|
|
dst.append(reinterpret_cast<char*>(data), 3);
|
|
}
|
|
else if (c < 0x00200000) {
|
|
data[0] = static_cast<UInt8>((c >> 18) & 0x00000007) + 0xf0;
|
|
data[1] = static_cast<UInt8>((c >> 12) & 0x0000003f) + 0x80;
|
|
data[2] = static_cast<UInt8>((c >> 6) & 0x0000003f) + 0x80;
|
|
data[3] = static_cast<UInt8>(c & 0x0000003f) + 0x80;
|
|
dst.append(reinterpret_cast<char*>(data), 4);
|
|
}
|
|
else if (c < 0x04000000) {
|
|
data[0] = static_cast<UInt8>((c >> 24) & 0x00000003) + 0xf8;
|
|
data[1] = static_cast<UInt8>((c >> 18) & 0x0000003f) + 0x80;
|
|
data[2] = static_cast<UInt8>((c >> 12) & 0x0000003f) + 0x80;
|
|
data[3] = static_cast<UInt8>((c >> 6) & 0x0000003f) + 0x80;
|
|
data[4] = static_cast<UInt8>(c & 0x0000003f) + 0x80;
|
|
dst.append(reinterpret_cast<char*>(data), 5);
|
|
}
|
|
else if (c < 0x80000000) {
|
|
data[0] = static_cast<UInt8>((c >> 30) & 0x00000001) + 0xfc;
|
|
data[1] = static_cast<UInt8>((c >> 24) & 0x0000003f) + 0x80;
|
|
data[2] = static_cast<UInt8>((c >> 18) & 0x0000003f) + 0x80;
|
|
data[3] = static_cast<UInt8>((c >> 12) & 0x0000003f) + 0x80;
|
|
data[4] = static_cast<UInt8>((c >> 6) & 0x0000003f) + 0x80;
|
|
data[5] = static_cast<UInt8>(c & 0x0000003f) + 0x80;
|
|
dst.append(reinterpret_cast<char*>(data), 6);
|
|
}
|
|
else {
|
|
assert(0 && "character out of range");
|
|
}
|
|
}
|