barrier/base/CUnicode.cpp

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#include "CUnicode.h"
#include <string.h>
//
// local utility functions
//
inline
static
UInt16
decode16(const UInt8* n)
{
union x16 {
UInt8 n8[2];
UInt16 n16;
} c;
c.n8[0] = n[0];
c.n8[1] = n[1];
return c.n16;
}
inline
static
UInt32
decode32(const UInt8* n)
{
union x32 {
UInt8 n8[4];
UInt32 n32;
} c;
c.n8[0] = n[0];
c.n8[1] = n[1];
c.n8[2] = n[2];
c.n8[3] = n[3];
return c.n32;
}
//
// CUnicode
//
UInt32 CUnicode::s_invalid = 0x0000ffff;
CString
CUnicode::UTF8ToUCS2(const CString& src)
{
// get size of input string and reserve some space in output.
// include UTF8's nul terminator.
UInt32 n = src.size() + 1;
CString dst;
dst.reserve(2 * n);
// convert each character
const UInt8* data = reinterpret_cast<const UInt8*>(src.c_str());
while (n > 0) {
UInt32 c = fromUTF8(data, n);
if (c != s_invalid && c < 0x0000ffff) {
UInt16 ucs2 = static_cast<UInt16>(c);
dst.append(reinterpret_cast<const char*>(&ucs2), 2);
}
}
return dst;
}
CString
CUnicode::UTF8ToUCS4(const CString& src)
{
// get size of input string and reserve some space in output.
// include UTF8's nul terminator.
UInt32 n = src.size() + 1;
CString dst;
dst.reserve(4 * n);
// convert each character
const UInt8* data = reinterpret_cast<const UInt8*>(src.c_str());
while (n > 0) {
UInt32 c = fromUTF8(data, n);
if (c != s_invalid) {
dst.append(reinterpret_cast<const char*>(&c), 4);
}
}
return dst;
}
CString
CUnicode::UTF8ToUTF16(const CString& src)
{
// get size of input string and reserve some space in output.
// include UTF8's nul terminator.
UInt32 n = src.size() + 1;
CString dst;
dst.reserve(2 * n);
// convert each character
const UInt8* data = reinterpret_cast<const UInt8*>(src.c_str());
while (n > 0) {
UInt32 c = fromUTF8(data, n);
if (c != s_invalid && c < 0x0010ffff) {
if (c < 0x00010000) {
UInt16 ucs2 = static_cast<UInt16>(c);
dst.append(reinterpret_cast<const char*>(&ucs2), 2);
}
else {
c -= 0x00010000;
UInt16 utf16h = static_cast<UInt16>(c >> 10) + 0xd800;
UInt16 utf16l = (static_cast<UInt16>(c) & 0x03ff) + 0xdc00;
dst.append(reinterpret_cast<const char*>(&utf16h), 2);
dst.append(reinterpret_cast<const char*>(&utf16l), 2);
}
}
}
return dst;
}
CString
CUnicode::UTF8ToUTF32(const CString& src)
{
// FIXME -- should ensure dst has no characters over U-0010FFFF
return UTF8ToUCS4(src);
}
CString
CUnicode::UCS2ToUTF8(const CString& src)
{
UInt32 n = src.size() >> 1;
return doUCS2ToUTF8(reinterpret_cast<const UInt8*>(src.data()), n);
}
CString
CUnicode::UCS4ToUTF8(const CString& src)
{
UInt32 n = src.size() >> 2;
return doUCS4ToUTF8(reinterpret_cast<const UInt8*>(src.data()), n);
}
CString
CUnicode::UTF16ToUTF8(const CString& src)
{
UInt32 n = src.size() >> 1;
return doUTF16ToUTF8(reinterpret_cast<const UInt8*>(src.data()), n);
}
CString
CUnicode::UTF32ToUTF8(const CString& src)
{
UInt32 n = src.size() >> 2;
return doUTF32ToUTF8(reinterpret_cast<const UInt8*>(src.data()), n);
}
CString
CUnicode::UTF8ToText(const CString& src)
{
// convert to wide char
wchar_t* tmp = UTF8ToWideChar(src);
// get length of multibyte string
mbstate_t state;
memset(&state, 0, sizeof(state));
const wchar_t* scratch = tmp;
size_t len = wcsrtombs(NULL, &scratch, 0, &state);
if (len == (size_t)-1) {
// invalid character in src
delete[] tmp;
return CString();
}
// convert to multibyte
scratch = tmp;
char* dst = new char[len + 1];
wcsrtombs(dst, &scratch, len + 1, &state);
CString text(dst);
// clean up
delete[] dst;
delete[] tmp;
return text;
}
CString
CUnicode::textToUTF8(const CString& src)
{
// get length of wide char string
mbstate_t state;
memset(&state, 0, sizeof(state));
const char* scratch = src.c_str();
size_t len = mbsrtowcs(NULL, &scratch, 0, &state);
if (len == (size_t)-1) {
// invalid character in src
return CString();
}
// convert multibyte to wide char
scratch = src.c_str();
wchar_t* dst = new wchar_t[len + 1];
mbsrtowcs(dst, &scratch, len + 1, &state);
// convert to UTF8
CString utf8 = wideCharToUTF8(dst);
// clean up
delete[] dst;
return utf8;
}
wchar_t*
CUnicode::UTF8ToWideChar(const CString& src)
{
// convert to platform's wide character encoding.
// note -- this must include a wide nul character (independent of
// the CString's nul character).
#if WINDOWS_LIKE
CString tmp = UTF8ToUCS16(src);
UInt32 size = tmp.size() >> 1;
#elif UNIX_LIKE
CString tmp = UTF8ToUCS4(src);
UInt32 size = tmp.size() >> 2;
#endif
// copy to a wchar_t array
wchar_t* dst = new wchar_t[size];
::memcpy(dst, src.data(), sizeof(wchar_t) * size);
return dst;
}
CString
CUnicode::wideCharToUTF8(const wchar_t* src)
{
// convert from platform's wide character encoding.
// note -- this must include a wide nul character (independent of
// the CString's nul character).
#if WINDOWS_LIKE
return doUCS16ToUTF8(reinterpret_cast<const UInt8*>(src), wcslen(src));
#elif UNIX_LIKE
return doUCS4ToUTF8(reinterpret_cast<const UInt8*>(src), wcslen(src));
#endif
}
CString
CUnicode::doUCS2ToUTF8(const UInt8* data, UInt32 n)
{
// make some space
CString dst;
dst.reserve(n);
// convert each character
for (; n > 0; data += 2, --n) {
UInt32 c = decode16(data);
toUTF8(dst, c);
}
// remove extra trailing nul
if (dst.size() > 0 && dst[dst.size() - 1] == '\0') {
dst.resize(dst.size() - 1);
}
return dst;
}
CString
CUnicode::doUCS4ToUTF8(const UInt8* data, UInt32 n)
{
// make some space
CString dst;
dst.reserve(n);
// convert each character
for (; n > 0; data += 4, --n) {
UInt32 c = decode32(data);
toUTF8(dst, c);
}
// remove extra trailing nul
if (dst.size() > 0 && dst[dst.size() - 1] == '\0') {
dst.resize(dst.size() - 1);
}
return dst;
}
CString
CUnicode::doUTF16ToUTF8(const UInt8* data, UInt32 n)
{
// make some space
CString dst;
dst.reserve(n);
// convert each character
for (; n > 0; data += 2, --n) {
UInt32 c = decode16(data);
if (c < 0x0000d800 || c > 0x0000dfff) {
toUTF8(dst, c);
}
else if (n == 1) {
// error -- missing second word
}
else if (c >= 0x0000d800 && c <= 0x0000dbff) {
UInt32 c2 = decode16(data);
data += 2;
--n;
if (c2 < 0x0000dc00 || c2 > 0x0000dfff) {
// error -- [d800,dbff] not followed by [dc00,dfff]
}
else {
c = (((c - 0x0000d800) << 10) | (c2 - 0x0000dc00)) + 0x00010000;
toUTF8(dst, c);
}
}
else {
// error -- [dc00,dfff] without leading [d800,dbff]
}
}
// remove extra trailing nul
if (dst.size() > 0 && dst[dst.size() - 1] == '\0') {
dst.resize(dst.size() - 1);
}
return dst;
}
CString
CUnicode::doUTF32ToUTF8(const UInt8* data, UInt32 n)
{
// FIXME -- should check that src has no characters over U-0010FFFF
return doUCS4ToUTF8(data, n);
}
UInt32
CUnicode::fromUTF8(const UInt8*& data, UInt32& n)
{
assert(data != NULL);
assert(n != 0);
// compute character encoding length, checking for overlong
// sequences (i.e. characters that don't use the shortest
// possible encoding).
UInt32 size;
if (data[0] < 0x80) {
// 0xxxxxxx
size = 1;
}
else if (data[0] < 0xc0) {
// 10xxxxxx -- in the middle of a multibyte character. skip
// until we find a start byte and return error.
do {
--n;
++data;
} while (n > 0 && (data[0] & 0xc0) == 0x80);
return s_invalid;
}
else if (data[0] < 0xe0) {
// 110xxxxx
size = 2;
}
else if (data[0] < 0xf0) {
// 1110xxxx
size = 3;
}
else if (data[0] < 0xf8) {
// 11110xxx
size = 4;
}
else if (data[0] < 0xfc) {
// 111110xx
size = 5;
}
else if (data[0] < 0xfe) {
// 1111110x
size = 6;
}
else {
// invalid sequence. dunno how many bytes to skip so skip one.
--n;
++data;
return s_invalid;
}
// make sure we have enough data
if (size > n) {
data += n;
n = 0;
return s_invalid;
}
// extract character
UInt32 c;
switch (size) {
case 1:
c = static_cast<UInt32>(data[0]);
break;
case 2:
c = ((static_cast<UInt32>(data[0]) & 0x1f) << 6) |
((static_cast<UInt32>(data[1]) & 0x3f) );
break;
case 3:
c = ((static_cast<UInt32>(data[0]) & 0x0f) << 12) |
((static_cast<UInt32>(data[1]) & 0x3f) << 6) |
((static_cast<UInt32>(data[2]) & 0x3f) );
break;
case 4:
c = ((static_cast<UInt32>(data[0]) & 0x07) << 18) |
((static_cast<UInt32>(data[1]) & 0x3f) << 12) |
((static_cast<UInt32>(data[1]) & 0x3f) << 6) |
((static_cast<UInt32>(data[1]) & 0x3f) );
break;
case 5:
c = ((static_cast<UInt32>(data[0]) & 0x03) << 24) |
((static_cast<UInt32>(data[1]) & 0x3f) << 18) |
((static_cast<UInt32>(data[1]) & 0x3f) << 12) |
((static_cast<UInt32>(data[1]) & 0x3f) << 6) |
((static_cast<UInt32>(data[1]) & 0x3f) );
break;
case 6:
c = ((static_cast<UInt32>(data[0]) & 0x01) << 30) |
((static_cast<UInt32>(data[1]) & 0x3f) << 24) |
((static_cast<UInt32>(data[1]) & 0x3f) << 18) |
((static_cast<UInt32>(data[1]) & 0x3f) << 12) |
((static_cast<UInt32>(data[1]) & 0x3f) << 6) |
((static_cast<UInt32>(data[1]) & 0x3f) );
break;
default:
assert(0 && "invalid size");
}
// update parameters
data += size;
n -= size;
// check for characters that didn't use the smallest possible encoding
static UInt32 s_minChar[] = {
0,
0x00000000,
0x00000080,
0x00000800,
0x00010000,
0x00200000,
0x04000000
};
if (c < s_minChar[size]) {
return s_invalid;
}
// check that all bytes after the first have the pattern 10xxxxxx.
UInt8 a = 0x80;
switch (size) {
case 6:
a |= data[5];
// fall through
case 5:
a |= data[4];
// fall through
case 4:
a |= data[3];
// fall through
case 3:
a |= data[2];
// fall through
case 2:
a |= data[1];
}
if ((a & 0xc0) != 0x80) {
return s_invalid;
}
return c;
}
void
CUnicode::toUTF8(CString& dst, const UInt32 c)
{
UInt8 data[6];
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 {
// invalid character
}
}