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/*
* wchar_t helpers
*/
typedef uint16_t cffi_char16_t;
typedef uint32_t cffi_char32_t;
#if Py_UNICODE_SIZE == 2
/* Before Python 2.7, PyUnicode_FromWideChar is not able to convert
wchar_t values greater than 65535 into two-unicode-characters surrogates.
But even the Python 2.7 version doesn't detect wchar_t values that are
out of range(1114112), and just returns nonsense.
From cffi 1.11 we can't use it anyway, because we need a version
with char32_t input types.
*/
static PyObject *
_my_PyUnicode_FromChar32(const cffi_char32_t *w, Py_ssize_t size)
{
PyObject *unicode;
Py_ssize_t i;
Py_ssize_t alloc;
const cffi_char32_t *orig_w;
alloc = size;
orig_w = w;
for (i = size; i > 0; i--) {
if (*w > 0xFFFF)
alloc++;
w++;
}
w = orig_w;
unicode = PyUnicode_FromUnicode(NULL, alloc);
if (!unicode)
return NULL;
/* Copy the wchar_t data into the new object */
{
Py_UNICODE *u;
u = PyUnicode_AS_UNICODE(unicode);
for (i = size; i > 0; i--) {
if (*w > 0xFFFF) {
cffi_char32_t ordinal;
if (*w > 0x10FFFF) {
PyErr_Format(PyExc_ValueError,
"char32_t out of range for "
"conversion to unicode: 0x%x", (int)*w);
Py_DECREF(unicode);
return NULL;
}
ordinal = *w++;
ordinal -= 0x10000;
*u++ = 0xD800 | (ordinal >> 10);
*u++ = 0xDC00 | (ordinal & 0x3FF);
}
else
*u++ = *w++;
}
}
return unicode;
}
static PyObject *
_my_PyUnicode_FromChar16(const cffi_char16_t *w, Py_ssize_t size)
{
return PyUnicode_FromUnicode((const Py_UNICODE *)w, size);
}
#else /* Py_UNICODE_SIZE == 4 */
static PyObject *
_my_PyUnicode_FromChar32(const cffi_char32_t *w, Py_ssize_t size)
{
return PyUnicode_FromUnicode((const Py_UNICODE *)w, size);
}
static PyObject *
_my_PyUnicode_FromChar16(const cffi_char16_t *w, Py_ssize_t size)
{
/* 'size' is the length of the 'w' array */
PyObject *result = PyUnicode_FromUnicode(NULL, size);
if (result != NULL) {
Py_UNICODE *u_base = PyUnicode_AS_UNICODE(result);
Py_UNICODE *u = u_base;
if (size == 1) { /* performance only */
*u = (cffi_char32_t)*w;
}
else {
while (size > 0) {
cffi_char32_t ch = *w++;
size--;
if (0xD800 <= ch && ch <= 0xDBFF && size > 0) {
cffi_char32_t ch2 = *w;
if (0xDC00 <= ch2 && ch2 <= 0xDFFF) {
ch = (((ch & 0x3FF)<<10) | (ch2 & 0x3FF)) + 0x10000;
w++;
size--;
}
}
*u++ = ch;
}
if (PyUnicode_Resize(&result, u - u_base) < 0) {
Py_DECREF(result);
return NULL;
}
}
}
return result;
}
#endif
#define IS_SURROGATE(u) (0xD800 <= (u)[0] && (u)[0] <= 0xDBFF && \
0xDC00 <= (u)[1] && (u)[1] <= 0xDFFF)
#define AS_SURROGATE(u) (0x10000 + (((u)[0] - 0xD800) << 10) + \
((u)[1] - 0xDC00))
static int
_my_PyUnicode_AsSingleChar16(PyObject *unicode, cffi_char16_t *result,
char *err_got)
{
Py_UNICODE *u = PyUnicode_AS_UNICODE(unicode);
if (PyUnicode_GET_SIZE(unicode) != 1) {
sprintf(err_got, "unicode string of length %zd",
PyUnicode_GET_SIZE(unicode));
return -1;
}
#if Py_UNICODE_SIZE == 4
if (((unsigned int)u[0]) > 0xFFFF)
{
sprintf(err_got, "larger-than-0xFFFF character");
return -1;
}
#endif
*result = (cffi_char16_t)u[0];
return 0;
}
static int
_my_PyUnicode_AsSingleChar32(PyObject *unicode, cffi_char32_t *result,
char *err_got)
{
Py_UNICODE *u = PyUnicode_AS_UNICODE(unicode);
if (PyUnicode_GET_SIZE(unicode) == 1) {
*result = (cffi_char32_t)u[0];
return 0;
}
#if Py_UNICODE_SIZE == 2
if (PyUnicode_GET_SIZE(unicode) == 2 && IS_SURROGATE(u)) {
*result = AS_SURROGATE(u);
return 0;
}
#endif
sprintf(err_got, "unicode string of length %zd",
PyUnicode_GET_SIZE(unicode));
return -1;
}
static Py_ssize_t _my_PyUnicode_SizeAsChar16(PyObject *unicode)
{
Py_ssize_t length = PyUnicode_GET_SIZE(unicode);
Py_ssize_t result = length;
#if Py_UNICODE_SIZE == 4
Py_UNICODE *u = PyUnicode_AS_UNICODE(unicode);
Py_ssize_t i;
for (i=0; i<length; i++) {
if (u[i] > 0xFFFF)
result++;
}
#endif
return result;
}
static Py_ssize_t _my_PyUnicode_SizeAsChar32(PyObject *unicode)
{
Py_ssize_t length = PyUnicode_GET_SIZE(unicode);
Py_ssize_t result = length;
#if Py_UNICODE_SIZE == 2
Py_UNICODE *u = PyUnicode_AS_UNICODE(unicode);
Py_ssize_t i;
for (i=0; i<length-1; i++) {
if (IS_SURROGATE(u+i))
result--;
}
#endif
return result;
}
static int _my_PyUnicode_AsChar16(PyObject *unicode,
cffi_char16_t *result,
Py_ssize_t resultlen)
{
Py_ssize_t len = PyUnicode_GET_SIZE(unicode);
Py_UNICODE *u = PyUnicode_AS_UNICODE(unicode);
Py_ssize_t i;
for (i=0; i<len; i++) {
#if Py_UNICODE_SIZE == 2
cffi_char16_t ordinal = u[i];
#else
cffi_char32_t ordinal = u[i];
if (ordinal > 0xFFFF) {
if (ordinal > 0x10FFFF) {
PyErr_Format(PyExc_ValueError,
"unicode character out of range for "
"conversion to char16_t: 0x%x", (int)ordinal);
return -1;
}
ordinal -= 0x10000;
*result++ = 0xD800 | (ordinal >> 10);
*result++ = 0xDC00 | (ordinal & 0x3FF);
continue;
}
#endif
*result++ = ordinal;
}
return 0;
}
static int _my_PyUnicode_AsChar32(PyObject *unicode,
cffi_char32_t *result,
Py_ssize_t resultlen)
{
Py_UNICODE *u = PyUnicode_AS_UNICODE(unicode);
Py_ssize_t i;
for (i=0; i<resultlen; i++) {
cffi_char32_t ordinal = *u;
#if Py_UNICODE_SIZE == 2
if (IS_SURROGATE(u)) {
ordinal = AS_SURROGATE(u);
u++;
}
#endif
result[i] = ordinal;
u++;
}
return 0;
}
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