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cpython/Objects/stringlib/codecs.h

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/* stringlib: codec implementations */
#if !STRINGLIB_IS_UNICODE
# error "codecs.h is specific to Unicode"
#endif
#include "pycore_bitutils.h" // _Py_bswap32()
/* Mask to quickly check whether a C 'size_t' contains a
non-ASCII, UTF8-encoded char. */
#if (SIZEOF_SIZE_T == 8)
# define ASCII_CHAR_MASK 0x8080808080808080ULL
#elif (SIZEOF_SIZE_T == 4)
# define ASCII_CHAR_MASK 0x80808080U
#else
# error C 'size_t' size should be either 4 or 8!
#endif
/* 10xxxxxx */
#define IS_CONTINUATION_BYTE(ch) ((ch) >= 0x80 && (ch) < 0xC0)
Py_LOCAL_INLINE(Py_UCS4)
STRINGLIB(utf8_decode)(const char **inptr, const char *end,
STRINGLIB_CHAR *dest,
Py_ssize_t *outpos)
{
Py_UCS4 ch;
const char *s = *inptr;
STRINGLIB_CHAR *p = dest + *outpos;
while (s < end) {
ch = (unsigned char)*s;
if (ch < 0x80) {
/* Fast path for runs of ASCII characters. Given that common UTF-8
input will consist of an overwhelming majority of ASCII
characters, we try to optimize for this case by checking
as many characters as a C 'size_t' can contain.
First, check if we can do an aligned read, as most CPUs have
a penalty for unaligned reads.
*/
if (_Py_IS_ALIGNED(s, ALIGNOF_SIZE_T)) {
/* Help register allocation */
const char *_s = s;
STRINGLIB_CHAR *_p = p;
while (_s + SIZEOF_SIZE_T <= end) {
/* Read a whole size_t at a time (either 4 or 8 bytes),
and do a fast unrolled copy if it only contains ASCII
characters. */
size_t value = *(const size_t *) _s;
if (value & ASCII_CHAR_MASK)
break;
#if PY_LITTLE_ENDIAN
_p[0] = (STRINGLIB_CHAR)(value & 0xFFu);
_p[1] = (STRINGLIB_CHAR)((value >> 8) & 0xFFu);
_p[2] = (STRINGLIB_CHAR)((value >> 16) & 0xFFu);
_p[3] = (STRINGLIB_CHAR)((value >> 24) & 0xFFu);
# if SIZEOF_SIZE_T == 8
_p[4] = (STRINGLIB_CHAR)((value >> 32) & 0xFFu);
_p[5] = (STRINGLIB_CHAR)((value >> 40) & 0xFFu);
_p[6] = (STRINGLIB_CHAR)((value >> 48) & 0xFFu);
_p[7] = (STRINGLIB_CHAR)((value >> 56) & 0xFFu);
# endif
#else
# if SIZEOF_SIZE_T == 8
_p[0] = (STRINGLIB_CHAR)((value >> 56) & 0xFFu);
_p[1] = (STRINGLIB_CHAR)((value >> 48) & 0xFFu);
_p[2] = (STRINGLIB_CHAR)((value >> 40) & 0xFFu);
_p[3] = (STRINGLIB_CHAR)((value >> 32) & 0xFFu);
_p[4] = (STRINGLIB_CHAR)((value >> 24) & 0xFFu);
_p[5] = (STRINGLIB_CHAR)((value >> 16) & 0xFFu);
_p[6] = (STRINGLIB_CHAR)((value >> 8) & 0xFFu);
_p[7] = (STRINGLIB_CHAR)(value & 0xFFu);
# else
_p[0] = (STRINGLIB_CHAR)((value >> 24) & 0xFFu);
_p[1] = (STRINGLIB_CHAR)((value >> 16) & 0xFFu);
_p[2] = (STRINGLIB_CHAR)((value >> 8) & 0xFFu);
_p[3] = (STRINGLIB_CHAR)(value & 0xFFu);
# endif
#endif
_s += SIZEOF_SIZE_T;
_p += SIZEOF_SIZE_T;
}
s = _s;
p = _p;
if (s == end)
break;
ch = (unsigned char)*s;
}
if (ch < 0x80) {
s++;
*p++ = ch;
continue;
}
}
if (ch < 0xE0) {
/* \xC2\x80-\xDF\xBF -- 0080-07FF */
Py_UCS4 ch2;
if (ch < 0xC2) {
/* invalid sequence
\x80-\xBF -- continuation byte
\xC0-\xC1 -- fake 0000-007F */
goto InvalidStart;
}
if (end - s < 2) {
/* unexpected end of data: the caller will decide whether
it's an error or not */
break;
}
ch2 = (unsigned char)s[1];
if (!IS_CONTINUATION_BYTE(ch2))
/* invalid continuation byte */
goto InvalidContinuation1;
ch = (ch << 6) + ch2 -
((0xC0 << 6) + 0x80);
assert ((ch > 0x007F) && (ch <= 0x07FF));
s += 2;
if (STRINGLIB_MAX_CHAR <= 0x007F ||
(STRINGLIB_MAX_CHAR < 0x07FF && ch > STRINGLIB_MAX_CHAR))
/* Out-of-range */
goto Return;
*p++ = ch;
continue;
}
if (ch < 0xF0) {
/* \xE0\xA0\x80-\xEF\xBF\xBF -- 0800-FFFF */
Py_UCS4 ch2, ch3;
if (end - s < 3) {
/* unexpected end of data: the caller will decide whether
it's an error or not */
if (end - s < 2)
break;
ch2 = (unsigned char)s[1];
if (!IS_CONTINUATION_BYTE(ch2) ||
(ch2 < 0xA0 ? ch == 0xE0 : ch == 0xED))
/* for clarification see comments below */
goto InvalidContinuation1;
break;
}
ch2 = (unsigned char)s[1];
ch3 = (unsigned char)s[2];
if (!IS_CONTINUATION_BYTE(ch2)) {
/* invalid continuation byte */
goto InvalidContinuation1;
}
if (ch == 0xE0) {
if (ch2 < 0xA0)
/* invalid sequence
\xE0\x80\x80-\xE0\x9F\xBF -- fake 0000-0800 */
goto InvalidContinuation1;
} else if (ch == 0xED && ch2 >= 0xA0) {
/* Decoding UTF-8 sequences in range \xED\xA0\x80-\xED\xBF\xBF
will result in surrogates in range D800-DFFF. Surrogates are
not valid UTF-8 so they are rejected.
See https://www.unicode.org/versions/Unicode5.2.0/ch03.pdf
(table 3-7) and http://www.rfc-editor.org/rfc/rfc3629.txt */
goto InvalidContinuation1;
}
if (!IS_CONTINUATION_BYTE(ch3)) {
/* invalid continuation byte */
goto InvalidContinuation2;
}
ch = (ch << 12) + (ch2 << 6) + ch3 -
((0xE0 << 12) + (0x80 << 6) + 0x80);
assert ((ch > 0x07FF) && (ch <= 0xFFFF));
s += 3;
if (STRINGLIB_MAX_CHAR <= 0x07FF ||
(STRINGLIB_MAX_CHAR < 0xFFFF && ch > STRINGLIB_MAX_CHAR))
/* Out-of-range */
goto Return;
*p++ = ch;
continue;
}
if (ch < 0xF5) {
/* \xF0\x90\x80\x80-\xF4\x8F\xBF\xBF -- 10000-10FFFF */
Py_UCS4 ch2, ch3, ch4;
if (end - s < 4) {
/* unexpected end of data: the caller will decide whether
it's an error or not */
if (end - s < 2)
break;
ch2 = (unsigned char)s[1];
if (!IS_CONTINUATION_BYTE(ch2) ||
(ch2 < 0x90 ? ch == 0xF0 : ch == 0xF4))
/* for clarification see comments below */
goto InvalidContinuation1;
if (end - s < 3)
break;
ch3 = (unsigned char)s[2];
if (!IS_CONTINUATION_BYTE(ch3))
goto InvalidContinuation2;
break;
}
ch2 = (unsigned char)s[1];
ch3 = (unsigned char)s[2];
ch4 = (unsigned char)s[3];
if (!IS_CONTINUATION_BYTE(ch2)) {
/* invalid continuation byte */
goto InvalidContinuation1;
}
if (ch == 0xF0) {
if (ch2 < 0x90)
/* invalid sequence
\xF0\x80\x80\x80-\xF0\x8F\xBF\xBF -- fake 0000-FFFF */
goto InvalidContinuation1;
} else if (ch == 0xF4 && ch2 >= 0x90) {
/* invalid sequence
\xF4\x90\x80\x80- -- 110000- overflow */
goto InvalidContinuation1;
}
if (!IS_CONTINUATION_BYTE(ch3)) {
/* invalid continuation byte */
goto InvalidContinuation2;
}
if (!IS_CONTINUATION_BYTE(ch4)) {
/* invalid continuation byte */
goto InvalidContinuation3;
}
ch = (ch << 18) + (ch2 << 12) + (ch3 << 6) + ch4 -
((0xF0 << 18) + (0x80 << 12) + (0x80 << 6) + 0x80);
assert ((ch > 0xFFFF) && (ch <= 0x10FFFF));
s += 4;
if (STRINGLIB_MAX_CHAR <= 0xFFFF ||
(STRINGLIB_MAX_CHAR < 0x10FFFF && ch > STRINGLIB_MAX_CHAR))
/* Out-of-range */
goto Return;
*p++ = ch;
continue;
}
goto InvalidStart;
}
ch = 0;
Return:
*inptr = s;
*outpos = p - dest;
return ch;
InvalidStart:
ch = 1;
goto Return;
InvalidContinuation1:
ch = 2;
goto Return;
InvalidContinuation2:
ch = 3;
goto Return;
InvalidContinuation3:
ch = 4;
goto Return;
}
#undef ASCII_CHAR_MASK
/* UTF-8 encoder specialized for a Unicode kind to avoid the slow
PyUnicode_READ() macro. Delete some parts of the code depending on the kind:
UCS-1 strings don't need to handle surrogates for example. */
Py_LOCAL_INLINE(char *)
STRINGLIB(utf8_encoder)(_PyBytesWriter *writer,
PyObject *unicode,
const STRINGLIB_CHAR *data,
Py_ssize_t size,
_Py_error_handler error_handler,
const char *errors)
{
Py_ssize_t i; /* index into data of next input character */
char *p; /* next free byte in output buffer */
#if STRINGLIB_SIZEOF_CHAR > 1
PyObject *error_handler_obj = NULL;
PyObject *exc = NULL;
PyObject *rep = NULL;
#endif
#if STRINGLIB_SIZEOF_CHAR == 1
const Py_ssize_t max_char_size = 2;
#elif STRINGLIB_SIZEOF_CHAR == 2
const Py_ssize_t max_char_size = 3;
#else /* STRINGLIB_SIZEOF_CHAR == 4 */
const Py_ssize_t max_char_size = 4;
#endif
assert(size >= 0);
if (size > PY_SSIZE_T_MAX / max_char_size) {
/* integer overflow */
PyErr_NoMemory();
return NULL;
}
_PyBytesWriter_Init(writer);
p = _PyBytesWriter_Alloc(writer, size * max_char_size);
if (p == NULL)
return NULL;
for (i = 0; i < size;) {
Py_UCS4 ch = data[i++];
if (ch < 0x80) {
/* Encode ASCII */
*p++ = (char) ch;
}
else
#if STRINGLIB_SIZEOF_CHAR > 1
if (ch < 0x0800)
#endif
{
/* Encode Latin-1 */
*p++ = (char)(0xc0 | (ch >> 6));
*p++ = (char)(0x80 | (ch & 0x3f));
}
#if STRINGLIB_SIZEOF_CHAR > 1
else if (Py_UNICODE_IS_SURROGATE(ch)) {
Py_ssize_t startpos, endpos, newpos;
Py_ssize_t k;
if (error_handler == _Py_ERROR_UNKNOWN) {
error_handler = _Py_GetErrorHandler(errors);
}
startpos = i-1;
endpos = startpos+1;
while ((endpos < size) && Py_UNICODE_IS_SURROGATE(data[endpos]))
endpos++;
/* Only overallocate the buffer if it's not the last write */
writer->overallocate = (endpos < size);
switch (error_handler)
{
case _Py_ERROR_REPLACE:
memset(p, '?', endpos - startpos);
p += (endpos - startpos);
_Py_FALLTHROUGH;
case _Py_ERROR_IGNORE:
i += (endpos - startpos - 1);
break;
case _Py_ERROR_SURROGATEPASS:
for (k=startpos; k<endpos; k++) {
ch = data[k];
*p++ = (char)(0xe0 | (ch >> 12));
*p++ = (char)(0x80 | ((ch >> 6) & 0x3f));
*p++ = (char)(0x80 | (ch & 0x3f));
}
i += (endpos - startpos - 1);
break;
case _Py_ERROR_BACKSLASHREPLACE:
/* subtract preallocated bytes */
writer->min_size -= max_char_size * (endpos - startpos);
p = backslashreplace(writer, p,
unicode, startpos, endpos);
if (p == NULL)
goto error;
i += (endpos - startpos - 1);
break;
case _Py_ERROR_XMLCHARREFREPLACE:
/* subtract preallocated bytes */
writer->min_size -= max_char_size * (endpos - startpos);
p = xmlcharrefreplace(writer, p,
unicode, startpos, endpos);
if (p == NULL)
goto error;
i += (endpos - startpos - 1);
break;
case _Py_ERROR_SURROGATEESCAPE:
for (k=startpos; k<endpos; k++) {
ch = data[k];
if (!(0xDC80 <= ch && ch <= 0xDCFF))
break;
*p++ = (char)(ch & 0xff);
}
if (k >= endpos) {
i += (endpos - startpos - 1);
break;
}
startpos = k;
assert(startpos < endpos);
_Py_FALLTHROUGH;
default:
rep = unicode_encode_call_errorhandler(
errors, &error_handler_obj, "utf-8", "surrogates not allowed",
unicode, &exc, startpos, endpos, &newpos);
if (!rep)
goto error;
if (newpos < startpos) {
writer->overallocate = 1;
p = _PyBytesWriter_Prepare(writer, p,
max_char_size * (startpos - newpos));
if (p == NULL)
goto error;
}
else {
/* subtract preallocated bytes */
writer->min_size -= max_char_size * (newpos - startpos);
/* Only overallocate the buffer if it's not the last write */
writer->overallocate = (newpos < size);
}
if (PyBytes_Check(rep)) {
p = _PyBytesWriter_WriteBytes(writer, p,
PyBytes_AS_STRING(rep),
PyBytes_GET_SIZE(rep));
}
else {
/* rep is unicode */
if (!PyUnicode_IS_ASCII(rep)) {
raise_encode_exception(&exc, "utf-8", unicode,
startpos, endpos,
"surrogates not allowed");
goto error;
}
p = _PyBytesWriter_WriteBytes(writer, p,
PyUnicode_DATA(rep),
PyUnicode_GET_LENGTH(rep));
}
if (p == NULL)
goto error;
Py_CLEAR(rep);
i = newpos;
}
/* If overallocation was disabled, ensure that it was the last
write. Otherwise, we missed an optimization */
assert(writer->overallocate || i == size);
}
else
#if STRINGLIB_SIZEOF_CHAR > 2
if (ch < 0x10000)
#endif
{
*p++ = (char)(0xe0 | (ch >> 12));
*p++ = (char)(0x80 | ((ch >> 6) & 0x3f));
*p++ = (char)(0x80 | (ch & 0x3f));
}
#if STRINGLIB_SIZEOF_CHAR > 2
else /* ch >= 0x10000 */
{
assert(ch <= MAX_UNICODE);
/* Encode UCS4 Unicode ordinals */
*p++ = (char)(0xf0 | (ch >> 18));
*p++ = (char)(0x80 | ((ch >> 12) & 0x3f));
*p++ = (char)(0x80 | ((ch >> 6) & 0x3f));
*p++ = (char)(0x80 | (ch & 0x3f));
}
#endif /* STRINGLIB_SIZEOF_CHAR > 2 */
#endif /* STRINGLIB_SIZEOF_CHAR > 1 */
}
#if STRINGLIB_SIZEOF_CHAR > 1
Py_XDECREF(error_handler_obj);
Py_XDECREF(exc);
#endif
return p;
#if STRINGLIB_SIZEOF_CHAR > 1
error:
Py_XDECREF(rep);
Py_XDECREF(error_handler_obj);
Py_XDECREF(exc);
return NULL;
#endif
}
/* The pattern for constructing UCS2-repeated masks. */
#if SIZEOF_LONG == 8
# define UCS2_REPEAT_MASK 0x0001000100010001ul
#elif SIZEOF_LONG == 4
# define UCS2_REPEAT_MASK 0x00010001ul
#else
# error C 'long' size should be either 4 or 8!
#endif
/* The mask for fast checking. */
#if STRINGLIB_SIZEOF_CHAR == 1
/* The mask for fast checking of whether a C 'long' contains a
non-ASCII or non-Latin1 UTF16-encoded characters. */
# define FAST_CHAR_MASK (UCS2_REPEAT_MASK * (0xFFFFu & ~STRINGLIB_MAX_CHAR))
#else
/* The mask for fast checking of whether a C 'long' may contain
UTF16-encoded surrogate characters. This is an efficient heuristic,
assuming that non-surrogate characters with a code point >= 0x8000 are
rare in most input.
*/
# define FAST_CHAR_MASK (UCS2_REPEAT_MASK * 0x8000u)
#endif
/* The mask for fast byte-swapping. */
#define STRIPPED_MASK (UCS2_REPEAT_MASK * 0x00FFu)
/* Swap bytes. */
#define SWAB(value) ((((value) >> 8) & STRIPPED_MASK) | \
(((value) & STRIPPED_MASK) << 8))
Py_LOCAL_INLINE(Py_UCS4)
STRINGLIB(utf16_decode)(const unsigned char **inptr, const unsigned char *e,
STRINGLIB_CHAR *dest, Py_ssize_t *outpos,
int native_ordering)
{
Py_UCS4 ch;
const unsigned char *q = *inptr;
STRINGLIB_CHAR *p = dest + *outpos;
/* Offsets from q for retrieving byte pairs in the right order. */
#if PY_LITTLE_ENDIAN
int ihi = !!native_ordering, ilo = !native_ordering;
#else
int ihi = !native_ordering, ilo = !!native_ordering;
#endif
--e;
while (q < e) {
Py_UCS4 ch2;
/* First check for possible aligned read of a C 'long'. Unaligned
reads are more expensive, better to defer to another iteration. */
if (_Py_IS_ALIGNED(q, ALIGNOF_LONG)) {
/* Fast path for runs of in-range non-surrogate chars. */
const unsigned char *_q = q;
while (_q + SIZEOF_LONG <= e) {
unsigned long block = * (const unsigned long *) _q;
if (native_ordering) {
/* Can use buffer directly */
if (block & FAST_CHAR_MASK)
break;
}
else {
/* Need to byte-swap */
if (block & SWAB(FAST_CHAR_MASK))
break;
#if STRINGLIB_SIZEOF_CHAR == 1
block >>= 8;
#else
block = SWAB(block);
#endif
}
#if PY_LITTLE_ENDIAN
# if SIZEOF_LONG == 4
p[0] = (STRINGLIB_CHAR)(block & 0xFFFFu);
p[1] = (STRINGLIB_CHAR)(block >> 16);
# elif SIZEOF_LONG == 8
p[0] = (STRINGLIB_CHAR)(block & 0xFFFFu);
p[1] = (STRINGLIB_CHAR)((block >> 16) & 0xFFFFu);
p[2] = (STRINGLIB_CHAR)((block >> 32) & 0xFFFFu);
p[3] = (STRINGLIB_CHAR)(block >> 48);
# endif
#else
# if SIZEOF_LONG == 4
p[0] = (STRINGLIB_CHAR)(block >> 16);
p[1] = (STRINGLIB_CHAR)(block & 0xFFFFu);
# elif SIZEOF_LONG == 8
p[0] = (STRINGLIB_CHAR)(block >> 48);
p[1] = (STRINGLIB_CHAR)((block >> 32) & 0xFFFFu);
p[2] = (STRINGLIB_CHAR)((block >> 16) & 0xFFFFu);
p[3] = (STRINGLIB_CHAR)(block & 0xFFFFu);
# endif
#endif
_q += SIZEOF_LONG;
p += SIZEOF_LONG / 2;
}
q = _q;
if (q >= e)
break;
}
ch = (q[ihi] << 8) | q[ilo];
q += 2;
if (!Py_UNICODE_IS_SURROGATE(ch)) {
#if STRINGLIB_SIZEOF_CHAR < 2
if (ch > STRINGLIB_MAX_CHAR)
/* Out-of-range */
goto Return;
#endif
*p++ = (STRINGLIB_CHAR)ch;
continue;
}
/* UTF-16 code pair: */
if (!Py_UNICODE_IS_HIGH_SURROGATE(ch))
goto IllegalEncoding;
if (q >= e)
goto UnexpectedEnd;
ch2 = (q[ihi] << 8) | q[ilo];
q += 2;
if (!Py_UNICODE_IS_LOW_SURROGATE(ch2))
goto IllegalSurrogate;
ch = Py_UNICODE_JOIN_SURROGATES(ch, ch2);
#if STRINGLIB_SIZEOF_CHAR < 4
/* Out-of-range */
goto Return;
#else
*p++ = (STRINGLIB_CHAR)ch;
#endif
}
ch = 0;
Return:
*inptr = q;
*outpos = p - dest;
return ch;
UnexpectedEnd:
ch = 1;
goto Return;
IllegalEncoding:
ch = 2;
goto Return;
IllegalSurrogate:
ch = 3;
goto Return;
}
#undef UCS2_REPEAT_MASK
#undef FAST_CHAR_MASK
#undef STRIPPED_MASK
#undef SWAB
#if STRINGLIB_MAX_CHAR >= 0x80
Py_LOCAL_INLINE(Py_ssize_t)
STRINGLIB(utf16_encode)(const STRINGLIB_CHAR *in,
Py_ssize_t len,
unsigned short **outptr,
int native_ordering)
{
unsigned short *out = *outptr;
const STRINGLIB_CHAR *end = in + len;
#if STRINGLIB_SIZEOF_CHAR == 1
if (native_ordering) {
const STRINGLIB_CHAR *unrolled_end = in + _Py_SIZE_ROUND_DOWN(len, 4);
while (in < unrolled_end) {
out[0] = in[0];
out[1] = in[1];
out[2] = in[2];
out[3] = in[3];
in += 4; out += 4;
}
while (in < end) {
*out++ = *in++;
}
} else {
# define SWAB2(CH) ((CH) << 8) /* high byte is zero */
const STRINGLIB_CHAR *unrolled_end = in + _Py_SIZE_ROUND_DOWN(len, 4);
while (in < unrolled_end) {
out[0] = SWAB2(in[0]);
out[1] = SWAB2(in[1]);
out[2] = SWAB2(in[2]);
out[3] = SWAB2(in[3]);
in += 4; out += 4;
}
while (in < end) {
Py_UCS4 ch = *in++;
*out++ = SWAB2((Py_UCS2)ch);
}
#undef SWAB2
}
*outptr = out;
return len;
#else
if (native_ordering) {
#if STRINGLIB_MAX_CHAR < 0x10000
const STRINGLIB_CHAR *unrolled_end = in + _Py_SIZE_ROUND_DOWN(len, 4);
while (in < unrolled_end) {
/* check if any character is a surrogate character */
if (((in[0] ^ 0xd800) &
(in[1] ^ 0xd800) &
(in[2] ^ 0xd800) &
(in[3] ^ 0xd800) & 0xf800) == 0)
break;
out[0] = in[0];
out[1] = in[1];
out[2] = in[2];
out[3] = in[3];
in += 4; out += 4;
}
#endif
while (in < end) {
Py_UCS4 ch;
ch = *in++;
if (ch < 0xd800)
*out++ = ch;
else if (ch < 0xe000)
/* reject surrogate characters (U+D800-U+DFFF) */
goto fail;
#if STRINGLIB_MAX_CHAR >= 0x10000
else if (ch >= 0x10000) {
out[0] = Py_UNICODE_HIGH_SURROGATE(ch);
out[1] = Py_UNICODE_LOW_SURROGATE(ch);
out += 2;
}
#endif
else
*out++ = ch;
}
} else {
#define SWAB2(CH) (((CH) << 8) | ((CH) >> 8))
#if STRINGLIB_MAX_CHAR < 0x10000
const STRINGLIB_CHAR *unrolled_end = in + _Py_SIZE_ROUND_DOWN(len, 4);
while (in < unrolled_end) {
/* check if any character is a surrogate character */
if (((in[0] ^ 0xd800) &
(in[1] ^ 0xd800) &
(in[2] ^ 0xd800) &
(in[3] ^ 0xd800) & 0xf800) == 0)
break;
out[0] = SWAB2(in[0]);
out[1] = SWAB2(in[1]);
out[2] = SWAB2(in[2]);
out[3] = SWAB2(in[3]);
in += 4; out += 4;
}
#endif
while (in < end) {
Py_UCS4 ch = *in++;
if (ch < 0xd800)
*out++ = SWAB2((Py_UCS2)ch);
else if (ch < 0xe000)
/* reject surrogate characters (U+D800-U+DFFF) */
goto fail;
#if STRINGLIB_MAX_CHAR >= 0x10000
else if (ch >= 0x10000) {
Py_UCS2 ch1 = Py_UNICODE_HIGH_SURROGATE(ch);
Py_UCS2 ch2 = Py_UNICODE_LOW_SURROGATE(ch);
out[0] = SWAB2(ch1);
out[1] = SWAB2(ch2);
out += 2;
}
#endif
else
*out++ = SWAB2((Py_UCS2)ch);
}
#undef SWAB2
}
*outptr = out;
return len;
fail:
*outptr = out;
return len - (end - in + 1);
#endif
}
static inline uint32_t
STRINGLIB(SWAB4)(STRINGLIB_CHAR ch)
{
uint32_t word = ch;
#if STRINGLIB_SIZEOF_CHAR == 1
/* high bytes are zero */
return (word << 24);
#elif STRINGLIB_SIZEOF_CHAR == 2
/* high bytes are zero */
return ((word & 0x00FFu) << 24) | ((word & 0xFF00u) << 8);
#else
return _Py_bswap32(word);
#endif
}
Py_LOCAL_INLINE(Py_ssize_t)
STRINGLIB(utf32_encode)(const STRINGLIB_CHAR *in,
Py_ssize_t len,
uint32_t **outptr,
int native_ordering)
{
uint32_t *out = *outptr;
const STRINGLIB_CHAR *end = in + len;
if (native_ordering) {
const STRINGLIB_CHAR *unrolled_end = in + _Py_SIZE_ROUND_DOWN(len, 4);
while (in < unrolled_end) {
#if STRINGLIB_SIZEOF_CHAR > 1
/* check if any character is a surrogate character */
if (((in[0] ^ 0xd800) &
(in[1] ^ 0xd800) &
(in[2] ^ 0xd800) &
(in[3] ^ 0xd800) & 0xf800) == 0)
break;
#endif
out[0] = in[0];
out[1] = in[1];
out[2] = in[2];
out[3] = in[3];
in += 4; out += 4;
}
while (in < end) {
Py_UCS4 ch;
ch = *in++;
#if STRINGLIB_SIZEOF_CHAR > 1
if (Py_UNICODE_IS_SURROGATE(ch)) {
/* reject surrogate characters (U+D800-U+DFFF) */
goto fail;
}
#endif
*out++ = ch;
}
} else {
const STRINGLIB_CHAR *unrolled_end = in + _Py_SIZE_ROUND_DOWN(len, 4);
while (in < unrolled_end) {
#if STRINGLIB_SIZEOF_CHAR > 1
/* check if any character is a surrogate character */
if (((in[0] ^ 0xd800) &
(in[1] ^ 0xd800) &
(in[2] ^ 0xd800) &
(in[3] ^ 0xd800) & 0xf800) == 0)
break;
#endif
out[0] = STRINGLIB(SWAB4)(in[0]);
out[1] = STRINGLIB(SWAB4)(in[1]);
out[2] = STRINGLIB(SWAB4)(in[2]);
out[3] = STRINGLIB(SWAB4)(in[3]);
in += 4; out += 4;
}
while (in < end) {
Py_UCS4 ch = *in++;
#if STRINGLIB_SIZEOF_CHAR > 1
if (Py_UNICODE_IS_SURROGATE(ch)) {
/* reject surrogate characters (U+D800-U+DFFF) */
goto fail;
}
#endif
*out++ = STRINGLIB(SWAB4)(ch);
}
}
*outptr = out;
return len;
#if STRINGLIB_SIZEOF_CHAR > 1
fail:
*outptr = out;
return len - (end - in + 1);
#endif
}
#endif
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