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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
);
/* fall through */
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
);
/* fall through */
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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