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cpython/Python/pystrhex.c at 22b0de2755ee2d0e2dd21cd8761f15421ed2da3d · python/cpython · GitHub
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/* Format bytes as hexadecimal */
#include
"Python.h"
#include
"pycore_strhex.h"
// _Py_strhex_with_sep()
#include
"pycore_unicodeobject.h"
// _PyUnicode_CheckConsistency()
static
PyObject
*
_Py_strhex_impl
(
const
char
*
argbuf
,
const
Py_ssize_t
arglen
,
PyObject
*
sep
,
int
bytes_per_sep_group
,
const
int
return_bytes
)
{
assert
(
arglen
>=
0
);
Py_UCS1
sep_char
=
0
;
if
(
sep
) {
Py_ssize_t
seplen
=
PyObject_Length
((
PyObject
*
)
sep
);
if
(
seplen
<
0
) {
return
NULL
;
}
if
(
seplen
!=
1
) {
PyErr_SetString
(
PyExc_ValueError
,
"sep must be length 1."
);
return
NULL
;
}
if
(
PyUnicode_Check
(
sep
)) {
if
(
PyUnicode_KIND
(
sep
)
!=
PyUnicode_1BYTE_KIND
) {
PyErr_SetString
(
PyExc_ValueError
,
"sep must be ASCII."
);
return
NULL
;
}
sep_char
=
PyUnicode_READ_CHAR
(
sep
,
0
);
}
else
if
(
PyBytes_Check
(
sep
)) {
sep_char
=
PyBytes_AS_STRING
(
sep
)[
0
];
}
else
{
PyErr_SetString
(
PyExc_TypeError
,
"sep must be str or bytes."
);
return
NULL
;
}
if
(
sep_char
>
127
&&
!
return_bytes
) {
PyErr_SetString
(
PyExc_ValueError
,
"sep must be ASCII."
);
return
NULL
;
}
}
else
{
bytes_per_sep_group
=
0
;
}
unsigned
int
abs_bytes_per_sep
=
Py_ABS
(
bytes_per_sep_group
);
Py_ssize_t
resultlen
=
0
;
if
(
bytes_per_sep_group
&&
arglen
>
0
) {
/* How many sep characters we'll be inserting. */
resultlen
=
(
arglen
-
1
) /
abs_bytes_per_sep
;
}
/* Bounds checking for our Py_ssize_t indices. */
if
(
arglen
>=
PY_SSIZE_T_MAX
/
2
-
resultlen
) {
return
PyErr_NoMemory
();
}
resultlen
+=
arglen
*
2
;
if
((
size_t
)
abs_bytes_per_sep
>= (
size_t
)
arglen
) {
bytes_per_sep_group
=
0
;
abs_bytes_per_sep
=
0
;
}
PyObject
*
retval
;
Py_UCS1
*
retbuf
;
if
(
return_bytes
) {
/* If _PyBytes_FromSize() were public we could avoid malloc+copy. */
retval
=
PyBytes_FromStringAndSize
(
NULL
,
resultlen
);
if
(!
retval
) {
return
NULL
;
}
retbuf
=
(
Py_UCS1
*
)
PyBytes_AS_STRING
(
retval
);
}
else
{
retval
=
PyUnicode_New
(
resultlen
,
127
);
if
(!
retval
) {
return
NULL
;
}
retbuf
=
PyUnicode_1BYTE_DATA
(
retval
);
}
/* Hexlify */
Py_ssize_t
i
,
j
;
unsigned
char
c
;
if
(
bytes_per_sep_group
==
0
) {
for
(
i
=
j
=
0
;
i
<
arglen
;
++
i
) {
assert
((
j
+
1
)
<
resultlen
);
c
=
argbuf
[
i
];
retbuf
[
j
++
]
=
Py_hexdigits
[
c
>>
4
];
retbuf
[
j
++
]
=
Py_hexdigits
[
c
&
0x0f
];
}
assert
(
j
==
resultlen
);
}
else
{
/* The number of complete chunk+sep periods */
Py_ssize_t
chunks
=
(
arglen
-
1
) /
abs_bytes_per_sep
;
Py_ssize_t
chunk
;
unsigned
int
k
;
if
(
bytes_per_sep_group
<
0
) {
i
=
j
=
0
;
for
(
chunk
=
0
;
chunk
<
chunks
;
chunk
++
) {
for
(
k
=
0
;
k
<
abs_bytes_per_sep
;
k
++
) {
c
=
argbuf
[
i
++
];
retbuf
[
j
++
]
=
Py_hexdigits
[
c
>>
4
];
retbuf
[
j
++
]
=
Py_hexdigits
[
c
&
0x0f
];
}
retbuf
[
j
++
]
=
sep_char
;
}
while
(
i
<
arglen
) {
c
=
argbuf
[
i
++
];
retbuf
[
j
++
]
=
Py_hexdigits
[
c
>>
4
];
retbuf
[
j
++
]
=
Py_hexdigits
[
c
&
0x0f
];
}
assert
(
j
==
resultlen
);
}
else
{
i
=
arglen
-
1
;
j
=
resultlen
-
1
;
for
(
chunk
=
0
;
chunk
<
chunks
;
chunk
++
) {
for
(
k
=
0
;
k
<
abs_bytes_per_sep
;
k
++
) {
c
=
argbuf
[
i
--
];
retbuf
[
j
--
]
=
Py_hexdigits
[
c
&
0x0f
];
retbuf
[
j
--
]
=
Py_hexdigits
[
c
>>
4
];
}
retbuf
[
j
--
]
=
sep_char
;
}
while
(
i
>=
0
) {
c
=
argbuf
[
i
--
];
retbuf
[
j
--
]
=
Py_hexdigits
[
c
&
0x0f
];
retbuf
[
j
--
]
=
Py_hexdigits
[
c
>>
4
];
}
assert
(
j
==
-1
);
}
}
#ifdef
Py_DEBUG
if
(!
return_bytes
) {
assert
(
_PyUnicode_CheckConsistency
(
retval
,
1
));
}
#endif
return
retval
;
}
PyObject
*
_Py_strhex
(
const
char
*
argbuf
,
const
Py_ssize_t
arglen
)
{
return
_Py_strhex_impl
(
argbuf
,
arglen
,
NULL
,
0
,
0
);
}
/* Same as above but returns a bytes() instead of str() to avoid the
* need to decode the str() when bytes are needed. */
PyObject
*
_Py_strhex_bytes
(
const
char
*
argbuf
,
const
Py_ssize_t
arglen
)
{
return
_Py_strhex_impl
(
argbuf
,
arglen
,
NULL
,
0
,
1
);
}
/* These variants include support for a separator between every N bytes: */
PyObject
*
_Py_strhex_with_sep
(
const
char
*
argbuf
,
const
Py_ssize_t
arglen
,
PyObject
*
sep
,
const
int
bytes_per_group
)
{
return
_Py_strhex_impl
(
argbuf
,
arglen
,
sep
,
bytes_per_group
,
0
);
}
/* Same as above but returns a bytes() instead of str() to avoid the
* need to decode the str() when bytes are needed. */
PyObject
*
_Py_strhex_bytes_with_sep
(
const
char
*
argbuf
,
const
Py_ssize_t
arglen
,
PyObject
*
sep
,
const
int
bytes_per_group
)
{
return
_Py_strhex_impl
(
argbuf
,
arglen
,
sep
,
bytes_per_group
,
1
);
}
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