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cpython/Python/pystrhex.c at 3.7 · python/cpython · GitHub
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pystrhex.c
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61 lines (52 loc) · 1.67 KB
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cpython
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pystrhex.c
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/* bytes to hex implementation */
#include
"Python.h"
static
PyObject
*
_Py_strhex_impl
(
const
char
*
argbuf
,
const
Py_ssize_t
arglen
,
int
return_bytes
)
{
PyObject
*
retval
;
Py_UCS1
*
retbuf
;
Py_ssize_t
i
,
j
;
assert
(
arglen
>=
0
);
if
(
arglen
>
PY_SSIZE_T_MAX
/
2
)
return
PyErr_NoMemory
();
if
(
return_bytes
) {
/* If _PyBytes_FromSize() were public we could avoid malloc+copy. */
retbuf
=
(
Py_UCS1
*
)
PyMem_Malloc
(
arglen
*
2
);
if
(!
retbuf
)
return
PyErr_NoMemory
();
retval
=
NULL
;
/* silence a compiler warning, assigned later. */
}
else
{
retval
=
PyUnicode_New
(
arglen
*
2
,
127
);
if
(!
retval
)
return
NULL
;
retbuf
=
PyUnicode_1BYTE_DATA
(
retval
);
}
/* make hex version of string, taken from shamodule.c */
for
(
i
=
j
=
0
;
i
<
arglen
;
i
++
) {
unsigned
char
c
;
c
=
(
argbuf
[
i
] >>
4
)
&
0xf
;
retbuf
[
j
++
]
=
Py_hexdigits
[
c
];
c
=
argbuf
[
i
]
&
0xf
;
retbuf
[
j
++
]
=
Py_hexdigits
[
c
];
}
if
(
return_bytes
) {
retval
=
PyBytes_FromStringAndSize
((
const
char
*
)
retbuf
,
arglen
*
2
);
PyMem_Free
(
retbuf
);
}
#ifdef
Py_DEBUG
else
{
assert
(
_PyUnicode_CheckConsistency
(
retval
,
1
));
}
#endif
return
retval
;
}
PyAPI_FUNC
(
PyObject
*
)
_Py_strhex
(
const
char
*
argbuf
,
const
Py_ssize_t
arglen
)
{
return
_Py_strhex_impl
(
argbuf
,
arglen
,
0
);
}
/* Same as above but returns a bytes() instead of str() to avoid the
* need to decode the str() when bytes are needed. */
PyAPI_FUNC
(
PyObject
*
)
_Py_strhex_bytes
(
const
char
*
argbuf
,
const
Py_ssize_t
arglen
)
{
return
_Py_strhex_impl
(
argbuf
,
arglen
,
1
);
}
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