mirror of
https://github.com/python/cpython
synced 2024-11-02 08:22:14 +00:00
61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/* 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);
|
|
}
|