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