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Optimize bytes.fromhex() and bytearray.fromhex()

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Issue #25401: Optimize bytes.fromhex() and bytearray.fromhex(): they are now
between 2x and 3.5x faster. Changes:

* Use a fast-path working on a char* string for ASCII string
* Use a slow-path for non-ASCII string
* Replace slow hex_digit_to_int() function with a O(1) lookup in
  _PyLong_DigitValue precomputed table
* Use _PyBytesWriter API to handle the buffer
* Add unit tests to check the error position in error messages
This commit is contained in:
Victor Stinner 2015-10-14 11:25:33 +02:00
parent ebcf9edc05
commit 2bf8993db9
7 changed files with 101 additions and 95 deletions
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3
Include/bytesobject.h
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@ -67,6 +67,9 @@ PyAPI_FUNC(PyObject*) _PyBytes_FormatEx(
Py_ssize_t format_len,
PyObject *args,
int use_bytearray);
PyAPI_FUNC(PyObject*) _PyBytes_FromHex(
PyObject *string,
int use_bytearray);
#endif
PyAPI_FUNC(PyObject *) PyBytes_DecodeEscape(const char *, Py_ssize_t,
const char *, Py_ssize_t,