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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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2
Include/longobject.h
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@ -65,7 +65,7 @@ PyAPI_FUNC(PyObject *) PyLong_GetInfo(void);
# error "void* different in size from int, long and long long"
#endif /* SIZEOF_VOID_P */
/* Used by Python/mystrtoul.c. */
/* Used by Python/mystrtoul.c and _PyBytes_FromHex(). */
#ifndef Py_LIMITED_API
PyAPI_DATA(unsigned char) _PyLong_DigitValue[256];
#endif