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fix my byte-swapping implementation (#4772)

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Benjamin Peterson 2017-12-09 12:18:56 -08:00 committed by GitHub
parent 4e3e156391
commit 83620773ee
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 10 additions and 10 deletions
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20
Python/import.c
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@ -2197,21 +2197,21 @@ static PyObject *
_imp_source_hash_impl(PyObject *module, long key, Py_buffer *source)
/*[clinic end generated code: output=edb292448cf399ea input=9aaad1e590089789]*/
{
uint64_t hash = _Py_KeyedHash((uint64_t)key, source->buf, source->len);
union {
uint64_t x;
char data[sizeof(uint64_t)];
} hash;
hash.x = _Py_KeyedHash((uint64_t)key, source->buf, source->len);
#if !PY_LITTLE_ENDIAN
// Force to little-endian. There really ought to be a succinct standard way
// to do this.
union {
uint64_t x;
unsigned char data[sizeof(uint64_t)];
} pun;
pun.x = hash;
for (size_t i = 0; i < sizeof(pun.data); i++) {
pun.data[sizeof(pun.data) - i - 1] = pun.data[i];
for (size_t i = 0; i < sizeof(hash.data)/2; i++) {
char tmp = hash.data[i];
hash.data[i] = hash.data[sizeof(hash.data) - i - 1];
hash.data[sizeof(hash.data) - i - 1] = tmp;
}
hash = pun.x;
#endif
return PyBytes_FromStringAndSize((const char *)&hash, sizeof(hash));
return PyBytes_FromStringAndSize(hash.data, sizeof(hash.data));
}