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reference struct "XXH64_state_t" only via an opaque pointer

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Upstream recommends this whenever xxhash is linked dynamically:
https://github.com/Cyan4973/xxHash/issues/63#issuecomment-218376237

This change is required to unbundle xxhash in the next commit.
This commit is contained in:
Felix Schwarz 2019-06-03 23:34:20 +02:00
parent 35373b8b93
commit ce146c8b55
1 changed files with 10 additions and 4 deletions
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14
src/borg/algorithms/checksums.pyx
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@ -25,6 +25,8 @@ cdef extern from "xxh64/xxhash.c":
XXH_OK,
XXH_ERROR
XXH64_state_t* XXH64_createState();
XXH_errorcode XXH64_freeState(XXH64_state_t* statePtr);
XXH64_hash_t XXH64(const void* input, size_t length, unsigned long long seed);
XXH_errorcode XXH64_reset(XXH64_state_t* statePtr, unsigned long long seed);
@ -80,17 +82,21 @@ def xxh64(data, seed=0):
cdef class StreamingXXH64:
cdef XXH64_state_t state
cdef XXH64_state_t* state
def __cinit__(self, seed=0):
self.state = XXH64_createState()
cdef unsigned long long _seed = seed
if XXH64_reset(&self.state, _seed) != XXH_OK:
if XXH64_reset(self.state, _seed) != XXH_OK:
raise Exception('XXH64_reset failed')
def __dealloc__(self):
XXH64_freeState(self.state)
def update(self, data):
cdef Py_buffer data_buf = ro_buffer(data)
try:
if XXH64_update(&self.state, data_buf.buf, data_buf.len) != XXH_OK:
if XXH64_update(self.state, data_buf.buf, data_buf.len) != XXH_OK:
raise Exception('XXH64_update failed')
finally:
PyBuffer_Release(&data_buf)
@ -98,7 +104,7 @@ cdef class StreamingXXH64:
def digest(self):
cdef XXH64_hash_t hash
cdef XXH64_canonical_t digest
hash = XXH64_digest(&self.state)
hash = XXH64_digest(self.state)
XXH64_canonicalFromHash(&digest, hash)
return PyBytes_FromStringAndSize(<const char*> digest.digest, 8)