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Include/pyhash.h
59 строк
2 KB
Victor Stinner
gh-111545: Add Include/cpython/pyhash.h header file (#112063)
15 ноя 2023, 03:19
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15 ноя 2023, 03:19
62802b6
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#ifndef Py_HASH_H #define Py_HASH_H #ifdef __cplusplus extern "C" { #endif /* Cutoff for small string DJBX33A optimization in range [1, cutoff). * * About 50% of the strings in a typical Python application are smaller than * 6 to 7 chars. However DJBX33A is vulnerable to hash collision attacks. * NEVER use DJBX33A for long strings! * * A Py_HASH_CUTOFF of 0 disables small string optimization. 32 bit platforms * should use a smaller cutoff because it is easier to create colliding * strings. A cutoff of 7 on 64bit platforms and 5 on 32bit platforms should * provide a decent safety margin. */ #ifndef Py_HASH_CUTOFF # define Py_HASH_CUTOFF 0 #elif (Py_HASH_CUTOFF > 7 || Py_HASH_CUTOFF < 0) # error Py_HASH_CUTOFF must in range 0...7. #endif /* Py_HASH_CUTOFF */ /* Hash algorithm selection * * The values for Py_HASH_* are hard-coded in the * configure script. * * - FNV and SIPHASH* are available on all platforms and architectures. * - With EXTERNAL embedders can provide an alternative implementation with:: * * PyHash_FuncDef PyHash_Func = {...}; * * XXX: Figure out __declspec() for extern PyHash_FuncDef. */ #define Py_HASH_EXTERNAL 0 #define Py_HASH_SIPHASH24 1 #define Py_HASH_FNV 2 #define Py_HASH_SIPHASH13 3 #ifndef Py_HASH_ALGORITHM # ifndef HAVE_ALIGNED_REQUIRED # define Py_HASH_ALGORITHM Py_HASH_SIPHASH13 # else # define Py_HASH_ALGORITHM Py_HASH_FNV # endif /* uint64_t && uint32_t && aligned */ #endif /* Py_HASH_ALGORITHM */ #ifndef Py_LIMITED_API # define Py_CPYTHON_HASH_H # include "cpython/pyhash.h" # undef Py_CPYTHON_HASH_H #endif #ifdef __cplusplus } #endif #endif // !Py_HASH_H