/usr/include/x86_64-linux-gnu/solv/hash.h is in libsolv0-dev 0.6.11-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | /*
* Copyright (c) 2007, Novell Inc.
*
* This program is licensed under the BSD license, read LICENSE.BSD
* for further information
*/
/*
* hash.h
* generic hash functions
*/
#ifndef LIBSOLV_HASH_H
#define LIBSOLV_HASH_H
#include "pooltypes.h"
#ifdef __cplusplus
extern "C" {
#endif
/* value of a hash */
typedef unsigned int Hashval;
/* inside the hash table, Ids are stored. Hash maps: string -> hash -> Id */
typedef Id *Hashtable;
/* hash chain */
#define HASHCHAIN_START 7
#define HASHCHAIN_NEXT(h, hh, mask) (((h) + (hh)++) & (mask))
/* very simple hash function
* string -> hash
*/
static inline Hashval
strhash(const char *str)
{
Hashval r = 0;
unsigned int c;
while ((c = *(const unsigned char *)str++) != 0)
r += (r << 3) + c;
return r;
}
static inline Hashval
strnhash(const char *str, unsigned len)
{
Hashval r = 0;
unsigned int c;
while (len-- && (c = *(const unsigned char *)str++) != 0)
r += (r << 3) + c;
return r;
}
static inline Hashval
strhash_cont(const char *str, Hashval r)
{
unsigned int c;
while ((c = *(const unsigned char *)str++) != 0)
r += (r << 3) + c;
return r;
}
/* hash for rel
* rel -> hash
*/
static inline Hashval
relhash(Id name, Id evr, int flags)
{
return name + 7 * evr + 13 * flags;
}
/* compute bitmask for value
* returns smallest (2^n-1) > 2 * num
*
* used for Hashtable 'modulo' operation
*/
static inline Hashval
mkmask(unsigned int num)
{
num *= 2;
while (num & (num - 1))
num &= num - 1;
return num * 2 - 1;
}
#ifdef __cplusplus
}
#endif
#endif /* LIBSOLV_HASH_H */
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