135 lines
2.4 KiB
C
Executable File
135 lines
2.4 KiB
C
Executable File
// miscellany
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//
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// Copyright (c) 2003 Jan Wassenberg
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// Contact info:
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// Jan.Wassenberg@stud.uni-karlsruhe.de
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// http://www.stud.uni-karlsruhe.de/~urkt/
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#ifndef __MISC_H__
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#define __MISC_H__
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#include "types.h"
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#include "config.h"
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// bswap32 is overloaded!
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#ifdef __cplusplus
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//extern "C" {
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#endif
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// FNV1-A hash - good for strings.
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// if len = 0 (default), treat buf as a C-string;
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// otherwise, hash <len> bytes of buf.
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extern u32 fnv_hash(const void* buf, const size_t len = 0);
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extern u64 fnv_hash64(const void* buf, const size_t len);
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// hash (currently FNV) of a filename
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typedef u32 FnHash;
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#ifndef min
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inline int min(int a, int b)
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{
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return (a < b)? a : b;
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}
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inline int max(int a, int b)
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{
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return (a > b)? a : b;
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}
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#endif
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extern u16 addusw(u16 x, u16 y);
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extern u16 subusw(u16 x, u16 y);
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extern u16 bswap16(u16);
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extern u32 bswap32(u32);
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extern void bswap32(const u8* data, int cnt);
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static inline u16 read_le16(const void* p)
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{
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#ifdef BIG_ENDIAN
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const u8* _p = (const u8*)p;
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return (u16)_p[0] | (u16)_p[1] << 8;
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#else
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return *(u16*)p;
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#endif
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}
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static inline u32 read_le32(const void* p)
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{
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#ifdef BIG_ENDIAN
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u32 t = 0;
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for(int i = 0; i < 4; i++)
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{
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t <<= 8;
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t |= *((const u8*)p)++;
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}
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return t;
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#else
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return *(u32*)p;
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#endif
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}
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extern bool is_pow2(long n);
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// return -1 if not an integral power of 2,
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// otherwise the base2 logarithm
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extern int ilog2(const int n);
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extern uintptr_t round_up(uintptr_t val, uintptr_t multiple);
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// provide fminf for non-C99 compilers
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#ifndef HAVE_C99
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extern float fminf(float, float);
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#endif
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extern long round(double);
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extern u16 fp_to_u16(double in);
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// big endian!
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extern void base32(const int len, const u8* in, u8* out);
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#ifndef _WIN32
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char *_itoa(int, char *, int radix);
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char *_ultoa(unsigned long int, char*, int radix);
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char *_ltoa(long, char *, int radix);
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#endif
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#ifdef __cplusplus
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//}
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#endif
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#endif // #ifndef __MISC_H__
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