355 lines
5.9 KiB
C++
Executable File
355 lines
5.9 KiB
C++
Executable File
// 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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#include "precompiled.h"
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#include "lib/types.h"
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#include "lib.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include "sysdep/sysdep.h"
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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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u32 fnv_hash(const void* buf, const size_t len)
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{
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u32 h = 0x811c9dc5u;
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// give distinct values for different length 0 buffers.
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// value taken from FNV; it has no special significance.
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const u8* p = (const u8*)buf;
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// expected case: string
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if(!len)
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{
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while(*p)
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{
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h ^= *p++;
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h *= 0x01000193u;
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}
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}
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else
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{
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size_t bytes_left = len;
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while(bytes_left != 0)
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{
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h ^= *p++;
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h *= 0x01000193u;
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bytes_left--;
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}
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}
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return h;
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}
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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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u64 fnv_hash64(const void* buf, const size_t len)
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{
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u64 h = 0xCBF29CE484222325ull;
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// give distinct values for different length 0 buffers.
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// value taken from FNV; it has no special significance.
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const u8* p = (const u8*)buf;
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// expected case: string
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if(!len)
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{
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while(*p)
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{
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h ^= *p++;
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h *= 0x100000001B3ull;
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}
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}
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else
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{
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size_t bytes_left = len;
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while(bytes_left != 0)
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{
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h ^= *p++;
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h *= 0x100000001B3ull;
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bytes_left--;
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}
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}
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return h;
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}
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// special version for strings: first converts to lowercase
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// (useful for comparing mixed-case filenames).
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// note: still need <len>, e.g. to support non-0-terminated strings
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u32 fnv_lc_hash(const char* str, const size_t len)
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{
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u32 h = 0x811c9dc5u;
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// give distinct values for different length 0 buffers.
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// value taken from FNV; it has no special significance.
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// expected case: string
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if(!len)
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{
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while(*str)
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{
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h ^= tolower(*str++);
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h *= 0x01000193u;
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}
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}
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else
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{
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size_t bytes_left = len;
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while(bytes_left != 0)
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{
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h ^= tolower(*str++);
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h *= 0x01000193u;
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bytes_left--;
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}
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}
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return h;
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}
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bool is_pow2(const long n)
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{
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return (n != 0l) && !(n & (n-1l));
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}
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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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int ilog2(const int n)
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{
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#ifdef _M_IX86
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__asm
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{
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mov ecx, [n]
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or eax, -1 // return value
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lea edx, [ecx-1]
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test ecx, edx // power of 2?
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jnz skip
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bsf eax, ecx
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skip:
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mov [n], eax
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}
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return n;
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#else
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if(n || n & (n-1))
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return -1;
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int i = 1, j = 0;
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for(; i != n; i += i, j++)
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;
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return j;
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#endif
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}
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// return log base 2, rounded up.
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uint log2(uint x)
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{
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uint bit = 1;
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uint l = 0;
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while(bit < x)
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{
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l++;
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bit += bit;
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}
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return l;
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}
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int ilog2(const float x)
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{
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const u32 i = (u32&)x;
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u32 biased_exp = (i >> 23) & 0xff;
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return (int)biased_exp - 127;
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}
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uintptr_t round_up(const uintptr_t n, const uintptr_t multiple)
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{
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if(multiple == 0) // paranoid divide-by-zero
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{
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assert(0);
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return n;
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}
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const uintptr_t padded = n + multiple-1;
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const uintptr_t remainder = padded % multiple;
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const uintptr_t result = padded - remainder;
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assert(n <= result && result < n+multiple);
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return result;
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}
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u16 addusw(u16 x, u16 y)
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{
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u32 t = x;
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return (u16)MIN(t+y, 0xffffu);
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}
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u16 subusw(u16 x, u16 y)
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{
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long t = x;
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return (u16)(MAX(t-y, 0));
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}
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// input in [0, 1); convert to u8 range
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u8 fp_to_u8(double in)
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{
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if(!(0.0 <= in && in < 1.0))
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{
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debug_warn("clampf not in [0,1)");
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return 255;
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}
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int l = (int)(in * 255.0);
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assert((unsigned int)l <= 255u);
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return (u8)l;
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}
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// input in [0, 1); convert to u16 range
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u16 fp_to_u16(double in)
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{
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if(!(0.0 <= in && in < 1.0))
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{
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debug_warn("clampf not in [0,1)");
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return 65535;
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}
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long l = (long)(in * 65535.0);
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assert((unsigned long)l <= 65535u);
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return (u16)l;
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}
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// return random integer in [0, limit).
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// does not use poorly distributed lower bits of rand().
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int rand_up_to(int limit)
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{
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// (i64 avoids overflowing in multiply)
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const i64 ret = ((i64)limit * rand()) / (RAND_MAX+1);
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assert2(0 <= ret && ret < limit);
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return (int)ret;
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}
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// big endian!
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void base32(const int len, const u8* in, u8* out)
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{
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int bits = 0;
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u32 pool = 0;
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static u8 tbl[33] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
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for(int i = 0; i < len; i++)
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{
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if(bits < 5)
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{
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pool <<= 8;
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pool |= *in++;
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bits += 8;
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}
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bits -= 5;
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int c = (pool >> bits) & 31;
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*out++ = tbl[c];
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}
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}
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// case-insensitive check if string <s> matches the pattern <w>,
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// which may contain '?' or '*' wildcards. if so, return 1, otherwise 0.
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// idea from http://www.codeproject.com/string/wildcmp.asp .
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// note: NULL wildcard pattern matches everything!
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int match_wildcard(const char* s, const char* w)
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{
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if(!w)
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return 1;
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// saved position in both strings, used to expand '*':
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// s2 is advanced until match.
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// initially 0 - we abort on mismatch before the first '*'.
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const char* s2 = 0;
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const char* w2 = 0;
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while(*s)
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{
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const int wc = *w;
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if(wc == '*')
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{
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// wildcard string ended with * => match.
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if(*++w == '\0')
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return 1;
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w2 = w;
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s2 = s+1;
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}
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// match one character
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else if(toupper(wc) == toupper(*s) || wc == '?')
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{
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w++;
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s++;
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}
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// mismatched character
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else
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{
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// no '*' found yet => mismatch.
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if(!s2)
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return 0;
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// resume at previous position+1
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w = w2;
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s = s2++;
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}
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}
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// strip trailing * in wildcard string
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while(*w == '*')
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w++;
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return (*w == '\0');
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}
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