/*End Of SDBM Hash Function*/ unsignedintDJBHash(char* str, unsignedintlen) { unsignedinthash =5381; unsignedinti =0; for(i =0; i < len; str++, i++) { hash = ((hash <<5) + hash) + (*str); } returnhash; } /*End O
#include <stdio.h> #include <string.h> #define HASH_TABLE_SIZE 256 // 一个简单的哈希函数 unsigned int simple_hash(const unsigned char *str) { unsigned int hash = 0; for (int i = 0; str[i] != '\0'; i++) { hash += str[i]; // 这里使用了字符的ASCII值 } return hash % ...
1. /// @brief BKDR Hash Function 2. /// @detail 本 算法由于在Brian Kernighan与Dennis Ritchie的《The C Programming Language》一书被展示而得 名,是一种简单快捷的hash算法,也是Java目前采用的字符串的Hash算法(累乘因子为31)。 3. template<class T> 4. size_t BKDRHash(const T *str) 5. { 6...
if(CertGetNameString( pSignerCert, CERT_NAME_SIMPLE_DISPLAY_TYPE, 0, NULL, pszNameString, MAX_NAME) > 1) { printf("The message signer is %s \n",pszNameString); } else { MyHandleError(L"CertGetNameString failed.\n"); } } else { MyHandleError(L"Cert not found...
以下示例哈希并编码文本消息,然后解码并验证消息。 尽管为简单起见,本示例中已合并了两个不同的函数,但在更现实的设置中,将单独使用这两个部分。 此示例演示了以下任务和 CryptoAPI 函数: 调用CryptAcquireContext以获取 CSP 提供程序。 使用CryptMsgCalculateEncodedLength计算编码消息的长度。
#include<stdlib.h>#include<stdio.h>#include<string.h>#include"hash_tbl.h"/* MurmurHash2, by Austin Appleby* Note - This code makes a few assumptions about how your machine behaves -* 1. We can read a 4-byte value from any address without crashing* 2. sizeof(int) == 4** And it...
Thekomihash()function available in thekomihash.hfile implements a very fast 64-bit hash function, mainly designed for hash-table, hash-map, and bloom-filter uses; produces identical hashes on both big- and little-endian systems. Function's code is portable, cross-platform, scalar, zero-allo...
type GoString struct { Ptr unsafe.Pointer Len int } type GoSlice struct { Ptr unsafe.Pointer Len int Cap int } 2.2 一些高性能 C 代码的方法 既然要用 C 重写热点函数,则有必要给出一些写出高性能 C 代码的方法。考虑通用性,这里列出一些非业务逻辑、算法相关的几种可以提高性能的方法。
If your applications requires hashing tiny strings, then you will not get a speed close to 0.1 cycles per byte. The string should be significantly several times larger than a vector register (128 bits). So clhash is not meant to be a general-purpose hash function. ...
Function The c-bsr hash-length command configures the global hash mask length of a C-BSR. The undo c-bsr hash-length command restores the default configuration. By default, the global hash mask length of a C-BSR is 126. Format c-bsr hash-length hash-length undo c-bsr hash-length ...