Hash

include: co/hash.h.

#Hash

#hash32

uint32 hash32(const char* s);
uint32 hash32(const fastring& s)
uint32 hash32(const std::string& s);
uint32 hash32(const void* s, size_t n);
  • This function returns a 32-bit murmur hash value.
  • When s is a pointer, it is generally required to be byte-aligned by sizeof(void*).

#hash64

uint64 hash64(const void* s, size_t n);
uint64 hash64(const char* s);
uint64 hash64(const fastring& s);
uint64 hash64(const std::string& s);
  • This function returns a 64-bit murmur hash value.
  • When s is a pointer, it is generally required to be 8-byte aligned.

#murmur_hash

size_t murmur_hash(const void* s, size_t n);
  • This function returns a hash value of size_t type. This value is 64-bit on 64-bit platform and 32-bit on 32-bit platform.
  • The parameter s is generally required to be sizeof(void*) byte-aligned.

#md5sum

fastring md5sum(const void* s, size_t n);
fastring md5sum(const char* s);
fastring md5sum(const fastring& s);
fastring md5sum(const std::string& s);
  • This function calculates the md5 value of a string and returns a 32-byte string containing only hexadecimal characters.

#crc16

uint16_t crc16(const void* s, size_t n);
uint16_t crc16(const char* s);
uint16_t crc16(const fastring& s);
uint16_t crc16(const std::string& s);
  • This function calculates the crc16 value of a string. The implementation is taken from redis and will be used when implementing the redis cluster client.

#base64_encode

fastring base64_encode(const void* s, size_t n);
fastring base64_encode(const char* s);
fastring base64_encode(const fastring& s);
fastring base64_encode(const std::string& s);
  • base64 encoding, \r\n is not added in the implementation.

#base64_decode

fastring base64_decode(const void* s, size_t n);
fastring base64_decode(const char* s);
fastring base64_decode(const fastring& s);
fastring base64_decode(const std::string& s);
  • base64 decoding, if the input is not reasonable base64-encoded data, the decoding will fail and an empty string will be returned.

#url_encode

fastring url_encode(const void* s, size_t n);
fastring url_encode(const char* s);
fastring url_encode(const fastring& s);
fastring url_encode(const std::string& s);
  • url encoding, reserved characters !()*#$&'+,/:;=?@[] and a-z A-Z 0-9 -_.~ will not be encoded, all other characters will be encoded.

#url_decode

fastring url_decode(const void* s, size_t n);
fastring url_decode(const char* s);
fastring url_decode(const fastring& s);
fastring url_decode(const std::string& s);
  • url decoding, if the input is not a reasonably encoded url, the decoding will fail and an empty string will be returned.