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Original source from http://256.com/sources/jenkins_hash_java/
This is a Bob Jenkins hashing algorithm implementation <br> These are functions for producing 32-bit hashes for hash table lookup. hashword(), hashlittle(), hashlittle2(), hashbig(), mix(), and final() are externally useful functions. Routines to test the hash are included if SELF_TEST is defined. You can use this free for any purpose. It's in the public domain. It has no warranty.
01 Syntax
02 Methods
| Name | Overloads | Summary |
|---|---|---|
| byteToLong | 1 | Convert a byte into a long value without making it negative. |
| add | 1 | Do addition and turn into 4 bytes. |
| subtract | 1 | Do subtraction and turn into 4 bytes. |
| xor | 1 | Left shift val by shift bits and turn in 4 bytes. |
| leftShift | 1 | Left shift val by shift bits. |
| fourByteToLong | 1 | Convert 4 bytes from the buffer at offset into a long value. |
| hashMix | 1 | Mix up the values in the hash function. |
| hash | 3 | Hash a variable-length key into a 32-bit value. |
03 Fields
| Name | Overloads | Summary |
|---|---|---|
| MAX_VALUE | 1 | max value to limit it to 4 bytes |
04 Members
SByte)Convert a byte into a long value without making it negative.
| Name | Type | Description |
|---|---|---|
b | SByte | @return |
Int64, Int64)Do addition and turn into 4 bytes.
| Name | Type | Description |
|---|---|---|
val | Int64 | - |
___add | Int64 | @return |
Int64, Int64)Do subtraction and turn into 4 bytes.
| Name | Type | Description |
|---|---|---|
val | Int64 | - |
___subtract | Int64 | @return |
Int64, Int64)Left shift val by shift bits and turn in 4 bytes.
| Name | Type | Description |
|---|---|---|
val | Int64 | - |
___xor | Int64 | @return |
Int64, Int32)Left shift val by shift bits. Cut down to 4 bytes.
| Name | Type | Description |
|---|---|---|
val | Int64 | - |
shift | Int32 | @return |
SByte(), Int32)Convert 4 bytes from the buffer at offset into a long value.
| Name | Type | Description |
|---|---|---|
bytes | SByte() | - |
offset | Int32 | @return |
Int64, Int64, Int64)Mix up the values in the hash function.
SByte(), Int64)Hash a variable-length key into a 32-bit value. Every bit of the key affects every bit of the return value. Every 1-bit and 2-bit delta achieves avalanche. The best hash table sizes are powers of 2.
| Name | Type | Description |
|---|---|---|
buffer | SByte() | Byte array that we are hashing on. |
initialValue | Int64 | Initial value of the hash if we are continuing from a previous run. 0 if none. |
Hash value for the buffer.
SByte())See hash(byte[] buffer, long initialValue)
| Name | Type | Description |
|---|---|---|
buffer | SByte() | Byte array that we are hashing on. |
Hash value for the buffer.
String)只允许ASCII字符串
| Name | Type | Description |
|---|---|---|
key$ | String | - |
max value to limit it to 4 bytes