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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [hash/] [fnv/] [fnv.go] - Blame information for rev 747

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1 747 jeremybenn 
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package fnv implements FNV-1 and FNV-1a, non-cryptographic hash functions
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// created by Glenn Fowler, Landon Curt Noll, and Phong Vo.
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// See http://isthe.com/chongo/tech/comp/fnv/.
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package fnv
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import (
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        "hash"
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)
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type (
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        sum32  uint32
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        sum32a uint32
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        sum64  uint64
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        sum64a uint64
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)
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const (
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        offset32 = 2166136261
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        offset64 = 14695981039346656037
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        prime32  = 16777619
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        prime64  = 1099511628211
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)
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// New32 returns a new 32-bit FNV-1 hash.Hash.
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func New32() hash.Hash32 {
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        var s sum32 = offset32
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        return &s
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}
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// New32a returns a new 32-bit FNV-1a hash.Hash.
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func New32a() hash.Hash32 {
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        var s sum32a = offset32
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        return &s
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}
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// New64 returns a new 64-bit FNV-1 hash.Hash.
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func New64() hash.Hash64 {
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        var s sum64 = offset64
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        return &s
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}
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// New64a returns a new 64-bit FNV-1a hash.Hash.
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func New64a() hash.Hash64 {
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        var s sum64a = offset64
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        return &s
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}
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func (s *sum32) Reset()  { *s = offset32 }
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func (s *sum32a) Reset() { *s = offset32 }
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func (s *sum64) Reset()  { *s = offset64 }
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func (s *sum64a) Reset() { *s = offset64 }
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func (s *sum32) Sum32() uint32  { return uint32(*s) }
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func (s *sum32a) Sum32() uint32 { return uint32(*s) }
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func (s *sum64) Sum64() uint64  { return uint64(*s) }
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func (s *sum64a) Sum64() uint64 { return uint64(*s) }
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func (s *sum32) Write(data []byte) (int, error) {
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        hash := *s
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        for _, c := range data {
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                hash *= prime32
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                hash ^= sum32(c)
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        }
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        *s = hash
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        return len(data), nil
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}
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func (s *sum32a) Write(data []byte) (int, error) {
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        hash := *s
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        for _, c := range data {
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                hash ^= sum32a(c)
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                hash *= prime32
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        }
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        *s = hash
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        return len(data), nil
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}
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func (s *sum64) Write(data []byte) (int, error) {
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        hash := *s
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        for _, c := range data {
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                hash *= prime64
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                hash ^= sum64(c)
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        }
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        *s = hash
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        return len(data), nil
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}
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func (s *sum64a) Write(data []byte) (int, error) {
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        hash := *s
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        for _, c := range data {
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                hash ^= sum64a(c)
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                hash *= prime64
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        }
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        *s = hash
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        return len(data), nil
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}
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func (s *sum32) Size() int  { return 4 }
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func (s *sum32a) Size() int { return 4 }
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func (s *sum64) Size() int  { return 8 }
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func (s *sum64a) Size() int { return 8 }
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func (s *sum32) BlockSize() int  { return 1 }
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func (s *sum32a) BlockSize() int { return 1 }
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func (s *sum64) BlockSize() int  { return 1 }
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func (s *sum64a) BlockSize() int { return 1 }
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func (s *sum32) Sum(in []byte) []byte {
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        v := uint32(*s)
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        in = append(in, byte(v>>24))
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        in = append(in, byte(v>>16))
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        in = append(in, byte(v>>8))
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        in = append(in, byte(v))
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        return in
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}
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func (s *sum32a) Sum(in []byte) []byte {
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        v := uint32(*s)
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        in = append(in, byte(v>>24))
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        in = append(in, byte(v>>16))
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        in = append(in, byte(v>>8))
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        in = append(in, byte(v))
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        return in
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}
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func (s *sum64) Sum(in []byte) []byte {
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        v := uint64(*s)
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        in = append(in, byte(v>>56))
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        in = append(in, byte(v>>48))
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        in = append(in, byte(v>>40))
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        in = append(in, byte(v>>32))
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        in = append(in, byte(v>>24))
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        in = append(in, byte(v>>16))
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        in = append(in, byte(v>>8))
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        in = append(in, byte(v))
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        return in
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}
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func (s *sum64a) Sum(in []byte) []byte {
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        v := uint64(*s)
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        in = append(in, byte(v>>56))
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        in = append(in, byte(v>>48))
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        in = append(in, byte(v>>40))
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        in = append(in, byte(v>>32))
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        in = append(in, byte(v>>24))
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        in = append(in, byte(v>>16))
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        in = append(in, byte(v>>8))
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        in = append(in, byte(v))
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        return in
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}

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