Adding upstream version 1.16.10.upstream/1.16.10upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 371 insertions, 0 deletions

diff --git a/src/hash/fnv/fnv.go b/src/hash/fnv/fnv.go
new file mode 100644
index 0000000..0fce177
--- /dev/null
+++ b/src/hash/fnv/fnv.go
@@ -0,0 +1,371 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package fnv implements FNV-1 and FNV-1a, non-cryptographic hash functions
+// created by Glenn Fowler, Landon Curt Noll, and Phong Vo.
+// See
+// https://en.wikipedia.org/wiki/Fowler-Noll-Vo_hash_function.
+//
+// All the hash.Hash implementations returned by this package also
+// implement encoding.BinaryMarshaler and encoding.BinaryUnmarshaler to
+// marshal and unmarshal the internal state of the hash.
+package fnv
+
+import (
+	"errors"
+	"hash"
+	"math/bits"
+)
+
+type (
+	sum32   uint32
+	sum32a  uint32
+	sum64   uint64
+	sum64a  uint64
+	sum128  [2]uint64
+	sum128a [2]uint64
+)
+
+const (
+	offset32        = 2166136261
+	offset64        = 14695981039346656037
+	offset128Lower  = 0x62b821756295c58d
+	offset128Higher = 0x6c62272e07bb0142
+	prime32         = 16777619
+	prime64         = 1099511628211
+	prime128Lower   = 0x13b
+	prime128Shift   = 24
+)
+
+// New32 returns a new 32-bit FNV-1 hash.Hash.
+// Its Sum method will lay the value out in big-endian byte order.
+func New32() hash.Hash32 {
+	var s sum32 = offset32
+	return &s
+}
+
+// New32a returns a new 32-bit FNV-1a hash.Hash.
+// Its Sum method will lay the value out in big-endian byte order.
+func New32a() hash.Hash32 {
+	var s sum32a = offset32
+	return &s
+}
+
+// New64 returns a new 64-bit FNV-1 hash.Hash.
+// Its Sum method will lay the value out in big-endian byte order.
+func New64() hash.Hash64 {
+	var s sum64 = offset64
+	return &s
+}
+
+// New64a returns a new 64-bit FNV-1a hash.Hash.
+// Its Sum method will lay the value out in big-endian byte order.
+func New64a() hash.Hash64 {
+	var s sum64a = offset64
+	return &s
+}
+
+// New128 returns a new 128-bit FNV-1 hash.Hash.
+// Its Sum method will lay the value out in big-endian byte order.
+func New128() hash.Hash {
+	var s sum128
+	s[0] = offset128Higher
+	s[1] = offset128Lower
+	return &s
+}
+
+// New128a returns a new 128-bit FNV-1a hash.Hash.
+// Its Sum method will lay the value out in big-endian byte order.
+func New128a() hash.Hash {
+	var s sum128a
+	s[0] = offset128Higher
+	s[1] = offset128Lower
+	return &s
+}
+
+func (s *sum32) Reset()   { *s = offset32 }
+func (s *sum32a) Reset()  { *s = offset32 }
+func (s *sum64) Reset()   { *s = offset64 }
+func (s *sum64a) Reset()  { *s = offset64 }
+func (s *sum128) Reset()  { s[0] = offset128Higher; s[1] = offset128Lower }
+func (s *sum128a) Reset() { s[0] = offset128Higher; s[1] = offset128Lower }
+
+func (s *sum32) Sum32() uint32  { return uint32(*s) }
+func (s *sum32a) Sum32() uint32 { return uint32(*s) }
+func (s *sum64) Sum64() uint64  { return uint64(*s) }
+func (s *sum64a) Sum64() uint64 { return uint64(*s) }
+
+func (s *sum32) Write(data []byte) (int, error) {
+	hash := *s
+	for _, c := range data {
+		hash *= prime32
+		hash ^= sum32(c)
+	}
+	*s = hash
+	return len(data), nil
+}
+
+func (s *sum32a) Write(data []byte) (int, error) {
+	hash := *s
+	for _, c := range data {
+		hash ^= sum32a(c)
+		hash *= prime32
+	}
+	*s = hash
+	return len(data), nil
+}
+
+func (s *sum64) Write(data []byte) (int, error) {
+	hash := *s
+	for _, c := range data {
+		hash *= prime64
+		hash ^= sum64(c)
+	}
+	*s = hash
+	return len(data), nil
+}
+
+func (s *sum64a) Write(data []byte) (int, error) {
+	hash := *s
+	for _, c := range data {
+		hash ^= sum64a(c)
+		hash *= prime64
+	}
+	*s = hash
+	return len(data), nil
+}
+
+func (s *sum128) Write(data []byte) (int, error) {
+	for _, c := range data {
+		// Compute the multiplication
+		s0, s1 := bits.Mul64(prime128Lower, s[1])
+		s0 += s[1]<<prime128Shift + prime128Lower*s[0]
+		// Update the values
+		s[1] = s1
+		s[0] = s0
+		s[1] ^= uint64(c)
+	}
+	return len(data), nil
+}
+
+func (s *sum128a) Write(data []byte) (int, error) {
+	for _, c := range data {
+		s[1] ^= uint64(c)
+		// Compute the multiplication
+		s0, s1 := bits.Mul64(prime128Lower, s[1])
+		s0 += s[1]<<prime128Shift + prime128Lower*s[0]
+		// Update the values
+		s[1] = s1
+		s[0] = s0
+	}
+	return len(data), nil
+}
+
+func (s *sum32) Size() int   { return 4 }
+func (s *sum32a) Size() int  { return 4 }
+func (s *sum64) Size() int   { return 8 }
+func (s *sum64a) Size() int  { return 8 }
+func (s *sum128) Size() int  { return 16 }
+func (s *sum128a) Size() int { return 16 }
+
+func (s *sum32) BlockSize() int   { return 1 }
+func (s *sum32a) BlockSize() int  { return 1 }
+func (s *sum64) BlockSize() int   { return 1 }
+func (s *sum64a) BlockSize() int  { return 1 }
+func (s *sum128) BlockSize() int  { return 1 }
+func (s *sum128a) BlockSize() int { return 1 }
+
+func (s *sum32) Sum(in []byte) []byte {
+	v := uint32(*s)
+	return append(in, byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
+}
+
+func (s *sum32a) Sum(in []byte) []byte {
+	v := uint32(*s)
+	return append(in, byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
+}
+
+func (s *sum64) Sum(in []byte) []byte {
+	v := uint64(*s)
+	return append(in, byte(v>>56), byte(v>>48), byte(v>>40), byte(v>>32), byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
+}
+
+func (s *sum64a) Sum(in []byte) []byte {
+	v := uint64(*s)
+	return append(in, byte(v>>56), byte(v>>48), byte(v>>40), byte(v>>32), byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
+}
+
+func (s *sum128) Sum(in []byte) []byte {
+	return append(in,
+		byte(s[0]>>56), byte(s[0]>>48), byte(s[0]>>40), byte(s[0]>>32), byte(s[0]>>24), byte(s[0]>>16), byte(s[0]>>8), byte(s[0]),
+		byte(s[1]>>56), byte(s[1]>>48), byte(s[1]>>40), byte(s[1]>>32), byte(s[1]>>24), byte(s[1]>>16), byte(s[1]>>8), byte(s[1]),
+	)
+}
+
+func (s *sum128a) Sum(in []byte) []byte {
+	return append(in,
+		byte(s[0]>>56), byte(s[0]>>48), byte(s[0]>>40), byte(s[0]>>32), byte(s[0]>>24), byte(s[0]>>16), byte(s[0]>>8), byte(s[0]),
+		byte(s[1]>>56), byte(s[1]>>48), byte(s[1]>>40), byte(s[1]>>32), byte(s[1]>>24), byte(s[1]>>16), byte(s[1]>>8), byte(s[1]),
+	)
+}
+
+const (
+	magic32          = "fnv\x01"
+	magic32a         = "fnv\x02"
+	magic64          = "fnv\x03"
+	magic64a         = "fnv\x04"
+	magic128         = "fnv\x05"
+	magic128a        = "fnv\x06"
+	marshaledSize32  = len(magic32) + 4
+	marshaledSize64  = len(magic64) + 8
+	marshaledSize128 = len(magic128) + 8*2
+)
+
+func (s *sum32) MarshalBinary() ([]byte, error) {
+	b := make([]byte, 0, marshaledSize32)
+	b = append(b, magic32...)
+	b = appendUint32(b, uint32(*s))
+	return b, nil
+}
+
+func (s *sum32a) MarshalBinary() ([]byte, error) {
+	b := make([]byte, 0, marshaledSize32)
+	b = append(b, magic32a...)
+	b = appendUint32(b, uint32(*s))
+	return b, nil
+}
+
+func (s *sum64) MarshalBinary() ([]byte, error) {
+	b := make([]byte, 0, marshaledSize64)
+	b = append(b, magic64...)
+	b = appendUint64(b, uint64(*s))
+	return b, nil
+
+}
+
+func (s *sum64a) MarshalBinary() ([]byte, error) {
+	b := make([]byte, 0, marshaledSize64)
+	b = append(b, magic64a...)
+	b = appendUint64(b, uint64(*s))
+	return b, nil
+}
+
+func (s *sum128) MarshalBinary() ([]byte, error) {
+	b := make([]byte, 0, marshaledSize128)
+	b = append(b, magic128...)
+	b = appendUint64(b, s[0])
+	b = appendUint64(b, s[1])
+	return b, nil
+}
+
+func (s *sum128a) MarshalBinary() ([]byte, error) {
+	b := make([]byte, 0, marshaledSize128)
+	b = append(b, magic128a...)
+	b = appendUint64(b, s[0])
+	b = appendUint64(b, s[1])
+	return b, nil
+}
+
+func (s *sum32) UnmarshalBinary(b []byte) error {
+	if len(b) < len(magic32) || string(b[:len(magic32)]) != magic32 {
+		return errors.New("hash/fnv: invalid hash state identifier")
+	}
+	if len(b) != marshaledSize32 {
+		return errors.New("hash/fnv: invalid hash state size")
+	}
+	*s = sum32(readUint32(b[4:]))
+	return nil
+}
+
+func (s *sum32a) UnmarshalBinary(b []byte) error {
+	if len(b) < len(magic32a) || string(b[:len(magic32a)]) != magic32a {
+		return errors.New("hash/fnv: invalid hash state identifier")
+	}
+	if len(b) != marshaledSize32 {
+		return errors.New("hash/fnv: invalid hash state size")
+	}
+	*s = sum32a(readUint32(b[4:]))
+	return nil
+}
+
+func (s *sum64) UnmarshalBinary(b []byte) error {
+	if len(b) < len(magic64) || string(b[:len(magic64)]) != magic64 {
+		return errors.New("hash/fnv: invalid hash state identifier")
+	}
+	if len(b) != marshaledSize64 {
+		return errors.New("hash/fnv: invalid hash state size")
+	}
+	*s = sum64(readUint64(b[4:]))
+	return nil
+}
+
+func (s *sum64a) UnmarshalBinary(b []byte) error {
+	if len(b) < len(magic64a) || string(b[:len(magic64a)]) != magic64a {
+		return errors.New("hash/fnv: invalid hash state identifier")
+	}
+	if len(b) != marshaledSize64 {
+		return errors.New("hash/fnv: invalid hash state size")
+	}
+	*s = sum64a(readUint64(b[4:]))
+	return nil
+}
+
+func (s *sum128) UnmarshalBinary(b []byte) error {
+	if len(b) < len(magic128) || string(b[:len(magic128)]) != magic128 {
+		return errors.New("hash/fnv: invalid hash state identifier")
+	}
+	if len(b) != marshaledSize128 {
+		return errors.New("hash/fnv: invalid hash state size")
+	}
+	s[0] = readUint64(b[4:])
+	s[1] = readUint64(b[12:])
+	return nil
+}
+
+func (s *sum128a) UnmarshalBinary(b []byte) error {
+	if len(b) < len(magic128a) || string(b[:len(magic128a)]) != magic128a {
+		return errors.New("hash/fnv: invalid hash state identifier")
+	}
+	if len(b) != marshaledSize128 {
+		return errors.New("hash/fnv: invalid hash state size")
+	}
+	s[0] = readUint64(b[4:])
+	s[1] = readUint64(b[12:])
+	return nil
+}
+
+func readUint32(b []byte) uint32 {
+	_ = b[3]
+	return uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
+}
+
+func appendUint32(b []byte, x uint32) []byte {
+	a := [4]byte{
+		byte(x >> 24),
+		byte(x >> 16),
+		byte(x >> 8),
+		byte(x),
+	}
+	return append(b, a[:]...)
+}
+
+func appendUint64(b []byte, x uint64) []byte {
+	a := [8]byte{
+		byte(x >> 56),
+		byte(x >> 48),
+		byte(x >> 40),
+		byte(x >> 32),
+		byte(x >> 24),
+		byte(x >> 16),
+		byte(x >> 8),
+		byte(x),
+	}
+	return append(b, a[:]...)
+}
+
+func readUint64(b []byte) uint64 {
+	_ = b[7]
+	return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
+		uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
+}