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-rw-r--r--src/hash/crc64/crc64.go224
-rw-r--r--src/hash/crc64/crc64_test.go193
2 files changed, 417 insertions, 0 deletions
diff --git a/src/hash/crc64/crc64.go b/src/hash/crc64/crc64.go
new file mode 100644
index 0000000..063c63c
--- /dev/null
+++ b/src/hash/crc64/crc64.go
@@ -0,0 +1,224 @@
+// Copyright 2009 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 crc64 implements the 64-bit cyclic redundancy check, or CRC-64,
+// checksum. See https://en.wikipedia.org/wiki/Cyclic_redundancy_check for
+// information.
+package crc64
+
+import (
+ "errors"
+ "hash"
+ "sync"
+)
+
+// The size of a CRC-64 checksum in bytes.
+const Size = 8
+
+// Predefined polynomials.
+const (
+ // The ISO polynomial, defined in ISO 3309 and used in HDLC.
+ ISO = 0xD800000000000000
+
+ // The ECMA polynomial, defined in ECMA 182.
+ ECMA = 0xC96C5795D7870F42
+)
+
+// Table is a 256-word table representing the polynomial for efficient processing.
+type Table [256]uint64
+
+var (
+ slicing8TablesBuildOnce sync.Once
+ slicing8TableISO *[8]Table
+ slicing8TableECMA *[8]Table
+)
+
+func buildSlicing8TablesOnce() {
+ slicing8TablesBuildOnce.Do(buildSlicing8Tables)
+}
+
+func buildSlicing8Tables() {
+ slicing8TableISO = makeSlicingBy8Table(makeTable(ISO))
+ slicing8TableECMA = makeSlicingBy8Table(makeTable(ECMA))
+}
+
+// MakeTable returns a Table constructed from the specified polynomial.
+// The contents of this Table must not be modified.
+func MakeTable(poly uint64) *Table {
+ buildSlicing8TablesOnce()
+ switch poly {
+ case ISO:
+ return &slicing8TableISO[0]
+ case ECMA:
+ return &slicing8TableECMA[0]
+ default:
+ return makeTable(poly)
+ }
+}
+
+func makeTable(poly uint64) *Table {
+ t := new(Table)
+ for i := 0; i < 256; i++ {
+ crc := uint64(i)
+ for j := 0; j < 8; j++ {
+ if crc&1 == 1 {
+ crc = (crc >> 1) ^ poly
+ } else {
+ crc >>= 1
+ }
+ }
+ t[i] = crc
+ }
+ return t
+}
+
+func makeSlicingBy8Table(t *Table) *[8]Table {
+ var helperTable [8]Table
+ helperTable[0] = *t
+ for i := 0; i < 256; i++ {
+ crc := t[i]
+ for j := 1; j < 8; j++ {
+ crc = t[crc&0xff] ^ (crc >> 8)
+ helperTable[j][i] = crc
+ }
+ }
+ return &helperTable
+}
+
+// digest represents the partial evaluation of a checksum.
+type digest struct {
+ crc uint64
+ tab *Table
+}
+
+// New creates a new hash.Hash64 computing the CRC-64 checksum using the
+// polynomial represented by the Table. Its Sum method will lay the
+// value out in big-endian byte order. The returned Hash64 also
+// implements encoding.BinaryMarshaler and encoding.BinaryUnmarshaler to
+// marshal and unmarshal the internal state of the hash.
+func New(tab *Table) hash.Hash64 { return &digest{0, tab} }
+
+func (d *digest) Size() int { return Size }
+
+func (d *digest) BlockSize() int { return 1 }
+
+func (d *digest) Reset() { d.crc = 0 }
+
+const (
+ magic = "crc\x02"
+ marshaledSize = len(magic) + 8 + 8
+)
+
+func (d *digest) MarshalBinary() ([]byte, error) {
+ b := make([]byte, 0, marshaledSize)
+ b = append(b, magic...)
+ b = appendUint64(b, tableSum(d.tab))
+ b = appendUint64(b, d.crc)
+ return b, nil
+}
+
+func (d *digest) UnmarshalBinary(b []byte) error {
+ if len(b) < len(magic) || string(b[:len(magic)]) != magic {
+ return errors.New("hash/crc64: invalid hash state identifier")
+ }
+ if len(b) != marshaledSize {
+ return errors.New("hash/crc64: invalid hash state size")
+ }
+ if tableSum(d.tab) != readUint64(b[4:]) {
+ return errors.New("hash/crc64: tables do not match")
+ }
+ d.crc = readUint64(b[12:])
+ return nil
+}
+
+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
+}
+
+func update(crc uint64, tab *Table, p []byte) uint64 {
+ buildSlicing8TablesOnce()
+ crc = ^crc
+ // Table comparison is somewhat expensive, so avoid it for small sizes
+ for len(p) >= 64 {
+ var helperTable *[8]Table
+ if *tab == slicing8TableECMA[0] {
+ helperTable = slicing8TableECMA
+ } else if *tab == slicing8TableISO[0] {
+ helperTable = slicing8TableISO
+ // For smaller sizes creating extended table takes too much time
+ } else if len(p) > 16384 {
+ helperTable = makeSlicingBy8Table(tab)
+ } else {
+ break
+ }
+ // Update using slicing-by-8
+ for len(p) > 8 {
+ crc ^= uint64(p[0]) | uint64(p[1])<<8 | uint64(p[2])<<16 | uint64(p[3])<<24 |
+ uint64(p[4])<<32 | uint64(p[5])<<40 | uint64(p[6])<<48 | uint64(p[7])<<56
+ crc = helperTable[7][crc&0xff] ^
+ helperTable[6][(crc>>8)&0xff] ^
+ helperTable[5][(crc>>16)&0xff] ^
+ helperTable[4][(crc>>24)&0xff] ^
+ helperTable[3][(crc>>32)&0xff] ^
+ helperTable[2][(crc>>40)&0xff] ^
+ helperTable[1][(crc>>48)&0xff] ^
+ helperTable[0][crc>>56]
+ p = p[8:]
+ }
+ }
+ // For reminders or small sizes
+ for _, v := range p {
+ crc = tab[byte(crc)^v] ^ (crc >> 8)
+ }
+ return ^crc
+}
+
+// Update returns the result of adding the bytes in p to the crc.
+func Update(crc uint64, tab *Table, p []byte) uint64 {
+ return update(crc, tab, p)
+}
+
+func (d *digest) Write(p []byte) (n int, err error) {
+ d.crc = update(d.crc, d.tab, p)
+ return len(p), nil
+}
+
+func (d *digest) Sum64() uint64 { return d.crc }
+
+func (d *digest) Sum(in []byte) []byte {
+ s := d.Sum64()
+ return append(in, byte(s>>56), byte(s>>48), byte(s>>40), byte(s>>32), byte(s>>24), byte(s>>16), byte(s>>8), byte(s))
+}
+
+// Checksum returns the CRC-64 checksum of data
+// using the polynomial represented by the Table.
+func Checksum(data []byte, tab *Table) uint64 { return update(0, tab, data) }
+
+// tableSum returns the ISO checksum of table t.
+func tableSum(t *Table) uint64 {
+ var a [2048]byte
+ b := a[:0]
+ if t != nil {
+ for _, x := range t {
+ b = appendUint64(b, x)
+ }
+ }
+ return Checksum(b, MakeTable(ISO))
+}
diff --git a/src/hash/crc64/crc64_test.go b/src/hash/crc64/crc64_test.go
new file mode 100644
index 0000000..9cf602c
--- /dev/null
+++ b/src/hash/crc64/crc64_test.go
@@ -0,0 +1,193 @@
+// Copyright 2009 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 crc64
+
+import (
+ "encoding"
+ "io"
+ "testing"
+)
+
+type test struct {
+ outISO uint64
+ outECMA uint64
+ in string
+ halfStateISO string // ISO marshaled hash state after first half of in written, used by TestGoldenMarshal
+ halfStateECMA string // ECMA marshaled hash state after first half of in written, used by TestGoldenMarshal
+}
+
+var golden = []test{
+ {0x0, 0x0, "", "crc\x02s\xba\x84\x84\xbb\xcd]\xef\x00\x00\x00\x00\x00\x00\x00\x00", "crc\x02`&\x9aR\xe1\xb7\xfee\x00\x00\x00\x00\x00\x00\x00\x00"},
+ {0x3420000000000000, 0x330284772e652b05, "a", "crc\x02s\xba\x84\x84\xbb\xcd]\xef\x00\x00\x00\x00\x00\x00\x00\x00", "crc\x02`&\x9aR\xe1\xb7\xfee\x00\x00\x00\x00\x00\x00\x00\x00"},
+ {0x36c4200000000000, 0xbc6573200e84b046, "ab", "crc\x02s\xba\x84\x84\xbb\xcd]\xef4 \x00\x00\x00\x00\x00\x00", "crc\x02`&\x9aR\xe1\xb7\xfee3\x02\x84w.e+\x05"},
+ {0x3776c42000000000, 0x2cd8094a1a277627, "abc", "crc\x02s\xba\x84\x84\xbb\xcd]\xef4 \x00\x00\x00\x00\x00\x00", "crc\x02`&\x9aR\xe1\xb7\xfee3\x02\x84w.e+\x05"},
+ {0x336776c420000000, 0x3c9d28596e5960ba, "abcd", "crc\x02s\xba\x84\x84\xbb\xcd]\xef6\xc4 \x00\x00\x00\x00\x00", "crc\x02`&\x9aR\xe1\xb7\xfee\xbces \x0e\x84\xb0F"},
+ {0x32d36776c4200000, 0x40bdf58fb0895f2, "abcde", "crc\x02s\xba\x84\x84\xbb\xcd]\xef6\xc4 \x00\x00\x00\x00\x00", "crc\x02`&\x9aR\xe1\xb7\xfee\xbces \x0e\x84\xb0F"},
+ {0x3002d36776c42000, 0xd08e9f8545a700f4, "abcdef", "crc\x02s\xba\x84\x84\xbb\xcd]\xef7v\xc4 \x00\x00\x00\x00", "crc\x02`&\x9aR\xe1\xb7\xfee,\xd8\tJ\x1a'v'"},
+ {0x31b002d36776c420, 0xec20a3a8cc710e66, "abcdefg", "crc\x02s\xba\x84\x84\xbb\xcd]\xef7v\xc4 \x00\x00\x00\x00", "crc\x02`&\x9aR\xe1\xb7\xfee,\xd8\tJ\x1a'v'"},
+ {0xe21b002d36776c4, 0x67b4f30a647a0c59, "abcdefgh", "crc\x02s\xba\x84\x84\xbb\xcd]\xef3gv\xc4 \x00\x00\x00", "crc\x02`&\x9aR\xe1\xb7\xfee<\x9d(YnY`\xba"},
+ {0x8b6e21b002d36776, 0x9966f6c89d56ef8e, "abcdefghi", "crc\x02s\xba\x84\x84\xbb\xcd]\xef3gv\xc4 \x00\x00\x00", "crc\x02`&\x9aR\xe1\xb7\xfee<\x9d(YnY`\xba"},
+ {0x7f5b6e21b002d367, 0x32093a2ecd5773f4, "abcdefghij", "crc\x02s\xba\x84\x84\xbb\xcd]\xef2\xd3gv\xc4 \x00\x00", "crc\x02`&\x9aR\xe1\xb7\xfee\x04\v\xdfX\xfb\b\x95\xf2"},
+ {0x8ec0e7c835bf9cdf, 0x8a0825223ea6d221, "Discard medicine more than two years old.", "crc\x02s\xba\x84\x84\xbb\xcd]\xef\xc6\xc0\f\xac'\x11\x12\xd5", "crc\x02`&\x9aR\xe1\xb7\xfee\xfd%\xc0&\xa0R\xef\x95"},
+ {0xc7db1759e2be5ab4, 0x8562c0ac2ab9a00d, "He who has a shady past knows that nice guys finish last.", "crc\x02s\xba\x84\x84\xbb\xcd]\xef\t\xcb\xd15X[r\t", "crc\x02`&\x9aR\xe1\xb7\xfee\a\x02\xe8|+\xc1\x06\xe3"},
+ {0xfbf9d9603a6fa020, 0x3ee2a39c083f38b4, "I wouldn't marry him with a ten foot pole.", "crc\x02s\xba\x84\x84\xbb\xcd]\xef\x19\xc8d\xbe\x84\x14\x87_", "crc\x02`&\x9aR\xe1\xb7\xfee˷\xd3\xeeG\xdcE\x8c"},
+ {0xeafc4211a6daa0ef, 0x1f603830353e518a, "Free! Free!/A trip/to Mars/for 900/empty jars/Burma Shave", "crc\x02s\xba\x84\x84\xbb\xcd]\xef\xad\x1b*\xc0\xb1\xf3i(", "crc\x02`&\x9aR\xe1\xb7\xfee\xa7\x8a\xdb\xf6\xd2R\t\x96"},
+ {0x3e05b21c7a4dc4da, 0x2fd681d7b2421fd, "The days of the digital watch are numbered. -Tom Stoppard", "crc\x02s\xba\x84\x84\xbb\xcd]\xefv78\x1ak\x02\x8f\xff", "crc\x02`&\x9aR\xe1\xb7\xfeeT\xcbl\x10\xfb\x87K*"},
+ {0x5255866ad6ef28a6, 0x790ef2b16a745a41, "Nepal premier won't resign.", "crc\x02s\xba\x84\x84\xbb\xcd]\xef\xcbf\x11R\xbfh\xde\xc9", "crc\x02`&\x9aR\xe1\xb7\xfee6\x13ُ\x06_\xbd\x9a"},
+ {0x8a79895be1e9c361, 0x3ef8f06daccdcddf, "For every action there is an equal and opposite government program.", "crc\x02s\xba\x84\x84\xbb\xcd]\xef\xf3pV\x01c_Wu", "crc\x02`&\x9aR\xe1\xb7\xfee\xe7\xc6\n\b\x12FL\xa0"},
+ {0x8878963a649d4916, 0x49e41b2660b106d, "His money is twice tainted: 'taint yours and 'taint mine.", "crc\x02s\xba\x84\x84\xbb\xcd]\xefñ\xff\xf1\xe0/Δ", "crc\x02`&\x9aR\xe1\xb7\xfeeOL/\xb1\xec\xa2\x14\x87"},
+ {0xa7b9d53ea87eb82f, 0x561cc0cfa235ac68, "There is no reason for any individual to have a computer in their home. -Ken Olsen, 1977", "crc\x02s\xba\x84\x84\xbb\xcd]\xefݸa\xe1\xb5\xf8\xb9W", "crc\x02`&\x9aR\xe1\xb7\xfee\x87)GQ\x03\xf4K\t"},
+ {0xdb6805c0966a2f9c, 0xd4fe9ef082e69f59, "It's a tiny change to the code and not completely disgusting. - Bob Manchek", "crc\x02s\xba\x84\x84\xbb\xcd]\xefV\xba\x12\x91\x81\x1fNU", "crc\x02`&\x9aR\xe1\xb7\xfee\n\xb8\x81v?\xdeL\xcb"},
+ {0xf3553c65dacdadd2, 0xe3b5e46cd8d63a4d, "size: a.out: bad magic", "crc\x02s\xba\x84\x84\xbb\xcd]\xefG\xad\xbc\xb2\xa8y\xc9\xdc", "crc\x02`&\x9aR\xe1\xb7\xfee\xcc\xce\xe5\xe6\x89p\x01\xb8"},
+ {0x9d5e034087a676b9, 0x865aaf6b94f2a051, "The major problem is with sendmail. -Mark Horton", "crc\x02s\xba\x84\x84\xbb\xcd]\uf8acn\x8aT;&\xd5", "crc\x02`&\x9aR\xe1\xb7\xfeeFf\x9c\x1f\xc9x\xbfa"},
+ {0xa6db2d7f8da96417, 0x7eca10d2f8136eb4, "Give me a rock, paper and scissors and I will move the world. CCFestoon", "crc\x02s\xba\x84\x84\xbb\xcd]\xef\xeb\x18\xbf\xf9}\x91\xe5|", "crc\x02`&\x9aR\xe1\xb7\xfeea\x9e\x05:\xce[\xe7\x19"},
+ {0x325e00cd2fe819f9, 0xd7dd118c98e98727, "If the enemy is within range, then so are you.", "crc\x02s\xba\x84\x84\xbb\xcd]\xef^5k\xd0Aj_{", "crc\x02`&\x9aR\xe1\xb7\xfee\v#\x99\xa8r\x83YR"},
+ {0x88c6600ce58ae4c6, 0x70fb33c119c29318, "It's well we cannot hear the screams/That we create in others' dreams.", "crc\x02s\xba\x84\x84\xbb\xcd]\xef|\xb5\x02\xdcw\x18/\x86", "crc\x02`&\x9aR\xe1\xb7\xfee]\x9d-\xed\x8c\xf9r9"},
+ {0x28c4a3f3b769e078, 0x57c891e39a97d9b7, "You remind me of a TV show, but that's all right: I watch it anyway.", "crc\x02s\xba\x84\x84\xbb\xcd]\xef\x03\x8bd\x1c\xb0_\x16\x98", "crc\x02`&\x9aR\xe1\xb7\xfee\xafW\x98\xaa\"\xe7\xd7|"},
+ {0xa698a34c9d9f1dca, 0xa1f46ba20ad06eb7, "C is as portable as Stonehedge!!", "crc\x02s\xba\x84\x84\xbb\xcd]\xef.P\xe1I\xc6pi\xdc", "crc\x02`&\x9aR\xe1\xb7\xfee֚\x06\x01(\xc0\x1e\x8b"},
+ {0xf6c1e2a8c26c5cfc, 0x7ad25fafa1710407, "Even if I could be Shakespeare, I think I should still choose to be Faraday. - A. Huxley", "crc\x02s\xba\x84\x84\xbb\xcd]\xef\xf7\xa04\x8a\xf2o\xe0;", "crc\x02`&\x9aR\xe1\xb7\xfee<[\xd2%\x9em\x94\x04"},
+ {0xd402559dfe9b70c, 0x73cef1666185c13f, "The fugacity of a constituent in a mixture of gases at a given temperature is proportional to its mole fraction. Lewis-Randall Rule", "crc\x02s\xba\x84\x84\xbb\xcd]\xef\u007f\xae\xb9\xbaX=\x19v", "crc\x02`&\x9aR\xe1\xb7\xfee\xb2˦Y\xc5\xd0G\x03"},
+ {0xdb6efff26aa94946, 0xb41858f73c389602, "How can you write a big system without C++? -Paul Glick", "crc\x02s\xba\x84\x84\xbb\xcd]\xefa\xed$js\xb9\xa5A", "crc\x02`&\x9aR\xe1\xb7\xfeeZm\x96\x8a\xe2\xaf\x13p"},
+ {0xe7fcf1006b503b61, 0x27db187fc15bbc72, "This is a test of the emergency broadcast system.", "crc\x02s\xba\x84\x84\xbb\xcd]\xef}\xee[q\x16\xcb\xe4\x8d", "crc\x02`&\x9aR\xe1\xb7\xfee\xb1\x93] \xeb\xa9am"},
+}
+
+func TestGolden(t *testing.T) {
+ tabISO := MakeTable(ISO)
+ tabECMA := MakeTable(ECMA)
+ for i := 0; i < len(golden); i++ {
+ g := golden[i]
+ c := New(tabISO)
+ io.WriteString(c, g.in)
+ s := c.Sum64()
+ if s != g.outISO {
+ t.Fatalf("ISO crc64(%s) = 0x%x want 0x%x", g.in, s, g.outISO)
+ }
+ c = New(tabECMA)
+ io.WriteString(c, g.in)
+ s = c.Sum64()
+ if s != g.outECMA {
+ t.Fatalf("ECMA crc64(%s) = 0x%x want 0x%x", g.in, s, g.outECMA)
+ }
+ }
+}
+
+func TestGoldenMarshal(t *testing.T) {
+ t.Run("ISO", func(t *testing.T) {
+ table := MakeTable(ISO)
+ for _, g := range golden {
+ h := New(table)
+ h2 := New(table)
+
+ io.WriteString(h, g.in[:len(g.in)/2])
+
+ state, err := h.(encoding.BinaryMarshaler).MarshalBinary()
+ if err != nil {
+ t.Errorf("could not marshal: %v", err)
+ continue
+ }
+
+ if string(state) != g.halfStateISO {
+ t.Errorf("ISO crc64(%q) state = %q, want %q", g.in, state, g.halfStateISO)
+ continue
+ }
+
+ if err := h2.(encoding.BinaryUnmarshaler).UnmarshalBinary(state); err != nil {
+ t.Errorf("could not unmarshal: %v", err)
+ continue
+ }
+
+ io.WriteString(h, g.in[len(g.in)/2:])
+ io.WriteString(h2, g.in[len(g.in)/2:])
+
+ if h.Sum64() != h2.Sum64() {
+ t.Errorf("ISO crc64(%s) = 0x%x != marshaled (0x%x)", g.in, h.Sum64(), h2.Sum64())
+ }
+ }
+ })
+ t.Run("ECMA", func(t *testing.T) {
+ table := MakeTable(ECMA)
+ for _, g := range golden {
+ h := New(table)
+ h2 := New(table)
+
+ io.WriteString(h, g.in[:len(g.in)/2])
+
+ state, err := h.(encoding.BinaryMarshaler).MarshalBinary()
+ if err != nil {
+ t.Errorf("could not marshal: %v", err)
+ continue
+ }
+
+ if string(state) != g.halfStateECMA {
+ t.Errorf("ECMA crc64(%q) state = %q, want %q", g.in, state, g.halfStateECMA)
+ continue
+ }
+
+ if err := h2.(encoding.BinaryUnmarshaler).UnmarshalBinary(state); err != nil {
+ t.Errorf("could not unmarshal: %v", err)
+ continue
+ }
+
+ io.WriteString(h, g.in[len(g.in)/2:])
+ io.WriteString(h2, g.in[len(g.in)/2:])
+
+ if h.Sum64() != h2.Sum64() {
+ t.Errorf("ECMA crc64(%s) = 0x%x != marshaled (0x%x)", g.in, h.Sum64(), h2.Sum64())
+ }
+ }
+ })
+}
+
+func TestMarshalTableMismatch(t *testing.T) {
+ h1 := New(MakeTable(ISO))
+ h2 := New(MakeTable(ECMA))
+
+ state1, err := h1.(encoding.BinaryMarshaler).MarshalBinary()
+ if err != nil {
+ t.Errorf("could not marshal: %v", err)
+ }
+
+ if err := h2.(encoding.BinaryUnmarshaler).UnmarshalBinary(state1); err == nil {
+ t.Errorf("no error when one was expected")
+ }
+}
+
+func bench(b *testing.B, poly uint64, size int64) {
+ b.SetBytes(size)
+ data := make([]byte, size)
+ for i := range data {
+ data[i] = byte(i)
+ }
+ h := New(MakeTable(poly))
+ in := make([]byte, 0, h.Size())
+
+ b.ResetTimer()
+ for i := 0; i < b.N; i++ {
+ h.Reset()
+ h.Write(data)
+ h.Sum(in)
+ }
+}
+
+func BenchmarkCrc64(b *testing.B) {
+ b.Run("ISO64KB", func(b *testing.B) {
+ bench(b, ISO, 64<<10)
+ })
+ b.Run("ISO4KB", func(b *testing.B) {
+ bench(b, ISO, 4<<10)
+ })
+ b.Run("ISO1KB", func(b *testing.B) {
+ bench(b, ISO, 1<<10)
+ })
+ b.Run("ECMA64KB", func(b *testing.B) {
+ bench(b, ECMA, 64<<10)
+ })
+ b.Run("Random64KB", func(b *testing.B) {
+ bench(b, 0x777, 64<<10)
+ })
+ b.Run("Random16KB", func(b *testing.B) {
+ bench(b, 0x777, 16<<10)
+ })
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 16:59:49 +0000