From 38ee83e45b4de7edf89bf9f0ef629eb4c6ad0fa8 Mon Sep 17 00:00:00 2001
From: Christopher Speller <crspeller@gmail.com>
Date: Thu, 12 May 2016 23:56:07 -0400
Subject: Moving to glide

---
 .../github.com/mattermost/rsc/gf256/gf256_test.go  | 194 +++++++++++++++++++++
 1 file changed, 194 insertions(+)
 create mode 100644 vendor/github.com/mattermost/rsc/gf256/gf256_test.go

(limited to 'vendor/github.com/mattermost/rsc/gf256/gf256_test.go')

diff --git a/vendor/github.com/mattermost/rsc/gf256/gf256_test.go b/vendor/github.com/mattermost/rsc/gf256/gf256_test.go
new file mode 100644
index 000000000..f77fa7d67
--- /dev/null
+++ b/vendor/github.com/mattermost/rsc/gf256/gf256_test.go
@@ -0,0 +1,194 @@
+// Copyright 2010 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 gf256
+
+import (
+	"bytes"
+	"fmt"
+	"testing"
+)
+
+var f = NewField(0x11d, 2) // x^8 + x^4 + x^3 + x^2 + 1
+
+func TestBasic(t *testing.T) {
+	if f.Exp(0) != 1 || f.Exp(1) != 2 || f.Exp(255) != 1 {
+		panic("bad Exp")
+	}
+}
+
+func TestECC(t *testing.T) {
+	data := []byte{0x10, 0x20, 0x0c, 0x56, 0x61, 0x80, 0xec, 0x11, 0xec, 0x11, 0xec, 0x11, 0xec, 0x11, 0xec, 0x11}
+	check := []byte{0xa5, 0x24, 0xd4, 0xc1, 0xed, 0x36, 0xc7, 0x87, 0x2c, 0x55}
+	out := make([]byte, len(check))
+	rs := NewRSEncoder(f, len(check))
+	rs.ECC(data, out)
+	if !bytes.Equal(out, check) {
+		t.Errorf("have %x want %x", out, check)
+	}
+}
+
+func TestLinear(t *testing.T) {
+	d1 := []byte{0x00, 0x00}
+	c1 := []byte{0x00, 0x00}
+	out := make([]byte, len(c1))
+	rs := NewRSEncoder(f, len(c1))
+	if rs.ECC(d1, out); !bytes.Equal(out, c1) {
+		t.Errorf("ECBytes(%x, %d) = %x, want 0", d1, len(c1), out)
+	}
+	d2 := []byte{0x00, 0x01}
+	c2 := make([]byte, 2)
+	rs.ECC(d2, c2)
+	d3 := []byte{0x00, 0x02}
+	c3 := make([]byte, 2)
+	rs.ECC(d3, c3)
+	cx := make([]byte, 2)
+	for i := range cx {
+		cx[i] = c2[i] ^ c3[i]
+	}
+	d4 := []byte{0x00, 0x03}
+	c4 := make([]byte, 2)
+	rs.ECC(d4, c4)
+	if !bytes.Equal(cx, c4) {
+		t.Errorf("ECBytes(%x, 2) = %x\nECBytes(%x, 2) = %x\nxor = %x\nECBytes(%x, 2) = %x",
+			d2, c2, d3, c3, cx, d4, c4)
+	}
+}
+
+func TestGaussJordan(t *testing.T) {
+	rs := NewRSEncoder(f, 2)
+	m := make([][]byte, 16)
+	for i := range m {
+		m[i] = make([]byte, 4)
+		m[i][i/8] = 1 << uint(i%8)
+		rs.ECC(m[i][:2], m[i][2:])
+	}
+	if false {
+		fmt.Printf("---\n")
+		for _, row := range m {
+			fmt.Printf("%x\n", row)
+		}
+	}
+	b := []uint{0, 1, 2, 3, 12, 13, 14, 15, 20, 21, 22, 23, 24, 25, 26, 27}
+	for i := 0; i < 16; i++ {
+		bi := b[i]
+		if m[i][bi/8]&(1<<(7-bi%8)) == 0 {
+			for j := i + 1; ; j++ {
+				if j >= len(m) {
+					t.Errorf("lost track for %d", bi)
+					break
+				}
+				if m[j][bi/8]&(1<<(7-bi%8)) != 0 {
+					m[i], m[j] = m[j], m[i]
+					break
+				}
+			}
+		}
+		for j := i + 1; j < len(m); j++ {
+			if m[j][bi/8]&(1<<(7-bi%8)) != 0 {
+				for k := range m[j] {
+					m[j][k] ^= m[i][k]
+				}
+			}
+		}
+	}
+	if false {
+		fmt.Printf("---\n")
+		for _, row := range m {
+			fmt.Printf("%x\n", row)
+		}
+	}
+	for i := 15; i >= 0; i-- {
+		bi := b[i]
+		for j := i - 1; j >= 0; j-- {
+			if m[j][bi/8]&(1<<(7-bi%8)) != 0 {
+				for k := range m[j] {
+					m[j][k] ^= m[i][k]
+				}
+			}
+		}
+	}
+	if false {
+		fmt.Printf("---\n")
+		for _, row := range m {
+			fmt.Printf("%x", row)
+			out := make([]byte, 2)
+			if rs.ECC(row[:2], out); !bytes.Equal(out, row[2:]) {
+				fmt.Printf(" - want %x", out)
+			}
+			fmt.Printf("\n")
+		}
+	}
+}
+
+func BenchmarkECC(b *testing.B) {
+	data := []byte{0x10, 0x20, 0x0c, 0x56, 0x61, 0x80, 0xec, 0x11, 0xec, 0x11, 0xec, 0x11, 0xec, 0x11, 0xec, 0x11, 0x10, 0x20, 0x0c, 0x56, 0x61, 0x80, 0xec, 0x11, 0xec, 0x11, 0xec, 0x11, 0xec, 0x11, 0xec, 0x11}
+	check := []byte{0x29, 0x41, 0xb3, 0x93, 0x8, 0xe8, 0xa3, 0xe7, 0x63, 0x8f}
+	out := make([]byte, len(check))
+	rs := NewRSEncoder(f, len(check))
+	for i := 0; i < b.N; i++ {
+		rs.ECC(data, out)
+	}
+	b.SetBytes(int64(len(data)))
+	if !bytes.Equal(out, check) {
+		fmt.Printf("have %#v want %#v\n", out, check)
+	}
+}
+
+func TestGen(t *testing.T) {
+	for i := 0; i < 256; i++ {
+		_, lg := f.gen(i)
+		if lg[0] != 0 {
+			t.Errorf("#%d: %x", i, lg)
+		}
+	}
+}
+
+func TestReducible(t *testing.T) {
+	var count = []int{1, 2, 3, 6, 9, 18, 30, 56, 99, 186} // oeis.org/A1037
+	for i, want := range count {
+		n := 0
+		for p := 1 << uint(i+2); p < 1<<uint(i+3); p++ {
+			if !reducible(p) {
+				n++
+			}
+		}
+		if n != want {
+			t.Errorf("#reducible(%d-bit) = %d, want %d", i+2, n, want)
+		}
+	}
+}
+
+func TestExhaustive(t *testing.T) {
+	for poly := 0x100; poly < 0x200; poly++ {
+		if reducible(poly) {
+			continue
+		}
+		α := 2
+		for !generates(α, poly) {
+			α++
+		}
+		f := NewField(poly, α)
+		for p := 0; p < 256; p++ {
+			for q := 0; q < 256; q++ {
+				fm := int(f.Mul(byte(p), byte(q)))
+				pm := mul(p, q, poly)
+				if fm != pm {
+					t.Errorf("NewField(%#x).Mul(%#x, %#x) = %#x, want %#x", poly, p, q, fm, pm)
+				}
+			}
+		}
+	}
+}
+
+func generates(α, poly int) bool {
+	x := α
+	for i := 0; i < 254; i++ {
+		if x == 1 {
+			return false
+		}
+		x = mul(x, α, poly)
+	}
+	return true
+}
-- 
cgit v1.2.3-1-g7c22