add forking script

examples/stadtx/fork.sh

@@ -0,0 +1,16 @@
+#!/bin/bash -ex
+
+baseurl='https://github.com/dgryski/go-stadtx/raw/3c3d9b328c24a9b5ecd370654cd6e9d60a85752d'
+
+dl() {
+    filename=$1
+    url="${baseurl}/${filename}"
+    {
+        echo "// Downloaded from '${url}'. DO NOT EDIT."
+        echo
+        curl -L ${url}
+    } > ${filename}
+}
+
+dl stadtx.go
+dl stadtx_test.go

examples/stadtx/gen.go

@@ -0,0 +1,3 @@
+package stadtx
+
+//go:generate go run asm.go -out stadtx.s -stubs stub.go

examples/stadtx/stadtx.go

@@ -1,3 +1,64 @@
+// Downloaded from 'https://github.com/dgryski/go-stadtx/raw/3c3d9b328c24a9b5ecd370654cd6e9d60a85752d/stadtx.go'. DO NOT EDIT.
+
+// Package stadtx implements Stadtx Hash
+/*
+
+   https://github.com/demerphq/BeagleHash
+
+*/
 package stadtx
 
+func rotl64(x uint64, r uint64) uint64 {
+	return (((x) << (r)) | ((x) >> (64 - r)))
+}
+
+func rotr64(x uint64, r uint64) uint64 {
+	return (((x) >> (r)) | ((x) << (64 - r)))
+}
+
+func scramble64(v, prime uint64) uint64 {
+	v ^= (v >> 13)
+	v ^= (v << 35)
+	v ^= (v >> 30)
+	v *= prime
+	v ^= (v >> 19)
+	v ^= (v << 15)
+	v ^= (v >> 46)
+	return v
+}
+
+func SeedState(seed []uint64) State {
+
+	var state State
+
+	state[0] = seed[0] ^ 0x43f6a8885a308d31
+	state[1] = seed[1] ^ 0x3198a2e03707344a
+	state[2] = seed[0] ^ 0x4093822299f31d00
+	state[3] = seed[1] ^ 0x82efa98ec4e6c894
+
+	if state[0] == 0 {
+		state[0] = 1
+	}
+	if state[1] == 0 {
+		state[1] = 2
+	}
+	if state[2] == 0 {
+		state[2] = 4
+	}
+	if state[3] == 0 {
+		state[3] = 8
+	}
+
+	state[0] = scramble64(state[0], 0x801178846e899d17)
+	state[0] = scramble64(state[0], 0xdd51e5d1c9a5a151)
+	state[1] = scramble64(state[1], 0x93a7d6c8c62e4835)
+	state[1] = scramble64(state[1], 0x803340f36895c2b5)
+	state[2] = scramble64(state[2], 0xbea9344eb7565eeb)
+	state[2] = scramble64(state[2], 0xcd95d1e509b995cd)
+	state[3] = scramble64(state[3], 0x9999791977e30c13)
+	state[3] = scramble64(state[3], 0xaab8b6b05abfc6cd)
+
+	return state
+}
+
 type State [4]uint64

examples/stadtx/stadtx_test.go

@@ -1,25 +1,75 @@
+// Downloaded from 'https://github.com/dgryski/go-stadtx/raw/3c3d9b328c24a9b5ecd370654cd6e9d60a85752d/stadtx_test.go'. DO NOT EDIT.
+
 package stadtx
 
 import (
 	"testing"
-	"testing/quick"
-
-	ref "github.com/dgryski/go-stadtx"
 )
 
-//go:generate go run asm.go -out stadtx.s -stubs stub.go
+/*
 
-func IUT(s State, key []byte) uint64 {
-	return Hash(&s, key)
+#include "stadtx_hash.h"
+#include <stdio.h>
+
+int main()
+{
+
+    U64 v;
+
+    U64 seed_ch[2] = { 0x0001020304050607ULL, 0x08090A0b0C0D0E0F };
+
+    U8 data[128];
+
+    int i;
+
+    printf("var tests = []uint64{\n");
+
+    for (i = 0; i < 128; i++) {
+	data[i] = i;
+	v = stadtx_hash((const U8 *) seed_ch, data, i);
+	printf("0x%016lx,", v);
+        if ((i+1) % 8 == 0) {
+            printf("\n");
+        }
+    }
+
+    printf("}\n");
 }
 
-func Expect(s State, key []byte) uint64 {
-	t := ref.State(s)
-	return ref.Hash(&t, key)
-}
+*/
 
-func TestCmp(t *testing.T) {
-	if err := quick.CheckEqual(IUT, Expect, nil); err != nil {
-		t.Fatal(err)
+func TestHash(t *testing.T) {
+
+	var tests = []uint64{
+		0x0db6608af30c8cc1, 0xe3ffb1e1a2273589, 0xc34df40f05c3d43a, 0xf79284a93cd817cf, 0x178aed7315bcd4b9, 0x48a29a42948da116, 0xa78613b72330a064, 0xa23cd23f7b6eaef7,
+		0x7e4c118aca1d7886, 0x37059645f8797936, 0xcb7197e3253670cb, 0x5dadeebe5a5bc19f, 0x537057981e3f75ad, 0x41d57f7870fbcbf8, 0x7fc3cd6b1bb018c2, 0xbf98dbc2a88c5050,
+		0x4a3b3c5468927570, 0xeb6370986f0a28b4, 0x391b356f563a07a2, 0xdb64e2d15432f18f, 0xc8b1bb6c1c375241, 0xf7f86b2d54859f88, 0x862d58654d669d36, 0x77ffae02015534af,
+		0x8f992c4b37053081, 0x7739d76bb99573e8, 0x91115ce66437eeb0, 0x4fe15afafcdb97cb, 0x1f9b53a41ef68d60, 0x87a23023439dbeac, 0xa91d254b6e408270, 0x92d296f71bd786de,
+		0xe08da31cfd5179ca, 0xcc43972f2a93adcb, 0x33b0b5a0aaaa5eea, 0x572ceb8cbdbab15c, 0xefe041ad84a2e8d4, 0xcc196969c505dace, 0xcdf7e4d013499719, 0xfac29209a057fda0,
+		0x77fd1bf64ee30cf2, 0x0f366d248913d0d0, 0x2821028cc5505b41, 0xa571d04d77ef675e, 0xb795018736480554, 0x0d0ff98c4b3f5f4c, 0x8513745208da7fd2, 0xa564e25dff77eb13,
+		0x4375b88d3d7939b6, 0xa90a25148887f828, 0x60616c6d42f7c235, 0xc4fe22c82a03ff4f, 0x4f5a34c6dbf5b521, 0x2681b8c0acfd9b9f, 0xd9d18ed48f9ed27a, 0x420f9d6d60ef38df,
+		0x4a4b79af1f66d7c8, 0xc4e9504dd72ef0cb, 0x99573e84016395f8, 0x1c3121e8c827dbcb, 0x9d24802464cc1872, 0xf8f6a1ce9fcacd83, 0x3253bd62273249db, 0x5f7f8f09fb38d49d,
+		0x4d8687dd8d08cab1, 0x620daae84bfddb5b, 0x75a617b617f9f0a1, 0xd4da1af4f12745e0, 0x6b36894b4d819ed4, 0xaf630af151c8e494, 0xab5f39b817c3694d, 0x95d9d3368bb48ba1,
+		0x255334a30d6340bb, 0x8fac630af7ca8789, 0xb5ed6726f8453ddc, 0x46901504ec0983d2, 0x28b2ce6c3ca0c1ea, 0x1dd3519df8229928, 0x26e3a6a8c6358f66, 0x6158403905bed2ea,
+		0x4305ff8110eae857, 0x242b67463b95498c, 0x068a9ca66b87878f, 0x7ae1ecb47838c849, 0x11008d3f1dcaf002, 0x0913b479903c3ef3, 0x9e94d283f9ac4e75, 0xb0abae509c13b987,
+		0x66a4f4534050428b, 0x84b82a6f343a8fcd, 0xa9c418edf1f127e5, 0x2b990abfcedb6724, 0x6b47931cb943f52f, 0x4c04efa93ea2e780, 0xf21e88b212e8c44b, 0x086f4fe25e8a9eda,
+		0x707bc1c224794651, 0x88d1a9194b06112f, 0x09935bcf7618afad, 0x750fe3517d46e8f5, 0xeac04dfd871b8393, 0x0861101436a7d359, 0x1e971720b0c00991, 0x8f7eb2608c40a30c,
+		0xb2e142a7da8288e9, 0x320949b842c373dc, 0xa2edee4716e95cbc, 0x1fd86a7a946d7e01, 0xd4b9d24e8936b228, 0x5ab2d7cab3834f7a, 0x9ae42d7a8b241d00, 0xf9dc368e8df9bb11,
+		0x3e538bcf908bc657, 0x1f621c025155d15a, 0x2878d0e561531226, 0x9fb44daf75b7698e, 0xf19125829320cd64, 0x72965e1625d10cb9, 0x493679ecc71d278c, 0x563ef209b56abc24,
+		0xb6d39808be0528cd, 0xdb1d268d396264ee, 0xd68ce668d90aeed7, 0x1fcb217fa263821f, 0x9015c4b806730fd9, 0xf870f30533d0109d, 0x1688ab70df2abf39, 0x3a891995e76992bd,
+	}
+
+	seed := []uint64{0x0001020304050607, 0x08090A0B0C0D0E0F}
+
+	state := SeedState(seed)
+
+	input := make([]byte, 128)
+
+	for i := range input {
+		input[i] = byte(i)
+
+		if h := Hash(&state, input[:i]); h != tests[i] {
+			t.Errorf("Hash(..., input[:%d])=%016x, want %016x\n", i, h, tests[i])
+		}
 	}
 }