mirror of https://gitlab.com/yawning/obfs4
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
2.4 KiB
Go
83 lines
2.4 KiB
Go
10 years ago
|
/*
|
||
|
* Copyright (c) 2014, Yawning Angel <yawning at torproject dot org>
|
||
|
* All rights reserved.
|
||
|
*
|
||
|
* Redistribution and use in source and binary forms, with or without
|
||
|
* modification, are permitted provided that the following conditions are met:
|
||
|
*
|
||
|
* * Redistributions of source code must retain the above copyright notice,
|
||
|
* this list of conditions and the following disclaimer.
|
||
|
*
|
||
|
* * Redistributions in binary form must reproduce the above copyright notice,
|
||
|
* this list of conditions and the following disclaimer in the documentation
|
||
|
* and/or other materials provided with the distribution.
|
||
|
*
|
||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
||
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
|
||
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
* POSSIBILITY OF SUCH DAMAGE.
|
||
|
*/
|
||
|
|
||
|
package obfs4
|
||
|
|
||
|
import (
|
||
|
"fmt"
|
||
|
"testing"
|
||
|
|
||
|
"github.com/yawning/obfs4/drbg"
|
||
|
)
|
||
|
|
||
|
const debug = false
|
||
|
|
||
|
func TestWeightedDist(t *testing.T) {
|
||
|
seed, err := drbg.NewSeed()
|
||
|
if err != nil {
|
||
|
t.Fatal("failed to generate a DRBG seed:", err)
|
||
|
}
|
||
|
|
||
|
const nrTrials = 1000000
|
||
|
|
||
|
hist := make([]int, 1000)
|
||
|
|
||
|
w := newWDist(seed, 0, 999)
|
||
|
if debug {
|
||
|
// Dump a string representation of the probability table.
|
||
|
fmt.Println("Table:")
|
||
|
var sum float64
|
||
|
for _, weight := range w.weights {
|
||
|
sum += weight
|
||
|
}
|
||
|
for i, weight := range w.weights {
|
||
|
p := weight / sum
|
||
|
if p > 0.000001 { // Filter out tiny values.
|
||
|
fmt.Printf(" [%d]: %f\n", w.minValue+w.values[i], p)
|
||
|
}
|
||
|
}
|
||
|
fmt.Println()
|
||
|
}
|
||
|
|
||
|
for i := 0; i < nrTrials; i++ {
|
||
|
value := w.sample()
|
||
|
hist[value]++
|
||
|
}
|
||
|
|
||
|
if debug {
|
||
|
fmt.Println("Generated:")
|
||
|
for value, count := range hist {
|
||
|
if count != 0 {
|
||
|
p := float64(count) / float64(nrTrials)
|
||
|
fmt.Printf(" [%d]: %f (%d)\n", value, p, count)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* vim :set ts=4 sw=4 sts=4 noet : */
|