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spamsumwriter_test.go
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/
spamsumwriter_test.go
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// Copyright 2013, Michiel Buddingh, All rights reserved.
// Use of this code is governed by version 2.0 or later of the Apache
// License, available at http://www.apache.org/licenses/LICENSE-2.0
package spamsum
import (
"bufio"
"encoding/binary"
"math/rand"
"os"
"path/filepath"
"testing"
)
func TestWriter(t *testing.T) {
tests := []struct {
seed int64
length int
blocksize uint32
expected string
}{
{42, 16384, 384, "384:PnwCSZ6yE9r4UCZ1he34xas/E8AhHgdd2yM:PbSZ6yE9rGfExx"},
{1000, 2048, 48, "48:Zo+v/bCSly4VhreHwHJdkHTzF7sjBU1YuD/QtFsByxoSJW+QiLlH:uSWSFteQHJd+Tp79mqSqyCt+5LlH"},
{1000, 1048576, 24576, "24576:xL2L/P40/cnWGr7tsP+mgdQGvnb1UV+gQ8ZwU:ErPP/2WItsPTgdD/bqQ4yU"},
{71268, 24, 3, "3:N0n6xmcFctn:7xmptn"},
}
for _, test := range tests {
generator := rand.New(rand.NewSource(test.seed))
writer := StartFixedBlocksize(test.blocksize)
for i := 0; i < test.length/4; i++ {
binary.Write(writer, binary.BigEndian, generator.Uint32())
}
if writer.String() != test.expected {
t.Errorf("Expected %v, result was %v", test.expected, writer)
}
}
}
func TestWriterIntermediate(t *testing.T) {
tests := []struct {
filename string
initialLength int
expectedIntermediate string
expectedFinal string
blockSize uint32
}{
{
"LAND.MAP",
131072,
"768:tlBecdq6/+dgZUTp+gAdAm:3",
"768:tlBecdq6/+dgZUTp+gAdA3T9Y02xEFshHOl3O98FzbXfBfhPcGxGB3whvm9HvMB1:O",
768,
},
{
"embedded_video_quicktime.doc",
12288,
"192:o50PBwxGc+Zrnn:G8cOb",
"192:o50PBwxGc+ZrnCe9pz1aZ8GHiLUd0935:G8cOz9pzJ3",
192,
},
}
for _, test := range tests {
writer := StartFixedBlocksize(test.blockSize)
path := filepath.Join("testdata", test.filename)
file, openerr := os.Open(path)
if openerr != nil {
t.Fatal(openerr)
}
defer file.Close()
reader := bufio.NewReader(file)
buf4k := make([]byte, test.initialLength)
_, readerr := reader.Read(buf4k)
if readerr != nil {
t.Fatal(readerr)
}
writer.Write(buf4k)
if writer.String() != test.expectedIntermediate {
t.Errorf("Expected intermediate result %s, got %s",
test.expectedIntermediate,
writer.String())
}
reader.WriteTo(writer)
if writer.String() != test.expectedFinal {
t.Errorf("Expected final result %s, got %s",
test.expectedFinal,
writer.String())
}
}
}
func TestWriterReset(t *testing.T) {
generator := rand.New(rand.NewSource(3181))
writer := StartFixedBlocksize(768)
emtpySlice := make([]byte, 0)
for i := 0; i < 4096; i++ {
binary.Write(writer, binary.BigEndian, generator.Uint32())
}
beforeReset := writer.String()
beforeResetBinary := writer.Sum(emtpySlice)
writer.Reset()
generator = rand.New(rand.NewSource(3181))
for i := 0; i < 4096; i++ {
binary.Write(writer, binary.BigEndian, generator.Uint32())
}
afterReset := writer.String()
afterResetBinary := writer.Sum(emtpySlice)
if beforeReset != afterReset {
t.Errorf("Same data written to the same writer, but different results!")
}
if len(afterResetBinary) != len(beforeResetBinary) {
t.Errorf("Binary spamsums are not even the same size")
}
for i, _ := range beforeResetBinary {
if beforeResetBinary[i] != afterResetBinary[i] {
t.Errorf("Binary spamsums before and after reset differ at byte %d", i)
break
}
}
}
func TestSize(t *testing.T) {
writer := StartFixedBlocksize(16)
if writer.Size() != SpamsumLength {
t.Errorf("Max result size should always be equal to SpamsumLength, which is %d\n", SpamsumLength)
}
}