forked from gophergala2016/chopher
/
main.go
196 lines (166 loc) · 3.59 KB
/
main.go
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package main
import (
"bytes"
"errors"
"flag"
"fmt"
"io"
"log"
"math"
"math/rand"
"net/http"
"os"
"path/filepath"
"strings"
"github.com/pointlander/chopher/api"
"github.com/pointlander/chopher/hasher"
"github.com/pointlander/chopher/karplus"
"github.com/pointlander/chopher/wave"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
)
var file = flag.String("file", "", "file to hash")
var seed = flag.Int64("seed", 0, "random seed for song")
type RandReader struct {
size int
rnd *rand.Rand
}
func NewRandReader(size int, seed int64) *RandReader {
return &RandReader{
size: size,
rnd: rand.New(rand.NewSource(seed)),
}
}
func (rr *RandReader) Read(p []byte) (n int, err error) {
for i := range p {
p[i] = byte(rr.rnd.Int())
rr.size--
n++
if rr.size == 0 {
err = errors.New("End of random stream")
return
}
}
return
}
func inverse(buffer []byte) {
length := len(buffer)
input, major, minor := make([]byte, length), [256]int{}, make([]int, length)
for k, v := range buffer {
input[k], minor[k], major[v] = v, major[v], major[v]+1
}
sum := 0
for k, v := range major {
major[k], sum = sum, sum+v
}
j := length - 1
for k, _ := range input {
for minor[k] != -1 {
buffer[j], j, k, minor[k] = input[k], j-1, major[input[k]]+minor[k], -1
}
}
}
type StructuredReader struct {
*bytes.Reader
}
func NewStructuredReader(size int, seed int64) *StructuredReader {
rnd := rand.New(rand.NewSource(seed))
samples := make([]byte, 4)
for i := range samples {
samples[i] = byte(rnd.Int())
}
j, out := 0, make([]byte, size)
for i := range out {
out[i] = samples[j]
j++
if j >= len(samples) {
inverse(samples)
j = 0
}
}
return &StructuredReader{bytes.NewReader(out)}
}
type HoloReader struct {
*bytes.Reader
}
func NewHoloReader(size int, seed int64) *HoloReader {
rnd := rand.New(rand.NewSource(seed))
out := make([]byte, size)
for i := range out {
sample := math.Abs(rnd.NormFloat64() * 8)
if sample > 256 {
sample = 256
}
out[i] = byte(sample)
}
//move to front
nodes := [256]byte{}
var first byte
for node, _ := range nodes {
nodes[node] = uint8(node) + 1
}
for i, symbol := range out {
var node, next byte
moveToFront := symbol != 0
for next = first; symbol > 0; node, next = next, nodes[next] {
symbol--
}
if moveToFront {
first, nodes[node], nodes[next] = next, nodes[next], first
}
out[i] = next
}
//burrows wheeler
inverse(out)
return &HoloReader{bytes.NewReader(out)}
}
func main() {
flag.Parse()
if *file != "" {
in, err := os.Open(*file)
if err != nil {
log.Fatal(err)
}
h := hasher.New(in)
sng := h.Hash()
in.Close()
wav := wave.New(wave.Stereo, 22000)
ks := karplus.Song{
Song: *sng,
SamplingRate: 22000,
}
ks.Sound(&wav)
out, err := os.Create(strings.TrimSuffix(*file, filepath.Ext(*file)) + ".wav")
if err != nil {
log.Fatal(err)
}
io.Copy(out, wav.Reader())
return
}
if *seed != 0 {
in := NewStructuredReader(2*1024*1024, *seed)
h := hasher.New(in)
sng := h.Hash()
wav := wave.New(wave.Stereo, 22000)
ks := karplus.Song{
Song: *sng,
SamplingRate: 22000,
}
ks.Sound(&wav)
out, err := os.Create(fmt.Sprintf("%v.wav", *seed))
if err != nil {
log.Fatal(err)
}
io.Copy(out, wav.Reader())
return
}
port := os.Getenv("PORT")
if port == "" {
port = "8000"
}
r := mux.NewRouter()
r.StrictSlash(true)
r.PathPrefix("/").Handler(http.FileServer(http.Dir("./static/"))).Methods("GET")
r.HandleFunc("/upload", api.FileUploadHandler).Methods("POST")
http.ListenAndServe(":"+port, handlers.LoggingHandler(os.Stdout, r))
}