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sdrangel/rescuesdriq/rescuesdriq.go

191 lines
4.4 KiB
Go

package main
import (
"bufio"
"bytes"
"encoding/binary"
"flag"
"fmt"
"hash/crc32"
"io"
"os"
"time"
)
type HeaderStd struct {
SampleRate uint32
CenterFrequency uint64
StartTimestamp int64
SampleSize uint32
Filler uint32
CRC32 uint32
}
func check(e error) {
if e != nil {
panic(e)
}
}
func analyze(r *bufio.Reader) HeaderStd {
headerbuf := make([]byte, 32) // This is a full header with CRC
n, err := r.Read(headerbuf)
if err != nil && err != io.EOF {
panic(err)
}
if n != 32 {
panic("Header too small")
}
var header HeaderStd
headerr := bytes.NewReader(headerbuf)
err = binary.Read(headerr, binary.LittleEndian, &header)
check(err)
return header
}
func writeHeader(writer *bufio.Writer, header *HeaderStd) {
var bin_buf bytes.Buffer
binary.Write(&bin_buf, binary.LittleEndian, header)
noh, err := writer.Write(bin_buf.Bytes())
check(err)
fmt.Printf("Wrote %d bytes header\n", noh)
}
func setCRC(header *HeaderStd) {
var bin_buf bytes.Buffer
header.Filler = 0
binary.Write(&bin_buf, binary.LittleEndian, header)
header.CRC32 = crc32.ChecksumIEEE(bin_buf.Bytes()[0:28])
}
func GetCRC(header *HeaderStd) uint32 {
var bin_buf bytes.Buffer
header.Filler = 0
binary.Write(&bin_buf, binary.LittleEndian, header)
return crc32.ChecksumIEEE(bin_buf.Bytes()[0:28])
}
func printHeader(header *HeaderStd) {
fmt.Println("Sample rate:", header.SampleRate)
fmt.Println("Frequency :", header.CenterFrequency)
fmt.Println("Sample Size:", header.SampleSize)
tm := time.Unix(header.StartTimestamp, 0)
fmt.Println("Start :", tm)
fmt.Println("CRC32 :", header.CRC32)
fmt.Println("CRC32 OK :", GetCRC(header))
}
func copyContent(reader *bufio.Reader, writer *bufio.Writer, blockSize uint) {
p := make([]byte, blockSize*4096) // buffer in 4k multiples
var sz int64 = 0
for {
n, err := reader.Read(p)
if err != nil {
if err == io.EOF {
writer.Write(p[0:n])
sz += int64(n)
break
} else {
fmt.Println("An error occured during content copy. Aborting")
break
}
} else {
writer.Write(p)
sz += int64(blockSize) * 4096
}
fmt.Printf("Wrote %d bytes\r", sz)
}
fmt.Printf("Wrote %d bytes\r", sz)
}
func main() {
inFileStr := flag.String("in", "foo", "input file")
outFileStr := flag.String("out", "foo", "output file")
sampleRate := flag.Uint("sr", 0, "Sample rate (S/s)")
centerFreq := flag.Uint64("cf", 0, "Center frequency (Hz)")
sampleSize := flag.Uint("sz", 16, "Sample size (16 or 24)")
timeStr := flag.String("ts", "", "start time RFC3339 (ex: 2006-01-02T15:04:05Z)")
timeNow := flag.Bool("now", false, "use now for start time")
blockSize := flag.Uint("bz", 1, "Copy block size in multiple of 4k")
flag.Parse()
flagSeen := make(map[string]bool)
flag.Visit(func(f *flag.Flag) { flagSeen[f.Name] = true })
if flagSeen["in"] {
fmt.Println("input file :", *inFileStr)
// open input file
fi, err := os.Open(*inFileStr)
check(err)
// close fi on exit and check for its returned error
defer func() {
err := fi.Close()
check(err)
}()
// make a read buffer
reader := bufio.NewReader(fi)
var headerOrigin HeaderStd = analyze(reader)
printHeader(&headerOrigin)
if flagSeen["out"] {
if flagSeen["sr"] {
headerOrigin.SampleRate = uint32(*sampleRate)
}
if flagSeen["cf"] {
headerOrigin.CenterFrequency = *centerFreq
}
if flagSeen["sz"] {
if (*sampleSize == 16) || (*sampleSize == 24) {
headerOrigin.SampleSize = uint32(*sampleSize)
} else {
fmt.Println("Incorrect sample size specified. Defaulting to 16")
headerOrigin.SampleSize = 16
}
}
if flagSeen["ts"] {
t, err := time.Parse(time.RFC3339, *timeStr)
if err == nil {
headerOrigin.StartTimestamp = t.Unix()
} else {
fmt.Println("Incorrect time specified. Defaulting to now")
headerOrigin.StartTimestamp = int64(time.Now().Unix())
}
} else if *timeNow {
headerOrigin.StartTimestamp = int64(time.Now().Unix())
}
fmt.Println("\nHeader is now")
printHeader(&headerOrigin)
setCRC(&headerOrigin)
fmt.Println("CRC32 :", headerOrigin.CRC32)
fmt.Println("Output file:", *outFileStr)
fo, err := os.Create(*outFileStr)
check(err)
defer func() {
err := fo.Close()
check(err)
}()
writer := bufio.NewWriter(fo)
writeHeader(writer, &headerOrigin)
copyContent(reader, writer, *blockSize)
fmt.Println("\nCopy done")
writer.Flush()
}
} else {
fmt.Println("No input file given")
}
}