func main() {
flag.Parse()
file := flag.Arg(0)
if file != `` {
hashutil.WriteChecksum(file)
} else {
log.Fatalln("No file provided")
}
}
func checkSum(filePath string, checksumFileUrl string) bool {
hashutil.WriteChecksum(filePath)
downloadChecksum(checksumFileUrl)
return hashutil.CompareChecksum(filePath)
}
func Chunk(path string) {
fileinfo, err := os.Stat(path)
if err != nil {
panic(err)
}
if fileinfo.Size() < 100000000 {
panic(`File must be 100MB or more`)
}
// Make sha1
hashutil.WriteChecksum(path)
// open input file
fi, err := os.Open(path)
if err != nil {
panic(err)
}
// close fi on exit and check for its returned error
defer func() {
if err := fi.Close(); err != nil {
panic(err)
}
}()
readIndex := 0
i := 0
for {
// open output file
fo, err := os.Create(path + `.part` + strconv.Itoa(i))
if err != nil {
panic(err)
}
// close fo on exit and check for its returned error
defer func() {
finfo, err := fo.Stat()
if err != nil {
panic(err)
}
if err := fo.Close(); err != nil {
panic(err)
}
if finfo.Size() == 0 {
os.Remove(fo.Name())
} else {
hashutil.WriteChecksum(fo.Name())
}
}()
// make a buffer to keep chunks that are read
buf := make([]byte, 50000000)
// read a chunk
log.Println(`readIndex =`, readIndex)
byteRead, err := fi.ReadAt(buf, int64(readIndex))
log.Println(`Read`, byteRead, `bytes`)
// Somehow ReadAt() returns EOF != io.EOF so we have to manually compare like this
if err != nil && err.Error() != `read `+fi.Name()+`: Reached the end of the file.` {
panic(err)
}
if byteRead == 0 {
break
}
// write a chunk
log.Println(`Begin writing`)
if _, err := fo.Write(buf[:byteRead]); err != nil {
panic(err)
}
readIndex += byteRead
i++
}
}
