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tar-split/main.go

65 lines
1.1 KiB
Go

package main
import (
"crypto"
"flag"
"io"
"log"
"os"
)
func main() {
flag.Parse()
hdrBuff := make([]byte, BlockSize)
for _, arg := range flag.Args() {
func() {
// Open the tar archive
fh, err := os.Open(arg)
if err != nil {
log.Fatal(err)
}
defer fh.Close()
// prep our buffer
buf := hdrBuff[:]
copy(buf, zeroBlock)
if _, err := io.ReadFull(fh, buf); err != nil {
log.Fatal(err)
}
}()
}
}
const BlockSize = 512
var (
zeroBlock = make([]byte, BlockSize)
flOutputJson = flag.String("o", "", "output json of the tar archives")
)
type (
// for a whole tar archive
TarInfo struct {
Name string
Entries []Entry
// TODO(vbatts) would be nice to satisfy the Reader interface, so that this could be passed directly to tar.Reader
}
// each file from the tar archive has it's header copied exactly,
//and payload of it's file Checksummed if the file size is greater than 0
Entry struct {
Pos int64
Header []byte
Size int64
Checksum []byte
Hash crypto.Hash
// TODO(vbatts) perhaps have info to find the file on disk, to provide an io.Reader
}
)