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looking for missing bytes

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This commit is contained in:
Vincent Batts 2015-02-19 18:07:22 -05:00
parent f45a3e13ee
commit 739daf3e09
2 changed files with 17 additions and 2 deletions
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6
archive/tar/reader.go
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@ -666,6 +666,12 @@ func (tr *Reader) readOldGNUSparseMap(header []byte) []sparseEntry {
if _, tr.err = io.ReadFull(tr.r, sparseHeader); tr.err != nil {
return nil
}
if tr.RawAccounting {
if _, tr.err = tr.rawBytes.Write(sparseHeader); tr.err != nil {
return nil
}
}
isExtended = sparseHeader[oldGNUSparseExtendedHeaderIsExtendedOffset] != 0
s = slicer(sparseHeader)
for i := 0; i < oldGNUSparseExtendedHeaderNumEntries; i++ {

13
main.go
View file

@ -4,7 +4,6 @@ import (
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"os"
@ -23,6 +22,13 @@ func main() {
}
defer fh.Close()
output, err := os.Create(fmt.Sprintf("%s.out", arg))
if err != nil {
log.Fatal(err)
}
defer output.Close()
log.Printf("writing %q to %q", fh.Name(), output.Name())
fi, err := fh.Stat()
if err != nil {
log.Fatal(err)
@ -40,12 +46,14 @@ func main() {
break
}
pre := tr.RawBytes()
output.Write(pre)
var i int64
if i, err = io.Copy(ioutil.Discard, tr); err != nil {
if i, err = io.Copy(output, tr); err != nil {
log.Println(err)
break
}
post := tr.RawBytes()
output.Write(pre)
fmt.Println(hdr.Name, "pre:", len(pre), "read:", i, "post:", len(post))
sum += int64(len(pre))
sum += i
@ -54,6 +62,7 @@ func main() {
if size != sum {
fmt.Printf("Size: %d; Sum: %d; Diff: %d\n", size, sum, size-sum)
fmt.Printf("Compare like `cmp -bl %s %s | less`\n", fh.Name(), output.Name())
} else {
fmt.Printf("Size: %d; Sum: %d\n", size, sum)
}