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archive/tar: a []byte copy needed for GNU LongLink

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This commit is contained in:
Vincent Batts 2015-08-13 15:32:17 -04:00
parent 9b9df04f1f
commit 4d66163297
1 changed files with 10 additions and 22 deletions
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32
archive/tar/reader.go
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@ -154,60 +154,48 @@ func (tr *Reader) Next() (*Header, error) {
} }
return hdr, nil return hdr, nil
case TypeGNULongName: case TypeGNULongName:
var b *bytes.Buffer
if tr.RawAccounting {
b = bytes.NewBuffer(tr.RawBytes())
}
// We have a GNU long name header. Its contents are the real file name. // We have a GNU long name header. Its contents are the real file name.
realname, err := ioutil.ReadAll(tr) realname, err := ioutil.ReadAll(tr)
if err != nil { if err != nil {
return nil, err return nil, err
} }
var buf []byte
if tr.RawAccounting { if tr.RawAccounting {
if _, err = tr.rawBytes.Write(b.Bytes()); err != nil {
return nil, err
}
if _, err = tr.rawBytes.Write(realname); err != nil { if _, err = tr.rawBytes.Write(realname); err != nil {
return nil, err return nil, err
} }
b.Reset() buf = make([]byte, tr.rawBytes.Len())
b.Write(tr.RawBytes()) copy(buf[:], tr.RawBytes())
} }
hdr, err := tr.Next() hdr, err := tr.Next()
// since the above call to Next() resets the buffer, we need to throw the bytes over // since the above call to Next() resets the buffer, we need to throw the bytes over
if tr.RawAccounting { if tr.RawAccounting {
b.Write(tr.RawBytes()) buf = append(buf, tr.RawBytes()...)
if _, err = tr.rawBytes.Write(b.Bytes()); err != nil { if _, err = tr.rawBytes.Write(buf); err != nil {
return nil, err return nil, err
} }
} }
hdr.Name = cString(realname) hdr.Name = cString(realname)
return hdr, err return hdr, err
case TypeGNULongLink: case TypeGNULongLink:
var b *bytes.Buffer
if tr.RawAccounting {
b = bytes.NewBuffer(tr.RawBytes())
}
// We have a GNU long link header. // We have a GNU long link header.
realname, err := ioutil.ReadAll(tr) realname, err := ioutil.ReadAll(tr)
if err != nil { if err != nil {
return nil, err return nil, err
} }
var buf []byte
if tr.RawAccounting { if tr.RawAccounting {
if _, err = tr.rawBytes.Write(b.Bytes()); err != nil {
return nil, err
}
if _, err = tr.rawBytes.Write(realname); err != nil { if _, err = tr.rawBytes.Write(realname); err != nil {
return nil, err return nil, err
} }
b.Reset() buf = make([]byte, tr.rawBytes.Len())
b.Write(tr.RawBytes()) copy(buf[:], tr.RawBytes())
} }
hdr, err := tr.Next() hdr, err := tr.Next()
// since the above call to Next() resets the buffer, we need to throw the bytes over // since the above call to Next() resets the buffer, we need to throw the bytes over
if tr.RawAccounting { if tr.RawAccounting {
b.Write(tr.RawBytes()) buf = append(buf, tr.RawBytes()...)
if _, err = tr.rawBytes.Write(b.Bytes()); err != nil { if _, err = tr.rawBytes.Write(buf); err != nil {
return nil, err return nil, err
} }
} }