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Merge pull request #11 from dominictarr/master

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emit error on invalid header
This commit is contained in:
Mathias Buus 2014-03-24 15:07:26 +01:00
commit 37a497ff7e
2 changed files with 32 additions and 20 deletions
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7
extract.js
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@ -75,7 +75,12 @@ var Extract = function(opts) {
};
var onheader = function() {
var header = self._header = headers.decode(b.slice(0, 512));
var header
try {
header = self._header = headers.decode(b.slice(0, 512));
} catch (err) {
self.emit('error', err)
}
b.consume(512);
if (!header) {

41
headers.js
View file

@ -176,8 +176,6 @@ exports.decode = function(buf) {
var typeflag = buf[156] === 0 ? 0 : buf[156] - ZERO_OFFSET;
var type = toType(typeflag);
if (!type) return null;
var name = decodeStr(buf, 0, 100);
var mode = decodeOct(buf, 100);
var uid = decodeOct(buf, 108);
@ -192,20 +190,29 @@ exports.decode = function(buf) {
if (buf[345]) name = decodeStr(buf, 345, 155)+'/'+name;
if (cksum(buf) !== decodeOct(buf, 148)) return null;
var c = cksum(buf)
return {
name: name,
mode: mode,
uid: uid,
gid: gid,
size: size,
mtime: new Date(1000 * mtime),
type: toType(typeflag),
linkname: linkname,
uname: uname,
gname: gname,
devmajor: devmajor,
devminor: devminor
};
//checksum is still initial value if header was null.
if (c === 8*32) return null;
//valid checksum
if (c === decodeOct(buf, 148))
return {
name: name,
mode: mode,
uid: uid,
gid: gid,
size: size,
mtime: new Date(1000 * mtime),
type: toType(typeflag),
linkname: linkname,
uname: uname,
gname: gname,
devmajor: devmajor,
devminor: devminor
};
//invalid checksum
throw new Error('invalid header');
};