Overwrite header.size with pax header size, if present (#78)

* Overwrite header.size with pax header size, if present

* Added test for huge file extract

* Fixed style guide violations

* More style guide fixes

extract.js

@@ -22,6 +22,7 @@ var emptyStream = function (self, offset) {
 var mixinPax = function (header, pax) {
   if (pax.path) header.name = pax.path
   if (pax.linkpath) header.linkname = pax.linkpath
+  if (pax.size) header.size = parseInt(pax.size, 10)
   header.pax = pax
   return header
 }

test/extract.js

@@ -3,6 +3,8 @@ var tar = require('../index')
 var fixtures = require('./fixtures')
 var concat = require('concat-stream')
 var fs = require('fs')
+var stream = require('stream')
+var zlib = require('zlib')
 
 var clamp = function (index, len, defaultValue) {
   if (typeof index !== 'number') return defaultValue
@@ -533,3 +535,57 @@ test('base 256 size', function (t) {
 
   extract.end(fs.readFileSync(fixtures.BASE_256_SIZE))
 })
+
+test('huge', function (t) {
+  t.plan(1)
+
+  var extract = tar.extract()
+  var noEntries = false
+  var hugeFileSize = 8804630528  // ~8.2GB
+  var dataLength = 0
+
+  var countStream = new stream.Writable()
+  countStream._write = function (chunk, encoding, done) {
+    dataLength += chunk.length
+    done()
+  }
+
+  // Make sure we read the correct pax size entry for a file larger than 8GB.
+  extract.on('entry', function (header, stream, callback) {
+    t.deepEqual(header, {
+      devmajor: 0,
+      devminor: 0,
+      gid: 20,
+      gname: 'staff',
+      linkname: null,
+      mode: 420,
+      mtime: new Date(1521214967000),
+      name: 'huge.txt',
+      pax: {
+        'LIBARCHIVE.creationtime': '1521214954',
+        'SCHILY.dev': '16777218',
+        'SCHILY.ino': '91584182',
+        'SCHILY.nlink': '1',
+        atime: '1521214969',
+        ctime: '1521214967',
+        size: hugeFileSize.toString()
+      },
+      size: hugeFileSize,
+      type: 'file',
+      uid: 502,
+      uname: 'apd4n'
+    })
+
+    noEntries = true
+    stream.pipe(countStream)
+  })
+
+  extract.on('finish', function () {
+    t.ok(noEntries)
+    t.equal(dataLength, hugeFileSize)
+  })
+
+  var gunzip = zlib.createGunzip()
+  var reader = fs.createReadStream(fixtures.HUGE)
+  reader.pipe(gunzip).pipe(extract)
+})

test/fixtures/index.js

@@ -14,3 +14,4 @@ exports.GNU_LONG_PATH = path.join(__dirname, 'gnu-long-path.tar')
 exports.BASE_256_UID_GID = path.join(__dirname, 'base-256-uid-gid.tar')
 exports.LARGE_UID_GID = path.join(__dirname, 'large-uid-gid.tar')
 exports.BASE_256_SIZE = path.join(__dirname, 'base-256-size.tar')
+exports.HUGE = path.join(__dirname, 'huge.tar.gz')