add unix stat constants.

Author: ctalkington

lib/archivers/zip/unix-stat.js

@@ -0,0 +1,53 @@
+/**
+ * node-compress-commons
+ *
+ * Copyright (c) 2014 Chris Talkington, contributors.
+ * Licensed under the MIT license.
+ * https://github.com/archiverjs/node-compress-commons/blob/master/LICENSE-MIT
+ */
+module.exports = {
+    /**
+     * Bits used for permissions (and sticky bit)
+     */
+    PERM_MASK: 4095, // 07777
+
+    /**
+     * Bits used to indicate the filesystem object type.
+     */
+    FILE_TYPE_FLAG: 61440, // 0170000
+
+    /**
+     * Indicates symbolic links.
+     */
+    LINK_FLAG: 40960, // 0120000
+
+    /**
+     * Indicates plain files.
+     */
+    FILE_FLAG: 32768, // 0100000
+
+    /**
+     * Indicates directories.
+     */
+    DIR_FLAG: 16384, // 040000
+
+    // ----------------------------------------------------------
+    // somewhat arbitrary choices that are quite common for shared
+    // installations
+    // -----------------------------------------------------------
+
+    /**
+     * Default permissions for symbolic links.
+     */
+    DEFAULT_LINK_PERM: 511, // 0777
+
+    /**
+     * Default permissions for directories.
+     */
+    DEFAULT_DIR_PERM: 493, // 0755
+
+    /**
+     * Default permissions for plain files.
+     */
+    DEFAULT_FILE_PERM: 420 // 0644
+};

lib/archivers/zip/zip-archive-entry.js

@@ -10,6 +10,7 @@ var normalizePath = require('normalize-path');
 
 var ArchiveEntry = require('../archive-entry');
 var GeneralPurposeBit = require('./general-purpose-bit');
+var UnixStat = require('./unix-stat');
 
 var constants = require('./constants');
 var zipUtil = require('./util');
@@ -219,7 +220,7 @@ ZipArchiveEntry.prototype.isDirectory = function() {
 };
 
 ZipArchiveEntry.prototype.isUnixSymlink = function() {
-  return (this.getUnixMode() & constants.S_IFMT) === constants.S_IFLNK;
+  return (this.getUnixMode() & UnixStat.FILE_TYPE_FLAG) === UnixStat.LINK_FLAG;
 };
 
 ZipArchiveEntry.prototype.isZip64 = function() {