Use safe-buffer for node 4 <4.5.0

Re #175

lib/buffer.js

@@ -0,0 +1,11 @@
+'use strict'
+
+// Buffer in node 4.x < 4.5.0 doesn't have working Buffer.from
+// or Buffer.alloc, and Buffer in node 10 deprecated the ctor.
+// .M, this is fine .\^/M..
+let B = Buffer
+/* istanbul ignore next */
+if (!B.alloc) {
+  B = require('safe-buffer').Buffer
+}
+module.exports = B

lib/header.js

@@ -4,6 +4,7 @@
 // the data could not be faithfully encoded in a simple header.
 // (Also, check header.needPax to see if it needs a pax header.)
 
+const Buffer = require('./buffer.js')
 const types = require('./types.js')
 const pathModule = require('path')
 const large = require('./large-numbers.js')

lib/list.js

@@ -1,5 +1,7 @@
 'use strict'
 
+const Buffer = require('./buffer.js')
+
 // XXX: This shares a lot in common with extract.js
 // maybe some DRY opportunity here?
 

lib/pack.js

@@ -1,5 +1,7 @@
 'use strict'
 
+const Buffer = require('./buffer.js')
+
 // A readable tar stream creator
 // Technically, this is a transform stream that you write paths into,
 // and tar format comes out of.

lib/pax.js

@@ -1,4 +1,5 @@
 'use strict'
+const Buffer = require('./buffer.js')
 const Header = require('./header.js')
 const path = require('path')
 

lib/replace.js

@@ -1,4 +1,5 @@
 'use strict'
+const Buffer = require('./buffer.js')
 
 // tar -r
 const hlo = require('./high-level-opt.js')

lib/write-entry.js

@@ -1,4 +1,5 @@
 'use strict'
+const Buffer = require('./buffer.js')
 const MiniPass = require('minipass')
 const Pax = require('./pax.js')
 const Header = require('./header.js')

package.json

@@ -21,6 +21,7 @@
     "minipass": "^2.2.1",
     "minizlib": "^1.1.0",
     "mkdirp": "^0.5.0",
+    "safe-buffer": "^5.1.1",
     "yallist": "^3.0.2"
   },
   "devDependencies": {

test/header.js

@@ -1,4 +1,5 @@
 'use strict'
+const Buffer = require('../lib/buffer.js')
 const t = require('tap')
 const Header = require('../lib/header.js')
 

test/large-numbers.js

@@ -1,4 +1,5 @@
 'use strict'
+const Buffer = require('../lib/buffer.js')
 const large = require('../lib/large-numbers.js')
 const encode = large.encode
 const parse = large.parse

test/make-tar.js

@@ -1,4 +1,5 @@
 'use strict'
+const Buffer = require('../lib/buffer.js')
 // a little utility to create virtual tar data
 if (module === require.main)
   return require('tap').pass('this is fine')

test/pack.js

@@ -1,4 +1,5 @@
 'use strict'
+const Buffer = require('../lib/buffer.js')
 const t = require('tap')
 const Pack = require('../lib/pack.js')
 const PackSync = Pack.Sync

test/read-entry.js

@@ -1,4 +1,5 @@
 'use strict'
+const Buffer = require('../lib/buffer.js')
 const t = require('tap')
 const ReadEntry = require('../lib/read-entry.js')
 const Header = require('../lib/header.js')

test/replace.js

@@ -1,4 +1,5 @@
 'use strict'
+const Buffer = require('../lib/buffer.js')
 const t = require('tap')
 const r = require('../lib/replace.js')
 const path = require('path')

test/update.js

@@ -1,4 +1,5 @@
 'use strict'
+const Buffer = require('../lib/buffer.js')
 const t = require('tap')
 const u = require('../lib/update.js')
 const path = require('path')