fs.WriteStream.write should support buffer

Also re-adding the callback parameter.

lib/fs.js

@@ -752,14 +752,25 @@ WriteStream.prototype.flush = function () {
 };
 
 
-WriteStream.prototype.write = function(data, encoding) {
+WriteStream.prototype.write = function (data) {
   if (!this.writeable) {
     throw new Error('stream not writeable');
   }
 
-  // TODO handle Buffer
+  var cb;
+  if (typeof(arguments[arguments.length-1]) == 'function') {
+    cb = arguments[arguments.length-1];
+  }
+
+  if (data instanceof Buffer) {
+    this._queue.push([fs.write, data, 0, data.length, null, cb]);
+  } else {
+    var encoding = 'utf8';
+    if (typeof(arguments[1]) == 'string') encoding = arguments[1];
+    this._queue.push([fs.write, data, undefined, encoding, cb]);
+  }
+
 
-  this._queue.push([fs.write, data, undefined, encoding || 'utf8', null]);
   this.flush();
 
   return false;

test/fixtures/print-chars-from-buffer.js

@@ -0,0 +1,9 @@
+require("../common");
+Buffer = require("buffer").Buffer;
+
+var n = parseInt(process.argv[2]);
+
+b = new Buffer(n);
+for (var i = 0; i < n; i++) { b[i] = 100; }
+
+process.stdout.write(b);

test/fixtures/stdout.js

@@ -1,2 +0,0 @@
-var sys = require('sys');
-sys.puts('test');

test/simple/test-stdout-to-file.js

@@ -1,19 +1,52 @@
 require('../common');
-var path = require('path')
-  , childProccess = require('child_process')
-  , fs = require('fs')
-  , stdoutScript = path.join(path.dirname(__dirname), 'fixtures/stdout.js')
-  , tmpFile = path.join(path.dirname(__dirname), 'fixtures/stdout.txt')
-  , cmd = process.argv[0]+' '+stdoutScript+' > '+tmpFile;
+path = require('path');
+childProccess = require('child_process');
+fs = require('fs');
+scriptString = path.join(fixturesDir, 'print-chars.js');
+scriptBuffer = path.join(fixturesDir, 'print-chars-from-buffer.js');
+tmpFile = path.join(fixturesDir, 'stdout.txt');
+
+function test (size, useBuffer, cb) {
+  var cmd = process.argv[0]
+          + ' '
+          + (useBuffer ? scriptBuffer : scriptString)
+          + ' '
+          + size
+          + ' > '
+          + tmpFile
+          ;
 
   try {
     fs.unlinkSync(tmpFile);
   } catch (e) {}
 
+  print(size + ' chars to ' + tmpFile + '...');
+
   childProccess.exec(cmd, function(err) {
     if (err) throw err;
 
-  var data = fs.readFileSync(tmpFile);
-  assert.equal(data, "test\n");
+    puts('done!');
+
+    var stat = fs.statSync(tmpFile);
+
+    puts(tmpFile + ' has ' + stat.size + ' bytes');
+
+    assert.equal(size, stat.size);
     fs.unlinkSync(tmpFile);
+
+    cb();
+  });
+}
+
+finished = false;
+test(1024*1024, false, function () {
+  puts("Done printing with string");
+  test(1024*1024, true, function () {
+    puts("Done printing with buffer");
+    finished = true;
+  });
+});
+
+process.addListener('exit', function () {
+  assert.ok(finished);
 });