Add directory_entry.cc to libppapi_cpp

I believe FileRef::ReadDirectoryEntries is the one depends on it.

BUG=
R=binji@chromium.org, sbc@chromium.org

Review URL: https://codereview.chromium.org/15969018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203995 0039d316-1c4b-4281-b951-d872f2087c98

native_client_sdk/src/build_tools/sdk_files.list

@@ -658,6 +658,7 @@ src/ppapi_cpp/array_output.cc
 src/ppapi_cpp/audio.cc
 src/ppapi_cpp/audio_config.cc
 src/ppapi_cpp/core.cc
+src/ppapi_cpp/directory_entry.cc
 src/ppapi_cpp/file_io.cc
 src/ppapi_cpp/file_ref.cc
 src/ppapi_cpp/file_system.cc

native_client_sdk/src/examples/api/file_io/example.js

@@ -19,6 +19,7 @@ function attachListeners() {
   document.getElementById('saveButton').addEventListener('click', saveFile);
   document.getElementById('loadButton').addEventListener('click', loadFile);
   document.getElementById('deleteButton').addEventListener('click', deleteFile);
+  document.getElementById('listButton').addEventListener('click', listDir);
 }
 
 function loadFile() {
@@ -55,6 +56,17 @@ function deleteFile() {
   }
 }
 
+function listDir() {
+  if (common.naclModule) {
+    var dirName = document.getElementById('dirName').value;
+
+    // Package a message using a simple protocol containing:
+    // instruction file_name_length file_name
+    var msg = "ls " + dirName.length + " " + dirName;
+    common.naclModule.postMessage(msg);
+  }
+}
+
 // Called by the common.js module.
 function handleMessage(message_event) {
   var messageParts = message_event.data.split("|", 3);

native_client_sdk/src/examples/api/file_io/file_io.cc

@@ -11,6 +11,7 @@
 
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/c/ppb_file_io.h"
+#include "ppapi/cpp/directory_entry.h"
 #include "ppapi/cpp/file_io.h"
 #include "ppapi/cpp/file_ref.h"
 #include "ppapi/cpp/file_system.h"
@@ -39,6 +40,7 @@ namespace {
 const char* const kLoadPrefix = "ld";
 const char* const kSavePrefix = "sv";
 const char* const kDeletePrefix = "de";
+const char* const kListPrefix = "ls";
 }
 
 /// The Instance class.  One of these exists for each instance of your NaCl
@@ -133,6 +135,13 @@ class FileIoInstance : public pp::Instance {
           callback_factory_.NewCallback(&FileIoInstance::Delete, file_name));
       return;
     }
+
+    if (instruction.compare(kListPrefix) == 0) {
+      const std::string& dir_name = file_name;
+      file_thread_.message_loop().PostWork(
+          callback_factory_.NewCallback(&FileIoInstance::List, dir_name));
+      return;
+    }
   }
 
   void OpenFileSystem(int32_t /* result */) {
@@ -267,6 +276,35 @@ class FileIoInstance : public pp::Instance {
     ShowStatusMessage("File deleted");
   }
 
+  void List(int32_t /* result */, const std::string& dir_name) {
+    if (!file_system_ready_) {
+      ShowErrorMessage("File system is not open", PP_ERROR_FAILED);
+      return;
+    }
+    pp::FileRef ref(file_system_, dir_name.c_str());
+
+    // Pass ref along to keep it alive.
+    ref.ReadDirectoryEntries(callback_factory_.NewCallbackWithOutput(
+        &FileIoInstance::ListCallback, ref));
+  }
+
+  void ListCallback(int32_t result,
+                    const std::vector<pp::DirectoryEntry>& entries,
+                    pp::FileRef /* unused_ref */) {
+    if (result != PP_OK) {
+      ShowErrorMessage("List failed", result);
+      return;
+    }
+
+    std::string buffer = "File list:";
+    for (size_t i = 0; i < entries.size(); ++i) {
+      pp::Var name = entries[i].file_ref().GetName();
+      if (name.is_string())
+        buffer += " " + name.AsString();
+    }
+    ShowStatusMessage(buffer);
+  }
+
   /// Encapsulates our simple javascript communication protocol
   void ShowErrorMessage(const std::string& message, int32_t result) {
     std::stringstream ss;

native_client_sdk/src/examples/api/file_io/index.html

@@ -29,6 +29,10 @@
   <button id="loadButton" action="">Load</button>
   <button id="deleteButton" action="">Delete</button>
 
+  <br>Directory Name
+  <input type="text" id="dirName" action="" value="/">
+  <button id="listButton" action="">List</button>
+
   <!-- The NaCl plugin will be embedded inside the element with id "listener".
       See common.js.-->
   <div id="listener"></div>

native_client_sdk/src/libraries/ppapi_cpp/library.dsc

@@ -18,6 +18,7 @@
           'audio.cc',
           'audio_config.cc',
           'core.cc',
+          'directory_entry.cc',
           'file_io.cc',
           'file_ref.cc',
           'file_system.cc',