native_client_sdk/src/libraries/nacl_io/dir_node.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef LIBRARIES_NACL_IO_DIR_NODE_H_
   6 #define LIBRARIES_NACL_IO_DIR_NODE_H_
   7
   8 #include <map>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "nacl_io/getdents_helper.h"
  13 #include "nacl_io/node.h"
  14
  15 namespace nacl_io {
  16
  17 class DevFs;
  18 class Html5Fs;
  19 class HttpFs;
  20 class MemFs;
  21 class DirNode;
  22
  23 typedef sdk_util::ScopedRef<DirNode> ScopedDirNode;
  24
  25 class DirNode : public Node {
  26  protected:
  27   explicit DirNode(Filesystem* fs);
  28   virtual ~DirNode();
  29
  30  public:
  31   typedef std::map<std::string, ScopedNode> NodeMap_t;
  32
  33   virtual Error FTruncate(off_t size);
  34   virtual Error GetDents(size_t offs,
  35                          struct dirent* pdir,
  36                          size_t count,
  37                          int* out_bytes);
  38   virtual Error Read(const HandleAttr& attr,
  39                      void* buf,
  40                      size_t count,
  41                      int* out_bytes);
  42   virtual Error Write(const HandleAttr& attr,
  43                       const void* buf,
  44                       size_t count,
  45                       int* out_bytes);
  46
  47   // Adds a finds or adds a directory entry as an INO, updating the refcount
  48   virtual Error AddChild(const std::string& name, const ScopedNode& node);
  49   virtual Error RemoveChild(const std::string& name);
  50   virtual Error FindChild(const std::string& name, ScopedNode* out_node);
  51   virtual int ChildCount();
  52
  53  protected:
  54   void BuildCache_Locked();
  55   void ClearCache_Locked();
  56
  57  private:
  58   GetDentsHelper cache_;
  59   NodeMap_t map_;
  60   bool cache_built_;
  61
  62   friend class DevFs;
  63   friend class Html5Fs;
  64   friend class HttpFs;
  65   friend class MemFs;
  66 };
  67
  68 }  // namespace nacl_io
  69
  70 #endif  // LIBRARIES_NACL_IO_DIR_NODE_H_