native_client_sdk/src/libraries/nacl_io/mount_node_http.h

// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef LIBRARIES_NACL_IO_MOUNT_NODE_HTTP_H_
#define LIBRARIES_NACL_IO_MOUNT_NODE_HTTP_H_

#include <map>
#include <string>
#include <vector>

#include "nacl_io/error.h"
#include "nacl_io/mount_node.h"
#include "nacl_io/pepper_interface.h"

namespace nacl_io {

typedef std::map<std::string, std::string> StringMap_t;

class MountNodeHttp : public MountNode {
 public:
  virtual Error FSync();
  virtual Error GetDents(size_t offs,
                         struct dirent* pdir,
                         size_t count,
                         int* out_bytes);
  virtual Error GetStat(struct stat* stat);
  virtual Error Read(size_t offs, void* buf, size_t count, int* out_bytes);
  virtual Error FTruncate(off_t size);
  virtual Error Write(size_t offs,
                      const void* buf,
                      size_t count,
                      int* out_bytes);
  virtual Error GetSize(size_t* out_size);

  void SetCachedSize(off_t size);

 protected:
  MountNodeHttp(Mount* mount, const std::string& url, bool cache_content);

 private:
  Error OpenUrl(const char* method,
                StringMap_t* request_headers,
                PP_Resource* out_loader,
                PP_Resource* out_request,
                PP_Resource* out_response,
                int32_t* out_statuscode,
                StringMap_t* out_response_headers);

  Error DownloadToCache();
  Error ReadPartialFromCache(size_t offs,
                             void* buf,
                             int count,
                             int* out_bytes);
  Error DownloadPartial(size_t offs, void* buf, size_t count, int* out_bytes);
  Error DownloadToBuffer(PP_Resource loader,
                         void* buf,
                         int count,
                         int* out_bytes);

  std::string url_;
  std::vector<char> buffer_;

  bool cache_content_;
  bool has_cached_size_;
  std::vector<char> cached_data_;

  friend class MountHttp;
};

}  // namespace nacl_io

#endif  // LIBRARIES_NACL_IO_MOUNT_NODE_HTTP_H_