[NaCl SDK] nacl_io: big refactor to return error value (errno).

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"
+
+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,
+                             size_t count,
+                             int* out_bytes);
+  Error DownloadPartial(size_t offs, void* buf, size_t count, int* out_bytes);
+  Error DownloadToBuffer(PP_Resource loader,
+                         void* buf,
+                         size_t 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;
+};
+
+#endif  // LIBRARIES_NACL_IO_MOUNT_NODE_HTTP_H_