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+// Copyright 2009 Google LLC
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google LLC nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// A wrapper for libcurl to do HTTP Uploads, to support easy mocking
+// and unit testing of the HTTPUpload class.
+
+#ifndef COMMON_LINUX_LIBCURL_WRAPPER_H_
+#define COMMON_LINUX_LIBCURL_WRAPPER_H_
+
+#include <string>
+#include <map>
+
+#include "common/using_std_string.h"
+#include "third_party/curl/curl.h"
+
+namespace google_breakpad {
+
+// This class is only safe to be used on single-threaded code because of its
+// usage of libcurl's curl_global_cleanup().
+class LibcurlWrapper {
+ public:
+  LibcurlWrapper();
+  virtual ~LibcurlWrapper();
+  virtual bool Init();
+  virtual bool SetProxy(const string& proxy_host,
+                        const string& proxy_userpwd);
+  virtual bool AddFile(const string& upload_file_path,
+                       const string& basename);
+  virtual bool SendRequest(const string& url,
+                           const std::map<string, string>& parameters,
+                           long* http_status_code,
+                           string* http_header_data,
+                           string* http_response_data);
+  bool SendGetRequest(const string& url,
+                      long* http_status_code,
+                      string* http_header_data,
+                      string* http_response_data);
+  bool SendPutRequest(const string& url,
+                      const string& path,
+                      long* http_status_code,
+                      string* http_header_data,
+                      string* http_response_data);
+  bool SendSimplePostRequest(const string& url,
+                             const string& body,
+                             const string& content_type,
+                             long* http_status_code,
+                             string* http_header_data,
+                             string* http_response_data);
+
+ private:
+  // This function initializes class state corresponding to function
+  // pointers into the CURL library.
+  bool SetFunctionPointers();
+
+  bool SendRequestInner(const string& url,
+                        long* http_status_code,
+                        string* http_header_data,
+                        string* http_response_data);
+
+  void Reset();
+
+  bool CheckInit();
+
+  bool init_ok_;                 // Whether init succeeded
+  void* curl_lib_;               // Pointer to result of dlopen() on
+                                 // curl library
+  string last_curl_error_;  // The text of the last error when
+                                 // dealing
+  // with CURL.
+
+  CURL* curl_;                   // Pointer for handle for CURL calls.
+
+  CURL* (*easy_init_)(void);
+
+  // Stateful pointers for calling into curl_formadd()
+  struct curl_httppost* formpost_;
+  struct curl_httppost* lastptr_;
+  struct curl_slist* headerlist_;
+
+  // Function pointers into CURL library
+  CURLcode (*easy_setopt_)(CURL*, CURLoption, ...);
+  CURLFORMcode (*formadd_)(struct curl_httppost**,
+                           struct curl_httppost**, ...);
+  struct curl_slist* (*slist_append_)(struct curl_slist*, const char*);
+  void (*slist_free_all_)(struct curl_slist*);
+  CURLcode (*easy_perform_)(CURL*);
+  const char* (*easy_strerror_)(CURLcode);
+  void (*easy_cleanup_)(CURL*);
+  CURLcode (*easy_getinfo_)(CURL*, CURLINFO info, ...);
+  void (*easy_reset_)(CURL*);
+  void (*formfree_)(struct curl_httppost*);
+  void (*global_cleanup_)(void);
+
+};
+}
+
+#endif  // COMMON_LINUX_LIBCURL_WRAPPER_H_