Improve linearized pdf load/show time.

pdf/url_loader_wrapper_impl.h

Index: pdf/url_loader_wrapper_impl.h
diff --git a/pdf/url_loader_wrapper_impl.h b/pdf/url_loader_wrapper_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..b49481848e35a8c3fb770038c7adab9febfe52bd
--- /dev/null
+++ b/pdf/url_loader_wrapper_impl.h
@@ -0,0 +1,89 @@
+// Copyright 2016 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 PDF_URL_LOADER_WRAPPER_IMPL_H_
+#define PDF_URL_LOADER_WRAPPER_IMPL_H_
+
+#include <memory>
+#include <string>
+
+#include "base/macros.h"
+#include "pdf/url_loader_wrapper.h"
+#include "ppapi/cpp/url_loader.h"
+#include "ppapi/utility/completion_callback_factory.h"
+#include "ui/gfx/range/range.h"
+
+namespace pp {
+class Instance;
+};
+
+namespace chrome_pdf {
+
+class URLLoaderWrapperImpl : public URLLoaderWrapper {
+ public:
+  URLLoaderWrapperImpl(pp::Instance* plugin_instance,
+                       const pp::URLLoader& url_loader);
+  ~URLLoaderWrapperImpl() override;
+
+  // URLLoaderWrapper overrides:
+  int GetContentLength() const override;
+  bool IsAcceptRangesBytes() const override;
+  bool IsContentEncoded() const override;
+  std::string GetContentType() const override;
+  std::string GetContentDisposition() const override;
+  int GetStatusCode() const override;
+  bool IsMultipart() const override;
+  bool GetByteRange(int* start, int* end) const override;
+  bool GetDownloadProgress(int64_t* bytes_received,
+                           int64_t* total_bytes_to_be_received) const override;
+  void Close() override;
+  void OpenRange(const std::string& url,
+                 const std::string& referrer_url,
+                 uint32_t position,
+                 uint32_t size,
+                 const pp::CompletionCallback& cc) override;
+  void ReadResponseBody(char* buffer,
+                        int buffer_size,
+                        const pp::CompletionCallback& cc) override;
+
+  void SetResponseHeaders(const std::string& response_headers);
+
+ private:
+  class ReadStarter;
+
+  void SetHeadersFromLoader();
+  void ParseHeaders();
+  void DidOpen(int32_t result);
+  void DidRead(int32_t result);
+
+  void ReadResponseBodyImpl();
+
+  pp::Instance* const plugin_instance_;
+  pp::URLLoader url_loader_;
+  std::string response_headers_;
+
+  int content_length_ = -1;
+  bool accept_ranges_bytes_ = false;
+  bool content_encoded_ = false;
+  std::string content_type_;
+  std::string content_disposition_;
+  std::string multipart_boundary_;
+  gfx::Range byte_range_ = gfx::Range::InvalidRange();
+  bool is_multipart_ = false;
+  char* buffer_ = nullptr;
+  uint32_t buffer_size_ = 0;
+  bool multi_part_processed_ = false;
+
+  pp::CompletionCallback did_open_callback_;
+  pp::CompletionCallback did_read_callback_;
+  pp::CompletionCallbackFactory<URLLoaderWrapperImpl> callback_factory_;
+
+  std::unique_ptr<ReadStarter> read_starter_;
+
+  DISALLOW_COPY_AND_ASSIGN(URLLoaderWrapperImpl);
+};
+
+}  // namespace chrome_pdf
+
+#endif  // PDF_URL_LOADER_WRAPPER_IMPL_H_