// 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_H_
#define PDF_URL_LOADER_WRAPPER_H_

#include <string>

#include "base/macros.h"
#include "ppapi/cpp/completion_callback.h"

namespace chrome_pdf {

class URLLoaderWrapper {
 public:
  virtual ~URLLoaderWrapper() {}

  // Returns length of content, will be -1, if it is unknown.
  virtual int GetContentLength() const = 0;
  // Returns if the response headers contains "accept-ranges".
  virtual bool IsAcceptRangesBytes() const = 0;
  // Returns if the content encoded in response.
  virtual bool IsContentEncoded() const = 0;
  // Returns response content type.
  virtual std::string GetContentType() const = 0;
  // Returns response content disposition.
  virtual std::string GetContentDisposition() const = 0;
  // Returns response status code.
  virtual int GetStatusCode() const = 0;
  // Returns if the response contains multi parts.
  virtual bool IsMultipart() const = 0;
  // If true, [start,end] - is byte range contains in response (include end).
  // If false, response contains full document, start/end will be undefined.
  virtual bool GetByteRange(int* start, int* end) const = 0;

  // Close connection.
  virtual void Close() = 0;
  // Open new connection and send http range request.
  virtual void OpenRange(const std::string& url,
                         const std::string& referrer_url,
                         uint32_t position,
                         uint32_t size,
                         const pp::CompletionCallback& cc) = 0;
  // Read the response body. The size of the buffer must be large enough to
  // hold the specified number of bytes to read.
  // This function might perform a partial read.
  virtual void ReadResponseBody(char* buffer,
                                int buffer_size,
                                const pp::CompletionCallback& cc) = 0;
  // Returns the current download progress.
  // Progress only refers to the response body and does not include the headers.
  // If false, progress is unknown, bytes_received/total_bytes_to_be_received
  // will be undefined.
  virtual bool GetDownloadProgress(
      int64_t* bytes_received,
      int64_t* total_bytes_to_be_received) const = 0;
};

}  // namespace chrome_pdf

#endif  // PDF_URL_LOADER_WRAPPER_H_