text: // Copyright 2014 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 NET_BASE_CHUNKED_UPLOAD_DATA_STREAM_H_
  #define NET_BASE_CHUNKED_UPLOAD_DATA_STREAM_H_
  
  #include <vector>
  
  #include "base/macros.h"
  #include "base/memory/ref_counted.h"
  #include "base/memory/scoped_vector.h"
  #include "net/base/completion_callback.h"
  #include "net/base/net_export.h"
  #include "net/base/upload_data_stream.h"
  
  namespace net {
  
  class IOBuffer;
  
  // Class with a push-based interface for uploading data. Buffers all data until
  // the request is completed. Not recommended for uploading large amounts of
  // seekable data, due to this buffering behavior.
  class NET_EXPORT ChunkedUploadDataStream : public UploadDataStream {
   public:
    ChunkedUploadDataStream(int64 identifier);
  
    ~ChunkedUploadDataStream() override;
  
    // Adds data to the stream. |is_done| should be true if this is the last
    // data to be appended. |data_len| must not be 0 unless |is_done| is true.
    // Once called with |is_done| being true, must never be called again.
    // TODO(mmenke):  Consider using IOBuffers instead, to reduce data copies.
    void AppendData(const char* data, int data_len, bool is_done);
  
   private:
    // UploadDataStream implementation.
    int InitInternal() override;
    int ReadInternal(IOBuffer* buf, int buf_len) override;
    void ResetInternal() override;
  
    int ReadChunk(IOBuffer* buf, int buf_len);
  
    // Index and offset of next element of |upload_data_| to be read.
    size_t read_index_;
    size_t read_offset_;
  
    // True once all data has been appended to the stream.
    bool all_data_appended_;
  
    ScopedVector<std::vector<char>> upload_data_;
  
    // Buffer to write the next read's data to. Only set when a call to
    // ReadInternal reads no data.
    scoped_refptr<IOBuffer> read_buffer_;
    int read_buffer_len_;
  
    DISALLOW_COPY_AND_ASSIGN(ChunkedUploadDataStream);
  };
  
  }  // namespace net
  
  #endif  // NET_BASE_CHUNKED_UPLOAD_DATA_STREAM_H_
  