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// Copyright (c) 2010 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_UPLOAD_DATA_STREAM_H_
#define NET_BASE_UPLOAD_DATA_STREAM_H_
#include "net/base/file_stream.h"
#include "net/base/upload_data.h"
namespace net {
class IOBuffer;
class UploadDataStream {
public:
// Returns a new instance of UploadDataStream if it can be created and
// initialized successfully. If not, NULL will be returned and the error
// code will be set if the output parameter error_code is not empty.
static UploadDataStream* Create(UploadData* data, int* error_code);
~UploadDataStream();
// Returns the stream's buffer and buffer length.
IOBuffer* buf() const { return buf_; }
size_t buf_len() const { return buf_len_; }
// Call to indicate that a portion of the stream's buffer was consumed. This
// call modifies the stream's buffer so that it contains the next segment of
// the upload data to be consumed.
void DidConsume(size_t num_bytes);
// Returns the total size of the data stream and the current position.
// size() is not to be used to determine whether the stream has ended
// because it is possible for the stream to end before its size is reached,
// for example, if the file is truncated.
uint64 size() const { return total_size_; }
uint64 position() const { return current_position_; }
// Returns whether there is no more data to read, regardless of whether
// position < size.
bool eof() const { return eof_; }
private:
// Protects from public access since now we have a static creator function
// which will do both creation and initialization and might return an error.
explicit UploadDataStream(UploadData* data);
// Fills the buffer with any remaining data and sets eof_ if there was nothing
// left to fill the buffer with.
// Returns OK if the operation succeeds. Otherwise error code is returned.
int FillBuf();
UploadData* data_;
// This buffer is filled with data to be uploaded. The data to be sent is
// always at the front of the buffer. If we cannot send all of the buffer at
// once, then we memmove the remaining portion and back-fill the buffer for
// the next "write" call. buf_len_ indicates how much data is in the buffer.
enum { kBufSize = 16384 };
scoped_refptr<IOBuffer> buf_;
size_t buf_len_;
// Iterator to the upload element to be written to the send buffer next.
std::vector<UploadData::Element>::iterator next_element_;
// The byte offset into next_element_'s data buffer if the next element is
// a TYPE_BYTES element.
size_t next_element_offset_;
// A stream to the currently open file, for next_element_ if the next element
// is a TYPE_FILE element.
scoped_ptr<FileStream> next_element_stream_;
// The number of bytes remaining to be read from the currently open file
// if the next element is of TYPE_FILE.
uint64 next_element_remaining_;
// Size and current read position within the stream.
uint64 total_size_;
uint64 current_position_;
// Whether there is no data left to read.
bool eof_;
DISALLOW_COPY_AND_ASSIGN(UploadDataStream);
};
} // namespace net
#endif // NET_BASE_UPLOAD_DATA_STREAM_H_
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