mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 22:36:09 +03:00
71 lines
2.5 KiB
C++
71 lines
2.5 KiB
C++
// Copyright (c) 2012 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_ELEMENT_READER_H_
|
|
#define NET_BASE_UPLOAD_ELEMENT_READER_H_
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "base/macros.h"
|
|
#include "net/base/completion_once_callback.h"
|
|
#include "net/base/net_export.h"
|
|
|
|
namespace net {
|
|
|
|
class IOBuffer;
|
|
class UploadBytesElementReader;
|
|
class UploadFileElementReader;
|
|
|
|
// An interface to read an upload data element.
|
|
class NET_EXPORT UploadElementReader {
|
|
public:
|
|
UploadElementReader() {}
|
|
virtual ~UploadElementReader() {}
|
|
|
|
// Returns this instance's pointer as UploadBytesElementReader when possible,
|
|
// otherwise returns NULL.
|
|
virtual const UploadBytesElementReader* AsBytesReader() const;
|
|
|
|
// Returns this instance's pointer as UploadFileElementReader when possible,
|
|
// otherwise returns NULL.
|
|
virtual const UploadFileElementReader* AsFileReader() const;
|
|
|
|
// This function must be called before calling any other method. It is not
|
|
// valid to call any method (other than the destructor) if Init() fails.
|
|
// This method can be called multiple times. Calling this results in resetting
|
|
// the state (i.e. the stream is rewound), and any previously pending Init()
|
|
// or Read() calls are aborted.
|
|
//
|
|
// Initializes the instance synchronously when possible, otherwise does
|
|
// initialization aynschronously, returns ERR_IO_PENDING and runs callback.
|
|
// Calling this method again after a Init() success results in resetting the
|
|
// state.
|
|
virtual int Init(CompletionOnceCallback callback) = 0;
|
|
|
|
// Returns the byte-length of the element. For files that do not exist, 0
|
|
// is returned. This is done for consistency with Mozilla.
|
|
virtual uint64_t GetContentLength() const = 0;
|
|
|
|
// Returns the number of bytes remaining to read.
|
|
virtual uint64_t BytesRemaining() const = 0;
|
|
|
|
// Returns true if the upload element is entirely in memory.
|
|
// The default implementation returns false.
|
|
virtual bool IsInMemory() const;
|
|
|
|
// Reads up to |buf_length| bytes synchronously and returns the number of
|
|
// bytes read or error code when possible, otherwise, returns ERR_IO_PENDING
|
|
// and runs |callback| with the result. |buf_length| must be greater than 0.
|
|
virtual int Read(IOBuffer* buf,
|
|
int buf_length,
|
|
CompletionOnceCallback callback) = 0;
|
|
|
|
private:
|
|
DISALLOW_COPY_AND_ASSIGN(UploadElementReader);
|
|
};
|
|
|
|
} // namespace net
|
|
|
|
#endif // NET_BASE_UPLOAD_ELEMENT_READER_H_
|