1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "net/base/upload_bytes_element_reader.h"
6
7#include "base/logging.h"
8#include "base/stl_util.h"
9#include "net/base/io_buffer.h"
10#include "net/base/net_errors.h"
11
12namespace net {
13
14UploadBytesElementReader::UploadBytesElementReader(const char* bytes,
15                                                   uint64 length)
16    : bytes_(bytes),
17      length_(length),
18      offset_(0) {
19}
20
21UploadBytesElementReader::~UploadBytesElementReader() {
22}
23
24const UploadBytesElementReader*
25UploadBytesElementReader::AsBytesReader() const {
26  return this;
27}
28
29int UploadBytesElementReader::Init(const CompletionCallback& callback) {
30  offset_ = 0;
31  return OK;
32}
33
34uint64 UploadBytesElementReader::GetContentLength() const {
35  return length_;
36}
37
38uint64 UploadBytesElementReader::BytesRemaining() const {
39  return length_ - offset_;
40}
41
42bool UploadBytesElementReader::IsInMemory() const {
43  return true;
44}
45
46int UploadBytesElementReader::Read(IOBuffer* buf,
47                                   int buf_length,
48                                   const CompletionCallback& callback) {
49  DCHECK_LT(0, buf_length);
50
51  const size_t num_bytes_to_read =
52      std::min(BytesRemaining(), static_cast<uint64>(buf_length));
53
54  // Check if we have anything to copy first, because we are getting
55  // the address of an element in |bytes_| and that will throw an
56  // exception if |bytes_| is an empty vector.
57  if (num_bytes_to_read > 0)
58    memcpy(buf->data(), bytes_ + offset_, num_bytes_to_read);
59
60  offset_ += num_bytes_to_read;
61  return num_bytes_to_read;
62}
63
64
65UploadOwnedBytesElementReader::UploadOwnedBytesElementReader(
66    std::vector<char>* data)
67    : UploadBytesElementReader(vector_as_array(data), data->size()) {
68  data_.swap(*data);
69}
70
71UploadOwnedBytesElementReader::~UploadOwnedBytesElementReader() {}
72
73UploadOwnedBytesElementReader*
74UploadOwnedBytesElementReader::CreateWithString(const std::string& string) {
75  std::vector<char> data(string.begin(), string.end());
76  return new UploadOwnedBytesElementReader(&data);
77}
78
79}  // namespace net
80