net/base/upload_bytes_element_reader.cc

   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
  12 namespace net {
  13
  14 UploadBytesElementReader::UploadBytesElementReader(const char* bytes,
  15                                                    uint64 length)
  16     : bytes_(bytes),
  17       length_(length),
  18       offset_(0) {
  19 }
  20
  21 UploadBytesElementReader::~UploadBytesElementReader() {
  22 }
  23
  24 const UploadBytesElementReader*
  25 UploadBytesElementReader::AsBytesReader() const {
  26   return this;
  27 }
  28
  29 int UploadBytesElementReader::Init(const CompletionCallback& callback) {
  30   offset_ = 0;
  31   return OK;
  32 }
  33
  34 uint64 UploadBytesElementReader::GetContentLength() const {
  35   return length_;
  36 }
  37
  38 uint64 UploadBytesElementReader::BytesRemaining() const {
  39   return length_ - offset_;
  40 }
  41
  42 bool UploadBytesElementReader::IsInMemory() const {
  43   return true;
  44 }
  45
  46 int 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
  65 UploadOwnedBytesElementReader::UploadOwnedBytesElementReader(
  66     std::vector<char>* data)
  67     : UploadBytesElementReader(vector_as_array(data), data->size()) {
  68   data_.swap(*data);
  69 }
  70
  71 UploadOwnedBytesElementReader::~UploadOwnedBytesElementReader() {}
  72
  73 UploadOwnedBytesElementReader*
  74 UploadOwnedBytesElementReader::CreateWithString(const std::string& string) {
  75   std::vector<char> data(string.begin(), string.end());
  76   return new UploadOwnedBytesElementReader(&data);
  77 }
  78
  79 }  // namespace net