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// 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.
#include "net/base/upload_data_stream.h"
#include "base/file_util.h"
#include "base/logging.h"
#include "base/threading/thread_restrictions.h"
#include "net/base/file_stream.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
namespace net {
const size_t UploadDataStream::kBufferSize = 16384;
bool UploadDataStream::merge_chunks_ = true;
UploadDataStream::~UploadDataStream() {
}
UploadDataStream* UploadDataStream::Create(UploadData* data, int* error_code) {
scoped_ptr<UploadDataStream> stream(new UploadDataStream(data));
int rv = stream->FillBuffer();
if (error_code)
*error_code = rv;
if (rv != OK)
return NULL;
return stream.release();
}
// static
size_t UploadDataStream::GetBufferSize() {
return kBufferSize;
}
void UploadDataStream::MarkConsumedAndFillBuffer(size_t num_bytes) {
DCHECK_LE(num_bytes, buf_len_);
DCHECK(!eof_);
if (num_bytes) {
buf_len_ -= num_bytes;
// Move the remaining data to the beginning.
if (buf_len_ > 0)
memmove(buf_->data(), buf_->data() + num_bytes, buf_len_);
}
FillBuffer();
current_position_ += num_bytes;
}
UploadDataStream::UploadDataStream(UploadData* upload_data)
: upload_data_(upload_data),
buf_(new IOBuffer(kBufferSize)),
buf_len_(0),
element_index_(0),
element_offset_(0),
element_file_bytes_remaining_(0),
total_size_(upload_data->GetContentLength()),
current_position_(0),
eof_(false) {
}
int UploadDataStream::FillBuffer() {
std::vector<UploadData::Element>& elements = *upload_data_->elements();
while (buf_len_ < kBufferSize && element_index_ < elements.size()) {
bool advance_to_next_element = false;
// This is not const as GetContentLength() is not const.
UploadData::Element& element = elements[element_index_];
const size_t free_buffer_space = kBufferSize - buf_len_;
if (element.type() == UploadData::TYPE_BYTES ||
element.type() == UploadData::TYPE_CHUNK) {
const std::vector<char>& element_data = element.bytes();
const size_t num_bytes_left_in_element =
element_data.size() - element_offset_;
const size_t num_bytes_to_copy = std::min(num_bytes_left_in_element,
free_buffer_space);
// Check if we have anything to copy first, because we are getting
// the address of an element in |element_data| and that will throw an
// exception if |element_data| is an empty vector.
if (num_bytes_to_copy > 0) {
memcpy(buf_->data() + buf_len_,
&element_data[element_offset_],
num_bytes_to_copy);
buf_len_ += num_bytes_to_copy;
element_offset_ += num_bytes_to_copy;
}
// Advance to the next element if we have consumed all data in the
// current element.
if (element_offset_ == element_data.size())
advance_to_next_element = true;
} else {
DCHECK(element.type() == UploadData::TYPE_FILE);
// Open the file of the current element if not yet opened.
if (!element_file_stream_.get()) {
// If the underlying file has been changed, treat it as error.
// Note that the expected modification time from WebKit is based on
// time_t precision. So we have to convert both to time_t to compare.
if (!element.expected_file_modification_time().is_null()) {
base::PlatformFileInfo info;
if (file_util::GetFileInfo(element.file_path(), &info) &&
element.expected_file_modification_time().ToTimeT() !=
info.last_modified.ToTimeT()) {
return ERR_UPLOAD_FILE_CHANGED;
}
}
element_file_bytes_remaining_ = element.GetContentLength();
element_file_stream_.reset(element.NewFileStreamForReading());
}
const int num_bytes_to_read =
static_cast<int>(std::min(element_file_bytes_remaining_,
static_cast<uint64>(free_buffer_space)));
if (num_bytes_to_read > 0) {
int num_bytes_consumed = 0;
// Temporarily allow until fix: http://crbug.com/72001.
base::ThreadRestrictions::ScopedAllowIO allow_io;
// element_file_stream_.get() is NULL if the target file is
// missing or not readable.
if (element_file_stream_.get()) {
num_bytes_consumed =
element_file_stream_->Read(buf_->data() + buf_len_,
num_bytes_to_read,
CompletionCallback());
}
if (num_bytes_consumed <= 0) {
// If there's less data to read than we initially observed, then
// pad with zero. Otherwise the server will hang waiting for the
// rest of the data.
memset(buf_->data() + buf_len_, 0, num_bytes_to_read);
num_bytes_consumed = num_bytes_to_read;
}
buf_len_ += num_bytes_consumed;
element_file_bytes_remaining_ -= num_bytes_consumed;
}
// Advance to the next element if we have consumed all data in the
// current element.
if (element_file_bytes_remaining_ == 0)
advance_to_next_element = true;
}
if (advance_to_next_element)
AdvanceToNextElement();
if (is_chunked() && !merge_chunks_)
break;
}
eof_ = IsEOF();
return OK;
}
void UploadDataStream::AdvanceToNextElement() {
++element_index_;
element_offset_ = 0;
element_file_bytes_remaining_ = 0;
element_file_stream_.reset();
}
bool UploadDataStream::IsEOF() const {
const std::vector<UploadData::Element>& elements = *upload_data_->elements();
// Check if all elements are consumed and the buffer is empty.
if (element_index_ == elements.size() && !buf_len_) {
// If the upload data is chunked, check if the last element is the
// last chunk.
if (!upload_data_->is_chunked() ||
(!elements.empty() && elements.back().is_last_chunk())) {
return true;
}
}
return false;
}
bool UploadDataStream::IsOnLastChunk() const {
const std::vector<UploadData::Element>& elements = *upload_data_->elements();
DCHECK(upload_data_->is_chunked());
return (eof_ ||
(!elements.empty() &&
element_index_ == elements.size() &&
elements.back().is_last_chunk()));
}
bool UploadDataStream::IsInMemory() const {
return upload_data_->IsInMemory();
}
} // namespace net
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