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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_element.h"
#include <algorithm>
#include "base/file_util.h"
#include "base/threading/thread_restrictions.h"
#include "net/base/file_stream.h"
#include "net/base/net_errors.h"
namespace net {
UploadElement::UploadElement()
: type_(TYPE_BYTES),
bytes_start_(NULL),
bytes_length_(0),
file_range_offset_(0),
file_range_length_(kuint64max),
override_content_length_(false),
content_length_computed_(false),
content_length_(-1),
offset_(0),
file_stream_(NULL) {
}
UploadElement::~UploadElement() {
// In the common case |file__stream_| will be null.
if (file_stream_) {
// Temporarily allow until fix: http://crbug.com/72001.
base::ThreadRestrictions::ScopedAllowIO allow_io;
file_stream_->CloseSync();
delete file_stream_;
}
}
uint64 UploadElement::GetContentLength() {
if (override_content_length_ || content_length_computed_)
return content_length_;
if (type_ == TYPE_BYTES)
return bytes_length();
DCHECK_EQ(TYPE_FILE, type_);
DCHECK(!file_stream_);
// TODO(darin): This size calculation could be out of sync with the state of
// the file when we get around to reading it. We should probably find a way
// to lock the file or somehow protect against this error condition.
content_length_computed_ = true;
content_length_ = 0;
// We need to open the file here to decide if we should report the file's
// size or zero. We cache the open file, so that we can still read it when
// it comes time to.
file_stream_ = OpenFileStream();
if (!file_stream_)
return 0;
int64 length = 0;
if (!file_util::GetFileSize(file_path_, &length))
return 0;
if (file_range_offset_ >= static_cast<uint64>(length))
return 0; // range is beyond eof
// compensate for the offset and clip file_range_length_ to eof
content_length_ = std::min(length - file_range_offset_, file_range_length_);
return content_length_;
}
int UploadElement::ReadSync(char* buf, int buf_len) {
if (type_ == TYPE_BYTES) {
return ReadFromMemorySync(buf, buf_len);
} else if (type_ == TYPE_FILE) {
return ReadFromFileSync(buf, buf_len);
}
NOTREACHED();
return 0;
}
uint64 UploadElement::BytesRemaining() {
return GetContentLength() - offset_;
}
void UploadElement::ResetOffset() {
offset_ = 0;
// Delete the file stream if already opened, so we can reread the file from
// the beginning.
if (file_stream_) {
// Temporarily allow until fix: http://crbug.com/72001.
base::ThreadRestrictions::ScopedAllowIO allow_io;
file_stream_->CloseSync();
delete file_stream_;
file_stream_ = NULL;
}
}
FileStream* UploadElement::OpenFileStream() {
scoped_ptr<FileStream> file(new FileStream(NULL));
int64 rv = file->OpenSync(
file_path_,
base::PLATFORM_FILE_OPEN | base::PLATFORM_FILE_READ);
if (rv != OK) {
// If the file can't be opened, we'll just upload an empty file.
DLOG(WARNING) << "Failed to open \"" << file_path_.value()
<< "\" for reading: " << rv;
return NULL;
}
if (file_range_offset_) {
rv = file->SeekSync(FROM_BEGIN, file_range_offset_);
if (rv < 0) {
DLOG(WARNING) << "Failed to seek \"" << file_path_.value()
<< "\" to offset: " << file_range_offset_ << " (" << rv
<< ")";
return NULL;
}
}
return file.release();
}
int UploadElement::ReadFromMemorySync(char* buf, int buf_len) {
DCHECK_LT(0, buf_len);
DCHECK(type_ == TYPE_BYTES);
const size_t num_bytes_to_read = std::min(BytesRemaining(),
static_cast<uint64>(buf_len));
// Check if we have anything to copy first, because we are getting
// the address of an element in |bytes_| and that will throw an
// exception if |bytes_| is an empty vector.
if (num_bytes_to_read > 0)
memcpy(buf, bytes() + offset_, num_bytes_to_read);
offset_ += num_bytes_to_read;
return num_bytes_to_read;
}
int UploadElement::ReadFromFileSync(char* buf, int buf_len) {
DCHECK_LT(0, buf_len);
DCHECK_EQ(TYPE_FILE, type_);
// Open the file of the current element if not yet opened.
// In common usage, GetContentLength() opened it already.
if (!file_stream_) {
// Temporarily allow until fix: http://crbug.com/72001.
base::ThreadRestrictions::ScopedAllowIO allow_io;
file_stream_ = OpenFileStream();
}
const int num_bytes_to_read =
static_cast<int>(std::min(BytesRemaining(),
static_cast<uint64>(buf_len)));
if (num_bytes_to_read > 0) {
int num_bytes_consumed = 0;
// Temporarily allow until fix: http://crbug.com/72001.
base::ThreadRestrictions::ScopedAllowIO allow_io;
// file_stream_ is NULL if the target file is
// missing or not readable.
if (file_stream_) {
num_bytes_consumed =
file_stream_->ReadSync(buf, num_bytes_to_read);
}
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, 0, num_bytes_to_read);
}
}
offset_ += num_bytes_to_read;
return num_bytes_to_read;
}
} // namespace net
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