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// Copyright 2013 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 "base/file_util.h"
#include "base/files/file_enumerator.h"
#include "base/threading/worker_pool.h"
#include "chrome/browser/extensions/api/image_writer_private/error_messages.h"
#include "chrome/browser/extensions/api/image_writer_private/operation.h"
#include "chrome/browser/extensions/api/image_writer_private/operation_manager.h"
#include "content/public/browser/browser_thread.h"
#include "third_party/zlib/google/zip.h"
namespace extensions {
namespace image_writer {
using content::BrowserThread;
const int kBurningBlockSize = 8 * 1024; // 8 KiB
void Operation::WriteStart() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
if (IsCancelled()) {
return;
}
if (image_path_.empty()) {
Error(error::kImageNotFound);
return;
}
DVLOG(1) << "Starting write of " << image_path_.value()
<< " to " << storage_unit_id_;
SetStage(image_writer_api::STAGE_WRITE);
// TODO (haven): Unmount partitions before writing. http://crbug.com/284834
scoped_ptr<image_writer_utils::ImageReader> reader(
new image_writer_utils::ImageReader());
scoped_ptr<image_writer_utils::ImageWriter> writer(
new image_writer_utils::ImageWriter());
base::FilePath storage_path(storage_unit_id_);
if (reader->Open(image_path_)) {
if (!writer->Open(storage_path)) {
reader->Close();
Error(error::kOpenDevice);
return;
}
} else {
Error(error::kOpenImage);
return;
}
BrowserThread::PostTask(
BrowserThread::FILE,
FROM_HERE,
base::Bind(&Operation::WriteChunk,
this,
base::Passed(&reader),
base::Passed(&writer),
0));
}
void Operation::WriteChunk(
scoped_ptr<image_writer_utils::ImageReader> reader,
scoped_ptr<image_writer_utils::ImageWriter> writer,
int64 bytes_written) {
if (IsCancelled()) {
WriteCleanUp(reader.Pass(), writer.Pass());
return;
}
char buffer[kBurningBlockSize];
int64 image_size = reader->GetSize();
int len = reader->Read(buffer, kBurningBlockSize);
if (len > 0) {
if (writer->Write(buffer, len) == len) {
int percent_prev = kProgressComplete * bytes_written / image_size;
int percent_curr = kProgressComplete * (bytes_written + len) / image_size;
if (percent_curr > percent_prev) {
SetProgress(percent_curr);
}
BrowserThread::PostTask(
BrowserThread::FILE,
FROM_HERE,
base::Bind(&Operation::WriteChunk,
this,
base::Passed(&reader),
base::Passed(&writer),
bytes_written + len));
} else {
WriteCleanUp(reader.Pass(), writer.Pass());
Error(error::kWriteImage);
}
} else if (len == 0) {
if (bytes_written == image_size) {
if (WriteCleanUp(reader.Pass(), writer.Pass())) {
BrowserThread::PostTask(
BrowserThread::FILE,
FROM_HERE,
base::Bind(&Operation::WriteComplete,
this));
}
} else {
WriteCleanUp(reader.Pass(), writer.Pass());
Error(error::kPrematureEndOfFile);
}
} else { // len < 0
WriteCleanUp(reader.Pass(), writer.Pass());
Error(error::kReadImage);
}
}
bool Operation::WriteCleanUp(
scoped_ptr<image_writer_utils::ImageReader> reader,
scoped_ptr<image_writer_utils::ImageWriter> writer) {
bool success = true;
if (!reader->Close()) {
Error(error::kCloseImage);
success = false;
}
if (!writer->Close()) {
Error(error::kCloseDevice);
success = false;
}
return success;
}
void Operation::WriteComplete() {
DVLOG(2) << "Completed write of " << image_path_.value();
SetProgress(kProgressComplete);
BrowserThread::PostTask(
BrowserThread::FILE,
FROM_HERE,
base::Bind(&Operation::VerifyWriteStart,
this));
}
void Operation::VerifyWriteStart() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
if (IsCancelled()) {
return;
}
DVLOG(1) << "Starting verification stage.";
SetStage(image_writer_api::STAGE_VERIFYWRITE);
scoped_ptr<base::FilePath> image_path(new base::FilePath(image_path_));
GetMD5SumOfFile(
image_path.Pass(),
-1,
0, // progress_offset
50, // progress_scale
base::Bind(&Operation::VerifyWriteStage2,
this));
}
void Operation::VerifyWriteStage2(
scoped_ptr<std::string> image_hash) {
DVLOG(1) << "Building MD5 sum of device: " << storage_unit_id_;
int64 image_size;
scoped_ptr<base::FilePath> device_path(new base::FilePath(storage_unit_id_));
if (!file_util::GetFileSize(image_path_, &image_size)){
Error(error::kImageSize);
return;
}
GetMD5SumOfFile(
device_path.Pass(),
image_size,
50, // progress_offset
50, // progress_scale
base::Bind(&Operation::VerifyWriteCompare,
this,
base::Passed(&image_hash)));
}
void Operation::VerifyWriteCompare(
scoped_ptr<std::string> image_hash,
scoped_ptr<std::string> device_hash) {
DVLOG(1) << "Comparing hashes: " << *image_hash << " vs " << *device_hash;
if (*image_hash != *device_hash) {
Error(error::kWriteHash);
return;
}
DVLOG(2) << "Completed write verification of " << image_path_.value();
SetProgress(kProgressComplete);
Finish();
}
} // namespace image_writer
} // namespace extensions
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