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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/extensions/api/image_writer_private/zip_extractor.h"
#include <algorithm>
#include <memory>
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/task/thread_pool.h"
#include "chrome/browser/extensions/api/image_writer_private/error_constants.h"
namespace extensions {
namespace image_writer {
namespace {
// https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
constexpr unsigned char kExpectedMagic[4] = {'P', 'K', 0x03, 0x04};
} // namespace
// static
bool ZipExtractor::IsZipFile(const base::FilePath& image_path) {
base::File infile(image_path, base::File::FLAG_OPEN | base::File::FLAG_READ |
base::File::FLAG_WIN_EXCLUSIVE_WRITE |
base::File::FLAG_WIN_SHARE_DELETE);
if (!infile.IsValid())
return false;
constexpr size_t kExpectedSize = sizeof(kExpectedMagic);
std::array<unsigned char, kExpectedSize> actual_magic = {};
if (infile.ReadAtCurrentPos(actual_magic).value_or(0) != kExpectedSize) {
return false;
}
return std::equal(std::begin(kExpectedMagic), std::end(kExpectedMagic),
actual_magic.begin());
}
// static
void ZipExtractor::Extract(ExtractionProperties properties) {
// ZipExtractor manages its own lifetime, and will delete itself when it
// completes.
ZipExtractor* extractor = new ZipExtractor(std::move(properties));
extractor->ExtractImpl();
}
ZipExtractor::ZipExtractor(ExtractionProperties properties)
: properties_(std::move(properties)) {}
ZipExtractor::~ZipExtractor() = default;
void ZipExtractor::ExtractImpl() {
if (!zip_reader_.Open(properties_.image_path)) {
// |this| will be deleted inside.
OnError(error::kUnzipGenericError);
return;
}
// If the ZIP can be opened, it shouldn't be empty.
DCHECK_GT(zip_reader_.num_entries(), 0);
if (zip_reader_.num_entries() != 1) {
// |this| will be deleted inside.
OnError(error::kUnzipInvalidArchive);
return;
}
// Create a new target to unzip to. The original file is opened by
// |zip_reader_|.
const zip::ZipReader::Entry* const entry = zip_reader_.Next();
if (!entry) {
// |this| will be deleted inside.
OnError(error::kTempDirError);
return;
}
base::FilePath out_image_path =
properties_.temp_dir_path.Append(entry->path.BaseName());
std::move(properties_.open_callback).Run(out_image_path);
// |this| will be deleted when OnComplete or OnError is called.
zip_reader_.ExtractCurrentEntryToFilePathAsync(
out_image_path,
base::BindOnce(&ZipExtractor::OnComplete, weak_ptr_factory_.GetWeakPtr()),
base::BindOnce(&ZipExtractor::OnError, weak_ptr_factory_.GetWeakPtr(),
error::kUnzipGenericError),
base::BindRepeating(properties_.progress_callback, entry->original_size));
}
void ZipExtractor::OnError(const std::string& error) {
std::move(properties_.failure_callback).Run(error);
delete this;
}
void ZipExtractor::OnComplete() {
std::move(properties_.complete_callback).Run();
delete this;
}
} // namespace image_writer
} // namespace extensions
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