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// Copyright 2017 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 "third_party/zlib/google/zip_writer.h"
#include "base/files/file.h"
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "third_party/zlib/google/zip_internal.h"
namespace zip {
namespace internal {
namespace {
// Numbers of pending entries that trigger writting them to the ZIP file.
constexpr size_t kMaxPendingEntriesCount = 50;
bool AddFileContentToZip(zipFile zip_file,
base::File file,
const base::FilePath& file_path) {
int num_bytes;
char buf[zip::internal::kZipBufSize];
do {
num_bytes = file.ReadAtCurrentPos(buf, zip::internal::kZipBufSize);
if (num_bytes > 0) {
if (zipWriteInFileInZip(zip_file, buf, num_bytes) != ZIP_OK) {
DLOG(ERROR) << "Could not write data to zip for path "
<< file_path.value();
return false;
}
}
} while (num_bytes > 0);
return true;
}
bool OpenNewFileEntry(zipFile zip_file,
const base::FilePath& path,
bool is_directory,
base::Time last_modified) {
std::string str_path = path.AsUTF8Unsafe();
#if defined(OS_WIN)
base::ReplaceSubstringsAfterOffset(&str_path, 0u, "\\", "/");
#endif
if (is_directory)
str_path += "/";
return zip::internal::ZipOpenNewFileInZip(zip_file, str_path, last_modified);
}
bool CloseNewFileEntry(zipFile zip_file) {
return zipCloseFileInZip(zip_file) == ZIP_OK;
}
bool AddFileEntryToZip(zipFile zip_file,
const base::FilePath& path,
base::File file) {
base::File::Info file_info;
if (!file.GetInfo(&file_info))
return false;
if (!OpenNewFileEntry(zip_file, path, /*is_directory=*/false,
file_info.last_modified))
return false;
bool success = AddFileContentToZip(zip_file, std::move(file), path);
if (!CloseNewFileEntry(zip_file))
return false;
return success;
}
bool AddDirectoryEntryToZip(zipFile zip_file,
const base::FilePath& path,
base::Time last_modified) {
return OpenNewFileEntry(zip_file, path, /*is_directory=*/true,
last_modified) &&
CloseNewFileEntry(zip_file);
}
} // namespace
#if defined(OS_POSIX)
// static
std::unique_ptr<ZipWriter> ZipWriter::CreateWithFd(
int zip_file_fd,
const base::FilePath& root_dir,
FileAccessor* file_accessor) {
DCHECK(zip_file_fd != base::kInvalidPlatformFile);
zipFile zip_file =
internal::OpenFdForZipping(zip_file_fd, APPEND_STATUS_CREATE);
if (!zip_file) {
DLOG(ERROR) << "Couldn't create ZIP file for FD " << zip_file_fd;
return nullptr;
}
return std::unique_ptr<ZipWriter>(
new ZipWriter(zip_file, root_dir, file_accessor));
}
#endif
// static
std::unique_ptr<ZipWriter> ZipWriter::Create(
const base::FilePath& zip_file_path,
const base::FilePath& root_dir,
FileAccessor* file_accessor) {
DCHECK(!zip_file_path.empty());
zipFile zip_file = internal::OpenForZipping(zip_file_path.AsUTF8Unsafe(),
APPEND_STATUS_CREATE);
if (!zip_file) {
DLOG(ERROR) << "Couldn't create ZIP file at path " << zip_file_path;
return nullptr;
}
return std::unique_ptr<ZipWriter>(
new ZipWriter(zip_file, root_dir, file_accessor));
}
ZipWriter::ZipWriter(zipFile zip_file,
const base::FilePath& root_dir,
FileAccessor* file_accessor)
: zip_file_(zip_file), root_dir_(root_dir), file_accessor_(file_accessor) {}
ZipWriter::~ZipWriter() {
DCHECK(pending_entries_.empty());
}
bool ZipWriter::WriteEntries(const std::vector<base::FilePath>& paths) {
return AddEntries(paths) && Close();
}
bool ZipWriter::AddEntries(const std::vector<base::FilePath>& paths) {
DCHECK(zip_file_);
pending_entries_.insert(pending_entries_.end(), paths.begin(), paths.end());
return FlushEntriesIfNeeded(/*force=*/false);
}
bool ZipWriter::Close() {
bool success = FlushEntriesIfNeeded(/*force=*/true) &&
zipClose(zip_file_, nullptr) == ZIP_OK;
zip_file_ = nullptr;
return success;
}
bool ZipWriter::FlushEntriesIfNeeded(bool force) {
if (pending_entries_.size() < kMaxPendingEntriesCount && !force)
return true;
while (pending_entries_.size() >= kMaxPendingEntriesCount ||
(force && !pending_entries_.empty())) {
size_t entry_count =
std::min(pending_entries_.size(), kMaxPendingEntriesCount);
std::vector<base::FilePath> relative_paths;
std::vector<base::FilePath> absolute_paths;
relative_paths.insert(relative_paths.begin(), pending_entries_.begin(),
pending_entries_.begin() + entry_count);
for (auto iter = pending_entries_.begin();
iter != pending_entries_.begin() + entry_count; ++iter) {
// The FileAccessor requires absolute paths.
absolute_paths.push_back(root_dir_.Append(*iter));
}
pending_entries_.erase(pending_entries_.begin(),
pending_entries_.begin() + entry_count);
// We don't know which paths are files and which ones are directories, and
// we want to avoid making a call to file_accessor_ for each entry. Open the
// files instead, invalid files are returned for directories.
std::vector<base::File> files =
file_accessor_->OpenFilesForReading(absolute_paths);
DCHECK_EQ(files.size(), relative_paths.size());
for (size_t i = 0; i < files.size(); i++) {
const base::FilePath& relative_path = relative_paths[i];
const base::FilePath& absolute_path = absolute_paths[i];
base::File file = std::move(files[i]);
if (file.IsValid()) {
if (!AddFileEntryToZip(zip_file_, relative_path, std::move(file))) {
LOG(ERROR) << "Failed to write file " << relative_path.value()
<< " to ZIP file.";
return false;
}
} else {
// Missing file or directory case.
base::Time last_modified =
file_accessor_->GetLastModifiedTime(absolute_path);
if (last_modified.is_null()) {
LOG(ERROR) << "Failed to write entry " << relative_path.value()
<< " to ZIP file.";
return false;
}
DCHECK(file_accessor_->DirectoryExists(absolute_path));
if (!AddDirectoryEntryToZip(zip_file_, relative_path, last_modified)) {
LOG(ERROR) << "Failed to write directory " << relative_path.value()
<< " to ZIP file.";
return false;
}
}
}
}
return true;
}
} // namespace internal
} // namespace zip
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