zip_reader.h | Explore in Territory

/*
 * Copyright (C) 2022 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef SRC_TRACE_PROCESSOR_UTIL_ZIP_READER_H_
#define SRC_TRACE_PROCESSOR_UTIL_ZIP_READER_H_

#include <cstddef>
#include <cstdint>
#include <functional>
#include <optional>
#include <string>
#include <utility>
#include <vector>

#include "perfetto/base/status.h"
#include "perfetto/ext/base/status_or.h"
#include "perfetto/ext/base/string_view.h"
#include "perfetto/trace_processor/trace_blob_view.h"
#include "src/trace_processor/util/gzip_utils.h"
#include "src/trace_processor/util/trace_blob_view_reader.h"

// ZipReader allows to read Zip files in a streaming fashion.
// Key features:
// - Read-only access, there is no ZipWriter.
// - Files can be processed as they are seen in the zip archive, without needing
//   to see the whole .zip file first.
// - It does not read the final zip central directory. Only the metadata in the
//   inline file headers is exposed.
// - Only the compressed payload is kept around in memory.
// - Supports line-based streaming for compressed text files (e.g. logs). This
//   enables line-based processing of compressed logs without having to
//   decompress fully the individual text file in memory.
// - Does NOT support zip64, encryption and other advanced zip file features.
// - It is not suitable for security-sensitive contexts. E.g. it doesn't deal
//   with zip path traversal attacks (the same file showing up twice with two
//   different payloads).
//
// Possible future features:
// - The user could setup a filter (a glob, or a callback) to select the
//   interesting files (e.g. *.txt) and skip the appending of the other entries.
//   This would avoid completely the cost of keeping in memory the compressed
//   payload of unwanted files (e.g. dumpstate.bin in BRs).

namespace perfetto::trace_processor::util {

class ZipReader;

constexpr size_t kZipFileHdrSize = …;

// Holds the metadata and compressed payload of a zip file and allows
// decompression. The lifecycle of a ZipFile is completely independent of the
// ZipReader that created it. ZipFile(s) can be std::move(d) around and even
// outlive the ZipReader.
class ZipFile { … };

class ZipReader { … };

}  // namespace perfetto::trace_processor::util

#endif  // SRC_TRACE_PROCESSOR_UTIL_ZIP_READER_H_
chromium/third_party/perfetto/src/trace_processor/util/zip_reader.h
