90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
// Copyright (c) 2015 GitHub, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#include "atom/common/asar/asar_util.h"
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#include <map>
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#include <string>
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#include "atom/common/asar/archive.h"
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#include "base/files/file_path.h"
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#include "base/files/file_util.h"
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#include "base/lazy_instance.h"
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#include "base/stl_util.h"
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namespace asar {
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namespace {
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// The global instance of ArchiveMap, will be destroyed on exit.
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typedef std::map<base::FilePath, std::shared_ptr<Archive>> ArchiveMap;
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static base::LazyInstance<ArchiveMap> g_archive_map = LAZY_INSTANCE_INITIALIZER;
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const base::FilePath::CharType kAsarExtension[] = FILE_PATH_LITERAL(".asar");
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} // namespace
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std::shared_ptr<Archive> GetOrCreateAsarArchive(const base::FilePath& path) {
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ArchiveMap& archive_map = *g_archive_map.Pointer();
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if (!ContainsKey(archive_map, path)) {
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std::shared_ptr<Archive> archive(new Archive(path));
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if (!archive->Init())
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return nullptr;
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archive_map[path] = archive;
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}
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return archive_map[path];
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}
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bool GetAsarArchivePath(const base::FilePath& full_path,
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base::FilePath* asar_path,
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base::FilePath* relative_path) {
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base::FilePath iter = full_path;
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while (true) {
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base::FilePath dirname = iter.DirName();
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if (iter.MatchesExtension(kAsarExtension))
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break;
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else if (iter == dirname)
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return false;
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iter = dirname;
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}
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base::FilePath tail;
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if (!iter.AppendRelativePath(full_path, &tail))
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return false;
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*asar_path = iter;
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*relative_path = tail;
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return true;
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}
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bool ReadFileToString(const base::FilePath& path, std::string* contents) {
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base::FilePath asar_path, relative_path;
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if (!GetAsarArchivePath(path, &asar_path, &relative_path))
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return base::ReadFileToString(path, contents);
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std::shared_ptr<Archive> archive = GetOrCreateAsarArchive(asar_path);
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if (!archive)
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return false;
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Archive::FileInfo info;
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if (!archive->GetFileInfo(relative_path, &info))
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return false;
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if (info.unpacked) {
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base::FilePath real_path;
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// For unpacked file it will return the real path instead of doing the copy.
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archive->CopyFileOut(relative_path, &real_path);
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return base::ReadFileToString(real_path, contents);
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}
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base::File src(asar_path, base::File::FLAG_OPEN | base::File::FLAG_READ);
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if (!src.IsValid())
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return false;
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contents->resize(info.size);
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return static_cast<int>(info.size) == src.Read(
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info.offset, const_cast<char*>(contents->data()), contents->size());
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}
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} // namespace asar
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