77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
//
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// Copyright (C) 2021 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include <string>
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#include <erofs/dir.h>
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#include "update_engine/common/utils.h"
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// The only way to pass extra information to callback function is to use a
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// wrapper type for erofs_dir_context. So here we go
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struct erofs_iterate_dir_context {
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struct erofs_dir_context ctx;
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std::string path;
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void* arg;
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};
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// Dear compiler, please don't reoder fields inside erofs_iterate_dir_context.
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// Because EROFS expects us to pass a wrapper type. So |ctx| member of
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// erofs_iterate_dir_context must be put at 0 offset.
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static_assert(offsetof(erofs_iterate_dir_context, ctx) == 0);
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// Callable shold be a functor like
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// std::function<int(struct erofs_inode_info *)>
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template <typename Callable>
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int erofs_iterate_root_dir(const struct erofs_sb_info* sbi, Callable cb) {
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struct erofs_inode dir {
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.nid = sbi->root_nid
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};
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int err = erofs_read_inode_from_disk(&dir);
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if (err) {
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LOG(ERROR) << "Failed to read inode " << sbi->root_nid << " from disk";
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return err;
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}
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struct erofs_iterate_dir_context param {
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.ctx.dir = &dir, .ctx.pnid = sbi->root_nid,
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.ctx.cb = [](struct erofs_dir_context* arg) -> int {
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auto ctx = reinterpret_cast<erofs_iterate_dir_context*>(arg);
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auto& path = ctx->path;
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const auto len = path.size();
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path.push_back('/');
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path.insert(
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path.end(), ctx->ctx.dname, ctx->ctx.dname + ctx->ctx.de_namelen);
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auto cb = static_cast<Callable*>(ctx->arg);
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const auto err = (*cb)(ctx);
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if (!err && !ctx->ctx.dot_dotdot && ctx->ctx.de_ftype == EROFS_FT_DIR) {
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// recursively walk into subdirectories
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erofs_inode dir{.nid = ctx->ctx.de_nid};
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if (const int err = erofs_read_inode_from_disk(&dir); err) {
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return err;
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}
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ctx->ctx.dir = &dir;
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if (const auto err = erofs_iterate_dir(&ctx->ctx, false); err) {
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return err;
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}
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}
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path.resize(len);
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return err;
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},
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.arg = &cb,
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};
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return erofs_iterate_dir(¶m.ctx, false);
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}
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