diff options
Diffstat (limited to 'src/storage/plugins/LocalStorage.cxx')
| -rw-r--r-- | src/storage/plugins/LocalStorage.cxx | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/src/storage/plugins/LocalStorage.cxx b/src/storage/plugins/LocalStorage.cxx new file mode 100644 index 000000000..34d11569c --- /dev/null +++ b/src/storage/plugins/LocalStorage.cxx @@ -0,0 +1,218 @@ +/* + * Copyright (C) 2003-2014 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "LocalStorage.hxx" +#include "storage/StoragePlugin.hxx" +#include "storage/StorageInterface.hxx" +#include "storage/FileInfo.hxx" +#include "util/Error.hxx" +#include "fs/FileSystem.hxx" +#include "fs/AllocatedPath.hxx" +#include "fs/DirectoryReader.hxx" + +#include <string> + +class LocalDirectoryReader final : public StorageDirectoryReader { + AllocatedPath base_fs; + + DirectoryReader reader; + + std::string name_utf8; + +public: + LocalDirectoryReader(AllocatedPath &&_base_fs) + :base_fs(std::move(_base_fs)), reader(base_fs) {} + + bool HasFailed() { + return reader.HasFailed(); + } + + /* virtual methods from class StorageDirectoryReader */ + virtual const char *Read() override; + virtual bool GetInfo(bool follow, FileInfo &info, + Error &error) override; +}; + +class LocalStorage final : public Storage { + const AllocatedPath base_fs; + const std::string base_utf8; + +public: + explicit LocalStorage(Path _base_fs) + :base_fs(_base_fs), base_utf8(base_fs.ToUTF8()) { + assert(!base_fs.IsNull()); + assert(!base_utf8.empty()); + } + + /* virtual methods from class Storage */ + virtual bool GetInfo(const char *uri_utf8, bool follow, FileInfo &info, + Error &error) override; + + virtual StorageDirectoryReader *OpenDirectory(const char *uri_utf8, + Error &error) override; + + virtual std::string MapUTF8(const char *uri_utf8) const override; + + virtual AllocatedPath MapFS(const char *uri_utf8) const override; + + virtual const char *MapToRelativeUTF8(const char *uri_utf8) const override; + +private: + AllocatedPath MapFS(const char *uri_utf8, Error &error) const; +}; + +static bool +Stat(Path path, bool follow, FileInfo &info, Error &error) +{ + struct stat st; + if (!StatFile(path, st, follow)) { + error.SetErrno(); + + const auto path_utf8 = path.ToUTF8(); + error.FormatPrefix("Failed to stat %s: ", path_utf8.c_str()); + return false; + } + + if (S_ISREG(st.st_mode)) + info.type = FileInfo::Type::REGULAR; + else if (S_ISDIR(st.st_mode)) + info.type = FileInfo::Type::DIRECTORY; + else + info.type = FileInfo::Type::OTHER; + + info.size = st.st_size; + info.mtime = st.st_mtime; + info.device = st.st_dev; + info.inode = st.st_ino; + return true; +} + +std::string +LocalStorage::MapUTF8(const char *uri_utf8) const +{ + assert(uri_utf8 != nullptr); + + if (*uri_utf8 == 0) + return base_utf8; + + return PathTraitsUTF8::Build(base_utf8.c_str(), uri_utf8); +} + +AllocatedPath +LocalStorage::MapFS(const char *uri_utf8, Error &error) const +{ + assert(uri_utf8 != nullptr); + + if (*uri_utf8 == 0) + return base_fs; + + AllocatedPath path_fs = AllocatedPath::FromUTF8(uri_utf8, error); + if (!path_fs.IsNull()) + path_fs = AllocatedPath::Build(base_fs, path_fs); + + return path_fs; +} + +AllocatedPath +LocalStorage::MapFS(const char *uri_utf8) const +{ + return MapFS(uri_utf8, IgnoreError()); +} + +const char * +LocalStorage::MapToRelativeUTF8(const char *uri_utf8) const +{ + return PathTraitsUTF8::Relative(base_utf8.c_str(), uri_utf8); +} + +bool +LocalStorage::GetInfo(const char *uri_utf8, bool follow, FileInfo &info, + Error &error) +{ + AllocatedPath path_fs = MapFS(uri_utf8, error); + if (path_fs.IsNull()) + return false; + + return Stat(path_fs, follow, info, error); +} + +StorageDirectoryReader * +LocalStorage::OpenDirectory(const char *uri_utf8, Error &error) +{ + AllocatedPath path_fs = MapFS(uri_utf8, error); + if (path_fs.IsNull()) + return nullptr; + + LocalDirectoryReader *reader = + new LocalDirectoryReader(std::move(path_fs)); + if (reader->HasFailed()) { + error.FormatErrno("Failed to open '%s'", uri_utf8); + delete reader; + return nullptr; + } + + return reader; +} + +gcc_pure +static bool +SkipNameFS(const char *name_fs) +{ + return name_fs[0] == '.' && + (name_fs[1] == 0 || + (name_fs[1] == '.' && name_fs[2] == 0)); +} + +const char * +LocalDirectoryReader::Read() +{ + while (reader.ReadEntry()) { + const Path name_fs = reader.GetEntry(); + if (SkipNameFS(name_fs.c_str())) + continue; + + name_utf8 = name_fs.ToUTF8(); + if (name_utf8.empty()) + continue; + + return name_utf8.c_str(); + } + + return nullptr; +} + +bool +LocalDirectoryReader::GetInfo(bool follow, FileInfo &info, Error &error) +{ + const AllocatedPath path_fs = + AllocatedPath::Build(base_fs, reader.GetEntry()); + return Stat(path_fs, follow, info, error); +} + +Storage * +CreateLocalStorage(Path base_fs) +{ + return new LocalStorage(base_fs); +} + +const StoragePlugin local_storage_plugin = { + "local", + nullptr, +}; |