118 lines
2.5 KiB
C++
118 lines
2.5 KiB
C++
/*
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* \brief Utilities to handle depot-archive paths
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* \author Norman Feske
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* \date 2017-12-18
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*/
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/*
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* Copyright (C) 2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__DEPOT__ARCHIVE_H_
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#define _INCLUDE__DEPOT__ARCHIVE_H_
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/* Genode includes */
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#include <util/string.h>
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namespace Depot {
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using namespace Genode;
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struct Archive;
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}
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struct Depot::Archive
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{
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typedef String<100> Path;
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typedef String<64> User;
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typedef String<80> Name;
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typedef String<40> Version;
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enum Type { PKG, RAW, SRC };
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struct Unknown_archive_type : Exception { };
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/**
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* Return Nth path element
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*
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* The first path element corresponds to n == 0.
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*/
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template <typename STRING>
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static STRING _path_element(Path const &path, unsigned n)
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{
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char const *s = path.string();
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/* skip 'n' path elements */
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for (; n > 0; n--) {
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/* search '/' */
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while (*s && *s != '/')
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s++;
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if (*s == 0)
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return STRING();
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/* skip '/' */
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s++;
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}
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/* find '/' marking the end of the path element */
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unsigned i = 0;
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while (s[i] != 0 && s[i] != '/')
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i++;
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return STRING(Cstring(s, i));
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}
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/**
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* Return archive user of depot-local path
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*/
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static User user(Path const &path) { return _path_element<User>(path, 0); }
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/**
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* Return archive type of depot-local path
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*
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* \throw Unknown_archive_type
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*/
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static Type type(Path const &path)
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{
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typedef String<8> Name;
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Name const name = _path_element<Name>(path, 1);
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if (name == "src") return SRC;
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if (name == "pkg") return PKG;
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if (name == "raw") return RAW;
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throw Unknown_archive_type();
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}
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/**
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* Return true if 'path' refers to an index file
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*/
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static bool index(Path const &path)
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{
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return _path_element<Name>(path, 1) == "index";
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}
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static Name name (Path const &path) { return _path_element<Name>(path, 2); }
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static Version version (Path const &path) { return _path_element<Version>(path, 3); }
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static Version index_version(Path const &path) { return _path_element<Version>(path, 2); }
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/**
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* Return name of compressed file to download for the given depot path
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*
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* Archives are shipped as tar.xz files whereas index files are shipped
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* as xz-compressed files.
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*/
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static Archive::Path download_file_path(Archive::Path path)
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{
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return Archive::index(path) ? Archive::Path(path, ".xz")
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: Archive::Path(path, ".tar.xz");
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}
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};
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#endif /* _INCLUDE__DEPOT__ARCHIVE_H_ */
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