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;; This file is part of scheme-GNUnet, a partial Scheme port of GNUnet.
;; Adapted from an iteration of (gnu gnunet metadata)
;; Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010 GNUnet e.V.
;; Copyright (C) 2020 Maxime Devos <maxime.devos@student.kuleuven.be>
;;
;; GNUnet is free software: you can redistribute it and/or modify it
;; under the terms of the GNU Affero General Public License as published
;; by the Free Software Foundation, either version 3 of the License,
;; or (at your option) any later version.
;;
;; GNUnet 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
;; Affero General Public License for more details.
;;
;; You should have received a copy of the GNU Affero General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;
;; SPDX-License-Identifier: AGPL-3.0-or-later
;;
;; As a special exception to the GNU Affero General Public License,
;; the file may be relicensed under any license used for
;; most source code of GNUnet 0.13.1, or later versions, as published by
;; GNUnet e.V.
;; Scheme port author: Maxime Devos
;; Scheme module: (gnu gnunet metadata struct)
;; Brief: meta data structure definitions
(library (gnu gnunet metadata struct)
(export MetaDataHeader MetaDataEntry
MetaType MetaFormat)
(import (only (gnu gnunet utils netstruct)
structure/packed u32/big
sizeof wrap-reader-setter
offset)
(only (gnu extractor metaformats)
integer->meta-format meta-format->integer)
(only (gnu extractor metatypes)
integer->meta-type meta-type->integer)
(only (rnrs base) define-syntax assert =))
(define-syntax MetaDataHeader
(structure/packed
;; The version of the MD serialization. The highest bit is used to
;; indicate compression.
;;
;; Version 0 is traditional (pre-0.9) meta data (unsupported)
;; Version is 1 for a NULL pointer
;; Version 2 is for 0.9.x (and possibly higher)
;; Other version numbers are not yet defined.
("version" u32/big)
;; How many MD entries are there?
("entries" u32/big)
;; Number of bytes of meta data
("size" u32/big)))
;; This is followed by 'entries' values of type 'struct MetaDataEntry'
;; and then by 'entry' plugin names, mime-types and data blocks
;; as specified in those meta data entries.
(assert (= (sizeof MetaDataHeader ()) 12))
(define-syntax MetaType
(wrap-reader-setter u32/big integer->meta-type meta-type->integer))
(define-syntax MetaFormat
(wrap-reader-setter u32/big integer->meta-format meta-format->integer))
(assert (= (sizeof MetaType ()) 4))
(assert (= (sizeof MetaFormat ()) 4))
;; catch some old issues
(assert (= (offset MetaType ()) 0))
(assert (= (offset MetaFormat ()) 0))
(assert (= (offset MetaDataHeader ("version")) 0))
(assert (= (offset MetaDataHeader ("entries")) 4))
(assert (= (offset MetaDataHeader ("size")) 8))
(define-syntax MetaDataEntry
(structure/packed
;; Meta data type
(type MetaType)
;; Meta data format (UTF8, binary, ...)
(format MetaFormat)
;; Number of bytes in meta data.
(data-size u32/big)
;; Number of bytes in the plugin name including 0-terminator.
;; 0 for no plugin name.
(plugin-name-length u32/big)
;; Number of bytes in the mime type including 0-terminator.
;; 0 for NULL.
(mime-type-length u32/big)))
(assert (= (sizeof MetaDataEntry ()) 20)))
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