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authorPiotr Szarmanski2022-10-24 10:50:11 +0200
committerPiotr Szarmanski2022-10-24 10:50:11 +0200
commitc4b44fb12108c0764d1fa4ef1c37f11a54379343 (patch)
treeb5bb4d586e7973537608b73a7def903667c33f42 /src/hash-backend.lisp
parent087b4ea280caa05e7213eb2b051782086c96efba (diff)
Add hash-backend and update README.
Diffstat (limited to 'src/hash-backend.lisp')
-rw-r--r--src/hash-backend.lisp51
1 files changed, 51 insertions, 0 deletions
diff --git a/src/hash-backend.lisp b/src/hash-backend.lisp
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+;; This file is part of eris-cl.
+;; Copyright (C) 2022 Piotr SzarmaƄski
+
+;; eris-cl is free software: you can redistribute it and/or modify it under the
+;; terms of the GNU Lesser General Public License as published by the Free
+;; Software Foundation, either version 3 of the License, or (at your option) any
+;; later version.
+
+;; eris-cl 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
+;; eris-cl. If not, see <https://www.gnu.org/licenses/>.
+
+(in-package :eris)
+
+(defclass hash-backend (encoding-backend decoding-backend)
+ ((table :type hash-table)))
+
+(defmethod shared-initialize :after ((hash-backend hash-backend) slot-names
+ &rest initargs
+ &key &allow-other-keys)
+
+ (declare (ignore initargs slot-names))
+ (let ((hash-table (make-hash-table :test #'equalp)))
+ (with-slots (table output-function fetch-function) hash-backend
+ (setf table hash-table
+ fetch-function (lambda (reference)
+ (declare (type octet-vector reference))
+ (copy-seq (gethash reference hash-table)))
+ output-function (lambda (block reference)
+ (declare (type octet-vector block reference))
+ (setf (gethash reference hash-table)
+ block))))))
+
+(defmethod fetch-read-capability (read-capability (backend hash-backend) &key &allow-other-keys)
+ (declare (type read-capability read-capability))
+ (with-slots (fetch-function) backend
+ (eris-decode read-capability fetch-function :cache-capacity nil)))
+
+(defmethod store-data (input (backend hash-backend) &key (secret null-secret) (block-size 1kib) &allow-other-keys)
+ (declare (type octet-vector secret))
+ (with-slots (output-function) backend
+ (eris-encode input
+ block-size
+ output-function
+ :hash-output nil
+ :secret secret)))
+
+