blob: 9a58b555fcf3c36dbaf2f5d210348a10129b3555 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
# gzip-like LZSS compressor
# Copyright (C) 2018 Pacien TRAN-GIRARD
#
# This program 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.
#
# 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 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 <https://www.gnu.org/licenses/>.
import ../bitio/bitreader
import huffmantree
type HuffmanDecoder*[T: SomeUnsignedInt] = object
tree: HuffmanTreeNode[T]
proc decoder*[T](tree: HuffmanTreeNode[T]): HuffmanDecoder[T] =
HuffmanDecoder[T](tree: tree)
proc decode*[T](decoder: HuffmanDecoder[T], bitReader: BitReader): T =
proc walk(node: HuffmanTreeNode[T]): T =
case node.kind:
of branch:
case bitReader.readBool():
of false: walk(node.left)
of true: walk(node.right)
of leaf:
node.value
walk(decoder.tree)
|