/*
Stuffit algorithm 13: LZSS and Huffman.
The code in this file is based on TheUnarchiver.
See README.md and docs/licenses/TheUnarchiver.txt for more information.
Copyright (C) 2019, Guillaume Gonnet
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 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see .
*/
#include "stuffit/methods/algorithm13.h"
#include
#include
namespace maconv {
namespace stuffit {
// First code lengths (1).
static const int kFirstCodeLengths_1[321] = {
4, 5, 7, 8, 8, 9, 9, 9, 9, 7, 9, 9, 9, 8, 9, 9, 9, 9, 9,
9, 9, 9, 9, 10, 9, 9, 10, 10, 9, 10, 9, 9, 5, 9, 9, 9, 9, 10,
9, 9, 9, 9, 9, 9, 9, 9, 7, 9, 9, 8, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9, 9, 9, 8, 9, 9, 8, 8, 9, 9, 9, 9, 9, 9,
9, 7, 8, 9, 7, 9, 9, 7, 7, 9, 9, 9, 9, 10, 9, 10, 10, 10, 9,
9, 9, 5, 9, 8, 7, 5, 9, 8, 8, 7, 9, 9, 8, 8, 5, 5, 7, 10,
5, 8, 5, 8, 9, 9, 9, 9, 9, 10, 9, 9, 10, 9, 9, 10, 10, 10, 10,
10, 10, 10, 9, 10, 10, 10, 10, 10, 10, 10, 9, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 9, 10, 10, 10, 10, 10, 10, 10, 9, 9, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 10, 10, 10,
10, 10, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 10, 10, 9, 10, 10, 10, 10, 10, 10,
10, 9, 10, 10, 10, 9, 10, 9, 5, 6, 5, 5, 8, 9, 9, 9, 9, 9, 9,
10, 10, 10, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 9, 10, 9, 9, 9, 10, 9, 10, 9, 10, 9, 10, 9,
10, 10, 10, 9, 10, 9, 10, 10, 9, 9, 9, 6, 9, 9, 10, 9, 5
};
// First code lengths (2).
static const int kFirstCodeLengths_2[321] = {
4, 7, 7, 8, 7, 8, 8, 8, 8, 7, 8, 7, 8, 7, 9, 8, 8, 8, 9,
9, 9, 9, 10, 10, 9, 10, 10, 10, 10, 10, 9, 9, 5, 9, 8, 9, 9, 11,
10, 9, 8, 9, 9, 9, 8, 9, 7, 8, 8, 8, 9, 9, 9, 9, 9, 10, 9,
9, 9, 10, 9, 9, 10, 9, 8, 8, 7, 7, 7, 8, 8, 9, 8, 8, 9, 9,
8, 8, 7, 8, 7, 10, 8, 7, 7, 9, 9, 9, 9, 10, 10, 11, 11, 11, 10,
9, 8, 6, 8, 7, 7, 5, 7, 7, 7, 6, 9, 8, 6, 7, 6, 6, 7, 9,
6, 6, 6, 7, 8, 8, 8, 8, 9, 10, 9, 10, 9, 9, 8, 9, 10, 10, 9,
10, 10, 9, 9, 10, 10, 10, 10, 10, 10, 10, 9, 10, 10, 11, 10, 10, 10, 10,
10, 10, 10, 11, 10, 11, 10, 10, 9, 11, 10, 10, 10, 10, 10, 10, 9, 9, 10,
11, 10, 11, 10, 11, 10, 12, 10, 11, 10, 12, 11, 12, 10, 12, 10, 11, 10, 11,
11, 11, 9, 10, 11, 11, 11, 12, 12, 10, 10, 10, 11, 11, 10, 11, 10, 10, 9,
11, 10, 11, 10, 11, 11, 11, 10, 11, 11, 12, 11, 11, 10, 10, 10, 11, 10, 10,
11, 11, 12, 10, 10, 11, 11, 12, 11, 11, 10, 11, 9, 12, 10, 11, 11, 11, 10,
11, 10, 11, 10, 11, 9, 10, 9, 7, 3, 5, 6, 6, 7, 7, 8, 8, 8, 9,
9, 9, 11, 10, 10, 10, 12, 13, 11, 12, 12, 11, 13, 12, 12, 11, 12, 12, 13,
12, 14, 13, 14, 13, 15, 13, 14, 15, 15, 14, 13, 15, 15, 14, 15, 14, 15, 15,
14, 15, 13, 13, 14, 15, 15, 14, 14, 16, 16, 15, 15, 15, 12, 15, 10
};
// First code lengths (3).
static const int kFirstCodeLengths_3[321] = {
6, 6, 6, 6, 6, 9, 8, 8, 4, 9, 8, 9, 8, 9, 9, 9, 8, 9, 9,
10, 8, 10, 10, 10, 9, 10, 10, 10, 9, 10, 10, 9, 9, 9, 8, 10, 9, 10,
9, 10, 9, 10, 9, 10, 9, 9, 8, 9, 8, 9, 9, 9, 10, 10, 10, 10, 9,
9, 9, 10, 9, 10, 9, 9, 7, 8, 8, 9, 8, 9, 9, 9, 8, 9, 9, 10,
9, 9, 8, 9, 8, 9, 8, 8, 8, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10,
9, 8, 8, 9, 8, 9, 7, 8, 8, 9, 8, 10, 10, 8, 9, 8, 8, 8, 10,
8, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 10, 9, 7, 9, 9, 10, 10,
10, 10, 10, 9, 10, 10, 10, 10, 10, 10, 9, 9, 10, 10, 10, 10, 10, 10, 10,
10, 9, 10, 10, 10, 10, 10, 10, 9, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 10, 10, 10,
10, 9, 8, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 10, 10, 10, 9,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 10, 10, 10,
10, 10, 10, 9, 10, 10, 10, 10, 10, 10, 9, 9, 9, 10, 10, 10, 10, 10, 10,
9, 9, 10, 9, 9, 8, 9, 8, 9, 4, 6, 6, 6, 7, 8, 8, 9, 9, 10,
10, 10, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 7, 10, 10, 10, 7, 10, 10, 7, 7, 7, 7, 7, 6, 7, 10, 7, 7, 10,
7, 7, 7, 6, 7, 6, 6, 7, 7, 6, 6, 9, 6, 9, 10, 6, 10
};
// First code lengths (4).
static const int kFirstCodeLengths_4[321] = {
2, 6, 6, 7, 7, 8, 7, 8, 7, 8, 8, 9, 8, 9, 9, 9, 8, 8, 9,
9, 9, 10, 10, 9, 8, 10, 9, 10, 9, 10, 9, 9, 6, 9, 8, 9, 9, 10,
9, 9, 9, 10, 9, 9, 9, 9, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 10, 10, 9, 7, 7, 8, 8, 8, 8, 9, 9, 7, 8, 9, 10,
8, 8, 7, 8, 8, 10, 8, 8, 8, 9, 8, 9, 9, 10, 9, 11, 10, 11, 9,
9, 8, 7, 9, 8, 8, 6, 8, 8, 8, 7, 10, 9, 7, 8, 7, 7, 8, 10,
7, 7, 7, 8, 9, 9, 9, 9, 10, 11, 9, 11, 10, 9, 7, 9, 10, 10, 10,
11, 11, 10, 10, 11, 10, 10, 10, 11, 11, 10, 9, 10, 10, 11, 10, 11, 10, 11,
10, 10, 10, 11, 10, 11, 10, 10, 9, 10, 10, 11, 10, 10, 10, 10, 9, 10, 10,
10, 10, 11, 10, 11, 10, 11, 10, 11, 11, 11, 10, 12, 10, 11, 10, 11, 10, 11,
11, 10, 8, 10, 10, 11, 10, 11, 11, 11, 10, 11, 10, 11, 10, 11, 11, 11, 9,
10, 11, 11, 10, 11, 11, 11, 10, 11, 11, 11, 10, 10, 10, 10, 10, 11, 10, 10,
11, 11, 10, 10, 9, 11, 10, 10, 11, 11, 10, 10, 10, 11, 10, 10, 10, 10, 10,
10, 9, 11, 10, 10, 8, 10, 8, 6, 5, 6, 6, 7, 7, 8, 8, 8, 9, 10,
11, 10, 10, 11, 11, 12, 12, 10, 11, 12, 12, 12, 12, 13, 13, 13, 13, 13, 12,
13, 13, 15, 14, 12, 14, 15, 16, 12, 12, 13, 15, 14, 16, 15, 17, 18, 15, 17,
16, 15, 15, 15, 15, 13, 13, 10, 14, 12, 13, 17, 17, 18, 10, 17, 4
};
// First code lengths (5).
static const int kFirstCodeLengths_5[321] = {
7, 9, 9, 9, 9, 9, 9, 9, 9, 8, 9, 9, 9, 7, 9, 9, 9, 9, 9,
9, 9, 9, 9, 10, 9, 10, 9, 10, 9, 10, 9, 9, 5, 9, 7, 9, 9, 9,
9, 9, 7, 7, 7, 9, 7, 7, 8, 7, 8, 8, 7, 7, 9, 9, 9, 9, 7,
7, 7, 9, 9, 9, 9, 9, 9, 7, 9, 7, 7, 7, 7, 9, 9, 7, 9, 9,
7, 7, 7, 7, 7, 9, 7, 8, 7, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 7, 8, 7, 7, 7, 8, 8, 6, 7, 9, 7, 7, 8, 7, 5, 6, 9,
5, 7, 5, 6, 7, 7, 9, 8, 9, 9, 9, 9, 9, 9, 9, 9, 10, 9, 10,
10, 10, 9, 9, 10, 10, 10, 10, 10, 10, 10, 9, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 9, 10, 10, 10, 9, 10, 10, 10, 9, 9, 10, 9, 9, 9, 9,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 10, 10, 10, 10, 10, 10, 10,
10, 10, 9, 10, 10, 10, 9, 10, 10, 10, 9, 9, 9, 10, 10, 10, 10, 10, 9,
10, 9, 10, 10, 9, 10, 10, 9, 10, 10, 10, 10, 10, 10, 10, 9, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 10, 10, 10, 10, 10, 10,
10, 9, 10, 9, 10, 9, 10, 10, 9, 5, 6, 8, 8, 7, 7, 7, 9, 9, 9,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 9, 10, 10, 5, 10, 8, 9, 8, 9
};
// First code lengths (global array).
static const int *kFirstCodeLengths[5] = {
kFirstCodeLengths_1, kFirstCodeLengths_2, kFirstCodeLengths_3,
kFirstCodeLengths_4, kFirstCodeLengths_5
};
// Second code lengths (1).
static const int kSecondCodeLengths_1[321] = {
4, 5, 6, 6, 7, 7, 6, 7, 7, 7, 6, 8, 7, 8, 8, 8, 8, 9, 6,
9, 8, 9, 8, 9, 9, 9, 8, 10, 5, 9, 7, 9, 6, 9, 8, 10, 9, 10,
8, 8, 9, 9, 7, 9, 8, 9, 8, 9, 8, 8, 6, 9, 9, 8, 8, 9, 9,
10, 8, 9, 9, 10, 8, 10, 8, 8, 8, 8, 8, 9, 7, 10, 6, 9, 9, 11,
7, 8, 8, 9, 8, 10, 7, 8, 6, 9, 10, 9, 9, 10, 8, 11, 9, 11, 9,
10, 9, 8, 9, 8, 8, 8, 8, 10, 9, 9, 10, 10, 8, 9, 8, 8, 8, 11,
9, 8, 8, 9, 9, 10, 8, 11, 10, 10, 8, 10, 9, 10, 8, 9, 9, 11, 9,
11, 9, 10, 10, 11, 10, 12, 9, 12, 10, 11, 10, 11, 9, 10, 10, 11, 10, 11,
10, 11, 10, 11, 10, 10, 10, 9, 9, 9, 8, 7, 6, 8, 11, 11, 9, 12, 10,
12, 9, 11, 11, 11, 10, 12, 11, 11, 10, 12, 10, 11, 10, 10, 10, 11, 10, 11,
11, 11, 9, 12, 10, 12, 11, 12, 10, 11, 10, 12, 11, 12, 11, 12, 11, 12, 10,
12, 11, 12, 11, 11, 10, 12, 10, 11, 10, 12, 10, 12, 10, 12, 10, 11, 11, 11,
10, 11, 11, 11, 10, 12, 11, 12, 10, 10, 11, 11, 9, 12, 11, 12, 10, 11, 10,
12, 10, 11, 10, 12, 10, 11, 10, 7, 5, 4, 6, 6, 7, 7, 7, 8, 8, 7,
7, 6, 8, 6, 7, 7, 9, 8, 9, 9, 10, 11, 11, 11, 12, 11, 10, 11, 12,
11, 12, 11, 12, 12, 12, 12, 11, 12, 12, 11, 12, 11, 12, 11, 13, 11, 12, 10,
13, 10, 14, 14, 13, 14, 15, 14, 16, 15, 15, 18, 18, 18, 9, 18, 8
};
// Second code lengths (2).
static const int kSecondCodeLengths_2[321] = {
5, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 7, 8, 7, 7, 7, 8, 8,
8, 8, 9, 8, 9, 8, 9, 9, 9, 7, 9, 8, 8, 6, 9, 8, 9, 8, 9,
8, 9, 8, 9, 8, 9, 8, 9, 8, 8, 8, 8, 8, 9, 8, 9, 8, 9, 9,
10, 8, 10, 8, 9, 9, 8, 8, 8, 7, 8, 8, 9, 8, 9, 7, 9, 8, 10,
8, 9, 8, 9, 8, 9, 8, 8, 8, 9, 9, 9, 9, 10, 9, 11, 9, 10, 9,
10, 8, 8, 8, 9, 8, 8, 8, 9, 9, 8, 9, 10, 8, 9, 8, 8, 8, 11,
8, 7, 8, 9, 9, 9, 9, 10, 9, 10, 9, 10, 9, 8, 8, 9, 9, 10, 9,
10, 9, 10, 8, 10, 9, 10, 9, 11, 10, 11, 9, 11, 10, 10, 10, 11, 9, 11,
9, 10, 9, 11, 9, 11, 10, 10, 9, 10, 9, 9, 8, 10, 9, 11, 9, 9, 9,
11, 10, 11, 9, 11, 9, 11, 9, 11, 10, 11, 10, 11, 10, 11, 9, 10, 10, 11,
10, 10, 8, 10, 9, 10, 10, 11, 9, 11, 9, 10, 10, 11, 9, 10, 10, 9, 9,
10, 9, 10, 9, 10, 9, 10, 9, 11, 9, 11, 10, 10, 9, 10, 9, 11, 9, 11,
9, 11, 9, 10, 9, 11, 9, 11, 9, 11, 9, 10, 8, 11, 9, 10, 9, 10, 9,
10, 8, 10, 8, 9, 8, 9, 8, 7, 4, 4, 5, 6, 6, 6, 7, 7, 7, 7,
8, 8, 8, 7, 8, 8, 9, 9, 10, 10, 10, 10, 10, 10, 11, 11, 10, 10, 12,
11, 11, 12, 12, 11, 12, 12, 11, 12, 12, 12, 12, 12, 12, 11, 12, 11, 13, 12,
13, 12, 13, 14, 14, 14, 15, 13, 14, 13, 14, 18, 18, 17, 7, 16, 9
};
// Second code lengths (3).
static const int kSecondCodeLengths_3[321] = {
5, 6, 6, 6, 6, 7, 7, 7, 6, 8, 7, 8, 7, 9, 8, 8, 7, 7, 8,
9, 9, 9, 9, 10, 8, 9, 9, 10, 8, 10, 9, 8, 6, 10, 8, 10, 8, 10,
9, 9, 9, 9, 9, 10, 9, 9, 8, 9, 8, 9, 8, 9, 9, 10, 9, 10, 9,
9, 8, 10, 9, 11, 10, 8, 8, 8, 8, 9, 7, 9, 9, 10, 8, 9, 8, 11,
9, 10, 9, 10, 8, 9, 9, 9, 9, 8, 9, 9, 10, 10, 10, 12, 10, 11, 10,
10, 8, 9, 9, 9, 8, 9, 8, 8, 10, 9, 10, 11, 8, 10, 9, 9, 8, 12,
8, 9, 9, 9, 9, 8, 9, 10, 9, 12, 10, 10, 10, 8, 7, 11, 10, 9, 10,
11, 9, 11, 7, 11, 10, 12, 10, 12, 10, 11, 9, 11, 9, 12, 10, 12, 10, 12,
10, 9, 11, 12, 10, 12, 10, 11, 9, 10, 9, 10, 9, 11, 11, 12, 9, 10, 8,
12, 11, 12, 9, 12, 10, 12, 10, 13, 10, 12, 10, 12, 10, 12, 10, 9, 10, 12,
10, 9, 8, 11, 10, 12, 10, 12, 10, 12, 10, 11, 10, 12, 8, 12, 10, 11, 10,
10, 10, 12, 9, 11, 10, 12, 10, 12, 11, 12, 10, 9, 10, 12, 9, 10, 10, 12,
10, 11, 10, 11, 10, 12, 8, 12, 9, 12, 8, 12, 8, 11, 10, 11, 10, 11, 9,
10, 8, 10, 9, 9, 8, 9, 8, 7, 4, 3, 5, 5, 6, 5, 6, 6, 7, 7,
8, 8, 8, 7, 7, 7, 9, 8, 9, 9, 11, 9, 11, 9, 8, 9, 9, 11, 12,
11, 12, 12, 13, 13, 12, 13, 14, 13, 14, 13, 14, 13, 13, 13, 12, 13, 13, 12,
13, 13, 14, 14, 13, 13, 14, 14, 14, 14, 15, 18, 17, 18, 8, 16, 10
};
// Second code lengths (4).
static const int kSecondCodeLengths_4[321] = {
4, 5, 6, 6, 6, 6, 7, 7, 6, 7, 7, 9, 6, 8, 8, 7, 7, 8, 8,
8, 6, 9, 8, 8, 7, 9, 8, 9, 8, 9, 8, 9, 6, 9, 8, 9, 8, 10,
9, 9, 8, 10, 8, 10, 8, 9, 8, 9, 8, 8, 7, 9, 9, 9, 9, 9, 8,
10, 9, 10, 9, 10, 9, 8, 7, 8, 9, 9, 8, 9, 9, 9, 7, 10, 9, 10,
9, 9, 8, 9, 8, 9, 8, 8, 8, 9, 9, 10, 9, 9, 8, 11, 9, 11, 10,
10, 8, 8, 10, 8, 8, 9, 9, 9, 10, 9, 10, 11, 9, 9, 9, 9, 8, 9,
8, 8, 8, 10, 10, 9, 9, 8, 10, 11, 10, 11, 11, 9, 8, 9, 10, 11, 9,
10, 11, 11, 9, 12, 10, 10, 10, 12, 11, 11, 9, 11, 11, 12, 9, 11, 9, 10,
10, 10, 10, 12, 9, 11, 10, 11, 9, 11, 11, 11, 10, 11, 11, 12, 9, 10, 10,
12, 11, 11, 10, 11, 9, 11, 10, 11, 10, 11, 9, 11, 11, 9, 8, 11, 10, 11,
11, 10, 7, 12, 11, 11, 11, 11, 11, 12, 10, 12, 11, 13, 11, 10, 12, 11, 10,
11, 10, 11, 10, 11, 11, 11, 10, 12, 11, 11, 10, 11, 10, 10, 10, 11, 10, 12,
11, 12, 10, 11, 9, 11, 10, 11, 10, 11, 10, 12, 9, 11, 11, 11, 9, 11, 10,
10, 9, 11, 10, 10, 9, 10, 9, 7, 4, 5, 5, 5, 6, 6, 7, 6, 8, 7,
8, 9, 9, 7, 8, 8, 10, 9, 10, 10, 12, 10, 11, 11, 11, 11, 10, 11, 12,
11, 11, 11, 11, 11, 13, 12, 11, 12, 13, 12, 12, 12, 13, 11, 9, 12, 13, 7,
13, 11, 13, 11, 10, 11, 13, 15, 15, 12, 14, 15, 15, 15, 6, 15, 5
};
// Second code lengths (5).
static const int kSecondCodeLengths_5[321] = {
8, 10, 11, 11, 11, 12, 11, 11, 12, 6, 11, 12, 10, 5, 12, 12, 12, 12, 12,
12, 12, 13, 13, 14, 13, 13, 12, 13, 12, 13, 12, 15, 4, 10, 7, 9, 11, 11,
10, 9, 6, 7, 8, 9, 6, 7, 6, 7, 8, 7, 7, 8, 8, 8, 8, 8, 8,
9, 8, 7, 10, 9, 10, 10, 11, 7, 8, 6, 7, 8, 8, 9, 8, 7, 10, 10,
8, 7, 8, 8, 7, 10, 7, 6, 7, 9, 9, 8, 11, 11, 11, 10, 11, 11, 11,
8, 11, 6, 7, 6, 6, 6, 6, 8, 7, 6, 10, 9, 6, 7, 6, 6, 7, 10,
6, 5, 6, 7, 7, 7, 10, 8, 11, 9, 13, 7, 14, 16, 12, 14, 14, 15, 15,
16, 16, 14, 15, 15, 15, 15, 15, 15, 15, 15, 14, 15, 13, 14, 14, 16, 15, 17,
14, 17, 15, 17, 12, 14, 13, 16, 12, 17, 13, 17, 14, 13, 13, 14, 14, 12, 13,
15, 15, 14, 15, 17, 14, 17, 15, 14, 15, 16, 12, 16, 15, 14, 15, 16, 15, 16,
17, 17, 15, 15, 17, 17, 13, 14, 15, 15, 13, 12, 16, 16, 17, 14, 15, 16, 15,
15, 13, 13, 15, 13, 16, 17, 15, 17, 17, 17, 16, 17, 14, 17, 14, 16, 15, 17,
15, 15, 14, 17, 15, 17, 15, 16, 15, 15, 16, 16, 14, 17, 17, 15, 15, 16, 15,
17, 15, 14, 16, 16, 16, 16, 16, 12, 4, 4, 5, 5, 6, 6, 6, 7, 7, 7,
8, 8, 8, 8, 9, 9, 9, 9, 9, 10, 10, 10, 11, 10, 11, 11, 11, 11, 11,
12, 12, 12, 13, 13, 12, 13, 12, 14, 14, 12, 13, 13, 13, 13, 14, 12, 13, 13,
14, 14, 14, 13, 14, 14, 15, 15, 13, 15, 13, 17, 17, 17, 9, 17, 7
};
// Second code lengths (global array).
static const int *kSecondCodeLengths[5] = {
kSecondCodeLengths_1, kSecondCodeLengths_2, kSecondCodeLengths_3,
kSecondCodeLengths_4, kSecondCodeLengths_5
};
// Offset code lengths (1).
static const int kOffsetCodeLengths_1[11] = {
5, 6, 3, 3, 3, 3, 3, 3, 3, 4, 6
};
// Offset code lengths (2).
static const int kOffsetCodeLengths_2[13] = {
5, 6, 4, 4, 3, 3, 3, 3, 3, 4, 4, 4, 6
};
// Offset code lengths (3).
static const int kOffsetCodeLengths_3[14] = {
6, 7, 4, 4, 3, 3, 3, 3, 3, 4, 4, 4, 5, 7
};
// Offset code lengths (4).
static const int kOffsetCodeLengths_4[11] = {
3, 6, 5, 4, 2, 3, 3, 3, 4, 4, 6
};
// Offset code lengths (5).
static const int kOffsetCodeLengths_5[11] = {
6, 7, 7, 6, 4, 3, 2, 2, 3, 3, 6
};
// Offset code lengths (global array).
static const int *kOffsetCodeLengths[5] = {
kOffsetCodeLengths_1, kOffsetCodeLengths_2, kOffsetCodeLengths_3,
kOffsetCodeLengths_4, kOffsetCodeLengths_5
};
// Offset code size.
static const int kOffsetCodeSize[5] = { 11, 13, 14, 11, 11 };
// Meta codes.
static const int kMetaCodes[37] = {
0x5D8, 0x058, 0x040, 0x0C0, 0x000, 0x078, 0x02B, 0x014, 0x00C, 0x01C, 0x01B,
0x00B, 0x010, 0x020, 0x038, 0x018, 0x0D8, 0xBD8, 0x180, 0x680, 0x380, 0xF80,
0x780, 0x480, 0x080, 0x280, 0x3D8, 0xFD8, 0x7D8, 0x9D8, 0x1D8, 0x004, 0x001,
0x002, 0x007, 0x003, 0x008
};
// Meta code lengths.
static const int kMetaCodeLengths[37] = {
11, 8, 8, 8, 8, 7, 6, 5, 5, 5, 5, 6, 5, 6, 7, 7, 9, 12, 10,
11, 11, 12, 12, 11, 11, 11, 12, 12, 12, 12, 12, 5, 2, 2, 3, 4, 5
};
// LZSS decoder constants.
constexpr int kLzssMatch = -1;
constexpr int kLzssEnd = -2;
// Intialize LZSS.
void Algorithm13Method::InitializeLZSS()
{
int val = *(input.data++);
int code = ((val & 0xFF) >> 4);
if (code == 0) {
HuffmanDecoder metacode;
metacode.Initialize();
for (int i = 0; i < 37; i++)
metacode.AddValueLF(i, kMetaCodes[i], kMetaCodeLengths[i]);
metacode.MakeTable(true);
ParseHuffmanCode(firstcode, 321, metacode);
if (val & 0x08) secondcode = firstcode;
else ParseHuffmanCode(secondcode, 321, metacode);
ParseHuffmanCode(offsetcode, (val & 0x07) + 10, metacode);
}
else if (code < 6) {
firstcode.Initialize(kFirstCodeLengths[code-1], 321, 32, true);
secondcode.Initialize(kSecondCodeLengths[code-1], 321, 32, true);
offsetcode.Initialize(kOffsetCodeLengths[code-1], kOffsetCodeSize[code-1], 32, true);
}
else {
throw ExtractException("Algo13: invalid compressed data [code]");
}
currcode = &firstcode;
firstcode.MakeTable(true);
secondcode.MakeTable(true);
offsetcode.MakeTable(true);
}
// Parse code of size.
void Algorithm13Method::ParseHuffmanCode(HuffmanDecoder &decoder, int numcodes,
HuffmanDecoder &metacode)
{
int length = 0;
int lengths[numcodes];
for (int i = 0; i < numcodes; i++) {
int val = metacode.NextSymbol(input);
switch(val) {
case 31: length = -1; break;
case 32: length++; break;
case 33: length--; break;
case 34:
if (input.ReadBit()) lengths[i++] = length;
break;
case 35:
val = input.ReadWord(3) + 2;
while (val--) lengths[i++] = length;
break;
case 36:
val = input.ReadWord(6) + 10;
while (val--) lengths[i++] = length;
break;
default: length = val+1; break;
}
lengths[i] = length;
}
decoder.Initialize(lengths, numcodes, 32, true);
}
// Get the next litteral or offset.
int Algorithm13Method::NextLiteralOrOffset(int &offset, int &length)
{
if (input.HasEnded())
throw ExtractException("Algo13: all data read but algo has not finished");
int val = currcode->NextSymbol(input);
if (val < 0x100) {
currcode = &firstcode;
return val;
}
else {
currcode = &secondcode;
if (val < 0x13E) length = val - 0x100 + 3;
else if (val == 0x13E) length = input.ReadWord(10) + 65;
else if (val == 0x13F) length = input.ReadWord(15) + 65;
else return kLzssEnd;
int bit_length = offsetcode.NextSymbol(input);
if (bit_length == 0) offset = 1;
else if (bit_length == 1) offset = 2;
else offset = (1 << (bit_length-1)) + input.ReadWord(bit_length-1) + 1;
return kLzssMatch;
}
}
// Constants.
constexpr int kWindowSize = 65536;
constexpr int kWindowMask = kWindowSize - 1;
// Initialize the algorithm.
void Algorithm13Method::Initialize()
{
ended = false;
input.Load(data, end - data);
window_buffer = std::make_unique(kWindowSize);
match_length = 0; match_offset = 0;
memset(window_buffer.get(), 0, kWindowSize);
InitializeLZSS();
}
// Read the next byte.
int32_t Algorithm13Method::ReadNextByte(uint32_t pos)
{
if (!match_length) {
int offset, length;
int val = NextLiteralOrOffset(offset, length);
if (val >= 0) {
window_buffer[pos & kWindowMask] = val;
return val;
} else if (val == kLzssEnd) {
ended = true;
return -1;
} else {
match_length = length;
match_offset = pos - offset;
}
}
match_length--;
uint8_t byte = window_buffer[match_offset++ & kWindowMask];
window_buffer[pos & kWindowMask] = byte;
return byte;
}
// Read the next bytes.
int32_t Algorithm13Method::ReadBytes(uint8_t *buffer, uint32_t length)
{
if (ended) return -1;
uint8_t *start = buffer;
uint8_t *end_capacity = buffer + length;
int32_t byte;
while (buffer != end_capacity && (byte = ReadNextByte(total_size + (buffer - start))) != -1)
*(buffer++) = byte;
return buffer - start;
}
} // namespace stuffit
} // namespace maconv