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[x264-launcher/x264-launcher.git] / src / checksum.cpp
1 ///////////////////////////////////////////////////////////////////////////////
2 // Simple x264 Launcher
3 // Copyright (C) 2004-2014 LoRd_MuldeR <MuldeR2@GMX.de>
4 //
5 // This program is free software; you can redistribute it and/or modify
6 // it under the terms of the GNU General Public License as published by
7 // the Free Software Foundation; either version 2 of the License, or
8 // (at your option) any later version.
9 //
10 // This program is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 // GNU General Public License for more details.
14 //
15 // You should have received a copy of the GNU General Public License along
16 // with this program; if not, write to the Free Software Foundation, Inc.,
17 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 //
19 // http://www.gnu.org/licenses/gpl-2.0.txt
20 ///////////////////////////////////////////////////////////////////////////////
21
22 /*
23    BLAKE2 reference source code package - reference C implementations
24
25    Written in 2012 by Samuel Neves <sneves@dei.uc.pt>
26
27    To the extent possible under law, the author(s) have dedicated all copyright
28    and related and neighboring rights to this software to the public domain
29    worldwide. This software is distributed without any warranty.
30
31    You should have received a copy of the CC0 Public Domain Dedication along with
32    this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
33 */
34
35 #include "checksum.h"
36 #include "3rd_party/blake2.h"
37
38 #include <malloc.h>
39 #include <string.h>
40 #include <stdexcept>
41
42 static const size_t HASH_SIZE = 64;
43
44 class QBlake2ChecksumContext
45 {
46         friend QBlake2Checksum;
47
48         QBlake2ChecksumContext(void)
49         {
50                 if(!(state = (blake2b_state*) _aligned_malloc(sizeof(blake2b_state), 64)))
51                 {
52                         throw std::runtime_error("Aligend malloc has failed!");
53                 }
54                 memset(state, 0, sizeof(blake2b_state));
55         }
56
57         ~QBlake2ChecksumContext(void)
58         {
59                 memset(state, 0, sizeof(blake2b_state));
60                 _aligned_free(state);
61         }
62
63 private:
64         blake2b_state *state;
65 };
66
67 QBlake2Checksum::QBlake2Checksum(const char* key)
68 :
69         m_hash(HASH_SIZE, '\0'),
70         m_context(new QBlake2ChecksumContext()),
71         m_finalized(false)
72 {
73         if(key && key[0])
74         {
75                 blake2b_init_key(m_context->state, HASH_SIZE, key, strlen(key));
76         }
77         else
78         {
79                 blake2b_init(m_context->state, HASH_SIZE);
80         }
81 }
82
83 QBlake2Checksum::~QBlake2Checksum(void)
84 {
85         delete m_context;
86 }
87
88 void QBlake2Checksum::update(const QByteArray &data)
89 {
90         if(m_finalized)
91         {
92                 throw std::runtime_error("BLAKE2 was already finalized!");
93         }
94
95         if(data.size() > 0)
96         {
97                 if(blake2b_update(m_context->state, (const uint8_t*) data.constData(), data.size()) != 0)
98                 {
99                         throw std::runtime_error("BLAKE2 internal error!");
100                 }
101         }
102 }
103
104 void QBlake2Checksum::update(QFile &file)
105 {
106         bool okay = false;
107         
108         for(;;)
109         {
110                 QByteArray data = file.read(16384);
111                 if(data.size() > 0)
112                 {
113                         okay = true;
114                         update(data);
115                         continue;
116                 }
117                 break;
118         }
119
120         if(!okay)
121         {
122                 qWarning("[QBlake2Checksum] Could not ready any data from file!");
123         }
124 }
125
126 QByteArray QBlake2Checksum::finalize(const bool bAsHex)
127 {
128         if(!m_finalized)
129         {
130                 if(blake2b_final(m_context->state, (uint8_t*) m_hash.data(), m_hash.size()) != 0)
131                 {
132                         throw std::runtime_error("BLAKE2 internal error!");
133                 }
134
135                 m_finalized = true;
136         }
137
138         return bAsHex ? m_hash.toHex() : m_hash;
139 }