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1 | /* | |
2 | * This file is part of the PulseView project. | |
3 | * | |
4 | * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include "snapshot.h" | |
22 | ||
23 | #include <assert.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | ||
27 | using std::lock_guard; | |
28 | using std::recursive_mutex; | |
29 | ||
30 | namespace pv { | |
31 | namespace data { | |
32 | ||
33 | Snapshot::Snapshot(int unit_size) : | |
34 | _data(NULL), | |
35 | _sample_count(0), | |
36 | _capacity(0), | |
37 | _unit_size(unit_size) | |
38 | { | |
39 | lock_guard<recursive_mutex> lock(_mutex); | |
40 | assert(_unit_size > 0); | |
41 | } | |
42 | ||
43 | Snapshot::~Snapshot() | |
44 | { | |
45 | lock_guard<recursive_mutex> lock(_mutex); | |
46 | free(_data); | |
47 | } | |
48 | ||
49 | uint64_t Snapshot::get_sample_count() const | |
50 | { | |
51 | lock_guard<recursive_mutex> lock(_mutex); | |
52 | return _sample_count; | |
53 | } | |
54 | ||
55 | int Snapshot::unit_size() const | |
56 | { | |
57 | return _unit_size; | |
58 | } | |
59 | ||
60 | void Snapshot::set_capacity(const uint64_t new_capacity) | |
61 | { | |
62 | lock_guard<recursive_mutex> lock(_mutex); | |
63 | ||
64 | assert(_capacity >= _sample_count); | |
65 | if (new_capacity > _capacity) { | |
66 | _capacity = new_capacity; | |
67 | _data = realloc(_data, (new_capacity * _unit_size) + sizeof(uint64_t)); | |
68 | } | |
69 | } | |
70 | ||
71 | uint64_t Snapshot::capacity() const | |
72 | { | |
73 | lock_guard<recursive_mutex> lock(_mutex); | |
74 | return _capacity; | |
75 | } | |
76 | ||
77 | void Snapshot::append_data(void *data, uint64_t samples) | |
78 | { | |
79 | lock_guard<recursive_mutex> lock(_mutex); | |
80 | ||
81 | assert(_capacity >= _sample_count); | |
82 | ||
83 | // Ensure there's enough capacity to copy. | |
84 | const uint64_t free_space = _capacity - _sample_count; | |
85 | if (free_space < samples) { | |
86 | set_capacity(_sample_count + samples); | |
87 | } | |
88 | ||
89 | memcpy((uint8_t*)_data + _sample_count * _unit_size, | |
90 | data, samples * _unit_size); | |
91 | _sample_count += samples; | |
92 | } | |
93 | ||
94 | } // namespace data | |
95 | } // namespace pv |