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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(unsigned int unit_size) : | |
34 | sample_count_(0), | |
35 | capacity_(0), | |
36 | unit_size_(unit_size) | |
37 | { | |
38 | lock_guard<recursive_mutex> lock(mutex_); | |
39 | assert(unit_size_ > 0); | |
40 | } | |
41 | ||
42 | Snapshot::~Snapshot() | |
43 | { | |
44 | lock_guard<recursive_mutex> lock(mutex_); | |
45 | } | |
46 | ||
47 | uint64_t Snapshot::get_sample_count() const | |
48 | { | |
49 | lock_guard<recursive_mutex> lock(mutex_); | |
50 | return sample_count_; | |
51 | } | |
52 | ||
53 | unsigned int Snapshot::unit_size() const | |
54 | { | |
55 | return unit_size_; | |
56 | } | |
57 | ||
58 | void Snapshot::set_capacity(const uint64_t new_capacity) | |
59 | { | |
60 | lock_guard<recursive_mutex> lock(mutex_); | |
61 | ||
62 | assert(capacity_ >= sample_count_); | |
63 | if (new_capacity > capacity_) { | |
64 | capacity_ = new_capacity; | |
65 | data_.resize((new_capacity * unit_size_) + sizeof(uint64_t)); | |
66 | } | |
67 | } | |
68 | ||
69 | uint64_t Snapshot::capacity() const | |
70 | { | |
71 | lock_guard<recursive_mutex> lock(mutex_); | |
72 | return data_.size(); | |
73 | } | |
74 | ||
75 | void Snapshot::append_data(void *data, uint64_t samples) | |
76 | { | |
77 | lock_guard<recursive_mutex> lock(mutex_); | |
78 | ||
79 | assert(capacity_ >= sample_count_); | |
80 | ||
81 | // Ensure there's enough capacity to copy. | |
82 | const uint64_t free_space = capacity_ - sample_count_; | |
83 | if (free_space < samples) { | |
84 | set_capacity(sample_count_ + samples); | |
85 | } | |
86 | ||
87 | memcpy((uint8_t*)data_.data() + sample_count_ * unit_size_, | |
88 | data, samples * unit_size_); | |
89 | sample_count_ += samples; | |
90 | } | |
91 | ||
92 | } // namespace data | |
93 | } // namespace pv |