GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/ring_buffer.cc
Date: 2026-01-11 02:35:46
Exec Total Coverage
Lines: 59 59 100.0%
Branches: 12 14 85.7%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 */
4
5 #include "ring_buffer.h"
6
7 #include <algorithm>
8 #include <cassert>
9 #include <cstdlib>
10 #include <cstring>
11
12 #include "util/smalloc.h"
13
14 const RingBuffer::ObjectHandle_t RingBuffer::kInvalidObjectHandle = size_t(-1);
15
16
17 78 RingBuffer::RingBuffer(size_t total_size)
18 78 : total_size_(total_size)
19 78 , free_space_(total_size)
20 78 , front_(0)
21 78 , back_(0)
22 78 , buffer_(reinterpret_cast<unsigned char *>(sxmmap(total_size_))) {
23
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 78 assert(total_size_ >= sizeof(size_t));
24 78 }
25
26
27 78 RingBuffer::~RingBuffer() { sxunmap(buffer_, total_size_); }
28
29
30 2080 void RingBuffer::Put(const void *data, size_t size) {
31 2080 const size_t size_head = std::min(size, total_size_ - front_);
32
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 2080 if (size_head > 0)
33 2079 memcpy(buffer_ + front_, data, size_head);
34
35
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 2080 if (size_head < size) {
36 339 const size_t size_tail = size - size_head;
37 339 memcpy(buffer_, reinterpret_cast<const unsigned char *>(data) + size_head,
38 size_tail);
39 }
40
41 2080 front_ = (front_ + size) % total_size_;
42 2080 free_space_ -= size;
43 2080 }
44
45
46 103870 void RingBuffer::Get(size_t from, size_t size, void *to) const {
47 103870 const size_t size_head = std::min(size, total_size_ - from);
48
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 103870 if (size_head > 0)
49 99016 memcpy(to, buffer_ + from, size_head);
50
51
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 103870 if (size_head < size) {
52 8719 const size_t size_tail = size - size_head;
53 8719 memcpy(reinterpret_cast<unsigned char *>(to) + size_head, buffer_,
54 size_tail);
55 }
56 103870 }
57
58
59 1998 void RingBuffer::Shrink(size_t by) {
60 1998 back_ = (back_ + by) % total_size_;
61 1998 free_space_ += by;
62 1998 }
63
64
65 3034 size_t RingBuffer::GetObjectSize(ObjectHandle_t handle) const {
66 size_t size_tag;
67 3034 Get(handle, sizeof(size_tag), &size_tag);
68
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 3034 assert(size_tag <= total_size_);
69 3034 return size_tag;
70 }
71
72
73 1041 RingBuffer::ObjectHandle_t RingBuffer::PushFront(const void *obj, size_t size) {
74 1041 size_t size_tag = size;
75 1041 size += sizeof(size_tag);
76
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 1041 if (size > free_space_) {
77 1 return kInvalidObjectHandle;
78 }
79
80 1040 const ObjectHandle_t result = front_;
81
82 1040 Put(&size_tag, sizeof(size_tag));
83 1040 Put(obj, size_tag);
84
85 1040 return result;
86 }
87
88
89 999 RingBuffer::ObjectHandle_t RingBuffer::RemoveBack() {
90 999 const ObjectHandle_t result = back_;
91
92 999 const size_t size_tag = GetObjectSize(result);
93 999 Shrink(sizeof(size_tag));
94 999 Shrink(size_tag);
95
96 999 return result;
97 }
98
99
100 998 void RingBuffer::CopyObject(ObjectHandle_t handle, void *to) const {
101 998 const size_t size_tag = GetObjectSize(handle);
102 998 const ObjectHandle_t object = (handle + sizeof(size_tag)) % total_size_;
103 998 Get(object, size_tag, to);
104 998 }
105
106
107 99838 void RingBuffer::CopySlice(ObjectHandle_t handle, size_t size, size_t offset,
108 void *to) const {
109 99838 const ObjectHandle_t begin = (handle + sizeof(size_t) + offset) % total_size_;
110 99838 Get(begin, size, to);
111 99838 }
112