GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/util/file_backed_buffer.cc
Date: 2026-11-08 02:41:18
Exec Total Coverage
Lines: 101 110 91.8%
Branches: 52 78 66.7%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 */
4
5 #include "file_backed_buffer.h"
6
7 #include <cassert>
8 #include <cstdint>
9 #include <cstdio>
10 #include <cstdlib>
11 #include <cstring>
12 #include <string>
13 #include <unistd.h>
14
15 #include "util/exception.h"
16 #include "util/logging.h"
17 #include "util/posix.h"
18 #include "util/smalloc.h"
19
20 3895 FileBackedBuffer *FileBackedBuffer::Create(uint64_t in_memory_threshold,
21 const std::string &tmp_dir) {
22
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 3895 return new FileBackedBuffer(in_memory_threshold, tmp_dir);
23 }
24
25 3895 FileBackedBuffer::FileBackedBuffer(uint64_t in_memory_threshold,
26 3895 const std::string &tmp_dir)
27 3895 : in_memory_threshold_(in_memory_threshold)
28 3895 , tmp_dir_(tmp_dir)
29 3895 , state_(kWriteState)
30 3895 , mode_(kMemoryMode)
31 3895 , size_(0)
32 3895 , buf_(NULL)
33 3895 , pos_(0)
34 3895 , fp_(NULL)
35
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 3895 , file_path_("")
36 3895 , mmapped_(NULL) { }
37
38 7790 FileBackedBuffer::~FileBackedBuffer() {
39 3895 free(buf_);
40
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 3895 if (mode_ != kFileMode)
41 2323 return;
42
43
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 1572 if (state_ == kWriteState) {
44 ✗ const int retval = fclose(fp_);
45 ✗ if (retval != 0)
46 ✗ PANIC(kLogStderr, "could not close temporary file %s: error %d",
47 file_path_.c_str(), retval);
48 } else {
49 1572 mmapped_->Unmap();
50
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 1572 delete mmapped_;
51 }
52 1572 const int retval = unlink(file_path_.c_str());
53
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 1572 if (retval != 0)
54 ✗ PANIC(kLogStderr, "could not delete temporary file %s: error %d",
55 file_path_.c_str(), retval);
56
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 6218 }
57
58 1198185 void FileBackedBuffer::Append(const void *source, uint64_t len) {
59
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 1198185 assert(source != NULL);
60
61 // Cannot write after Commit()
62
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 1198185 assert(state_ == kWriteState);
63
64
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 1198185 if (len == 0)
65 27 return;
66
67 // check the size and eventually save to file
68
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 1198158 if (mode_ == kMemoryMode && pos_ + len > in_memory_threshold_) {
69 // changes mode_ to kFileMode
70 1572 SaveToFile();
71 }
72
73
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 1198158 if (mode_ == kMemoryMode) {
74
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 140652 if (buf_ == NULL) {
75
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 2643 assert(size_ == 0);
76
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 2643 assert(pos_ == 0);
77 2643 buf_ = reinterpret_cast<unsigned char *>(smalloc(len));
78 2643 size_ = len;
79
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 138009 } else if (size_ < pos_ + len) {
80 11742 const uint64_t newsize = (size_ * 2 < pos_ + len) ? (pos_ + len)
81 : (size_ * 2);
82 11742 buf_ = reinterpret_cast<unsigned char *>(srealloc(buf_, newsize));
83 11742 size_ = newsize;
84 }
85
86 140652 memcpy(buf_ + pos_, source, len);
87 140652 pos_ += len;
88 } else {
89
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 1057506 assert(fp_ != NULL);
90 1057506 const uint64_t bytes_written = fwrite(source, 1, len, fp_);
91
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 1057512 if (bytes_written != len) {
92 ✗ PANIC(kLogStderr,
93 "could not append to temporary file %s: length %lu, "
94 "actually written %lu, error %d",
95 file_path_.c_str(), len, bytes_written, ferror(fp_));
96 }
97 1057512 pos_ += len;
98 1057512 size_ += len;
99 }
100 }
101
102 3852 void FileBackedBuffer::Commit() {
103
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 3852 assert(state_ == kWriteState);
104
105
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 3852 if (mode_ == kFileMode) {
106 1572 const int retval = fclose(fp_);
107
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 1572 if (retval != 0)
108 ✗ PANIC(kLogStderr, "could not close file after writing finished: %s",
109 file_path_.c_str());
110 1572 fp_ = NULL;
111
112
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 1572 mmapped_ = new MemoryMappedFile(file_path_);
113
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 1572 if (!mmapped_->Map())
114 ✗ PANIC(kLogStderr, "could not memory-map file %s", file_path_.c_str());
115 } else {
116 // Trim memory chunk size to actual data size
117 2280 buf_ = reinterpret_cast<unsigned char *>(srealloc(buf_, pos_));
118 2280 size_ = pos_;
119 }
120
121 3852 pos_ = 0;
122 3852 state_ = kReadState;
123 3852 }
124
125 98070 int64_t FileBackedBuffer::Data(void **ptr, int64_t len, uint64_t pos) {
126
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 98070 assert(state_ == kReadState);
127
128 196140 const int64_t actual_len = (pos + len <= size_)
129
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 98070 ? len
130 1971 : static_cast<int64_t>(size_)
131 1971 - static_cast<int64_t>(pos);
132
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 98070 assert(actual_len >= 0);
133
134
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 98070 if (mode_ == kMemoryMode) {
135 3852 *ptr = buf_ + pos;
136 } else {
137 94218 *ptr = mmapped_->buffer() + pos;
138 }
139 98070 return actual_len;
140 }
141
142 94245 int64_t FileBackedBuffer::Read(void *ptr, int64_t len) {
143 94245 const int64_t bytes_read = ReadP(ptr, len, pos_);
144 94245 pos_ += bytes_read;
145 94245 return bytes_read;
146 }
147
148 94245 int64_t FileBackedBuffer::ReadP(void *ptr, int64_t len, uint64_t pos) {
149 void *source;
150
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 94245 const int64_t bytes_read = Data(&source, len, pos);
151 94245 memcpy(ptr, source, bytes_read);
152 94245 return bytes_read;
153 }
154
155 3648 void FileBackedBuffer::Rewind() {
156
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 3648 assert(state_ == kReadState);
157 3648 pos_ = 0;
158 3648 }
159
160 19206 uint64_t FileBackedBuffer::GetSize() const {
161
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 19206 if (state_ == kWriteState && mode_ == kMemoryMode)
162 84 return pos_;
163 19122 return size_;
164 }
165
166
167 1572 void FileBackedBuffer::SaveToFile() {
168
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 1572 assert(state_ == kWriteState);
169
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 1572 assert(mode_ == kMemoryMode);
170
171
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 1572 assert(fp_ == NULL);
172 1572 fp_ = CreateTempFile(tmp_dir_, 0644, "w", &file_path_);
173
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 1572 if (fp_ == NULL)
174 ✗ PANIC(kLogStderr, "could not create temporary file");
175
176 1572 const uint64_t bytes_written = fwrite(buf_, 1, pos_, fp_);
177
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 1572 if (bytes_written != pos_) {
178 ✗ PANIC(kLogStderr,
179 "could not write to temporary file %s: length %lu, "
180 "actually written %lu, error %d",
181 file_path_.c_str(), pos_, bytes_written, ferror(fp_));
182 }
183
184 1572 free(buf_);
185 1572 buf_ = NULL;
186 1572 size_ = pos_;
187 1572 mode_ = kFileMode;
188 1572 }
189