1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
// Copyright 2017 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "filesystem_for_testing.h"
#include <cassert>
#include <climits>
#include <cstdio>
#include <cstring>
#include <utility>
namespace cpu_features {
FakeFile::FakeFile(int file_descriptor, const char* content)
: file_descriptor_(file_descriptor), content_(content) {}
FakeFile::~FakeFile() { assert(!opened_); }
void FakeFile::Open() {
assert(!opened_);
opened_ = true;
}
void FakeFile::Close() {
assert(opened_);
opened_ = false;
}
int FakeFile::Read(int fd, void* buf, size_t count) {
assert(count < INT_MAX);
assert(fd == file_descriptor_);
const size_t remainder = content_.size() - head_index_;
const size_t read = count > remainder ? remainder : count;
memcpy(buf, content_.data() + head_index_, read);
head_index_ += read;
assert(read < INT_MAX);
return (int)read;
}
void FakeFilesystem::Reset() { files_.clear(); }
FakeFile* FakeFilesystem::CreateFile(const std::string& filename,
const char* content) {
auto& file = files_[filename];
file =
std::unique_ptr<FakeFile>(new FakeFile(next_file_descriptor_++, content));
return file.get();
}
FakeFile* FakeFilesystem::FindFileOrNull(const std::string& filename) const {
const auto itr = files_.find(filename);
return itr == files_.end() ? nullptr : itr->second.get();
}
FakeFile* FakeFilesystem::FindFileOrDie(const int file_descriptor) const {
for (const auto& filename_file_pair : files_) {
FakeFile* const file_ptr = filename_file_pair.second.get();
if (file_ptr->GetFileDescriptor() == file_descriptor) {
return file_ptr;
}
}
assert(false);
return nullptr;
}
static FakeFilesystem* kFilesystem = new FakeFilesystem();
FakeFilesystem& GetEmptyFilesystem() {
kFilesystem->Reset();
return *kFilesystem;
}
extern "C" int CpuFeatures_OpenFile(const char* filename) {
auto* const file = kFilesystem->FindFileOrNull(filename);
if (file) {
file->Open();
return file->GetFileDescriptor();
}
return -1;
}
extern "C" void CpuFeatures_CloseFile(int file_descriptor) {
kFilesystem->FindFileOrDie(file_descriptor)->Close();
}
extern "C" int CpuFeatures_ReadFile(int file_descriptor, void* buffer,
size_t buffer_size) {
return kFilesystem->FindFileOrDie(file_descriptor)
->Read(file_descriptor, buffer, buffer_size);
}
} // namespace cpu_features
|
