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
|
//===-- FileSystem.cpp ------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/FileSystem.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MD5.h"
#include <algorithm>
#include <fstream>
#include <vector>
using namespace lldb;
using namespace lldb_private;
namespace {
bool CalcMD5(const FileSpec &file_spec, uint64_t offset, uint64_t length,
llvm::MD5::MD5Result &md5_result) {
llvm::MD5 md5_hash;
std::ifstream file(file_spec.GetPath(), std::ios::binary);
if (!file.is_open())
return false;
if (offset > 0)
file.seekg(offset, file.beg);
std::vector<char> read_buf(4096);
uint64_t total_read_bytes = 0;
while (!file.eof()) {
const uint64_t to_read =
(length > 0) ? std::min(static_cast<uint64_t>(read_buf.size()),
length - total_read_bytes)
: read_buf.size();
if (to_read == 0)
break;
file.read(&read_buf[0], to_read);
const auto read_bytes = file.gcount();
if (read_bytes == 0)
break;
md5_hash.update(llvm::StringRef(&read_buf[0], read_bytes));
total_read_bytes += read_bytes;
}
md5_hash.final(md5_result);
return true;
}
} // namespace
bool FileSystem::CalculateMD5(const FileSpec &file_spec, uint64_t &low,
uint64_t &high) {
return CalculateMD5(file_spec, 0, 0, low, high);
}
bool FileSystem::CalculateMD5(const FileSpec &file_spec, uint64_t offset,
uint64_t length, uint64_t &low, uint64_t &high) {
llvm::MD5::MD5Result md5_result;
if (!CalcMD5(file_spec, offset, length, md5_result))
return false;
const auto uint64_res = reinterpret_cast<const uint64_t *>(md5_result);
high = uint64_res[0];
low = uint64_res[1];
return true;
}
bool FileSystem::CalculateMD5AsString(const FileSpec &file_spec,
std::string &digest_str) {
return CalculateMD5AsString(file_spec, 0, 0, digest_str);
}
bool FileSystem::CalculateMD5AsString(const FileSpec &file_spec,
uint64_t offset, uint64_t length,
std::string &digest_str) {
llvm::MD5::MD5Result md5_result;
if (!CalcMD5(file_spec, offset, length, md5_result))
return false;
llvm::SmallString<32> result_str;
llvm::MD5::stringifyResult(md5_result, result_str);
digest_str = result_str.c_str();
return true;
}
llvm::sys::TimePoint<>
FileSystem::GetModificationTime(const FileSpec &file_spec) {
llvm::sys::fs::file_status status;
std::error_code ec = llvm::sys::fs::status(file_spec.GetPath(), status);
if (ec)
return llvm::sys::TimePoint<>();
return status.getLastModificationTime();
}
|
