forked from OSchip/llvm-project
93 lines
2.6 KiB
C++
93 lines
2.6 KiB
C++
//===-- 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/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;
|
|
}
|