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