From 3c475f5027e870b19b9227375121b3b860eafb93 Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Wed, 4 Jan 2023 20:22:36 +0100
Subject: Added os.cpp and base64.cpp

---
 Makefile   |  2 ++
 base64.cpp | 23 ++++++++++++++++++
 base64.h   | 12 ++++++++++
 os.cpp     | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 os.h       | 12 ++++++++++
 5 files changed, 127 insertions(+)
 create mode 100644 base64.cpp
 create mode 100644 base64.h
 create mode 100644 os.cpp
 create mode 100644 os.h

diff --git a/Makefile b/Makefile
index 9604093..18725c8 100644
--- a/Makefile
+++ b/Makefile
@@ -18,8 +18,10 @@ CXXFLAGS+=-fvisibility=hidden
 CXXFLAGS+=-fPIC
 
 PROGSRC=\
+    base64.cpp \
     file.cpp \
     mime.cpp \
+    os.cpp \
     stringutil.cpp \
     tempfile.cpp \
     url.cpp
diff --git a/base64.cpp b/base64.cpp
new file mode 100644
index 0000000..d72dc52
--- /dev/null
+++ b/base64.cpp
@@ -0,0 +1,23 @@
+#include "base64.h"
+
+#include <boost/archive/iterators/binary_from_base64.hpp>
+#include <boost/archive/iterators/base64_from_binary.hpp>
+#include <boost/archive/iterators/transform_width.hpp>
+#include <boost/algorithm/string.hpp>
+
+std::string Reichwein::Base64::decode64(const std::string &val)
+{
+ using namespace boost::archive::iterators;
+ using It = transform_width<binary_from_base64<std::string::const_iterator>, 8, 6>;
+ return boost::algorithm::trim_right_copy_if(std::string(It(std::begin(val)), It(std::end(val))), [](char c) {
+  return c == '\0';
+ });
+}
+
+std::string Reichwein::Base64::encode64(const std::string &val)
+{
+ using namespace boost::archive::iterators;
+ using It = base64_from_binary<transform_width<std::string::const_iterator, 6, 8>>;
+ auto tmp = std::string(It(std::begin(val)), It(std::end(val)));
+ return tmp.append((3 - val.size() % 3) % 3, '=');
+}
diff --git a/base64.h b/base64.h
new file mode 100644
index 0000000..87d6daf
--- /dev/null
+++ b/base64.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#include <string>
+
+#define EXPORT __attribute__((visibility("default")))
+
+namespace Reichwein::Base64 {
+
+EXPORT std::string decode64(const std::string &val);
+EXPORT std::string encode64(const std::string &val);
+
+} // namespace
diff --git a/os.cpp b/os.cpp
new file mode 100644
index 0000000..af58173
--- /dev/null
+++ b/os.cpp
@@ -0,0 +1,78 @@
+#include "os.h"
+
+#include <boost/algorithm/string/split.hpp>
+
+#include <unistd.h>
+
+#include <fstream>
+#include <vector>
+
+using namespace std::string_literals;
+
+namespace {
+
+ std::string to_string(uint32_t v, size_t size)
+ {
+  std::string result{std::to_string(v)};
+
+  return (size > result.size() ? std::string(size - result.size(), char('0')) : ""s) + result;
+ }
+
+ std::string to_time_string(uint32_t sec)
+ {
+  uint32_t days = sec / (24 * 3600);
+  uint32_t hours = (sec % (24 * 3600)) / 3600;
+  uint32_t minutes = (sec % 3600) / 60;
+  uint32_t seconds = (sec % 60);
+
+  return std::to_string(days) + " days, "s + to_string(hours, 2) + ":"s + to_string(minutes, 2) + ":"s + to_string(seconds, 2);
+ }
+
+ uint64_t uptime()
+ {
+  double uptime_seconds{};
+  if (std::ifstream("/proc/uptime", std::ios::in) >> uptime_seconds)
+  {
+   return static_cast<uint64_t>(uptime_seconds);
+  }
+
+  return 0;
+ }
+
+} // anonymous namespace
+
+std::string Reichwein::OS::uptime_host()
+{
+ return to_time_string(uptime());
+}
+
+std::string Reichwein::OS::uptime_process()
+{
+ std::string filepath{"/proc/self/stat"};
+ std::ifstream f(filepath, std::ios::in);
+ if (f.is_open()) {
+  std::string line;
+  std::getline(f, line);
+  std::vector<std::string> elements;
+  boost::algorithm::split(elements, line, [](char c){ return c == ' '; });
+  if (elements.size() < 22)
+   throw std::runtime_error("Bad contents of /proc/self/stat");
+
+  long jiffies_per_second {sysconf(_SC_CLK_TCK)};
+  if (jiffies_per_second == 0)
+   throw std::runtime_error("Jiffies per second is 0");
+
+  try {
+   unsigned long starttime { std::stoul(elements[21])};
+
+   unsigned long runtime = uptime() - starttime / jiffies_per_second;
+
+   return to_time_string(runtime);
+  } catch (const std::exception& ex) {
+   throw std::runtime_error("Bad value in /proc/self/stat: "s + ex.what());
+  }
+
+ } else
+  throw std::runtime_error("Reading /proc/self/stat");
+}
+
diff --git a/os.h b/os.h
new file mode 100644
index 0000000..fd88894
--- /dev/null
+++ b/os.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#include <string>
+
+#define EXPORT __attribute__((visibility("default")))
+
+namespace Reichwein::OS {
+
+EXPORT std::string uptime_host();
+EXPORT std::string uptime_process();
+
+} // namespace
-- 
cgit v1.2.3