Hinnant date library added

ext/CMakeLists.txt

@@ -12,7 +12,8 @@ set(SOURCE_HEADERS
 
 set(SOURCE_FILES
         format.cc
-        dateparser.cpp)
+        dateparser.cpp
+        date/tz.cpp)
 
 # make static library called libmyxrm
 # that we are going to link to

ext/date/chrono_io.h

@@ -0,0 +1,668 @@
+#ifndef CHRONO_IO_H
+#define CHRONO_IO_H
+
+// The MIT License (MIT)
+//
+// Copyright (c) 2016 Howard Hinnant
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+// Our apologies.  When the previous paragraph was written, lowercase had not yet
+// been invented (that woud involve another several millennia of evolution).
+// We did not mean to shout.
+
+#include <chrono>
+#include <cstddef>
+#include <cstdint>
+#include <iosfwd>
+#include <ratio>
+#include <string>
+#include <type_traits>
+
+namespace date
+{
+
+namespace detail
+{
+
+#if __cplusplus >= 201402
+
+template <class CharT, std::size_t N>
+class string_literal
+{
+    CharT p_[N];
+
+public:
+    using const_iterator = const CharT*;
+
+    string_literal(string_literal const&) = default;
+    string_literal& operator=(string_literal const&) = delete;
+
+    template <std::size_t N1 = 2,
+              class = std::enable_if_t<N1 == N>>
+    constexpr string_literal(CharT c) noexcept
+        : p_{c}
+    {
+    }
+
+    constexpr string_literal(const CharT(&a)[N]) noexcept
+        : p_{}
+    {
+        for (std::size_t i = 0; i < N; ++i)
+            p_[i] = a[i];
+    }
+
+    template <class U = CharT, class = std::enable_if_t<1 < sizeof(U)>>
+    constexpr string_literal(const char(&a)[N]) noexcept
+        : p_{}
+    {
+        for (std::size_t i = 0; i < N; ++i)
+            p_[i] = a[i];
+    }
+
+    template <class CharT2, class = std::enable_if_t<!std::is_same<CharT2, CharT>{}>>
+    constexpr string_literal(string_literal<CharT2, N> const& a) noexcept
+        : p_{}
+    {
+        for (std::size_t i = 0; i < N; ++i)
+            p_[i] = a[i];
+    }
+
+    template <std::size_t N1, std::size_t N2,
+              class = std::enable_if_t<N1 + N2 - 1 == N>>
+    constexpr string_literal(const string_literal<CharT, N1>& x,
+                             const string_literal<CharT, N2>& y) noexcept
+        : p_{}
+    {
+        std::size_t i = 0;
+        for (; i < N1-1; ++i)
+            p_[i] = x[i];
+        for (std::size_t j = 0; j < N2; ++j, ++i)
+            p_[i] = y[j];
+    }
+
+    constexpr const CharT* data() const noexcept {return p_;}
+    constexpr std::size_t size() const noexcept {return N-1;}
+
+    constexpr const_iterator begin() const noexcept {return p_;}
+    constexpr const_iterator end()   const noexcept {return p_ + N-1;}
+
+    constexpr CharT const& operator[](std::size_t n) const noexcept
+    {
+        return p_[n];
+    }
+
+    template <class Traits>
+    friend
+    std::basic_ostream<CharT, Traits>&
+    operator<<(std::basic_ostream<CharT, Traits>& os, const string_literal& s)
+    {
+        return os << s.p_;
+    }
+};
+
+template <class CharT1, class CharT2, std::size_t N1, std::size_t N2>
+constexpr
+inline
+string_literal<std::conditional_t<sizeof(CharT2) <= sizeof(CharT1), CharT1, CharT2>,
+               N1 + N2 - 1>
+operator+(const string_literal<CharT1, N1>& x, const string_literal<CharT2, N2>& y) noexcept
+{
+    using CharT = std::conditional_t<sizeof(CharT2) <= sizeof(CharT1), CharT1, CharT2>;
+    return string_literal<CharT, N1 + N2 - 1>{string_literal<CharT, N1>{x},
+                                              string_literal<CharT, N2>{y}};
+}
+
+template <class CharT, std::size_t N>
+constexpr
+inline
+string_literal<CharT, N>
+msl(const CharT(&a)[N]) noexcept
+{
+    return string_literal<CharT, N>{a};
+}
+
+template <class CharT,
+          class = std::enable_if_t<std::is_same<CharT, char>{} ||
+                                   std::is_same<CharT, wchar_t>{} ||
+                                   std::is_same<CharT, char16_t>{} ||
+                                   std::is_same<CharT, char32_t>{}>>
+constexpr
+inline
+string_literal<CharT, 2>
+msl(CharT c) noexcept
+{
+    return string_literal<CharT, 2>{c};
+}
+
+constexpr
+std::size_t
+to_string_len(std::intmax_t i)
+{
+    std::size_t r = 0;
+    do
+    {
+        i /= 10;
+        ++r;
+    } while (i > 0);
+    return r;
+}
+
+template <std::intmax_t N>
+constexpr
+inline
+std::enable_if_t
+<
+    N < 10,
+    string_literal<char, to_string_len(N)+1>
+>
+msl() noexcept
+{
+    return msl(char(N % 10 + '0'));
+}
+
+template <std::intmax_t N>
+constexpr
+inline
+std::enable_if_t
+<
+    10 <= N,
+    string_literal<char, to_string_len(N)+1>
+>
+msl() noexcept
+{
+    return msl<N/10>() + msl(char(N % 10 + '0'));
+}
+
+template <class CharT, std::intmax_t N, std::intmax_t D>
+constexpr
+inline
+std::enable_if_t
+<
+    std::ratio<N, D>::type::den != 1,
+    string_literal<CharT, to_string_len(std::ratio<N, D>::type::num) +
+                          to_string_len(std::ratio<N, D>::type::den) + 4>
+>
+msl(std::ratio<N, D>) noexcept
+{
+    using R = typename std::ratio<N, D>::type;
+    return msl(CharT{'['}) + msl<R::num>() + msl(CharT{'/'}) +
+                             msl<R::den>() + msl(CharT{']'});
+}
+
+template <class CharT, std::intmax_t N, std::intmax_t D>
+constexpr
+inline
+std::enable_if_t
+<
+    std::ratio<N, D>::type::den == 1,
+    string_literal<CharT, to_string_len(std::ratio<N, D>::type::num) + 3>
+>
+msl(std::ratio<N, D>) noexcept
+{
+    using R = typename std::ratio<N, D>::type;
+    return msl(CharT{'['}) + msl<R::num>() + msl(CharT{']'});
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::atto) noexcept
+{
+    return msl(CharT{'a'});
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::femto) noexcept
+{
+    return msl(CharT{'f'});
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::pico) noexcept
+{
+    return msl(CharT{'p'});
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::nano) noexcept
+{
+    return msl(CharT{'n'});
+}
+
+template <class CharT>
+constexpr
+inline
+std::enable_if_t
+<
+    std::is_same<CharT, char>{},
+    string_literal<char, 3>
+>
+msl(std::micro) noexcept
+{
+    return string_literal<char, 3>{"\xC2\xB5"};
+}
+
+template <class CharT>
+constexpr
+inline
+std::enable_if_t
+<
+    !std::is_same<CharT, char>{},
+    string_literal<CharT, 2>
+>
+msl(std::micro) noexcept
+{
+    return string_literal<CharT, 2>{CharT{static_cast<unsigned char>('\xB5')}};
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::milli) noexcept
+{
+    return msl(CharT{'m'});
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::centi) noexcept
+{
+    return msl(CharT{'c'});
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::deci) noexcept
+{
+    return msl(CharT{'d'});
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::deca) noexcept
+{
+    return string_literal<CharT, 3>{"da"};
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::hecto) noexcept
+{
+    return msl(CharT{'h'});
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::kilo) noexcept
+{
+    return msl(CharT{'k'});
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::mega) noexcept
+{
+    return msl(CharT{'M'});
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::giga) noexcept
+{
+    return msl(CharT{'G'});
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::tera) noexcept
+{
+    return msl(CharT{'T'});
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::peta) noexcept
+{
+    return msl(CharT{'P'});
+}
+
+template <class CharT>
+constexpr
+inline
+auto
+msl(std::exa) noexcept
+{
+    return msl(CharT{'E'});
+}
+
+template <class CharT, class Period>
+constexpr
+auto
+get_units(Period p)
+{
+    return msl<CharT>(p) + string_literal<CharT, 2>{"s"};
+}
+
+template <class CharT>
+constexpr
+auto
+get_units(std::ratio<1>)
+{
+    return string_literal<CharT, 2>{"s"};
+}
+
+template <class CharT>
+constexpr
+auto
+get_units(std::ratio<60>)
+{
+    return string_literal<CharT, 4>{"min"};
+}
+
+template <class CharT>
+constexpr
+auto
+get_units(std::ratio<3600>)
+{
+    return string_literal<CharT, 2>{"h"};
+}
+
+#else  //  __cplusplus < 201402
+
+inline
+std::string
+to_string(std::uint64_t x)
+{
+    return std::to_string(x);
+}
+
+template <class CharT>
+std::basic_string<CharT>
+to_string(std::uint64_t x)
+{
+    auto y = std::to_string(x);
+    return std::basic_string<CharT>(y.begin(), y.end());
+}
+
+template <class CharT, std::intmax_t N, std::intmax_t D>
+constexpr
+inline
+typename std::enable_if
+<
+    std::ratio<N, D>::type::den != 1,
+    std::basic_string<CharT>
+>::type
+msl(std::ratio<N, D>) noexcept
+{
+    using R = typename std::ratio<N, D>::type;
+    return std::basic_string<CharT>(1, '[') + to_string<CharT>(R::num) + CharT{'/'} +
+                                              to_string<CharT>(R::den) + CharT{']'};
+}
+
+template <class CharT, std::intmax_t N, std::intmax_t D>
+constexpr
+inline
+typename std::enable_if
+<
+    std::ratio<N, D>::type::den == 1,
+    std::basic_string<CharT>
+>::type
+msl(std::ratio<N, D>) noexcept
+{
+    using R = typename std::ratio<N, D>::type;
+    return std::basic_string<CharT>(1, '[') + to_string<CharT>(R::num) + CharT{']'};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::atto) noexcept
+{
+    return {'a'};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::femto) noexcept
+{
+    return {'f'};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::pico) noexcept
+{
+    return {'p'};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::nano) noexcept
+{
+    return {'n'};
+}
+
+template <class CharT>
+constexpr
+inline
+typename std::enable_if
+<
+    std::is_same<CharT, char>::value,
+    std::string
+>::type
+msl(std::micro) noexcept
+{
+    return "\xC2\xB5";
+}
+
+template <class CharT>
+constexpr
+inline
+typename std::enable_if
+<
+    !std::is_same<CharT, char>::value,
+    std::basic_string<CharT>
+>::type
+msl(std::micro) noexcept
+{
+    return {CharT(static_cast<unsigned char>('\xB5'))};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::milli) noexcept
+{
+    return {'m'};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::centi) noexcept
+{
+    return {'c'};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::deci) noexcept
+{
+    return {'d'};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::deca) noexcept
+{
+    return {'d', 'a'};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::hecto) noexcept
+{
+    return {'h'};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::kilo) noexcept
+{
+    return {'k'};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::mega) noexcept
+{
+    return {'M'};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::giga) noexcept
+{
+    return {'G'};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::tera) noexcept
+{
+    return {'T'};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::peta) noexcept
+{
+    return {'P'};
+}
+
+template <class CharT>
+constexpr
+inline
+std::basic_string<CharT>
+msl(std::exa) noexcept
+{
+    return {'E'};
+}
+
+template <class CharT, class Period>
+std::basic_string<CharT>
+get_units(Period p)
+{
+    return msl<CharT>(p) + CharT{'s'};
+}
+
+template <class CharT>
+std::basic_string<CharT>
+get_units(std::ratio<1>)
+{
+    return {'s'};
+}
+
+template <class CharT>
+std::basic_string<CharT>
+get_units(std::ratio<60>)
+{
+    return {'m', 'i', 'n'};
+}
+
+template <class CharT>
+std::basic_string<CharT>
+get_units(std::ratio<3600>)
+{
+    return {'h'};
+}
+
+#endif  //  __cplusplus >= 201402
+
+}  // namespace detail
+
+template <class CharT, class Traits, class Rep, class Period>
+inline
+std::basic_ostream<CharT, Traits>&
+operator<<(std::basic_ostream<CharT, Traits>& os,
+           const std::chrono::duration<Rep, Period>& d)
+{
+    using namespace std::chrono;
+    return os << d.count()
+              << detail::get_units<CharT>(typename Period::type{});
+}
+
+}  // namespace date
+
+#endif  // CHRONO_IO_H

ext/date/ios.h

@@ -0,0 +1,49 @@
+//
+//  ios.h
+//  DateTimeLib
+//
+// The MIT License (MIT)
+//
+// Copyright (c) 2016 Alexander Kormanovsky
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#ifndef ios_hpp
+#define ios_hpp
+
+#if __APPLE__
+# include <TargetConditionals.h>
+# if TARGET_OS_IPHONE
+#   include <string>
+
+    namespace date
+    {
+    namespace iOSUtils
+    {
+    
+    std::string get_tzdata_path();
+    
+    }  // namespace iOSUtils
+    }  // namespace date
+
+# endif  // TARGET_OS_IPHONE
+#else   // !__APPLE__
+# define TARGET_OS_IPHONE 0
+#endif  // !__APPLE__
+#endif // ios_hpp

ext/date/ios.mm

@@ -0,0 +1,405 @@
+//
+// The MIT License (MIT)
+//
+// Copyright (c) 2016 Alexander Kormanovsky
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+
+#include "ios.h"
+
+#if TARGET_OS_IPHONE
+
+#include <Foundation/Foundation.h>
+
+#include <iostream>
+#include <zlib.h>
+#include <sys/stat.h>
+
+#ifndef TAR_DEBUG
+#  define TAR_DEBUG 0
+#endif
+
+#define INTERNAL_DIR        "Library/tzdata"
+#define TARGZ_EXTENSION     "tar.gz"
+
+#define TAR_BLOCK_SIZE                  512
+#define TAR_TYPE_POSITION               156
+#define TAR_NAME_POSITION               0
+#define TAR_NAME_SIZE                   100
+#define TAR_SIZE_POSITION               124
+#define TAR_SIZE_SIZE                   12
+
+namespace date
+{
+namespace iOSUtils
+{
+
+struct TarInfo
+{
+    char objType;
+    std::string objName;
+    int64_t realContentSize; // writable size without padding zeroes
+    int64_t blocksContentSize; // adjusted size to 512 bytes blocks
+    bool success;
+};
+
+char* convertCFStringRefPathToCStringPath(CFStringRef ref);
+bool extractTzdata(CFURLRef homeUrl, CFURLRef archiveUrl, std::string destPath);
+TarInfo getTarObjectInfo(CFReadStreamRef readStream, int64_t location);
+std::string getTarObject(CFReadStreamRef readStream, int64_t size);
+bool writeFile(CFURLRef tzdataUrl, std::string fileName, std::string data,
+               int64_t realContentSize);
+
+std::string
+date::iOSUtils::get_tzdata_path()
+{
+    CFURLRef ref = CFCopyHomeDirectoryURL();
+    CFStringRef homePath = CFURLCopyPath(CFCopyHomeDirectoryURL());
+    std::string tzdata_path(std::string(convertCFStringRefPathToCStringPath(homePath)) +
+                            INTERNAL_DIR);
+
+    if (access(tzdata_path.c_str(), F_OK) == 0)
+    {
+#if TAR_DEBUG
+        printf("tzdata exists\n");
+#endif
+        return tzdata_path;
+    }
+
+    CFBundleRef mainBundle = CFBundleGetMainBundle();
+    CFArrayRef paths = CFBundleCopyResourceURLsOfType(mainBundle, CFSTR(TARGZ_EXTENSION),
+                                                      NULL);
+
+    if (CFArrayGetCount(paths) != 0)
+    {
+        // get archive path, assume there is no other tar.gz in bundle
+        CFURLRef archiveUrl = static_cast<CFURLRef>(CFArrayGetValueAtIndex(paths, 0));
+        CFStringRef archiveName= CFURLCopyPath(archiveUrl);
+        archiveUrl = CFBundleCopyResourceURL(mainBundle, archiveName, NULL, NULL);
+        
+        extractTzdata(CFCopyHomeDirectoryURL(), archiveUrl, tzdata_path);
+    }
+
+    return tzdata_path;
+}
+        
+char*
+convertCFStringRefPathToCStringPath(CFStringRef ref)
+{
+    CFIndex bufferSize = CFStringGetMaximumSizeOfFileSystemRepresentation(ref);
+    char *buffer = new char[bufferSize];
+    CFStringGetFileSystemRepresentation(ref, buffer, bufferSize);
+    return buffer;
+}
+        
+bool extractTzdata(CFURLRef homeUrl, CFURLRef archiveUrl, std::string destPath)
+{
+    const char *TAR_TMP_PATH = "/tmp.tar";
+
+    // create Library path
+    CFStringRef libraryStr = CFStringCreateWithCString(NULL, "Library",
+                                                       CFStringGetSystemEncoding());
+    CFURLRef libraryUrl = CFURLCreateCopyAppendingPathComponent(kCFAllocatorDefault,
+                                                                homeUrl, libraryStr,
+                                                                false);
+
+    // create tzdata path
+    CFStringRef tzdataPathRef = CFStringCreateWithCString(NULL, INTERNAL_DIR,
+                                                          CFStringGetSystemEncoding());
+    CFURLRef tzdataPathUrl = CFURLCreateCopyAppendingPathComponent(NULL, homeUrl,
+                                                                   tzdataPathRef, false);
+
+    // create src archive path
+    CFStringRef archivePath = CFURLCopyPath(archiveUrl);
+    gzFile tarFile = gzopen(convertCFStringRefPathToCStringPath(archivePath), "rb");
+
+    // create tar unpacking path
+    CFStringRef tarName = CFStringCreateWithCString(NULL, TAR_TMP_PATH,
+                                                    CFStringGetSystemEncoding());
+    CFURLRef tarUrl = CFURLCreateCopyAppendingPathComponent(NULL, libraryUrl, tarName,
+                                                            false);
+    const char *tarPath = convertCFStringRefPathToCStringPath(CFURLCopyPath(tarUrl));
+
+    // create tzdata directory
+    mkdir(destPath.c_str(), S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
+
+    // create stream
+    CFWriteStreamRef writeStream = CFWriteStreamCreateWithFile(NULL, tarUrl);
+    bool success = true;
+
+    if (!CFWriteStreamOpen(writeStream))
+    {
+        CFStreamError err = CFWriteStreamGetError(writeStream);
+
+        if (err.domain == kCFStreamErrorDomainPOSIX)
+        {
+            printf("kCFStreamErrorDomainPOSIX %i\n", err.error);
+        }
+        else if(err.domain == kCFStreamErrorDomainMacOSStatus)
+        {
+            printf("kCFStreamErrorDomainMacOSStatus %i\n", err.error);
+        }
+        
+        success = false;
+    }
+
+    if (!success)
+    {
+        remove(tarPath);
+        return false;
+    }
+
+    // ======= extract tar ========
+
+    unsigned int bufferLength = 1024 * 256;  // 256Kb
+    void *buffer = malloc(bufferLength);
+
+    while (true)
+    {
+        int readBytes = gzread(tarFile, buffer, bufferLength);
+
+        if (readBytes > 0)
+        {
+            CFIndex writtenBytes = CFWriteStreamWrite(writeStream, (unsigned char*)buffer,
+                                                      readBytes);
+            
+            if (writtenBytes < 0)
+            {
+                CFStreamError err = CFWriteStreamGetError(writeStream);
+                printf("write stream error %i\n", err.error);
+                success = false;
+                break;
+            }
+        }
+        else if (readBytes == 0)
+        {
+            break;
+        }
+        else if  (readBytes == -1)
+        {
+            printf("decompression failed\n");
+            success = false;
+            break;
+        }
+        else
+        {
+            printf("unexpected zlib state\n");
+            success = false;
+            break;
+        }
+    }
+
+    CFWriteStreamClose(writeStream);
+    CFRelease(writeStream);
+    free(buffer);
+    gzclose(tarFile);
+
+    if (!success)
+    {
+        remove(tarPath);
+        return false;
+    }
+
+    // ======== extract files =========
+
+    uint64_t location = 0; // Position in the file
+
+    // get file size
+    struct stat stat_buf;
+    int res = stat(tarPath, &stat_buf);
+    if (res != 0)
+    {
+        printf("error file size\n");
+        remove(tarPath);
+        return false;
+    }
+    int64_t tarSize = stat_buf.st_size;
+
+    // create read stream
+    CFReadStreamRef readStream = CFReadStreamCreateWithFile(kCFAllocatorDefault, tarUrl);
+
+    if (!CFReadStreamOpen(readStream))
+    {
+        CFStreamError err = CFReadStreamGetError(readStream);
+        
+        if (err.domain == kCFStreamErrorDomainPOSIX)
+        {
+            printf("kCFStreamErrorDomainPOSIX %i", err.error);
+        }
+        else if(err.domain == kCFStreamErrorDomainMacOSStatus)
+        {
+            printf("kCFStreamErrorDomainMacOSStatus %i", err.error);
+        }
+        
+        success = false;
+    }
+
+    if (!success)
+    {
+        CFRelease(readStream);
+        remove(tarPath);
+        return false;
+    }
+
+    int count = 0;
+    long size = 0;
+
+    // process files
+    while (location < tarSize)
+    {
+        TarInfo info = getTarObjectInfo(readStream, location);
+
+        if (!info.success || info.realContentSize == 0)
+        {
+            break; // something wrong or all files are read
+        }
+
+        switch (info.objType)
+        {
+            case '0':   // file
+            case '\0':  //
+            {
+                std::string obj = getTarObject(readStream, info.blocksContentSize);
+#if TAR_DEBUG
+                size += info.realContentSize;
+                printf("#%i %s file size %lld written total %ld from %lld\n", ++count,
+                       info.objName.c_str(), info.realContentSize, size, tarSize);
+#endif
+                writeFile(tzdataPathUrl, info.objName, obj, info.realContentSize);
+                location += info.blocksContentSize;
+
+                break;
+            }
+        }
+    }
+
+    CFReadStreamClose(readStream);
+    CFRelease(readStream);
+
+    remove(tarPath);
+
+    return true;
+}
+        
+TarInfo
+getTarObjectInfo(CFReadStreamRef readStream, int64_t location)
+{
+    int64_t length = TAR_BLOCK_SIZE;
+    uint8_t buffer[length];
+
+    char type;
+    char name[TAR_NAME_SIZE + 1];
+    char sizeBuf[TAR_SIZE_SIZE + 1];
+    CFIndex bytesRead;
+
+    bool avail = CFReadStreamHasBytesAvailable(readStream);
+
+    bytesRead = CFReadStreamRead(readStream, buffer, length);
+
+    if (bytesRead < 0)
+    {
+        CFStreamError err = CFReadStreamGetError(readStream);
+        printf("error reading tar object info %i", err.error);
+        return {false};
+    }
+
+    memcpy(&type, &buffer[TAR_TYPE_POSITION], 1);
+
+    memset(&name, '\0', TAR_NAME_SIZE + 1);
+    memcpy(&name, &buffer[TAR_NAME_POSITION], TAR_NAME_SIZE);
+
+    memset(&sizeBuf, '\0', TAR_SIZE_SIZE + 1);
+    memcpy(&sizeBuf, &buffer[TAR_SIZE_POSITION], TAR_SIZE_SIZE);
+    int64_t realSize = strtol(sizeBuf, NULL, 8);
+    int64_t blocksSize = realSize + (TAR_BLOCK_SIZE - (realSize % TAR_BLOCK_SIZE));
+
+    return {type, std::string(name), realSize, blocksSize, true};
+}
+
+std::string
+getTarObject(CFReadStreamRef readStream, int64_t size)
+{
+    uint8_t buffer[size];
+
+    CFIndex bytesRead = CFReadStreamRead(readStream, buffer, size);
+
+    if (bytesRead < 0)
+    {
+        CFStreamError err = CFReadStreamGetError(readStream);
+        printf("error reading tar object info %i", err.error);
+    }
+
+    return std::string((char *)buffer);
+}
+
+bool
+writeFile(CFURLRef tzdataUrl, std::string fileName, std::string data,
+          int64_t realContentSize)
+{
+    // create stream
+    CFStringRef fileNameRef = CFStringCreateWithCString(NULL, fileName.c_str(),
+                                                        CFStringGetSystemEncoding());
+    CFURLRef url = CFURLCreateCopyAppendingPathComponent(NULL, tzdataUrl, fileNameRef,
+                                                         false);
+    CFWriteStreamRef writeStream = CFWriteStreamCreateWithFile(NULL, url);
+
+    // open stream
+    if (!CFWriteStreamOpen(writeStream))
+    {
+        CFStreamError err = CFWriteStreamGetError(writeStream);
+
+        if (err.domain == kCFStreamErrorDomainPOSIX)
+        {
+            printf("kCFStreamErrorDomainPOSIX %i\n", err.error);
+        }
+        else if(err.domain == kCFStreamErrorDomainMacOSStatus)
+        {
+            printf("kCFStreamErrorDomainMacOSStatus %i\n", err.error);
+        }
+
+        CFRelease(writeStream);
+        return false;
+    }
+
+    // trim empty space
+    uint8_t trimmedData[realContentSize + 1];
+    memset(&trimmedData, '\0', realContentSize);
+    memcpy(&trimmedData, data.c_str(), realContentSize);
+
+    // write
+    CFIndex writtenBytes = CFWriteStreamWrite(writeStream, trimmedData, realContentSize);
+
+    if (writtenBytes < 0)
+    {
+        CFStreamError err = CFWriteStreamGetError(writeStream);
+        printf("write stream error %i\n", err.error);
+    }
+
+    CFWriteStreamClose(writeStream);
+    CFRelease(writeStream);
+    writeStream = NULL;
+
+    return true;
+}
+
+}  // namespace iOSUtils
+}  // namespace date
+
+#endif  // TARGET_OS_IPHONE

ext/date/tz_private.h

@@ -0,0 +1,265 @@
+#ifndef TZ_PRIVATE_H
+#define TZ_PRIVATE_H
+
+// The MIT License (MIT)
+//
+// Copyright (c) 2015, 2016 Howard Hinnant
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+// Our apologies.  When the previous paragraph was written, lowercase had not yet
+// been invented (that woud involve another several millennia of evolution).
+// We did not mean to shout.
+
+#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
+#include "tz.h"
+#else
+#include "date.h"
+#include <vector>
+#endif
+
+namespace date
+{
+
+namespace detail
+{
+
+enum class tz {utc, local, standard};
+
+//forward declare to avoid warnings in gcc 6.2
+class MonthDayTime;
+std::istream& operator>>(std::istream& is, MonthDayTime& x);
+std::ostream& operator<<(std::ostream& os, const MonthDayTime& x);
+
+
+class MonthDayTime
+{
+private:
+    struct pair
+    {
+#if defined(_MSC_VER) && (_MSC_VER < 1900)
+        pair() : month_day_(date::jan / 1), weekday_(0U) {}
+
+        pair(const date::month_day& month_day, const date::weekday& weekday)
+            : month_day_(month_day), weekday_(weekday) {}
+#endif
+
+        date::month_day month_day_;
+        date::weekday   weekday_;
+    };
+
+    enum Type {month_day, month_last_dow, lteq, gteq};
+
+    Type                         type_{month_day};
+
+#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
+    union U
+#else
+    struct U
+#endif
+    {
+        date::month_day          month_day_;
+        date::month_weekday_last month_weekday_last_;
+        pair                     month_day_weekday_;
+
+#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
+        U() : month_day_{date::jan/1} {}
+#else
+        U() :
+            month_day_(date::jan/1),
+            month_weekday_last_(date::month(0U), date::weekday_last(date::weekday(0U)))
+        {}
+
+#endif // !defined(_MSC_VER) || (_MSC_VER >= 1900)
+
+        U& operator=(const date::month_day& x);
+        U& operator=(const date::month_weekday_last& x);
+        U& operator=(const pair& x);
+    } u;
+
+    std::chrono::hours           h_{0};
+    std::chrono::minutes         m_{0};
+    std::chrono::seconds         s_{0};
+    tz                           zone_{tz::local};
+
+public:
+    MonthDayTime() = default;
+    MonthDayTime(local_seconds tp, tz timezone);
+    MonthDayTime(const date::month_day& md, tz timezone);
+
+    date::day day() const;
+    date::month month() const;
+    tz zone() const {return zone_;}
+
+    void canonicalize(date::year y);
+
+    sys_seconds
+       to_sys(date::year y, std::chrono::seconds offset, std::chrono::seconds save) const;
+    sys_days to_sys_days(date::year y) const;
+
+    sys_seconds to_time_point(date::year y) const;
+    int compare(date::year y, const MonthDayTime& x, date::year yx,
+                std::chrono::seconds offset, std::chrono::minutes prev_save) const;
+
+    friend std::istream& operator>>(std::istream& is, MonthDayTime& x);
+    friend std::ostream& operator<<(std::ostream& os, const MonthDayTime& x);
+};
+
+// A Rule specifies one or more set of datetimes without using an offset.
+// Multiple dates are specified with multiple years.  The years in effect
+// go from starting_year_ to ending_year_, inclusive.  starting_year_ <=
+// ending_year_. save_ is ineffect for times from the specified time
+// onward, including the specified time. When the specified time is
+// local, it uses the save_ from the chronologically previous Rule, or if
+// there is none, 0.
+
+//forward declare to avoid warnings in gcc 6.2
+class Rule;
+bool operator==(const Rule& x, const Rule& y);
+bool operator<(const Rule& x, const Rule& y);
+bool operator==(const Rule& x, const date::year& y);
+bool operator<(const Rule& x, const date::year& y);
+bool operator==(const date::year& x, const Rule& y);
+bool operator<(const date::year& x, const Rule& y);
+bool operator==(const Rule& x, const std::string& y);
+bool operator<(const Rule& x, const std::string& y);
+bool operator==(const std::string& x, const Rule& y);
+bool operator<(const std::string& x, const Rule& y);
+std::ostream& operator<<(std::ostream& os, const Rule& r);
+
+class Rule
+{
+private:
+    std::string          name_;
+    date::year           starting_year_{0};
+    date::year           ending_year_{0};
+    MonthDayTime         starting_at_;
+    std::chrono::minutes save_{0};
+    std::string          abbrev_;
+
+public:
+    Rule() = default;
+    explicit Rule(const std::string& s);
+    Rule(const Rule& r, date::year starting_year, date::year ending_year);
+
+    const std::string& name() const {return name_;}
+    const std::string& abbrev() const {return abbrev_;}
+
+    const MonthDayTime&         mdt()           const {return starting_at_;}
+    const date::year&           starting_year() const {return starting_year_;}
+    const date::year&           ending_year()   const {return ending_year_;}
+    const std::chrono::minutes& save()          const {return save_;}
+
+    static void split_overlaps(std::vector<Rule>& rules);
+
+    friend bool operator==(const Rule& x, const Rule& y);
+    friend bool operator<(const Rule& x, const Rule& y);
+    friend bool operator==(const Rule& x, const date::year& y);
+    friend bool operator<(const Rule& x, const date::year& y);
+    friend bool operator==(const date::year& x, const Rule& y);
+    friend bool operator<(const date::year& x, const Rule& y);
+    friend bool operator==(const Rule& x, const std::string& y);
+    friend bool operator<(const Rule& x, const std::string& y);
+    friend bool operator==(const std::string& x, const Rule& y);
+    friend bool operator<(const std::string& x, const Rule& y);
+
+    friend std::ostream& operator<<(std::ostream& os, const Rule& r);
+
+private:
+    date::day day() const;
+    date::month month() const;
+    static void split_overlaps(std::vector<Rule>& rules, std::size_t i, std::size_t& e);
+    static bool overlaps(const Rule& x, const Rule& y);
+    static void split(std::vector<Rule>& rules, std::size_t i, std::size_t k,
+                      std::size_t& e);
+};
+
+inline bool operator!=(const Rule& x, const Rule& y) {return !(x == y);}
+inline bool operator> (const Rule& x, const Rule& y) {return   y < x;}
+inline bool operator<=(const Rule& x, const Rule& y) {return !(y < x);}
+inline bool operator>=(const Rule& x, const Rule& y) {return !(x < y);}
+
+inline bool operator!=(const Rule& x, const date::year& y) {return !(x == y);}
+inline bool operator> (const Rule& x, const date::year& y) {return   y < x;}
+inline bool operator<=(const Rule& x, const date::year& y) {return !(y < x);}
+inline bool operator>=(const Rule& x, const date::year& y) {return !(x < y);}
+
+inline bool operator!=(const date::year& x, const Rule& y) {return !(x == y);}
+inline bool operator> (const date::year& x, const Rule& y) {return   y < x;}
+inline bool operator<=(const date::year& x, const Rule& y) {return !(y < x);}
+inline bool operator>=(const date::year& x, const Rule& y) {return !(x < y);}
+
+inline bool operator!=(const Rule& x, const std::string& y) {return !(x == y);}
+inline bool operator> (const Rule& x, const std::string& y) {return   y < x;}
+inline bool operator<=(const Rule& x, const std::string& y) {return !(y < x);}
+inline bool operator>=(const Rule& x, const std::string& y) {return !(x < y);}
+
+inline bool operator!=(const std::string& x, const Rule& y) {return !(x == y);}
+inline bool operator> (const std::string& x, const Rule& y) {return   y < x;}
+inline bool operator<=(const std::string& x, const Rule& y) {return !(y < x);}
+inline bool operator>=(const std::string& x, const Rule& y) {return !(x < y);}
+
+struct zonelet
+{
+    enum tag {has_rule, has_save, is_empty};
+
+    std::chrono::seconds gmtoff_;
+    tag tag_ = has_rule;
+
+#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
+    union U
+#else
+    struct U
+#endif
+    {
+        std::string          rule_;
+        std::chrono::minutes save_;
+
+        ~U() {}
+        U() {}
+        U(const U&) {}
+        U& operator=(const U&) = delete;
+    } u;
+
+    std::string                        format_;
+    date::year                         until_year_{0};
+    MonthDayTime                       until_date_;
+    sys_seconds                        until_utc_;
+    local_seconds                      until_std_;
+    local_seconds                      until_loc_;
+    std::chrono::minutes               initial_save_{};
+    std::string                        initial_abbrev_;
+    std::pair<const Rule*, date::year> first_rule_{nullptr, date::year::min()};
+    std::pair<const Rule*, date::year> last_rule_{nullptr, date::year::max()};
+
+    ~zonelet();
+    zonelet();
+    zonelet(const zonelet& i);
+    zonelet& operator=(const zonelet&) = delete;
+};
+
+}  // namespace detail
+
+}  // namespace date
+
+#if defined(_MSC_VER) && (_MSC_VER < 1900)
+#include "tz.h"
+#endif
+
+#endif  // TZ_PRIVATE_H

src/tools.h

@@ -18,6 +18,7 @@
 
 #include "../ext/dateparser.h"
 #include "../ext/infix_iterator.h"
+#include "../ext/date/tz.h"
 
 #include <boost/lexical_cast.hpp>
 #include <boost/filesystem.hpp>