separate crypto_helper into header file, fix lots of stuff

include/xlnt/cell/cell.hpp

@@ -183,9 +183,20 @@ public:
     std::string hyperlink() const;
 
     /// <summary>
-    /// Adds a hyperlink to this cell pointing to the URI of the given value.
+    /// Adds a hyperlink to this cell pointing to the URL of the given value.
     /// </summary>
-    void hyperlink(const std::string &value);
+    void hyperlink(const std::string &url);
+
+    /// <summary>
+    /// Adds a hyperlink to this cell pointing to the URI of the given value and sets
+    /// the text value of the cell to the given parameter.
+    /// </summary>
+    void hyperlink(const std::string &url, const std::string &display);
+
+    /// <summary>
+    /// Adds an internal hyperlink to this cell pointing to the given cell.
+    /// </summary>
+    void hyperlink(xlnt::cell target);
 
     /// <summary>
     /// Returns true if this cell has a hyperlink set.

include/xlnt/workbook/workbook.hpp

@@ -450,20 +450,20 @@ public:
     /// Serializes the workbook into an XLSX file encrypted with the given password
     /// and loads the bytes into a file named filename.
     /// </summary>
-    void save(const std::string &filename, const std::string &password);
+    void save(const std::string &filename, const std::string &password) const;
 
 #ifdef _MSC_VER
     /// <summary>
     /// Serializes the workbook into an XLSX file and saves the data into a file
     /// named filename.
     /// </summary>
-    void save(const std::wstring &filename);
+    void save(const std::wstring &filename) const;
 
     /// <summary>
     /// Serializes the workbook into an XLSX file encrypted with the given password
     /// and loads the bytes into a file named filename.
     /// </summary>
-    void save(const std::wstring &filename, const std::string &password);
+    void save(const std::wstring &filename, const std::string &password) const;
 #endif
 
     /// <summary>
@@ -476,7 +476,7 @@ public:
     /// Serializes the workbook into an XLSX file encrypted with the given password
     /// and loads the bytes into a file named filename.
     /// </summary>
-    void save(const xlnt::path &filename, const std::string &password);
+    void save(const xlnt::path &filename, const std::string &password) const;
 
     /// <summary>
     /// Serializes the workbook into an XLSX file and saves the data into stream.
@@ -487,7 +487,7 @@ public:
     /// Serializes the workbook into an XLSX file encrypted with the given password
     /// and loads the bytes into the given stream.
     /// </summary>
-    void save(std::ostream &stream, const std::string &password);
+    void save(std::ostream &stream, const std::string &password) const;
 
     /// <summary>
     /// Interprets byte vector data as an XLSX file and sets the content of this

include/xlnt/worksheet/worksheet.hpp

@@ -742,6 +742,11 @@ private:
     /// </summary>
     void register_comments_in_manifest();
 
+    /// <summary>
+    /// Add the calcChain part to the workbook if it doesn't already exist.
+    /// </summary>
+    void register_calc_chain_in_manifest();
+
     /// <summary>
     /// Removes calcChain part from manifest if no formulae remain in workbook.
     /// </summary>

source/cell/cell.cpp

@@ -446,18 +446,24 @@ void cell::hyperlink(const std::string &hyperlink)
     }
 
     d_->hyperlink_ = hyperlink;
+}
 
-    if (data_type() == type::null)
+void cell::hyperlink(const std::string &url, const std::string &display)
-    {
+{
-        value(hyperlink);
+    hyperlink(url);
-    }
+    value(display);
+}
+
+void cell::hyperlink(xlnt::cell /*target*/)
+{
+    //todo: implement
 }
 
 void cell::formula(const std::string &formula)
 {
     if (formula.empty())
     {
-        throw invalid_parameter();
+        return clear_formula();
     }
 
     if (formula[0] == '=')
@@ -468,6 +474,8 @@ void cell::formula(const std::string &formula)
     {
         d_->formula_ = formula;
     }
+    
+    worksheet().register_calc_chain_in_manifest();
 }
 
 bool cell::has_formula() const

source/cell/tests/test_cell.hpp

@@ -140,7 +140,7 @@ public:
         auto cell = ws.cell(xlnt::cell_reference(1, 1));
 
         TS_ASSERT(!cell.has_formula());
-        TS_ASSERT_THROWS(cell.formula(""), xlnt::invalid_parameter);
+        TS_ASSERT_THROWS_NOTHING(cell.formula(""));
         TS_ASSERT(!cell.has_formula());
         cell.formula("=42");
         TS_ASSERT(cell.has_formula());

source/detail/workbook_impl.hpp

@@ -95,9 +95,9 @@ struct workbook_impl
     optional<theme> theme_;
     std::unordered_map<std::string, std::vector<std::uint8_t>> images_;
 
-    std::unordered_map<xlnt::core_property, variant, xlnt::scoped_enum_hash<xlnt::core_property>> core_properties_;
+    std::vector<std::pair<xlnt::core_property, variant>> core_properties_;
-    std::unordered_map<xlnt::extended_property, variant, xlnt::scoped_enum_hash<xlnt::extended_property>> extended_properties_;
+    std::vector<std::pair<xlnt::extended_property, variant>> extended_properties_;
-    std::unordered_map<std::string, variant> custom_properties_;
+    std::vector<std::pair<std::string, variant>> custom_properties_;
 
 	std::unordered_map<std::string, std::string> sheet_title_rel_id_map_;
 

source/detail/xlsx_crypto.hpp

@@ -0,0 +1,162 @@
+// Copyright (c) 2014-2017 Thomas Fussell
+//
+// 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, WRISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE
+//
+// @license: http://www.opensource.org/licenses/mit-license.php
+// @author: see AUTHORS file
+
+#include <array>
+
+#include <xlnt/utils/exceptions.hpp>
+#include <xlnt/workbook/workbook.hpp>
+#include <detail/constants.hpp>
+#include <detail/include_cryptopp.hpp>
+#include <detail/include_libstudxml.hpp>
+#include <detail/pole.hpp>
+#include <detail/vector_streambuf.hpp>
+#include <detail/xlsx_consumer.hpp>
+#include <detail/xlsx_producer.hpp>
+
+namespace xlnt {
+namespace detail {
+
+enum class hash_algorithm
+{
+    sha1,
+    sha256,
+    sha384,
+    sha512,
+    md5,
+    md4,
+    md2,
+    ripemd128,
+    ripemd160,
+    whirlpool
+};
+
+struct crypto_helper
+{
+    static const std::size_t segment_length;
+
+    enum class cipher_algorithm
+    {
+        aes,
+        rc2,
+        rc4,
+        des,
+        desx,
+        triple_des,
+        triple_des_112
+    };
+
+    enum class cipher_chaining
+    {
+        ecb, // electronic code book
+        cbc, // cipher block chaining
+        cfb // cipher feedback chaining
+    };
+
+    enum class cipher_direction
+    {
+        encryption,
+        decryption
+    };
+
+    static std::vector<std::uint8_t> aes(const std::vector<std::uint8_t> &key, const std::vector<std::uint8_t> &iv,
+        const std::vector<std::uint8_t> &source, cipher_chaining chaining, cipher_direction direction);
+
+    static std::vector<std::uint8_t> decode_base64(const std::string &encoded);
+
+    static std::string encode_base64(const std::vector<std::uint8_t> &decoded);
+
+    static std::vector<std::uint8_t> hash(hash_algorithm algorithm, const std::vector<std::uint8_t> &input);
+
+    static std::vector<std::uint8_t> file(POLE::Storage &storage, const std::string &name);
+
+    struct standard_encryption_info
+    {
+        const std::size_t spin_count = 50000;
+        std::size_t block_size;
+        std::size_t key_bits;
+        std::size_t key_bytes;
+        std::size_t hash_size;
+        cipher_algorithm cipher;
+        cipher_chaining chaining;
+        const hash_algorithm hash = hash_algorithm::sha1;
+        std::vector<std::uint8_t> salt_value;
+        std::vector<std::uint8_t> verifier_hash_input;
+        std::vector<std::uint8_t> verifier_hash_value;
+        std::vector<std::uint8_t> encrypted_key_value;
+    };
+
+    static std::vector<std::uint8_t> decrypt_xlsx_standard(const std::vector<std::uint8_t> &encryption_info,
+        const std::string &password, const std::vector<std::uint8_t> &encrypted_package);
+
+    struct agile_encryption_info
+    {
+        // key data
+        struct
+        {
+            std::size_t salt_size;
+            std::size_t block_size;
+            std::size_t key_bits;
+            std::size_t hash_size;
+            std::string cipher_algorithm;
+            std::string cipher_chaining;
+            std::string hash_algorithm;
+            std::vector<std::uint8_t> salt_value;
+        } key_data;
+
+        struct
+        {
+            std::vector<std::uint8_t> hmac_key;
+            std::vector<std::uint8_t> hmac_value;
+        } data_integrity;
+
+        struct
+        {
+            std::size_t spin_count;
+            std::size_t salt_size;
+            std::size_t block_size;
+            std::size_t key_bits;
+            std::size_t hash_size;
+            std::string cipher_algorithm;
+            std::string cipher_chaining;
+            hash_algorithm hash;
+            std::vector<std::uint8_t> salt_value;
+            std::vector<std::uint8_t> verifier_hash_input;
+            std::vector<std::uint8_t> verifier_hash_value;
+            std::vector<std::uint8_t> encrypted_key_value;
+        } key_encryptor;
+    };
+
+    static agile_encryption_info generate_agile_encryption_info(const std::string &password);
+
+    static std::vector<std::uint8_t> write_agile_encryption_info(const std::string &password);
+
+    static std::vector<std::uint8_t> decrypt_xlsx_agile(const std::vector<std::uint8_t> &encryption_info,
+        const std::string &password, const std::vector<std::uint8_t> &encrypted_package);
+
+    static std::vector<std::uint8_t> decrypt_xlsx(const std::vector<std::uint8_t> &bytes, const std::string &password);
+
+    static std::vector<std::uint8_t> encrypt_xlsx(const std::vector<std::uint8_t> &bytes, const std::string &password);
+};
+
+} // namespace detail
+} // namespace xlnt

source/detail/xlsx_producer.cpp

@@ -218,7 +218,7 @@ void xlsx_producer::write_property(const std::string &name, const variant &value
             write_start_element(constants::ns("vt"), "bool");
         }
 
-        write_characters(write_bool(value.get<bool>()));
+        write_characters(value.get<bool>() ? "true" : "false");
 
         if (custom)
         {
@@ -336,6 +336,7 @@ void xlsx_producer::write_core_properties(const relationship &/*rel*/)
         for (const auto &ns : core_property_namespace(prop))
         {
             if (namespaces.count(ns.first) > 0) continue;
+
             write_namespace(ns.first, ns.second);
             namespaces.emplace(ns);
         }

source/detail/zstream.cpp

@@ -432,7 +432,7 @@ protected:
 
     virtual int underflow()
     {
-        throw std::runtime_error("Attempt to read write only ostream");
+        throw xlnt::exception("Attempt to read write only ostream");
     }
 
     virtual int overflow(int c = EOF);
@@ -494,7 +494,7 @@ izstream::izstream(std::istream &stream)
 {
     if (!stream)
     {
-        throw std::runtime_error("ZIP: Invalid file handle");
+        throw xlnt::exception("Invalid file handle");
     }
 
     read_central_header();
@@ -522,15 +522,20 @@ bool izstream::read_central_header()
     }
 
     source_stream_.seekg(end_position - read_start);
-    std::vector<char> buf(static_cast<std::size_t>(read_start), '\0');
+    std::vector<std::uint8_t> buf(static_cast<std::size_t>(read_start), '\0');
 
     if (read_start <= 0)
     {
-        std::cerr << "ZIP: Invalid read buffer size" << std::endl;
+        throw xlnt::exception("file is empty");
-        return false;
     }
 
-    source_stream_.read(buf.data(), read_start);
+    source_stream_.read(reinterpret_cast<char *>(buf.data()), read_start);
+    
+    if (buf[0] == 0xd0 && buf[1] == 0xcf && buf[2] == 0x11 && buf[3] == 0xe0
+        && buf[4] == 0xa1 && buf[5] == 0xb1 && buf[6] == 0x1a && buf[7] == 0xe1)
+    {
+        throw xlnt::exception("encrypted xlsx, password required");
+    }
 
     auto found_header = false;
     std::size_t header_index = 0;
@@ -547,8 +552,7 @@ bool izstream::read_central_header()
 
     if (!found_header)
     {
-        std::cerr << "ZIP: Failed to find zip header" << std::endl;
+        throw xlnt::exception("failed to find zip header");
-        return false;
     }
 
     // seek to end of central header and read
@@ -560,8 +564,7 @@ bool izstream::read_central_header()
 
     if (disk_number1 != disk_number2 || disk_number1 != 0)
     {
-        std::cerr << "ZIP: multiple disk zip files are not supported" << std::endl;
+        throw xlnt::exception("multiple disk zip files are not supported");
-        return false;
     }
 
     auto num_files = read_int<std::uint16_t>(source_stream_); // one entry in center in this disk
@@ -569,8 +572,7 @@ bool izstream::read_central_header()
 
     if (num_files != num_files_this_disk)
     {
-        std::cerr << "ZIP: multi disk zip files are not supported" << std::endl;
+        throw xlnt::exception("multi disk zip files are not supported");
-        return false;
     }
 
     /*auto size_of_header = */ read_int<std::uint32_t>(source_stream_); // size of header
@@ -592,7 +594,7 @@ std::unique_ptr<std::streambuf> izstream::open(const path &filename) const
 {
     if (!has_file(filename))
     {
-        throw "not found";
+        throw xlnt::exception("file not found");
     }
 
     auto header = file_headers_.at(filename.string());

source/workbook/tests/test_produce_xlsx.hpp

@@ -134,7 +134,7 @@ public:
 		TS_ASSERT(!temp_buffer.empty());
 	}
 
-	void test_write_comments()
+	void test_write_comments_hyperlinks_formulae()
 	{
 		xlnt::workbook wb;
 		auto sheet1 = wb.active_sheet();
@@ -146,6 +146,15 @@ public:
 		sheet1.cell("A2").value("Sheet1!A2");
 		sheet1.cell("A2").comment("Sheet1 comment2", comment_font, "Microsoft Office User");
 
+        sheet1.cell("A4").hyperlink("https://microsoft.com", "hyperlink1");
+        sheet1.cell("A5").hyperlink("https://google.com");
+        sheet1.cell("A6").hyperlink(sheet1.cell("A1"));
+        sheet1.cell("A7").hyperlink("mailto:invalid@example.com?subject=important");
+
+        sheet1.cell("C1").formula("=CONCATENATE(C2,C3)");
+        sheet1.cell("C2").value("a");
+        sheet1.cell("C3").value("b");
+
 		auto sheet2 = wb.create_sheet();
 		sheet2.cell("A1").value("Sheet2!A1");
 		sheet2.cell("A2").comment("Sheet2 comment", comment_font, "Microsoft Office User");
@@ -153,6 +162,12 @@ public:
 		sheet2.cell("A2").value("Sheet2!A2");
 		sheet2.cell("A2").comment("Sheet2 comment2", comment_font, "Microsoft Office User");
 
+        sheet2.cell("A4").hyperlink("https://apple.com", "hyperlink2");
+
+        sheet2.cell("C1").formula("=C2*C3");
+        sheet2.cell("C2").value(2);
+        sheet2.cell("C3").value(3);
+
         const auto path = path_helper::data_directory("10_comments_hyperlinks_formulae.xlsx");
 		TS_ASSERT(workbook_matches_file(wb, path));
 	}

source/workbook/tests/test_round_trip.hpp

@@ -5,6 +5,7 @@
 #include <cxxtest/TestSuite.h>
 
 #include <detail/vector_streambuf.hpp>
+#include <detail/xlsx_crypto.hpp>
 #include <helpers/path_helper.hpp>
 #include <helpers/xml_helper.hpp>
 #include <xlnt/workbook/workbook.hpp>
@@ -16,27 +17,34 @@ public:
     /// Read file as an XLSX-formatted ZIP file in the filesystem to a workbook,
     /// write the workbook back to memory, then ensure that the contents of the two files are equivalent.
     /// </summary>
-	bool round_trip_matches_rw(const xlnt::path &original)
+	bool round_trip_matches_rw(const xlnt::path &source)
 	{
-        std::ifstream file_stream(original.string(), std::ios::binary);
+		xlnt::workbook source_workbook;
-        std::vector<std::uint8_t> original_data;
+        source_workbook.load(source);
 
-        {
+        std::vector<std::uint8_t> destination;
-            xlnt::detail::vector_ostreambuf file_data_buffer(original_data);
+        source_workbook.save(destination);
-            std::ostream file_data_stream(&file_data_buffer);
-            file_data_stream << file_stream.rdbuf();
-        }
 
-		xlnt::workbook original_workbook;
+        std::ifstream source_stream(source.string(), std::ios::binary);
-		original_workbook.load(original);
-        
-        std::vector<std::uint8_t> buffer;
-        original_workbook.save(buffer);
-        original_workbook.save("round_trip_out.xlsx");
 
-		return xml_helper::xlsx_archives_match(original_data, buffer);
+		return xml_helper::xlsx_archives_match(xlnt::detail::to_vector(source_stream), destination);
 	}
 
+	bool round_trip_matches_rw(const xlnt::path &source, const std::string &password)
+	{
+		xlnt::workbook source_workbook;
+        source_workbook.load(source, password);
+
+        std::vector<std::uint8_t> destination;
+        source_workbook.save(destination);
+
+        std::ifstream source_stream(source.string(), std::ios::binary);
+        const auto source_decrypted = xlnt::detail::crypto_helper::decrypt_xlsx(
+            xlnt::detail::to_vector(source_stream), password);
+
+		return xml_helper::xlsx_archives_match(source_decrypted, destination);
+    }
+
 	void test_round_trip_empty_excel_rw()
 	{
         const auto files = std::vector<std::string>
@@ -44,10 +52,6 @@ public:
             "2_minimal",
             "3_default",
             "4_every_style",
-            "5_encrypted_agile",
-            "6_encrypted_libre",
-            "7_encrypted_standard",
-            "8_encrypted_numbers",
             "10_comments_hyperlinks_formulae",
             "11_print_settings",
             "12_advanced_properties"
@@ -59,4 +63,22 @@ public:
             TS_ASSERT(round_trip_matches_rw(path));
         }
 	}
+
+	void test_round_trip_empty_excel_rw_encrypted()
+	{
+        const auto files = std::vector<std::string>
+        {
+            "5_encrypted_agile",
+            "6_encrypted_libre",
+            "7_encrypted_standard",
+            "8_encrypted_numbers"
+        };
+
+        for (const auto file : files)
+        {
+            auto path = path_helper::data_directory(file + ".xlsx");
+            TS_ASSERT(round_trip_matches_rw(path, file
+                == "7_encrypted_standard" ? "password" : "secret"));
+        }
+	}
 };

source/workbook/workbook.cpp

@@ -107,9 +107,9 @@ void open_stream(std::ofstream &stream, const std::string &path)
 #endif
 
 template<typename T>
-std::vector<typename T::key_type> keys(const T &container)
+std::vector<T> keys(const std::vector<std::pair<T, xlnt::variant>> &container)
 {
-    auto result = std::vector<typename T::key_type>();
+    auto result = std::vector<T>();
     auto iter = container.begin();
 
     while (iter != container.end())
@@ -120,6 +120,20 @@ std::vector<typename T::key_type> keys(const T &container)
     return result;
 }
 
+template<typename T>
+bool contains(const std::vector<std::pair<T, xlnt::variant>> &container, const T key)
+{
+    for (const auto &iter : container)
+    {
+        if (iter.first == key)
+        {
+            return true;
+        }
+    }
+
+    return false;
+}
+
 xlnt::path default_path(xlnt::relationship_type type, std::size_t index = 0)
 {
     using xlnt::path;
@@ -285,7 +299,7 @@ namespace xlnt {
 
 bool workbook::has_core_property(xlnt::core_property type) const
 {
-    return d_->core_properties_.count(type) > 0;
+    return ::contains(d_->core_properties_, type);
 }
 
 std::vector<xlnt::core_property> workbook::core_properties() const
@@ -295,18 +309,36 @@ std::vector<xlnt::core_property> workbook::core_properties() const
 
 variant workbook::core_property(xlnt::core_property type) const
 {
-    return d_->core_properties_.at(type);
+    for (auto iter : d_->core_properties_)
+    {
+        if (iter.first == type)
+        {
+            return iter.second;
+        }
+    }
+    
+    throw xlnt::exception("workbook doesn't have core property");
 }
 
 void workbook::core_property(xlnt::core_property type, const variant &value)
 {
     register_package_part(relationship_type::core_properties);
-    d_->core_properties_[type] = value;
+
+    for (auto &iter : d_->core_properties_)
+    {
+        if (iter.first == type)
+        {
+            iter.second = value;
+            return;
+        }
+    }
+    
+    d_->core_properties_.push_back({type, value});
 }
 
 bool workbook::has_extended_property(xlnt::extended_property type) const
 {
-    return d_->extended_properties_.count(type) > 0;
+    return ::contains(d_->extended_properties_, type);
 }
 
 std::vector<xlnt::extended_property> workbook::extended_properties() const
@@ -317,17 +349,35 @@ std::vector<xlnt::extended_property> workbook::extended_properties() const
 void workbook::extended_property(xlnt::extended_property type, const variant &value)
 {
     register_package_part(relationship_type::extended_properties);
-    d_->extended_properties_[type] = value;
+
+    for (auto &iter : d_->extended_properties_)
+    {
+        if (iter.first == type)
+        {
+            iter.second = value;
+            return;
+        }
+    }
+    
+    d_->extended_properties_.push_back({type, value});
 }
 
 variant workbook::extended_property(xlnt::extended_property type) const
 {
-    return d_->extended_properties_.at(type);
+    for (auto iter : d_->extended_properties_)
+    {
+        if (iter.first == type)
+        {
+            return iter.second;
+        }
+    }
+    
+    throw xlnt::exception("workbook doesn't have extended property");
 }
 
 bool workbook::has_custom_property(const std::string &property_name) const
 {
-    return d_->custom_properties_.count(property_name) > 0;
+    return ::contains(d_->custom_properties_, property_name);
 }
 
 std::vector<std::string> workbook::custom_properties() const
@@ -338,12 +388,30 @@ std::vector<std::string> workbook::custom_properties() const
 void workbook::custom_property(const std::string &property_name, const variant &value)
 {
     register_package_part(relationship_type::custom_properties);
-    d_->custom_properties_[property_name] = value;
+
+    for (auto &iter : d_->custom_properties_)
+    {
+        if (iter.first == property_name)
+        {
+            iter.second = value;
+            return;
+        }
+    }
+    
+    d_->custom_properties_.push_back({property_name, value});
 }
 
 variant workbook::custom_property(const std::string &property_name) const
 {
-    return d_->custom_properties_.at(property_name);
+    for (auto iter : d_->custom_properties_)
+    {
+        if (iter.first == property_name)
+        {
+            return iter.second;
+        }
+    }
+    
+    throw xlnt::exception("workbook doesn't have custom property");
 }
 
 workbook workbook::empty()
@@ -367,7 +435,9 @@ workbook workbook::empty()
 
     wb.extended_property(xlnt::extended_property::application, "Microsoft Macintosh Excel");
     wb.extended_property(xlnt::extended_property::doc_security, 0);
-    wb.extended_property(xlnt::extended_property::scale_crop, "false");
+    wb.extended_property(xlnt::extended_property::scale_crop, false);
+    wb.extended_property(xlnt::extended_property::heading_pairs, std::vector<variant>{variant("Worksheets"), variant(1)});
+    wb.extended_property(xlnt::extended_property::titles_of_parts, {"Sheet1"});
     wb.extended_property(xlnt::extended_property::company, "");
     wb.extended_property(xlnt::extended_property::links_up_to_date, false);
     wb.extended_property(xlnt::extended_property::shared_doc, false);
@@ -793,25 +863,6 @@ void workbook::load(const std::vector<std::uint8_t> &data)
 
 void workbook::load(const std::string &filename)
 {
-    if (filename.find_last_of(".") != std::string::npos) // check extension
-    {
-       std::string file_format = path(filename).extension();
-
-       if (file_format == "xls") {
-           throw xlnt::exception(" xlnt does not support the old .xls file format");
-       }
-       else if (file_format == "xlsb") {
-           throw xlnt::exception(" xlnt does not support the .xlsb file format");
-       }
-       else if (file_format != "xlsx") {
-           throw xlnt::exception(" xlnt does not support the ."+file_format+ " file format");
-       }
-    }
-    else
-    {
-        throw xlnt::exception("file has no extension .xlsx");
-    }
-
     return load(path(filename));
 }
 
@@ -830,25 +881,6 @@ void workbook::load(const path &filename)
 
 void workbook::load(const std::string &filename, const std::string &password)
 {
-        if (filename.find_last_of(".") != std::string::npos) // check extension
-    {
-       std::string file_format = path(filename).extension();
-
-       if (file_format == "xls") {
-           throw xlnt::exception(" xlnt does not support the old .xls file format");
-       }
-       else if (file_format == "xlsb") {
-           throw xlnt::exception(" xlnt does not support the .xlsb file format");
-       }
-       else if (file_format != "xlsx") {
-           throw xlnt::exception(" xlnt does not support the ."+file_format+ " file format");
-       }
-    }
-    else
-    {
-        throw xlnt::exception("file has no extension .xlsx");
-    }
-
     return load(path(filename), password);
 }
 
@@ -891,9 +923,21 @@ void workbook::save(std::vector<std::uint8_t> &data) const
     save(data_stream);
 }
 
+void workbook::save(std::vector<std::uint8_t> &data, const std::string &password) const
+{
+    xlnt::detail::vector_ostreambuf data_buffer(data);
+    std::ostream data_stream(&data_buffer);
+    save(data_stream, password);
+}
+
 void workbook::save(const std::string &filename) const
 {
-    return save(path(filename));
+    save(path(filename));
+}
+
+void workbook::save(const std::string &filename, const std::string &password) const
+{
+    save(path(filename), password);
 }
 
 void workbook::save(const path &filename) const
@@ -903,27 +947,34 @@ void workbook::save(const path &filename) const
     save(file_stream);
 }
 
+void workbook::save(const path &filename, const std::string &password) const
+{
+    std::ofstream file_stream;
+    open_stream(file_stream, filename.string());
+    save(file_stream, password);
+}
+
 void workbook::save(std::ostream &stream) const
 {
     detail::xlsx_producer producer(*this);
     producer.write(stream);
 }
 
-void workbook::save(std::ostream &stream, const std::string &password)
+void workbook::save(std::ostream &stream, const std::string &password) const
 {
     detail::xlsx_producer producer(*this);
     producer.write(stream, password);
 }
 
 #ifdef _MSC_VER
-void workbook::save(const std::wstring &filename)
+void workbook::save(const std::wstring &filename) const
 {
     std::ofstream file_stream;
     open_stream(file_stream, filename);
     save(file_stream);
 }
 
-void workbook::save(const std::wstring &filename, const std::string &password)
+void workbook::save(const std::wstring &filename, const std::string &password) const
 {
     std::ofstream file_stream;
     open_stream(file_stream, filename);
@@ -1402,33 +1453,21 @@ std::size_t workbook::rup_build() const
     return d_->file_version_.get().rup_build;
 }
 
-/// <summary>
-///
-/// </summary>
 bool workbook::has_calculation_properties() const
 {
     return d_->calculation_properties_.is_set();
 }
 
-/// <summary>
-///
-/// </summary>
 class calculation_properties workbook::calculation_properties() const
 {
     return d_->calculation_properties_.get();
 }
 
-/// <summary>
-///
-/// </summary>
 void workbook::calculation_properties(const class calculation_properties &props)
 {
     d_->calculation_properties_ = props;
 }
 
-/// <summary>
-/// Removes calcChain part from manifest if no formulae remain in workbook.
-/// </summary>
 void workbook::garbage_collect_formulae()
 {
     auto any_with_formula = false;

source/worksheet/tests/test_worksheet.hpp

@@ -222,7 +222,8 @@ public:
         xlnt::workbook wb;
         auto ws = wb.active_sheet();
         ws.cell("A1").hyperlink("http://test.com");
-        TS_ASSERT_EQUALS("http://test.com", ws.cell("A1").value<std::string>());
+        TS_ASSERT_EQUALS(ws.cell("A1").hyperlink(), "http://test.com");
+        TS_ASSERT_EQUALS(ws.cell("A1").value<std::string>(), "");
         ws.cell("A1").value("test");
         TS_ASSERT_EQUALS("test", ws.cell("A1").value<std::string>());
         TS_ASSERT_EQUALS(ws.cell("A1").hyperlink(), "http://test.com");

source/worksheet/worksheet.cpp

@@ -1010,6 +1010,11 @@ void worksheet::register_comments_in_manifest()
     workbook().register_worksheet_part(*this, relationship_type::comments);
 }
 
+void worksheet::register_calc_chain_in_manifest()
+{
+    workbook().register_workbook_part(relationship_type::calculation_chain);
+}
+
 bool worksheet::has_header_footer() const
 {
     return d_->header_footer_.is_set();

tests/helpers/xml_helper.hpp

@@ -16,6 +16,8 @@ public:
     {
         // content types are stored in unordered maps, too complicated to compare
         if (content_type == "[Content_Types].xml") return true;
+        // calcChain is optional
+        if (content_type == "application/vnd.openxmlformats-officedocument.spreadsheetml.calcChain+xml") return true;
 
         auto is_xml = (content_type.substr(0, 12) == "application/"
             && content_type.substr(content_type.size() - 4) == "+xml")
@@ -200,7 +202,7 @@ public:
                 std::cout << "right is missing file: " << left_member.string() << std::endl;
                 break;
             }
-
+            
             auto left_content_type = left_member.string() == "[Content_Types].xml"
                 ? "[Content_Types].xml" : left_manifest.content_type(left_member);
             auto right_content_type = left_member.string() == "[Content_Types].xml"