Restructure and rename

src/ifcparse/global_id.cpp

@@ -0,0 +1,148 @@
+/********************************************************************************
+ *                                                                              *
+ * This file is part of IfcOpenShell.                                           *
+ *                                                                              *
+ * IfcOpenShell is free software: you can redistribute it and/or modify         *
+ * it under the terms of the Lesser GNU General Public License as published by  *
+ * the Free Software Foundation, either version 3.0 of the License, or          *
+ * (at your option) any later version.                                          *
+ *                                                                              *
+ * IfcOpenShell is distributed in the hope that it will be useful,              *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of               *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                 *
+ * Lesser GNU General Public License for more details.                          *
+ *                                                                              *
+ * You should have received a copy of the Lesser GNU General Public License     *
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.         *
+ *                                                                              *
+ ********************************************************************************/
+
+#include "global_id.h"
+
+#include "exception.h"
+#include "logger.h"
+
+#include <algorithm>
+#include <boost/lexical_cast.hpp>
+#include <boost/uuid/uuid.hpp>
+#include <boost/uuid/uuid_generators.hpp>
+#include <boost/uuid/uuid_io.hpp>
+#include <boost/version.hpp>
+#include <vector>
+
+static const char* chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_$";
+
+// Converts an unsigned integer into a base64 string of length l
+std::string base64(unsigned value, int length) {
+    const int BASE64 = 64;
+    std::string result;
+    result.reserve(length);
+    while (value != 0U) {
+        result.push_back(chars[value % BASE64]);
+        value /= BASE64;
+    }
+    while ((int)result.size() != length) {
+        result.push_back('0');
+    }
+    std::reverse(result.begin(), result.end());
+    return result;
+}
+
+// Converts a base64 string into an unsigned integer
+unsigned from_base64(const std::string& string) {
+    std::string::size_type zeros = string.find_first_not_of('0');
+    unsigned result = 0;
+    if (zeros != std::string::npos) {
+        for (std::string::const_iterator i = string.begin() + zeros; i != string.end(); ++i) {
+            result *= 64;
+            const char* character = strchr(chars, *i);
+            if (character == nullptr) {
+                throw ifcopenshell::exception("Failed to decode GlobalId");
+            }
+            result += (unsigned)(character - chars);
+        }
+    }
+    return result;
+}
+
+// Compresses the UUID byte array into a base64 representation
+std::string compress(unsigned char* value) {
+    std::string result;
+    result.reserve(22);
+    result += base64(value[0], 2);
+    for (unsigned i = 1; i < 16; i += 3) {
+        result += base64((value[i] << 16) + (value[i + 1] << 8) + value[i + 2], 4);
+    }
+    return result;
+}
+
+// Expands the base64 representation into a UUID byte array
+void expand(const std::string& s, std::vector<unsigned char>& v) {
+    v.push_back((unsigned char)from_base64(s.substr(0, 2)));
+    for (unsigned i = 0; i < 5; ++i) {
+        unsigned d = from_base64(s.substr(2 + 4 * i, 4));
+        for (unsigned j = 0; j < 3; ++j) {
+            v.push_back((d >> (8 * (2 - j))) % 256);
+        }
+    }
+}
+
+// Define the macro to handle different Boost versions
+#if BOOST_VERSION >= 108600
+    static boost::uuids::basic_random_generator<std::mt19937> gen;
+#else
+    static boost::uuids::basic_random_generator<boost::mt19937> gen;
+#endif
+
+ifcopenshell::global_id::global_id() {
+    uuid_data_ = gen();
+    std::vector<unsigned char> v(uuid_data_.size());
+    std::copy(uuid_data_.begin(), uuid_data_.end(), v.begin());
+    string_data_ = compress(v.data());
+#if BOOST_VERSION < 104400
+    formatted_string = boost::lexical_cast<std::string>(uuid_data);
+#else
+    formatted_string_ = boost::uuids::to_string(uuid_data_);
+#endif
+
+#ifndef NDEBUG
+    std::vector<unsigned char> test_vector;
+    expand(string_data_, test_vector);
+    boost::uuids::uuid test_uuid;
+    std::copy(test_vector.begin(), test_vector.end(), test_uuid.begin());
+    if (uuid_data_ != test_uuid) {
+        logger::message(logger::LOG_ERROR, "Internal error generating GlobalId");
+    }
+#endif
+}
+
+ifcopenshell::global_id::global_id(const std::string& string)
+    : string_data_(string) {
+    std::vector<unsigned char> result;
+    expand(string_data_, result);
+    std::copy(result.begin(), result.end(), uuid_data_.begin());
+#if BOOST_VERSION < 104400
+    formatted_string_ = boost::lexical_cast<std::string>(uuid_data_);
+#else
+    formatted_string_ = boost::uuids::to_string(uuid_data_);
+#endif
+
+#ifndef NDEBUG
+    const std::string test_string = compress(&uuid_data_.data[0]);
+    if (string_data_ != test_string) {
+        logger::message(logger::LOG_ERROR, "Internal error generating GlobalId");
+    }
+#endif
+}
+
+ifcopenshell::global_id::operator const std::string&() const {
+    return string_data_;
+}
+
+ifcopenshell::global_id::operator const boost::uuids::uuid&() const {
+    return uuid_data_;
+}
+
+const std::string& ifcopenshell::global_id::formatted() const {
+    return formatted_string_;
+}