1 files changed, 115 insertions, 0 deletions
diff --git a/src/mongo/util/text.cpp b/src/mongo/util/text.cpp
new file mode 100644
index 00000000000..51a2556afdc
--- /dev/null
+++ b/src/mongo/util/text.cpp
@@ -0,0 +1,115 @@
+// text.cpp
+
+/*    Copyright 2009 10gen Inc.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+#include "pch.h"
+#include "text.h"
+#include "unittest.h"
+
+namespace mongo {
+
+    inline int leadingOnes(unsigned char c) {
+        if (c < 0x80) return 0;
+        static const char _leadingOnes[128] = {
+            1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x80 - 0x8F
+            1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x90 - 0x99
+            1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0xA0 - 0xA9
+            1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0xB0 - 0xB9
+            2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 0xC0 - 0xC9
+            2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 0xD0 - 0xD9
+            3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // 0xE0 - 0xE9
+            4, 4, 4, 4, 4, 4, 4, 4,                         // 0xF0 - 0xF7
+            5, 5, 5, 5,             // 0xF8 - 0xFB
+            6, 6,       // 0xFC - 0xFD
+            7,    // 0xFE
+            8, // 0xFF
+        };
+        return _leadingOnes[c & 0x7f];
+
+    }
+
+    bool isValidUTF8(const char *s) {
+        int left = 0; // how many bytes are left in the current codepoint
+        while (*s) {
+            const unsigned char c = (unsigned char) *(s++);
+            const int ones = leadingOnes(c);
+            if (left) {
+                if (ones != 1) return false; // should be a continuation byte
+                left--;
+            }
+            else {
+                if (ones == 0) continue; // ASCII byte
+                if (ones == 1) return false; // unexpected continuation byte
+                if (c > 0xF4) return false; // codepoint too large (< 0x10FFFF)
+                if (c == 0xC0 || c == 0xC1) return false; // codepoints <= 0x7F shouldn't be 2 bytes
+
+                // still valid
+                left = ones-1;
+            }
+        }
+        if (left!=0) return false; // string ended mid-codepoint
+        return true;
+    }
+
+#if defined(_WIN32)
+
+    std::string toUtf8String(const std::wstring& wide) {
+        if (wide.size() > boost::integer_traits<int>::const_max)
+            throw std::length_error(
+                "Wide string cannot be more than INT_MAX characters long.");
+        if (wide.size() == 0)
+            return "";
+
+        // Calculate necessary buffer size
+        int len = ::WideCharToMultiByte(
+                      CP_UTF8, 0, wide.c_str(), static_cast<int>(wide.size()),
+                      NULL, 0, NULL, NULL);
+
+        // Perform actual conversion
+        if (len > 0) {
+            std::vector<char> buffer(len);
+            len = ::WideCharToMultiByte(
+                      CP_UTF8, 0, wide.c_str(), static_cast<int>(wide.size()),
+                      &buffer[0], static_cast<int>(buffer.size()), NULL, NULL);
+            if (len > 0) {
+                assert(len == static_cast<int>(buffer.size()));
+                return std::string(&buffer[0], buffer.size());
+            }
+        }
+
+        throw boost::system::system_error(
+            ::GetLastError(), boost::system::system_category);
+    }
+
+#if defined(_UNICODE)
+    std::wstring toWideString(const char *s) {
+        std::basic_ostringstream<TCHAR> buf;
+        buf << s;
+        return buf.str();
+    }
+#endif
+
+#endif
+
+    struct TextUnitTest : public UnitTest {
+        void run() {
+            assert( parseLL("123") == 123 );
+            assert( parseLL("-123000000000") == -123000000000LL );
+        }
+    } textUnitTest;
+
+}
+