1 files changed, 84 insertions, 0 deletions
diff --git a/src/mongo/scripting/mozjs/jsstringwrapper.cpp b/src/mongo/scripting/mozjs/jsstringwrapper.cpp
new file mode 100644
index 00000000000..8261b44a2fe
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+++ b/src/mongo/scripting/mozjs/jsstringwrapper.cpp
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+/**
+ * Copyright (C) 2015 MongoDB Inc.
+ *
+ * This program is free software: you can redistribute it and/or  modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program 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
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As a special exception, the copyright holders give permission to link the
+ * code of portions of this program with the OpenSSL library under certain
+ * conditions as described in each individual source file and distribute
+ * linked combinations including the program with the OpenSSL library. You
+ * must comply with the GNU Affero General Public License in all respects
+ * for all of the code used other than as permitted herein. If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so. If you do not
+ * wish to do so, delete this exception statement from your version. If you
+ * delete this exception statement from all source files in the program,
+ * then also delete it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/scripting/mozjs/jsstringwrapper.h"
+
+#include <js/CharacterEncoding.h>
+#include <jsapi.h>
+#include <utility>
+
+#include "mongo/base/error_codes.h"
+#include "mongo/scripting/mozjs/exception.h"
+#include "mongo/util/assert_util.h"
+
+namespace mongo {
+namespace mozjs {
+
+JSStringWrapper::JSStringWrapper(JSContext* cx, JSString* str) : _context(cx) {
+    if (!str)
+        throwCurrentJSException(cx, ErrorCodes::InternalError, "Cannot encode null JSString");
+
+    // We have to do this flatstring thing because no public api tells us
+    // how long the utf8 strings we get out are.
+    //
+    // Well, at least js/CharacterEncoding's GetDeflatedUTF8StringLength
+    // and JS_flattenString are all in the public headers...
+    JSFlatString* flat = JS_FlattenString(cx, str);
+    if (!flat)
+        throwCurrentJSException(cx, ErrorCodes::InternalError, "Failed to flatten JSString");
+
+    _length = JS::GetDeflatedUTF8StringLength(flat);
+
+    JS::RootedString rstr(cx, str);
+
+    JSAutoByteString abs;
+    abs.encodeUtf8(cx, rstr);
+
+    if (!abs)
+        throwCurrentJSException(cx, ErrorCodes::InternalError, "Failed to encode JSString");
+
+    _str.reset(new char[_length]);
+    std::memcpy(_str.get(), abs.ptr(), _length);
+}
+
+StringData JSStringWrapper::toStringData() const {
+    return StringData(_str.get(), _length);
+}
+
+std::string JSStringWrapper::toString() const {
+    return toStringData().toString();
+}
+
+JSStringWrapper::operator bool() const {
+    return _str.get();
+}
+
+}  // namespace mozjs
+}  // namespace mongo