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Diffstat (limited to 'src/mongo/scripting/mozjs/jsstringwrapper.cpp')
-rw-r--r-- | src/mongo/scripting/mozjs/jsstringwrapper.cpp | 84 |
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 --- /dev/null +++ b/src/mongo/scripting/mozjs/jsstringwrapper.cpp @@ -0,0 +1,84 @@ +/** + * 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 |