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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is JavaScript structured data serialization.
*
* The Initial Developer of the Original Code is
* the Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Jason Orendorff <jorendorff@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef jsclone_h___
#define jsclone_h___
#include "jsapi.h"
#include "jscntxt.h"
#include "jshashtable.h"
#include "jsstdint.h"
#include "jsvector.h"
#include "jsvalue.h"
namespace js {
bool
WriteStructuredClone(JSContext *cx, const Value &v, uint64_t **bufp, size_t *nbytesp,
const JSStructuredCloneCallbacks *cb, void *cbClosure);
bool
ReadStructuredClone(JSContext *cx, const uint64_t *data, size_t nbytes, Value *vp,
const JSStructuredCloneCallbacks *cb, void *cbClosure);
struct SCOutput {
public:
explicit SCOutput(JSContext *cx);
JSContext *context() const { return cx; }
bool write(uint64_t u);
bool writePair(uint32_t tag, uint32_t data);
bool writeDouble(jsdouble d);
bool writeBytes(const void *p, size_t nbytes);
bool writeChars(const jschar *p, size_t nchars);
template <class T>
bool writeArray(const T *p, size_t nbytes);
bool extractBuffer(uint64_t **datap, size_t *sizep);
private:
JSContext *cx;
js::Vector<uint64_t> buf;
};
struct SCInput {
public:
SCInput(JSContext *cx, const uint64_t *data, size_t nbytes);
JSContext *context() const { return cx; }
bool read(uint64_t *p);
bool readPair(uint32_t *tagp, uint32_t *datap);
bool readDouble(jsdouble *p);
bool readBytes(void *p, size_t nbytes);
bool readChars(jschar *p, size_t nchars);
template <class T>
bool readArray(T *p, size_t nelems);
private:
bool eof();
void staticAssertions() {
JS_STATIC_ASSERT(sizeof(jschar) == 2);
JS_STATIC_ASSERT(sizeof(uint32_t) == 4);
JS_STATIC_ASSERT(sizeof(jsdouble) == 8);
}
JSContext *cx;
const uint64_t *point;
const uint64_t *end;
};
}
struct JSStructuredCloneReader {
public:
explicit JSStructuredCloneReader(js::SCInput &in, const JSStructuredCloneCallbacks *cb,
void *cbClosure)
: in(in), objs(in.context()), callbacks(cb), closure(cbClosure) { }
js::SCInput &input() { return in; }
bool read(js::Value *vp);
private:
JSContext *context() { return in.context(); }
bool checkDouble(jsdouble d);
JSString *readString(uint32_t nchars);
bool readTypedArray(uint32_t tag, uint32_t nelems, js::Value *vp);
bool readArrayBuffer(uint32_t nbytes, js::Value *vp);
bool readId(jsid *idp);
bool startRead(js::Value *vp);
js::SCInput ∈
// Stack of objects with properties remaining to be read.
js::AutoValueVector objs;
// The user defined callbacks that will be used for cloning.
const JSStructuredCloneCallbacks *callbacks;
// Any value passed to JS_ReadStructuredClone.
void *closure;
};
struct JSStructuredCloneWriter {
public:
explicit JSStructuredCloneWriter(js::SCOutput &out, const JSStructuredCloneCallbacks *cb,
void *cbClosure)
: out(out), objs(out.context()), counts(out.context()), ids(out.context()),
memory(out.context()), callbacks(cb), closure(cbClosure) { }
bool init() { return memory.init(); }
bool write(const js::Value &v);
js::SCOutput &output() { return out; }
private:
JSContext *context() { return out.context(); }
bool writeString(uint32_t tag, JSString *str);
bool writeId(jsid id);
bool writeArrayBuffer(JSObject *obj);
bool writeTypedArray(JSObject *obj);
bool startObject(JSObject *obj);
bool startWrite(const js::Value &v);
inline void checkStack();
js::SCOutput &out;
// Stack of objects with properties remaining to be written.
js::AutoValueVector objs;
// counts[i] is the number of properties of objs[i] remaining to be written.
// counts.length() == objs.length() and sum(counts) == ids.length().
js::Vector<size_t> counts;
// Ids of properties remaining to be written.
js::AutoIdVector ids;
// The "memory" list described in the HTML5 internal structured cloning algorithm.
// memory has the same elements as objs.
js::HashSet<JSObject *> memory;
// The user defined callbacks that will be used for cloning.
const JSStructuredCloneCallbacks *callbacks;
// Any value passed to JS_WriteStructuredClone.
void *closure;
};
#endif /* jsclone_h___ */
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