Revision 83419b9a61339a55a7b45194f4d85564724fbb4a authored by Anthony Jones on 10 December 2012, 13:50:24 UTC, committed by Anthony Jones on 10 December 2012, 13:50:24 UTC
1 parent e7aab5d
jsclone.cpp
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/FloatingPoint.h"
#include "jsclone.h"
#include "jsdate.h"
#include "jstypedarray.h"
#include "jstypedarrayinlines.h"
#include "vm/BooleanObject-inl.h"
#include "vm/NumberObject-inl.h"
#include "vm/RegExpObject-inl.h"
#include "vm/StringObject-inl.h"
using namespace js;
enum StructuredDataType {
/* Structured data types provided by the engine */
SCTAG_FLOAT_MAX = 0xFFF00000,
SCTAG_NULL = 0xFFFF0000,
SCTAG_UNDEFINED,
SCTAG_BOOLEAN,
SCTAG_INDEX,
SCTAG_STRING,
SCTAG_DATE_OBJECT,
SCTAG_REGEXP_OBJECT,
SCTAG_ARRAY_OBJECT,
SCTAG_OBJECT_OBJECT,
SCTAG_ARRAY_BUFFER_OBJECT,
SCTAG_BOOLEAN_OBJECT,
SCTAG_STRING_OBJECT,
SCTAG_NUMBER_OBJECT,
SCTAG_BACK_REFERENCE_OBJECT,
SCTAG_TRANSFER_MAP_HEADER,
SCTAG_TRANSFER_MAP,
SCTAG_TYPED_ARRAY_MIN = 0xFFFF0100,
SCTAG_TYPED_ARRAY_INT8 = SCTAG_TYPED_ARRAY_MIN + TypedArray::TYPE_INT8,
SCTAG_TYPED_ARRAY_UINT8 = SCTAG_TYPED_ARRAY_MIN + TypedArray::TYPE_UINT8,
SCTAG_TYPED_ARRAY_INT16 = SCTAG_TYPED_ARRAY_MIN + TypedArray::TYPE_INT16,
SCTAG_TYPED_ARRAY_UINT16 = SCTAG_TYPED_ARRAY_MIN + TypedArray::TYPE_UINT16,
SCTAG_TYPED_ARRAY_INT32 = SCTAG_TYPED_ARRAY_MIN + TypedArray::TYPE_INT32,
SCTAG_TYPED_ARRAY_UINT32 = SCTAG_TYPED_ARRAY_MIN + TypedArray::TYPE_UINT32,
SCTAG_TYPED_ARRAY_FLOAT32 = SCTAG_TYPED_ARRAY_MIN + TypedArray::TYPE_FLOAT32,
SCTAG_TYPED_ARRAY_FLOAT64 = SCTAG_TYPED_ARRAY_MIN + TypedArray::TYPE_FLOAT64,
SCTAG_TYPED_ARRAY_UINT8_CLAMPED = SCTAG_TYPED_ARRAY_MIN + TypedArray::TYPE_UINT8_CLAMPED,
SCTAG_TYPED_ARRAY_MAX = SCTAG_TYPED_ARRAY_MIN + TypedArray::TYPE_MAX - 1,
SCTAG_END_OF_BUILTIN_TYPES
};
enum TransferableMapHeader {
SCTAG_TM_NOT_MARKED = 0,
SCTAG_TM_MARKED
};
JS_FRIEND_API(uint64_t)
js_GetSCOffset(JSStructuredCloneWriter* writer)
{
JS_ASSERT(writer);
return writer->output().count() * sizeof(uint64_t);
}
static StructuredDataType
ArrayTypeToTag(uint32_t type)
{
JS_ASSERT(type < TypedArray::TYPE_MAX);
return static_cast<StructuredDataType>(uint32_t(SCTAG_TYPED_ARRAY_MIN) + type);
}
JS_STATIC_ASSERT(SCTAG_END_OF_BUILTIN_TYPES <= JS_SCTAG_USER_MIN);
JS_STATIC_ASSERT(JS_SCTAG_USER_MIN <= JS_SCTAG_USER_MAX);
JS_STATIC_ASSERT(TypedArray::TYPE_INT8 == 0);
static uint8_t
SwapBytes(uint8_t u)
{
return u;
}
static uint16_t
SwapBytes(uint16_t u)
{
#ifdef IS_BIG_ENDIAN
return ((u & 0x00ff) << 8) | ((u & 0xff00) >> 8);
#else
return u;
#endif
}
static uint32_t
SwapBytes(uint32_t u)
{
#ifdef IS_BIG_ENDIAN
return ((u & 0x000000ffU) << 24) |
((u & 0x0000ff00U) << 8) |
((u & 0x00ff0000U) >> 8) |
((u & 0xff000000U) >> 24);
#else
return u;
#endif
}
static uint64_t
SwapBytes(uint64_t u)
{
#ifdef IS_BIG_ENDIAN
return ((u & 0x00000000000000ffLLU) << 56) |
((u & 0x000000000000ff00LLU) << 40) |
((u & 0x0000000000ff0000LLU) << 24) |
((u & 0x00000000ff000000LLU) << 8) |
((u & 0x000000ff00000000LLU) >> 8) |
((u & 0x0000ff0000000000LLU) >> 24) |
((u & 0x00ff000000000000LLU) >> 40) |
((u & 0xff00000000000000LLU) >> 56);
#else
return u;
#endif
}
namespace js {
bool
WriteStructuredClone(JSContext *cx, const Value &v, uint64_t **bufp, size_t *nbytesp,
const JSStructuredCloneCallbacks *cb, void *cbClosure,
jsval transferable)
{
SCOutput out(cx);
JSStructuredCloneWriter w(out, cb, cbClosure, transferable);
return w.init() && w.write(v) && out.extractBuffer(bufp, nbytesp);
}
bool
ReadStructuredClone(JSContext *cx, uint64_t *data, size_t nbytes, Value *vp,
const JSStructuredCloneCallbacks *cb, void *cbClosure)
{
SCInput in(cx, data, nbytes);
/* XXX disallow callers from using internal pointers to GC things. */
SkipRoot skip(cx, &in);
JSStructuredCloneReader r(in, cb, cbClosure);
return r.read(vp);
}
bool
ClearStructuredClone(const uint64_t *data, size_t nbytes)
{
const uint64_t *point = data;
const uint64_t *end = data + nbytes / 8;
uint64_t u = SwapBytes(*point++);
uint32_t tag = uint32_t(u >> 32);
if (tag == SCTAG_TRANSFER_MAP_HEADER) {
if ((TransferableMapHeader)uint32_t(u) == SCTAG_TM_NOT_MARKED) {
while (point != end) {
uint64_t u = SwapBytes(*point++);
uint32_t tag = uint32_t(u >> 32);
if (tag == SCTAG_TRANSFER_MAP) {
u = SwapBytes(*point++);
js_free(reinterpret_cast<void*>(u));
}
}
}
}
js_free((void *)data);
return true;
}
bool
StructuredCloneHasTransferObjects(const uint64_t *data, size_t nbytes,
bool *hasTransferable)
{
*hasTransferable = false;
if (data) {
uint64_t u = SwapBytes(*data);
uint32_t tag = uint32_t(u >> 32);
if (tag == SCTAG_TRANSFER_MAP_HEADER) {
*hasTransferable = true;
}
}
return true;
}
} /* namespace js */
static inline uint64_t
PairToUInt64(uint32_t tag, uint32_t data)
{
return uint64_t(data) | (uint64_t(tag) << 32);
}
bool
SCInput::eof()
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_SC_BAD_SERIALIZED_DATA, "truncated");
return false;
}
SCInput::SCInput(JSContext *cx, uint64_t *data, size_t nbytes)
: cx(cx), point(data), end(data + nbytes / 8)
{
JS_ASSERT((uintptr_t(data) & 7) == 0);
JS_ASSERT((nbytes & 7) == 0);
}
bool
SCInput::read(uint64_t *p)
{
if (point == end)
return eof();
*p = SwapBytes(*point++);
return true;
}
bool
SCInput::readPair(uint32_t *tagp, uint32_t *datap)
{
uint64_t u = 0; /* initialize to shut GCC up */
bool ok = read(&u);
if (ok) {
*tagp = uint32_t(u >> 32);
*datap = uint32_t(u);
}
return ok;
}
bool
SCInput::get(uint64_t *p)
{
if (point == end)
return eof();
*p = SwapBytes(*point);
return true;
}
bool
SCInput::getPair(uint32_t *tagp, uint32_t *datap)
{
uint64_t u;
if (!get(&u))
return false;
*tagp = uint32_t(u >> 32);
*datap = uint32_t(u);
return true;
}
bool
SCInput::replace(uint64_t u)
{
if (point == end)
return eof();
*point = SwapBytes(u);
return true;
}
bool
SCInput::replacePair(uint32_t tag, uint32_t data)
{
return replace(PairToUInt64(tag, data));
}
/*
* The purpose of this never-inlined function is to avoid a strange g++ build
* error on OS X 10.5 (see bug 624080). :-(
*/
static JS_NEVER_INLINE double
CanonicalizeNan(double d)
{
return JS_CANONICALIZE_NAN(d);
}
bool
SCInput::readDouble(double *p)
{
union {
uint64_t u;
double d;
} pun;
if (!read(&pun.u))
return false;
*p = CanonicalizeNan(pun.d);
return true;
}
template <class T>
bool
SCInput::readArray(T *p, size_t nelems)
{
JS_STATIC_ASSERT(sizeof(uint64_t) % sizeof(T) == 0);
/*
* Fail if nelems is so huge as to make JS_HOWMANY overflow or if nwords is
* larger than the remaining data.
*/
size_t nwords = JS_HOWMANY(nelems, sizeof(uint64_t) / sizeof(T));
if (nelems + sizeof(uint64_t) / sizeof(T) - 1 < nelems || nwords > size_t(end - point))
return eof();
if (sizeof(T) == 1) {
js_memcpy(p, point, nelems);
} else {
const T *q = (const T *) point;
const T *qend = q + nelems;
while (q != qend)
*p++ = ::SwapBytes(*q++);
}
point += nwords;
return true;
}
bool
SCInput::readBytes(void *p, size_t nbytes)
{
return readArray((uint8_t *) p, nbytes);
}
bool
SCInput::readChars(jschar *p, size_t nchars)
{
JS_ASSERT(sizeof(jschar) == sizeof(uint16_t));
return readArray((uint16_t *) p, nchars);
}
bool
SCInput::readPtr(void **p)
{
return read((uint64_t *)p);
}
SCOutput::SCOutput(JSContext *cx) : cx(cx), buf(cx) {}
bool
SCOutput::write(uint64_t u)
{
return buf.append(SwapBytes(u));
}
bool
SCOutput::writePair(uint32_t tag, uint32_t data)
{
/*
* As it happens, the tag word appears after the data word in the output.
* This is because exponents occupy the last 2 bytes of doubles on the
* little-endian platforms we care most about.
*
* For example, JSVAL_TRUE is written using writePair(SCTAG_BOOLEAN, 1).
* PairToUInt64 produces the number 0xFFFF000200000001.
* That is written out as the bytes 01 00 00 00 02 00 FF FF.
*/
return write(PairToUInt64(tag, data));
}
static inline uint64_t
ReinterpretDoubleAsUInt64(double d)
{
union {
double d;
uint64_t u;
} pun;
pun.d = d;
return pun.u;
}
static inline double
ReinterpretUInt64AsDouble(uint64_t u)
{
union {
uint64_t u;
double d;
} pun;
pun.u = u;
return pun.d;
}
static inline double
ReinterpretPairAsDouble(uint32_t tag, uint32_t data)
{
return ReinterpretUInt64AsDouble(PairToUInt64(tag, data));
}
bool
SCOutput::writeDouble(double d)
{
return write(ReinterpretDoubleAsUInt64(CanonicalizeNan(d)));
}
template <class T>
bool
SCOutput::writeArray(const T *p, size_t nelems)
{
JS_ASSERT(8 % sizeof(T) == 0);
JS_ASSERT(sizeof(uint64_t) % sizeof(T) == 0);
if (nelems == 0)
return true;
if (nelems + sizeof(uint64_t) / sizeof(T) - 1 < nelems) {
js_ReportAllocationOverflow(context());
return false;
}
size_t nwords = JS_HOWMANY(nelems, sizeof(uint64_t) / sizeof(T));
size_t start = buf.length();
if (!buf.growByUninitialized(nwords))
return false;
buf.back() = 0; /* zero-pad to an 8-byte boundary */
T *q = (T *) &buf[start];
if (sizeof(T) == 1) {
js_memcpy(q, p, nelems);
} else {
const T *pend = p + nelems;
while (p != pend)
*q++ = ::SwapBytes(*p++);
}
return true;
}
bool
SCOutput::writeBytes(const void *p, size_t nbytes)
{
return writeArray((const uint8_t *) p, nbytes);
}
bool
SCOutput::writeChars(const jschar *p, size_t nchars)
{
JS_ASSERT(sizeof(jschar) == sizeof(uint16_t));
return writeArray((const uint16_t *) p, nchars);
}
bool
SCOutput::writePtr(const void *p)
{
return write(reinterpret_cast<uint64_t>(p));
}
bool
SCOutput::extractBuffer(uint64_t **datap, size_t *sizep)
{
*sizep = buf.length() * sizeof(uint64_t);
return (*datap = buf.extractRawBuffer()) != NULL;
}
JS_STATIC_ASSERT(JSString::MAX_LENGTH < UINT32_MAX);
bool
JSStructuredCloneWriter::parseTransferable()
{
transferableObjects.clear();
if (JSVAL_IS_NULL(transferable) || JSVAL_IS_VOID(transferable))
return true;
if (!transferable.isObject()) {
reportErrorTransferable();
return false;
}
JSObject* array = &transferable.toObject();
if (!JS_IsArrayObject(context(), array)) {
reportErrorTransferable();
return false;
}
uint32_t length;
if (!JS_GetArrayLength(context(), array, &length)) {
return false;
}
for (uint32_t i = 0; i < length; ++i) {
Value v;
if (!JS_GetElement(context(), array, i, &v)) {
return false;
}
if (!v.isObject()) {
reportErrorTransferable();
return false;
}
JSObject* tObj = &v.toObject();
if (!tObj->isArrayBuffer()) {
reportErrorTransferable();
return false;
}
// No duplicate:
if (transferableObjects.has(tObj)) {
reportErrorTransferable();
return false;
}
if (!transferableObjects.putNew(tObj))
return false;
}
return true;
}
void
JSStructuredCloneWriter::reportErrorTransferable()
{
if (callbacks && callbacks->reportError)
return callbacks->reportError(context(), JS_SCERR_TRANSFERABLE);
}
bool
JSStructuredCloneWriter::writeString(uint32_t tag, JSString *str)
{
size_t length = str->length();
const jschar *chars = str->getChars(context());
if (!chars)
return false;
return out.writePair(tag, uint32_t(length)) && out.writeChars(chars, length);
}
bool
JSStructuredCloneWriter::writeId(jsid id)
{
if (JSID_IS_INT(id))
return out.writePair(SCTAG_INDEX, uint32_t(JSID_TO_INT(id)));
JS_ASSERT(JSID_IS_STRING(id));
return writeString(SCTAG_STRING, JSID_TO_STRING(id));
}
inline void
JSStructuredCloneWriter::checkStack()
{
#ifdef DEBUG
/* To avoid making serialization O(n^2), limit stack-checking at 10. */
const size_t MAX = 10;
size_t limit = Min(counts.length(), MAX);
JS_ASSERT(objs.length() == counts.length());
size_t total = 0;
for (size_t i = 0; i < limit; i++) {
JS_ASSERT(total + counts[i] >= total);
total += counts[i];
}
if (counts.length() <= MAX)
JS_ASSERT(total == ids.length());
else
JS_ASSERT(total <= ids.length());
size_t j = objs.length();
for (size_t i = 0; i < limit; i++)
JS_ASSERT(memory.has(&objs[--j].toObject()));
#endif
}
JS_PUBLIC_API(JSBool)
JS_WriteTypedArray(JSStructuredCloneWriter *w, jsval v)
{
JS_ASSERT(v.isObject());
RootedObject obj(w->context(), &v.toObject());
// If the object is a security wrapper, try puncturing it. This may throw
// if the access is not allowed.
if (obj->isWrapper()) {
JSObject *unwrapped = UnwrapObjectChecked(w->context(), obj);
if (!unwrapped)
return false;
obj = unwrapped;
}
return w->writeTypedArray(obj);
}
bool
JSStructuredCloneWriter::writeTypedArray(HandleObject arr)
{
if (!out.writePair(ArrayTypeToTag(TypedArray::type(arr)), TypedArray::length(arr)))
return false;
switch (TypedArray::type(arr)) {
case TypedArray::TYPE_INT8:
case TypedArray::TYPE_UINT8:
case TypedArray::TYPE_UINT8_CLAMPED:
return out.writeArray((const uint8_t *) TypedArray::viewData(arr), TypedArray::length(arr));
case TypedArray::TYPE_INT16:
case TypedArray::TYPE_UINT16:
return out.writeArray((const uint16_t *) TypedArray::viewData(arr), TypedArray::length(arr));
case TypedArray::TYPE_INT32:
case TypedArray::TYPE_UINT32:
case TypedArray::TYPE_FLOAT32:
return out.writeArray((const uint32_t *) TypedArray::viewData(arr), TypedArray::length(arr));
case TypedArray::TYPE_FLOAT64:
return out.writeArray((const uint64_t *) TypedArray::viewData(arr), TypedArray::length(arr));
default:
JS_NOT_REACHED("unknown TypedArray type");
return false;
}
}
bool
JSStructuredCloneWriter::writeArrayBuffer(JSHandleObject obj)
{
ArrayBufferObject &buffer = obj->asArrayBuffer();
return out.writePair(SCTAG_ARRAY_BUFFER_OBJECT, buffer.byteLength()) &&
out.writeBytes(buffer.dataPointer(), buffer.byteLength());
}
bool
JSStructuredCloneWriter::startObject(JSHandleObject obj, bool *backref)
{
/* Handle cycles in the object graph. */
CloneMemory::AddPtr p = memory.lookupForAdd(obj);
if ((*backref = p))
return out.writePair(SCTAG_BACK_REFERENCE_OBJECT, p->value);
if (!memory.add(p, obj, memory.count()))
return false;
if (memory.count() == UINT32_MAX) {
JS_ReportErrorNumber(context(), js_GetErrorMessage, NULL,
JSMSG_NEED_DIET, "object graph to serialize");
return false;
}
return true;
}
bool
JSStructuredCloneWriter::traverseObject(JSHandleObject obj)
{
/*
* Get enumerable property ids and put them in reverse order so that they
* will come off the stack in forward order.
*/
size_t initialLength = ids.length();
if (!GetPropertyNames(context(), obj, JSITER_OWNONLY, &ids))
return false;
jsid *begin = ids.begin() + initialLength, *end = ids.end();
size_t count = size_t(end - begin);
Reverse(begin, end);
/* Push obj and count to the stack. */
if (!objs.append(ObjectValue(*obj)) || !counts.append(count))
return false;
checkStack();
/* Write the header for obj. */
return out.writePair(obj->isArray() ? SCTAG_ARRAY_OBJECT : SCTAG_OBJECT_OBJECT, 0);
}
bool
JSStructuredCloneWriter::startWrite(const Value &v)
{
assertSameCompartment(context(), v);
if (v.isString()) {
return writeString(SCTAG_STRING, v.toString());
} else if (v.isNumber()) {
return out.writeDouble(v.toNumber());
} else if (v.isBoolean()) {
return out.writePair(SCTAG_BOOLEAN, v.toBoolean());
} else if (v.isNull()) {
return out.writePair(SCTAG_NULL, 0);
} else if (v.isUndefined()) {
return out.writePair(SCTAG_UNDEFINED, 0);
} else if (v.isObject()) {
RootedObject obj(context(), &v.toObject());
// The object might be a security wrapper. See if we can clone what's
// behind it. If we can, unwrap the object.
obj = UnwrapObjectChecked(context(), obj);
if (!obj)
return false;
AutoCompartment ac(context(), obj);
bool backref;
if (!startObject(obj, &backref))
return false;
if (backref)
return true;
if (obj->isRegExp()) {
RegExpObject &reobj = obj->asRegExp();
return out.writePair(SCTAG_REGEXP_OBJECT, reobj.getFlags()) &&
writeString(SCTAG_STRING, reobj.getSource());
} else if (obj->isDate()) {
double d = js_DateGetMsecSinceEpoch(obj);
return out.writePair(SCTAG_DATE_OBJECT, 0) && out.writeDouble(d);
} else if (obj->isTypedArray()) {
return writeTypedArray(obj);
} else if (obj->isArrayBuffer() && obj->asArrayBuffer().hasData()) {
return writeArrayBuffer(obj);
} else if (obj->isObject() || obj->isArray()) {
return traverseObject(obj);
} else if (obj->isBoolean()) {
return out.writePair(SCTAG_BOOLEAN_OBJECT, obj->asBoolean().unbox());
} else if (obj->isNumber()) {
return out.writePair(SCTAG_NUMBER_OBJECT, 0) &&
out.writeDouble(obj->asNumber().unbox());
} else if (obj->isString()) {
return writeString(SCTAG_STRING_OBJECT, obj->asString().unbox());
}
if (callbacks && callbacks->write)
return callbacks->write(context(), this, obj, closure);
/* else fall through */
}
JS_ReportErrorNumber(context(), js_GetErrorMessage, NULL, JSMSG_SC_UNSUPPORTED_TYPE);
return false;
}
bool
JSStructuredCloneWriter::writeTransferMap()
{
if (!transferableObjects.empty()) {
if (!out.writePair(SCTAG_TRANSFER_MAP_HEADER, (uint32_t)SCTAG_TM_NOT_MARKED))
return false;
for (HashSet<JSObject*>::Range r = transferableObjects.all();
!r.empty(); r.popFront()) {
JSObject *obj = r.front();
if (!memory.put(obj, memory.count()))
return false;
void *content;
uint8_t *data;
if (!JS_StealArrayBufferContents(context(), obj, &content, &data))
return false;
if (!out.writePair(SCTAG_TRANSFER_MAP, 0) || !out.writePtr(content))
return false;
}
}
return true;
}
bool
JSStructuredCloneWriter::write(const Value &v)
{
if (!startWrite(v))
return false;
while (!counts.empty()) {
RootedObject obj(context(), &objs.back().toObject());
AutoCompartment ac(context(), obj);
if (counts.back()) {
counts.back()--;
RootedId id(context(), ids.back());
ids.popBack();
checkStack();
if (JSID_IS_STRING(id) || JSID_IS_INT(id)) {
/*
* If obj still has an own property named id, write it out.
* The cost of re-checking could be avoided by using
* NativeIterators.
*/
RootedObject obj2(context());
RootedShape prop(context());
if (!js_HasOwnProperty(context(), obj->getOps()->lookupGeneric, obj, id,
&obj2, &prop)) {
return false;
}
if (prop) {
RootedValue val(context());
if (!writeId(id) ||
!JSObject::getGeneric(context(), obj, obj, id, &val) ||
!startWrite(val))
return false;
}
}
} else {
out.writePair(SCTAG_NULL, 0);
objs.popBack();
counts.popBack();
}
}
memory.clear();
return true;
}
bool
JSStructuredCloneReader::checkDouble(double d)
{
jsval_layout l;
l.asDouble = d;
if (!JSVAL_IS_DOUBLE_IMPL(l)) {
JS_ReportErrorNumber(context(), js_GetErrorMessage, NULL,
JSMSG_SC_BAD_SERIALIZED_DATA, "unrecognized NaN");
return false;
}
return true;
}
class Chars {
JSContext *cx;
jschar *p;
public:
Chars(JSContext *cx) : cx(cx), p(NULL) {}
~Chars() { if (p) js_free(p); }
bool allocate(size_t len) {
JS_ASSERT(!p);
// We're going to null-terminate!
p = cx->pod_malloc<jschar>(len + 1);
if (p) {
p[len] = jschar(0);
return true;
}
return false;
}
jschar *get() { return p; }
void forget() { p = NULL; }
};
JSString *
JSStructuredCloneReader::readString(uint32_t nchars)
{
if (nchars > JSString::MAX_LENGTH) {
JS_ReportErrorNumber(context(), js_GetErrorMessage, NULL, JSMSG_SC_BAD_SERIALIZED_DATA,
"string length");
return NULL;
}
Chars chars(context());
if (!chars.allocate(nchars) || !in.readChars(chars.get(), nchars))
return NULL;
JSString *str = js_NewString(context(), chars.get(), nchars);
if (str)
chars.forget();
return str;
}
JS_PUBLIC_API(JSBool)
JS_ReadTypedArray(JSStructuredCloneReader *r, jsval *vp)
{
uint32_t tag, nelems;
if (!r->input().readPair(&tag, &nelems))
return false;
JS_ASSERT(tag >= SCTAG_TYPED_ARRAY_MIN && tag <= SCTAG_TYPED_ARRAY_MAX);
return r->readTypedArray(tag, nelems, vp);
}
bool
JSStructuredCloneReader::readTypedArray(uint32_t tag, uint32_t nelems, Value *vp)
{
RootedObject obj(context(), NULL);
switch (tag) {
case SCTAG_TYPED_ARRAY_INT8:
obj = JS_NewInt8Array(context(), nelems);
break;
case SCTAG_TYPED_ARRAY_UINT8:
obj = JS_NewUint8Array(context(), nelems);
break;
case SCTAG_TYPED_ARRAY_INT16:
obj = JS_NewInt16Array(context(), nelems);
break;
case SCTAG_TYPED_ARRAY_UINT16:
obj = JS_NewUint16Array(context(), nelems);
break;
case SCTAG_TYPED_ARRAY_INT32:
obj = JS_NewInt32Array(context(), nelems);
break;
case SCTAG_TYPED_ARRAY_UINT32:
obj = JS_NewUint32Array(context(), nelems);
break;
case SCTAG_TYPED_ARRAY_FLOAT32:
obj = JS_NewFloat32Array(context(), nelems);
break;
case SCTAG_TYPED_ARRAY_FLOAT64:
obj = JS_NewFloat64Array(context(), nelems);
break;
case SCTAG_TYPED_ARRAY_UINT8_CLAMPED:
obj = JS_NewUint8ClampedArray(context(), nelems);
break;
default:
JS_NOT_REACHED("unknown TypedArray type");
return false;
}
if (!obj)
return false;
vp->setObject(*obj);
JS_ASSERT(TypedArray::length(obj) == nelems);
switch (tag) {
case SCTAG_TYPED_ARRAY_INT8:
return in.readArray((uint8_t*) JS_GetInt8ArrayData(obj, context()), nelems);
case SCTAG_TYPED_ARRAY_UINT8:
return in.readArray(JS_GetUint8ArrayData(obj, context()), nelems);
case SCTAG_TYPED_ARRAY_INT16:
return in.readArray((uint16_t*) JS_GetInt16ArrayData(obj, context()), nelems);
case SCTAG_TYPED_ARRAY_UINT16:
return in.readArray(JS_GetUint16ArrayData(obj, context()), nelems);
case SCTAG_TYPED_ARRAY_INT32:
return in.readArray((uint32_t*) JS_GetInt32ArrayData(obj, context()), nelems);
case SCTAG_TYPED_ARRAY_UINT32:
return in.readArray(JS_GetUint32ArrayData(obj, context()), nelems);
case SCTAG_TYPED_ARRAY_FLOAT32:
return in.readArray((uint32_t*) JS_GetFloat32ArrayData(obj, context()), nelems);
case SCTAG_TYPED_ARRAY_FLOAT64:
return in.readArray((uint64_t*) JS_GetFloat64ArrayData(obj, context()), nelems);
case SCTAG_TYPED_ARRAY_UINT8_CLAMPED:
return in.readArray(JS_GetUint8ClampedArrayData(obj, context()), nelems);
default:
JS_NOT_REACHED("unknown TypedArray type");
return false;
}
}
bool
JSStructuredCloneReader::readArrayBuffer(uint32_t nbytes, Value *vp)
{
JSObject *obj = ArrayBufferObject::create(context(), nbytes);
if (!obj)
return false;
vp->setObject(*obj);
ArrayBufferObject &buffer = obj->asArrayBuffer();
JS_ASSERT(buffer.byteLength() == nbytes);
return in.readArray(buffer.dataPointer(), nbytes);
}
bool
JSStructuredCloneReader::startRead(Value *vp)
{
uint32_t tag, data;
if (!in.readPair(&tag, &data))
return false;
switch (tag) {
case SCTAG_NULL:
vp->setNull();
break;
case SCTAG_UNDEFINED:
vp->setUndefined();
break;
case SCTAG_BOOLEAN:
case SCTAG_BOOLEAN_OBJECT:
vp->setBoolean(!!data);
if (tag == SCTAG_BOOLEAN_OBJECT && !js_PrimitiveToObject(context(), vp))
return false;
break;
case SCTAG_STRING:
case SCTAG_STRING_OBJECT: {
JSString *str = readString(data);
if (!str)
return false;
vp->setString(str);
if (tag == SCTAG_STRING_OBJECT && !js_PrimitiveToObject(context(), vp))
return false;
break;
}
case SCTAG_NUMBER_OBJECT: {
double d;
if (!in.readDouble(&d) || !checkDouble(d))
return false;
vp->setDouble(d);
if (!js_PrimitiveToObject(context(), vp))
return false;
break;
}
case SCTAG_DATE_OBJECT: {
double d;
if (!in.readDouble(&d) || !checkDouble(d))
return false;
if (!MOZ_DOUBLE_IS_NaN(d) && d != TimeClip(d)) {
JS_ReportErrorNumber(context(), js_GetErrorMessage, NULL, JSMSG_SC_BAD_SERIALIZED_DATA,
"date");
return false;
}
JSObject *obj = js_NewDateObjectMsec(context(), d);
if (!obj)
return false;
vp->setObject(*obj);
break;
}
case SCTAG_REGEXP_OBJECT: {
RegExpFlag flags = RegExpFlag(data);
uint32_t tag2, nchars;
if (!in.readPair(&tag2, &nchars))
return false;
if (tag2 != SCTAG_STRING) {
JS_ReportErrorNumber(context(), js_GetErrorMessage, NULL, JSMSG_SC_BAD_SERIALIZED_DATA,
"regexp");
return false;
}
JSString *str = readString(nchars);
if (!str)
return false;
JSStableString *stable = str->ensureStable(context());
if (!stable)
return false;
size_t length = stable->length();
const jschar *chars = stable->chars();
RegExpObject *reobj = RegExpObject::createNoStatics(context(), chars, length, flags, NULL);
if (!reobj)
return false;
vp->setObject(*reobj);
break;
}
case SCTAG_ARRAY_OBJECT:
case SCTAG_OBJECT_OBJECT: {
JSObject *obj = (tag == SCTAG_ARRAY_OBJECT)
? NewDenseEmptyArray(context())
: NewBuiltinClassInstance(context(), &ObjectClass);
if (!obj || !objs.append(ObjectValue(*obj)))
return false;
vp->setObject(*obj);
break;
}
case SCTAG_BACK_REFERENCE_OBJECT: {
if (data >= allObjs.length()) {
JS_ReportErrorNumber(context(), js_GetErrorMessage, NULL,
JSMSG_SC_BAD_SERIALIZED_DATA,
"invalid back reference in input");
return false;
}
*vp = allObjs[data];
return true;
}
case SCTAG_TRANSFER_MAP_HEADER:
// A map header cannot be here but just at the beginning of the buffer.
JS_ReportErrorNumber(context(), js_GetErrorMessage, NULL,
JSMSG_SC_BAD_SERIALIZED_DATA,
"invalid input");
return false;
case SCTAG_TRANSFER_MAP:
// A map cannot be here but just at the beginning of the buffer.
JS_ReportErrorNumber(context(), js_GetErrorMessage, NULL,
JSMSG_SC_BAD_SERIALIZED_DATA,
"invalid input");
return false;
case SCTAG_ARRAY_BUFFER_OBJECT:
if (!readArrayBuffer(data, vp))
return false;
break;
default: {
if (tag <= SCTAG_FLOAT_MAX) {
double d = ReinterpretPairAsDouble(tag, data);
if (!checkDouble(d))
return false;
vp->setNumber(d);
break;
}
if (SCTAG_TYPED_ARRAY_MIN <= tag && tag <= SCTAG_TYPED_ARRAY_MAX) {
if (!readTypedArray(tag, data, vp))
return false;
break;
}
if (!callbacks || !callbacks->read) {
JS_ReportErrorNumber(context(), js_GetErrorMessage, NULL, JSMSG_SC_BAD_SERIALIZED_DATA,
"unsupported type");
return false;
}
JSObject *obj = callbacks->read(context(), this, tag, data, closure);
if (!obj)
return false;
vp->setObject(*obj);
}
}
if (vp->isObject() && !allObjs.append(*vp))
return false;
return true;
}
bool
JSStructuredCloneReader::readId(jsid *idp)
{
uint32_t tag, data;
if (!in.readPair(&tag, &data))
return false;
if (tag == SCTAG_INDEX) {
*idp = INT_TO_JSID(int32_t(data));
return true;
}
if (tag == SCTAG_STRING) {
JSString *str = readString(data);
if (!str)
return false;
JSAtom *atom = AtomizeString(context(), str);
if (!atom)
return false;
*idp = NON_INTEGER_ATOM_TO_JSID(atom);
return true;
}
if (tag == SCTAG_NULL) {
*idp = JSID_VOID;
return true;
}
JS_ReportErrorNumber(context(), js_GetErrorMessage, NULL, JSMSG_SC_BAD_SERIALIZED_DATA, "id");
return false;
}
bool
JSStructuredCloneReader::readTransferMap()
{
uint32_t tag, data;
if (!in.getPair(&tag, &data))
return false;
if (tag != SCTAG_TRANSFER_MAP_HEADER ||
(TransferableMapHeader)data == SCTAG_TM_MARKED)
return true;
if (!in.replacePair(SCTAG_TRANSFER_MAP_HEADER, SCTAG_TM_MARKED))
return false;
if (!in.readPair(&tag, &data))
return false;
while (1) {
if (!in.getPair(&tag, &data))
return false;
if (tag != SCTAG_TRANSFER_MAP)
break;
void *content;
if (!in.readPair(&tag, &data) || !in.readPtr(&content))
return false;
JSObject *obj = JS_NewArrayBufferWithContents(context(), content);
if (!obj || !allObjs.append(ObjectValue(*obj)))
return false;
}
return true;
}
bool
JSStructuredCloneReader::read(Value *vp)
{
if (!readTransferMap())
return false;
if (!startRead(vp))
return false;
while (objs.length() != 0) {
RootedObject obj(context(), &objs.back().toObject());
RootedId id(context());
if (!readId(id.address()))
return false;
if (JSID_IS_VOID(id)) {
objs.popBack();
} else {
RootedValue v(context());
if (!startRead(v.address()) || !JSObject::defineGeneric(context(), obj, id, v))
return false;
}
}
allObjs.clear();
return true;
}
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