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tenfourfox/js/xpconnect/src/XPCConvert.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set ts=8 sts=4 et sw=4 tw=99: */
/* 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/. */
/* Data conversion between native and JavaScript types. */
#include "mozilla/ArrayUtils.h"
#include "mozilla/Range.h"
#include "xpcprivate.h"
#include "nsIAtom.h"
#include "nsWrapperCache.h"
#include "nsJSUtils.h"
#include "WrapperFactory.h"
#include "nsWrapperCacheInlines.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "js/CharacterEncoding.h"
#include "jsprf.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/DOMException.h"
#include "mozilla/dom/PrimitiveConversions.h"
#include "mozilla/jsipc/CrossProcessObjectWrappers.h"
using namespace xpc;
using namespace mozilla;
using namespace mozilla::dom;
using namespace JS;
//#define STRICT_CHECK_OF_UNICODE
#ifdef STRICT_CHECK_OF_UNICODE
#define ILLEGAL_RANGE(c) (0!=((c) & 0xFF80))
#else // STRICT_CHECK_OF_UNICODE
#define ILLEGAL_RANGE(c) (0!=((c) & 0xFF00))
#endif // STRICT_CHECK_OF_UNICODE
#define ILLEGAL_CHAR_RANGE(c) (0!=((c) & 0x80))
/***********************************************************/
// static
bool
XPCConvert::IsMethodReflectable(const XPTMethodDescriptor& info)
{
if (XPT_MD_IS_NOTXPCOM(info.flags) || XPT_MD_IS_HIDDEN(info.flags))
return false;
for (int i = info.num_args-1; i >= 0; i--) {
const nsXPTParamInfo& param = info.params[i];
const nsXPTType& type = param.GetType();
// Reflected methods can't use native types. All native types end up
// getting tagged as void*, so this check is easy.
if (type.TagPart() == nsXPTType::T_VOID)
return false;
}
return true;
}
static JSObject*
UnwrapNativeCPOW(nsISupports* wrapper)
{
nsCOMPtr<nsIXPConnectWrappedJS> underware = do_QueryInterface(wrapper);
if (underware) {
JSObject* mainObj = underware->GetJSObject();
if (mainObj && mozilla::jsipc::IsWrappedCPOW(mainObj))
return mainObj;
}
return nullptr;
}
/***************************************************************************/
// static
bool
XPCConvert::GetISupportsFromJSObject(JSObject* obj, nsISupports** iface)
{
const JSClass* jsclass = js::GetObjectJSClass(obj);
MOZ_ASSERT(jsclass, "obj has no class");
if (jsclass &&
(jsclass->flags & JSCLASS_HAS_PRIVATE) &&
(jsclass->flags & JSCLASS_PRIVATE_IS_NSISUPPORTS)) {
*iface = (nsISupports*) xpc_GetJSPrivate(obj);
return true;
}
*iface = UnwrapDOMObjectToISupports(obj);
return !!*iface;
}
/***************************************************************************/
// static
bool
XPCConvert::NativeData2JS(MutableHandleValue d, const void* s,
const nsXPTType& type, const nsID* iid, nsresult* pErr)
{
NS_PRECONDITION(s, "bad param");
AutoJSContext cx;
if (pErr)
*pErr = NS_ERROR_XPC_BAD_CONVERT_NATIVE;
switch (type.TagPart()) {
case nsXPTType::T_I8 :
d.setInt32(*static_cast<const int8_t*>(s));
return true;
case nsXPTType::T_I16 :
d.setInt32(*static_cast<const int16_t*>(s));
return true;
case nsXPTType::T_I32 :
d.setInt32(*static_cast<const int32_t*>(s));
return true;
case nsXPTType::T_I64 :
d.setNumber(static_cast<double>(*static_cast<const int64_t*>(s)));
return true;
case nsXPTType::T_U8 :
d.setInt32(*static_cast<const uint8_t*>(s));
return true;
case nsXPTType::T_U16 :
d.setInt32(*static_cast<const uint16_t*>(s));
return true;
case nsXPTType::T_U32 :
d.setNumber(*static_cast<const uint32_t*>(s));
return true;
case nsXPTType::T_U64 :
d.setNumber(static_cast<double>(*static_cast<const uint64_t*>(s)));
return true;
case nsXPTType::T_FLOAT :
d.setNumber(*static_cast<const float*>(s));
return true;
case nsXPTType::T_DOUBLE:
d.set(JS_NumberValue(*static_cast<const double*>(s)));
return true;
case nsXPTType::T_BOOL :
d.setBoolean(*static_cast<const bool*>(s));
return true;
case nsXPTType::T_CHAR :
{
char p = *static_cast<const char*>(s);
#ifdef STRICT_CHECK_OF_UNICODE
MOZ_ASSERT(! ILLEGAL_CHAR_RANGE(p) , "passing non ASCII data");
#endif // STRICT_CHECK_OF_UNICODE
JSString* str = JS_NewStringCopyN(cx, &p, 1);
if (!str)
return false;
d.setString(str);
return true;
}
case nsXPTType::T_WCHAR :
{
char16_t p = *static_cast<const char16_t*>(s);
JSString* str = JS_NewUCStringCopyN(cx, &p, 1);
if (!str)
return false;
d.setString(str);
return true;
}
case nsXPTType::T_JSVAL :
{
d.set(*static_cast<const Value*>(s));
return JS_WrapValue(cx, d);
}
case nsXPTType::T_VOID:
XPC_LOG_ERROR(("XPCConvert::NativeData2JS : void* params not supported"));
return false;
case nsXPTType::T_IID:
{
nsID* iid2 = *static_cast<nsID* const*>(s);
if (!iid2) {
d.setNull();
return true;
}
RootedObject scope(cx, JS::CurrentGlobalOrNull(cx));
JSObject* obj = xpc_NewIDObject(cx, scope, *iid2);
if (!obj)
return false;
d.setObject(*obj);
return true;
}
case nsXPTType::T_ASTRING:
// Fall through to T_DOMSTRING case
case nsXPTType::T_DOMSTRING:
{
const nsAString* p = *static_cast<const nsAString* const*>(s);
if (!p || p->IsVoid()) {
d.setNull();
return true;
}
nsStringBuffer* buf;
if (!XPCStringConvert::ReadableToJSVal(cx, *p, &buf, d))
return false;
if (buf)
buf->AddRef();
return true;
}
case nsXPTType::T_CHAR_STR:
{
const char* p = *static_cast<const char* const*>(s);
if (!p) {
d.setNull();
return true;
}
#ifdef STRICT_CHECK_OF_UNICODE
bool isAscii = true;
for (char* t = p; *t && isAscii; t++) {
if (ILLEGAL_CHAR_RANGE(*t))
isAscii = false;
}
MOZ_ASSERT(isAscii, "passing non ASCII data");
#endif // STRICT_CHECK_OF_UNICODE
JSString* str = JS_NewStringCopyZ(cx, p);
if (!str)
return false;
d.setString(str);
return true;
}
case nsXPTType::T_WCHAR_STR:
{
const char16_t* p = *static_cast<const char16_t* const*>(s);
if (!p) {
d.setNull();
return true;
}
JSString* str = JS_NewUCStringCopyZ(cx, p);
if (!str)
return false;
d.setString(str);
return true;
}
case nsXPTType::T_UTF8STRING:
{
const nsACString* utf8String = *static_cast<const nsACString* const*>(s);
if (!utf8String || utf8String->IsVoid()) {
d.setNull();
return true;
}
if (utf8String->IsEmpty()) {
d.set(JS_GetEmptyStringValue(cx));
return true;
}
const uint32_t len = CalcUTF8ToUnicodeLength(*utf8String);
// The cString is not empty at this point, but the calculated
// UTF-16 length is zero, meaning no valid conversion exists.
if (!len)
return false;
const size_t buffer_size = (len + 1) * sizeof(char16_t);
char16_t* buffer =
static_cast<char16_t*>(JS_malloc(cx, buffer_size));
if (!buffer)
return false;
uint32_t copied;
if (!UTF8ToUnicodeBuffer(*utf8String, buffer, &copied) ||
len != copied) {
// Copy or conversion during copy failed. Did not copy the
// whole string.
JS_free(cx, buffer);
return false;
}
// JS_NewUCString takes ownership on success, i.e. a
// successful call will make it the responsiblity of the JS VM
// to free the buffer.
JSString* str = JS_NewUCString(cx, buffer, len);
if (!str) {
JS_free(cx, buffer);
return false;
}
d.setString(str);
return true;
}
case nsXPTType::T_CSTRING:
{
const nsACString* cString = *static_cast<const nsACString* const*>(s);
if (!cString || cString->IsVoid()) {
d.setNull();
return true;
}
// c-strings (binary blobs) are deliberately not converted from
// UTF-8 to UTF-16. T_UTF8Sting is for UTF-8 encoded strings
// with automatic conversion.
JSString* str = JS_NewStringCopyN(cx, cString->Data(),
cString->Length());
if (!str)
return false;
d.setString(str);
return true;
}
case nsXPTType::T_INTERFACE:
case nsXPTType::T_INTERFACE_IS:
{
nsISupports* iface = *static_cast<nsISupports* const*>(s);
if (!iface) {
d.setNull();
return true;
}
if (iid->Equals(NS_GET_IID(nsIVariant))) {
nsCOMPtr<nsIVariant> variant = do_QueryInterface(iface);
if (!variant)
return false;
return XPCVariant::VariantDataToJS(variant,
pErr, d);
}
xpcObjectHelper helper(iface);
return NativeInterface2JSObject(d, nullptr, helper, iid, nullptr, true, pErr);
}
default:
NS_ERROR("bad type");
return false;
}
return true;
}
/***************************************************************************/
#ifdef DEBUG
static bool
CheckChar16InCharRange(char16_t c)
{
if (ILLEGAL_RANGE(c)) {
/* U+0080/U+0100 - U+FFFF data lost. */
static const size_t MSG_BUF_SIZE = 64;
char msg[MSG_BUF_SIZE];
JS_snprintf(msg, MSG_BUF_SIZE, "char16_t out of char range; high bits of data lost: 0x%x", c);
NS_WARNING(msg);
return false;
}
return true;
}
template<typename CharT>
static void
CheckCharsInCharRange(const CharT* chars, size_t len)
{
for (size_t i = 0; i < len; i++) {
if (!CheckChar16InCharRange(chars[i]))
break;
}
}
#endif
template<typename T>
bool ConvertToPrimitive(JSContext* cx, HandleValue v, T* retval)
{
return ValueToPrimitive<T, eDefault>(cx, v, retval);
}
// static
bool
XPCConvert::JSData2Native(void* d, HandleValue s,
const nsXPTType& type,
const nsID* iid,
nsresult* pErr)
{
NS_PRECONDITION(d, "bad param");
AutoJSContext cx;
if (pErr)
*pErr = NS_ERROR_XPC_BAD_CONVERT_JS;
switch (type.TagPart()) {
case nsXPTType::T_I8 :
return ConvertToPrimitive(cx, s, static_cast<int8_t*>(d));
case nsXPTType::T_I16 :
return ConvertToPrimitive(cx, s, static_cast<int16_t*>(d));
case nsXPTType::T_I32 :
return ConvertToPrimitive(cx, s, static_cast<int32_t*>(d));
case nsXPTType::T_I64 :
return ConvertToPrimitive(cx, s, static_cast<int64_t*>(d));
case nsXPTType::T_U8 :
return ConvertToPrimitive(cx, s, static_cast<uint8_t*>(d));
case nsXPTType::T_U16 :
return ConvertToPrimitive(cx, s, static_cast<uint16_t*>(d));
case nsXPTType::T_U32 :
return ConvertToPrimitive(cx, s, static_cast<uint32_t*>(d));
case nsXPTType::T_U64 :
return ConvertToPrimitive(cx, s, static_cast<uint64_t*>(d));
case nsXPTType::T_FLOAT :
return ConvertToPrimitive(cx, s, static_cast<float*>(d));
case nsXPTType::T_DOUBLE :
return ConvertToPrimitive(cx, s, static_cast<double*>(d));
case nsXPTType::T_BOOL :
return ConvertToPrimitive(cx, s, static_cast<bool*>(d));
case nsXPTType::T_CHAR :
{
JSString* str = ToString(cx, s);
if (!str) {
return false;
}
char16_t ch;
if (JS_GetStringLength(str) == 0) {
ch = 0;
} else {
if (!JS_GetStringCharAt(cx, str, 0, &ch))
return false;
}
#ifdef DEBUG
CheckChar16InCharRange(ch);
#endif
*((char*)d) = char(ch);
break;
}
case nsXPTType::T_WCHAR :
{
JSString* str;
if (!(str = ToString(cx, s))) {
return false;
}
size_t length = JS_GetStringLength(str);
if (length == 0) {
*((uint16_t*)d) = 0;
break;
}
char16_t ch;
if (!JS_GetStringCharAt(cx, str, 0, &ch))
return false;
*((uint16_t*)d) = uint16_t(ch);
break;
}
case nsXPTType::T_JSVAL :
*((Value*)d) = s;
break;
case nsXPTType::T_VOID:
XPC_LOG_ERROR(("XPCConvert::JSData2Native : void* params not supported"));
NS_ERROR("void* params not supported");
return false;
case nsXPTType::T_IID:
{
const nsID* pid = nullptr;
// There's no good reason to pass a null IID.
if (s.isNullOrUndefined()) {
if (pErr)
*pErr = NS_ERROR_XPC_BAD_CONVERT_JS;
return false;
}
if (!s.isObject() ||
(!(pid = xpc_JSObjectToID(cx, &s.toObject()))) ||
(!(pid = (const nsID*) nsMemory::Clone(pid, sizeof(nsID))))) {
return false;
}
*((const nsID**)d) = pid;
return true;
}
case nsXPTType::T_ASTRING:
{
if (s.isUndefined()) {
(**((nsAString**)d)).SetIsVoid(true);
return true;
}
// Fall through to T_DOMSTRING case.
}
case nsXPTType::T_DOMSTRING:
{
if (s.isNull()) {
(**((nsAString**)d)).SetIsVoid(true);
return true;
}
size_t length = 0;
JSString* str = nullptr;
if (!s.isUndefined()) {
str = ToString(cx, s);
if (!str)
return false;
length = JS_GetStringLength(str);
if (!length) {
(**((nsAString**)d)).Truncate();
return true;
}
}
nsAString* ws = *((nsAString**)d);
if (!str) {
ws->AssignLiteral(MOZ_UTF16("undefined"));
} else if (XPCStringConvert::IsDOMString(str)) {
// The characters represent an existing nsStringBuffer that
// was shared by XPCStringConvert::ReadableToJSVal.
const char16_t* chars = JS_GetTwoByteExternalStringChars(str);
nsStringBuffer::FromData((void*)chars)->ToString(length, *ws);
} else if (XPCStringConvert::IsLiteral(str)) {
// The characters represent a literal char16_t string constant
// compiled into libxul, such as the string "undefined" above.
const char16_t* chars = JS_GetTwoByteExternalStringChars(str);
ws->AssignLiteral(chars, length);
} else {
if (!AssignJSString(cx, *ws, str))
return false;
}
return true;
}
case nsXPTType::T_CHAR_STR:
{
if (s.isUndefined() || s.isNull()) {
*((char**)d) = nullptr;
return true;
}
JSString* str = ToString(cx, s);
if (!str) {
return false;
}
#ifdef DEBUG
if (JS_StringHasLatin1Chars(str)) {
size_t len;
AutoCheckCannotGC nogc;
const Latin1Char* chars = JS_GetLatin1StringCharsAndLength(cx, nogc, str, &len);
if (chars)
CheckCharsInCharRange(chars, len);
} else {
size_t len;
AutoCheckCannotGC nogc;
const char16_t* chars = JS_GetTwoByteStringCharsAndLength(cx, nogc, str, &len);
if (chars)
CheckCharsInCharRange(chars, len);
}
#endif // DEBUG
size_t length = JS_GetStringEncodingLength(cx, str);
if (length == size_t(-1)) {
return false;
}
char* buffer = static_cast<char*>(moz_xmalloc(length + 1));
if (!buffer) {
return false;
}
JS_EncodeStringToBuffer(cx, str, buffer, length);
buffer[length] = '\0';
*((void**)d) = buffer;
return true;
}
case nsXPTType::T_WCHAR_STR:
{
JSString* str;
if (s.isUndefined() || s.isNull()) {
*((char16_t**)d) = nullptr;
return true;
}
if (!(str = ToString(cx, s))) {
return false;
}
int len = JS_GetStringLength(str);
int byte_len = (len+1)*sizeof(char16_t);
if (!(*((void**)d) = moz_xmalloc(byte_len))) {
// XXX should report error
return false;
}
mozilla::Range<char16_t> destChars(*((char16_t**)d), len + 1);
if (!JS_CopyStringChars(cx, destChars, str))
return false;
destChars[len] = 0;
return true;
}
case nsXPTType::T_UTF8STRING:
{
if (s.isNull() || s.isUndefined()) {
nsCString* rs = *((nsCString**)d);
rs->SetIsVoid(true);
return true;
}
// The JS val is neither null nor void...
JSString* str = ToString(cx, s);
if (!str)
return false;
size_t length = JS_GetStringLength(str);
if (!length) {
nsCString* rs = *((nsCString**)d);
rs->Truncate();
return true;
}
JSFlatString* flat = JS_FlattenString(cx, str);
if (!flat)
return false;
size_t utf8Length = JS::GetDeflatedUTF8StringLength(flat);
nsACString* rs = *((nsACString**)d);
rs->SetLength(utf8Length);
JS::DeflateStringToUTF8Buffer(flat, mozilla::RangedPtr<char>(rs->BeginWriting(), utf8Length));
return true;
}
case nsXPTType::T_CSTRING:
{
if (s.isNull() || s.isUndefined()) {
nsACString* rs = *((nsACString**)d);
rs->Truncate();
rs->SetIsVoid(true);
return true;
}
// The JS val is neither null nor void...
JSString* str = ToString(cx, s);
if (!str) {
return false;
}
size_t length = JS_GetStringEncodingLength(cx, str);
if (length == size_t(-1)) {
return false;
}
if (!length) {
nsCString* rs = *((nsCString**)d);
rs->Truncate();
return true;
}
nsACString* rs = *((nsACString**)d);
rs->SetLength(uint32_t(length));
if (rs->Length() != uint32_t(length)) {
return false;
}
JS_EncodeStringToBuffer(cx, str, rs->BeginWriting(), length);
return true;
}
case nsXPTType::T_INTERFACE:
case nsXPTType::T_INTERFACE_IS:
{
MOZ_ASSERT(iid,"can't do interface conversions without iid");
if (iid->Equals(NS_GET_IID(nsIVariant))) {
nsCOMPtr<nsIVariant> variant = XPCVariant::newVariant(cx, s);
if (!variant)
return false;
variant.forget(static_cast<nsISupports**>(d));
return true;
} else if (iid->Equals(NS_GET_IID(nsIAtom)) && s.isString()) {
// We're trying to pass a string as an nsIAtom. Let's atomize!
JSString* str = s.toString();
nsAutoJSString autoStr;
if (!autoStr.init(cx, str)) {
if (pErr)
*pErr = NS_ERROR_XPC_BAD_CONVERT_JS_NULL_REF;
return false;
}
nsCOMPtr<nsIAtom> atom = NS_NewAtom(autoStr);
atom.forget((nsISupports**)d);
return true;
}
//else ...
if (s.isNullOrUndefined()) {
*((nsISupports**)d) = nullptr;
return true;
}
// only wrap JSObjects
if (!s.isObject()) {
if (pErr && s.isInt32() && 0 == s.toInt32())
*pErr = NS_ERROR_XPC_BAD_CONVERT_JS_ZERO_ISNOT_NULL;
return false;
}
RootedObject src(cx, &s.toObject());
return JSObject2NativeInterface((void**)d, src, iid, nullptr, pErr);
}
default:
NS_ERROR("bad type");
return false;
}
return true;
}
static inline bool
CreateHolderIfNeeded(HandleObject obj, MutableHandleValue d,
nsIXPConnectJSObjectHolder** dest)
{
if (dest) {
if (!obj)
return false;
RefPtr<XPCJSObjectHolder> objHolder = new XPCJSObjectHolder(obj);
objHolder.forget(dest);
}
d.setObjectOrNull(obj);
return true;
}
/***************************************************************************/
// static
bool
XPCConvert::NativeInterface2JSObject(MutableHandleValue d,
nsIXPConnectJSObjectHolder** dest,
xpcObjectHelper& aHelper,
const nsID* iid,
XPCNativeInterface** Interface,
bool allowNativeWrapper,
nsresult* pErr)
{
MOZ_ASSERT_IF(Interface, iid);
if (!iid)
iid = &NS_GET_IID(nsISupports);
d.setNull();
if (dest)
*dest = nullptr;
if (!aHelper.Object())
return true;
if (pErr)
*pErr = NS_ERROR_XPC_BAD_CONVERT_NATIVE;
// We used to have code here that unwrapped and simply exposed the
// underlying JSObject. That caused anomolies when JSComponents were
// accessed from other JS code - they didn't act like other xpconnect
// wrapped components. So, instead, we create "double wrapped" objects
// (that means an XPCWrappedNative around an nsXPCWrappedJS). This isn't
// optimal -- we could detect this and roll the functionality into a
// single wrapper, but the current solution is good enough for now.
AutoJSContext cx;
XPCWrappedNativeScope* xpcscope = ObjectScope(JS::CurrentGlobalOrNull(cx));
if (!xpcscope)
return false;
// First, see if this object supports the wrapper cache.
// Note: If |cache->IsDOMBinding()| is true, then it means that the object
// implementing it doesn't want a wrapped native as its JS Object, but
// instead it provides its own proxy object. In that case, the object
// to use is found as cache->GetWrapper(). If that is null, then the
// object will create (and fill the cache) from its WrapObject call.
nsWrapperCache* cache = aHelper.GetWrapperCache();
RootedObject flat(cx, cache ? cache->GetWrapper() : nullptr);
if (!flat && cache && cache->IsDOMBinding()) {
RootedObject global(cx, xpcscope->GetGlobalJSObject());
js::AssertSameCompartment(cx, global);
flat = cache->WrapObject(cx, nullptr);
if (!flat)
return false;
}
if (flat) {
if (allowNativeWrapper && !JS_WrapObject(cx, &flat))
return false;
return CreateHolderIfNeeded(flat, d, dest);
}
// Don't double wrap CPOWs. This is a temporary measure for compatibility
// with objects that don't provide necessary QIs (such as objects under
// the new DOM bindings). We expect the other side of the CPOW to have
// the appropriate wrappers in place.
RootedObject cpow(cx, UnwrapNativeCPOW(aHelper.Object()));
if (cpow) {
if (!JS_WrapObject(cx, &cpow))
return false;
d.setObject(*cpow);
return true;
}
// Go ahead and create an XPCWrappedNative for this object.
AutoMarkingNativeInterfacePtr iface(cx);
if (iid) {
if (Interface)
iface = *Interface;
if (!iface) {
iface = XPCNativeInterface::GetNewOrUsed(iid);
if (!iface)
return false;
if (Interface)
*Interface = iface;
}
}
RefPtr<XPCWrappedNative> wrapper;
nsresult rv = XPCWrappedNative::GetNewOrUsed(aHelper, xpcscope, iface,
getter_AddRefs(wrapper));
if (NS_FAILED(rv) && pErr)
*pErr = rv;
// If creating the wrapped native failed, then return early.
if (NS_FAILED(rv) || !wrapper)
return false;
// If we're not creating security wrappers, we can return the
// XPCWrappedNative as-is here.
flat = wrapper->GetFlatJSObject();
if (!allowNativeWrapper) {
d.setObjectOrNull(flat);
if (dest)
wrapper.forget(dest);
if (pErr)
*pErr = NS_OK;
return true;
}
// The call to wrap here handles both cross-compartment and same-compartment
// security wrappers.
RootedObject original(cx, flat);
if (!JS_WrapObject(cx, &flat))
return false;
d.setObjectOrNull(flat);
if (dest) {
// The wrapper still holds the original flat object.
if (flat == original) {
wrapper.forget(dest);
} else {
if (!flat)
return false;
RefPtr<XPCJSObjectHolder> objHolder = new XPCJSObjectHolder(flat);
objHolder.forget(dest);
}
}
if (pErr)
*pErr = NS_OK;
return true;
}
/***************************************************************************/
// static
bool
XPCConvert::JSObject2NativeInterface(void** dest, HandleObject src,
const nsID* iid,
nsISupports* aOuter,
nsresult* pErr)
{
MOZ_ASSERT(dest, "bad param");
MOZ_ASSERT(src, "bad param");
MOZ_ASSERT(iid, "bad param");
AutoJSContext cx;
JSAutoCompartment ac(cx, src);
*dest = nullptr;
if (pErr)
*pErr = NS_ERROR_XPC_BAD_CONVERT_JS;
nsISupports* iface;
if (!aOuter) {
// Note that if we have a non-null aOuter then it means that we are
// forcing the creation of a wrapper even if the object *is* a
// wrappedNative or other wise has 'nsISupportness'.
// This allows wrapJSAggregatedToNative to work.
// If we're looking at a security wrapper, see now if we're allowed to
// pass it to C++. If we are, then fall through to the code below. If
// we aren't, throw an exception eagerly.
//
// NB: It's very important that we _don't_ unwrap in the aOuter case,
// because the caller may explicitly want to create the XPCWrappedJS
// around a security wrapper. XBL does this with Xrays from the XBL
// scope - see nsBindingManager::GetBindingImplementation.
JSObject* inner = js::CheckedUnwrap(src, /* stopAtWindowProxy = */ false);
if (!inner) {
if (pErr)
*pErr = NS_ERROR_XPC_SECURITY_MANAGER_VETO;
return false;
}
// Is this really a native xpcom object with a wrapper?
XPCWrappedNative* wrappedNative = nullptr;
if (IS_WN_REFLECTOR(inner))
wrappedNative = XPCWrappedNative::Get(inner);
if (wrappedNative) {
iface = wrappedNative->GetIdentityObject();
return NS_SUCCEEDED(iface->QueryInterface(*iid, dest));
}
// else...
// Deal with slim wrappers here.
if (GetISupportsFromJSObject(inner ? inner : src, &iface)) {
return iface && NS_SUCCEEDED(iface->QueryInterface(*iid, dest));
}
}
RefPtr<nsXPCWrappedJS> wrapper;
nsresult rv = nsXPCWrappedJS::GetNewOrUsed(src, *iid, getter_AddRefs(wrapper));
if (pErr)
*pErr = rv;
if (NS_FAILED(rv) || !wrapper)
return false;
// If the caller wanted to aggregate this JS object to a native,
// attach it to the wrapper. Note that we allow a maximum of one
// aggregated native for a given XPCWrappedJS.
if (aOuter)
wrapper->SetAggregatedNativeObject(aOuter);
// We need to go through the QueryInterface logic to make this return
// the right thing for the various 'special' interfaces; e.g.
// nsIPropertyBag. We must use AggregatedQueryInterface in cases where
// there is an outer to avoid nasty recursion.
rv = aOuter ? wrapper->AggregatedQueryInterface(*iid, dest) :
wrapper->QueryInterface(*iid, dest);
if (pErr)
*pErr = rv;
return NS_SUCCEEDED(rv);
}
/***************************************************************************/
/***************************************************************************/
// static
nsresult
XPCConvert::ConstructException(nsresult rv, const char* message,
const char* ifaceName, const char* methodName,
nsISupports* data,
nsIException** exceptn,
JSContext* cx,
Value* jsExceptionPtr)
{
MOZ_ASSERT(!cx == !jsExceptionPtr, "Expected cx and jsExceptionPtr to cooccur.");
static const char format[] = "\'%s\' when calling method: [%s::%s]";
const char * msg = message;
nsXPIDLString xmsg;
nsAutoCString sxmsg;
nsCOMPtr<nsIScriptError> errorObject = do_QueryInterface(data);
if (errorObject) {
if (NS_SUCCEEDED(errorObject->GetMessageMoz(getter_Copies(xmsg)))) {
CopyUTF16toUTF8(xmsg, sxmsg);
msg = sxmsg.get();
}
}
if (!msg)
if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &msg) || ! msg)
msg = "<error>";
nsCString msgStr(msg);
if (ifaceName && methodName)
msgStr.AppendPrintf(format, msg, ifaceName, methodName);
RefPtr<Exception> e = new Exception(msgStr, rv, EmptyCString(), nullptr, data);
if (cx && jsExceptionPtr) {
e->StowJSVal(*jsExceptionPtr);
}
e.forget(exceptn);
return NS_OK;
}
/********************************/
class MOZ_STACK_CLASS AutoExceptionRestorer
{
public:
AutoExceptionRestorer(JSContext* cx, Value v)
: mContext(cx), tvr(cx, v)
{
JS_ClearPendingException(mContext);
}
~AutoExceptionRestorer()
{
JS_SetPendingException(mContext, tvr);
}
private:
JSContext * const mContext;
RootedValue tvr;
};
// static
nsresult
XPCConvert::JSValToXPCException(MutableHandleValue s,
const char* ifaceName,
const char* methodName,
nsIException** exceptn)
{
AutoJSContext cx;
AutoExceptionRestorer aer(cx, s);
if (!s.isPrimitive()) {
// we have a JSObject
RootedObject obj(cx, s.toObjectOrNull());
if (!obj) {
NS_ERROR("when is an object not an object?");
return NS_ERROR_FAILURE;
}
// is this really a native xpcom object with a wrapper?
JSObject* unwrapped = js::CheckedUnwrap(obj, /* stopAtWindowProxy = */ false);
if (!unwrapped)
return NS_ERROR_XPC_SECURITY_MANAGER_VETO;
XPCWrappedNative* wrapper = IS_WN_REFLECTOR(unwrapped) ? XPCWrappedNative::Get(unwrapped)
: nullptr;
if (wrapper) {
nsISupports* supports = wrapper->GetIdentityObject();
nsCOMPtr<nsIException> iface = do_QueryInterface(supports);
if (iface) {
// just pass through the exception (with extra ref and all)
nsCOMPtr<nsIException> temp = iface;
temp.forget(exceptn);
return NS_OK;
} else {
// it is a wrapped native, but not an exception!
return ConstructException(NS_ERROR_XPC_JS_THREW_NATIVE_OBJECT,
nullptr, ifaceName, methodName, supports,
exceptn, nullptr, nullptr);
}
} else {
// It is a JSObject, but not a wrapped native...
// If it is an engine Error with an error report then let's
// extract the report and build an xpcexception from that
const JSErrorReport* report;
if (nullptr != (report = JS_ErrorFromException(cx, obj))) {
JSAutoByteString message;
JSString* str;
if (nullptr != (str = ToString(cx, s)))
message.encodeLatin1(cx, str);
return JSErrorToXPCException(message.ptr(), ifaceName,
methodName, report, exceptn);
}
bool found;
// heuristic to see if it might be usable as an xpcexception
if (!JS_HasProperty(cx, obj, "message", &found))
return NS_ERROR_FAILURE;
if (found && !JS_HasProperty(cx, obj, "result", &found))
return NS_ERROR_FAILURE;
if (found) {
// lets try to build a wrapper around the JSObject
nsXPCWrappedJS* jswrapper;
nsresult rv =
nsXPCWrappedJS::GetNewOrUsed(obj, NS_GET_IID(nsIException), &jswrapper);
if (NS_FAILED(rv))
return rv;
*exceptn = static_cast<nsIException*>(jswrapper->GetXPTCStub());
return NS_OK;
}
// XXX we should do a check against 'js_ErrorClass' here and
// do the right thing - even though it has no JSErrorReport,
// The fact that it is a JSError exceptions means we can extract
// particular info and our 'result' should reflect that.
// otherwise we'll just try to convert it to a string
JSString* str = ToString(cx, s);
if (!str)
return NS_ERROR_FAILURE;
JSAutoByteString strBytes(cx, str);
if (!strBytes)
return NS_ERROR_FAILURE;
return ConstructException(NS_ERROR_XPC_JS_THREW_JS_OBJECT,
strBytes.ptr(), ifaceName, methodName,
nullptr, exceptn, cx, s.address());
}
}
if (s.isUndefined() || s.isNull()) {
return ConstructException(NS_ERROR_XPC_JS_THREW_NULL,
nullptr, ifaceName, methodName, nullptr,
exceptn, cx, s.address());
}
if (s.isNumber()) {
// lets see if it looks like an nsresult
nsresult rv;
double number;
bool isResult = false;
if (s.isInt32()) {
rv = (nsresult) s.toInt32();
if (NS_FAILED(rv))
isResult = true;
else
number = (double) s.toInt32();
} else {
number = s.toDouble();
if (number > 0.0 &&
number < (double)0xffffffff &&
0.0 == fmod(number,1)) {
// Visual Studio 9 doesn't allow casting directly from a
// double to an enumeration type, contrary to 5.2.9(10) of
// C++11, so add an intermediate cast.
rv = (nsresult)(uint32_t) number;
if (NS_FAILED(rv))
isResult = true;
}
}
if (isResult)
return ConstructException(rv, nullptr, ifaceName, methodName,
nullptr, exceptn, cx, s.address());
else {
// XXX all this nsISupportsDouble code seems a little redundant
// now that we're storing the Value in the exception...
nsCOMPtr<nsISupportsDouble> data;
nsCOMPtr<nsIComponentManager> cm;
if (NS_FAILED(NS_GetComponentManager(getter_AddRefs(cm))) || !cm ||
NS_FAILED(cm->CreateInstanceByContractID(NS_SUPPORTS_DOUBLE_CONTRACTID,
nullptr,
NS_GET_IID(nsISupportsDouble),
getter_AddRefs(data))))
return NS_ERROR_FAILURE;
data->SetData(number);
rv = ConstructException(NS_ERROR_XPC_JS_THREW_NUMBER, nullptr,
ifaceName, methodName, data, exceptn, cx, s.address());
return rv;
}
}
// otherwise we'll just try to convert it to a string
// Note: e.g., bools get converted to JSStrings by this code.
JSString* str = ToString(cx, s);
if (str) {
JSAutoByteString strBytes(cx, str);
if (!!strBytes) {
return ConstructException(NS_ERROR_XPC_JS_THREW_STRING,
strBytes.ptr(), ifaceName, methodName,
nullptr, exceptn, cx, s.address());
}
}
return NS_ERROR_FAILURE;
}
/********************************/
// static
nsresult
XPCConvert::JSErrorToXPCException(const char* message,
const char* ifaceName,
const char* methodName,
const JSErrorReport* report,
nsIException** exceptn)
{
AutoJSContext cx;
nsresult rv = NS_ERROR_FAILURE;
RefPtr<nsScriptError> data;
if (report) {
nsAutoString bestMessage;
if (report && report->ucmessage) {
bestMessage = static_cast<const char16_t*>(report->ucmessage);
} else if (message) {
CopyASCIItoUTF16(message, bestMessage);
} else {
bestMessage.AssignLiteral("JavaScript Error");
}
const char16_t* linebuf = report->linebuf();
data = new nsScriptError();
data->InitWithWindowID(
bestMessage,
NS_ConvertASCIItoUTF16(report->filename),
linebuf ? nsDependentString(linebuf, report->linebufLength()) : EmptyString(),
report->lineno,
report->tokenOffset(), report->flags,
NS_LITERAL_CSTRING("XPConnect JavaScript"),
nsJSUtils::GetCurrentlyRunningCodeInnerWindowID(cx));
}
if (data) {
nsAutoCString formattedMsg;
data->ToString(formattedMsg);
rv = ConstructException(NS_ERROR_XPC_JAVASCRIPT_ERROR_WITH_DETAILS,
formattedMsg.get(), ifaceName, methodName,
static_cast<nsIScriptError*>(data.get()),
exceptn, nullptr, nullptr);
} else {
rv = ConstructException(NS_ERROR_XPC_JAVASCRIPT_ERROR,
nullptr, ifaceName, methodName, nullptr,
exceptn, nullptr, nullptr);
}
return rv;
}
/***************************************************************************/
// array fun...
#ifdef POPULATE
#undef POPULATE
#endif
// static
bool
XPCConvert::NativeArray2JS(MutableHandleValue d, const void** s,
const nsXPTType& type, const nsID* iid,
uint32_t count, nsresult* pErr)
{
NS_PRECONDITION(s, "bad param");
AutoJSContext cx;
// XXX add support for putting chars in a string rather than an array
// XXX add support to indicate *which* array element was not convertable
RootedObject array(cx, JS_NewArrayObject(cx, count));
if (!array)
return false;
if (pErr)
*pErr = NS_ERROR_XPC_BAD_CONVERT_NATIVE;
uint32_t i;
RootedValue current(cx, JS::NullValue());
#define POPULATE(_t) \
PR_BEGIN_MACRO \
for (i = 0; i < count; i++) { \
if (!NativeData2JS(&current, ((_t*)*s)+i, type, iid, pErr) || \
!JS_DefineElement(cx, array, i, current, JSPROP_ENUMERATE)) \
return false; \
} \
PR_END_MACRO
// XXX check IsPtr - esp. to handle array of nsID (as opposed to nsID*)
switch (type.TagPart()) {
case nsXPTType::T_I8 : POPULATE(int8_t); break;
case nsXPTType::T_I16 : POPULATE(int16_t); break;
case nsXPTType::T_I32 : POPULATE(int32_t); break;
case nsXPTType::T_I64 : POPULATE(int64_t); break;
case nsXPTType::T_U8 : POPULATE(uint8_t); break;
case nsXPTType::T_U16 : POPULATE(uint16_t); break;
case nsXPTType::T_U32 : POPULATE(uint32_t); break;
case nsXPTType::T_U64 : POPULATE(uint64_t); break;
case nsXPTType::T_FLOAT : POPULATE(float); break;
case nsXPTType::T_DOUBLE : POPULATE(double); break;
case nsXPTType::T_BOOL : POPULATE(bool); break;
case nsXPTType::T_CHAR : POPULATE(char); break;
case nsXPTType::T_WCHAR : POPULATE(char16_t); break;
case nsXPTType::T_VOID : NS_ERROR("bad type"); return false;
case nsXPTType::T_IID : POPULATE(nsID*); break;
case nsXPTType::T_DOMSTRING : NS_ERROR("bad type"); return false;
case nsXPTType::T_CHAR_STR : POPULATE(char*); break;
case nsXPTType::T_WCHAR_STR : POPULATE(char16_t*); break;
case nsXPTType::T_INTERFACE : POPULATE(nsISupports*); break;
case nsXPTType::T_INTERFACE_IS : POPULATE(nsISupports*); break;
case nsXPTType::T_UTF8STRING : NS_ERROR("bad type"); return false;
case nsXPTType::T_CSTRING : NS_ERROR("bad type"); return false;
case nsXPTType::T_ASTRING : NS_ERROR("bad type"); return false;
default : NS_ERROR("bad type"); return false;
}
if (pErr)
*pErr = NS_OK;
d.setObject(*array);
return true;
#undef POPULATE
}
// Check that the tag part of the type matches the type
// of the array. If the check succeeds, check that the size
// of the output does not exceed UINT32_MAX bytes. Allocate
// the memory and copy the elements by memcpy.
static bool
CheckTargetAndPopulate(const nsXPTType& type,
uint8_t requiredType,
size_t typeSize,
uint32_t count,
JSObject* tArr,
void** output,
nsresult* pErr)
{
// Check that the element type expected by the interface matches
// the type of the elements in the typed array exactly, including
// signedness.
if (type.TagPart() != requiredType) {
if (pErr)
*pErr = NS_ERROR_XPC_BAD_CONVERT_JS;
return false;
}
// Calulate the maximum number of elements that can fit in
// UINT32_MAX bytes.
size_t max = UINT32_MAX / typeSize;
// This could overflow on 32-bit systems so check max first.
size_t byteSize = count * typeSize;
if (count > max || !(*output = moz_xmalloc(byteSize))) {
if (pErr)
*pErr = NS_ERROR_OUT_OF_MEMORY;
return false;
}
JS::AutoCheckCannotGC nogc;
bool isShared;
void* buf = JS_GetArrayBufferViewData(tArr, &isShared, nogc);
// Require opting in to shared memory - a future project.
if (isShared) {
if (pErr)
*pErr = NS_ERROR_XPC_BAD_CONVERT_JS;
return false;
}
memcpy(*output, buf, byteSize);
return true;
}
// Fast conversion of typed arrays to native using memcpy.
// No float or double canonicalization is done. Called by
// JSarray2Native whenever a TypedArray is met. ArrayBuffers
// are not accepted; create a properly typed array view on them
// first. The element type of array must match the XPCOM
// type in size, type and signedness exactly. As an exception,
// Uint8ClampedArray is allowed for arrays of uint8_t. DataViews
// are not supported.
// static
bool
XPCConvert::JSTypedArray2Native(void** d,
JSObject* jsArray,
uint32_t count,
const nsXPTType& type,
nsresult* pErr)
{
MOZ_ASSERT(jsArray, "bad param");
MOZ_ASSERT(d, "bad param");
MOZ_ASSERT(JS_IsTypedArrayObject(jsArray), "not a typed array");
// Check the actual length of the input array against the
// given size_is.
uint32_t len = JS_GetTypedArrayLength(jsArray);
if (len < count) {
if (pErr)
*pErr = NS_ERROR_XPC_NOT_ENOUGH_ELEMENTS_IN_ARRAY;
return false;
}
void* output = nullptr;
switch (JS_GetArrayBufferViewType(jsArray)) {
case js::Scalar::Int8:
if (!CheckTargetAndPopulate(nsXPTType::T_I8, type,
sizeof(int8_t), count,
jsArray, &output, pErr)) {
return false;
}
break;
case js::Scalar::Uint8:
case js::Scalar::Uint8Clamped:
if (!CheckTargetAndPopulate(nsXPTType::T_U8, type,
sizeof(uint8_t), count,
jsArray, &output, pErr)) {
return false;
}
break;
case js::Scalar::Int16:
if (!CheckTargetAndPopulate(nsXPTType::T_I16, type,
sizeof(int16_t), count,
jsArray, &output, pErr)) {
return false;
}
break;
case js::Scalar::Uint16:
if (!CheckTargetAndPopulate(nsXPTType::T_U16, type,
sizeof(uint16_t), count,
jsArray, &output, pErr)) {
return false;
}
break;
case js::Scalar::Int32:
if (!CheckTargetAndPopulate(nsXPTType::T_I32, type,
sizeof(int32_t), count,
jsArray, &output, pErr)) {
return false;
}
break;
case js::Scalar::Uint32:
if (!CheckTargetAndPopulate(nsXPTType::T_U32, type,
sizeof(uint32_t), count,
jsArray, &output, pErr)) {
return false;
}
break;
case js::Scalar::Float32:
if (!CheckTargetAndPopulate(nsXPTType::T_FLOAT, type,
sizeof(float), count,
jsArray, &output, pErr)) {
return false;
}
break;
case js::Scalar::Float64:
if (!CheckTargetAndPopulate(nsXPTType::T_DOUBLE, type,
sizeof(double), count,
jsArray, &output, pErr)) {
return false;
}
break;
// Yet another array type was defined? It is not supported yet...
default:
if (pErr)
*pErr = NS_ERROR_XPC_BAD_CONVERT_JS;
return false;
}
*d = output;
if (pErr)
*pErr = NS_OK;
return true;
}
// static
bool
XPCConvert::JSArray2Native(void** d, HandleValue s,
uint32_t count, const nsXPTType& type,
const nsID* iid, nsresult* pErr)
{
MOZ_ASSERT(d, "bad param");
AutoJSContext cx;
// XXX add support for getting chars from strings
// XXX add support to indicate *which* array element was not convertable
if (s.isNullOrUndefined()) {
if (0 != count) {
if (pErr)
*pErr = NS_ERROR_XPC_NOT_ENOUGH_ELEMENTS_IN_ARRAY;
return false;
}
*d = nullptr;
return true;
}
if (!s.isObject()) {
if (pErr)
*pErr = NS_ERROR_XPC_CANT_CONVERT_PRIMITIVE_TO_ARRAY;
return false;
}
RootedObject jsarray(cx, &s.toObject());
// If this is a typed array, then try a fast conversion with memcpy.
if (JS_IsTypedArrayObject(jsarray)) {
return JSTypedArray2Native(d, jsarray, count, type, pErr);
}
bool isArray;
if (!JS_IsArrayObject(cx, jsarray, &isArray) || !isArray) {
if (pErr)
*pErr = NS_ERROR_XPC_CANT_CONVERT_OBJECT_TO_ARRAY;
return false;
}
uint32_t len;
if (!JS_GetArrayLength(cx, jsarray, &len) || len < count) {
if (pErr)
*pErr = NS_ERROR_XPC_NOT_ENOUGH_ELEMENTS_IN_ARRAY;
return false;
}
if (pErr)
*pErr = NS_ERROR_XPC_BAD_CONVERT_JS;
#define POPULATE(_mode, _t) \
PR_BEGIN_MACRO \
cleanupMode = _mode; \
size_t max = UINT32_MAX / sizeof(_t); \
if (count > max || \
nullptr == (array = moz_xmalloc(count * sizeof(_t)))) { \
if (pErr) \
*pErr = NS_ERROR_OUT_OF_MEMORY; \
goto failure; \
} \
for (initedCount = 0; initedCount < count; initedCount++) { \
if (!JS_GetElement(cx, jsarray, initedCount, &current) || \
!JSData2Native(((_t*)array)+initedCount, current, type, \
iid, pErr)) \
goto failure; \
} \
PR_END_MACRO
// No Action, FRee memory, RElease object
enum CleanupMode {na, fr, re};
CleanupMode cleanupMode;
void* array = nullptr;
uint32_t initedCount;
RootedValue current(cx);
// XXX check IsPtr - esp. to handle array of nsID (as opposed to nsID*)
// XXX make extra space at end of char* and wchar* and null termintate
switch (type.TagPart()) {
case nsXPTType::T_I8 : POPULATE(na, int8_t); break;
case nsXPTType::T_I16 : POPULATE(na, int16_t); break;
case nsXPTType::T_I32 : POPULATE(na, int32_t); break;
case nsXPTType::T_I64 : POPULATE(na, int64_t); break;
case nsXPTType::T_U8 : POPULATE(na, uint8_t); break;
case nsXPTType::T_U16 : POPULATE(na, uint16_t); break;
case nsXPTType::T_U32 : POPULATE(na, uint32_t); break;
case nsXPTType::T_U64 : POPULATE(na, uint64_t); break;
case nsXPTType::T_FLOAT : POPULATE(na, float); break;
case nsXPTType::T_DOUBLE : POPULATE(na, double); break;
case nsXPTType::T_BOOL : POPULATE(na, bool); break;
case nsXPTType::T_CHAR : POPULATE(na, char); break;
case nsXPTType::T_WCHAR : POPULATE(na, char16_t); break;
case nsXPTType::T_VOID : NS_ERROR("bad type"); goto failure;
case nsXPTType::T_IID : POPULATE(fr, nsID*); break;
case nsXPTType::T_DOMSTRING : NS_ERROR("bad type"); goto failure;
case nsXPTType::T_CHAR_STR : POPULATE(fr, char*); break;
case nsXPTType::T_WCHAR_STR : POPULATE(fr, char16_t*); break;
case nsXPTType::T_INTERFACE : POPULATE(re, nsISupports*); break;
case nsXPTType::T_INTERFACE_IS : POPULATE(re, nsISupports*); break;
case nsXPTType::T_UTF8STRING : NS_ERROR("bad type"); goto failure;
case nsXPTType::T_CSTRING : NS_ERROR("bad type"); goto failure;
case nsXPTType::T_ASTRING : NS_ERROR("bad type"); goto failure;
default : NS_ERROR("bad type"); goto failure;
}
*d = array;
if (pErr)
*pErr = NS_OK;
return true;
failure:
// we may need to cleanup the partially filled array of converted stuff
if (array) {
if (cleanupMode == re) {
nsISupports** a = (nsISupports**) array;
for (uint32_t i = 0; i < initedCount; i++) {
nsISupports* p = a[i];
NS_IF_RELEASE(p);
}
} else if (cleanupMode == fr) {
void** a = (void**) array;
for (uint32_t i = 0; i < initedCount; i++) {
void* p = a[i];
if (p) free(p);
}
}
free(array);
}
return false;
#undef POPULATE
}
// static
bool
XPCConvert::NativeStringWithSize2JS(MutableHandleValue d, const void* s,
const nsXPTType& type,
uint32_t count,
nsresult* pErr)
{
NS_PRECONDITION(s, "bad param");
AutoJSContext cx;
if (pErr)
*pErr = NS_ERROR_XPC_BAD_CONVERT_NATIVE;
switch (type.TagPart()) {
case nsXPTType::T_PSTRING_SIZE_IS:
{
char* p = *((char**)s);
if (!p)
break;
JSString* str;
if (!(str = JS_NewStringCopyN(cx, p, count)))
return false;
d.setString(str);
break;
}
case nsXPTType::T_PWSTRING_SIZE_IS:
{
char16_t* p = *((char16_t**)s);
if (!p)
break;
JSString* str;
if (!(str = JS_NewUCStringCopyN(cx, p, count)))
return false;
d.setString(str);
break;
}
default:
XPC_LOG_ERROR(("XPCConvert::NativeStringWithSize2JS : unsupported type"));
return false;
}
return true;
}
// static
bool
XPCConvert::JSStringWithSize2Native(void* d, HandleValue s,
uint32_t count, const nsXPTType& type,
nsresult* pErr)
{
NS_PRECONDITION(!s.isNull(), "bad param");
NS_PRECONDITION(d, "bad param");
AutoJSContext cx;
uint32_t len;
if (pErr)
*pErr = NS_ERROR_XPC_BAD_CONVERT_NATIVE;
switch (type.TagPart()) {
case nsXPTType::T_PSTRING_SIZE_IS:
{
if (s.isUndefined() || s.isNull()) {
if (0 != count) {
if (pErr)
*pErr = NS_ERROR_XPC_NOT_ENOUGH_CHARS_IN_STRING;
return false;
}
if (0 != count) {
len = (count + 1) * sizeof(char);
if (!(*((void**)d) = moz_xmalloc(len)))
return false;
return true;
}
// else ...
*((char**)d) = nullptr;
return true;
}
JSString* str = ToString(cx, s);
if (!str) {
return false;
}
size_t length = JS_GetStringEncodingLength(cx, str);
if (length == size_t(-1)) {
return false;
}
if (length > count) {
if (pErr)
*pErr = NS_ERROR_XPC_NOT_ENOUGH_CHARS_IN_STRING;
return false;
}
len = uint32_t(length);
if (len < count)
len = count;
uint32_t alloc_len = (len + 1) * sizeof(char);
char* buffer = static_cast<char*>(moz_xmalloc(alloc_len));
if (!buffer) {
return false;
}
JS_EncodeStringToBuffer(cx, str, buffer, len);
buffer[len] = '\0';
*((char**)d) = buffer;
return true;
}
case nsXPTType::T_PWSTRING_SIZE_IS:
{
JSString* str;
if (s.isUndefined() || s.isNull()) {
if (0 != count) {
if (pErr)
*pErr = NS_ERROR_XPC_NOT_ENOUGH_CHARS_IN_STRING;
return false;
}
if (0 != count) {
len = (count + 1) * sizeof(char16_t);
if (!(*((void**)d) = moz_xmalloc(len)))
return false;
return true;
}
// else ...
*((const char16_t**)d) = nullptr;
return true;
}
if (!(str = ToString(cx, s))) {
return false;
}
len = JS_GetStringLength(str);
if (len > count) {
if (pErr)
*pErr = NS_ERROR_XPC_NOT_ENOUGH_CHARS_IN_STRING;
return false;
}
len = count;
uint32_t alloc_len = (len + 1) * sizeof(char16_t);
if (!(*((void**)d) = moz_xmalloc(alloc_len))) {
// XXX should report error
return false;
}
mozilla::Range<char16_t> destChars(*((char16_t**)d), len + 1);
if (!JS_CopyStringChars(cx, destChars, str))
return false;
destChars[count] = 0;
return true;
}
default:
XPC_LOG_ERROR(("XPCConvert::JSStringWithSize2Native : unsupported type"));
return false;
}
}
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