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comparison: toolkit/components/ctypes/ctypes.cpp
toolkit/components/ctypes/ctypes.cpp
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "ctypes.h" | |
| 7 #include "jsapi.h" | |
| 8 #include "mozilla/ModuleUtils.h" | |
| 9 #include "nsMemory.h" | |
| 10 #include "nsString.h" | |
| 11 #include "nsNativeCharsetUtils.h" | |
| 12 #include "mozilla/Preferences.h" | |
| 13 #include "mozJSComponentLoader.h" | |
| 14 #include "nsZipArchive.h" | |
| 15 | |
| 16 #define JSCTYPES_CONTRACTID \ | |
| 17 "@mozilla.org/jsctypes;1" | |
| 18 | |
| 19 | |
| 20 #define JSCTYPES_CID \ | |
| 21 { 0xc797702, 0x1c60, 0x4051, { 0x9d, 0xd7, 0x4d, 0x74, 0x5, 0x60, 0x56, 0x42 } } | |
| 22 | |
| 23 namespace mozilla { | |
| 24 namespace ctypes { | |
| 25 | |
| 26 static char* | |
| 27 UnicodeToNative(JSContext *cx, const jschar *source, size_t slen) | |
| 28 { | |
| 29 nsAutoCString native; | |
| 30 nsDependentString unicode(reinterpret_cast<const char16_t*>(source), slen); | |
| 31 nsresult rv = NS_CopyUnicodeToNative(unicode, native); | |
| 32 if (NS_FAILED(rv)) { | |
| 33 JS_ReportError(cx, "could not convert string to native charset"); | |
| 34 return nullptr; | |
| 35 } | |
| 36 | |
| 37 char* result = static_cast<char*>(JS_malloc(cx, native.Length() + 1)); | |
| 38 if (!result) | |
| 39 return nullptr; | |
| 40 | |
| 41 memcpy(result, native.get(), native.Length() + 1); | |
| 42 return result; | |
| 43 } | |
| 44 | |
| 45 static JSCTypesCallbacks sCallbacks = { | |
| 46 UnicodeToNative | |
| 47 }; | |
| 48 | |
| 49 NS_GENERIC_FACTORY_CONSTRUCTOR(Module) | |
| 50 | |
| 51 NS_IMPL_ISUPPORTS(Module, nsIXPCScriptable) | |
| 52 | |
| 53 Module::Module() | |
| 54 { | |
| 55 } | |
| 56 | |
| 57 Module::~Module() | |
| 58 { | |
| 59 } | |
| 60 | |
| 61 #define XPC_MAP_CLASSNAME Module | |
| 62 #define XPC_MAP_QUOTED_CLASSNAME "Module" | |
| 63 #define XPC_MAP_WANT_CALL | |
| 64 #define XPC_MAP_FLAGS nsIXPCScriptable::WANT_CALL | |
| 65 #include "xpc_map_end.h" | |
| 66 | |
| 67 static bool | |
| 68 SealObjectAndPrototype(JSContext* cx, JS::Handle<JSObject *> parent, const char* name) | |
| 69 { | |
| 70 JS::Rooted<JS::Value> prop(cx); | |
| 71 if (!JS_GetProperty(cx, parent, name, &prop)) | |
| 72 return false; | |
| 73 | |
| 74 if (prop.isUndefined()) { | |
| 75 // Pretend we sealed the object. | |
| 76 return true; | |
| 77 } | |
| 78 | |
| 79 JS::Rooted<JSObject*> obj(cx, prop.toObjectOrNull()); | |
| 80 if (!JS_GetProperty(cx, obj, "prototype", &prop)) | |
| 81 return false; | |
| 82 | |
| 83 JS::Rooted<JSObject*> prototype(cx, prop.toObjectOrNull()); | |
| 84 return JS_FreezeObject(cx, obj) && JS_FreezeObject(cx, prototype); | |
| 85 } | |
| 86 | |
| 87 static bool | |
| 88 InitAndSealCTypesClass(JSContext* cx, JS::Handle<JSObject*> global) | |
| 89 { | |
| 90 // Init the ctypes object. | |
| 91 if (!JS_InitCTypesClass(cx, global)) | |
| 92 return false; | |
| 93 | |
| 94 // Set callbacks for charset conversion and such. | |
| 95 JS::Rooted<JS::Value> ctypes(cx); | |
| 96 if (!JS_GetProperty(cx, global, "ctypes", &ctypes)) | |
| 97 return false; | |
| 98 | |
| 99 JS_SetCTypesCallbacks(JSVAL_TO_OBJECT(ctypes), &sCallbacks); | |
| 100 | |
| 101 // Seal up Object, Function, Array and Error and their prototypes. (This | |
| 102 // single object instance is shared amongst everyone who imports the ctypes | |
| 103 // module.) | |
| 104 if (!SealObjectAndPrototype(cx, global, "Object") || | |
| 105 !SealObjectAndPrototype(cx, global, "Function") || | |
| 106 !SealObjectAndPrototype(cx, global, "Array") || | |
| 107 !SealObjectAndPrototype(cx, global, "Error")) | |
| 108 return false; | |
| 109 | |
| 110 // Finally, seal the global object, for good measure. (But not recursively; | |
| 111 // this breaks things.) | |
| 112 return JS_FreezeObject(cx, global); | |
| 113 } | |
| 114 | |
| 115 NS_IMETHODIMP | |
| 116 Module::Call(nsIXPConnectWrappedNative* wrapper, | |
| 117 JSContext* cx, | |
| 118 JSObject* obj, | |
| 119 const JS::CallArgs& args, | |
| 120 bool* _retval) | |
| 121 { | |
| 122 mozJSComponentLoader* loader = mozJSComponentLoader::Get(); | |
| 123 JS::Rooted<JSObject*> targetObj(cx); | |
| 124 nsresult rv = loader->FindTargetObject(cx, &targetObj); | |
| 125 NS_ENSURE_SUCCESS(rv, rv); | |
| 126 | |
| 127 *_retval = InitAndSealCTypesClass(cx, targetObj); | |
| 128 return NS_OK; | |
| 129 } | |
| 130 | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 NS_DEFINE_NAMED_CID(JSCTYPES_CID); | |
| 135 | |
| 136 static const mozilla::Module::CIDEntry kCTypesCIDs[] = { | |
| 137 { &kJSCTYPES_CID, false, nullptr, mozilla::ctypes::ModuleConstructor }, | |
| 138 { nullptr } | |
| 139 }; | |
| 140 | |
| 141 static const mozilla::Module::ContractIDEntry kCTypesContracts[] = { | |
| 142 { JSCTYPES_CONTRACTID, &kJSCTYPES_CID }, | |
| 143 { nullptr } | |
| 144 }; | |
| 145 | |
| 146 static const mozilla::Module kCTypesModule = { | |
| 147 mozilla::Module::kVersion, | |
| 148 kCTypesCIDs, | |
| 149 kCTypesContracts | |
| 150 }; | |
| 151 | |
| 152 NSMODULE_DEFN(jsctypes) = &kCTypesModule; |
