1 /*
2 * Copyright (C) 2009 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #ifndef V8ArrayBufferViewCustom_h
32 #define V8ArrayBufferViewCustom_h
33
34 #include "ArrayBuffer.h"
35
36 #include "V8ArrayBuffer.h"
37 #include "V8Binding.h"
38 #include "V8Proxy.h"
39
40 namespace WebCore {
41
42 // Template function used by the ArrayBufferView*Constructor callbacks.
43 template<class ArrayClass, class ElementType>
constructWebGLArrayWithArrayBufferArgument(const v8::Arguments & args,WrapperTypeInfo * type,v8::ExternalArrayType arrayType,bool hasIndexer)44 v8::Handle<v8::Value> constructWebGLArrayWithArrayBufferArgument(const v8::Arguments& args, WrapperTypeInfo* type, v8::ExternalArrayType arrayType, bool hasIndexer)
45 {
46 ArrayBuffer* buf = V8ArrayBuffer::toNative(args[0]->ToObject());
47 if (!buf)
48 return throwError("Could not convert argument 0 to a ArrayBuffer");
49 bool ok;
50 uint32_t offset = 0;
51 int argLen = args.Length();
52 if (argLen > 1) {
53 offset = toUInt32(args[1], ok);
54 if (!ok)
55 return throwError("Could not convert argument 1 to a number");
56 }
57 if ((buf->byteLength() - offset) % sizeof(ElementType))
58 return throwError("ArrayBuffer length minus the byteOffset is not a multiple of the element size.", V8Proxy::RangeError);
59 uint32_t length = (buf->byteLength() - offset) / sizeof(ElementType);
60 if (argLen > 2) {
61 length = toUInt32(args[2], ok);
62 if (!ok)
63 return throwError("Could not convert argument 2 to a number");
64 }
65
66 RefPtr<ArrayClass> array = ArrayClass::create(buf, offset, length);
67 if (!array) {
68 V8Proxy::setDOMException(INDEX_SIZE_ERR);
69 return notHandledByInterceptor();
70 }
71 // Transform the holder into a wrapper object for the array.
72 V8DOMWrapper::setDOMWrapper(args.Holder(), type, array.get());
73 if (hasIndexer)
74 args.Holder()->SetIndexedPropertiesToExternalArrayData(array.get()->baseAddress(), arrayType, array.get()->length());
75 return toV8(array.release(), args.Holder());
76 }
77
78 // Template function used by the ArrayBufferView*Constructor callbacks.
79 template<class ArrayClass, class ElementType>
constructWebGLArray(const v8::Arguments & args,WrapperTypeInfo * type,v8::ExternalArrayType arrayType)80 v8::Handle<v8::Value> constructWebGLArray(const v8::Arguments& args, WrapperTypeInfo* type, v8::ExternalArrayType arrayType)
81 {
82 if (!args.IsConstructCall())
83 return throwError("DOM object constructor cannot be called as a function.");
84
85 int argLen = args.Length();
86 if (!argLen) {
87 // This happens when we return a previously constructed
88 // ArrayBufferView, e.g. from the call to <Type>Array.subset().
89 // The V8DOMWrapper will set the internal pointer in the
90 // created object. Unfortunately it doesn't look like it's
91 // possible to distinguish between this case and that where
92 // the user calls "new <Type>Array()" from JavaScript. We must
93 // construct an empty view to avoid crashes when fetching the
94 // length.
95 RefPtr<ArrayClass> array = ArrayClass::create(0);
96 // Transform the holder into a wrapper object for the array.
97 V8DOMWrapper::setDOMWrapper(args.Holder(), type, array.get());
98 // Do not call SetIndexedPropertiesToExternalArrayData on this
99 // object. Not only is there no point from a performance
100 // perspective, but doing so causes errors in the subset() case.
101 return toV8(array.release(), args.Holder());
102 }
103
104 // Supported constructors:
105 // WebGL<T>Array(n) where n is an integer:
106 // -- create an empty array of n elements
107 // WebGL<T>Array(arr) where arr is an array:
108 // -- create a WebGL<T>Array containing the contents of "arr"
109 // WebGL<T>Array(buf, offset, length)
110 // -- create a WebGL<T>Array pointing to the ArrayBuffer
111 // "buf", starting at the specified offset, for the given
112 // length
113
114 if (args[0]->IsNull()) {
115 // Invalid first argument
116 // FIXME: use forthcoming V8Proxy::throwTypeError().
117 return V8Proxy::throwError(V8Proxy::TypeError, "Type error");
118 }
119
120 // See whether the first argument is a ArrayBuffer.
121 if (V8ArrayBuffer::HasInstance(args[0]))
122 return constructWebGLArrayWithArrayBufferArgument<ArrayClass, ElementType>(args, type, arrayType, true);
123
124 uint32_t len = 0;
125 v8::Handle<v8::Object> srcArray;
126 bool doInstantiation = false;
127
128 if (args[0]->IsObject()) {
129 srcArray = args[0]->ToObject();
130 if (srcArray.IsEmpty())
131 return throwError("Could not convert argument 0 to an array");
132 len = toUInt32(srcArray->Get(v8::String::New("length")));
133 doInstantiation = true;
134 } else {
135 bool ok = false;
136 int32_t tempLength = toInt32(args[0], ok); // NaN/+inf/-inf returns 0, this is intended by WebIDL
137 if (ok && tempLength >= 0) {
138 len = static_cast<uint32_t>(tempLength);
139 doInstantiation = true;
140 }
141 }
142
143 RefPtr<ArrayClass> array;
144 if (doInstantiation)
145 array = ArrayClass::create(len);
146 if (!array.get())
147 return throwError("ArrayBufferView size is not a small enough positive integer.", V8Proxy::RangeError);
148
149 if (!srcArray.IsEmpty()) {
150 // Need to copy the incoming array into the newly created ArrayBufferView.
151 for (unsigned i = 0; i < len; i++) {
152 v8::Local<v8::Value> val = srcArray->Get(v8::Integer::NewFromUnsigned(i));
153 array->set(i, val->NumberValue());
154 }
155 }
156
157 // Transform the holder into a wrapper object for the array.
158 V8DOMWrapper::setDOMWrapper(args.Holder(), type, array.get());
159 args.Holder()->SetIndexedPropertiesToExternalArrayData(array.get()->baseAddress(), arrayType, array.get()->length());
160 return toV8(array.release(), args.Holder());
161 }
162
163 template <class CPlusPlusArrayType, class JavaScriptWrapperArrayType>
setWebGLArrayHelper(const v8::Arguments & args)164 v8::Handle<v8::Value> setWebGLArrayHelper(const v8::Arguments& args)
165 {
166 if (args.Length() < 1) {
167 V8Proxy::setDOMException(SYNTAX_ERR);
168 return notHandledByInterceptor();
169 }
170
171 CPlusPlusArrayType* impl = JavaScriptWrapperArrayType::toNative(args.Holder());
172
173 if (JavaScriptWrapperArrayType::HasInstance(args[0])) {
174 // void set(in WebGL<T>Array array, [Optional] in unsigned long offset);
175 CPlusPlusArrayType* src = JavaScriptWrapperArrayType::toNative(args[0]->ToObject());
176 uint32_t offset = 0;
177 if (args.Length() == 2)
178 offset = toUInt32(args[1]);
179 ExceptionCode ec = 0;
180 impl->set(src, offset, ec);
181 V8Proxy::setDOMException(ec);
182 return v8::Undefined();
183 }
184
185 if (args[0]->IsObject()) {
186 // void set(in sequence<long> array, [Optional] in unsigned long offset);
187 v8::Local<v8::Object> array = args[0]->ToObject();
188 uint32_t offset = 0;
189 if (args.Length() == 2)
190 offset = toUInt32(args[1]);
191 uint32_t length = toUInt32(array->Get(v8::String::New("length")));
192 if (offset > impl->length()
193 || offset + length > impl->length()
194 || offset + length < offset)
195 // Out of range offset or overflow
196 V8Proxy::setDOMException(INDEX_SIZE_ERR);
197 else
198 for (uint32_t i = 0; i < length; i++)
199 impl->set(offset + i, array->Get(v8::Integer::NewFromUnsigned(i))->NumberValue());
200
201 return v8::Undefined();
202 }
203
204 V8Proxy::setDOMException(SYNTAX_ERR);
205 return notHandledByInterceptor();
206 }
207
208 }
209
210 #endif // V8ArrayBufferViewCustom_h
211