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
40namespace WebCore {
41
42// Template function used by the ArrayBufferView*Constructor callbacks.
43template<class ArrayClass, class ElementType>
44v8::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.
79template<class ArrayClass, class ElementType>
80v8::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
163template <class CPlusPlusArrayType, class JavaScriptWrapperArrayType>
164v8::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