JSArrayBufferViewHelper.h revision ab9e7a118cf1ea2e3a93dce683b2ded3e7291ddb 
1/*
2 * Copyright (C) 2009 Apple Inc. All rights reserved.
3 * Copyright (C) 2009 Google Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef JSArrayBufferViewHelper_h
28#define JSArrayBufferViewHelper_h
29
30#include "ArrayBufferView.h"
31#include "ExceptionCode.h"
32#include "JSArrayBuffer.h"
33#include "JSDOMBinding.h"
34#include <interpreter/CallFrame.h>
35#include <runtime/ArgList.h>
36#include <runtime/Error.h>
37#include <runtime/JSObject.h>
38#include <runtime/JSValue.h>
39
40namespace WebCore {
41
42template <class T>
43JSC::JSValue setWebGLArrayHelper(JSC::ExecState* exec, T* impl, T* (*conversionFunc)(JSC::JSValue))
44{
45    if (exec->argumentCount() < 1)
46        return JSC::throwSyntaxError(exec);
47
48    T* array = (*conversionFunc)(exec->argument(0));
49    if (array) {
50        // void set(in WebGL<T>Array array, [Optional] in unsigned long offset);
51        unsigned offset = 0;
52        if (exec->argumentCount() == 2)
53            offset = exec->argument(1).toInt32(exec);
54        ExceptionCode ec = 0;
55        impl->set(array, offset, ec);
56        setDOMException(exec, ec);
57        return JSC::jsUndefined();
58    }
59
60    if (exec->argument(0).isObject()) {
61        // void set(in sequence<long> array, [Optional] in unsigned long offset);
62        JSC::JSObject* array = JSC::asObject(exec->argument(0));
63        uint32_t offset = 0;
64        if (exec->argumentCount() == 2)
65            offset = exec->argument(1).toInt32(exec);
66        uint32_t length = array->get(exec, JSC::Identifier(exec, "length")).toInt32(exec);
67        if (offset > impl->length()
68            || offset + length > impl->length()
69            || offset + length < offset)
70            setDOMException(exec, INDEX_SIZE_ERR);
71        else {
72            for (uint32_t i = 0; i < length; i++) {
73                JSC::JSValue v = array->get(exec, i);
74                if (exec->hadException())
75                    return JSC::jsUndefined();
76                impl->set(i + offset, v.toNumber(exec));
77            }
78        }
79
80        return JSC::jsUndefined();
81    }
82
83    return JSC::throwSyntaxError(exec);
84}
85
86// Template function used by XXXArrayConstructors.
87// If this returns 0, it will already have thrown a JavaScript exception.
88template<class C, typename T>
89PassRefPtr<C> constructArrayBufferViewWithArrayBufferArgument(JSC::ExecState* exec)
90{
91    RefPtr<ArrayBuffer> buffer = toArrayBuffer(exec->argument(0));
92    if (!buffer)
93        return 0;
94
95    unsigned offset = (exec->argumentCount() > 1) ? exec->argument(1).toUInt32(exec) : 0;
96    if ((buffer->byteLength() - offset) % sizeof(T))
97        throwError(exec, createRangeError(exec, "ArrayBuffer length minus the byteOffset is not a multiple of the element size."));
98    unsigned int length = (buffer->byteLength() - offset) / sizeof(T);
99    if (exec->argumentCount() > 2)
100        length = exec->argument(2).toUInt32(exec);
101    RefPtr<C> array = C::create(buffer, offset, length);
102    if (!array)
103        setDOMException(exec, INDEX_SIZE_ERR);
104    return array;
105}
106
107template<typename T>
108inline T convertArrayValue(JSC::ExecState* exec, JSC::JSValue v)
109{
110    // For integral types, NaN values must be converted to zero.
111    return static_cast<T>(v.toInteger(exec));
112}
113
114template<>
115inline float convertArrayValue(JSC::ExecState* exec, JSC::JSValue v)
116{
117    return static_cast<float>(v.toNumber(exec));
118}
119
120template<>
121inline double convertArrayValue(JSC::ExecState* exec, JSC::JSValue v)
122{
123    return static_cast<double>(v.toNumber(exec));
124}
125
126template<class C, typename T>
127PassRefPtr<C> constructArrayBufferView(JSC::ExecState* exec)
128{
129    // There are 3 constructors:
130    //
131    //  1) (in int size)
132    //  2) (in ArrayBuffer buffer, [Optional] in int offset, [Optional] in unsigned int length)
133    //  3) (in sequence<T>) - This ends up being a JS "array-like" object
134    //
135    // For the 0 args case, just create a zero-length view. We could
136    // consider raising a SyntaxError for this case, but not all
137    // JavaScript DOM bindings can distinguish between "new
138    // <Type>Array()" and what occurs when a previously-constructed
139    // ArrayBufferView is returned to JavaScript; e.g., from
140    // "array.slice()".
141    if (exec->argumentCount() < 1)
142        return C::create(0);
143
144    if (exec->argument(0).isNull()) {
145        // Invalid first argument
146        throwTypeError(exec);
147        return 0;
148    }
149
150    if (exec->argument(0).isObject()) {
151        RefPtr<C> view = constructArrayBufferViewWithArrayBufferArgument<C, T>(exec);
152        if (view)
153            return view;
154
155        JSC::JSObject* array = asObject(exec->argument(0));
156        unsigned length = array->get(exec, JSC::Identifier(exec, "length")).toUInt32(exec);
157        void* tempValues;
158        if (!tryFastCalloc(length, sizeof(T)).getValue(tempValues)) {
159            JSC::throwError(exec, createError(exec, "Error"));
160            return 0;
161        }
162
163        OwnFastMallocPtr<T> values(static_cast<T*>(tempValues));
164        for (unsigned i = 0; i < length; ++i) {
165            JSC::JSValue v = array->get(exec, i);
166            values.get()[i] = convertArrayValue<T>(exec, v);
167        }
168
169        RefPtr<C> result = C::create(values.get(), length);
170        if (!result)
171            setDOMException(exec, INDEX_SIZE_ERR);
172        return result;
173    }
174
175    int length = exec->argument(0).toInt32(exec);
176    RefPtr<C> result;
177    if (length >= 0)
178        result = C::create(static_cast<unsigned>(length));
179    if (!result)
180        throwError(exec, createRangeError(exec, "ArrayBufferView size is not a small enough positive integer."));
181    return result;
182}
183
184template <typename JSType, typename WebCoreType>
185static JSC::JSValue toJSArrayBufferView(JSC::ExecState* exec, JSDOMGlobalObject* globalObject, WebCoreType* object)
186{
187    if (!object)
188        return JSC::jsNull();
189
190    if (DOMObject* wrapper = getCachedDOMObjectWrapper(exec, object))
191        return wrapper;
192
193    exec->heap()->reportExtraMemoryCost(object->byteLength());
194    return createDOMObjectWrapper<JSType>(exec, globalObject, object);
195}
196
197} // namespace WebCore
198
199#endif // JSArrayBufferViewHelper_h
200