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<class C, typename T>
108PassRefPtr<C> constructArrayBufferView(JSC::ExecState* exec)
109{
110    // There are 3 constructors:
111    //
112    //  1) (in int size)
113    //  2) (in ArrayBuffer buffer, [Optional] in int offset, [Optional] in unsigned int length)
114    //  3) (in sequence<T>) - This ends up being a JS "array-like" object
115    //
116    // For the 0 args case, just create a zero-length view. We could
117    // consider raising a SyntaxError for this case, but not all
118    // JavaScript DOM bindings can distinguish between "new
119    // <Type>Array()" and what occurs when a previously-constructed
120    // ArrayBufferView is returned to JavaScript; e.g., from
121    // "array.subset()".
122    if (exec->argumentCount() < 1)
123        return C::create(0);
124
125    if (exec->argument(0).isNull()) {
126        // Invalid first argument
127        throwTypeError(exec);
128        return 0;
129    }
130
131    if (exec->argument(0).isObject()) {
132        RefPtr<C> view = constructArrayBufferViewWithArrayBufferArgument<C, T>(exec);
133        if (view)
134            return view;
135
136        JSC::JSObject* srcArray = asObject(exec->argument(0));
137        uint32_t length = srcArray->get(exec, JSC::Identifier(exec, "length")).toUInt32(exec);
138        RefPtr<C> array = C::create(length);
139        if (!array) {
140            setDOMException(exec, INDEX_SIZE_ERR);
141            return array;
142        }
143
144        for (unsigned i = 0; i < length; ++i) {
145            JSC::JSValue v = srcArray->get(exec, i);
146            array->set(i, v.toNumber(exec));
147        }
148        return array;
149    }
150
151    int length = exec->argument(0).toInt32(exec);
152    RefPtr<C> result;
153    if (length >= 0)
154        result = C::create(static_cast<unsigned>(length));
155    if (!result)
156        throwError(exec, createRangeError(exec, "ArrayBufferView size is not a small enough positive integer."));
157    return result;
158}
159
160template <typename JSType, typename WebCoreType>
161static JSC::JSValue toJSArrayBufferView(JSC::ExecState* exec, JSDOMGlobalObject* globalObject, WebCoreType* object)
162{
163    if (!object)
164        return JSC::jsNull();
165
166    if (JSDOMWrapper* wrapper = getCachedWrapper(currentWorld(exec), object))
167        return wrapper;
168
169    exec->heap()->reportExtraMemoryCost(object->byteLength());
170    return createWrapper<JSType>(exec, globalObject, object);
171}
172
173} // namespace WebCore
174
175#endif // JSArrayBufferViewHelper_h
176