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| 1 /* | |
| 2 * Copyright (C) 2013 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 ArrayBufferBuilder_h | |
| 32 #define ArrayBufferBuilder_h | |
| 33 | |
| 34 #include "wtf/Allocator.h" | |
| 35 #include "wtf/ArrayBuffer.h" | |
| 36 #include "wtf/Noncopyable.h" | |
| 37 #include "wtf/RefPtr.h" | |
| 38 #include "wtf/text/WTFString.h" | |
| 39 | |
| 40 namespace WTF { | |
| 41 | |
| 42 // A utility class to build an ArrayBuffer instance. Validity must be checked | |
| 43 // by isValid() before using an instance. | |
| 44 class WTF_EXPORT ArrayBufferBuilder final { | |
| 45 // Disallow copying since it's expensive and we don't want code to do it by | |
| 46 // accident. | |
| 47 WTF_MAKE_NONCOPYABLE(ArrayBufferBuilder); | |
| 48 USING_FAST_MALLOC(ArrayBufferBuilder); | |
| 49 | |
| 50 public: | |
| 51 // Creates an ArrayBufferBuilder using the default capacity. | |
| 52 ArrayBufferBuilder(); | |
| 53 | |
| 54 ArrayBufferBuilder(unsigned capacity) | |
| 55 : m_bytesUsed(0) | |
| 56 , m_variableCapacity(true) | |
| 57 { | |
| 58 m_buffer = ArrayBuffer::create(capacity, 1); | |
| 59 } | |
| 60 | |
| 61 bool isValid() const | |
| 62 { | |
| 63 return m_buffer; | |
| 64 } | |
| 65 | |
| 66 // Appending empty data is not allowed. | |
| 67 unsigned append(const char* data, unsigned length); | |
| 68 | |
| 69 // Returns the accumulated data as an ArrayBuffer instance. If needed, | |
| 70 // creates a new ArrayBuffer instance and copies contents from the internal | |
| 71 // buffer to it. Otherwise, returns a PassRefPtr pointing to the internal | |
| 72 // buffer. | |
| 73 PassRefPtr<ArrayBuffer> toArrayBuffer(); | |
| 74 | |
| 75 // Converts the accumulated data into a String using the default encoding. | |
| 76 String toString(); | |
| 77 | |
| 78 // Number of bytes currently accumulated. | |
| 79 unsigned byteLength() const | |
| 80 { | |
| 81 return m_bytesUsed; | |
| 82 } | |
| 83 | |
| 84 // Number of bytes allocated. | |
| 85 unsigned capacity() const | |
| 86 { | |
| 87 return m_buffer->byteLength(); | |
| 88 } | |
| 89 | |
| 90 void shrinkToFit(); | |
| 91 | |
| 92 const void* data() const | |
| 93 { | |
| 94 return m_buffer->data(); | |
| 95 } | |
| 96 | |
| 97 // If set to false, the capacity won't be expanded and when appended data | |
| 98 // overflows, the overflowed part will be dropped. | |
| 99 void setVariableCapacity(bool value) | |
| 100 { | |
| 101 m_variableCapacity = value; | |
| 102 } | |
| 103 | |
| 104 private: | |
| 105 // Expands the size of m_buffer to size + m_bytesUsed bytes. Returns true | |
| 106 // iff successful. If reallocation is needed, copies only data in | |
| 107 // [0, m_bytesUsed) range. | |
| 108 bool expandCapacity(unsigned size); | |
| 109 | |
| 110 unsigned m_bytesUsed; | |
| 111 bool m_variableCapacity; | |
| 112 RefPtr<ArrayBuffer> m_buffer; | |
| 113 }; | |
| 114 | |
| 115 } // namespace WTF | |
| 116 | |
| 117 using WTF::ArrayBufferBuilder; | |
| 118 | |
| 119 #endif // ArrayBufferBuilder_h | |
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Chromium Code Reviews
Issue 1875343002:
Move WTF classes related to typed arrays to wtf/typed_arrays (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master