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1 /* | 1 /* |
2 * Copyright (C) 2013 Google Inc. All rights reserved. | 2 * Copyright (C) 2013 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions are | 5 * modification, are permitted provided that the following conditions are |
6 * met: | 6 * met: |
7 * | 7 * |
8 * * Redistributions of source code must retain the above copyright | 8 * * Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
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46 WTF_MAKE_NONCOPYABLE(ArrayBufferBuilder); | 46 WTF_MAKE_NONCOPYABLE(ArrayBufferBuilder); |
47 | 47 |
48 public: | 48 public: |
49 // Creates an ArrayBufferBuilder using the default capacity. | 49 // Creates an ArrayBufferBuilder using the default capacity. |
50 ArrayBufferBuilder(); | 50 ArrayBufferBuilder(); |
51 | 51 |
52 ArrayBufferBuilder(unsigned capacity) | 52 ArrayBufferBuilder(unsigned capacity) |
53 : m_bytesUsed(0) | 53 : m_bytesUsed(0) |
54 , m_variableCapacity(true) | 54 , m_variableCapacity(true) |
55 { | 55 { |
56 m_buffer = ArrayBuffer::create(capacity, 1); | 56 m_buffer = ArrayBuffer::createOrNull(capacity, 1); |
57 } | 57 } |
58 | 58 |
59 bool isValid() const | 59 bool isValid() const |
60 { | 60 { |
61 return m_buffer; | 61 return m_buffer; |
62 } | 62 } |
63 | 63 |
64 // Appending empty data is not allowed. | 64 // Appending empty data is not allowed. |
65 unsigned append(const char* data, unsigned length); | 65 unsigned append(const char* data, unsigned length); |
66 | 66 |
67 // Returns the accumulated data as an ArrayBuffer instance. If needed, | 67 // Returns the accumulated data as an ArrayBuffer instance. If needed, |
68 // creates a new ArrayBuffer instance and copies contents from the internal | 68 // creates a new ArrayBuffer instance and copies contents from the internal |
69 // buffer to it. Otherwise, returns a PassRefPtr pointing to the internal | 69 // buffer to it. Otherwise, returns a PassRefPtr pointing to the internal |
70 // buffer. | 70 // buffer. |
71 PassRefPtr<ArrayBuffer> toArrayBuffer(); | 71 PassRefPtr<ArrayBuffer> toArrayBuffer(); |
72 | 72 |
73 // Converts the accumulated data into a String using the default encoding. | 73 // Converts the accumulated data into a String using the default encoding. |
74 String toString(); | 74 String toString(); |
75 | 75 |
76 // Number of bytes currently accumulated. | 76 // Number of bytes currently accumulated. |
77 unsigned byteLength() const | 77 unsigned byteLength() const |
78 { | 78 { |
79 return m_bytesUsed; | 79 return m_bytesUsed; |
80 } | 80 } |
81 | 81 |
82 // Number of bytes allocated. | 82 // Number of bytes allocated. |
83 unsigned capacity() const | 83 unsigned capacity() const |
84 { | 84 { |
| 85 ASSERT(isValid()); |
85 return m_buffer->byteLength(); | 86 return m_buffer->byteLength(); |
86 } | 87 } |
87 | 88 |
88 void shrinkToFit(); | 89 void shrinkToFit(); |
89 | 90 |
90 const void* data() const | 91 const void* data() const |
91 { | 92 { |
| 93 ASSERT(isValid()); |
92 return m_buffer->data(); | 94 return m_buffer->data(); |
93 } | 95 } |
94 | 96 |
95 // If set to false, the capacity won't be expanded and when appended data | 97 // If set to false, the capacity won't be expanded and when appended data |
96 // overflows, the overflowed part will be dropped. | 98 // overflows, the overflowed part will be dropped. |
97 void setVariableCapacity(bool value) | 99 void setVariableCapacity(bool value) |
98 { | 100 { |
99 m_variableCapacity = value; | 101 m_variableCapacity = value; |
100 } | 102 } |
101 | 103 |
102 private: | 104 private: |
103 // Expands the size of m_buffer to size + m_bytesUsed bytes. Returns true | 105 // Expands the size of m_buffer to size + m_bytesUsed bytes. Returns true |
104 // iff successful. If reallocation is needed, copies only data in | 106 // iff successful. If reallocation is needed, copies only data in |
105 // [0, m_bytesUsed) range. | 107 // [0, m_bytesUsed) range. |
106 bool expandCapacity(unsigned size); | 108 bool expandCapacity(unsigned size); |
107 | 109 |
108 unsigned m_bytesUsed; | 110 unsigned m_bytesUsed; |
109 bool m_variableCapacity; | 111 bool m_variableCapacity; |
110 RefPtr<ArrayBuffer> m_buffer; | 112 RefPtr<ArrayBuffer> m_buffer; |
111 }; | 113 }; |
112 | 114 |
113 } // namespace WTF | 115 } // namespace WTF |
114 | 116 |
115 using WTF::ArrayBufferBuilder; | 117 using WTF::ArrayBufferBuilder; |
116 | 118 |
117 #endif // ArrayBufferBuilder_h | 119 #endif // ArrayBufferBuilder_h |
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