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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "config.h"
      6 #include "wtf/ArrayPiece.h"
      7 
      8 #include "wtf/ArrayBuffer.h"
      9 #include "wtf/ArrayBufferView.h"
     10 #include "wtf/Assertions.h"
     11 
     12 namespace WTF {
     13 
     14 ArrayPiece::ArrayPiece()
     15 {
     16     initNull();
     17 }
     18 
     19 ArrayPiece::ArrayPiece(void* data, unsigned byteLength)
     20 {
     21     initWithData(data, byteLength);
     22 }
     23 
     24 ArrayPiece::ArrayPiece(ArrayBuffer* buffer)
     25 {
     26     if (buffer) {
     27         initWithData(buffer->data(), buffer->byteLength());
     28     } else {
     29         initNull();
     30     }
     31 }
     32 
     33 ArrayPiece::ArrayPiece(ArrayBufferView* buffer)
     34 {
     35     if (buffer) {
     36         initWithData(buffer->baseAddress(), buffer->byteLength());
     37     } else {
     38         initNull();
     39     }
     40 }
     41 
     42 bool ArrayPiece::isNull() const
     43 {
     44     return m_isNull;
     45 }
     46 
     47 void* ArrayPiece::data() const
     48 {
     49     ASSERT(!isNull());
     50     return m_data;
     51 }
     52 
     53 unsigned char* ArrayPiece::bytes() const
     54 {
     55     return static_cast<unsigned char*>(data());
     56 }
     57 
     58 unsigned ArrayPiece::byteLength() const
     59 {
     60     ASSERT(!isNull());
     61     return m_byteLength;
     62 }
     63 
     64 void ArrayPiece::initWithData(void* data, unsigned byteLength)
     65 {
     66     m_byteLength = byteLength;
     67     m_data = data;
     68     m_isNull = false;
     69 }
     70 
     71 void ArrayPiece::initNull()
     72 {
     73     m_byteLength = 0;
     74     m_data = 0;
     75     m_isNull = true;
     76 }
     77 
     78 } // namespace WTF
     79