third_party/WebKit/Source/wtf/ArrayPiece.cpp

   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