1 //===-- DataBufferHeap.cpp --------------------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "lldb/Utility/DataBufferHeap.h"
11 
12 // C Includes
13 // C++ Includes
14 // Other libraries and framework includes
15 // Project includes
16 
17 using namespace lldb_private;
18 
19 //----------------------------------------------------------------------
20 // Default constructor
21 //----------------------------------------------------------------------
22 DataBufferHeap::DataBufferHeap() : m_data() {}
23 
24 //----------------------------------------------------------------------
25 // Initialize this class with "n" characters and fill the buffer with "ch".
26 //----------------------------------------------------------------------
27 DataBufferHeap::DataBufferHeap(lldb::offset_t n, uint8_t ch) : m_data() {
28   if (n < m_data.max_size())
29     m_data.assign(n, ch);
30 }
31 
32 //----------------------------------------------------------------------
33 // Initialize this class with a copy of the "n" bytes from the "bytes" buffer.
34 //----------------------------------------------------------------------
35 DataBufferHeap::DataBufferHeap(const void *src, lldb::offset_t src_len)
36     : m_data() {
37   CopyData(src, src_len);
38 }
39 
40 //----------------------------------------------------------------------
41 // Virtual destructor since this class inherits from a pure virtual base class.
42 //----------------------------------------------------------------------
43 DataBufferHeap::~DataBufferHeap() = default;
44 
45 //----------------------------------------------------------------------
46 // Return a pointer to the bytes owned by this object, or nullptr if the object
47 // contains no bytes.
48 //----------------------------------------------------------------------
49 uint8_t *DataBufferHeap::GetBytes() {
50   return (m_data.empty() ? nullptr : m_data.data());
51 }
52 
53 //----------------------------------------------------------------------
54 // Return a const pointer to the bytes owned by this object, or nullptr if the
55 // object contains no bytes.
56 //----------------------------------------------------------------------
57 const uint8_t *DataBufferHeap::GetBytes() const {
58   return (m_data.empty() ? nullptr : m_data.data());
59 }
60 
61 //----------------------------------------------------------------------
62 // Return the number of bytes this object currently contains.
63 //----------------------------------------------------------------------
64 uint64_t DataBufferHeap::GetByteSize() const { return m_data.size(); }
65 
66 //----------------------------------------------------------------------
67 // Sets the number of bytes that this object should be able to contain. This
68 // can be used prior to copying data into the buffer.
69 //----------------------------------------------------------------------
70 uint64_t DataBufferHeap::SetByteSize(uint64_t new_size) {
71   m_data.resize(new_size);
72   return m_data.size();
73 }
74 
75 void DataBufferHeap::CopyData(const void *src, uint64_t src_len) {
76   const uint8_t *src_u8 = (const uint8_t *)src;
77   if (src && src_len > 0)
78     m_data.assign(src_u8, src_u8 + src_len);
79   else
80     m_data.clear();
81 }
82 
83 void DataBufferHeap::AppendData(const void *src, uint64_t src_len) {
84   m_data.insert(m_data.end(), (const uint8_t *)src,
85                 (const uint8_t *)src + src_len);
86 }
87 
88 void DataBufferHeap::Clear() {
89   buffer_t empty;
90   m_data.swap(empty);
91 }
92