1 //===-- DataBufferHeap.cpp ------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "lldb/Utility/DataBufferHeap.h"
10 
11 
12 using namespace lldb_private;
13 
14 // Default constructor
15 DataBufferHeap::DataBufferHeap() : m_data() {}
16 
17 // Initialize this class with "n" characters and fill the buffer with "ch".
18 DataBufferHeap::DataBufferHeap(lldb::offset_t n, uint8_t ch) : m_data() {
19   if (n < m_data.max_size())
20     m_data.assign(n, ch);
21 }
22 
23 // Initialize this class with a copy of the "n" bytes from the "bytes" buffer.
24 DataBufferHeap::DataBufferHeap(const void *src, lldb::offset_t src_len)
25     : m_data() {
26   CopyData(src, src_len);
27 }
28 
29 DataBufferHeap::DataBufferHeap(const DataBuffer &data_buffer) : m_data() {
30   CopyData(data_buffer.GetBytes(), data_buffer.GetByteSize());
31 }
32 
33 // Virtual destructor since this class inherits from a pure virtual base class.
34 DataBufferHeap::~DataBufferHeap() = default;
35 
36 // Return a const pointer to the bytes owned by this object, or nullptr if the
37 // object contains no bytes.
38 const uint8_t *DataBufferHeap::GetBytesImpl() const {
39   return (m_data.empty() ? nullptr : m_data.data());
40 }
41 
42 // Return the number of bytes this object currently contains.
43 uint64_t DataBufferHeap::GetByteSize() const { return m_data.size(); }
44 
45 // Sets the number of bytes that this object should be able to contain. This
46 // can be used prior to copying data into the buffer.
47 uint64_t DataBufferHeap::SetByteSize(uint64_t new_size) {
48   if (new_size < m_data.max_size())
49     m_data.resize(new_size);
50   return m_data.size();
51 }
52 
53 void DataBufferHeap::CopyData(const void *src, uint64_t src_len) {
54   const uint8_t *src_u8 = static_cast<const uint8_t *>(src);
55   if (src && src_len > 0)
56     m_data.assign(src_u8, src_u8 + src_len);
57   else
58     m_data.clear();
59 }
60 
61 void DataBufferHeap::AppendData(const void *src, uint64_t src_len) {
62   m_data.insert(m_data.end(), static_cast<const uint8_t *>(src),
63                 static_cast<const uint8_t *>(src) + src_len);
64 }
65 
66 void DataBufferHeap::Clear() {
67   buffer_t empty;
68   m_data.swap(empty);
69 }
70 
71 char DataBuffer::ID;
72 char WritableDataBuffer::ID;
73 char DataBufferUnowned::ID;
74 char DataBufferHeap::ID;
75