third_party/llvm-project/lldb/source/Utility/DataBufferHeap.cpp

//===-- DataBufferHeap.cpp --------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "lldb/Utility/DataBufferHeap.h"

// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes

using namespace lldb_private;

//----------------------------------------------------------------------
// Default constructor
//----------------------------------------------------------------------
DataBufferHeap::DataBufferHeap() : m_data() {}

//----------------------------------------------------------------------
// Initialize this class with "n" characters and fill the buffer with "ch".
//----------------------------------------------------------------------
DataBufferHeap::DataBufferHeap(lldb::offset_t n, uint8_t ch) : m_data() {
  if (n < m_data.max_size())
    m_data.assign(n, ch);
}

//----------------------------------------------------------------------
// Initialize this class with a copy of the "n" bytes from the "bytes" buffer.
//----------------------------------------------------------------------
DataBufferHeap::DataBufferHeap(const void *src, lldb::offset_t src_len)
    : m_data() {
  CopyData(src, src_len);
}

//----------------------------------------------------------------------
// Virtual destructor since this class inherits from a pure virtual base class.
//----------------------------------------------------------------------
DataBufferHeap::~DataBufferHeap() = default;

//----------------------------------------------------------------------
// Return a pointer to the bytes owned by this object, or nullptr if the object
// contains no bytes.
//----------------------------------------------------------------------
uint8_t *DataBufferHeap::GetBytes() {
  return (m_data.empty() ? nullptr : m_data.data());
}

//----------------------------------------------------------------------
// Return a const pointer to the bytes owned by this object, or nullptr if the
// object contains no bytes.
//----------------------------------------------------------------------
const uint8_t *DataBufferHeap::GetBytes() const {
  return (m_data.empty() ? nullptr : m_data.data());
}

//----------------------------------------------------------------------
// Return the number of bytes this object currently contains.
//----------------------------------------------------------------------
uint64_t DataBufferHeap::GetByteSize() const { return m_data.size(); }

//----------------------------------------------------------------------
// Sets the number of bytes that this object should be able to contain. This
// can be used prior to copying data into the buffer.
//----------------------------------------------------------------------
uint64_t DataBufferHeap::SetByteSize(uint64_t new_size) {
  m_data.resize(new_size);
  return m_data.size();
}

void DataBufferHeap::CopyData(const void *src, uint64_t src_len) {
  const uint8_t *src_u8 = (const uint8_t *)src;
  if (src && src_len > 0)
    m_data.assign(src_u8, src_u8 + src_len);
  else
    m_data.clear();
}

void DataBufferHeap::AppendData(const void *src, uint64_t src_len) {
  m_data.insert(m_data.end(), (const uint8_t *)src,
                (const uint8_t *)src + src_len);
}

void DataBufferHeap::Clear() {
  buffer_t empty;
  m_data.swap(empty);
}