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// Copyright 2017 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fxcrt/cfx_binarybuf.h"
#include <algorithm>
#include <utility>
#include "core/fxcrt/fx_safe_types.h"
CFX_BinaryBuf::CFX_BinaryBuf() = default;
CFX_BinaryBuf::CFX_BinaryBuf(CFX_BinaryBuf&& that) noexcept
: m_AllocStep(that.m_AllocStep),
m_AllocSize(that.m_AllocSize),
m_DataSize(that.m_DataSize),
m_pBuffer(std::move(that.m_pBuffer)) {
// Can't just default, need to leave |that| in a valid state, which means
// that the size members reflect the (null) moved-from buffer.
that.m_AllocStep = 0;
that.m_AllocSize = 0;
that.m_DataSize = 0;
}
CFX_BinaryBuf::~CFX_BinaryBuf() = default;
CFX_BinaryBuf& CFX_BinaryBuf::operator=(CFX_BinaryBuf&& that) noexcept {
// Can't just default, need to leave |that| in a valid state, which means
// that the size members reflect the (null) moved-from buffer.
m_AllocStep = that.m_AllocStep;
m_AllocSize = that.m_AllocSize;
m_DataSize = that.m_DataSize;
m_pBuffer = std::move(that.m_pBuffer);
that.m_AllocStep = 0;
that.m_AllocSize = 0;
that.m_DataSize = 0;
return *this;
}
void CFX_BinaryBuf::Delete(size_t start_index, size_t count) {
if (!m_pBuffer || count > m_DataSize || start_index > m_DataSize - count)
return;
memmove(m_pBuffer.get() + start_index, m_pBuffer.get() + start_index + count,
m_DataSize - start_index - count);
m_DataSize -= count;
}
pdfium::span<uint8_t> CFX_BinaryBuf::GetSpan() {
return {GetBuffer(), GetSize()};
}
pdfium::span<const uint8_t> CFX_BinaryBuf::GetSpan() const {
return {GetBuffer(), GetSize()};
}
size_t CFX_BinaryBuf::GetLength() const {
return m_DataSize;
}
void CFX_BinaryBuf::Clear() {
m_DataSize = 0;
}
std::unique_ptr<uint8_t, FxFreeDeleter> CFX_BinaryBuf::DetachBuffer() {
m_DataSize = 0;
m_AllocSize = 0;
return std::move(m_pBuffer);
}
void CFX_BinaryBuf::EstimateSize(size_t size) {
if (m_AllocSize < size)
ExpandBuf(size - m_DataSize);
}
void CFX_BinaryBuf::ExpandBuf(size_t add_size) {
FX_SAFE_SIZE_T new_size = m_DataSize;
new_size += add_size;
if (m_AllocSize >= new_size.ValueOrDie())
return;
size_t alloc_step = std::max(static_cast<size_t>(128),
m_AllocStep ? m_AllocStep : m_AllocSize / 4);
new_size += alloc_step - 1; // Quantize, don't combine these lines.
new_size /= alloc_step;
new_size *= alloc_step;
m_AllocSize = new_size.ValueOrDie();
m_pBuffer.reset(m_pBuffer
? FX_Realloc(uint8_t, m_pBuffer.release(), m_AllocSize)
: FX_Alloc(uint8_t, m_AllocSize));
}
void CFX_BinaryBuf::AppendSpan(pdfium::span<const uint8_t> span) {
return AppendBlock(span.data(), span.size());
}
void CFX_BinaryBuf::AppendBlock(const void* pBuf, size_t size) {
if (size == 0)
return;
ExpandBuf(size);
if (pBuf) {
memcpy(m_pBuffer.get() + m_DataSize, pBuf, size);
} else {
memset(m_pBuffer.get() + m_DataSize, 0, size);
}
m_DataSize += size;
}