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// Copyright 2014 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/fx_basic.h"
#include "third_party/base/numerics/safe_math.h"
CFX_BasicArray::CFX_BasicArray(int unit_size)
: m_pData(nullptr), m_nSize(0), m_nMaxSize(0) {
if (unit_size < 0 || unit_size > (1 << 28)) {
m_nUnitSize = 4;
} else {
m_nUnitSize = unit_size;
}
}
CFX_BasicArray::~CFX_BasicArray() {
FX_Free(m_pData);
}
bool CFX_BasicArray::SetSize(int nNewSize) {
if (nNewSize <= 0) {
FX_Free(m_pData);
m_pData = nullptr;
m_nSize = m_nMaxSize = 0;
return 0 == nNewSize;
}
if (!m_pData) {
pdfium::base::CheckedNumeric<int> totalSize = nNewSize;
totalSize *= m_nUnitSize;
if (!totalSize.IsValid()) {
m_nSize = m_nMaxSize = 0;
return false;
}
m_pData = FX_Alloc(uint8_t, totalSize.ValueOrDie());
m_nSize = m_nMaxSize = nNewSize;
} else if (nNewSize <= m_nMaxSize) {
if (nNewSize > m_nSize) {
FXSYS_memset(m_pData + m_nSize * m_nUnitSize, 0,
(nNewSize - m_nSize) * m_nUnitSize);
}
m_nSize = nNewSize;
} else {
int nNewMax = nNewSize < m_nMaxSize ? m_nMaxSize : nNewSize;
pdfium::base::CheckedNumeric<int> totalSize = nNewMax;
totalSize *= m_nUnitSize;
if (!totalSize.IsValid() || nNewMax < m_nSize) {
return false;
}
uint8_t* pNewData = FX_Realloc(uint8_t, m_pData, totalSize.ValueOrDie());
if (!pNewData) {
return false;
}
FXSYS_memset(pNewData + m_nSize * m_nUnitSize, 0,
(nNewMax - m_nSize) * m_nUnitSize);
m_pData = pNewData;
m_nSize = nNewSize;
m_nMaxSize = nNewMax;
}
return true;
}
bool CFX_BasicArray::Append(const CFX_BasicArray& src) {
int nOldSize = m_nSize;
pdfium::base::CheckedNumeric<int> newSize = m_nSize;
newSize += src.m_nSize;
if (m_nUnitSize != src.m_nUnitSize || !newSize.IsValid() ||
!SetSize(newSize.ValueOrDie())) {
return false;
}
FXSYS_memcpy(m_pData + nOldSize * m_nUnitSize, src.m_pData,
src.m_nSize * m_nUnitSize);
return true;
}
bool CFX_BasicArray::Copy(const CFX_BasicArray& src) {
if (!SetSize(src.m_nSize)) {
return false;
}
FXSYS_memcpy(m_pData, src.m_pData, src.m_nSize * m_nUnitSize);
return true;
}
uint8_t* CFX_BasicArray::InsertSpaceAt(int nIndex, int nCount) {
if (nIndex < 0 || nCount <= 0) {
return nullptr;
}
if (nIndex >= m_nSize) {
if (!SetSize(nIndex + nCount)) {
return nullptr;
}
} else {
int nOldSize = m_nSize;
if (!SetSize(m_nSize + nCount)) {
return nullptr;
}
FXSYS_memmove(m_pData + (nIndex + nCount) * m_nUnitSize,
m_pData + nIndex * m_nUnitSize,
(nOldSize - nIndex) * m_nUnitSize);
FXSYS_memset(m_pData + nIndex * m_nUnitSize, 0, nCount * m_nUnitSize);
}
return m_pData + nIndex * m_nUnitSize;
}
bool CFX_BasicArray::RemoveAt(int nIndex, int nCount) {
if (nIndex < 0 || nCount <= 0 || m_nSize < nIndex + nCount) {
return false;
}
int nMoveCount = m_nSize - (nIndex + nCount);
if (nMoveCount) {
FXSYS_memmove(m_pData + nIndex * m_nUnitSize,
m_pData + (nIndex + nCount) * m_nUnitSize,
nMoveCount * m_nUnitSize);
}
m_nSize -= nCount;
return true;
}
bool CFX_BasicArray::InsertAt(int nStartIndex,
const CFX_BasicArray* pNewArray) {
if (!pNewArray) {
return false;
}
if (pNewArray->m_nSize == 0) {
return true;
}
if (!InsertSpaceAt(nStartIndex, pNewArray->m_nSize)) {
return false;
}
FXSYS_memcpy(m_pData + nStartIndex * m_nUnitSize, pNewArray->m_pData,
pNewArray->m_nSize * m_nUnitSize);
return true;
}
const void* CFX_BasicArray::GetDataPtr(int index) const {
if (index < 0 || index >= m_nSize || !m_pData) {
return nullptr;
}
return m_pData + index * m_nUnitSize;
}
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