| // 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/include/fxcrt/fx_basic.h" |
| #include "third_party/base/numerics/safe_math.h" |
| |
| CFX_BasicArray::CFX_BasicArray(int unit_size) |
| : m_pData(NULL), 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); |
| } |
| FX_BOOL CFX_BasicArray::SetSize(int nNewSize) { |
| if (nNewSize <= 0) { |
| FX_Free(m_pData); |
| m_pData = NULL; |
| m_nSize = m_nMaxSize = 0; |
| return 0 == nNewSize; |
| } |
| |
| if (m_pData == NULL) { |
| 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 == NULL) { |
| 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; |
| } |
| FX_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; |
| } |
| FX_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 NULL; |
| } |
| if (nIndex >= m_nSize) { |
| if (!SetSize(nIndex + nCount)) { |
| return NULL; |
| } |
| } else { |
| int nOldSize = m_nSize; |
| if (!SetSize(m_nSize + nCount)) { |
| return NULL; |
| } |
| 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; |
| } |
| FX_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; |
| } |
| FX_BOOL CFX_BasicArray::InsertAt(int nStartIndex, |
| const CFX_BasicArray* pNewArray) { |
| if (pNewArray == NULL) { |
| 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 == NULL) { |
| return NULL; |
| } |
| return m_pData + index * m_nUnitSize; |
| } |
| CFX_BaseSegmentedArray::CFX_BaseSegmentedArray(int unit_size, |
| int segment_units, |
| int index_size) |
| : m_UnitSize(unit_size), |
| m_SegmentSize(segment_units), |
| m_IndexSize(index_size), |
| m_IndexDepth(0), |
| m_DataSize(0), |
| m_pIndex(NULL) {} |
| void CFX_BaseSegmentedArray::SetUnitSize(int unit_size, |
| int segment_units, |
| int index_size) { |
| ASSERT(m_DataSize == 0); |
| m_UnitSize = unit_size; |
| m_SegmentSize = segment_units; |
| m_IndexSize = index_size; |
| } |
| CFX_BaseSegmentedArray::~CFX_BaseSegmentedArray() { |
| RemoveAll(); |
| } |
| static void _ClearIndex(int level, int size, void** pIndex) { |
| if (level == 0) { |
| FX_Free(pIndex); |
| return; |
| } |
| for (int i = 0; i < size; i++) { |
| if (pIndex[i] == NULL) { |
| continue; |
| } |
| _ClearIndex(level - 1, size, (void**)pIndex[i]); |
| } |
| FX_Free(pIndex); |
| } |
| void CFX_BaseSegmentedArray::RemoveAll() { |
| if (m_pIndex == NULL) { |
| return; |
| } |
| _ClearIndex(m_IndexDepth, m_IndexSize, (void**)m_pIndex); |
| m_pIndex = NULL; |
| m_IndexDepth = 0; |
| m_DataSize = 0; |
| } |
| void* CFX_BaseSegmentedArray::Add() { |
| if (m_DataSize % m_SegmentSize) { |
| return GetAt(m_DataSize++); |
| } |
| void* pSegment = FX_Alloc2D(uint8_t, m_UnitSize, m_SegmentSize); |
| if (m_pIndex == NULL) { |
| m_pIndex = pSegment; |
| m_DataSize++; |
| return pSegment; |
| } |
| if (m_IndexDepth == 0) { |
| void** pIndex = FX_Alloc(void*, m_IndexSize); |
| pIndex[0] = m_pIndex; |
| pIndex[1] = pSegment; |
| m_pIndex = pIndex; |
| m_DataSize++; |
| m_IndexDepth++; |
| return pSegment; |
| } |
| int seg_index = m_DataSize / m_SegmentSize; |
| if (seg_index % m_IndexSize) { |
| void** pIndex = GetIndex(seg_index); |
| pIndex[seg_index % m_IndexSize] = pSegment; |
| m_DataSize++; |
| return pSegment; |
| } |
| int tree_size = 1; |
| int i; |
| for (i = 0; i < m_IndexDepth; i++) { |
| tree_size *= m_IndexSize; |
| } |
| if (m_DataSize == tree_size * m_SegmentSize) { |
| void** pIndex = FX_Alloc(void*, m_IndexSize); |
| pIndex[0] = m_pIndex; |
| m_pIndex = pIndex; |
| m_IndexDepth++; |
| } else { |
| tree_size /= m_IndexSize; |
| } |
| void** pSpot = (void**)m_pIndex; |
| for (i = 1; i < m_IndexDepth; i++) { |
| if (pSpot[seg_index / tree_size] == NULL) { |
| pSpot[seg_index / tree_size] = FX_Alloc(void*, m_IndexSize); |
| } |
| pSpot = (void**)pSpot[seg_index / tree_size]; |
| seg_index = seg_index % tree_size; |
| tree_size /= m_IndexSize; |
| } |
| if (i < m_IndexDepth) { |
| FX_Free(pSegment); |
| RemoveAll(); |
| return NULL; |
| } |
| pSpot[seg_index % m_IndexSize] = pSegment; |
| m_DataSize++; |
| return pSegment; |
| } |
| void** CFX_BaseSegmentedArray::GetIndex(int seg_index) const { |
| ASSERT(m_IndexDepth != 0); |
| if (m_IndexDepth == 1) { |
| return (void**)m_pIndex; |
| } |
| if (m_IndexDepth == 2) { |
| return (void**)((void**)m_pIndex)[seg_index / m_IndexSize]; |
| } |
| int tree_size = 1; |
| int i; |
| for (i = 1; i < m_IndexDepth; i++) { |
| tree_size *= m_IndexSize; |
| } |
| void** pSpot = (void**)m_pIndex; |
| for (i = 1; i < m_IndexDepth; i++) { |
| pSpot = (void**)pSpot[seg_index / tree_size]; |
| seg_index = seg_index % tree_size; |
| tree_size /= m_IndexSize; |
| } |
| return pSpot; |
| } |
| void* CFX_BaseSegmentedArray::IterateSegment(const uint8_t* pSegment, |
| int count, |
| FX_BOOL (*callback)(void* param, |
| void* pData), |
| void* param) const { |
| for (int i = 0; i < count; i++) { |
| if (!callback(param, (void*)(pSegment + i * m_UnitSize))) { |
| return (void*)(pSegment + i * m_UnitSize); |
| } |
| } |
| return NULL; |
| } |
| void* CFX_BaseSegmentedArray::IterateIndex(int level, |
| int& start, |
| void** pIndex, |
| FX_BOOL (*callback)(void* param, |
| void* pData), |
| void* param) const { |
| if (level == 0) { |
| int count = m_DataSize - start; |
| if (count > m_SegmentSize) { |
| count = m_SegmentSize; |
| } |
| start += count; |
| return IterateSegment((const uint8_t*)pIndex, count, callback, param); |
| } |
| for (int i = 0; i < m_IndexSize; i++) { |
| if (pIndex[i] == NULL) { |
| continue; |
| } |
| void* p = |
| IterateIndex(level - 1, start, (void**)pIndex[i], callback, param); |
| if (p) { |
| return p; |
| } |
| } |
| return NULL; |
| } |
| void* CFX_BaseSegmentedArray::Iterate(FX_BOOL (*callback)(void* param, |
| void* pData), |
| void* param) const { |
| if (m_pIndex == NULL) { |
| return NULL; |
| } |
| int start = 0; |
| return IterateIndex(m_IndexDepth, start, (void**)m_pIndex, callback, param); |
| } |
| void* CFX_BaseSegmentedArray::GetAt(int index) const { |
| if (index < 0 || index >= m_DataSize) { |
| return NULL; |
| } |
| if (m_IndexDepth == 0) { |
| return (uint8_t*)m_pIndex + m_UnitSize * index; |
| } |
| int seg_index = index / m_SegmentSize; |
| return (uint8_t*)GetIndex(seg_index)[seg_index % m_IndexSize] + |
| (index % m_SegmentSize) * m_UnitSize; |
| } |
| void CFX_BaseSegmentedArray::Delete(int index, int count) { |
| if (index < 0 || count < 1 || index + count > m_DataSize) { |
| return; |
| } |
| int i; |
| for (i = index; i < m_DataSize - count; i++) { |
| uint8_t* pSrc = (uint8_t*)GetAt(i + count); |
| uint8_t* pDest = (uint8_t*)GetAt(i); |
| for (int j = 0; j < m_UnitSize; j++) { |
| pDest[j] = pSrc[j]; |
| } |
| } |
| int new_segs = (m_DataSize - count + m_SegmentSize - 1) / m_SegmentSize; |
| int old_segs = (m_DataSize + m_SegmentSize - 1) / m_SegmentSize; |
| if (new_segs < old_segs) { |
| if (m_IndexDepth) { |
| for (i = new_segs; i < old_segs; i++) { |
| void** pIndex = GetIndex(i); |
| FX_Free(pIndex[i % m_IndexSize]); |
| pIndex[i % m_IndexSize] = NULL; |
| } |
| } else { |
| FX_Free(m_pIndex); |
| m_pIndex = NULL; |
| } |
| } |
| m_DataSize -= count; |
| } |
