1 // Copyright 2018 PDFium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com 6 7 #include "fpdfsdk/cpdfsdk_customaccess.h" 8 9 #include "core/fxcrt/fx_safe_types.h" 10 CPDFSDK_CustomAccess(FPDF_FILEACCESS * pFileAccess)11CPDFSDK_CustomAccess::CPDFSDK_CustomAccess(FPDF_FILEACCESS* pFileAccess) 12 : m_FileAccess(*pFileAccess) {} 13 14 CPDFSDK_CustomAccess::~CPDFSDK_CustomAccess() = default; 15 GetSize()16FX_FILESIZE CPDFSDK_CustomAccess::GetSize() { 17 return m_FileAccess.m_FileLen; 18 } 19 ReadBlockAtOffset(void * buffer,FX_FILESIZE offset,size_t size)20bool CPDFSDK_CustomAccess::ReadBlockAtOffset(void* buffer, 21 FX_FILESIZE offset, 22 size_t size) { 23 if (!buffer || offset < 0 || !size) 24 return false; 25 26 if (!pdfium::base::IsValueInRangeForNumericType<FX_FILESIZE>(size)) 27 return false; 28 29 FX_SAFE_FILESIZE new_pos = size; 30 new_pos += offset; 31 return new_pos.IsValid() && new_pos.ValueOrDie() <= GetSize() && 32 m_FileAccess.m_GetBlock(m_FileAccess.m_Param, offset, 33 static_cast<uint8_t*>(buffer), size); 34 } 35