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// Copyright 2018 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 "fpdfsdk/cpdfsdk_customaccess.h"
#include "core/fxcrt/fx_safe_types.h"
CPDFSDK_CustomAccess::CPDFSDK_CustomAccess(FPDF_FILEACCESS* pFileAccess)
: m_FileAccess(*pFileAccess) {}
CPDFSDK_CustomAccess::~CPDFSDK_CustomAccess() = default;
FX_FILESIZE CPDFSDK_CustomAccess::GetSize() {
return m_FileAccess.m_FileLen;
}
bool CPDFSDK_CustomAccess::ReadBlockAtOffset(void* buffer,
FX_FILESIZE offset,
size_t size) {
if (!buffer || offset < 0 || !size)
return false;
FX_SAFE_FILESIZE new_pos = pdfium::base::checked_cast<FX_FILESIZE>(size);
new_pos += offset;
return new_pos.IsValid() && new_pos.ValueOrDie() <= GetSize() &&
m_FileAccess.m_GetBlock(m_FileAccess.m_Param, offset,
static_cast<uint8_t*>(buffer), size);
}