blob: 4f828239ff7ba26495963737638bf35cdd0c0d50 [file] [log] [blame] [edit]
// Copyright 2018 The PDFium Authors
// 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"
#include "third_party/base/numerics/safe_conversions.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(pdfium::span<uint8_t> buffer,
FX_FILESIZE offset) {
if (buffer.empty() || offset < 0)
return false;
if (!pdfium::base::IsValueInRangeForNumericType<FX_FILESIZE>(buffer.size()))
return false;
FX_SAFE_FILESIZE new_pos = buffer.size();
new_pos += offset;
return new_pos.IsValid() && new_pos.ValueOrDie() <= GetSize() &&
m_FileAccess.m_GetBlock(
m_FileAccess.m_Param,
pdfium::base::checked_cast<unsigned long>(offset), buffer.data(),
pdfium::base::checked_cast<unsigned long>(buffer.size()));
}