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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 "core/fxcrt/cfx_readonlymemorystream.h"
#include "core/fxcrt/fx_safe_types.h"
CFX_ReadOnlyMemoryStream::CFX_ReadOnlyMemoryStream(
pdfium::span<const uint8_t> span)
: m_span(span) {}
CFX_ReadOnlyMemoryStream::~CFX_ReadOnlyMemoryStream() = default;
FX_FILESIZE CFX_ReadOnlyMemoryStream::GetSize() {
return pdfium::base::checked_cast<FX_FILESIZE>(m_span.size());
}
bool CFX_ReadOnlyMemoryStream::ReadBlock(void* buffer,
FX_FILESIZE offset,
size_t size) {
if (!buffer || offset < 0 || size == 0)
return false;
FX_SAFE_SIZE_T pos = size;
pos += offset;
if (!pos.IsValid() || pos.ValueOrDie() > m_span.size())
return false;
auto copy_span = m_span.subspan(offset, size);
memcpy(buffer, copy_span.data(), copy_span.size());
return true;
}
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