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// Copyright 2014 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
#ifndef CORE_FXCRT_FX_STREAM_H_
#define CORE_FXCRT_FX_STREAM_H_
#include <stddef.h>
#include <stdint.h>
#include "core/fxcrt/bytestring.h"
#include "core/fxcrt/fx_types.h"
#include "core/fxcrt/retain_ptr.h"
#include "third_party/base/containers/span.h"
class IFX_WriteStream {
public:
// When `size` is 0, treat it as a no-op and return true.
virtual bool WriteBlock(pdfium::span<const uint8_t> data) = 0;
bool WriteString(ByteStringView str);
bool WriteByte(uint8_t byte);
bool WriteDWord(uint32_t i);
bool WriteFilesize(FX_FILESIZE size);
protected:
virtual ~IFX_WriteStream() = default;
};
class IFX_ArchiveStream : public IFX_WriteStream {
public:
virtual FX_FILESIZE CurrentOffset() const = 0;
};
class IFX_StreamWithSize {
public:
virtual FX_FILESIZE GetSize() = 0;
};
class IFX_RetainableWriteStream : virtual public Retainable,
public IFX_WriteStream {};
class IFX_SeekableWriteStream : virtual public IFX_StreamWithSize,
public IFX_RetainableWriteStream {
public:
// IFX_WriteStream:
bool WriteBlock(pdfium::span<const uint8_t> buffer) override;
virtual bool Flush() = 0;
virtual bool WriteBlockAtOffset(pdfium::span<const uint8_t> data,
FX_FILESIZE offset) = 0;
};
class IFX_SeekableReadStream : virtual public Retainable,
virtual public IFX_StreamWithSize {
public:
static RetainPtr<IFX_SeekableReadStream> CreateFromFilename(
const char* filename);
virtual bool IsEOF();
virtual FX_FILESIZE GetPosition();
[[nodiscard]] virtual size_t ReadBlock(pdfium::span<uint8_t> buffer);
[[nodiscard]] virtual bool ReadBlockAtOffset(pdfium::span<uint8_t> buffer,
FX_FILESIZE offset) = 0;
};
class IFX_SeekableStream : public IFX_SeekableReadStream,
public IFX_SeekableWriteStream {
public:
// IFX_SeekableWriteStream:
bool WriteBlock(pdfium::span<const uint8_t> buffer) override;
};
#endif // CORE_FXCRT_FX_STREAM_H_
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