xref: /aosp_15_r20/external/lzma/CPP/7zip/Common/StreamObjects.h (revision f6dc9357d832569d4d1f5d24eacdb3935a1ae8e6)

// StreamObjects.h

#ifndef ZIP7_INC_STREAM_OBJECTS_H
#define ZIP7_INC_STREAM_OBJECTS_H

#include "../../Common/MyBuffer.h"
#include "../../Common/MyCom.h"
#include "../../Common/MyVector.h"

#include "../IStream.h"

Z7_CLASS_IMP_IInStream(
  CBufferInStream
)
  UInt64 _pos;
public:
  CByteBuffer Buf;
  void Init() { _pos = 0; }
};


Z7_CLASS_IMP_COM_0(
  CReferenceBuf
)
public:
  CByteBuffer Buf;
};


Z7_CLASS_IMP_IInStream(
  CBufInStream
)
  const Byte *_data;
  UInt64 _pos;
  size_t _size;
  CMyComPtr<IUnknown> _ref;
public:
  void Init(const Byte *data, size_t size, IUnknown *ref = NULL)
  {
    _data = data;
    _size = size;
    _pos = 0;
    _ref = ref;
  }
  void Init(CReferenceBuf *ref) { Init(ref->Buf, ref->Buf.Size(), ref); }

  // Seek() is allowed here. So reading order could be changed
  bool WasFinished() const { return _pos == _size; }
};


void Create_BufInStream_WithReference(const void *data, size_t size, IUnknown *ref, ISequentialInStream **stream);
void Create_BufInStream_WithNewBuffer(const void *data, size_t size, ISequentialInStream **stream);
inline void Create_BufInStream_WithNewBuffer(const CByteBuffer &buf, ISequentialInStream **stream)
  { Create_BufInStream_WithNewBuffer(buf, buf.Size(), stream); }


class CByteDynBuffer Z7_final
{
  size_t _capacity;
  Byte *_buf;
  Z7_CLASS_NO_COPY(CByteDynBuffer)
public:
  CByteDynBuffer(): _capacity(0), _buf(NULL) {}
  // there is no copy constructor. So don't copy this object.
  ~CByteDynBuffer() { Free(); }
  void Free() throw();
  size_t GetCapacity() const { return _capacity; }
  operator Byte*() const { return _buf; }
  operator const Byte*() const { return _buf; }
  bool EnsureCapacity(size_t capacity) throw();
};


Z7_CLASS_IMP_COM_1(
  CDynBufSeqOutStream
  , ISequentialOutStream
)
  CByteDynBuffer _buffer;
  size_t _size;
public:
  CDynBufSeqOutStream(): _size(0) {}
  void Init() { _size = 0;  }
  size_t GetSize() const { return _size; }
  const Byte *GetBuffer() const { return _buffer; }
  void CopyToBuffer(CByteBuffer &dest) const;
  Byte *GetBufPtrForWriting(size_t addSize);
  void UpdateSize(size_t addSize) { _size += addSize; }
};


Z7_CLASS_IMP_COM_1(
  CBufPtrSeqOutStream
  , ISequentialOutStream
)
  Byte *_buffer;
  size_t _size;
  size_t _pos;
public:
  void Init(Byte *buffer, size_t size)
  {
    _buffer = buffer;
    _pos = 0;
    _size = size;
  }
  size_t GetPos() const { return _pos; }
};


Z7_CLASS_IMP_COM_1(
  CSequentialOutStreamSizeCount
  , ISequentialOutStream
)
  CMyComPtr<ISequentialOutStream> _stream;
  UInt64 _size;
public:
  void SetStream(ISequentialOutStream *stream) { _stream = stream; }
  void Init() { _size = 0; }
  UInt64 GetSize() const { return _size; }
};


class CCachedInStream:
  public IInStream,
  public CMyUnknownImp
{
  Z7_IFACES_IMP_UNK_2(ISequentialInStream, IInStream)

  UInt64 *_tags;
  Byte *_data;
  size_t _dataSize;
  unsigned _blockSizeLog;
  unsigned _numBlocksLog;
  UInt64 _size;
  UInt64 _pos;
protected:
  virtual HRESULT ReadBlock(UInt64 blockIndex, Byte *dest, size_t blockSize) = 0;
public:
  CCachedInStream(): _tags(NULL), _data(NULL) {}
  virtual ~CCachedInStream() { Free(); } // the destructor must be virtual (Release() calls it) !!!
  void Free() throw();
  bool Alloc(unsigned blockSizeLog, unsigned numBlocksLog) throw();
  void Init(UInt64 size) throw();
};

#endif