/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-  */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef _MORKBLOB_
#define _MORKBLOB_ 1

#ifndef _MORK_
#  include "mork.h"
#endif

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/*| Buf: the minimum needed to describe location and content length.
**| This is typically only enough to read from this buffer, since
**| one cannot write effectively without knowing the size of a buf.
|*/
class morkBuf {  // subset of nsIMdbYarn slots
 public:
  void* mBuf_Body;      // space for holding any binary content
  mork_fill mBuf_Fill;  // logical content in Buf in bytes

 public:
  morkBuf() {}
  morkBuf(const void* ioBuf, mork_fill inFill)
      : mBuf_Body((void*)ioBuf), mBuf_Fill(inFill) {}

  void ClearBufFill() { mBuf_Fill = 0; }

  static void NilBufBodyError(morkEnv* ev);

 private:  // copying is not allowed
  morkBuf(const morkBuf& other);
  morkBuf& operator=(const morkBuf& other);
};

/*| Blob: a buffer with an associated size, to increase known buf info
**| to include max capacity in addition to buf location and content.
**| This form factor allows us to allocate a vector of such blobs,
**| which can share the same managing heap stored elsewhere, and that
**| is why we don't include a pointer to a heap in this blob class.
|*/
class morkBlob : public morkBuf {  // greater subset of nsIMdbYarn slots

  // void*         mBuf_Body;  // space for holding any binary content
  // mdb_fill      mBuf_Fill;  // logical content in Buf in bytes
 public:
  mork_size mBlob_Size;  // physical size of Buf in bytes

 public:
  morkBlob() {}
  morkBlob(const void* ioBuf, mork_fill inFill, mork_size inSize)
      : morkBuf(ioBuf, inFill), mBlob_Size(inSize) {}

  static void BlobFillOverSizeError(morkEnv* ev);

 public:
  mork_bool GrowBlob(morkEnv* ev, nsIMdbHeap* ioHeap, mork_size inNewSize);

 private:  // copying is not allowed
  morkBlob(const morkBlob& other);
  morkBlob& operator=(const morkBlob& other);
};

/*| Text: a blob with an associated charset annotation, where the
**| charset actually includes the general notion of typing, and not
**| just a specification of character set alone; we want to permit
**| arbitrary charset annotations for ad hoc binary types as well.
**| (We avoid including a nsIMdbHeap pointer in morkText for the same
**| reason morkBlob does: we want minimal size vectors of morkText.)
|*/
class morkText : public morkBlob {  // greater subset of nsIMdbYarn slots

  // void*         mBuf_Body;  // space for holding any binary content
  // mdb_fill      mBuf_Fill;  // logical content in Buf in bytes
  // mdb_size      mBlob_Size;  // physical size of Buf in bytes

 public:
  mork_cscode mText_Form;  // charset format encoding

  morkText() {}

 private:  // copying is not allowed
  morkText(const morkText& other);
  morkText& operator=(const morkText& other);
};

/*| Coil: a text with an associated nsIMdbHeap instance that provides
**| all memory management for the space pointed to by mBuf_Body. (This
**| was the hardest type to give a name in this small class hierarchy,
**| because it's hard to characterize self-management of one's space.)
**| A coil is a self-contained blob that knows how to grow itself as
**| necessary to hold more content when necessary.  Coil descends from
**| morkText to include the mText_Form slot, even though this won't be
**| needed always, because we are not as concerned about the overall
**| size of this particular Coil object (if we were concerned about
**| the size of an array of Coil instances, we would not bother with
**| a separate heap pointer for each of them).
**|
**|| A coil makes a good medium in which to stream content as a sink,
**| so we will have a subclass of morkSink called morkCoil that
**| will stream bytes into this self-contained coil object. The name
**| of this morkCoil class derives more from this intended usage than
**| from anything else.  The Mork code to parse db content will use
**| coils with associated sinks to accumulate parsed strings.
**|
**|| Heap: this is the heap used for memory allocation.  This instance
**| is NOT refcounted, since this coil always assumes the heap is held
**| through a reference elsewhere (for example, through the same object
**| that contains or holds the coil itself.  This lack of refcounting
**| is consistent with the fact that morkCoil itself is not refcounted,
**| and is not intended for use as a standalone object.
|*/
class morkCoil : public morkText {  // self-managing text blob object

  // void*         mBuf_Body;  // space for holding any binary content
  // mdb_fill      mBuf_Fill;  // logical content in Buf in bytes
  // mdb_size      mBlob_Size;  // physical size of Buf in bytes
  // mdb_cscode    mText_Form;  // charset format encoding
 public:
  nsIMdbHeap* mCoil_Heap;  // storage manager for mBuf_Body pointer

 public:
  morkCoil(morkEnv* ev, nsIMdbHeap* ioHeap);

  void CloseCoil(morkEnv* ev);

  mork_bool GrowCoil(morkEnv* ev, mork_size inNewSize) {
    return this->GrowBlob(ev, mCoil_Heap, inNewSize);
  }

 private:  // copying is not allowed
  morkCoil(const morkCoil& other);
  morkCoil& operator=(const morkCoil& other);
};

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#endif /* _MORKBLOB_ */