summaryrefslogtreecommitdiffstats
path: root/db/mork/src/morkAtom.cpp
blob: 0b73f97fae6d7fe7a1b6f8e3a0dbd1f058eeb08c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
/* -*- 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 _MDB_
#include "mdb.h"
#endif

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

#ifndef _MORKBLOB_
#include "morkBlob.h"
#endif

#ifndef _MORKATOM_
#include "morkAtom.h"
#endif

#ifndef _MORKENV_
#include "morkEnv.h"
#endif

#ifndef _MORKATOMSPACE_
#include "morkAtomSpace.h"
#endif

//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789

mork_bool
morkAtom::GetYarn(mdbYarn* outYarn) const
{
  const void* source = 0;  
  mdb_fill fill = 0; 
  mdb_cscode form = 0;
  outYarn->mYarn_More = 0;

    if ( this->IsWeeBook() )
    {
      morkWeeBookAtom* weeBook = (morkWeeBookAtom*) this;
      source = weeBook->mWeeBookAtom_Body;
      fill = weeBook->mAtom_Size;
    }
    else if ( this->IsBigBook() )
    {
      morkBigBookAtom* bigBook = (morkBigBookAtom*) this;
      source = bigBook->mBigBookAtom_Body;
      fill = bigBook->mBigBookAtom_Size;
      form = bigBook->mBigBookAtom_Form;
    }
    else if ( this->IsWeeAnon() )
    {
      morkWeeAnonAtom* weeAnon = (morkWeeAnonAtom*) this;
      source = weeAnon->mWeeAnonAtom_Body;
      fill = weeAnon->mAtom_Size;
    }
    else if ( this->IsBigAnon() )
    {
      morkBigAnonAtom* bigAnon = (morkBigAnonAtom*) this;
      source = bigAnon->mBigAnonAtom_Body;
      fill = bigAnon->mBigAnonAtom_Size;
      form = bigAnon->mBigAnonAtom_Form;
    }

  if ( source && fill ) // have an atom with nonempty content?
  {
    // if we have too many bytes, and yarn seems growable:
    if ( fill > outYarn->mYarn_Size && outYarn->mYarn_Grow ) // try grow?
      (*outYarn->mYarn_Grow)(outYarn, (mdb_size) fill); // request bigger
      
    mdb_size size = outYarn->mYarn_Size; // max dest size
    if ( fill > size ) // too much atom content?
    {
      outYarn->mYarn_More = fill - size; // extra atom bytes omitted
      fill = size; // copy no more bytes than size of yarn buffer
    }
    void* dest = outYarn->mYarn_Buf; // where bytes are going
    if ( !dest ) // nil destination address buffer?
      fill = 0; // we can't write any content at all
      
    if ( fill ) // anything to copy?
      MORK_MEMCPY(dest, source, fill); // copy fill bytes to yarn
      
    outYarn->mYarn_Fill = fill; // tell yarn size of copied content
  }
  else // no content to put into the yarn
  {
    outYarn->mYarn_Fill = 0; // tell yarn that atom has no bytes
  }
  outYarn->mYarn_Form = form; // always update the form slot
  
  return ( source != 0 );
}

/* static */
mork_bool
morkAtom::AliasYarn(const morkAtom* atom, mdbYarn* outYarn)
{
  outYarn->mYarn_More = 0;
  outYarn->mYarn_Form = 0;

  if ( atom )
  {
    if ( atom->IsWeeBook() )
    {
      morkWeeBookAtom* weeBook = (morkWeeBookAtom*) atom;
      outYarn->mYarn_Buf = weeBook->mWeeBookAtom_Body;
      outYarn->mYarn_Fill = weeBook->mAtom_Size;
      outYarn->mYarn_Size = weeBook->mAtom_Size;
    }
    else if ( atom->IsBigBook() )
    {
      morkBigBookAtom* bigBook = (morkBigBookAtom*) atom;
      outYarn->mYarn_Buf = bigBook->mBigBookAtom_Body;
      outYarn->mYarn_Fill = bigBook->mBigBookAtom_Size;
      outYarn->mYarn_Size = bigBook->mBigBookAtom_Size;
      outYarn->mYarn_Form = bigBook->mBigBookAtom_Form;
    }
    else if ( atom->IsWeeAnon() )
    {
      morkWeeAnonAtom* weeAnon = (morkWeeAnonAtom*) atom;
      outYarn->mYarn_Buf = weeAnon->mWeeAnonAtom_Body;
      outYarn->mYarn_Fill = weeAnon->mAtom_Size;
      outYarn->mYarn_Size = weeAnon->mAtom_Size;
    }
    else if ( atom->IsBigAnon() )
    {
      morkBigAnonAtom* bigAnon = (morkBigAnonAtom*) atom;
      outYarn->mYarn_Buf = bigAnon->mBigAnonAtom_Body;
      outYarn->mYarn_Fill = bigAnon->mBigAnonAtom_Size;
      outYarn->mYarn_Size = bigAnon->mBigAnonAtom_Size;
      outYarn->mYarn_Form = bigAnon->mBigAnonAtom_Form;
    }
    else
      atom = 0; // show desire to put empty content in yarn
  }
  
  if ( !atom ) // empty content for yarn?
  {
    outYarn->mYarn_Buf = 0;
    outYarn->mYarn_Fill = 0;
    outYarn->mYarn_Size = 0;
    // outYarn->mYarn_Grow = 0; // please don't modify the Grow slot
  }
  return ( atom != 0 );
}

mork_aid
morkAtom::GetBookAtomAid() const // zero or book atom's ID
{
  return ( this->IsBook() )? ((morkBookAtom*) this)->mBookAtom_Id : 0;
}

mork_scope
morkAtom::GetBookAtomSpaceScope(morkEnv* ev) const // zero or book's space's scope
{
  mork_scope outScope = 0;
  if ( this->IsBook() )
  {
    const morkBookAtom* bookAtom = (const morkBookAtom*) this;
    morkAtomSpace* space = bookAtom->mBookAtom_Space;
    if ( space->IsAtomSpace() )
      outScope = space->SpaceScope();
    else
      space->NonAtomSpaceTypeError(ev);
  }
  
  return outScope;
}

void
morkAtom::MakeCellUseForever(morkEnv* ev)
{
  MORK_USED_1(ev); 
  mAtom_CellUses = morkAtom_kForeverCellUses;
}

mork_u1
morkAtom::AddCellUse(morkEnv* ev)
{
  MORK_USED_1(ev); 
  if ( mAtom_CellUses < morkAtom_kMaxCellUses ) // not already maxed out?
    ++mAtom_CellUses;
    
  return mAtom_CellUses;
}

mork_u1
morkAtom::CutCellUse(morkEnv* ev)
{
  if ( mAtom_CellUses ) // any outstanding uses to cut?
  {
    if ( mAtom_CellUses < morkAtom_kMaxCellUses ) // not frozen at max?
      --mAtom_CellUses;
  }
  else
    this->CellUsesUnderflowWarning(ev);
    
  return mAtom_CellUses;
}

/*static*/ void
morkAtom::CellUsesUnderflowWarning(morkEnv* ev)
{
  ev->NewWarning("mAtom_CellUses underflow");
}

/*static*/ void
morkAtom::BadAtomKindError(morkEnv* ev)
{
  ev->NewError("bad mAtom_Kind");
}

/*static*/ void
morkAtom::ZeroAidError(morkEnv* ev)
{
  ev->NewError("zero atom ID");
}

/*static*/ void
morkAtom::AtomSizeOverflowError(morkEnv* ev)
{
  ev->NewError("atom mAtom_Size overflow");
}

void
morkOidAtom::InitRowOidAtom(morkEnv* ev, const mdbOid& inOid)
{
  MORK_USED_1(ev); 
  mAtom_CellUses = 0;
  mAtom_Kind = morkAtom_kKindRowOid;
  mAtom_Change = morkChange_kNil;
  mAtom_Size = 0;
  mOidAtom_Oid = inOid; // bitwise copy
}

void
morkOidAtom::InitTableOidAtom(morkEnv* ev, const mdbOid& inOid)
{
  MORK_USED_1(ev); 
  mAtom_CellUses = 0;
  mAtom_Kind = morkAtom_kKindTableOid;
  mAtom_Change = morkChange_kNil;
  mAtom_Size = 0;
  mOidAtom_Oid = inOid; // bitwise copy
}

void
morkWeeAnonAtom::InitWeeAnonAtom(morkEnv* ev, const morkBuf& inBuf)
{
  mAtom_Kind = 0;
  mAtom_Change = morkChange_kNil;
  if ( inBuf.mBuf_Fill <= morkAtom_kMaxByteSize )
  {
    mAtom_CellUses = 0;
    mAtom_Kind = morkAtom_kKindWeeAnon;
    mork_size size = inBuf.mBuf_Fill;
    mAtom_Size = (mork_u1) size;
    if ( size && inBuf.mBuf_Body )
      MORK_MEMCPY(mWeeAnonAtom_Body, inBuf.mBuf_Body, size);
        
    mWeeAnonAtom_Body[ size ] = 0;
  }
  else
    this->AtomSizeOverflowError(ev);
}

void
morkBigAnonAtom::InitBigAnonAtom(morkEnv* ev, const morkBuf& inBuf,
  mork_cscode inForm)
{
  MORK_USED_1(ev); 
  mAtom_CellUses = 0;
  mAtom_Kind = morkAtom_kKindBigAnon;
  mAtom_Change = morkChange_kNil;
  mAtom_Size = 0;
  mBigAnonAtom_Form = inForm;
  mork_size size = inBuf.mBuf_Fill;
  mBigAnonAtom_Size = size;
  if ( size && inBuf.mBuf_Body )
    MORK_MEMCPY(mBigAnonAtom_Body, inBuf.mBuf_Body, size);
        
  mBigAnonAtom_Body[ size ] = 0;
}

/*static*/ void
morkBookAtom::NonBookAtomTypeError(morkEnv* ev)
{
  ev->NewError("non morkBookAtom");
}

mork_u4
morkBookAtom::HashFormAndBody(morkEnv* ev) const
{
  // This hash is obviously a variation of the dragon book string hash.
  // (I won't bother to explain or rationalize this usage for you.)

  mork_u4 outHash = 0; // hash value returned
  unsigned char c; // next character
  const mork_u1* body; // body of bytes to hash
  mork_size size = 0; // the number of bytes to hash

  if ( this->IsWeeBook() )
  {
    size = mAtom_Size;
    body = ((const morkWeeBookAtom*) this)->mWeeBookAtom_Body;
  }
  else if ( this->IsBigBook() )
  {
    size = ((const morkBigBookAtom*) this)->mBigBookAtom_Size;
    body = ((const morkBigBookAtom*) this)->mBigBookAtom_Body;
  }
  else if ( this->IsFarBook() )
  {
    size = ((const morkFarBookAtom*) this)->mFarBookAtom_Size;
    body = ((const morkFarBookAtom*) this)->mFarBookAtom_Body;
  }
  else
  {
    this->NonBookAtomTypeError(ev);
    return 0;
  }
  
  const mork_u1* end = body + size;
  while ( body < end )
  {
    c = *body++;
    outHash <<= 4;
    outHash += c;
    mork_u4 top = outHash & 0xF0000000L; // top four bits
    if ( top ) // any of high four bits equal to one? 
    {
      outHash ^= (top >> 24); // fold down high bits
      outHash ^= top; // zero top four bits
    }
  }
    
  return outHash;
}

mork_bool
morkBookAtom::EqualFormAndBody(morkEnv* ev, const morkBookAtom* inAtom) const
{
  mork_bool outEqual = morkBool_kFalse;
  
  const mork_u1* body = 0; // body of inAtom bytes to compare
  mork_size size; // the number of inAtom bytes to compare
  mork_cscode form; // nominal charset for ioAtom

  if ( inAtom->IsWeeBook() )
  {
    size = inAtom->mAtom_Size;
    body = ((const morkWeeBookAtom*) inAtom)->mWeeBookAtom_Body;
    form = 0;
  }
  else if ( inAtom->IsBigBook() )
  {
    size = ((const morkBigBookAtom*) inAtom)->mBigBookAtom_Size;
    body = ((const morkBigBookAtom*) inAtom)->mBigBookAtom_Body;
    form = ((const morkBigBookAtom*) inAtom)->mBigBookAtom_Form;
  }
  else if ( inAtom->IsFarBook() )
  {
    size = ((const morkFarBookAtom*) inAtom)->mFarBookAtom_Size;
    body = ((const morkFarBookAtom*) inAtom)->mFarBookAtom_Body;
    form = ((const morkFarBookAtom*) inAtom)->mFarBookAtom_Form;
  }
  else
  {
    inAtom->NonBookAtomTypeError(ev);
    return morkBool_kFalse;
  }

  const mork_u1* thisBody = 0; // body of bytes in this to compare
  mork_size thisSize; // the number of bytes in this to compare
  mork_cscode thisForm; // nominal charset for this atom
  
  if ( this->IsWeeBook() )
  {
    thisSize = mAtom_Size;
    thisBody = ((const morkWeeBookAtom*) this)->mWeeBookAtom_Body;
    thisForm = 0;
  }
  else if ( this->IsBigBook() )
  {
    thisSize = ((const morkBigBookAtom*) this)->mBigBookAtom_Size;
    thisBody = ((const morkBigBookAtom*) this)->mBigBookAtom_Body;
    thisForm = ((const morkBigBookAtom*) this)->mBigBookAtom_Form;
  }
  else if ( this->IsFarBook() )
  {
    thisSize = ((const morkFarBookAtom*) this)->mFarBookAtom_Size;
    thisBody = ((const morkFarBookAtom*) this)->mFarBookAtom_Body;
    thisForm = ((const morkFarBookAtom*) this)->mFarBookAtom_Form;
  }
  else
  {
    this->NonBookAtomTypeError(ev);
    return morkBool_kFalse;
  }
  
  // if atoms are empty, form is irrelevant
  if ( body && thisBody && size == thisSize && (!size || form == thisForm ))
    outEqual = (MORK_MEMCMP(body, thisBody, size) == 0);
  
  return outEqual;
}


void
morkBookAtom::CutBookAtomFromSpace(morkEnv* ev)
{
  morkAtomSpace* space = mBookAtom_Space;
  if ( space )
  {
    mBookAtom_Space = 0;
    space->mAtomSpace_AtomBodies.CutAtom(ev, this);
    space->mAtomSpace_AtomAids.CutAtom(ev, this);
  }
  else
    ev->NilPointerError();
}

morkWeeBookAtom::morkWeeBookAtom(mork_aid inAid)
{
  mAtom_Kind = morkAtom_kKindWeeBook;
  mAtom_CellUses = 0;
  mAtom_Change = morkChange_kNil;
  mAtom_Size = 0;

  mBookAtom_Space = 0;
  mBookAtom_Id = inAid;

  mWeeBookAtom_Body[ 0 ] = 0;
}

void
morkWeeBookAtom::InitWeeBookAtom(morkEnv* ev, const morkBuf& inBuf,
  morkAtomSpace* ioSpace, mork_aid inAid)
{
  mAtom_Kind = 0;
  mAtom_Change = morkChange_kNil;
  if ( ioSpace )
  {
    if ( inAid )
    {
      if ( inBuf.mBuf_Fill <= morkAtom_kMaxByteSize )
      {
        mAtom_CellUses = 0;
        mAtom_Kind = morkAtom_kKindWeeBook;
        mBookAtom_Space = ioSpace;
        mBookAtom_Id = inAid;
        mork_size size = inBuf.mBuf_Fill;
        mAtom_Size = (mork_u1) size;
        if ( size && inBuf.mBuf_Body )
          MORK_MEMCPY(mWeeBookAtom_Body, inBuf.mBuf_Body, size);
        
        mWeeBookAtom_Body[ size ] = 0;
      }
      else
        this->AtomSizeOverflowError(ev);
    }
    else
      this->ZeroAidError(ev);
  }
  else
    ev->NilPointerError();
}

void
morkBigBookAtom::InitBigBookAtom(morkEnv* ev, const morkBuf& inBuf,
  mork_cscode inForm, morkAtomSpace* ioSpace, mork_aid inAid)
{
  mAtom_Kind = 0;
  mAtom_Change = morkChange_kNil;
  if ( ioSpace )
  {
    if ( inAid )
    {
      mAtom_CellUses = 0;
      mAtom_Kind = morkAtom_kKindBigBook;
      mAtom_Size = 0;
      mBookAtom_Space = ioSpace;
      mBookAtom_Id = inAid;
      mBigBookAtom_Form = inForm;
      mork_size size = inBuf.mBuf_Fill;
      mBigBookAtom_Size = size;
      if ( size && inBuf.mBuf_Body )
        MORK_MEMCPY(mBigBookAtom_Body, inBuf.mBuf_Body, size);
        
      mBigBookAtom_Body[ size ] = 0;
    }
    else
      this->ZeroAidError(ev);
  }
  else
    ev->NilPointerError();
}

void morkFarBookAtom::InitFarBookAtom(morkEnv* ev, const morkBuf& inBuf,
  mork_cscode inForm, morkAtomSpace* ioSpace, mork_aid inAid)
{
  mAtom_Kind = 0;
  mAtom_Change = morkChange_kNil;
  if ( ioSpace )
  {
    if ( inAid )
    {
      mAtom_CellUses = 0;
      mAtom_Kind = morkAtom_kKindFarBook;
      mAtom_Size = 0;
      mBookAtom_Space = ioSpace;
      mBookAtom_Id = inAid;
      mFarBookAtom_Form = inForm;
      mFarBookAtom_Size = inBuf.mBuf_Fill;
      mFarBookAtom_Body = (mork_u1*) inBuf.mBuf_Body;
    }
    else
      this->ZeroAidError(ev);
  }
  else
    ev->NilPointerError();
}

//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789