]>
Commit | Line | Data |
---|---|---|
878ddf1f | 1 | /*++\r |
2 | \r | |
3 | Copyright (c) 2004, Intel Corporation \r | |
4 | All rights reserved. This program and the accompanying materials \r | |
5 | are licensed and made available under the terms and conditions of the BSD License \r | |
6 | which accompanies this distribution. The full text of the license may be found at \r | |
7 | http://opensource.org/licenses/bsd-license.php \r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
11 | \r | |
12 | Module Name:\r | |
13 | \r | |
14 | EfiCompress.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | Compression routine. The compression algorithm is a mixture of\r | |
19 | LZ77 and Huffman coding. LZ77 transforms the source data into a\r | |
20 | sequence of Original Characters and Pointers to repeated strings.\r | |
21 | This sequence is further divided into Blocks and Huffman codings\r | |
22 | are applied to each Block.\r | |
23 | \r | |
24 | --*/\r | |
25 | \r | |
26 | /*\r | |
27 | #include "TianoCommon.h"\r | |
28 | */\r | |
29 | #include "EfiCompress.h"\r | |
30 | \r | |
31 | //\r | |
32 | // Macro Definitions\r | |
33 | //\r | |
34 | typedef INT32 NODE;\r | |
35 | #define UINT8_BIT 8\r | |
36 | #define THRESHOLD 3\r | |
37 | #define INIT_CRC 0\r | |
38 | #define WNDBIT 19\r | |
39 | #define WNDSIZ (1U << WNDBIT)\r | |
40 | #define MAXMATCH 256\r | |
41 | #define BLKSIZ (1U << 14) // 16 * 1024U\r | |
42 | #define PERC_FLAG 0x80000000U\r | |
43 | #define CODE_BIT 16\r | |
44 | #define NIL 0\r | |
45 | #define MAX_HASH_VAL (3 * WNDSIZ + (WNDSIZ / 512 + 1) * UINT8_MAX)\r | |
46 | #define HASH(p, c) ((p) + ((c) << (WNDBIT - 9)) + WNDSIZ * 2)\r | |
47 | #define CRCPOLY 0xA001\r | |
48 | #define UPDATE_CRC(c) mCrc = mCrcTable[(mCrc ^ (c)) & 0xFF] ^ (mCrc >> UINT8_BIT)\r | |
49 | \r | |
50 | //\r | |
51 | // C: the Char&Len Set; P: the Position Set; T: the exTra Set\r | |
52 | //\r | |
53 | #define NC (UINT8_MAX + MAXMATCH + 2 - THRESHOLD)\r | |
54 | #define CBIT 9\r | |
55 | #define NP (WNDBIT + 1)\r | |
56 | #define PBIT 5\r | |
57 | #define NT (CODE_BIT + 3)\r | |
58 | #define TBIT 5\r | |
59 | #if NT > NP\r | |
60 | #define NPT NT\r | |
61 | #else\r | |
62 | #define NPT NP\r | |
63 | #endif\r | |
64 | //\r | |
65 | // Function Prototypes\r | |
66 | //\r | |
67 | STATIC VOID PutDword(IN UINT32 Data);\r | |
68 | \r | |
69 | STATIC\r | |
70 | EFI_STATUS\r | |
71 | AllocateMemory (\r | |
72 | VOID\r | |
73 | );\r | |
74 | \r | |
75 | STATIC\r | |
76 | VOID\r | |
77 | FreeMemory (\r | |
78 | VOID\r | |
79 | );\r | |
80 | \r | |
81 | STATIC\r | |
82 | VOID\r | |
83 | InitSlide (\r | |
84 | VOID\r | |
85 | );\r | |
86 | \r | |
87 | STATIC\r | |
88 | NODE\r | |
89 | Child (\r | |
90 | IN NODE NodeQ,\r | |
91 | IN UINT8 CharC\r | |
92 | );\r | |
93 | \r | |
94 | STATIC\r | |
95 | VOID\r | |
96 | MakeChild (\r | |
97 | IN NODE NodeQ,\r | |
98 | IN UINT8 CharC,\r | |
99 | IN NODE NodeR\r | |
100 | );\r | |
101 | \r | |
102 | STATIC\r | |
103 | VOID\r | |
104 | Split (\r | |
105 | IN NODE Old\r | |
106 | );\r | |
107 | \r | |
108 | STATIC\r | |
109 | VOID\r | |
110 | InsertNode (\r | |
111 | VOID\r | |
112 | );\r | |
113 | \r | |
114 | STATIC\r | |
115 | VOID\r | |
116 | DeleteNode (\r | |
117 | VOID\r | |
118 | );\r | |
119 | \r | |
120 | STATIC\r | |
121 | VOID\r | |
122 | GetNextMatch (\r | |
123 | VOID\r | |
124 | );\r | |
125 | \r | |
126 | STATIC\r | |
127 | EFI_STATUS\r | |
128 | Encode (\r | |
129 | VOID\r | |
130 | );\r | |
131 | \r | |
132 | STATIC\r | |
133 | VOID\r | |
134 | CountTFreq (\r | |
135 | VOID\r | |
136 | );\r | |
137 | \r | |
138 | STATIC\r | |
139 | VOID\r | |
140 | WritePTLen (\r | |
141 | IN INT32 Number,\r | |
142 | IN INT32 nbit,\r | |
143 | IN INT32 Special\r | |
144 | );\r | |
145 | \r | |
146 | STATIC\r | |
147 | VOID\r | |
148 | WriteCLen (\r | |
149 | VOID\r | |
150 | );\r | |
151 | \r | |
152 | STATIC\r | |
153 | VOID\r | |
154 | EncodeC (\r | |
155 | IN INT32 Value\r | |
156 | );\r | |
157 | \r | |
158 | STATIC\r | |
159 | VOID\r | |
160 | EncodeP (\r | |
161 | IN UINT32 Value\r | |
162 | );\r | |
163 | \r | |
164 | STATIC\r | |
165 | VOID\r | |
166 | SendBlock (\r | |
167 | VOID\r | |
168 | );\r | |
169 | \r | |
170 | STATIC\r | |
171 | VOID\r | |
172 | Output (\r | |
173 | IN UINT32 c,\r | |
174 | IN UINT32 p\r | |
175 | );\r | |
176 | \r | |
177 | STATIC\r | |
178 | VOID\r | |
179 | HufEncodeStart (\r | |
180 | VOID\r | |
181 | );\r | |
182 | \r | |
183 | STATIC\r | |
184 | VOID\r | |
185 | HufEncodeEnd (\r | |
186 | VOID\r | |
187 | );\r | |
188 | \r | |
189 | STATIC\r | |
190 | VOID\r | |
191 | MakeCrcTable (\r | |
192 | VOID\r | |
193 | );\r | |
194 | \r | |
195 | STATIC\r | |
196 | VOID\r | |
197 | PutBits (\r | |
198 | IN INT32 Number,\r | |
199 | IN UINT32 Value\r | |
200 | );\r | |
201 | \r | |
202 | STATIC\r | |
203 | INT32\r | |
204 | FreadCrc (\r | |
205 | OUT UINT8 *Pointer,\r | |
206 | IN INT32 Number\r | |
207 | );\r | |
208 | \r | |
209 | STATIC\r | |
210 | VOID\r | |
211 | InitPutBits (\r | |
212 | VOID\r | |
213 | );\r | |
214 | \r | |
215 | STATIC\r | |
216 | VOID\r | |
217 | CountLen (\r | |
218 | IN INT32 Index\r | |
219 | );\r | |
220 | \r | |
221 | STATIC\r | |
222 | VOID\r | |
223 | MakeLen (\r | |
224 | IN INT32 Root\r | |
225 | );\r | |
226 | \r | |
227 | STATIC\r | |
228 | VOID\r | |
229 | DownHeap (\r | |
230 | IN INT32 Index\r | |
231 | );\r | |
232 | \r | |
233 | STATIC\r | |
234 | VOID\r | |
235 | MakeCode (\r | |
236 | IN INT32 Number,\r | |
237 | IN UINT8 Len[ ],\r | |
238 | OUT UINT16 Code[]\r | |
239 | );\r | |
240 | \r | |
241 | STATIC\r | |
242 | INT32\r | |
243 | MakeTree (\r | |
244 | IN INT32 NParm,\r | |
245 | IN UINT16 FreqParm[],\r | |
246 | OUT UINT8 LenParm[ ],\r | |
247 | OUT UINT16 CodeParm[]\r | |
248 | );\r | |
249 | \r | |
250 | //\r | |
251 | // Global Variables\r | |
252 | //\r | |
253 | static UINT8 *mSrc, *mDst, *mSrcUpperLimit, *mDstUpperLimit;\r | |
254 | \r | |
255 | static UINT8 *mLevel, *mText, *mChildCount, *mBuf, mCLen[NC], mPTLen[NPT], *mLen;\r | |
256 | static INT16 mHeap[NC + 1];\r | |
257 | static INT32 mRemainder, mMatchLen, mBitCount, mHeapSize, mN;\r | |
258 | static UINT32 mBufSiz = 0, mOutputPos, mOutputMask, mSubBitBuf, mCrc;\r | |
259 | static UINT32 mCompSize, mOrigSize;\r | |
260 | \r | |
261 | static UINT16 *mFreq, *mSortPtr, mLenCnt[17], mLeft[2 * NC - 1], mRight[2 * NC - 1], mCrcTable[UINT8_MAX + 1],\r | |
262 | mCFreq[2 * NC - 1], mCTable[4096], mCCode[NC], mPFreq[2 * NP - 1], mPTCode[NPT], mTFreq[2 * NT - 1];\r | |
263 | \r | |
264 | static NODE mPos, mMatchPos, mAvail, *mPosition, *mParent, *mPrev, *mNext = NULL;\r | |
265 | \r | |
266 | //\r | |
267 | // functions\r | |
268 | //\r | |
269 | EFI_STATUS\r | |
270 | Compress (\r | |
271 | IN UINT8 *SrcBuffer,\r | |
272 | IN UINT32 SrcSize,\r | |
273 | IN UINT8 *DstBuffer,\r | |
274 | IN OUT UINT32 *DstSize\r | |
275 | )\r | |
276 | /*++\r | |
277 | \r | |
278 | Routine Description:\r | |
279 | \r | |
280 | The main compression routine.\r | |
281 | \r | |
282 | Arguments:\r | |
283 | \r | |
284 | SrcBuffer - The buffer storing the source data\r | |
285 | SrcSize - The size of source data\r | |
286 | DstBuffer - The buffer to store the compressed data\r | |
287 | DstSize - On input, the size of DstBuffer; On output,\r | |
288 | the size of the actual compressed data.\r | |
289 | \r | |
290 | Returns:\r | |
291 | \r | |
292 | EFI_BUFFER_TOO_SMALL - The DstBuffer is too small. In this case,\r | |
293 | DstSize contains the size needed.\r | |
294 | EFI_SUCCESS - Compression is successful.\r | |
295 | EFI_OUT_OF_RESOURCES - No resource to complete function.\r | |
296 | \r | |
297 | --*/\r | |
298 | {\r | |
299 | EFI_STATUS Status;\r | |
300 | \r | |
301 | //\r | |
302 | // Initializations\r | |
303 | //\r | |
304 | mBufSiz = 0;\r | |
305 | mBuf = NULL;\r | |
306 | mText = NULL;\r | |
307 | mLevel = NULL;\r | |
308 | mChildCount = NULL;\r | |
309 | mPosition = NULL;\r | |
310 | mParent = NULL;\r | |
311 | mPrev = NULL;\r | |
312 | mNext = NULL;\r | |
313 | \r | |
314 | mSrc = SrcBuffer;\r | |
315 | mSrcUpperLimit = mSrc + SrcSize;\r | |
316 | mDst = DstBuffer;\r | |
317 | mDstUpperLimit = mDst +*DstSize;\r | |
318 | \r | |
319 | PutDword (0L);\r | |
320 | PutDword (0L);\r | |
321 | \r | |
322 | MakeCrcTable ();\r | |
323 | \r | |
324 | mOrigSize = mCompSize = 0;\r | |
325 | mCrc = INIT_CRC;\r | |
326 | \r | |
327 | //\r | |
328 | // Compress it\r | |
329 | //\r | |
330 | Status = Encode ();\r | |
331 | if (EFI_ERROR (Status)) {\r | |
332 | return EFI_OUT_OF_RESOURCES;\r | |
333 | }\r | |
334 | //\r | |
335 | // Null terminate the compressed data\r | |
336 | //\r | |
337 | if (mDst < mDstUpperLimit) {\r | |
338 | *mDst++ = 0;\r | |
339 | }\r | |
340 | //\r | |
341 | // Fill in compressed size and original size\r | |
342 | //\r | |
343 | mDst = DstBuffer;\r | |
344 | PutDword (mCompSize + 1);\r | |
345 | PutDword (mOrigSize);\r | |
346 | \r | |
347 | //\r | |
348 | // Return\r | |
349 | //\r | |
350 | if (mCompSize + 1 + 8 > *DstSize) {\r | |
351 | *DstSize = mCompSize + 1 + 8;\r | |
352 | return EFI_BUFFER_TOO_SMALL;\r | |
353 | } else {\r | |
354 | *DstSize = mCompSize + 1 + 8;\r | |
355 | return EFI_SUCCESS;\r | |
356 | }\r | |
357 | \r | |
358 | }\r | |
359 | \r | |
360 | STATIC\r | |
361 | VOID\r | |
362 | PutDword (\r | |
363 | IN UINT32 Data\r | |
364 | )\r | |
365 | /*++\r | |
366 | \r | |
367 | Routine Description:\r | |
368 | \r | |
369 | Put a dword to output stream\r | |
370 | \r | |
371 | Arguments:\r | |
372 | \r | |
373 | Data - the dword to put\r | |
374 | \r | |
375 | Returns: (VOID)\r | |
376 | \r | |
377 | --*/\r | |
378 | {\r | |
379 | if (mDst < mDstUpperLimit) {\r | |
380 | *mDst++ = (UINT8) (((UINT8) (Data)) & 0xff);\r | |
381 | }\r | |
382 | \r | |
383 | if (mDst < mDstUpperLimit) {\r | |
384 | *mDst++ = (UINT8) (((UINT8) (Data >> 0x08)) & 0xff);\r | |
385 | }\r | |
386 | \r | |
387 | if (mDst < mDstUpperLimit) {\r | |
388 | *mDst++ = (UINT8) (((UINT8) (Data >> 0x10)) & 0xff);\r | |
389 | }\r | |
390 | \r | |
391 | if (mDst < mDstUpperLimit) {\r | |
392 | *mDst++ = (UINT8) (((UINT8) (Data >> 0x18)) & 0xff);\r | |
393 | }\r | |
394 | }\r | |
395 | \r | |
396 | STATIC\r | |
397 | EFI_STATUS\r | |
398 | AllocateMemory (\r | |
399 | VOID\r | |
400 | )\r | |
401 | /*++\r | |
402 | \r | |
403 | Routine Description:\r | |
404 | \r | |
405 | Allocate memory spaces for data structures used in compression process\r | |
406 | \r | |
407 | Argements: \r | |
408 | VOID\r | |
409 | \r | |
410 | Returns:\r | |
411 | \r | |
412 | EFI_SUCCESS - Memory is allocated successfully\r | |
413 | EFI_OUT_OF_RESOURCES - Allocation fails\r | |
414 | \r | |
415 | --*/\r | |
416 | {\r | |
417 | UINT32 Index;\r | |
418 | \r | |
419 | mText = malloc (WNDSIZ * 2 + MAXMATCH);\r | |
420 | for (Index = 0; Index < WNDSIZ * 2 + MAXMATCH; Index++) {\r | |
421 | mText[Index] = 0;\r | |
422 | }\r | |
423 | \r | |
424 | mLevel = malloc ((WNDSIZ + UINT8_MAX + 1) * sizeof (*mLevel));\r | |
425 | mChildCount = malloc ((WNDSIZ + UINT8_MAX + 1) * sizeof (*mChildCount));\r | |
426 | mPosition = malloc ((WNDSIZ + UINT8_MAX + 1) * sizeof (*mPosition));\r | |
427 | mParent = malloc (WNDSIZ * 2 * sizeof (*mParent));\r | |
428 | mPrev = malloc (WNDSIZ * 2 * sizeof (*mPrev));\r | |
429 | mNext = malloc ((MAX_HASH_VAL + 1) * sizeof (*mNext));\r | |
430 | \r | |
431 | mBufSiz = BLKSIZ;\r | |
432 | mBuf = malloc (mBufSiz);\r | |
433 | while (mBuf == NULL) {\r | |
434 | mBufSiz = (mBufSiz / 10U) * 9U;\r | |
435 | if (mBufSiz < 4 * 1024U) {\r | |
436 | return EFI_OUT_OF_RESOURCES;\r | |
437 | }\r | |
438 | \r | |
439 | mBuf = malloc (mBufSiz);\r | |
440 | }\r | |
441 | \r | |
442 | mBuf[0] = 0;\r | |
443 | \r | |
444 | return EFI_SUCCESS;\r | |
445 | }\r | |
446 | \r | |
447 | VOID\r | |
448 | FreeMemory (\r | |
449 | VOID\r | |
450 | )\r | |
451 | /*++\r | |
452 | \r | |
453 | Routine Description:\r | |
454 | \r | |
455 | Called when compression is completed to free memory previously allocated.\r | |
456 | \r | |
457 | Arguments: (VOID)\r | |
458 | \r | |
459 | Returns: (VOID)\r | |
460 | \r | |
461 | --*/\r | |
462 | {\r | |
463 | if (mText != NULL) {\r | |
464 | free (mText);\r | |
465 | }\r | |
466 | \r | |
467 | if (mLevel != NULL) {\r | |
468 | free (mLevel);\r | |
469 | }\r | |
470 | \r | |
471 | if (mChildCount != NULL) {\r | |
472 | free (mChildCount);\r | |
473 | }\r | |
474 | \r | |
475 | if (mPosition != NULL) {\r | |
476 | free (mPosition);\r | |
477 | }\r | |
478 | \r | |
479 | if (mParent != NULL) {\r | |
480 | free (mParent);\r | |
481 | }\r | |
482 | \r | |
483 | if (mPrev != NULL) {\r | |
484 | free (mPrev);\r | |
485 | }\r | |
486 | \r | |
487 | if (mNext != NULL) {\r | |
488 | free (mNext);\r | |
489 | }\r | |
490 | \r | |
491 | if (mBuf != NULL) {\r | |
492 | free (mBuf);\r | |
493 | }\r | |
494 | \r | |
495 | return ;\r | |
496 | }\r | |
497 | \r | |
498 | STATIC\r | |
499 | VOID\r | |
500 | InitSlide (\r | |
501 | VOID\r | |
502 | )\r | |
503 | /*++\r | |
504 | \r | |
505 | Routine Description:\r | |
506 | \r | |
507 | Initialize String Info Log data structures\r | |
508 | \r | |
509 | Arguments: (VOID)\r | |
510 | \r | |
511 | Returns: (VOID)\r | |
512 | \r | |
513 | --*/\r | |
514 | {\r | |
515 | NODE Index;\r | |
516 | \r | |
517 | for (Index = WNDSIZ; Index <= WNDSIZ + UINT8_MAX; Index++) {\r | |
518 | mLevel[Index] = 1;\r | |
519 | mPosition[Index] = NIL; /* sentinel */\r | |
520 | }\r | |
521 | \r | |
522 | for (Index = WNDSIZ; Index < WNDSIZ * 2; Index++) {\r | |
523 | mParent[Index] = NIL;\r | |
524 | }\r | |
525 | \r | |
526 | mAvail = 1;\r | |
527 | for (Index = 1; Index < WNDSIZ - 1; Index++) {\r | |
528 | mNext[Index] = (NODE) (Index + 1);\r | |
529 | }\r | |
530 | \r | |
531 | mNext[WNDSIZ - 1] = NIL;\r | |
532 | for (Index = WNDSIZ * 2; Index <= MAX_HASH_VAL; Index++) {\r | |
533 | mNext[Index] = NIL;\r | |
534 | }\r | |
535 | }\r | |
536 | \r | |
537 | STATIC\r | |
538 | NODE\r | |
539 | Child (\r | |
540 | IN NODE NodeQ,\r | |
541 | IN UINT8 CharC\r | |
542 | )\r | |
543 | /*++\r | |
544 | \r | |
545 | Routine Description:\r | |
546 | \r | |
547 | Find child node given the parent node and the edge character\r | |
548 | \r | |
549 | Arguments:\r | |
550 | \r | |
551 | NodeQ - the parent node\r | |
552 | CharC - the edge character\r | |
553 | \r | |
554 | Returns:\r | |
555 | \r | |
556 | The child node (NIL if not found) \r | |
557 | \r | |
558 | --*/\r | |
559 | {\r | |
560 | NODE NodeR;\r | |
561 | \r | |
562 | NodeR = mNext[HASH (NodeQ, CharC)];\r | |
563 | //\r | |
564 | // sentinel\r | |
565 | //\r | |
566 | mParent[NIL] = NodeQ;\r | |
567 | while (mParent[NodeR] != NodeQ) {\r | |
568 | NodeR = mNext[NodeR];\r | |
569 | }\r | |
570 | \r | |
571 | return NodeR;\r | |
572 | }\r | |
573 | \r | |
574 | STATIC\r | |
575 | VOID\r | |
576 | MakeChild (\r | |
577 | IN NODE Parent,\r | |
578 | IN UINT8 CharC,\r | |
579 | IN NODE Child\r | |
580 | )\r | |
581 | /*++\r | |
582 | \r | |
583 | Routine Description:\r | |
584 | \r | |
585 | Create a new child for a given parent node.\r | |
586 | \r | |
587 | Arguments:\r | |
588 | \r | |
589 | Parent - the parent node\r | |
590 | CharC - the edge character\r | |
591 | Child - the child node\r | |
592 | \r | |
593 | Returns: (VOID)\r | |
594 | \r | |
595 | --*/\r | |
596 | {\r | |
597 | NODE Node1;\r | |
598 | NODE Node2;\r | |
599 | \r | |
600 | Node1 = (NODE) HASH (Parent, CharC);\r | |
601 | Node2 = mNext[Node1];\r | |
602 | mNext[Node1] = Child;\r | |
603 | mNext[Child] = Node2;\r | |
604 | mPrev[Node2] = Child;\r | |
605 | mPrev[Child] = Node1;\r | |
606 | mParent[Child] = Parent;\r | |
607 | mChildCount[Parent]++;\r | |
608 | }\r | |
609 | \r | |
610 | STATIC\r | |
611 | VOID\r | |
612 | Split (\r | |
613 | NODE Old\r | |
614 | )\r | |
615 | /*++\r | |
616 | \r | |
617 | Routine Description:\r | |
618 | \r | |
619 | Split a node.\r | |
620 | \r | |
621 | Arguments:\r | |
622 | \r | |
623 | Old - the node to split\r | |
624 | \r | |
625 | Returns: (VOID)\r | |
626 | \r | |
627 | --*/\r | |
628 | {\r | |
629 | NODE New;\r | |
630 | NODE TempNode;\r | |
631 | \r | |
632 | New = mAvail;\r | |
633 | mAvail = mNext[New];\r | |
634 | mChildCount[New] = 0;\r | |
635 | TempNode = mPrev[Old];\r | |
636 | mPrev[New] = TempNode;\r | |
637 | mNext[TempNode] = New;\r | |
638 | TempNode = mNext[Old];\r | |
639 | mNext[New] = TempNode;\r | |
640 | mPrev[TempNode] = New;\r | |
641 | mParent[New] = mParent[Old];\r | |
642 | mLevel[New] = (UINT8) mMatchLen;\r | |
643 | mPosition[New] = mPos;\r | |
644 | MakeChild (New, mText[mMatchPos + mMatchLen], Old);\r | |
645 | MakeChild (New, mText[mPos + mMatchLen], mPos);\r | |
646 | }\r | |
647 | \r | |
648 | STATIC\r | |
649 | VOID\r | |
650 | InsertNode (\r | |
651 | VOID\r | |
652 | )\r | |
653 | /*++\r | |
654 | \r | |
655 | Routine Description:\r | |
656 | \r | |
657 | Insert string info for current position into the String Info Log\r | |
658 | \r | |
659 | Arguments: (VOID)\r | |
660 | \r | |
661 | Returns: (VOID)\r | |
662 | \r | |
663 | --*/\r | |
664 | {\r | |
665 | NODE NodeQ;\r | |
666 | NODE NodeR;\r | |
667 | NODE Index2;\r | |
668 | NODE NodeT;\r | |
669 | UINT8 CharC;\r | |
670 | UINT8 *t1;\r | |
671 | UINT8 *t2;\r | |
672 | \r | |
673 | if (mMatchLen >= 4) {\r | |
674 | //\r | |
675 | // We have just got a long match, the target tree\r | |
676 | // can be located by MatchPos + 1. Travese the tree\r | |
677 | // from bottom up to get to a proper starting point.\r | |
678 | // The usage of PERC_FLAG ensures proper node deletion\r | |
679 | // in DeleteNode() later.\r | |
680 | //\r | |
681 | mMatchLen--;\r | |
682 | NodeR = (NODE) ((mMatchPos + 1) | WNDSIZ);\r | |
683 | NodeQ = mParent[NodeR];\r | |
684 | while (NodeQ == NIL) {\r | |
685 | NodeR = mNext[NodeR];\r | |
686 | NodeQ = mParent[NodeR];\r | |
687 | }\r | |
688 | \r | |
689 | while (mLevel[NodeQ] >= mMatchLen) {\r | |
690 | NodeR = NodeQ;\r | |
691 | NodeQ = mParent[NodeQ];\r | |
692 | }\r | |
693 | \r | |
694 | NodeT = NodeQ;\r | |
695 | while (mPosition[NodeT] < 0) {\r | |
696 | mPosition[NodeT] = mPos;\r | |
697 | NodeT = mParent[NodeT];\r | |
698 | }\r | |
699 | \r | |
700 | if (NodeT < WNDSIZ) {\r | |
701 | mPosition[NodeT] = (NODE) (mPos | (UINT32) PERC_FLAG);\r | |
702 | }\r | |
703 | } else {\r | |
704 | //\r | |
705 | // Locate the target tree\r | |
706 | //\r | |
707 | NodeQ = (NODE) (mText[mPos] + WNDSIZ);\r | |
708 | CharC = mText[mPos + 1];\r | |
709 | NodeR = Child (NodeQ, CharC);\r | |
710 | if (NodeR == NIL) {\r | |
711 | MakeChild (NodeQ, CharC, mPos);\r | |
712 | mMatchLen = 1;\r | |
713 | return ;\r | |
714 | }\r | |
715 | \r | |
716 | mMatchLen = 2;\r | |
717 | }\r | |
718 | //\r | |
719 | // Traverse down the tree to find a match.\r | |
720 | // Update Position value along the route.\r | |
721 | // Node split or creation is involved.\r | |
722 | //\r | |
723 | for (;;) {\r | |
724 | if (NodeR >= WNDSIZ) {\r | |
725 | Index2 = MAXMATCH;\r | |
726 | mMatchPos = NodeR;\r | |
727 | } else {\r | |
728 | Index2 = mLevel[NodeR];\r | |
729 | mMatchPos = (NODE) (mPosition[NodeR] & (UINT32)~PERC_FLAG);\r | |
730 | }\r | |
731 | \r | |
732 | if (mMatchPos >= mPos) {\r | |
733 | mMatchPos -= WNDSIZ;\r | |
734 | }\r | |
735 | \r | |
736 | t1 = &mText[mPos + mMatchLen];\r | |
737 | t2 = &mText[mMatchPos + mMatchLen];\r | |
738 | while (mMatchLen < Index2) {\r | |
739 | if (*t1 != *t2) {\r | |
740 | Split (NodeR);\r | |
741 | return ;\r | |
742 | }\r | |
743 | \r | |
744 | mMatchLen++;\r | |
745 | t1++;\r | |
746 | t2++;\r | |
747 | }\r | |
748 | \r | |
749 | if (mMatchLen >= MAXMATCH) {\r | |
750 | break;\r | |
751 | }\r | |
752 | \r | |
753 | mPosition[NodeR] = mPos;\r | |
754 | NodeQ = NodeR;\r | |
755 | NodeR = Child (NodeQ, *t1);\r | |
756 | if (NodeR == NIL) {\r | |
757 | MakeChild (NodeQ, *t1, mPos);\r | |
758 | return ;\r | |
759 | }\r | |
760 | \r | |
761 | mMatchLen++;\r | |
762 | }\r | |
763 | \r | |
764 | NodeT = mPrev[NodeR];\r | |
765 | mPrev[mPos] = NodeT;\r | |
766 | mNext[NodeT] = mPos;\r | |
767 | NodeT = mNext[NodeR];\r | |
768 | mNext[mPos] = NodeT;\r | |
769 | mPrev[NodeT] = mPos;\r | |
770 | mParent[mPos] = NodeQ;\r | |
771 | mParent[NodeR] = NIL;\r | |
772 | \r | |
773 | //\r | |
774 | // Special usage of 'next'\r | |
775 | //\r | |
776 | mNext[NodeR] = mPos;\r | |
777 | \r | |
778 | }\r | |
779 | \r | |
780 | STATIC\r | |
781 | VOID\r | |
782 | DeleteNode (\r | |
783 | VOID\r | |
784 | )\r | |
785 | /*++\r | |
786 | \r | |
787 | Routine Description:\r | |
788 | \r | |
789 | Delete outdated string info. (The Usage of PERC_FLAG\r | |
790 | ensures a clean deletion)\r | |
791 | \r | |
792 | Arguments: (VOID)\r | |
793 | \r | |
794 | Returns: (VOID)\r | |
795 | \r | |
796 | --*/\r | |
797 | {\r | |
798 | NODE NodeQ;\r | |
799 | NODE NodeR;\r | |
800 | NODE NodeS;\r | |
801 | NODE NodeT;\r | |
802 | NODE NodeU;\r | |
803 | \r | |
804 | if (mParent[mPos] == NIL) {\r | |
805 | return ;\r | |
806 | }\r | |
807 | \r | |
808 | NodeR = mPrev[mPos];\r | |
809 | NodeS = mNext[mPos];\r | |
810 | mNext[NodeR] = NodeS;\r | |
811 | mPrev[NodeS] = NodeR;\r | |
812 | NodeR = mParent[mPos];\r | |
813 | mParent[mPos] = NIL;\r | |
814 | if (NodeR >= WNDSIZ) {\r | |
815 | return ;\r | |
816 | }\r | |
817 | \r | |
818 | mChildCount[NodeR]--;\r | |
819 | if (mChildCount[NodeR] > 1) {\r | |
820 | return ;\r | |
821 | }\r | |
822 | \r | |
823 | NodeT = (NODE) (mPosition[NodeR] & (UINT32)~PERC_FLAG);\r | |
824 | if (NodeT >= mPos) {\r | |
825 | NodeT -= WNDSIZ;\r | |
826 | }\r | |
827 | \r | |
828 | NodeS = NodeT;\r | |
829 | NodeQ = mParent[NodeR];\r | |
830 | NodeU = mPosition[NodeQ];\r | |
831 | while (NodeU & (UINT32) PERC_FLAG) {\r | |
832 | NodeU &= (UINT32)~PERC_FLAG;\r | |
833 | if (NodeU >= mPos) {\r | |
834 | NodeU -= WNDSIZ;\r | |
835 | }\r | |
836 | \r | |
837 | if (NodeU > NodeS) {\r | |
838 | NodeS = NodeU;\r | |
839 | }\r | |
840 | \r | |
841 | mPosition[NodeQ] = (NODE) (NodeS | WNDSIZ);\r | |
842 | NodeQ = mParent[NodeQ];\r | |
843 | NodeU = mPosition[NodeQ];\r | |
844 | }\r | |
845 | \r | |
846 | if (NodeQ < WNDSIZ) {\r | |
847 | if (NodeU >= mPos) {\r | |
848 | NodeU -= WNDSIZ;\r | |
849 | }\r | |
850 | \r | |
851 | if (NodeU > NodeS) {\r | |
852 | NodeS = NodeU;\r | |
853 | }\r | |
854 | \r | |
855 | mPosition[NodeQ] = (NODE) (NodeS | WNDSIZ | (UINT32) PERC_FLAG);\r | |
856 | }\r | |
857 | \r | |
858 | NodeS = Child (NodeR, mText[NodeT + mLevel[NodeR]]);\r | |
859 | NodeT = mPrev[NodeS];\r | |
860 | NodeU = mNext[NodeS];\r | |
861 | mNext[NodeT] = NodeU;\r | |
862 | mPrev[NodeU] = NodeT;\r | |
863 | NodeT = mPrev[NodeR];\r | |
864 | mNext[NodeT] = NodeS;\r | |
865 | mPrev[NodeS] = NodeT;\r | |
866 | NodeT = mNext[NodeR];\r | |
867 | mPrev[NodeT] = NodeS;\r | |
868 | mNext[NodeS] = NodeT;\r | |
869 | mParent[NodeS] = mParent[NodeR];\r | |
870 | mParent[NodeR] = NIL;\r | |
871 | mNext[NodeR] = mAvail;\r | |
872 | mAvail = NodeR;\r | |
873 | }\r | |
874 | \r | |
875 | STATIC\r | |
876 | VOID\r | |
877 | GetNextMatch (\r | |
878 | VOID\r | |
879 | )\r | |
880 | /*++\r | |
881 | \r | |
882 | Routine Description:\r | |
883 | \r | |
884 | Advance the current position (read in new data if needed).\r | |
885 | Delete outdated string info. Find a match string for current position.\r | |
886 | \r | |
887 | Arguments: (VOID)\r | |
888 | \r | |
889 | Returns: (VOID)\r | |
890 | \r | |
891 | --*/\r | |
892 | {\r | |
893 | INT32 Number;\r | |
894 | \r | |
895 | mRemainder--;\r | |
896 | mPos++;\r | |
897 | if (mPos == WNDSIZ * 2) {\r | |
898 | memmove (&mText[0], &mText[WNDSIZ], WNDSIZ + MAXMATCH);\r | |
899 | Number = FreadCrc (&mText[WNDSIZ + MAXMATCH], WNDSIZ);\r | |
900 | mRemainder += Number;\r | |
901 | mPos = WNDSIZ;\r | |
902 | }\r | |
903 | \r | |
904 | DeleteNode ();\r | |
905 | InsertNode ();\r | |
906 | }\r | |
907 | \r | |
908 | STATIC\r | |
909 | EFI_STATUS\r | |
910 | Encode (\r | |
911 | VOID\r | |
912 | )\r | |
913 | /*++\r | |
914 | \r | |
915 | Routine Description:\r | |
916 | \r | |
917 | The main controlling routine for compression process.\r | |
918 | \r | |
919 | Arguments: (VOID)\r | |
920 | \r | |
921 | Returns:\r | |
922 | \r | |
923 | EFI_SUCCESS - The compression is successful\r | |
924 | EFI_OUT_0F_RESOURCES - Not enough memory for compression process\r | |
925 | \r | |
926 | --*/\r | |
927 | {\r | |
928 | EFI_STATUS Status;\r | |
929 | INT32 LastMatchLen;\r | |
930 | NODE LastMatchPos;\r | |
931 | \r | |
932 | Status = AllocateMemory ();\r | |
933 | if (EFI_ERROR (Status)) {\r | |
934 | FreeMemory ();\r | |
935 | return Status;\r | |
936 | }\r | |
937 | \r | |
938 | InitSlide ();\r | |
939 | \r | |
940 | HufEncodeStart ();\r | |
941 | \r | |
942 | mRemainder = FreadCrc (&mText[WNDSIZ], WNDSIZ + MAXMATCH);\r | |
943 | \r | |
944 | mMatchLen = 0;\r | |
945 | mPos = WNDSIZ;\r | |
946 | InsertNode ();\r | |
947 | if (mMatchLen > mRemainder) {\r | |
948 | mMatchLen = mRemainder;\r | |
949 | }\r | |
950 | \r | |
951 | while (mRemainder > 0) {\r | |
952 | LastMatchLen = mMatchLen;\r | |
953 | LastMatchPos = mMatchPos;\r | |
954 | GetNextMatch ();\r | |
955 | if (mMatchLen > mRemainder) {\r | |
956 | mMatchLen = mRemainder;\r | |
957 | }\r | |
958 | \r | |
959 | if (mMatchLen > LastMatchLen || LastMatchLen < THRESHOLD) {\r | |
960 | //\r | |
961 | // Not enough benefits are gained by outputting a pointer,\r | |
962 | // so just output the original character\r | |
963 | //\r | |
964 | Output (mText[mPos - 1], 0);\r | |
965 | \r | |
966 | } else {\r | |
967 | \r | |
968 | if (LastMatchLen == THRESHOLD) {\r | |
969 | if (((mPos - LastMatchPos - 2) & (WNDSIZ - 1)) > (1U << 11)) {\r | |
970 | Output (mText[mPos - 1], 0);\r | |
971 | continue;\r | |
972 | }\r | |
973 | }\r | |
974 | //\r | |
975 | // Outputting a pointer is beneficial enough, do it.\r | |
976 | //\r | |
977 | Output (\r | |
978 | LastMatchLen + (UINT8_MAX + 1 - THRESHOLD),\r | |
979 | (mPos - LastMatchPos - 2) & (WNDSIZ - 1)\r | |
980 | );\r | |
981 | LastMatchLen--;\r | |
982 | while (LastMatchLen > 0) {\r | |
983 | GetNextMatch ();\r | |
984 | LastMatchLen--;\r | |
985 | }\r | |
986 | \r | |
987 | if (mMatchLen > mRemainder) {\r | |
988 | mMatchLen = mRemainder;\r | |
989 | }\r | |
990 | }\r | |
991 | }\r | |
992 | \r | |
993 | HufEncodeEnd ();\r | |
994 | FreeMemory ();\r | |
995 | return EFI_SUCCESS;\r | |
996 | }\r | |
997 | \r | |
998 | STATIC\r | |
999 | VOID\r | |
1000 | CountTFreq (\r | |
1001 | VOID\r | |
1002 | )\r | |
1003 | /*++\r | |
1004 | \r | |
1005 | Routine Description:\r | |
1006 | \r | |
1007 | Count the frequencies for the Extra Set\r | |
1008 | \r | |
1009 | Arguments: (VOID)\r | |
1010 | \r | |
1011 | Returns: (VOID)\r | |
1012 | \r | |
1013 | --*/\r | |
1014 | {\r | |
1015 | INT32 Index;\r | |
1016 | INT32 Index3;\r | |
1017 | INT32 Number;\r | |
1018 | INT32 Count;\r | |
1019 | \r | |
1020 | for (Index = 0; Index < NT; Index++) {\r | |
1021 | mTFreq[Index] = 0;\r | |
1022 | }\r | |
1023 | \r | |
1024 | Number = NC;\r | |
1025 | while (Number > 0 && mCLen[Number - 1] == 0) {\r | |
1026 | Number--;\r | |
1027 | }\r | |
1028 | \r | |
1029 | Index = 0;\r | |
1030 | while (Index < Number) {\r | |
1031 | Index3 = mCLen[Index++];\r | |
1032 | if (Index3 == 0) {\r | |
1033 | Count = 1;\r | |
1034 | while (Index < Number && mCLen[Index] == 0) {\r | |
1035 | Index++;\r | |
1036 | Count++;\r | |
1037 | }\r | |
1038 | \r | |
1039 | if (Count <= 2) {\r | |
1040 | mTFreq[0] = (UINT16) (mTFreq[0] + Count);\r | |
1041 | } else if (Count <= 18) {\r | |
1042 | mTFreq[1]++;\r | |
1043 | } else if (Count == 19) {\r | |
1044 | mTFreq[0]++;\r | |
1045 | mTFreq[1]++;\r | |
1046 | } else {\r | |
1047 | mTFreq[2]++;\r | |
1048 | }\r | |
1049 | } else {\r | |
1050 | mTFreq[Index3 + 2]++;\r | |
1051 | }\r | |
1052 | }\r | |
1053 | }\r | |
1054 | \r | |
1055 | STATIC\r | |
1056 | VOID\r | |
1057 | WritePTLen (\r | |
1058 | IN INT32 Number,\r | |
1059 | IN INT32 nbit,\r | |
1060 | IN INT32 Special\r | |
1061 | )\r | |
1062 | /*++\r | |
1063 | \r | |
1064 | Routine Description:\r | |
1065 | \r | |
1066 | Outputs the code length array for the Extra Set or the Position Set.\r | |
1067 | \r | |
1068 | Arguments:\r | |
1069 | \r | |
1070 | Number - the number of symbols\r | |
1071 | nbit - the number of bits needed to represent 'n'\r | |
1072 | Special - the special symbol that needs to be take care of\r | |
1073 | \r | |
1074 | Returns: (VOID)\r | |
1075 | \r | |
1076 | --*/\r | |
1077 | {\r | |
1078 | INT32 Index;\r | |
1079 | INT32 Index3;\r | |
1080 | \r | |
1081 | while (Number > 0 && mPTLen[Number - 1] == 0) {\r | |
1082 | Number--;\r | |
1083 | }\r | |
1084 | \r | |
1085 | PutBits (nbit, Number);\r | |
1086 | Index = 0;\r | |
1087 | while (Index < Number) {\r | |
1088 | Index3 = mPTLen[Index++];\r | |
1089 | if (Index3 <= 6) {\r | |
1090 | PutBits (3, Index3);\r | |
1091 | } else {\r | |
1092 | PutBits (Index3 - 3, (1U << (Index3 - 3)) - 2);\r | |
1093 | }\r | |
1094 | \r | |
1095 | if (Index == Special) {\r | |
1096 | while (Index < 6 && mPTLen[Index] == 0) {\r | |
1097 | Index++;\r | |
1098 | }\r | |
1099 | \r | |
1100 | PutBits (2, (Index - 3) & 3);\r | |
1101 | }\r | |
1102 | }\r | |
1103 | }\r | |
1104 | \r | |
1105 | STATIC\r | |
1106 | VOID\r | |
1107 | WriteCLen (\r | |
1108 | VOID\r | |
1109 | )\r | |
1110 | /*++\r | |
1111 | \r | |
1112 | Routine Description:\r | |
1113 | \r | |
1114 | Outputs the code length array for Char&Length Set\r | |
1115 | \r | |
1116 | Arguments: (VOID)\r | |
1117 | \r | |
1118 | Returns: (VOID)\r | |
1119 | \r | |
1120 | --*/\r | |
1121 | {\r | |
1122 | INT32 Index;\r | |
1123 | INT32 Index3;\r | |
1124 | INT32 Number;\r | |
1125 | INT32 Count;\r | |
1126 | \r | |
1127 | Number = NC;\r | |
1128 | while (Number > 0 && mCLen[Number - 1] == 0) {\r | |
1129 | Number--;\r | |
1130 | }\r | |
1131 | \r | |
1132 | PutBits (CBIT, Number);\r | |
1133 | Index = 0;\r | |
1134 | while (Index < Number) {\r | |
1135 | Index3 = mCLen[Index++];\r | |
1136 | if (Index3 == 0) {\r | |
1137 | Count = 1;\r | |
1138 | while (Index < Number && mCLen[Index] == 0) {\r | |
1139 | Index++;\r | |
1140 | Count++;\r | |
1141 | }\r | |
1142 | \r | |
1143 | if (Count <= 2) {\r | |
1144 | for (Index3 = 0; Index3 < Count; Index3++) {\r | |
1145 | PutBits (mPTLen[0], mPTCode[0]);\r | |
1146 | }\r | |
1147 | } else if (Count <= 18) {\r | |
1148 | PutBits (mPTLen[1], mPTCode[1]);\r | |
1149 | PutBits (4, Count - 3);\r | |
1150 | } else if (Count == 19) {\r | |
1151 | PutBits (mPTLen[0], mPTCode[0]);\r | |
1152 | PutBits (mPTLen[1], mPTCode[1]);\r | |
1153 | PutBits (4, 15);\r | |
1154 | } else {\r | |
1155 | PutBits (mPTLen[2], mPTCode[2]);\r | |
1156 | PutBits (CBIT, Count - 20);\r | |
1157 | }\r | |
1158 | } else {\r | |
1159 | PutBits (mPTLen[Index3 + 2], mPTCode[Index3 + 2]);\r | |
1160 | }\r | |
1161 | }\r | |
1162 | }\r | |
1163 | \r | |
1164 | STATIC\r | |
1165 | VOID\r | |
1166 | EncodeC (\r | |
1167 | IN INT32 Value\r | |
1168 | )\r | |
1169 | {\r | |
1170 | PutBits (mCLen[Value], mCCode[Value]);\r | |
1171 | }\r | |
1172 | \r | |
1173 | STATIC\r | |
1174 | VOID\r | |
1175 | EncodeP (\r | |
1176 | IN UINT32 Value\r | |
1177 | )\r | |
1178 | {\r | |
1179 | UINT32 Index;\r | |
1180 | UINT32 NodeQ;\r | |
1181 | \r | |
1182 | Index = 0;\r | |
1183 | NodeQ = Value;\r | |
1184 | while (NodeQ) {\r | |
1185 | NodeQ >>= 1;\r | |
1186 | Index++;\r | |
1187 | }\r | |
1188 | \r | |
1189 | PutBits (mPTLen[Index], mPTCode[Index]);\r | |
1190 | if (Index > 1) {\r | |
1191 | PutBits (Index - 1, Value & (0xFFFFFFFFU >> (32 - Index + 1)));\r | |
1192 | }\r | |
1193 | }\r | |
1194 | \r | |
1195 | STATIC\r | |
1196 | VOID\r | |
1197 | SendBlock (\r | |
1198 | VOID\r | |
1199 | )\r | |
1200 | /*++\r | |
1201 | \r | |
1202 | Routine Description:\r | |
1203 | \r | |
1204 | Huffman code the block and output it.\r | |
1205 | \r | |
1206 | Arguments: \r | |
1207 | (VOID)\r | |
1208 | \r | |
1209 | Returns: \r | |
1210 | (VOID)\r | |
1211 | \r | |
1212 | --*/\r | |
1213 | {\r | |
1214 | UINT32 Index;\r | |
1215 | UINT32 Index2;\r | |
1216 | UINT32 Index3;\r | |
1217 | UINT32 Flags;\r | |
1218 | UINT32 Root;\r | |
1219 | UINT32 Pos;\r | |
1220 | UINT32 Size;\r | |
1221 | Flags = 0;\r | |
1222 | \r | |
1223 | Root = MakeTree (NC, mCFreq, mCLen, mCCode);\r | |
1224 | Size = mCFreq[Root];\r | |
1225 | PutBits (16, Size);\r | |
1226 | if (Root >= NC) {\r | |
1227 | CountTFreq ();\r | |
1228 | Root = MakeTree (NT, mTFreq, mPTLen, mPTCode);\r | |
1229 | if (Root >= NT) {\r | |
1230 | WritePTLen (NT, TBIT, 3);\r | |
1231 | } else {\r | |
1232 | PutBits (TBIT, 0);\r | |
1233 | PutBits (TBIT, Root);\r | |
1234 | }\r | |
1235 | \r | |
1236 | WriteCLen ();\r | |
1237 | } else {\r | |
1238 | PutBits (TBIT, 0);\r | |
1239 | PutBits (TBIT, 0);\r | |
1240 | PutBits (CBIT, 0);\r | |
1241 | PutBits (CBIT, Root);\r | |
1242 | }\r | |
1243 | \r | |
1244 | Root = MakeTree (NP, mPFreq, mPTLen, mPTCode);\r | |
1245 | if (Root >= NP) {\r | |
1246 | WritePTLen (NP, PBIT, -1);\r | |
1247 | } else {\r | |
1248 | PutBits (PBIT, 0);\r | |
1249 | PutBits (PBIT, Root);\r | |
1250 | }\r | |
1251 | \r | |
1252 | Pos = 0;\r | |
1253 | for (Index = 0; Index < Size; Index++) {\r | |
1254 | if (Index % UINT8_BIT == 0) {\r | |
1255 | Flags = mBuf[Pos++];\r | |
1256 | } else {\r | |
1257 | Flags <<= 1;\r | |
1258 | }\r | |
1259 | \r | |
1260 | if (Flags & (1U << (UINT8_BIT - 1))) {\r | |
1261 | EncodeC (mBuf[Pos++] + (1U << UINT8_BIT));\r | |
1262 | Index3 = mBuf[Pos++];\r | |
1263 | for (Index2 = 0; Index2 < 3; Index2++) {\r | |
1264 | Index3 <<= UINT8_BIT;\r | |
1265 | Index3 += mBuf[Pos++];\r | |
1266 | }\r | |
1267 | \r | |
1268 | EncodeP (Index3);\r | |
1269 | } else {\r | |
1270 | EncodeC (mBuf[Pos++]);\r | |
1271 | }\r | |
1272 | }\r | |
1273 | \r | |
1274 | for (Index = 0; Index < NC; Index++) {\r | |
1275 | mCFreq[Index] = 0;\r | |
1276 | }\r | |
1277 | \r | |
1278 | for (Index = 0; Index < NP; Index++) {\r | |
1279 | mPFreq[Index] = 0;\r | |
1280 | }\r | |
1281 | }\r | |
1282 | \r | |
1283 | STATIC\r | |
1284 | VOID\r | |
1285 | Output (\r | |
1286 | IN UINT32 CharC,\r | |
1287 | IN UINT32 Pos\r | |
1288 | )\r | |
1289 | /*++\r | |
1290 | \r | |
1291 | Routine Description:\r | |
1292 | \r | |
1293 | Outputs an Original Character or a Pointer\r | |
1294 | \r | |
1295 | Arguments:\r | |
1296 | \r | |
1297 | CharC - The original character or the 'String Length' element of a Pointer\r | |
1298 | Pos - The 'Position' field of a Pointer\r | |
1299 | \r | |
1300 | Returns: (VOID)\r | |
1301 | \r | |
1302 | --*/\r | |
1303 | {\r | |
1304 | static UINT32 CPos;\r | |
1305 | \r | |
1306 | if ((mOutputMask >>= 1) == 0) {\r | |
1307 | mOutputMask = 1U << (UINT8_BIT - 1);\r | |
1308 | //\r | |
1309 | // Check the buffer overflow per outputing UINT8_BIT symbols\r | |
1310 | // which is an Original Character or a Pointer. The biggest\r | |
1311 | // symbol is a Pointer which occupies 5 bytes.\r | |
1312 | //\r | |
1313 | if (mOutputPos >= mBufSiz - 5 * UINT8_BIT) {\r | |
1314 | SendBlock ();\r | |
1315 | mOutputPos = 0;\r | |
1316 | }\r | |
1317 | \r | |
1318 | CPos = mOutputPos++;\r | |
1319 | mBuf[CPos] = 0;\r | |
1320 | }\r | |
1321 | \r | |
1322 | mBuf[mOutputPos++] = (UINT8) CharC;\r | |
1323 | mCFreq[CharC]++;\r | |
1324 | if (CharC >= (1U << UINT8_BIT)) {\r | |
1325 | mBuf[CPos] |= mOutputMask;\r | |
1326 | mBuf[mOutputPos++] = (UINT8) (Pos >> 24);\r | |
1327 | mBuf[mOutputPos++] = (UINT8) (Pos >> 16);\r | |
1328 | mBuf[mOutputPos++] = (UINT8) (Pos >> (UINT8_BIT));\r | |
1329 | mBuf[mOutputPos++] = (UINT8) Pos;\r | |
1330 | CharC = 0;\r | |
1331 | while (Pos) {\r | |
1332 | Pos >>= 1;\r | |
1333 | CharC++;\r | |
1334 | }\r | |
1335 | \r | |
1336 | mPFreq[CharC]++;\r | |
1337 | }\r | |
1338 | }\r | |
1339 | \r | |
1340 | STATIC\r | |
1341 | VOID\r | |
1342 | HufEncodeStart (\r | |
1343 | VOID\r | |
1344 | )\r | |
1345 | {\r | |
1346 | INT32 Index;\r | |
1347 | \r | |
1348 | for (Index = 0; Index < NC; Index++) {\r | |
1349 | mCFreq[Index] = 0;\r | |
1350 | }\r | |
1351 | \r | |
1352 | for (Index = 0; Index < NP; Index++) {\r | |
1353 | mPFreq[Index] = 0;\r | |
1354 | }\r | |
1355 | \r | |
1356 | mOutputPos = mOutputMask = 0;\r | |
1357 | InitPutBits ();\r | |
1358 | return ;\r | |
1359 | }\r | |
1360 | \r | |
1361 | STATIC\r | |
1362 | VOID\r | |
1363 | HufEncodeEnd (\r | |
1364 | VOID\r | |
1365 | )\r | |
1366 | {\r | |
1367 | SendBlock ();\r | |
1368 | \r | |
1369 | //\r | |
1370 | // Flush remaining bits\r | |
1371 | //\r | |
1372 | PutBits (UINT8_BIT - 1, 0);\r | |
1373 | \r | |
1374 | return ;\r | |
1375 | }\r | |
1376 | \r | |
1377 | STATIC\r | |
1378 | VOID\r | |
1379 | MakeCrcTable (\r | |
1380 | VOID\r | |
1381 | )\r | |
1382 | {\r | |
1383 | UINT32 Index;\r | |
1384 | UINT32 Index2;\r | |
1385 | UINT32 Temp;\r | |
1386 | \r | |
1387 | for (Index = 0; Index <= UINT8_MAX; Index++) {\r | |
1388 | Temp = Index;\r | |
1389 | for (Index2 = 0; Index2 < UINT8_BIT; Index2++) {\r | |
1390 | if (Temp & 1) {\r | |
1391 | Temp = (Temp >> 1) ^ CRCPOLY;\r | |
1392 | } else {\r | |
1393 | Temp >>= 1;\r | |
1394 | }\r | |
1395 | }\r | |
1396 | \r | |
1397 | mCrcTable[Index] = (UINT16) Temp;\r | |
1398 | }\r | |
1399 | }\r | |
1400 | \r | |
1401 | STATIC\r | |
1402 | VOID\r | |
1403 | PutBits (\r | |
1404 | IN INT32 Number,\r | |
1405 | IN UINT32 Value\r | |
1406 | )\r | |
1407 | /*++\r | |
1408 | \r | |
1409 | Routine Description:\r | |
1410 | \r | |
1411 | Outputs rightmost n bits of x\r | |
1412 | \r | |
1413 | Arguments:\r | |
1414 | \r | |
1415 | Number - the rightmost n bits of the data is used\r | |
1416 | x - the data \r | |
1417 | \r | |
1418 | Returns: (VOID)\r | |
1419 | \r | |
1420 | --*/\r | |
1421 | {\r | |
1422 | UINT8 Temp;\r | |
1423 | \r | |
1424 | while (Number >= mBitCount) {\r | |
1425 | //\r | |
1426 | // Number -= mBitCount should never equal to 32\r | |
1427 | //\r | |
1428 | Temp = (UINT8) (mSubBitBuf | (Value >> (Number -= mBitCount)));\r | |
1429 | if (mDst < mDstUpperLimit) {\r | |
1430 | *mDst++ = Temp;\r | |
1431 | }\r | |
1432 | \r | |
1433 | mCompSize++;\r | |
1434 | mSubBitBuf = 0;\r | |
1435 | mBitCount = UINT8_BIT;\r | |
1436 | }\r | |
1437 | \r | |
1438 | mSubBitBuf |= Value << (mBitCount -= Number);\r | |
1439 | }\r | |
1440 | \r | |
1441 | STATIC\r | |
1442 | INT32\r | |
1443 | FreadCrc (\r | |
1444 | OUT UINT8 *Pointer,\r | |
1445 | IN INT32 Number\r | |
1446 | )\r | |
1447 | /*++\r | |
1448 | \r | |
1449 | Routine Description:\r | |
1450 | \r | |
1451 | Read in source data\r | |
1452 | \r | |
1453 | Arguments:\r | |
1454 | \r | |
1455 | Pointer - the buffer to hold the data\r | |
1456 | Number - number of bytes to read\r | |
1457 | \r | |
1458 | Returns:\r | |
1459 | \r | |
1460 | number of bytes actually read\r | |
1461 | \r | |
1462 | --*/\r | |
1463 | {\r | |
1464 | INT32 Index;\r | |
1465 | \r | |
1466 | for (Index = 0; mSrc < mSrcUpperLimit && Index < Number; Index++) {\r | |
1467 | *Pointer++ = *mSrc++;\r | |
1468 | }\r | |
1469 | \r | |
1470 | Number = Index;\r | |
1471 | \r | |
1472 | Pointer -= Number;\r | |
1473 | mOrigSize += Number;\r | |
1474 | Index--;\r | |
1475 | while (Index >= 0) {\r | |
1476 | UPDATE_CRC (*Pointer++);\r | |
1477 | Index--;\r | |
1478 | }\r | |
1479 | \r | |
1480 | return Number;\r | |
1481 | }\r | |
1482 | \r | |
1483 | STATIC\r | |
1484 | VOID\r | |
1485 | InitPutBits (\r | |
1486 | VOID\r | |
1487 | )\r | |
1488 | {\r | |
1489 | mBitCount = UINT8_BIT;\r | |
1490 | mSubBitBuf = 0;\r | |
1491 | }\r | |
1492 | \r | |
1493 | STATIC\r | |
1494 | VOID\r | |
1495 | CountLen (\r | |
1496 | IN INT32 Index\r | |
1497 | )\r | |
1498 | /*++\r | |
1499 | \r | |
1500 | Routine Description:\r | |
1501 | \r | |
1502 | Count the number of each code length for a Huffman tree.\r | |
1503 | \r | |
1504 | Arguments:\r | |
1505 | \r | |
1506 | Index - the top node\r | |
1507 | \r | |
1508 | Returns: (VOID)\r | |
1509 | \r | |
1510 | --*/\r | |
1511 | {\r | |
1512 | static INT32 Depth = 0;\r | |
1513 | \r | |
1514 | if (Index < mN) {\r | |
1515 | mLenCnt[(Depth < 16) ? Depth : 16]++;\r | |
1516 | } else {\r | |
1517 | Depth++;\r | |
1518 | CountLen (mLeft[Index]);\r | |
1519 | CountLen (mRight[Index]);\r | |
1520 | Depth--;\r | |
1521 | }\r | |
1522 | }\r | |
1523 | \r | |
1524 | STATIC\r | |
1525 | VOID\r | |
1526 | MakeLen (\r | |
1527 | IN INT32 Root\r | |
1528 | )\r | |
1529 | /*++\r | |
1530 | \r | |
1531 | Routine Description:\r | |
1532 | \r | |
1533 | Create code length array for a Huffman tree\r | |
1534 | \r | |
1535 | Arguments:\r | |
1536 | \r | |
1537 | Root - the root of the tree\r | |
1538 | \r | |
1539 | Returns:\r | |
1540 | \r | |
1541 | VOID\r | |
1542 | \r | |
1543 | --*/\r | |
1544 | {\r | |
1545 | INT32 Index;\r | |
1546 | INT32 Index3;\r | |
1547 | UINT32 Cum;\r | |
1548 | \r | |
1549 | for (Index = 0; Index <= 16; Index++) {\r | |
1550 | mLenCnt[Index] = 0;\r | |
1551 | }\r | |
1552 | \r | |
1553 | CountLen (Root);\r | |
1554 | \r | |
1555 | //\r | |
1556 | // Adjust the length count array so that\r | |
1557 | // no code will be generated longer than its designated length\r | |
1558 | //\r | |
1559 | Cum = 0;\r | |
1560 | for (Index = 16; Index > 0; Index--) {\r | |
1561 | Cum += mLenCnt[Index] << (16 - Index);\r | |
1562 | }\r | |
1563 | \r | |
1564 | while (Cum != (1U << 16)) {\r | |
1565 | mLenCnt[16]--;\r | |
1566 | for (Index = 15; Index > 0; Index--) {\r | |
1567 | if (mLenCnt[Index] != 0) {\r | |
1568 | mLenCnt[Index]--;\r | |
1569 | mLenCnt[Index + 1] += 2;\r | |
1570 | break;\r | |
1571 | }\r | |
1572 | }\r | |
1573 | \r | |
1574 | Cum--;\r | |
1575 | }\r | |
1576 | \r | |
1577 | for (Index = 16; Index > 0; Index--) {\r | |
1578 | Index3 = mLenCnt[Index];\r | |
1579 | Index3--;\r | |
1580 | while (Index3 >= 0) {\r | |
1581 | mLen[*mSortPtr++] = (UINT8) Index;\r | |
1582 | Index3--;\r | |
1583 | }\r | |
1584 | }\r | |
1585 | }\r | |
1586 | \r | |
1587 | STATIC\r | |
1588 | VOID\r | |
1589 | DownHeap (\r | |
1590 | IN INT32 Index\r | |
1591 | )\r | |
1592 | {\r | |
1593 | INT32 Index2;\r | |
1594 | INT32 Index3;\r | |
1595 | \r | |
1596 | //\r | |
1597 | // priority queue: send Index-th entry down heap\r | |
1598 | //\r | |
1599 | Index3 = mHeap[Index];\r | |
1600 | Index2 = 2 * Index;\r | |
1601 | while (Index2 <= mHeapSize) {\r | |
1602 | if (Index2 < mHeapSize && mFreq[mHeap[Index2]] > mFreq[mHeap[Index2 + 1]]) {\r | |
1603 | Index2++;\r | |
1604 | }\r | |
1605 | \r | |
1606 | if (mFreq[Index3] <= mFreq[mHeap[Index2]]) {\r | |
1607 | break;\r | |
1608 | }\r | |
1609 | \r | |
1610 | mHeap[Index] = mHeap[Index2];\r | |
1611 | Index = Index2;\r | |
1612 | Index2 = 2 * Index;\r | |
1613 | }\r | |
1614 | \r | |
1615 | mHeap[Index] = (INT16) Index3;\r | |
1616 | }\r | |
1617 | \r | |
1618 | STATIC\r | |
1619 | VOID\r | |
1620 | MakeCode (\r | |
1621 | IN INT32 Number,\r | |
1622 | IN UINT8 Len[ ],\r | |
1623 | OUT UINT16 Code[]\r | |
1624 | )\r | |
1625 | /*++\r | |
1626 | \r | |
1627 | Routine Description:\r | |
1628 | \r | |
1629 | Assign code to each symbol based on the code length array\r | |
1630 | \r | |
1631 | Arguments:\r | |
1632 | \r | |
1633 | Number - number of symbols\r | |
1634 | Len - the code length array\r | |
1635 | Code - stores codes for each symbol\r | |
1636 | \r | |
1637 | Returns: (VOID)\r | |
1638 | \r | |
1639 | --*/\r | |
1640 | {\r | |
1641 | INT32 Index;\r | |
1642 | UINT16 Start[18];\r | |
1643 | \r | |
1644 | Start[1] = 0;\r | |
1645 | for (Index = 1; Index <= 16; Index++) {\r | |
1646 | Start[Index + 1] = (UINT16) ((Start[Index] + mLenCnt[Index]) << 1);\r | |
1647 | }\r | |
1648 | \r | |
1649 | for (Index = 0; Index < Number; Index++) {\r | |
1650 | Code[Index] = Start[Len[Index]]++;\r | |
1651 | }\r | |
1652 | }\r | |
1653 | \r | |
1654 | STATIC\r | |
1655 | INT32\r | |
1656 | MakeTree (\r | |
1657 | IN INT32 NParm,\r | |
1658 | IN UINT16 FreqParm[],\r | |
1659 | OUT UINT8 LenParm[ ],\r | |
1660 | OUT UINT16 CodeParm[]\r | |
1661 | )\r | |
1662 | /*++\r | |
1663 | \r | |
1664 | Routine Description:\r | |
1665 | \r | |
1666 | Generates Huffman codes given a frequency distribution of symbols\r | |
1667 | \r | |
1668 | Arguments:\r | |
1669 | \r | |
1670 | NParm - number of symbols\r | |
1671 | FreqParm - frequency of each symbol\r | |
1672 | LenParm - code length for each symbol\r | |
1673 | CodeParm - code for each symbol\r | |
1674 | \r | |
1675 | Returns:\r | |
1676 | \r | |
1677 | Root of the Huffman tree.\r | |
1678 | \r | |
1679 | --*/\r | |
1680 | {\r | |
1681 | INT32 Index;\r | |
1682 | INT32 Index2;\r | |
1683 | INT32 Index3;\r | |
1684 | INT32 Avail;\r | |
1685 | \r | |
1686 | //\r | |
1687 | // make tree, calculate len[], return root\r | |
1688 | //\r | |
1689 | mN = NParm;\r | |
1690 | mFreq = FreqParm;\r | |
1691 | mLen = LenParm;\r | |
1692 | Avail = mN;\r | |
1693 | mHeapSize = 0;\r | |
1694 | mHeap[1] = 0;\r | |
1695 | for (Index = 0; Index < mN; Index++) {\r | |
1696 | mLen[Index] = 0;\r | |
1697 | if (mFreq[Index]) {\r | |
1698 | mHeapSize++;\r | |
1699 | mHeap[mHeapSize] = (INT16) Index;\r | |
1700 | }\r | |
1701 | }\r | |
1702 | \r | |
1703 | if (mHeapSize < 2) {\r | |
1704 | CodeParm[mHeap[1]] = 0;\r | |
1705 | return mHeap[1];\r | |
1706 | }\r | |
1707 | \r | |
1708 | for (Index = mHeapSize / 2; Index >= 1; Index--) {\r | |
1709 | //\r | |
1710 | // make priority queue\r | |
1711 | //\r | |
1712 | DownHeap (Index);\r | |
1713 | }\r | |
1714 | \r | |
1715 | mSortPtr = CodeParm;\r | |
1716 | do {\r | |
1717 | Index = mHeap[1];\r | |
1718 | if (Index < mN) {\r | |
1719 | *mSortPtr++ = (UINT16) Index;\r | |
1720 | }\r | |
1721 | \r | |
1722 | mHeap[1] = mHeap[mHeapSize--];\r | |
1723 | DownHeap (1);\r | |
1724 | Index2 = mHeap[1];\r | |
1725 | if (Index2 < mN) {\r | |
1726 | *mSortPtr++ = (UINT16) Index2;\r | |
1727 | }\r | |
1728 | \r | |
1729 | Index3 = Avail++;\r | |
1730 | mFreq[Index3] = (UINT16) (mFreq[Index] + mFreq[Index2]);\r | |
1731 | mHeap[1] = (INT16) Index3;\r | |
1732 | DownHeap (1);\r | |
1733 | mLeft[Index3] = (UINT16) Index;\r | |
1734 | mRight[Index3] = (UINT16) Index2;\r | |
1735 | } while (mHeapSize > 1);\r | |
1736 | \r | |
1737 | mSortPtr = CodeParm;\r | |
1738 | MakeLen (Index3);\r | |
1739 | MakeCode (NParm, LenParm, CodeParm);\r | |
1740 | \r | |
1741 | //\r | |
1742 | // return root\r | |
1743 | //\r | |
1744 | return Index3;\r | |
1745 | }\r |