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