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878ddf1f | 1 | /** @file\r |
2 | UEFI Decompress Library.\r | |
3 | \r | |
4 | Copyright (c) 2006, Intel Corporation\r | |
5 | All rights reserved. This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | Module Name: UefiDecompressLib.c\r | |
14 | \r | |
15 | **/\r | |
16 | \r | |
17 | //\r | |
18 | // Decompression algorithm begins here\r | |
19 | //\r | |
20 | #define BITBUFSIZ 32\r | |
21 | #define MAXMATCH 256\r | |
22 | #define THRESHOLD 3\r | |
23 | #define CODE_BIT 16\r | |
24 | #define BAD_TABLE - 1\r | |
25 | \r | |
26 | //\r | |
27 | // C: Char&Len Set; P: Position Set; T: exTra Set\r | |
28 | //\r | |
29 | #define NC (0xff + MAXMATCH + 2 - THRESHOLD)\r | |
30 | #define CBIT 9\r | |
31 | #define MAXPBIT 5\r | |
32 | #define TBIT 5\r | |
33 | #define MAXNP ((1U << MAXPBIT) - 1)\r | |
34 | #define NT (CODE_BIT + 3)\r | |
35 | #if NT > MAXNP\r | |
36 | #define NPT NT\r | |
37 | #else\r | |
38 | #define NPT MAXNP\r | |
39 | #endif\r | |
40 | \r | |
41 | typedef struct {\r | |
42 | UINT8 *mSrcBase; ///< Starting address of compressed data\r | |
43 | UINT8 *mDstBase; ///< Starting address of decompressed data\r | |
44 | UINT32 mOutBuf;\r | |
45 | UINT32 mInBuf;\r | |
46 | \r | |
47 | UINT16 mBitCount;\r | |
48 | UINT32 mBitBuf;\r | |
49 | UINT32 mSubBitBuf;\r | |
50 | UINT16 mBlockSize;\r | |
51 | UINT32 mCompSize;\r | |
52 | UINT32 mOrigSize;\r | |
53 | \r | |
54 | UINT16 mBadTableFlag;\r | |
55 | \r | |
56 | UINT16 mLeft[2 * NC - 1];\r | |
57 | UINT16 mRight[2 * NC - 1];\r | |
58 | UINT8 mCLen[NC];\r | |
59 | UINT8 mPTLen[NPT];\r | |
60 | UINT16 mCTable[4096];\r | |
61 | UINT16 mPTTable[256];\r | |
62 | \r | |
63 | ///\r | |
64 | /// The length of the field 'Position Set Code Length Array Size' in Block Header.\r | |
65 | /// For EFI 1.1 de/compression algorithm, mPBit = 4\r | |
66 | /// For Tiano de/compression algorithm, mPBit = 5\r | |
67 | ///\r | |
68 | UINT8 mPBit;\r | |
69 | } SCRATCH_DATA;\r | |
70 | \r | |
71 | /**\r | |
72 | Shift mBitBuf NumOfBits left. Read in NumOfBits of bits from source.\r | |
73 | \r | |
74 | @param Sd The global scratch data\r | |
75 | @param NumOfBits The number of bits to shift and read.\r | |
76 | \r | |
77 | **/\r | |
78 | VOID\r | |
79 | FillBuf (\r | |
80 | IN SCRATCH_DATA *Sd,\r | |
81 | IN UINT16 NumOfBits\r | |
82 | )\r | |
83 | {\r | |
84 | Sd->mBitBuf = (UINT32) (Sd->mBitBuf << NumOfBits);\r | |
85 | \r | |
86 | while (NumOfBits > Sd->mBitCount) {\r | |
87 | \r | |
88 | Sd->mBitBuf |= (UINT32) (Sd->mSubBitBuf << (NumOfBits = (UINT16) (NumOfBits - Sd->mBitCount)));\r | |
89 | \r | |
90 | if (Sd->mCompSize > 0) {\r | |
91 | //\r | |
92 | // Get 1 byte into SubBitBuf\r | |
93 | //\r | |
94 | Sd->mCompSize--;\r | |
95 | Sd->mSubBitBuf = 0;\r | |
96 | Sd->mSubBitBuf = Sd->mSrcBase[Sd->mInBuf++];\r | |
97 | Sd->mBitCount = 8;\r | |
98 | \r | |
99 | } else {\r | |
100 | //\r | |
101 | // No more bits from the source, just pad zero bit.\r | |
102 | //\r | |
103 | Sd->mSubBitBuf = 0;\r | |
104 | Sd->mBitCount = 8;\r | |
105 | \r | |
106 | }\r | |
107 | }\r | |
108 | \r | |
109 | Sd->mBitCount = (UINT16) (Sd->mBitCount - NumOfBits);\r | |
110 | Sd->mBitBuf |= Sd->mSubBitBuf >> Sd->mBitCount;\r | |
111 | }\r | |
112 | \r | |
113 | /**\r | |
114 | Get NumOfBits of bits out from mBitBuf. Fill mBitBuf with subsequent \r | |
115 | NumOfBits of bits from source. Returns NumOfBits of bits that are \r | |
116 | popped out.\r | |
117 | \r | |
118 | @param Sd The global scratch data.\r | |
119 | @param NumOfBits The number of bits to pop and read.\r | |
120 | \r | |
121 | @return The bits that are popped out.\r | |
122 | \r | |
123 | **/\r | |
124 | UINT32\r | |
125 | GetBits (\r | |
126 | IN SCRATCH_DATA *Sd,\r | |
127 | IN UINT16 NumOfBits\r | |
128 | )\r | |
129 | {\r | |
130 | UINT32 OutBits;\r | |
131 | \r | |
132 | OutBits = (UINT32) (Sd->mBitBuf >> (BITBUFSIZ - NumOfBits));\r | |
133 | \r | |
134 | FillBuf (Sd, NumOfBits);\r | |
135 | \r | |
136 | return OutBits;\r | |
137 | }\r | |
138 | \r | |
139 | /**\r | |
140 | Creates Huffman Code mapping table according to code length array.\r | |
141 | \r | |
142 | @param Sd The global scratch data\r | |
143 | @param NumOfChar Number of symbols in the symbol set\r | |
144 | @param BitLen Code length array\r | |
145 | @param TableBits The width of the mapping table\r | |
146 | @param Table The table\r | |
147 | \r | |
148 | @retval 0 OK.\r | |
149 | @retval BAD_TABLE The table is corrupted.\r | |
150 | \r | |
151 | **/\r | |
152 | UINT16\r | |
153 | MakeTable (\r | |
154 | IN SCRATCH_DATA *Sd,\r | |
155 | IN UINT16 NumOfChar,\r | |
156 | IN UINT8 *BitLen,\r | |
157 | IN UINT16 TableBits,\r | |
158 | OUT UINT16 *Table\r | |
159 | )\r | |
160 | {\r | |
161 | UINT16 Count[17];\r | |
162 | UINT16 Weight[17];\r | |
163 | UINT16 Start[18];\r | |
164 | UINT16 *Pointer;\r | |
165 | UINT16 Index3;\r | |
166 | volatile UINT16 Index;\r | |
167 | UINT16 Len;\r | |
168 | UINT16 Char;\r | |
169 | UINT16 JuBits;\r | |
170 | UINT16 Avail;\r | |
171 | UINT16 NextCode;\r | |
172 | UINT16 Mask;\r | |
173 | \r | |
174 | for (Index = 1; Index <= 16; Index++) {\r | |
175 | Count[Index] = 0;\r | |
176 | }\r | |
177 | \r | |
178 | for (Index = 0; Index < NumOfChar; Index++) {\r | |
179 | Count[BitLen[Index]]++;\r | |
180 | }\r | |
181 | \r | |
182 | Start[1] = 0;\r | |
183 | \r | |
184 | for (Index = 1; Index <= 16; Index++) {\r | |
185 | Start[Index + 1] = (UINT16) (Start[Index] + (Count[Index] << (16 - Index)));\r | |
186 | }\r | |
187 | \r | |
188 | if (Start[17] != 0) {\r | |
189 | /*(1U << 16)*/\r | |
190 | return (UINT16) BAD_TABLE;\r | |
191 | }\r | |
192 | \r | |
193 | JuBits = (UINT16) (16 - TableBits);\r | |
194 | \r | |
195 | for (Index = 1; Index <= TableBits; Index++) {\r | |
196 | Start[Index] >>= JuBits;\r | |
197 | Weight[Index] = (UINT16) (1U << (TableBits - Index));\r | |
198 | }\r | |
199 | \r | |
200 | while (Index <= 16) {\r | |
201 | Weight[Index] = (UINT16) (1U << (16 - Index));\r | |
202 | Index++; \r | |
203 | }\r | |
204 | \r | |
205 | Index = (UINT16) (Start[TableBits + 1] >> JuBits);\r | |
206 | \r | |
207 | if (Index != 0) {\r | |
208 | Index3 = (UINT16) (1U << TableBits);\r | |
209 | while (Index != Index3) {\r | |
210 | Table[Index++] = 0;\r | |
211 | }\r | |
212 | }\r | |
213 | \r | |
214 | Avail = NumOfChar;\r | |
215 | Mask = (UINT16) (1U << (15 - TableBits));\r | |
216 | \r | |
217 | for (Char = 0; Char < NumOfChar; Char++) {\r | |
218 | \r | |
219 | Len = BitLen[Char];\r | |
220 | if (Len == 0) {\r | |
221 | continue;\r | |
222 | }\r | |
223 | \r | |
224 | NextCode = (UINT16) (Start[Len] + Weight[Len]);\r | |
225 | \r | |
226 | if (Len <= TableBits) {\r | |
227 | \r | |
228 | for (Index = Start[Len]; Index < NextCode; Index++) {\r | |
229 | Table[Index] = Char;\r | |
230 | }\r | |
231 | \r | |
232 | } else {\r | |
233 | \r | |
234 | Index3 = Start[Len];\r | |
235 | Pointer = &Table[Index3 >> JuBits];\r | |
236 | Index = (UINT16) (Len - TableBits);\r | |
237 | \r | |
238 | while (Index != 0) {\r | |
239 | if (*Pointer == 0) {\r | |
240 | Sd->mRight[Avail] = Sd->mLeft[Avail] = 0;\r | |
241 | *Pointer = Avail++;\r | |
242 | }\r | |
243 | \r | |
244 | if (Index3 & Mask) {\r | |
245 | Pointer = &Sd->mRight[*Pointer];\r | |
246 | } else {\r | |
247 | Pointer = &Sd->mLeft[*Pointer];\r | |
248 | }\r | |
249 | \r | |
250 | Index3 <<= 1;\r | |
251 | Index--;\r | |
252 | }\r | |
253 | \r | |
254 | *Pointer = Char;\r | |
255 | \r | |
256 | }\r | |
257 | \r | |
258 | Start[Len] = NextCode;\r | |
259 | }\r | |
260 | //\r | |
261 | // Succeeds\r | |
262 | //\r | |
263 | return 0;\r | |
264 | }\r | |
265 | \r | |
266 | /**\r | |
267 | Decodes a position value.\r | |
268 | \r | |
269 | @param Sd the global scratch data\r | |
270 | \r | |
271 | @return The position value decoded.\r | |
272 | \r | |
273 | **/\r | |
274 | UINT32\r | |
275 | DecodeP (\r | |
276 | IN SCRATCH_DATA *Sd\r | |
277 | )\r | |
278 | {\r | |
279 | UINT16 Val;\r | |
280 | UINT32 Mask;\r | |
281 | UINT32 Pos;\r | |
282 | \r | |
283 | Val = Sd->mPTTable[Sd->mBitBuf >> (BITBUFSIZ - 8)];\r | |
284 | \r | |
285 | if (Val >= MAXNP) {\r | |
286 | Mask = 1U << (BITBUFSIZ - 1 - 8);\r | |
287 | \r | |
288 | do {\r | |
289 | \r | |
290 | if (Sd->mBitBuf & Mask) {\r | |
291 | Val = Sd->mRight[Val];\r | |
292 | } else {\r | |
293 | Val = Sd->mLeft[Val];\r | |
294 | }\r | |
295 | \r | |
296 | Mask >>= 1;\r | |
297 | } while (Val >= MAXNP);\r | |
298 | }\r | |
299 | //\r | |
300 | // Advance what we have read\r | |
301 | //\r | |
302 | FillBuf (Sd, Sd->mPTLen[Val]);\r | |
303 | \r | |
304 | Pos = Val;\r | |
305 | if (Val > 1) {\r | |
306 | Pos = (UINT32) ((1U << (Val - 1)) + GetBits (Sd, (UINT16) (Val - 1)));\r | |
307 | }\r | |
308 | \r | |
309 | return Pos;\r | |
310 | }\r | |
311 | \r | |
312 | /**\r | |
313 | Reads code lengths for the Extra Set or the Position Set.\r | |
314 | \r | |
315 | @param Sd The global scratch data.\r | |
316 | @param nn Number of symbols.\r | |
317 | @param nbit Number of bits needed to represent nn.\r | |
318 | @param Special The special symbol that needs to be taken care of.\r | |
319 | \r | |
320 | @retval 0 OK.\r | |
321 | @retval BAD_TABLE Table is corrupted.\r | |
322 | \r | |
323 | **/\r | |
324 | UINT16\r | |
325 | ReadPTLen (\r | |
326 | IN SCRATCH_DATA *Sd,\r | |
327 | IN UINT16 nn,\r | |
328 | IN UINT16 nbit,\r | |
329 | IN UINT16 Special\r | |
330 | )\r | |
331 | {\r | |
332 | UINT16 Number;\r | |
333 | UINT16 CharC;\r | |
334 | volatile UINT16 Index;\r | |
335 | UINT32 Mask;\r | |
336 | \r | |
337 | Number = (UINT16) GetBits (Sd, nbit);\r | |
338 | \r | |
339 | if (Number == 0) {\r | |
340 | CharC = (UINT16) GetBits (Sd, nbit);\r | |
341 | \r | |
342 | for (Index = 0; Index < 256; Index++) {\r | |
343 | Sd->mPTTable[Index] = CharC;\r | |
344 | }\r | |
345 | \r | |
346 | for (Index = 0; Index < nn; Index++) {\r | |
347 | Sd->mPTLen[Index] = 0;\r | |
348 | }\r | |
349 | \r | |
350 | return 0;\r | |
351 | }\r | |
352 | \r | |
353 | Index = 0;\r | |
354 | \r | |
355 | while (Index < Number) {\r | |
356 | \r | |
357 | CharC = (UINT16) (Sd->mBitBuf >> (BITBUFSIZ - 3));\r | |
358 | \r | |
359 | if (CharC == 7) {\r | |
360 | Mask = 1U << (BITBUFSIZ - 1 - 3);\r | |
361 | while (Mask & Sd->mBitBuf) {\r | |
362 | Mask >>= 1;\r | |
363 | CharC += 1;\r | |
364 | }\r | |
365 | }\r | |
366 | \r | |
367 | FillBuf (Sd, (UINT16) ((CharC < 7) ? 3 : CharC - 3));\r | |
368 | \r | |
369 | Sd->mPTLen[Index++] = (UINT8) CharC;\r | |
370 | \r | |
371 | if (Index == Special) {\r | |
372 | CharC = (UINT16) GetBits (Sd, 2);\r | |
373 | while ((INT16) (--CharC) >= 0) {\r | |
374 | Sd->mPTLen[Index++] = 0;\r | |
375 | }\r | |
376 | }\r | |
377 | }\r | |
378 | \r | |
379 | while (Index < nn) {\r | |
380 | Sd->mPTLen[Index++] = 0;\r | |
381 | }\r | |
382 | \r | |
383 | return MakeTable (Sd, nn, Sd->mPTLen, 8, Sd->mPTTable);\r | |
384 | }\r | |
385 | \r | |
386 | /**\r | |
387 | Reads code lengths for Char&Len Set.\r | |
388 | \r | |
389 | @param Sd the global scratch data\r | |
390 | \r | |
391 | **/\r | |
392 | VOID\r | |
393 | ReadCLen (\r | |
394 | SCRATCH_DATA *Sd\r | |
395 | )\r | |
396 | {\r | |
397 | UINT16 Number;\r | |
398 | UINT16 CharC;\r | |
399 | volatile UINT16 Index;\r | |
400 | UINT32 Mask;\r | |
401 | \r | |
402 | Number = (UINT16) GetBits (Sd, CBIT);\r | |
403 | \r | |
404 | if (Number == 0) {\r | |
405 | CharC = (UINT16) GetBits (Sd, CBIT);\r | |
406 | \r | |
407 | for (Index = 0; Index < NC; Index++) {\r | |
408 | Sd->mCLen[Index] = 0;\r | |
409 | }\r | |
410 | \r | |
411 | for (Index = 0; Index < 4096; Index++) {\r | |
412 | Sd->mCTable[Index] = CharC;\r | |
413 | }\r | |
414 | \r | |
415 | return ;\r | |
416 | }\r | |
417 | \r | |
418 | Index = 0;\r | |
419 | while (Index < Number) {\r | |
420 | \r | |
421 | CharC = Sd->mPTTable[Sd->mBitBuf >> (BITBUFSIZ - 8)];\r | |
422 | if (CharC >= NT) {\r | |
423 | Mask = 1U << (BITBUFSIZ - 1 - 8);\r | |
424 | \r | |
425 | do {\r | |
426 | \r | |
427 | if (Mask & Sd->mBitBuf) {\r | |
428 | CharC = Sd->mRight[CharC];\r | |
429 | } else {\r | |
430 | CharC = Sd->mLeft[CharC];\r | |
431 | }\r | |
432 | \r | |
433 | Mask >>= 1;\r | |
434 | \r | |
435 | } while (CharC >= NT);\r | |
436 | }\r | |
437 | //\r | |
438 | // Advance what we have read\r | |
439 | //\r | |
440 | FillBuf (Sd, Sd->mPTLen[CharC]);\r | |
441 | \r | |
442 | if (CharC <= 2) {\r | |
443 | \r | |
444 | if (CharC == 0) {\r | |
445 | CharC = 1;\r | |
446 | } else if (CharC == 1) {\r | |
447 | CharC = (UINT16) (GetBits (Sd, 4) + 3);\r | |
448 | } else if (CharC == 2) {\r | |
449 | CharC = (UINT16) (GetBits (Sd, CBIT) + 20);\r | |
450 | }\r | |
451 | \r | |
452 | while ((INT16) (--CharC) >= 0) {\r | |
453 | Sd->mCLen[Index++] = 0;\r | |
454 | }\r | |
455 | \r | |
456 | } else {\r | |
457 | \r | |
458 | Sd->mCLen[Index++] = (UINT8) (CharC - 2);\r | |
459 | \r | |
460 | }\r | |
461 | }\r | |
462 | \r | |
463 | while (Index < NC) {\r | |
464 | Sd->mCLen[Index++] = 0;\r | |
465 | }\r | |
466 | \r | |
467 | MakeTable (Sd, NC, Sd->mCLen, 12, Sd->mCTable);\r | |
468 | \r | |
469 | return ;\r | |
470 | }\r | |
471 | \r | |
472 | /**\r | |
473 | Decode a character/length value.\r | |
474 | \r | |
475 | @param Sd The global scratch data.\r | |
476 | \r | |
477 | @return The value decoded.\r | |
478 | \r | |
479 | **/\r | |
480 | UINT16\r | |
481 | DecodeC (\r | |
482 | SCRATCH_DATA *Sd\r | |
483 | )\r | |
484 | {\r | |
485 | UINT16 Index2;\r | |
486 | UINT32 Mask;\r | |
487 | \r | |
488 | if (Sd->mBlockSize == 0) {\r | |
489 | //\r | |
490 | // Starting a new block\r | |
491 | //\r | |
492 | Sd->mBlockSize = (UINT16) GetBits (Sd, 16);\r | |
493 | Sd->mBadTableFlag = ReadPTLen (Sd, NT, TBIT, 3);\r | |
494 | if (Sd->mBadTableFlag != 0) {\r | |
495 | return 0;\r | |
496 | }\r | |
497 | \r | |
498 | ReadCLen (Sd);\r | |
499 | \r | |
500 | Sd->mBadTableFlag = ReadPTLen (Sd, MAXNP, Sd->mPBit, (UINT16) (-1));\r | |
501 | if (Sd->mBadTableFlag != 0) {\r | |
502 | return 0;\r | |
503 | }\r | |
504 | }\r | |
505 | \r | |
506 | Sd->mBlockSize--;\r | |
507 | Index2 = Sd->mCTable[Sd->mBitBuf >> (BITBUFSIZ - 12)];\r | |
508 | \r | |
509 | if (Index2 >= NC) {\r | |
510 | Mask = 1U << (BITBUFSIZ - 1 - 12);\r | |
511 | \r | |
512 | do {\r | |
513 | if (Sd->mBitBuf & Mask) {\r | |
514 | Index2 = Sd->mRight[Index2];\r | |
515 | } else {\r | |
516 | Index2 = Sd->mLeft[Index2];\r | |
517 | }\r | |
518 | \r | |
519 | Mask >>= 1;\r | |
520 | } while (Index2 >= NC);\r | |
521 | }\r | |
522 | //\r | |
523 | // Advance what we have read\r | |
524 | //\r | |
525 | FillBuf (Sd, Sd->mCLen[Index2]);\r | |
526 | \r | |
527 | return Index2;\r | |
528 | }\r | |
529 | \r | |
530 | /**\r | |
531 | Decode the source data and put the resulting data into the destination buffer.\r | |
532 | \r | |
533 | @param Sd The global scratch data\r | |
534 | \r | |
535 | **/\r | |
536 | VOID\r | |
537 | Decode (\r | |
538 | SCRATCH_DATA *Sd\r | |
539 | )\r | |
540 | {\r | |
541 | UINT16 BytesRemain;\r | |
542 | UINT32 DataIdx;\r | |
543 | UINT16 CharC;\r | |
544 | \r | |
545 | BytesRemain = (UINT16) (-1);\r | |
546 | \r | |
547 | DataIdx = 0;\r | |
548 | \r | |
549 | for (;;) {\r | |
550 | CharC = DecodeC (Sd);\r | |
551 | if (Sd->mBadTableFlag != 0) {\r | |
552 | return ;\r | |
553 | }\r | |
554 | \r | |
555 | if (CharC < 256) {\r | |
556 | //\r | |
557 | // Process an Original character\r | |
558 | //\r | |
559 | if (Sd->mOutBuf >= Sd->mOrigSize) {\r | |
560 | return ;\r | |
561 | } else {\r | |
562 | Sd->mDstBase[Sd->mOutBuf++] = (UINT8) CharC;\r | |
563 | }\r | |
564 | \r | |
565 | } else {\r | |
566 | //\r | |
567 | // Process a Pointer\r | |
568 | //\r | |
569 | CharC = (UINT16) (CharC - (UINT8_MAX + 1 - THRESHOLD));\r | |
570 | \r | |
571 | BytesRemain = CharC;\r | |
572 | \r | |
573 | DataIdx = Sd->mOutBuf - DecodeP (Sd) - 1;\r | |
574 | \r | |
575 | BytesRemain--;\r | |
576 | while ((INT16) (BytesRemain) >= 0) {\r | |
577 | Sd->mDstBase[Sd->mOutBuf++] = Sd->mDstBase[DataIdx++];\r | |
578 | if (Sd->mOutBuf >= Sd->mOrigSize) {\r | |
579 | return ;\r | |
580 | }\r | |
581 | \r | |
582 | BytesRemain--;\r | |
583 | }\r | |
584 | }\r | |
585 | }\r | |
586 | \r | |
587 | return ;\r | |
588 | }\r | |
589 | \r | |
590 | /**\r | |
591 | The internal implementation of *_DECOMPRESS_PROTOCOL.GetInfo().\r | |
592 | \r | |
593 | @param Source The source buffer containing the compressed data.\r | |
594 | @param SourceSize The size of source buffer\r | |
595 | @param DestinationSize The size of destination buffer.\r | |
596 | @param ScratchSize The size of scratch buffer.\r | |
597 | \r | |
598 | @retval RETURN_SUCCESS The size of destination buffer and the size of scratch buffer are successull retrieved.\r | |
599 | @retval RETURN_INVALID_PARAMETER The source data is corrupted\r | |
600 | \r | |
601 | **/\r | |
602 | RETURN_STATUS\r | |
603 | EFIAPI\r | |
604 | UefiDecompressGetInfo (\r | |
605 | IN CONST VOID *Source,\r | |
606 | IN UINT32 SourceSize,\r | |
607 | OUT UINT32 *DestinationSize,\r | |
608 | OUT UINT32 *ScratchSize\r | |
609 | )\r | |
610 | {\r | |
611 | UINT32 CompressedSize;\r | |
612 | \r | |
613 | ASSERT (Source != NULL);\r | |
614 | ASSERT (DestinationSize != NULL);\r | |
615 | ASSERT (ScratchSize != NULL);\r | |
616 | \r | |
617 | *ScratchSize = sizeof (SCRATCH_DATA);\r | |
618 | \r | |
619 | if (SourceSize < 8) {\r | |
620 | return RETURN_INVALID_PARAMETER;\r | |
621 | }\r | |
622 | \r | |
623 | CopyMem (&CompressedSize, Source, sizeof (UINT32));\r | |
624 | CopyMem (DestinationSize, (VOID *)((UINT8 *)Source + 4), sizeof (UINT32));\r | |
625 | \r | |
626 | if (SourceSize < (CompressedSize + 8)) {\r | |
627 | return RETURN_INVALID_PARAMETER;\r | |
628 | }\r | |
629 | \r | |
630 | return RETURN_SUCCESS;\r | |
631 | }\r | |
632 | \r | |
633 | /**\r | |
634 | The internal implementation of *_DECOMPRESS_PROTOCOL.Decompress().\r | |
635 | \r | |
636 | @param Source The source buffer containing the compressed data.\r | |
637 | @param Destination The destination buffer to store the decompressed data\r | |
638 | @param Scratch The buffer used internally by the decompress routine. This buffer is needed to store intermediate data.\r | |
639 | \r | |
640 | @retval RETURN_SUCCESS Decompression is successfull\r | |
641 | @retval RETURN_INVALID_PARAMETER The source data is corrupted\r | |
642 | \r | |
643 | **/\r | |
644 | RETURN_STATUS\r | |
645 | EFIAPI\r | |
646 | UefiDecompress (\r | |
647 | IN CONST VOID *Source,\r | |
648 | IN OUT VOID *Destination,\r | |
649 | IN OUT VOID *Scratch\r | |
650 | )\r | |
651 | {\r | |
652 | volatile UINT32 Index;\r | |
653 | UINT32 CompSize;\r | |
654 | UINT32 OrigSize;\r | |
655 | SCRATCH_DATA *Sd;\r | |
656 | CONST UINT8 *Src;\r | |
657 | UINT8 *Dst;\r | |
658 | \r | |
659 | ASSERT (Source != NULL);\r | |
660 | ASSERT (Destination != NULL);\r | |
661 | ASSERT (Scratch != NULL);\r | |
662 | \r | |
663 | Src = Source;\r | |
664 | Dst = Destination;\r | |
665 | \r | |
666 | Sd = (SCRATCH_DATA *) Scratch;\r | |
667 | \r | |
668 | CompSize = Src[0] + (Src[1] << 8) + (Src[2] << 16) + (Src[3] << 24);\r | |
669 | OrigSize = Src[4] + (Src[5] << 8) + (Src[6] << 16) + (Src[7] << 24);\r | |
670 | \r | |
671 | //\r | |
672 | // If compressed file size is 0, return\r | |
673 | //\r | |
674 | if (OrigSize == 0) {\r | |
675 | return RETURN_SUCCESS;\r | |
676 | }\r | |
677 | \r | |
678 | Src = Src + 8;\r | |
679 | \r | |
680 | for (Index = 0; Index < sizeof (SCRATCH_DATA); Index++) {\r | |
681 | ((UINT8 *) Sd)[Index] = 0;\r | |
682 | }\r | |
683 | //\r | |
684 | // The length of the field 'Position Set Code Length Array Size' in Block Header.\r | |
685 | // For EFI 1.1 de/compression algorithm(Version 1), mPBit = 4\r | |
686 | // For Tiano de/compression algorithm(Version 2), mPBit = 5\r | |
687 | //\r | |
688 | Sd->mPBit = 4;\r | |
689 | Sd->mSrcBase = (UINT8 *)Src;\r | |
690 | Sd->mDstBase = Dst;\r | |
691 | Sd->mCompSize = CompSize;\r | |
692 | Sd->mOrigSize = OrigSize;\r | |
693 | \r | |
694 | //\r | |
695 | // Fill the first BITBUFSIZ bits\r | |
696 | //\r | |
697 | FillBuf (Sd, BITBUFSIZ);\r | |
698 | \r | |
699 | //\r | |
700 | // Decompress it\r | |
701 | //\r | |
702 | Decode (Sd);\r | |
703 | \r | |
704 | if (Sd->mBadTableFlag != 0) {\r | |
705 | //\r | |
706 | // Something wrong with the source\r | |
707 | //\r | |
708 | return RETURN_INVALID_PARAMETER;\r | |
709 | }\r | |
710 | \r | |
711 | return RETURN_SUCCESS;\r | |
712 | }\r |