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1 | /* Lzma decompressor for Linux kernel. Shamelessly snarfed |
2 | *from busybox 1.1.1 |
3 | * |
4 | *Linux kernel adaptation |
5 | *Copyright (C) 2006 Alain < alain@knaff.lu > |
6 | * |
7 | *Based on small lzma deflate implementation/Small range coder |
8 | *implementation for lzma. |
9 | *Copyright (C) 2006 Aurelien Jacobs < aurel@gnuage.org > |
10 | * |
11 | *Based on LzmaDecode.c from the LZMA SDK 4.22 (http://www.7-zip.org/) |
12 | *Copyright (C) 1999-2005 Igor Pavlov |
13 | * |
14 | *Copyrights of the parts, see headers below. |
15 | * |
16 | * |
17 | *This program is free software; you can redistribute it and/or |
18 | *modify it under the terms of the GNU Lesser General Public |
19 | *License as published by the Free Software Foundation; either |
20 | *version 2.1 of the License, or (at your option) any later version. |
21 | * |
22 | *This program is distributed in the hope that it will be useful, |
23 | *but WITHOUT ANY WARRANTY; without even the implied warranty of |
24 | *MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
25 | *Lesser General Public License for more details. |
26 | * |
27 | *You should have received a copy of the GNU Lesser General Public |
28 | *License along with this library; if not, write to the Free Software |
29 | *Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
30 | */ |
31 | |
32 | #ifdef STATIC |
33 | #define PREBOOT |
34 | #else |
35 | #include <linux/decompress/unlzma.h> |
36 | #include <linux/slab.h> |
37 | #endif /* STATIC */ |
38 | |
39 | #include <linux/decompress/mm.h> |
40 | |
41 | #define MIN(a, b) (((a) < (b)) ? (a) : (b)) |
42 | |
43 | static long long INIT read_int(unsigned char *ptr, int size) |
44 | { |
45 | int i; |
46 | long long ret = 0; |
47 | |
48 | for (i = 0; i < size; i++) |
49 | ret = (ret << 8) | ptr[size-i-1]; |
50 | return ret; |
51 | } |
52 | |
53 | #define ENDIAN_CONVERT(x) \ |
54 | x = (typeof(x))read_int((unsigned char *)&x, sizeof(x)) |
55 | |
56 | |
57 | /* Small range coder implementation for lzma. |
58 | *Copyright (C) 2006 Aurelien Jacobs < aurel@gnuage.org > |
59 | * |
60 | *Based on LzmaDecode.c from the LZMA SDK 4.22 (http://www.7-zip.org/) |
61 | *Copyright (c) 1999-2005 Igor Pavlov |
62 | */ |
63 | |
64 | #include <linux/compiler.h> |
65 | |
66 | #define LZMA_IOBUF_SIZE 0x10000 |
67 | |
68 | struct rc { |
69 | int (*fill)(void*, unsigned int); |
70 | uint8_t *ptr; |
71 | uint8_t *buffer; |
72 | uint8_t *buffer_end; |
73 | int buffer_size; |
74 | uint32_t code; |
75 | uint32_t range; |
76 | uint32_t bound; |
77 | }; |
78 | |
79 | |
80 | #define RC_TOP_BITS 24 |
81 | #define RC_MOVE_BITS 5 |
82 | #define RC_MODEL_TOTAL_BITS 11 |
83 | |
84 | |
85 | static int nofill(void *buffer, unsigned int len) |
86 | { |
87 | return -1; |
88 | } |
89 | |
90 | /* Called twice: once at startup and once in rc_normalize() */ |
91 | static void INIT rc_read(struct rc *rc) |
92 | { |
93 | rc->buffer_size = rc->fill((char *)rc->buffer, LZMA_IOBUF_SIZE); |
94 | if (rc->buffer_size <= 0) |
95 | error("unexpected EOF"); |
96 | rc->ptr = rc->buffer; |
97 | rc->buffer_end = rc->buffer + rc->buffer_size; |
98 | } |
99 | |
100 | /* Called once */ |
101 | static inline void INIT rc_init(struct rc *rc, |
102 | int (*fill)(void*, unsigned int), |
103 | char *buffer, int buffer_size) |
104 | { |
105 | if (fill) |
106 | rc->fill = fill; |
107 | else |
108 | rc->fill = nofill; |
109 | rc->buffer = (uint8_t *)buffer; |
110 | rc->buffer_size = buffer_size; |
111 | rc->buffer_end = rc->buffer + rc->buffer_size; |
112 | rc->ptr = rc->buffer; |
113 | |
114 | rc->code = 0; |
115 | rc->range = 0xFFFFFFFF; |
116 | } |
117 | |
118 | static inline void INIT rc_init_code(struct rc *rc) |
119 | { |
120 | int i; |
121 | |
122 | for (i = 0; i < 5; i++) { |
123 | if (rc->ptr >= rc->buffer_end) |
124 | rc_read(rc); |
125 | rc->code = (rc->code << 8) | *rc->ptr++; |
126 | } |
127 | } |
128 | |
129 | |
130 | /* Called once. TODO: bb_maybe_free() */ |
131 | static inline void INIT rc_free(struct rc *rc) |
132 | { |
133 | free(rc->buffer); |
134 | } |
135 | |
136 | /* Called twice, but one callsite is in inline'd rc_is_bit_0_helper() */ |
137 | static void INIT rc_do_normalize(struct rc *rc) |
138 | { |
139 | if (rc->ptr >= rc->buffer_end) |
140 | rc_read(rc); |
141 | rc->range <<= 8; |
142 | rc->code = (rc->code << 8) | *rc->ptr++; |
143 | } |
144 | static inline void INIT rc_normalize(struct rc *rc) |
145 | { |
146 | if (rc->range < (1 << RC_TOP_BITS)) |
147 | rc_do_normalize(rc); |
148 | } |
149 | |
150 | /* Called 9 times */ |
151 | /* Why rc_is_bit_0_helper exists? |
152 | *Because we want to always expose (rc->code < rc->bound) to optimizer |
153 | */ |
154 | static inline uint32_t INIT rc_is_bit_0_helper(struct rc *rc, uint16_t *p) |
155 | { |
156 | rc_normalize(rc); |
157 | rc->bound = *p * (rc->range >> RC_MODEL_TOTAL_BITS); |
158 | return rc->bound; |
159 | } |
160 | static inline int INIT rc_is_bit_0(struct rc *rc, uint16_t *p) |
161 | { |
162 | uint32_t t = rc_is_bit_0_helper(rc, p); |
163 | return rc->code < t; |
164 | } |
165 | |
166 | /* Called ~10 times, but very small, thus inlined */ |
167 | static inline void INIT rc_update_bit_0(struct rc *rc, uint16_t *p) |
168 | { |
169 | rc->range = rc->bound; |
170 | *p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS; |
171 | } |
172 | static inline void rc_update_bit_1(struct rc *rc, uint16_t *p) |
173 | { |
174 | rc->range -= rc->bound; |
175 | rc->code -= rc->bound; |
176 | *p -= *p >> RC_MOVE_BITS; |
177 | } |
178 | |
179 | /* Called 4 times in unlzma loop */ |
180 | static int INIT rc_get_bit(struct rc *rc, uint16_t *p, int *symbol) |
181 | { |
182 | if (rc_is_bit_0(rc, p)) { |
183 | rc_update_bit_0(rc, p); |
184 | *symbol *= 2; |
185 | return 0; |
186 | } else { |
187 | rc_update_bit_1(rc, p); |
188 | *symbol = *symbol * 2 + 1; |
189 | return 1; |
190 | } |
191 | } |
192 | |
193 | /* Called once */ |
194 | static inline int INIT rc_direct_bit(struct rc *rc) |
195 | { |
196 | rc_normalize(rc); |
197 | rc->range >>= 1; |
198 | if (rc->code >= rc->range) { |
199 | rc->code -= rc->range; |
200 | return 1; |
201 | } |
202 | return 0; |
203 | } |
204 | |
205 | /* Called twice */ |
206 | static inline void INIT |
207 | rc_bit_tree_decode(struct rc *rc, uint16_t *p, int num_levels, int *symbol) |
208 | { |
209 | int i = num_levels; |
210 | |
211 | *symbol = 1; |
212 | while (i--) |
213 | rc_get_bit(rc, p + *symbol, symbol); |
214 | *symbol -= 1 << num_levels; |
215 | } |
216 | |
217 | |
218 | /* |
219 | * Small lzma deflate implementation. |
220 | * Copyright (C) 2006 Aurelien Jacobs < aurel@gnuage.org > |
221 | * |
222 | * Based on LzmaDecode.c from the LZMA SDK 4.22 (http://www.7-zip.org/) |
223 | * Copyright (C) 1999-2005 Igor Pavlov |
224 | */ |
225 | |
226 | |
227 | struct lzma_header { |
228 | uint8_t pos; |
229 | uint32_t dict_size; |
230 | uint64_t dst_size; |
231 | } __attribute__ ((packed)) ; |
232 | |
233 | |
234 | #define LZMA_BASE_SIZE 1846 |
235 | #define LZMA_LIT_SIZE 768 |
236 | |
237 | #define LZMA_NUM_POS_BITS_MAX 4 |
238 | |
239 | #define LZMA_LEN_NUM_LOW_BITS 3 |
240 | #define LZMA_LEN_NUM_MID_BITS 3 |
241 | #define LZMA_LEN_NUM_HIGH_BITS 8 |
242 | |
243 | #define LZMA_LEN_CHOICE 0 |
244 | #define LZMA_LEN_CHOICE_2 (LZMA_LEN_CHOICE + 1) |
245 | #define LZMA_LEN_LOW (LZMA_LEN_CHOICE_2 + 1) |
246 | #define LZMA_LEN_MID (LZMA_LEN_LOW \ |
247 | + (1 << (LZMA_NUM_POS_BITS_MAX + LZMA_LEN_NUM_LOW_BITS))) |
248 | #define LZMA_LEN_HIGH (LZMA_LEN_MID \ |
249 | +(1 << (LZMA_NUM_POS_BITS_MAX + LZMA_LEN_NUM_MID_BITS))) |
250 | #define LZMA_NUM_LEN_PROBS (LZMA_LEN_HIGH + (1 << LZMA_LEN_NUM_HIGH_BITS)) |
251 | |
252 | #define LZMA_NUM_STATES 12 |
253 | #define LZMA_NUM_LIT_STATES 7 |
254 | |
255 | #define LZMA_START_POS_MODEL_INDEX 4 |
256 | #define LZMA_END_POS_MODEL_INDEX 14 |
257 | #define LZMA_NUM_FULL_DISTANCES (1 << (LZMA_END_POS_MODEL_INDEX >> 1)) |
258 | |
259 | #define LZMA_NUM_POS_SLOT_BITS 6 |
260 | #define LZMA_NUM_LEN_TO_POS_STATES 4 |
261 | |
262 | #define LZMA_NUM_ALIGN_BITS 4 |
263 | |
264 | #define LZMA_MATCH_MIN_LEN 2 |
265 | |
266 | #define LZMA_IS_MATCH 0 |
267 | #define LZMA_IS_REP (LZMA_IS_MATCH + (LZMA_NUM_STATES << LZMA_NUM_POS_BITS_MAX)) |
268 | #define LZMA_IS_REP_G0 (LZMA_IS_REP + LZMA_NUM_STATES) |
269 | #define LZMA_IS_REP_G1 (LZMA_IS_REP_G0 + LZMA_NUM_STATES) |
270 | #define LZMA_IS_REP_G2 (LZMA_IS_REP_G1 + LZMA_NUM_STATES) |
271 | #define LZMA_IS_REP_0_LONG (LZMA_IS_REP_G2 + LZMA_NUM_STATES) |
272 | #define LZMA_POS_SLOT (LZMA_IS_REP_0_LONG \ |
273 | + (LZMA_NUM_STATES << LZMA_NUM_POS_BITS_MAX)) |
274 | #define LZMA_SPEC_POS (LZMA_POS_SLOT \ |
275 | +(LZMA_NUM_LEN_TO_POS_STATES << LZMA_NUM_POS_SLOT_BITS)) |
276 | #define LZMA_ALIGN (LZMA_SPEC_POS \ |
277 | + LZMA_NUM_FULL_DISTANCES - LZMA_END_POS_MODEL_INDEX) |
278 | #define LZMA_LEN_CODER (LZMA_ALIGN + (1 << LZMA_NUM_ALIGN_BITS)) |
279 | #define LZMA_REP_LEN_CODER (LZMA_LEN_CODER + LZMA_NUM_LEN_PROBS) |
280 | #define LZMA_LITERAL (LZMA_REP_LEN_CODER + LZMA_NUM_LEN_PROBS) |
281 | |
282 | |
283 | struct writer { |
284 | uint8_t *buffer; |
285 | uint8_t previous_byte; |
286 | size_t buffer_pos; |
287 | int bufsize; |
288 | size_t global_pos; |
289 | int(*flush)(void*, unsigned int); |
290 | struct lzma_header *header; |
291 | }; |
292 | |
293 | struct cstate { |
294 | int state; |
295 | uint32_t rep0, rep1, rep2, rep3; |
296 | }; |
297 | |
298 | static inline size_t INIT get_pos(struct writer *wr) |
299 | { |
300 | return |
301 | wr->global_pos + wr->buffer_pos; |
302 | } |
303 | |
304 | static inline uint8_t INIT peek_old_byte(struct writer *wr, |
305 | uint32_t offs) |
306 | { |
307 | if (!wr->flush) { |
308 | int32_t pos; |
309 | while (offs > wr->header->dict_size) |
310 | offs -= wr->header->dict_size; |
311 | pos = wr->buffer_pos - offs; |
312 | return wr->buffer[pos]; |
313 | } else { |
314 | uint32_t pos = wr->buffer_pos - offs; |
315 | while (pos >= wr->header->dict_size) |
316 | pos += wr->header->dict_size; |
317 | return wr->buffer[pos]; |
318 | } |
319 | |
320 | } |
321 | |
322 | static inline void INIT write_byte(struct writer *wr, uint8_t byte) |
323 | { |
324 | wr->buffer[wr->buffer_pos++] = wr->previous_byte = byte; |
325 | if (wr->flush && wr->buffer_pos == wr->header->dict_size) { |
326 | wr->buffer_pos = 0; |
327 | wr->global_pos += wr->header->dict_size; |
328 | wr->flush((char *)wr->buffer, wr->header->dict_size); |
329 | } |
330 | } |
331 | |
332 | |
333 | static inline void INIT copy_byte(struct writer *wr, uint32_t offs) |
334 | { |
335 | write_byte(wr, peek_old_byte(wr, offs)); |
336 | } |
337 | |
338 | static inline void INIT copy_bytes(struct writer *wr, |
339 | uint32_t rep0, int len) |
340 | { |
341 | do { |
342 | copy_byte(wr, rep0); |
343 | len--; |
344 | } while (len != 0 && wr->buffer_pos < wr->header->dst_size); |
345 | } |
346 | |
347 | static inline void INIT process_bit0(struct writer *wr, struct rc *rc, |
348 | struct cstate *cst, uint16_t *p, |
349 | int pos_state, uint16_t *prob, |
350 | int lc, uint32_t literal_pos_mask) { |
351 | int mi = 1; |
352 | rc_update_bit_0(rc, prob); |
353 | prob = (p + LZMA_LITERAL + |
354 | (LZMA_LIT_SIZE |
355 | * (((get_pos(wr) & literal_pos_mask) << lc) |
356 | + (wr->previous_byte >> (8 - lc)))) |
357 | ); |
358 | |
359 | if (cst->state >= LZMA_NUM_LIT_STATES) { |
360 | int match_byte = peek_old_byte(wr, cst->rep0); |
361 | do { |
362 | int bit; |
363 | uint16_t *prob_lit; |
364 | |
365 | match_byte <<= 1; |
366 | bit = match_byte & 0x100; |
367 | prob_lit = prob + 0x100 + bit + mi; |
368 | if (rc_get_bit(rc, prob_lit, &mi)) { |
369 | if (!bit) |
370 | break; |
371 | } else { |
372 | if (bit) |
373 | break; |
374 | } |
375 | } while (mi < 0x100); |
376 | } |
377 | while (mi < 0x100) { |
378 | uint16_t *prob_lit = prob + mi; |
379 | rc_get_bit(rc, prob_lit, &mi); |
380 | } |
381 | write_byte(wr, mi); |
382 | if (cst->state < 4) |
383 | cst->state = 0; |
384 | else if (cst->state < 10) |
385 | cst->state -= 3; |
386 | else |
387 | cst->state -= 6; |
388 | } |
389 | |
390 | static inline void INIT process_bit1(struct writer *wr, struct rc *rc, |
391 | struct cstate *cst, uint16_t *p, |
392 | int pos_state, uint16_t *prob) { |
393 | int offset; |
394 | uint16_t *prob_len; |
395 | int num_bits; |
396 | int len; |
397 | |
398 | rc_update_bit_1(rc, prob); |
399 | prob = p + LZMA_IS_REP + cst->state; |
400 | if (rc_is_bit_0(rc, prob)) { |
401 | rc_update_bit_0(rc, prob); |
402 | cst->rep3 = cst->rep2; |
403 | cst->rep2 = cst->rep1; |
404 | cst->rep1 = cst->rep0; |
405 | cst->state = cst->state < LZMA_NUM_LIT_STATES ? 0 : 3; |
406 | prob = p + LZMA_LEN_CODER; |
407 | } else { |
408 | rc_update_bit_1(rc, prob); |
409 | prob = p + LZMA_IS_REP_G0 + cst->state; |
410 | if (rc_is_bit_0(rc, prob)) { |
411 | rc_update_bit_0(rc, prob); |
412 | prob = (p + LZMA_IS_REP_0_LONG |
413 | + (cst->state << |
414 | LZMA_NUM_POS_BITS_MAX) + |
415 | pos_state); |
416 | if (rc_is_bit_0(rc, prob)) { |
417 | rc_update_bit_0(rc, prob); |
418 | |
419 | cst->state = cst->state < LZMA_NUM_LIT_STATES ? |
420 | 9 : 11; |
421 | copy_byte(wr, cst->rep0); |
422 | return; |
423 | } else { |
424 | rc_update_bit_1(rc, prob); |
425 | } |
426 | } else { |
427 | uint32_t distance; |
428 | |
429 | rc_update_bit_1(rc, prob); |
430 | prob = p + LZMA_IS_REP_G1 + cst->state; |
431 | if (rc_is_bit_0(rc, prob)) { |
432 | rc_update_bit_0(rc, prob); |
433 | distance = cst->rep1; |
434 | } else { |
435 | rc_update_bit_1(rc, prob); |
436 | prob = p + LZMA_IS_REP_G2 + cst->state; |
437 | if (rc_is_bit_0(rc, prob)) { |
438 | rc_update_bit_0(rc, prob); |
439 | distance = cst->rep2; |
440 | } else { |
441 | rc_update_bit_1(rc, prob); |
442 | distance = cst->rep3; |
443 | cst->rep3 = cst->rep2; |
444 | } |
445 | cst->rep2 = cst->rep1; |
446 | } |
447 | cst->rep1 = cst->rep0; |
448 | cst->rep0 = distance; |
449 | } |
450 | cst->state = cst->state < LZMA_NUM_LIT_STATES ? 8 : 11; |
451 | prob = p + LZMA_REP_LEN_CODER; |
452 | } |
453 | |
454 | prob_len = prob + LZMA_LEN_CHOICE; |
455 | if (rc_is_bit_0(rc, prob_len)) { |
456 | rc_update_bit_0(rc, prob_len); |
457 | prob_len = (prob + LZMA_LEN_LOW |
458 | + (pos_state << |
459 | LZMA_LEN_NUM_LOW_BITS)); |
460 | offset = 0; |
461 | num_bits = LZMA_LEN_NUM_LOW_BITS; |
462 | } else { |
463 | rc_update_bit_1(rc, prob_len); |
464 | prob_len = prob + LZMA_LEN_CHOICE_2; |
465 | if (rc_is_bit_0(rc, prob_len)) { |
466 | rc_update_bit_0(rc, prob_len); |
467 | prob_len = (prob + LZMA_LEN_MID |
468 | + (pos_state << |
469 | LZMA_LEN_NUM_MID_BITS)); |
470 | offset = 1 << LZMA_LEN_NUM_LOW_BITS; |
471 | num_bits = LZMA_LEN_NUM_MID_BITS; |
472 | } else { |
473 | rc_update_bit_1(rc, prob_len); |
474 | prob_len = prob + LZMA_LEN_HIGH; |
475 | offset = ((1 << LZMA_LEN_NUM_LOW_BITS) |
476 | + (1 << LZMA_LEN_NUM_MID_BITS)); |
477 | num_bits = LZMA_LEN_NUM_HIGH_BITS; |
478 | } |
479 | } |
480 | |
481 | rc_bit_tree_decode(rc, prob_len, num_bits, &len); |
482 | len += offset; |
483 | |
484 | if (cst->state < 4) { |
485 | int pos_slot; |
486 | |
487 | cst->state += LZMA_NUM_LIT_STATES; |
488 | prob = |
489 | p + LZMA_POS_SLOT + |
490 | ((len < |
491 | LZMA_NUM_LEN_TO_POS_STATES ? len : |
492 | LZMA_NUM_LEN_TO_POS_STATES - 1) |
493 | << LZMA_NUM_POS_SLOT_BITS); |
494 | rc_bit_tree_decode(rc, prob, |
495 | LZMA_NUM_POS_SLOT_BITS, |
496 | &pos_slot); |
497 | if (pos_slot >= LZMA_START_POS_MODEL_INDEX) { |
498 | int i, mi; |
499 | num_bits = (pos_slot >> 1) - 1; |
500 | cst->rep0 = 2 | (pos_slot & 1); |
501 | if (pos_slot < LZMA_END_POS_MODEL_INDEX) { |
502 | cst->rep0 <<= num_bits; |
503 | prob = p + LZMA_SPEC_POS + |
504 | cst->rep0 - pos_slot - 1; |
505 | } else { |
506 | num_bits -= LZMA_NUM_ALIGN_BITS; |
507 | while (num_bits--) |
508 | cst->rep0 = (cst->rep0 << 1) | |
509 | rc_direct_bit(rc); |
510 | prob = p + LZMA_ALIGN; |
511 | cst->rep0 <<= LZMA_NUM_ALIGN_BITS; |
512 | num_bits = LZMA_NUM_ALIGN_BITS; |
513 | } |
514 | i = 1; |
515 | mi = 1; |
516 | while (num_bits--) { |
517 | if (rc_get_bit(rc, prob + mi, &mi)) |
518 | cst->rep0 |= i; |
519 | i <<= 1; |
520 | } |
521 | } else |
522 | cst->rep0 = pos_slot; |
523 | if (++(cst->rep0) == 0) |
524 | return; |
525 | } |
526 | |
527 | len += LZMA_MATCH_MIN_LEN; |
528 | |
529 | copy_bytes(wr, cst->rep0, len); |
530 | } |
531 | |
532 | |
533 | |
534 | STATIC inline int INIT unlzma(unsigned char *buf, int in_len, |
535 | int(*fill)(void*, unsigned int), |
536 | int(*flush)(void*, unsigned int), |
537 | unsigned char *output, |
538 | int *posp, |
539 | void(*error_fn)(char *x) |
540 | ) |
541 | { |
542 | struct lzma_header header; |
543 | int lc, pb, lp; |
544 | uint32_t pos_state_mask; |
545 | uint32_t literal_pos_mask; |
546 | uint16_t *p; |
547 | int num_probs; |
548 | struct rc rc; |
549 | int i, mi; |
550 | struct writer wr; |
551 | struct cstate cst; |
552 | unsigned char *inbuf; |
553 | int ret = -1; |
554 | |
555 | set_error_fn(error_fn); |
556 | |
557 | if (buf) |
558 | inbuf = buf; |
559 | else |
560 | inbuf = malloc(LZMA_IOBUF_SIZE); |
561 | if (!inbuf) { |
562 | error("Could not allocate input bufer"); |
563 | goto exit_0; |
564 | } |
565 | |
566 | cst.state = 0; |
567 | cst.rep0 = cst.rep1 = cst.rep2 = cst.rep3 = 1; |
568 | |
569 | wr.header = &header; |
570 | wr.flush = flush; |
571 | wr.global_pos = 0; |
572 | wr.previous_byte = 0; |
573 | wr.buffer_pos = 0; |
574 | |
575 | rc_init(&rc, fill, inbuf, in_len); |
576 | |
577 | for (i = 0; i < sizeof(header); i++) { |
578 | if (rc.ptr >= rc.buffer_end) |
579 | rc_read(&rc); |
580 | ((unsigned char *)&header)[i] = *rc.ptr++; |
581 | } |
582 | |
583 | if (header.pos >= (9 * 5 * 5)) |
584 | error("bad header"); |
585 | |
586 | mi = 0; |
587 | lc = header.pos; |
588 | while (lc >= 9) { |
589 | mi++; |
590 | lc -= 9; |
591 | } |
592 | pb = 0; |
593 | lp = mi; |
594 | while (lp >= 5) { |
595 | pb++; |
596 | lp -= 5; |
597 | } |
598 | pos_state_mask = (1 << pb) - 1; |
599 | literal_pos_mask = (1 << lp) - 1; |
600 | |
601 | ENDIAN_CONVERT(header.dict_size); |
602 | ENDIAN_CONVERT(header.dst_size); |
603 | |
604 | if (header.dict_size == 0) |
605 | header.dict_size = 1; |
606 | |
607 | if (output) |
608 | wr.buffer = output; |
609 | else { |
610 | wr.bufsize = MIN(header.dst_size, header.dict_size); |
611 | wr.buffer = large_malloc(wr.bufsize); |
612 | } |
613 | if (wr.buffer == NULL) |
614 | goto exit_1; |
615 | |
616 | num_probs = LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp)); |
617 | p = (uint16_t *) large_malloc(num_probs * sizeof(*p)); |
618 | if (p == 0) |
619 | goto exit_2; |
620 | num_probs = LZMA_LITERAL + (LZMA_LIT_SIZE << (lc + lp)); |
621 | for (i = 0; i < num_probs; i++) |
622 | p[i] = (1 << RC_MODEL_TOTAL_BITS) >> 1; |
623 | |
624 | rc_init_code(&rc); |
625 | |
626 | while (get_pos(&wr) < header.dst_size) { |
627 | int pos_state = get_pos(&wr) & pos_state_mask; |
628 | uint16_t *prob = p + LZMA_IS_MATCH + |
629 | (cst.state << LZMA_NUM_POS_BITS_MAX) + pos_state; |
630 | if (rc_is_bit_0(&rc, prob)) |
631 | process_bit0(&wr, &rc, &cst, p, pos_state, prob, |
632 | lc, literal_pos_mask); |
633 | else { |
634 | process_bit1(&wr, &rc, &cst, p, pos_state, prob); |
635 | if (cst.rep0 == 0) |
636 | break; |
637 | } |
638 | } |
639 | |
640 | if (posp) |
641 | *posp = rc.ptr-rc.buffer; |
642 | if (wr.flush) |
643 | wr.flush(wr.buffer, wr.buffer_pos); |
644 | ret = 0; |
645 | large_free(p); |
646 | exit_2: |
647 | if (!output) |
648 | large_free(wr.buffer); |
649 | exit_1: |
650 | if (!buf) |
651 | free(inbuf); |
652 | exit_0: |
653 | return ret; |
654 | } |
655 | |
656 | #ifdef PREBOOT |
657 | STATIC int INIT decompress(unsigned char *buf, int in_len, |
658 | int(*fill)(void*, unsigned int), |
659 | int(*flush)(void*, unsigned int), |
660 | unsigned char *output, |
661 | int *posp, |
662 | void(*error_fn)(char *x) |
663 | ) |
664 | { |
665 | return unlzma(buf, in_len - 4, fill, flush, output, posp, error_fn); |
666 | } |
667 | #endif |
668 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
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jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
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jz-3.16
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jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9