Commit | Line | Data |
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bc22c17e AK |
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 | * | |
d89775fc | 11 | *Based on LzmaDecode.c from the LZMA SDK 4.22 (https://www.7-zip.org/) |
bc22c17e AK |
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 | ||
b1af4315 PL |
32 | #ifdef STATIC |
33 | #define PREBOOT | |
34 | #else | |
bc22c17e AK |
35 | #include <linux/decompress/unlzma.h> |
36 | #endif /* STATIC */ | |
37 | ||
38 | #include <linux/decompress/mm.h> | |
39 | ||
1a251f52 | 40 | #ifndef MIN |
bc22c17e | 41 | #define MIN(a, b) (((a) < (b)) ? (a) : (b)) |
1a251f52 | 42 | #endif |
bc22c17e AK |
43 | |
44 | static long long INIT read_int(unsigned char *ptr, int size) | |
45 | { | |
46 | int i; | |
47 | long long ret = 0; | |
48 | ||
49 | for (i = 0; i < size; i++) | |
50 | ret = (ret << 8) | ptr[size-i-1]; | |
51 | return ret; | |
52 | } | |
53 | ||
54 | #define ENDIAN_CONVERT(x) \ | |
55 | x = (typeof(x))read_int((unsigned char *)&x, sizeof(x)) | |
56 | ||
57 | ||
58 | /* Small range coder implementation for lzma. | |
59 | *Copyright (C) 2006 Aurelien Jacobs < aurel@gnuage.org > | |
60 | * | |
d89775fc | 61 | *Based on LzmaDecode.c from the LZMA SDK 4.22 (https://www.7-zip.org/) |
bc22c17e AK |
62 | *Copyright (c) 1999-2005 Igor Pavlov |
63 | */ | |
64 | ||
65 | #include <linux/compiler.h> | |
66 | ||
67 | #define LZMA_IOBUF_SIZE 0x10000 | |
68 | ||
69 | struct rc { | |
d97b07c5 | 70 | long (*fill)(void*, unsigned long); |
bc22c17e AK |
71 | uint8_t *ptr; |
72 | uint8_t *buffer; | |
73 | uint8_t *buffer_end; | |
d97b07c5 | 74 | long buffer_size; |
bc22c17e AK |
75 | uint32_t code; |
76 | uint32_t range; | |
77 | uint32_t bound; | |
93685ad2 | 78 | void (*error)(char *); |
bc22c17e AK |
79 | }; |
80 | ||
81 | ||
82 | #define RC_TOP_BITS 24 | |
83 | #define RC_MOVE_BITS 5 | |
84 | #define RC_MODEL_TOTAL_BITS 11 | |
85 | ||
86 | ||
d97b07c5 | 87 | static long INIT nofill(void *buffer, unsigned long len) |
6a881162 PL |
88 | { |
89 | return -1; | |
90 | } | |
91 | ||
bc22c17e AK |
92 | /* Called twice: once at startup and once in rc_normalize() */ |
93 | static void INIT rc_read(struct rc *rc) | |
94 | { | |
95 | rc->buffer_size = rc->fill((char *)rc->buffer, LZMA_IOBUF_SIZE); | |
96 | if (rc->buffer_size <= 0) | |
93685ad2 | 97 | rc->error("unexpected EOF"); |
bc22c17e AK |
98 | rc->ptr = rc->buffer; |
99 | rc->buffer_end = rc->buffer + rc->buffer_size; | |
100 | } | |
101 | ||
102 | /* Called once */ | |
103 | static inline void INIT rc_init(struct rc *rc, | |
d97b07c5 YL |
104 | long (*fill)(void*, unsigned long), |
105 | char *buffer, long buffer_size) | |
bc22c17e | 106 | { |
6a881162 PL |
107 | if (fill) |
108 | rc->fill = fill; | |
109 | else | |
110 | rc->fill = nofill; | |
bc22c17e AK |
111 | rc->buffer = (uint8_t *)buffer; |
112 | rc->buffer_size = buffer_size; | |
113 | rc->buffer_end = rc->buffer + rc->buffer_size; | |
114 | rc->ptr = rc->buffer; | |
115 | ||
116 | rc->code = 0; | |
117 | rc->range = 0xFFFFFFFF; | |
118 | } | |
119 | ||
120 | static inline void INIT rc_init_code(struct rc *rc) | |
121 | { | |
122 | int i; | |
123 | ||
124 | for (i = 0; i < 5; i++) { | |
125 | if (rc->ptr >= rc->buffer_end) | |
126 | rc_read(rc); | |
127 | rc->code = (rc->code << 8) | *rc->ptr++; | |
128 | } | |
129 | } | |
130 | ||
131 | ||
bc22c17e AK |
132 | /* Called twice, but one callsite is in inline'd rc_is_bit_0_helper() */ |
133 | static void INIT rc_do_normalize(struct rc *rc) | |
134 | { | |
135 | if (rc->ptr >= rc->buffer_end) | |
136 | rc_read(rc); | |
137 | rc->range <<= 8; | |
138 | rc->code = (rc->code << 8) | *rc->ptr++; | |
139 | } | |
140 | static inline void INIT rc_normalize(struct rc *rc) | |
141 | { | |
142 | if (rc->range < (1 << RC_TOP_BITS)) | |
143 | rc_do_normalize(rc); | |
144 | } | |
145 | ||
146 | /* Called 9 times */ | |
147 | /* Why rc_is_bit_0_helper exists? | |
148 | *Because we want to always expose (rc->code < rc->bound) to optimizer | |
149 | */ | |
150 | static inline uint32_t INIT rc_is_bit_0_helper(struct rc *rc, uint16_t *p) | |
151 | { | |
152 | rc_normalize(rc); | |
153 | rc->bound = *p * (rc->range >> RC_MODEL_TOTAL_BITS); | |
154 | return rc->bound; | |
155 | } | |
156 | static inline int INIT rc_is_bit_0(struct rc *rc, uint16_t *p) | |
157 | { | |
158 | uint32_t t = rc_is_bit_0_helper(rc, p); | |
159 | return rc->code < t; | |
160 | } | |
161 | ||
162 | /* Called ~10 times, but very small, thus inlined */ | |
163 | static inline void INIT rc_update_bit_0(struct rc *rc, uint16_t *p) | |
164 | { | |
165 | rc->range = rc->bound; | |
166 | *p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS; | |
167 | } | |
6b01ed64 | 168 | static inline void INIT rc_update_bit_1(struct rc *rc, uint16_t *p) |
bc22c17e AK |
169 | { |
170 | rc->range -= rc->bound; | |
171 | rc->code -= rc->bound; | |
172 | *p -= *p >> RC_MOVE_BITS; | |
173 | } | |
174 | ||
175 | /* Called 4 times in unlzma loop */ | |
176 | static int INIT rc_get_bit(struct rc *rc, uint16_t *p, int *symbol) | |
177 | { | |
178 | if (rc_is_bit_0(rc, p)) { | |
179 | rc_update_bit_0(rc, p); | |
180 | *symbol *= 2; | |
181 | return 0; | |
182 | } else { | |
183 | rc_update_bit_1(rc, p); | |
184 | *symbol = *symbol * 2 + 1; | |
185 | return 1; | |
186 | } | |
187 | } | |
188 | ||
189 | /* Called once */ | |
190 | static inline int INIT rc_direct_bit(struct rc *rc) | |
191 | { | |
192 | rc_normalize(rc); | |
193 | rc->range >>= 1; | |
194 | if (rc->code >= rc->range) { | |
195 | rc->code -= rc->range; | |
196 | return 1; | |
197 | } | |
198 | return 0; | |
199 | } | |
200 | ||
201 | /* Called twice */ | |
202 | static inline void INIT | |
203 | rc_bit_tree_decode(struct rc *rc, uint16_t *p, int num_levels, int *symbol) | |
204 | { | |
205 | int i = num_levels; | |
206 | ||
207 | *symbol = 1; | |
208 | while (i--) | |
209 | rc_get_bit(rc, p + *symbol, symbol); | |
210 | *symbol -= 1 << num_levels; | |
211 | } | |
212 | ||
213 | ||
214 | /* | |
215 | * Small lzma deflate implementation. | |
216 | * Copyright (C) 2006 Aurelien Jacobs < aurel@gnuage.org > | |
217 | * | |
d89775fc | 218 | * Based on LzmaDecode.c from the LZMA SDK 4.22 (https://www.7-zip.org/) |
bc22c17e AK |
219 | * Copyright (C) 1999-2005 Igor Pavlov |
220 | */ | |
221 | ||
222 | ||
223 | struct lzma_header { | |
224 | uint8_t pos; | |
225 | uint32_t dict_size; | |
226 | uint64_t dst_size; | |
227 | } __attribute__ ((packed)) ; | |
228 | ||
229 | ||
230 | #define LZMA_BASE_SIZE 1846 | |
231 | #define LZMA_LIT_SIZE 768 | |
232 | ||
233 | #define LZMA_NUM_POS_BITS_MAX 4 | |
234 | ||
235 | #define LZMA_LEN_NUM_LOW_BITS 3 | |
236 | #define LZMA_LEN_NUM_MID_BITS 3 | |
237 | #define LZMA_LEN_NUM_HIGH_BITS 8 | |
238 | ||
239 | #define LZMA_LEN_CHOICE 0 | |
240 | #define LZMA_LEN_CHOICE_2 (LZMA_LEN_CHOICE + 1) | |
241 | #define LZMA_LEN_LOW (LZMA_LEN_CHOICE_2 + 1) | |
242 | #define LZMA_LEN_MID (LZMA_LEN_LOW \ | |
243 | + (1 << (LZMA_NUM_POS_BITS_MAX + LZMA_LEN_NUM_LOW_BITS))) | |
244 | #define LZMA_LEN_HIGH (LZMA_LEN_MID \ | |
245 | +(1 << (LZMA_NUM_POS_BITS_MAX + LZMA_LEN_NUM_MID_BITS))) | |
246 | #define LZMA_NUM_LEN_PROBS (LZMA_LEN_HIGH + (1 << LZMA_LEN_NUM_HIGH_BITS)) | |
247 | ||
248 | #define LZMA_NUM_STATES 12 | |
249 | #define LZMA_NUM_LIT_STATES 7 | |
250 | ||
251 | #define LZMA_START_POS_MODEL_INDEX 4 | |
252 | #define LZMA_END_POS_MODEL_INDEX 14 | |
253 | #define LZMA_NUM_FULL_DISTANCES (1 << (LZMA_END_POS_MODEL_INDEX >> 1)) | |
254 | ||
255 | #define LZMA_NUM_POS_SLOT_BITS 6 | |
256 | #define LZMA_NUM_LEN_TO_POS_STATES 4 | |
257 | ||
258 | #define LZMA_NUM_ALIGN_BITS 4 | |
259 | ||
260 | #define LZMA_MATCH_MIN_LEN 2 | |
261 | ||
262 | #define LZMA_IS_MATCH 0 | |
263 | #define LZMA_IS_REP (LZMA_IS_MATCH + (LZMA_NUM_STATES << LZMA_NUM_POS_BITS_MAX)) | |
264 | #define LZMA_IS_REP_G0 (LZMA_IS_REP + LZMA_NUM_STATES) | |
265 | #define LZMA_IS_REP_G1 (LZMA_IS_REP_G0 + LZMA_NUM_STATES) | |
266 | #define LZMA_IS_REP_G2 (LZMA_IS_REP_G1 + LZMA_NUM_STATES) | |
267 | #define LZMA_IS_REP_0_LONG (LZMA_IS_REP_G2 + LZMA_NUM_STATES) | |
268 | #define LZMA_POS_SLOT (LZMA_IS_REP_0_LONG \ | |
269 | + (LZMA_NUM_STATES << LZMA_NUM_POS_BITS_MAX)) | |
270 | #define LZMA_SPEC_POS (LZMA_POS_SLOT \ | |
271 | +(LZMA_NUM_LEN_TO_POS_STATES << LZMA_NUM_POS_SLOT_BITS)) | |
272 | #define LZMA_ALIGN (LZMA_SPEC_POS \ | |
273 | + LZMA_NUM_FULL_DISTANCES - LZMA_END_POS_MODEL_INDEX) | |
274 | #define LZMA_LEN_CODER (LZMA_ALIGN + (1 << LZMA_NUM_ALIGN_BITS)) | |
275 | #define LZMA_REP_LEN_CODER (LZMA_LEN_CODER + LZMA_NUM_LEN_PROBS) | |
276 | #define LZMA_LITERAL (LZMA_REP_LEN_CODER + LZMA_NUM_LEN_PROBS) | |
277 | ||
278 | ||
279 | struct writer { | |
280 | uint8_t *buffer; | |
281 | uint8_t previous_byte; | |
282 | size_t buffer_pos; | |
283 | int bufsize; | |
284 | size_t global_pos; | |
d97b07c5 | 285 | long (*flush)(void*, unsigned long); |
bc22c17e AK |
286 | struct lzma_header *header; |
287 | }; | |
288 | ||
289 | struct cstate { | |
290 | int state; | |
291 | uint32_t rep0, rep1, rep2, rep3; | |
292 | }; | |
293 | ||
294 | static inline size_t INIT get_pos(struct writer *wr) | |
295 | { | |
296 | return | |
297 | wr->global_pos + wr->buffer_pos; | |
298 | } | |
299 | ||
300 | static inline uint8_t INIT peek_old_byte(struct writer *wr, | |
301 | uint32_t offs) | |
302 | { | |
303 | if (!wr->flush) { | |
304 | int32_t pos; | |
305 | while (offs > wr->header->dict_size) | |
306 | offs -= wr->header->dict_size; | |
307 | pos = wr->buffer_pos - offs; | |
308 | return wr->buffer[pos]; | |
309 | } else { | |
310 | uint32_t pos = wr->buffer_pos - offs; | |
311 | while (pos >= wr->header->dict_size) | |
312 | pos += wr->header->dict_size; | |
313 | return wr->buffer[pos]; | |
314 | } | |
315 | ||
316 | } | |
317 | ||
528941ca | 318 | static inline int INIT write_byte(struct writer *wr, uint8_t byte) |
bc22c17e AK |
319 | { |
320 | wr->buffer[wr->buffer_pos++] = wr->previous_byte = byte; | |
321 | if (wr->flush && wr->buffer_pos == wr->header->dict_size) { | |
322 | wr->buffer_pos = 0; | |
323 | wr->global_pos += wr->header->dict_size; | |
528941ca LC |
324 | if (wr->flush((char *)wr->buffer, wr->header->dict_size) |
325 | != wr->header->dict_size) | |
326 | return -1; | |
bc22c17e | 327 | } |
528941ca | 328 | return 0; |
bc22c17e AK |
329 | } |
330 | ||
331 | ||
528941ca | 332 | static inline int INIT copy_byte(struct writer *wr, uint32_t offs) |
bc22c17e | 333 | { |
528941ca | 334 | return write_byte(wr, peek_old_byte(wr, offs)); |
bc22c17e AK |
335 | } |
336 | ||
528941ca | 337 | static inline int INIT copy_bytes(struct writer *wr, |
bc22c17e AK |
338 | uint32_t rep0, int len) |
339 | { | |
340 | do { | |
528941ca LC |
341 | if (copy_byte(wr, rep0)) |
342 | return -1; | |
bc22c17e AK |
343 | len--; |
344 | } while (len != 0 && wr->buffer_pos < wr->header->dst_size); | |
528941ca LC |
345 | |
346 | return len; | |
bc22c17e AK |
347 | } |
348 | ||
528941ca | 349 | static inline int INIT process_bit0(struct writer *wr, struct rc *rc, |
bc22c17e AK |
350 | struct cstate *cst, uint16_t *p, |
351 | int pos_state, uint16_t *prob, | |
352 | int lc, uint32_t literal_pos_mask) { | |
353 | int mi = 1; | |
354 | rc_update_bit_0(rc, prob); | |
355 | prob = (p + LZMA_LITERAL + | |
356 | (LZMA_LIT_SIZE | |
357 | * (((get_pos(wr) & literal_pos_mask) << lc) | |
358 | + (wr->previous_byte >> (8 - lc)))) | |
359 | ); | |
360 | ||
361 | if (cst->state >= LZMA_NUM_LIT_STATES) { | |
362 | int match_byte = peek_old_byte(wr, cst->rep0); | |
363 | do { | |
364 | int bit; | |
365 | uint16_t *prob_lit; | |
366 | ||
367 | match_byte <<= 1; | |
368 | bit = match_byte & 0x100; | |
369 | prob_lit = prob + 0x100 + bit + mi; | |
370 | if (rc_get_bit(rc, prob_lit, &mi)) { | |
371 | if (!bit) | |
372 | break; | |
373 | } else { | |
374 | if (bit) | |
375 | break; | |
376 | } | |
377 | } while (mi < 0x100); | |
378 | } | |
379 | while (mi < 0x100) { | |
380 | uint16_t *prob_lit = prob + mi; | |
381 | rc_get_bit(rc, prob_lit, &mi); | |
382 | } | |
bc22c17e AK |
383 | if (cst->state < 4) |
384 | cst->state = 0; | |
385 | else if (cst->state < 10) | |
386 | cst->state -= 3; | |
387 | else | |
388 | cst->state -= 6; | |
528941ca LC |
389 | |
390 | return write_byte(wr, mi); | |
bc22c17e AK |
391 | } |
392 | ||
528941ca | 393 | static inline int INIT process_bit1(struct writer *wr, struct rc *rc, |
bc22c17e AK |
394 | struct cstate *cst, uint16_t *p, |
395 | int pos_state, uint16_t *prob) { | |
b8cf2027 | 396 | int offset; |
bc22c17e AK |
397 | uint16_t *prob_len; |
398 | int num_bits; | |
399 | int len; | |
400 | ||
401 | rc_update_bit_1(rc, prob); | |
402 | prob = p + LZMA_IS_REP + cst->state; | |
403 | if (rc_is_bit_0(rc, prob)) { | |
404 | rc_update_bit_0(rc, prob); | |
405 | cst->rep3 = cst->rep2; | |
406 | cst->rep2 = cst->rep1; | |
407 | cst->rep1 = cst->rep0; | |
408 | cst->state = cst->state < LZMA_NUM_LIT_STATES ? 0 : 3; | |
409 | prob = p + LZMA_LEN_CODER; | |
410 | } else { | |
411 | rc_update_bit_1(rc, prob); | |
412 | prob = p + LZMA_IS_REP_G0 + cst->state; | |
413 | if (rc_is_bit_0(rc, prob)) { | |
414 | rc_update_bit_0(rc, prob); | |
415 | prob = (p + LZMA_IS_REP_0_LONG | |
416 | + (cst->state << | |
417 | LZMA_NUM_POS_BITS_MAX) + | |
418 | pos_state); | |
419 | if (rc_is_bit_0(rc, prob)) { | |
420 | rc_update_bit_0(rc, prob); | |
421 | ||
422 | cst->state = cst->state < LZMA_NUM_LIT_STATES ? | |
423 | 9 : 11; | |
528941ca | 424 | return copy_byte(wr, cst->rep0); |
bc22c17e AK |
425 | } else { |
426 | rc_update_bit_1(rc, prob); | |
427 | } | |
428 | } else { | |
429 | uint32_t distance; | |
430 | ||
431 | rc_update_bit_1(rc, prob); | |
432 | prob = p + LZMA_IS_REP_G1 + cst->state; | |
433 | if (rc_is_bit_0(rc, prob)) { | |
434 | rc_update_bit_0(rc, prob); | |
435 | distance = cst->rep1; | |
436 | } else { | |
437 | rc_update_bit_1(rc, prob); | |
438 | prob = p + LZMA_IS_REP_G2 + cst->state; | |
439 | if (rc_is_bit_0(rc, prob)) { | |
440 | rc_update_bit_0(rc, prob); | |
441 | distance = cst->rep2; | |
442 | } else { | |
443 | rc_update_bit_1(rc, prob); | |
444 | distance = cst->rep3; | |
445 | cst->rep3 = cst->rep2; | |
446 | } | |
447 | cst->rep2 = cst->rep1; | |
448 | } | |
449 | cst->rep1 = cst->rep0; | |
450 | cst->rep0 = distance; | |
451 | } | |
452 | cst->state = cst->state < LZMA_NUM_LIT_STATES ? 8 : 11; | |
453 | prob = p + LZMA_REP_LEN_CODER; | |
454 | } | |
455 | ||
456 | prob_len = prob + LZMA_LEN_CHOICE; | |
457 | if (rc_is_bit_0(rc, prob_len)) { | |
458 | rc_update_bit_0(rc, prob_len); | |
459 | prob_len = (prob + LZMA_LEN_LOW | |
460 | + (pos_state << | |
461 | LZMA_LEN_NUM_LOW_BITS)); | |
462 | offset = 0; | |
463 | num_bits = LZMA_LEN_NUM_LOW_BITS; | |
464 | } else { | |
465 | rc_update_bit_1(rc, prob_len); | |
466 | prob_len = prob + LZMA_LEN_CHOICE_2; | |
467 | if (rc_is_bit_0(rc, prob_len)) { | |
468 | rc_update_bit_0(rc, prob_len); | |
469 | prob_len = (prob + LZMA_LEN_MID | |
470 | + (pos_state << | |
471 | LZMA_LEN_NUM_MID_BITS)); | |
472 | offset = 1 << LZMA_LEN_NUM_LOW_BITS; | |
473 | num_bits = LZMA_LEN_NUM_MID_BITS; | |
474 | } else { | |
475 | rc_update_bit_1(rc, prob_len); | |
476 | prob_len = prob + LZMA_LEN_HIGH; | |
477 | offset = ((1 << LZMA_LEN_NUM_LOW_BITS) | |
478 | + (1 << LZMA_LEN_NUM_MID_BITS)); | |
479 | num_bits = LZMA_LEN_NUM_HIGH_BITS; | |
480 | } | |
481 | } | |
482 | ||
483 | rc_bit_tree_decode(rc, prob_len, num_bits, &len); | |
484 | len += offset; | |
485 | ||
486 | if (cst->state < 4) { | |
487 | int pos_slot; | |
488 | ||
489 | cst->state += LZMA_NUM_LIT_STATES; | |
490 | prob = | |
491 | p + LZMA_POS_SLOT + | |
492 | ((len < | |
493 | LZMA_NUM_LEN_TO_POS_STATES ? len : | |
494 | LZMA_NUM_LEN_TO_POS_STATES - 1) | |
495 | << LZMA_NUM_POS_SLOT_BITS); | |
496 | rc_bit_tree_decode(rc, prob, | |
497 | LZMA_NUM_POS_SLOT_BITS, | |
498 | &pos_slot); | |
499 | if (pos_slot >= LZMA_START_POS_MODEL_INDEX) { | |
500 | int i, mi; | |
501 | num_bits = (pos_slot >> 1) - 1; | |
502 | cst->rep0 = 2 | (pos_slot & 1); | |
503 | if (pos_slot < LZMA_END_POS_MODEL_INDEX) { | |
504 | cst->rep0 <<= num_bits; | |
505 | prob = p + LZMA_SPEC_POS + | |
506 | cst->rep0 - pos_slot - 1; | |
507 | } else { | |
508 | num_bits -= LZMA_NUM_ALIGN_BITS; | |
509 | while (num_bits--) | |
510 | cst->rep0 = (cst->rep0 << 1) | | |
511 | rc_direct_bit(rc); | |
512 | prob = p + LZMA_ALIGN; | |
513 | cst->rep0 <<= LZMA_NUM_ALIGN_BITS; | |
514 | num_bits = LZMA_NUM_ALIGN_BITS; | |
515 | } | |
516 | i = 1; | |
517 | mi = 1; | |
518 | while (num_bits--) { | |
519 | if (rc_get_bit(rc, prob + mi, &mi)) | |
520 | cst->rep0 |= i; | |
521 | i <<= 1; | |
522 | } | |
523 | } else | |
524 | cst->rep0 = pos_slot; | |
525 | if (++(cst->rep0) == 0) | |
528941ca | 526 | return 0; |
eb0cf3e1 LC |
527 | if (cst->rep0 > wr->header->dict_size |
528 | || cst->rep0 > get_pos(wr)) | |
529 | return -1; | |
bc22c17e AK |
530 | } |
531 | ||
532 | len += LZMA_MATCH_MIN_LEN; | |
533 | ||
528941ca | 534 | return copy_bytes(wr, cst->rep0, len); |
bc22c17e AK |
535 | } |
536 | ||
537 | ||
538 | ||
d97b07c5 YL |
539 | STATIC inline int INIT unlzma(unsigned char *buf, long in_len, |
540 | long (*fill)(void*, unsigned long), | |
541 | long (*flush)(void*, unsigned long), | |
bc22c17e | 542 | unsigned char *output, |
d97b07c5 | 543 | long *posp, |
93685ad2 | 544 | void(*error)(char *x) |
bc22c17e AK |
545 | ) |
546 | { | |
547 | struct lzma_header header; | |
548 | int lc, pb, lp; | |
549 | uint32_t pos_state_mask; | |
550 | uint32_t literal_pos_mask; | |
551 | uint16_t *p; | |
552 | int num_probs; | |
553 | struct rc rc; | |
554 | int i, mi; | |
555 | struct writer wr; | |
556 | struct cstate cst; | |
557 | unsigned char *inbuf; | |
558 | int ret = -1; | |
559 | ||
93685ad2 | 560 | rc.error = error; |
b1af4315 | 561 | |
bc22c17e AK |
562 | if (buf) |
563 | inbuf = buf; | |
564 | else | |
565 | inbuf = malloc(LZMA_IOBUF_SIZE); | |
566 | if (!inbuf) { | |
90802ed9 | 567 | error("Could not allocate input buffer"); |
bc22c17e AK |
568 | goto exit_0; |
569 | } | |
570 | ||
571 | cst.state = 0; | |
572 | cst.rep0 = cst.rep1 = cst.rep2 = cst.rep3 = 1; | |
573 | ||
574 | wr.header = &header; | |
575 | wr.flush = flush; | |
576 | wr.global_pos = 0; | |
577 | wr.previous_byte = 0; | |
578 | wr.buffer_pos = 0; | |
579 | ||
580 | rc_init(&rc, fill, inbuf, in_len); | |
581 | ||
582 | for (i = 0; i < sizeof(header); i++) { | |
583 | if (rc.ptr >= rc.buffer_end) | |
584 | rc_read(&rc); | |
585 | ((unsigned char *)&header)[i] = *rc.ptr++; | |
586 | } | |
587 | ||
8218a437 | 588 | if (header.pos >= (9 * 5 * 5)) { |
bc22c17e | 589 | error("bad header"); |
8218a437 LC |
590 | goto exit_1; |
591 | } | |
bc22c17e AK |
592 | |
593 | mi = 0; | |
594 | lc = header.pos; | |
595 | while (lc >= 9) { | |
596 | mi++; | |
597 | lc -= 9; | |
598 | } | |
599 | pb = 0; | |
600 | lp = mi; | |
601 | while (lp >= 5) { | |
602 | pb++; | |
603 | lp -= 5; | |
604 | } | |
605 | pos_state_mask = (1 << pb) - 1; | |
606 | literal_pos_mask = (1 << lp) - 1; | |
607 | ||
608 | ENDIAN_CONVERT(header.dict_size); | |
609 | ENDIAN_CONVERT(header.dst_size); | |
610 | ||
611 | if (header.dict_size == 0) | |
612 | header.dict_size = 1; | |
613 | ||
614 | if (output) | |
615 | wr.buffer = output; | |
616 | else { | |
617 | wr.bufsize = MIN(header.dst_size, header.dict_size); | |
618 | wr.buffer = large_malloc(wr.bufsize); | |
619 | } | |
620 | if (wr.buffer == NULL) | |
621 | goto exit_1; | |
622 | ||
623 | num_probs = LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp)); | |
624 | p = (uint16_t *) large_malloc(num_probs * sizeof(*p)); | |
e4e29dc4 | 625 | if (p == NULL) |
bc22c17e AK |
626 | goto exit_2; |
627 | num_probs = LZMA_LITERAL + (LZMA_LIT_SIZE << (lc + lp)); | |
628 | for (i = 0; i < num_probs; i++) | |
629 | p[i] = (1 << RC_MODEL_TOTAL_BITS) >> 1; | |
630 | ||
631 | rc_init_code(&rc); | |
632 | ||
633 | while (get_pos(&wr) < header.dst_size) { | |
634 | int pos_state = get_pos(&wr) & pos_state_mask; | |
635 | uint16_t *prob = p + LZMA_IS_MATCH + | |
636 | (cst.state << LZMA_NUM_POS_BITS_MAX) + pos_state; | |
528941ca LC |
637 | if (rc_is_bit_0(&rc, prob)) { |
638 | if (process_bit0(&wr, &rc, &cst, p, pos_state, prob, | |
639 | lc, literal_pos_mask)) { | |
640 | error("LZMA data is corrupt"); | |
641 | goto exit_3; | |
642 | } | |
643 | } else { | |
644 | if (process_bit1(&wr, &rc, &cst, p, pos_state, prob)) { | |
645 | error("LZMA data is corrupt"); | |
646 | goto exit_3; | |
647 | } | |
bc22c17e AK |
648 | if (cst.rep0 == 0) |
649 | break; | |
650 | } | |
278208d9 LC |
651 | if (rc.buffer_size <= 0) |
652 | goto exit_3; | |
bc22c17e AK |
653 | } |
654 | ||
655 | if (posp) | |
656 | *posp = rc.ptr-rc.buffer; | |
528941ca LC |
657 | if (!wr.flush || wr.flush(wr.buffer, wr.buffer_pos) == wr.buffer_pos) |
658 | ret = 0; | |
278208d9 | 659 | exit_3: |
bc22c17e AK |
660 | large_free(p); |
661 | exit_2: | |
662 | if (!output) | |
663 | large_free(wr.buffer); | |
664 | exit_1: | |
665 | if (!buf) | |
666 | free(inbuf); | |
667 | exit_0: | |
668 | return ret; | |
669 | } | |
670 | ||
b1af4315 | 671 | #ifdef PREBOOT |
2d3862d2 | 672 | STATIC int INIT __decompress(unsigned char *buf, long in_len, |
d97b07c5 YL |
673 | long (*fill)(void*, unsigned long), |
674 | long (*flush)(void*, unsigned long), | |
2d3862d2 | 675 | unsigned char *output, long out_len, |
d97b07c5 | 676 | long *posp, |
2d3862d2 | 677 | void (*error)(char *x)) |
b1af4315 | 678 | { |
93685ad2 | 679 | return unlzma(buf, in_len - 4, fill, flush, output, posp, error); |
b1af4315 PL |
680 | } |
681 | #endif |