summaryrefslogtreecommitdiff
path: root/target/linux/generic-2.6/patches-2.6.32/960-arm_lzma_loader.patch
blob: 5f4f28757b7aec16d7c486c53670a3f0ee8325de (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -63,7 +63,7 @@ endif
 
 SEDFLAGS	= s/TEXT_START/$(ZTEXTADDR)/;s/BSS_START/$(ZBSSADDR)/
 
-targets       := vmlinux vmlinux.lds piggy.gz piggy.o font.o font.c \
+targets       := vmlinux vmlinux.lds piggy.lzma piggy.o font.o font.c \
 		 head.o misc.o $(OBJS)
 
 ifeq ($(CONFIG_FUNCTION_TRACER),y)
@@ -99,10 +99,10 @@ $(obj)/vmlinux: $(obj)/vmlinux.lds $(obj
 	$(call if_changed,ld)
 	@:
 
-$(obj)/piggy.gz: $(obj)/../Image FORCE
-	$(call if_changed,gzip)
+$(obj)/piggy.lzma: $(obj)/../Image FORCE
+	$(call if_changed,lzma)
 
-$(obj)/piggy.o:  $(obj)/piggy.gz FORCE
+$(obj)/piggy.o:  $(obj)/piggy.lzma FORCE
 
 CFLAGS_font.o := -Dstatic=
 
--- a/arch/arm/boot/compressed/misc.c
+++ b/arch/arm/boot/compressed/misc.c
@@ -185,36 +185,10 @@ static inline __ptr_t memcpy(__ptr_t __d
 	return __dest;
 }
 
-/*
- * gzip delarations
- */
-#define OF(args)  args
-#define STATIC static
-
-typedef unsigned char  uch;
-typedef unsigned short ush;
-typedef unsigned long  ulg;
-
-#define WSIZE 0x8000		/* Window size must be at least 32k, */
+#define WSIZE 0x20000		/* Window size must be at least 128k, */
 				/* and a power of two */
 
-static uch *inbuf;		/* input buffer */
-static uch window[WSIZE];	/* Sliding window buffer */
-
-static unsigned insize;		/* valid bytes in inbuf */
-static unsigned inptr;		/* index of next byte to be processed in inbuf */
-static unsigned outcnt;		/* bytes in output buffer */
-
-/* gzip flag byte */
-#define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
-#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
-#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
-#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
-#define COMMENT      0x10 /* bit 4 set: file comment present */
-#define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
-#define RESERVED     0xC0 /* bit 6,7:   reserved */
-
-#define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
+static u8 window[WSIZE];	/* Sliding window buffer */
 
 /* Diagnostic functions */
 #ifdef DEBUG
@@ -233,24 +207,21 @@ static unsigned outcnt;		/* bytes in out
 #  define Tracecv(c,x)
 #endif
 
-static int  fill_inbuf(void);
-static void flush_window(void);
 static void error(char *m);
 
 extern char input_data[];
 extern char input_data_end[];
 
-static uch *output_data;
-static ulg output_ptr;
-static ulg bytes_out;
+static unsigned long output_ptr;
+static unsigned long bytes_out;
 
 static void error(char *m);
 
 static void putstr(const char *);
 
 extern int end;
-static ulg free_mem_ptr;
-static ulg free_mem_end_ptr;
+static unsigned long free_mem_ptr;
+static unsigned long free_mem_end_ptr;
 
 #ifdef STANDALONE_DEBUG
 #define NO_INFLATE_MALLOC
@@ -258,50 +229,10 @@ static ulg free_mem_end_ptr;
 
 #define ARCH_HAS_DECOMP_WDOG
 
-#include "../../../../lib/inflate.c"
-
-/* ===========================================================================
- * Fill the input buffer. This is called only when the buffer is empty
- * and at least one byte is really needed.
- */
-int fill_inbuf(void)
-{
-	if (insize != 0)
-		error("ran out of input data");
-
-	inbuf = input_data;
-	insize = &input_data_end[0] - &input_data[0];
-
-	inptr = 1;
-	return inbuf[0];
-}
-
-/* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
- * (Used for the decompressed data only.)
- */
-void flush_window(void)
-{
-	ulg c = crc;
-	unsigned n;
-	uch *in, *out, ch;
-
-	in = window;
-	out = &output_data[output_ptr];
-	for (n = 0; n < outcnt; n++) {
-		ch = *out++ = *in++;
-		c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
-	}
-	crc = c;
-	bytes_out += (ulg)outcnt;
-	output_ptr += (ulg)outcnt;
-	outcnt = 0;
-	putstr(".");
-}
-
 #ifndef arch_error
 #define arch_error(x)
 #endif
+#include "unlzma.c"
 
 static void error(char *x)
 {
@@ -316,20 +247,16 @@ static void error(char *x)
 
 #ifndef STANDALONE_DEBUG
 
-ulg
-decompress_kernel(ulg output_start, ulg free_mem_ptr_p, ulg free_mem_ptr_end_p,
+unsigned long
+decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p, unsigned long free_mem_ptr_end_p,
 		  int arch_id)
 {
-	output_data		= (uch *)output_start;	/* Points to kernel start */
-	free_mem_ptr		= free_mem_ptr_p;
-	free_mem_end_ptr	= free_mem_ptr_end_p;
 	__machine_arch_type	= arch_id;
 
 	arch_decomp_setup();
 
-	makecrc();
 	putstr("Uncompressing Linux...");
-	gunzip();
+	output_ptr += unlzma((u8 *) output_start, input_data, window);
 	putstr(" done, booting the kernel.\n");
 	return output_ptr;
 }
@@ -339,11 +266,8 @@ char output_buffer[1500*1024];
 
 int main()
 {
-	output_data = output_buffer;
-
-	makecrc();
 	putstr("Uncompressing Linux...");
-	gunzip();
+	unlzma((u8 *) output_buffer, input_data, window);
 	putstr("done.\n");
 	return 0;
 }
--- a/arch/arm/boot/compressed/piggy.S
+++ b/arch/arm/boot/compressed/piggy.S
@@ -1,6 +1,6 @@
 	.section .piggydata,#alloc
 	.globl	input_data
 input_data:
-	.incbin	"arch/arm/boot/compressed/piggy.gz"
+	.incbin	"arch/arm/boot/compressed/piggy.lzma"
 	.globl	input_data_end
 input_data_end:
--- /dev/null
+++ b/arch/arm/boot/compressed/unlzma.c
@@ -0,0 +1,429 @@
+/*
+ * Copyright (c) 2009  Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * uncompress.c
+ */
+
+#include <linux/types.h>
+#include <asm/byteorder.h>
+#include "unlzma.h"
+
+struct unlzma_ctx {
+	const u8 *next_in;
+	u8 *next_out;
+	u8 *outbuf;
+
+	/* reader state */
+	u32 code;
+	u32 range;
+	u32 bound;
+
+	/* writer state */
+	u8 previous_byte;
+	ssize_t pos;
+
+	/* cstate */
+	int state;
+	u32 rep0, rep1, rep2, rep3;
+
+	void *workspace;
+} ctx;
+
+static int inbs = 0;
+static inline u8
+rc_read(void)
+{
+#if 0
+	if (unlikely(++inbs > 16 * 1024)) {
+		putstr(".");
+		inbs = 0;
+	}
+#endif
+	return *(ctx.next_in++);
+}
+
+
+static inline void
+rc_get_code(void)
+{
+	ctx.code = (ctx.code << 8) | rc_read();
+}
+
+static inline void
+rc_normalize(void)
+{
+	if (ctx.range < (1 << RC_TOP_BITS)) {
+		ctx.range <<= 8;
+		rc_get_code();
+	}
+}
+
+static inline int
+rc_is_bit_0(u16 *p)
+{
+	rc_normalize();
+	ctx.bound = *p * (ctx.range >> RC_MODEL_TOTAL_BITS);
+	return ctx.code < ctx.bound;
+}
+
+static inline void
+rc_update_bit_0(u16 *p)
+{
+	ctx.range = ctx.bound;
+	*p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS;
+}
+
+static inline void
+rc_update_bit_1(u16 *p)
+{
+	ctx.range -= ctx.bound;
+	ctx.code -= ctx.bound;
+	*p -= *p >> RC_MOVE_BITS;
+}
+
+static inline bool
+rc_get_bit(u16 *p, int *symbol)
+{
+	if (rc_is_bit_0(p)) {
+		rc_update_bit_0(p);
+		*symbol *= 2;
+		return 0;
+	} else {
+		rc_update_bit_1(p);
+		*symbol = *symbol * 2 + 1;
+		return 1;
+	}
+}
+
+static inline int
+rc_direct_bit(void)
+{
+	rc_normalize();
+	ctx.range >>= 1;
+	if (ctx.code >= ctx.range) {
+		ctx.code -= ctx.range;
+		return 1;
+	}
+	return 0;
+}
+
+static inline void
+rc_bit_tree_decode(u16 *p, int num_levels, int *symbol)
+{
+	int i = num_levels;
+
+	*symbol = 1;
+	while (i--)
+		rc_get_bit(p + *symbol, symbol);
+	*symbol -= 1 << num_levels;
+}
+
+static inline u8
+peek_old_byte(u32 offs)
+{
+	u32 pos = ctx.pos - offs;
+	return ctx.outbuf[pos];
+}
+
+static inline void
+write_byte(u8 byte)
+{
+	ctx.previous_byte = byte;
+	*(ctx.next_out++) = byte;
+	ctx.pos++;
+}
+
+
+static inline void
+copy_byte(u32 offs)
+{
+	write_byte(peek_old_byte(offs));
+}
+
+static inline void
+copy_bytes(u32 rep0, int len)
+{
+	do {
+		copy_byte(rep0);
+		len--;
+	} while (len != 0);
+}
+
+static inline void
+process_bit0(u16 *p, int pos_state, u16 *prob,
+             int lc, u32 literal_pos_mask)
+{
+	int mi = 1;
+	rc_update_bit_0(prob);
+	prob = (p + LZMA_LITERAL +
+		(LZMA_LIT_SIZE
+		 * (((ctx.pos & literal_pos_mask) << lc)
+		    + (ctx.previous_byte >> (8 - lc))))
+		);
+
+	if (ctx.state >= LZMA_NUM_LIT_STATES) {
+		int match_byte = peek_old_byte(ctx.rep0);
+		do {
+			u16 bit;
+			u16 *prob_lit;
+
+			match_byte <<= 1;
+			bit = match_byte & 0x100;
+			prob_lit = prob + 0x100 + bit + mi;
+			if (rc_get_bit(prob_lit, &mi) != !!bit)
+				break;
+		} while (mi < 0x100);
+	}
+	while (mi < 0x100) {
+		u16 *prob_lit = prob + mi;
+		rc_get_bit(prob_lit, &mi);
+	}
+	write_byte(mi);
+	if (ctx.state < 4)
+		ctx.state = 0;
+	else if (ctx.state < 10)
+		ctx.state -= 3;
+	else
+		ctx.state -= 6;
+}
+
+static inline void
+process_bit1(u16 *p, int pos_state, u16 *prob)
+{
+	int offset;
+	u16 *prob_len;
+	int num_bits;
+	int len;
+
+	rc_update_bit_1(prob);
+	prob = p + LZMA_IS_REP + ctx.state;
+	if (rc_is_bit_0(prob)) {
+		rc_update_bit_0(prob);
+		ctx.rep3 = ctx.rep2;
+		ctx.rep2 = ctx.rep1;
+		ctx.rep1 = ctx.rep0;
+		ctx.state = ctx.state < LZMA_NUM_LIT_STATES ? 0 : 3;
+		prob = p + LZMA_LEN_CODER;
+	} else {
+		rc_update_bit_1(prob);
+		prob = p + LZMA_IS_REP_G0 + ctx.state;
+		if (rc_is_bit_0(prob)) {
+			rc_update_bit_0(prob);
+			prob = (p + LZMA_IS_REP_0_LONG
+				+ (ctx.state <<
+				   LZMA_NUM_POS_BITS_MAX) +
+				pos_state);
+			if (rc_is_bit_0(prob)) {
+				rc_update_bit_0(prob);
+
+				ctx.state = ctx.state < LZMA_NUM_LIT_STATES ?
+					9 : 11;
+				copy_byte(ctx.rep0);
+				return;
+			} else {
+				rc_update_bit_1(prob);
+			}
+		} else {
+			u32 distance;
+
+			rc_update_bit_1(prob);
+			prob = p + LZMA_IS_REP_G1 + ctx.state;
+			if (rc_is_bit_0(prob)) {
+				rc_update_bit_0(prob);
+				distance = ctx.rep1;
+			} else {
+				rc_update_bit_1(prob);
+				prob = p + LZMA_IS_REP_G2 + ctx.state;
+				if (rc_is_bit_0(prob)) {
+					rc_update_bit_0(prob);
+					distance = ctx.rep2;
+				} else {
+					rc_update_bit_1(prob);
+					distance = ctx.rep3;
+					ctx.rep3 = ctx.rep2;
+				}
+				ctx.rep2 = ctx.rep1;
+			}
+			ctx.rep1 = ctx.rep0;
+			ctx.rep0 = distance;
+		}
+		ctx.state = ctx.state < LZMA_NUM_LIT_STATES ? 8 : 11;
+		prob = p + LZMA_REP_LEN_CODER;
+	}
+
+	prob_len = prob + LZMA_LEN_CHOICE;
+	if (rc_is_bit_0(prob_len)) {
+		rc_update_bit_0(prob_len);
+		prob_len = (prob + LZMA_LEN_LOW
+			    + (pos_state <<
+			       LZMA_LEN_NUM_LOW_BITS));
+		offset = 0;
+		num_bits = LZMA_LEN_NUM_LOW_BITS;
+	} else {
+		rc_update_bit_1(prob_len);
+		prob_len = prob + LZMA_LEN_CHOICE_2;
+		if (rc_is_bit_0(prob_len)) {
+			rc_update_bit_0(prob_len);
+			prob_len = (prob + LZMA_LEN_MID
+				    + (pos_state <<
+				       LZMA_LEN_NUM_MID_BITS));
+			offset = 1 << LZMA_LEN_NUM_LOW_BITS;
+			num_bits = LZMA_LEN_NUM_MID_BITS;
+		} else {
+			rc_update_bit_1(prob_len);
+			prob_len = prob + LZMA_LEN_HIGH;
+			offset = ((1 << LZMA_LEN_NUM_LOW_BITS)
+				  + (1 << LZMA_LEN_NUM_MID_BITS));
+			num_bits = LZMA_LEN_NUM_HIGH_BITS;
+		}
+	}
+
+	rc_bit_tree_decode(prob_len, num_bits, &len);
+	len += offset;
+
+	if (ctx.state < 4) {
+		int pos_slot;
+
+		ctx.state += LZMA_NUM_LIT_STATES;
+		prob =
+			p + LZMA_POS_SLOT +
+			((len <
+			  LZMA_NUM_LEN_TO_POS_STATES ? len :
+			  LZMA_NUM_LEN_TO_POS_STATES - 1)
+			 << LZMA_NUM_POS_SLOT_BITS);
+		rc_bit_tree_decode(prob,
+				   LZMA_NUM_POS_SLOT_BITS,
+				   &pos_slot);
+		if (pos_slot >= LZMA_START_POS_MODEL_INDEX) {
+			int i, mi;
+			num_bits = (pos_slot >> 1) - 1;
+			ctx.rep0 = 2 | (pos_slot & 1);
+			if (pos_slot < LZMA_END_POS_MODEL_INDEX) {
+				ctx.rep0 <<= num_bits;
+				prob = p + LZMA_SPEC_POS +
+					ctx.rep0 - pos_slot - 1;
+			} else {
+				num_bits -= LZMA_NUM_ALIGN_BITS;
+				while (num_bits--)
+					ctx.rep0 = (ctx.rep0 << 1) |
+						rc_direct_bit();
+				prob = p + LZMA_ALIGN;
+				ctx.rep0 <<= LZMA_NUM_ALIGN_BITS;
+				num_bits = LZMA_NUM_ALIGN_BITS;
+			}
+			i = 1;
+			mi = 1;
+			while (num_bits--) {
+				if (rc_get_bit(prob + mi, &mi))
+					ctx.rep0 |= i;
+				i <<= 1;
+			}
+		} else
+			ctx.rep0 = pos_slot;
+		if (++(ctx.rep0) == 0)
+			return;
+	}
+
+	len += LZMA_MATCH_MIN_LEN;
+
+	copy_bytes(ctx.rep0, len);
+}
+
+
+static int
+do_unlzma(void)
+{
+	u8 hdr_buf[sizeof(struct lzma_header)];
+	struct lzma_header *header = (struct lzma_header *)hdr_buf;
+	u32 pos_state_mask;
+	u32 literal_pos_mask;
+	int lc, pb, lp;
+	int num_probs;
+	int i, mi;
+	u16 *p;
+
+	for (i = 0; i < sizeof(struct lzma_header); i++) {
+		hdr_buf[i] = rc_read();
+	}
+
+	ctx.pos = 0;
+	ctx.state = 0;
+	ctx.rep0 = ctx.rep1 = ctx.rep2 = ctx.rep3 = 1;
+
+	ctx.previous_byte = 0;
+	ctx.code = 0;
+	ctx.range = 0xFFFFFFFF;
+
+	if (header->pos >= (9 * 5 * 5))
+		return -1;
+
+	mi = 0;
+	lc = header->pos;
+	while (lc >= 9) {
+		mi++;
+		lc -= 9;
+	}
+	pb = 0;
+	lp = mi;
+	while (lp >= 5) {
+		pb++;
+		lp -= 5;
+	}
+	pos_state_mask = (1 << pb) - 1;
+	literal_pos_mask = (1 << lp) - 1;
+
+	p = (u16 *) ctx.workspace;
+	if (!p)
+		return -1;
+
+	num_probs = LZMA_LITERAL + (LZMA_LIT_SIZE << (lc + lp));
+	for (i = 0; i < num_probs; i++)
+		p[i] = (1 << RC_MODEL_TOTAL_BITS) >> 1;
+
+	for (i = 0; i < 5; i++)
+		rc_get_code();
+
+	while (1) {
+		int pos_state =	ctx.pos & pos_state_mask;
+		u16 *prob = p + LZMA_IS_MATCH +
+			(ctx.state << LZMA_NUM_POS_BITS_MAX) + pos_state;
+		if (rc_is_bit_0(prob))
+			process_bit0(p, pos_state, prob,
+				     lc, literal_pos_mask);
+		else {
+			process_bit1(p, pos_state, prob);
+			if (ctx.rep0 == 0)
+				break;
+		}
+	}
+
+	return ctx.pos;
+}
+
+
+static int unlzma(unsigned char *dest, const unsigned char *src, unsigned char *workspace)
+{
+	memset(&ctx, 0, sizeof(ctx));
+	ctx.outbuf = dest;
+	ctx.next_in = src;
+	ctx.next_out = dest;
+	ctx.workspace = workspace;
+
+	return do_unlzma();
+}
+
+
--- /dev/null
+++ b/arch/arm/boot/compressed/unlzma.h
@@ -0,0 +1,81 @@
+/* LZMA uncompresion module for pcomp
+ * Copyright (C) 2009  Felix Fietkau <nbd@openwrt.org>
+ *
+ * Based on:
+ *  Initial Linux kernel adaptation
+ *  Copyright (C) 2006  Alain < alain@knaff.lu >
+ *
+ *  Based on small lzma deflate implementation/Small range coder
+ *  implementation for lzma.
+ *  Copyright (C) 2006  Aurelien Jacobs < aurel@gnuage.org >
+ *
+ *  Based on LzmaDecode.c from the LZMA SDK 4.22 (http://www.7-zip.org/)
+ *  Copyright (C) 1999-2005  Igor Pavlov
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+#ifndef __UNLZMA_H
+#define __UNLZMA_H
+
+struct lzma_header {
+	__u8 pos;
+	__le32 dict_size;
+	__le64 uncompr_size;
+} __attribute__ ((packed));
+
+
+#define RC_TOP_BITS 24
+#define RC_MOVE_BITS 5
+#define RC_MODEL_TOTAL_BITS 11
+
+#define LZMA_BASE_SIZE 1846
+#define LZMA_LIT_SIZE 768
+
+#define LZMA_NUM_POS_BITS_MAX 4
+
+#define LZMA_LEN_NUM_LOW_BITS 3
+#define LZMA_LEN_NUM_MID_BITS 3
+#define LZMA_LEN_NUM_HIGH_BITS 8
+
+#define LZMA_LEN_CHOICE 0
+#define LZMA_LEN_CHOICE_2 (LZMA_LEN_CHOICE + 1)
+#define LZMA_LEN_LOW (LZMA_LEN_CHOICE_2 + 1)
+#define LZMA_LEN_MID (LZMA_LEN_LOW \
+		      + (1 << (LZMA_NUM_POS_BITS_MAX + LZMA_LEN_NUM_LOW_BITS)))
+#define LZMA_LEN_HIGH (LZMA_LEN_MID \
+		       +(1 << (LZMA_NUM_POS_BITS_MAX + LZMA_LEN_NUM_MID_BITS)))
+#define LZMA_NUM_LEN_PROBS (LZMA_LEN_HIGH + (1 << LZMA_LEN_NUM_HIGH_BITS))
+
+#define LZMA_NUM_STATES 12
+#define LZMA_NUM_LIT_STATES 7
+
+#define LZMA_START_POS_MODEL_INDEX 4
+#define LZMA_END_POS_MODEL_INDEX 14
+#define LZMA_NUM_FULL_DISTANCES (1 << (LZMA_END_POS_MODEL_INDEX >> 1))
+
+#define LZMA_NUM_POS_SLOT_BITS 6
+#define LZMA_NUM_LEN_TO_POS_STATES 4
+
+#define LZMA_NUM_ALIGN_BITS 4
+
+#define LZMA_MATCH_MIN_LEN 2
+
+#define LZMA_IS_MATCH 0
+#define LZMA_IS_REP (LZMA_IS_MATCH + (LZMA_NUM_STATES << LZMA_NUM_POS_BITS_MAX))
+#define LZMA_IS_REP_G0 (LZMA_IS_REP + LZMA_NUM_STATES)
+#define LZMA_IS_REP_G1 (LZMA_IS_REP_G0 + LZMA_NUM_STATES)
+#define LZMA_IS_REP_G2 (LZMA_IS_REP_G1 + LZMA_NUM_STATES)
+#define LZMA_IS_REP_0_LONG (LZMA_IS_REP_G2 + LZMA_NUM_STATES)
+#define LZMA_POS_SLOT (LZMA_IS_REP_0_LONG \
+		       + (LZMA_NUM_STATES << LZMA_NUM_POS_BITS_MAX))
+#define LZMA_SPEC_POS (LZMA_POS_SLOT \
+		       +(LZMA_NUM_LEN_TO_POS_STATES << LZMA_NUM_POS_SLOT_BITS))
+#define LZMA_ALIGN (LZMA_SPEC_POS \
+		    + LZMA_NUM_FULL_DISTANCES - LZMA_END_POS_MODEL_INDEX)
+#define LZMA_LEN_CODER (LZMA_ALIGN + (1 << LZMA_NUM_ALIGN_BITS))
+#define LZMA_REP_LEN_CODER (LZMA_LEN_CODER + LZMA_NUM_LEN_PROBS)
+#define LZMA_LITERAL (LZMA_REP_LEN_CODER + LZMA_NUM_LEN_PROBS)
+
+#endif