[PATCH 15/17] lib: Completely purge now-unused lzma code from the kernel
From: Adam Borowski
Date: Fri Nov 09 2018 - 14:03:46 EST
The XZ library already can decompress lzma, this other copy was redundant.
We just removed rather than converted all old users.
Signed-off-by: Adam Borowski <kilobyte@xxxxxxxxxx>
---
include/linux/decompress/unlzma.h | 13 -
lib/Makefile | 1 -
lib/decompress.c | 5 -
lib/decompress_unlzma.c | 679 ------------------------------
4 files changed, 698 deletions(-)
delete mode 100644 include/linux/decompress/unlzma.h
delete mode 100644 lib/decompress_unlzma.c
diff --git a/include/linux/decompress/unlzma.h b/include/linux/decompress/unlzma.h
deleted file mode 100644
index 1c930f125182..000000000000
--- a/include/linux/decompress/unlzma.h
+++ /dev/null
@@ -1,13 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef DECOMPRESS_UNLZMA_H
-#define DECOMPRESS_UNLZMA_H
-
-int unlzma(unsigned char *, long,
- long (*fill)(void*, unsigned long),
- long (*flush)(void*, unsigned long),
- unsigned char *output,
- long *posp,
- void(*error)(char *x)
- );
-
-#endif
diff --git a/lib/Makefile b/lib/Makefile
index 4c1905e6d3a7..0036af71f4a8 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -134,7 +134,6 @@ obj-$(CONFIG_XZ_DEC) += xz/
obj-$(CONFIG_RAID6_PQ) += raid6/
lib-$(CONFIG_DECOMPRESS_GZIP) += decompress_inflate.o
-lib-$(CONFIG_DECOMPRESS_LZMA) += decompress_unlzma.o
lib-$(CONFIG_DECOMPRESS_XZ) += decompress_unxz.o
lib-$(CONFIG_DECOMPRESS_LZO) += decompress_unlzo.o
lib-$(CONFIG_DECOMPRESS_LZ4) += decompress_unlz4.o
diff --git a/lib/decompress.c b/lib/decompress.c
index 60f05122b9da..95f39a14eb7b 100644
--- a/lib/decompress.c
+++ b/lib/decompress.c
@@ -8,7 +8,6 @@
#include <linux/decompress/generic.h>
#include <linux/decompress/bunzip2.h>
-#include <linux/decompress/unlzma.h>
#include <linux/decompress/unxz.h>
#include <linux/decompress/inflate.h>
#include <linux/decompress/unlzo.h>
@@ -23,9 +22,6 @@
#ifndef CONFIG_DECOMPRESS_GZIP
# define gunzip NULL
#endif
-#ifndef CONFIG_DECOMPRESS_LZMA
-# define unlzma NULL
-#endif
#ifndef CONFIG_DECOMPRESS_XZ
# define unxz NULL
#endif
@@ -48,7 +44,6 @@ struct compress_format {
static const struct compress_format compressed_formats[] __initconst = {
{ {0x1f, 0x8b}, "gzip", gunzip },
{ {0x1f, 0x9e}, "gzip", gunzip },
- { {0x5d, 0x00}, "lzma", unlzma },
{ {0xfd, 0x37}, "xz", unxz },
{ {0x89, 0x4c}, "lzo", unlzo },
{ {0x02, 0x21}, "lz4", unlz4 },
diff --git a/lib/decompress_unlzma.c b/lib/decompress_unlzma.c
deleted file mode 100644
index ed7a1fd819f2..000000000000
--- a/lib/decompress_unlzma.c
+++ /dev/null
@@ -1,679 +0,0 @@
-/* Lzma decompressor for Linux kernel. Shamelessly snarfed
- *from busybox 1.1.1
- *
- *Linux kernel adaptation
- *Copyright (C) 2006 Alain < alain@xxxxxxxx >
- *
- *Based on small lzma deflate implementation/Small range coder
- *implementation for lzma.
- *Copyright (C) 2006 Aurelien Jacobs < aurel@xxxxxxxxxx >
- *
- *Based on LzmaDecode.c from the LZMA SDK 4.22 (http://www.7-zip.org/)
- *Copyright (C) 1999-2005 Igor Pavlov
- *
- *Copyrights of the parts, see headers below.
- *
- *
- *This program is free software; you can redistribute it and/or
- *modify it under the terms of the GNU Lesser General Public
- *License as published by the Free Software Foundation; either
- *version 2.1 of the License, 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
- *Lesser General Public License for more details.
- *
- *You should have received a copy of the GNU Lesser General Public
- *License along with this library; if not, write to the Free Software
- *Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifdef STATIC
-#define PREBOOT
-#else
-#include <linux/decompress/unlzma.h>
-#endif /* STATIC */
-
-#include <linux/decompress/mm.h>
-
-#define MIN(a, b) (((a) < (b)) ? (a) : (b))
-
-static long long INIT read_int(unsigned char *ptr, int size)
-{
- int i;
- long long ret = 0;
-
- for (i = 0; i < size; i++)
- ret = (ret << 8) | ptr[size-i-1];
- return ret;
-}
-
-#define ENDIAN_CONVERT(x) \
- x = (typeof(x))read_int((unsigned char *)&x, sizeof(x))
-
-
-/* Small range coder implementation for lzma.
- *Copyright (C) 2006 Aurelien Jacobs < aurel@xxxxxxxxxx >
- *
- *Based on LzmaDecode.c from the LZMA SDK 4.22 (http://www.7-zip.org/)
- *Copyright (c) 1999-2005 Igor Pavlov
- */
-
-#include <linux/compiler.h>
-
-#define LZMA_IOBUF_SIZE 0x10000
-
-struct rc {
- long (*fill)(void*, unsigned long);
- uint8_t *ptr;
- uint8_t *buffer;
- uint8_t *buffer_end;
- long buffer_size;
- uint32_t code;
- uint32_t range;
- uint32_t bound;
- void (*error)(char *);
-};
-
-
-#define RC_TOP_BITS 24
-#define RC_MOVE_BITS 5
-#define RC_MODEL_TOTAL_BITS 11
-
-
-static long INIT nofill(void *buffer, unsigned long len)
-{
- return -1;
-}
-
-/* Called twice: once at startup and once in rc_normalize() */
-static void INIT rc_read(struct rc *rc)
-{
- rc->buffer_size = rc->fill((char *)rc->buffer, LZMA_IOBUF_SIZE);
- if (rc->buffer_size <= 0)
- rc->error("unexpected EOF");
- rc->ptr = rc->buffer;
- rc->buffer_end = rc->buffer + rc->buffer_size;
-}
-
-/* Called once */
-static inline void INIT rc_init(struct rc *rc,
- long (*fill)(void*, unsigned long),
- char *buffer, long buffer_size)
-{
- if (fill)
- rc->fill = fill;
- else
- rc->fill = nofill;
- rc->buffer = (uint8_t *)buffer;
- rc->buffer_size = buffer_size;
- rc->buffer_end = rc->buffer + rc->buffer_size;
- rc->ptr = rc->buffer;
-
- rc->code = 0;
- rc->range = 0xFFFFFFFF;
-}
-
-static inline void INIT rc_init_code(struct rc *rc)
-{
- int i;
-
- for (i = 0; i < 5; i++) {
- if (rc->ptr >= rc->buffer_end)
- rc_read(rc);
- rc->code = (rc->code << 8) | *rc->ptr++;
- }
-}
-
-
-/* Called twice, but one callsite is in inline'd rc_is_bit_0_helper() */
-static void INIT rc_do_normalize(struct rc *rc)
-{
- if (rc->ptr >= rc->buffer_end)
- rc_read(rc);
- rc->range <<= 8;
- rc->code = (rc->code << 8) | *rc->ptr++;
-}
-static inline void INIT rc_normalize(struct rc *rc)
-{
- if (rc->range < (1 << RC_TOP_BITS))
- rc_do_normalize(rc);
-}
-
-/* Called 9 times */
-/* Why rc_is_bit_0_helper exists?
- *Because we want to always expose (rc->code < rc->bound) to optimizer
- */
-static inline uint32_t INIT rc_is_bit_0_helper(struct rc *rc, uint16_t *p)
-{
- rc_normalize(rc);
- rc->bound = *p * (rc->range >> RC_MODEL_TOTAL_BITS);
- return rc->bound;
-}
-static inline int INIT rc_is_bit_0(struct rc *rc, uint16_t *p)
-{
- uint32_t t = rc_is_bit_0_helper(rc, p);
- return rc->code < t;
-}
-
-/* Called ~10 times, but very small, thus inlined */
-static inline void INIT rc_update_bit_0(struct rc *rc, uint16_t *p)
-{
- rc->range = rc->bound;
- *p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS;
-}
-static inline void INIT rc_update_bit_1(struct rc *rc, uint16_t *p)
-{
- rc->range -= rc->bound;
- rc->code -= rc->bound;
- *p -= *p >> RC_MOVE_BITS;
-}
-
-/* Called 4 times in unlzma loop */
-static int INIT rc_get_bit(struct rc *rc, uint16_t *p, int *symbol)
-{
- if (rc_is_bit_0(rc, p)) {
- rc_update_bit_0(rc, p);
- *symbol *= 2;
- return 0;
- } else {
- rc_update_bit_1(rc, p);
- *symbol = *symbol * 2 + 1;
- return 1;
- }
-}
-
-/* Called once */
-static inline int INIT rc_direct_bit(struct rc *rc)
-{
- rc_normalize(rc);
- rc->range >>= 1;
- if (rc->code >= rc->range) {
- rc->code -= rc->range;
- return 1;
- }
- return 0;
-}
-
-/* Called twice */
-static inline void INIT
-rc_bit_tree_decode(struct rc *rc, uint16_t *p, int num_levels, int *symbol)
-{
- int i = num_levels;
-
- *symbol = 1;
- while (i--)
- rc_get_bit(rc, p + *symbol, symbol);
- *symbol -= 1 << num_levels;
-}
-
-
-/*
- * Small lzma deflate implementation.
- * Copyright (C) 2006 Aurelien Jacobs < aurel@xxxxxxxxxx >
- *
- * Based on LzmaDecode.c from the LZMA SDK 4.22 (http://www.7-zip.org/)
- * Copyright (C) 1999-2005 Igor Pavlov
- */
-
-
-struct lzma_header {
- uint8_t pos;
- uint32_t dict_size;
- uint64_t dst_size;
-} __attribute__ ((packed)) ;
-
-
-#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)
-
-
-struct writer {
- uint8_t *buffer;
- uint8_t previous_byte;
- size_t buffer_pos;
- int bufsize;
- size_t global_pos;
- long (*flush)(void*, unsigned long);
- struct lzma_header *header;
-};
-
-struct cstate {
- int state;
- uint32_t rep0, rep1, rep2, rep3;
-};
-
-static inline size_t INIT get_pos(struct writer *wr)
-{
- return
- wr->global_pos + wr->buffer_pos;
-}
-
-static inline uint8_t INIT peek_old_byte(struct writer *wr,
- uint32_t offs)
-{
- if (!wr->flush) {
- int32_t pos;
- while (offs > wr->header->dict_size)
- offs -= wr->header->dict_size;
- pos = wr->buffer_pos - offs;
- return wr->buffer[pos];
- } else {
- uint32_t pos = wr->buffer_pos - offs;
- while (pos >= wr->header->dict_size)
- pos += wr->header->dict_size;
- return wr->buffer[pos];
- }
-
-}
-
-static inline int INIT write_byte(struct writer *wr, uint8_t byte)
-{
- wr->buffer[wr->buffer_pos++] = wr->previous_byte = byte;
- if (wr->flush && wr->buffer_pos == wr->header->dict_size) {
- wr->buffer_pos = 0;
- wr->global_pos += wr->header->dict_size;
- if (wr->flush((char *)wr->buffer, wr->header->dict_size)
- != wr->header->dict_size)
- return -1;
- }
- return 0;
-}
-
-
-static inline int INIT copy_byte(struct writer *wr, uint32_t offs)
-{
- return write_byte(wr, peek_old_byte(wr, offs));
-}
-
-static inline int INIT copy_bytes(struct writer *wr,
- uint32_t rep0, int len)
-{
- do {
- if (copy_byte(wr, rep0))
- return -1;
- len--;
- } while (len != 0 && wr->buffer_pos < wr->header->dst_size);
-
- return len;
-}
-
-static inline int INIT process_bit0(struct writer *wr, struct rc *rc,
- struct cstate *cst, uint16_t *p,
- int pos_state, uint16_t *prob,
- int lc, uint32_t literal_pos_mask) {
- int mi = 1;
- rc_update_bit_0(rc, prob);
- prob = (p + LZMA_LITERAL +
- (LZMA_LIT_SIZE
- * (((get_pos(wr) & literal_pos_mask) << lc)
- + (wr->previous_byte >> (8 - lc))))
- );
-
- if (cst->state >= LZMA_NUM_LIT_STATES) {
- int match_byte = peek_old_byte(wr, cst->rep0);
- do {
- int bit;
- uint16_t *prob_lit;
-
- match_byte <<= 1;
- bit = match_byte & 0x100;
- prob_lit = prob + 0x100 + bit + mi;
- if (rc_get_bit(rc, prob_lit, &mi)) {
- if (!bit)
- break;
- } else {
- if (bit)
- break;
- }
- } while (mi < 0x100);
- }
- while (mi < 0x100) {
- uint16_t *prob_lit = prob + mi;
- rc_get_bit(rc, prob_lit, &mi);
- }
- if (cst->state < 4)
- cst->state = 0;
- else if (cst->state < 10)
- cst->state -= 3;
- else
- cst->state -= 6;
-
- return write_byte(wr, mi);
-}
-
-static inline int INIT process_bit1(struct writer *wr, struct rc *rc,
- struct cstate *cst, uint16_t *p,
- int pos_state, uint16_t *prob) {
- int offset;
- uint16_t *prob_len;
- int num_bits;
- int len;
-
- rc_update_bit_1(rc, prob);
- prob = p + LZMA_IS_REP + cst->state;
- if (rc_is_bit_0(rc, prob)) {
- rc_update_bit_0(rc, prob);
- cst->rep3 = cst->rep2;
- cst->rep2 = cst->rep1;
- cst->rep1 = cst->rep0;
- cst->state = cst->state < LZMA_NUM_LIT_STATES ? 0 : 3;
- prob = p + LZMA_LEN_CODER;
- } else {
- rc_update_bit_1(rc, prob);
- prob = p + LZMA_IS_REP_G0 + cst->state;
- if (rc_is_bit_0(rc, prob)) {
- rc_update_bit_0(rc, prob);
- prob = (p + LZMA_IS_REP_0_LONG
- + (cst->state <<
- LZMA_NUM_POS_BITS_MAX) +
- pos_state);
- if (rc_is_bit_0(rc, prob)) {
- rc_update_bit_0(rc, prob);
-
- cst->state = cst->state < LZMA_NUM_LIT_STATES ?
- 9 : 11;
- return copy_byte(wr, cst->rep0);
- } else {
- rc_update_bit_1(rc, prob);
- }
- } else {
- uint32_t distance;
-
- rc_update_bit_1(rc, prob);
- prob = p + LZMA_IS_REP_G1 + cst->state;
- if (rc_is_bit_0(rc, prob)) {
- rc_update_bit_0(rc, prob);
- distance = cst->rep1;
- } else {
- rc_update_bit_1(rc, prob);
- prob = p + LZMA_IS_REP_G2 + cst->state;
- if (rc_is_bit_0(rc, prob)) {
- rc_update_bit_0(rc, prob);
- distance = cst->rep2;
- } else {
- rc_update_bit_1(rc, prob);
- distance = cst->rep3;
- cst->rep3 = cst->rep2;
- }
- cst->rep2 = cst->rep1;
- }
- cst->rep1 = cst->rep0;
- cst->rep0 = distance;
- }
- cst->state = cst->state < LZMA_NUM_LIT_STATES ? 8 : 11;
- prob = p + LZMA_REP_LEN_CODER;
- }
-
- prob_len = prob + LZMA_LEN_CHOICE;
- if (rc_is_bit_0(rc, prob_len)) {
- rc_update_bit_0(rc, 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(rc, prob_len);
- prob_len = prob + LZMA_LEN_CHOICE_2;
- if (rc_is_bit_0(rc, prob_len)) {
- rc_update_bit_0(rc, 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(rc, 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(rc, prob_len, num_bits, &len);
- len += offset;
-
- if (cst->state < 4) {
- int pos_slot;
-
- cst->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(rc, 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;
- cst->rep0 = 2 | (pos_slot & 1);
- if (pos_slot < LZMA_END_POS_MODEL_INDEX) {
- cst->rep0 <<= num_bits;
- prob = p + LZMA_SPEC_POS +
- cst->rep0 - pos_slot - 1;
- } else {
- num_bits -= LZMA_NUM_ALIGN_BITS;
- while (num_bits--)
- cst->rep0 = (cst->rep0 << 1) |
- rc_direct_bit(rc);
- prob = p + LZMA_ALIGN;
- cst->rep0 <<= LZMA_NUM_ALIGN_BITS;
- num_bits = LZMA_NUM_ALIGN_BITS;
- }
- i = 1;
- mi = 1;
- while (num_bits--) {
- if (rc_get_bit(rc, prob + mi, &mi))
- cst->rep0 |= i;
- i <<= 1;
- }
- } else
- cst->rep0 = pos_slot;
- if (++(cst->rep0) == 0)
- return 0;
- if (cst->rep0 > wr->header->dict_size
- || cst->rep0 > get_pos(wr))
- return -1;
- }
-
- len += LZMA_MATCH_MIN_LEN;
-
- return copy_bytes(wr, cst->rep0, len);
-}
-
-
-
-STATIC inline int INIT unlzma(unsigned char *buf, long in_len,
- long (*fill)(void*, unsigned long),
- long (*flush)(void*, unsigned long),
- unsigned char *output,
- long *posp,
- void(*error)(char *x)
- )
-{
- struct lzma_header header;
- int lc, pb, lp;
- uint32_t pos_state_mask;
- uint32_t literal_pos_mask;
- uint16_t *p;
- int num_probs;
- struct rc rc;
- int i, mi;
- struct writer wr;
- struct cstate cst;
- unsigned char *inbuf;
- int ret = -1;
-
- rc.error = error;
-
- if (buf)
- inbuf = buf;
- else
- inbuf = malloc(LZMA_IOBUF_SIZE);
- if (!inbuf) {
- error("Could not allocate input buffer");
- goto exit_0;
- }
-
- cst.state = 0;
- cst.rep0 = cst.rep1 = cst.rep2 = cst.rep3 = 1;
-
- wr.header = &header;
- wr.flush = flush;
- wr.global_pos = 0;
- wr.previous_byte = 0;
- wr.buffer_pos = 0;
-
- rc_init(&rc, fill, inbuf, in_len);
-
- for (i = 0; i < sizeof(header); i++) {
- if (rc.ptr >= rc.buffer_end)
- rc_read(&rc);
- ((unsigned char *)&header)[i] = *rc.ptr++;
- }
-
- if (header.pos >= (9 * 5 * 5)) {
- error("bad header");
- goto exit_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;
-
- ENDIAN_CONVERT(header.dict_size);
- ENDIAN_CONVERT(header.dst_size);
-
- if (header.dict_size == 0)
- header.dict_size = 1;
-
- if (output)
- wr.buffer = output;
- else {
- wr.bufsize = MIN(header.dst_size, header.dict_size);
- wr.buffer = large_malloc(wr.bufsize);
- }
- if (wr.buffer == NULL)
- goto exit_1;
-
- num_probs = LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp));
- p = (uint16_t *) large_malloc(num_probs * sizeof(*p));
- if (p == NULL)
- goto exit_2;
- num_probs = LZMA_LITERAL + (LZMA_LIT_SIZE << (lc + lp));
- for (i = 0; i < num_probs; i++)
- p[i] = (1 << RC_MODEL_TOTAL_BITS) >> 1;
-
- rc_init_code(&rc);
-
- while (get_pos(&wr) < header.dst_size) {
- int pos_state = get_pos(&wr) & pos_state_mask;
- uint16_t *prob = p + LZMA_IS_MATCH +
- (cst.state << LZMA_NUM_POS_BITS_MAX) + pos_state;
- if (rc_is_bit_0(&rc, prob)) {
- if (process_bit0(&wr, &rc, &cst, p, pos_state, prob,
- lc, literal_pos_mask)) {
- error("LZMA data is corrupt");
- goto exit_3;
- }
- } else {
- if (process_bit1(&wr, &rc, &cst, p, pos_state, prob)) {
- error("LZMA data is corrupt");
- goto exit_3;
- }
- if (cst.rep0 == 0)
- break;
- }
- if (rc.buffer_size <= 0)
- goto exit_3;
- }
-
- if (posp)
- *posp = rc.ptr-rc.buffer;
- if (!wr.flush || wr.flush(wr.buffer, wr.buffer_pos) == wr.buffer_pos)
- ret = 0;
-exit_3:
- large_free(p);
-exit_2:
- if (!output)
- large_free(wr.buffer);
-exit_1:
- if (!buf)
- free(inbuf);
-exit_0:
- return ret;
-}
-
-#ifdef PREBOOT
-STATIC int INIT __decompress(unsigned char *buf, long in_len,
- long (*fill)(void*, unsigned long),
- long (*flush)(void*, unsigned long),
- unsigned char *output, long out_len,
- long *posp,
- void (*error)(char *x))
-{
- return unlzma(buf, in_len - 4, fill, flush, output, posp, error);
-}
-#endif
--
2.19.1