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-rw-r--r--target/linux/generic-2.6/patches-2.6.30/052-pcomp_lzma_support.patch821
1 files changed, 821 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/patches-2.6.30/052-pcomp_lzma_support.patch b/target/linux/generic-2.6/patches-2.6.30/052-pcomp_lzma_support.patch
new file mode 100644
index 0000000000..c5265e9b29
--- /dev/null
+++ b/target/linux/generic-2.6/patches-2.6.30/052-pcomp_lzma_support.patch
@@ -0,0 +1,821 @@
+--- /dev/null
++++ b/crypto/unlzma.c
+@@ -0,0 +1,710 @@
++/*
++ * 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.
++ *
++ * FIXME: the current implementation assumes that the caller will
++ * not free any output buffers until the whole decompression has been
++ * completed. This is necessary, because LZMA looks back at old output
++ * instead of doing a separate dictionary allocation, which saves RAM.
++ */
++
++#include <linux/init.h>
++#include <linux/module.h>
++#include <linux/vmalloc.h>
++#include <linux/interrupt.h>
++#include <linux/mm.h>
++#include <linux/net.h>
++#include <linux/slab.h>
++#include <linux/kthread.h>
++
++#include <crypto/internal/compress.h>
++#include "unlzma.h"
++
++static int instance = 0;
++
++struct unlzma_buffer {
++ struct unlzma_buffer *last;
++ int offset;
++ int size;
++ u8 *ptr;
++};
++
++struct unlzma_ctx {
++ struct task_struct *thread;
++ wait_queue_head_t next_req;
++ struct mutex mutex;
++ bool active;
++ bool cancel;
++
++ const u8 *next_in;
++ int avail_in;
++
++ u8 *next_out;
++ int avail_out;
++
++ /* reader state */
++ u32 code;
++ u32 range;
++ u32 bound;
++
++ /* writer state */
++ u8 previous_byte;
++ ssize_t pos;
++ struct unlzma_buffer *head;
++
++ /* cstate */
++ int state;
++ u32 rep0, rep1, rep2, rep3;
++
++ u32 dict_size;
++
++ void *workspace;
++ int workspace_size;
++};
++
++static inline bool
++unlzma_should_stop(struct unlzma_ctx *ctx)
++{
++ return unlikely(kthread_should_stop() || ctx->cancel);
++}
++
++static void
++unlzma_request_buffer(struct unlzma_ctx *ctx, int *avail)
++{
++ mutex_unlock(&ctx->mutex);
++ wait_event(ctx->next_req, unlzma_should_stop(ctx) || (*avail > 0));
++ mutex_lock(&ctx->mutex);
++}
++
++static u8
++rc_read(struct unlzma_ctx *ctx)
++{
++ if (unlikely(ctx->avail_in <= 0))
++ unlzma_request_buffer(ctx, &ctx->avail_in);
++
++ if (unlzma_should_stop(ctx))
++ return 0;
++
++ ctx->avail_in--;
++ return *(ctx->next_in++);
++}
++
++
++static inline void
++rc_get_code(struct unlzma_ctx *ctx)
++{
++ ctx->code = (ctx->code << 8) | rc_read(ctx);
++}
++
++static void
++rc_normalize(struct unlzma_ctx *ctx)
++{
++ if (ctx->range < (1 << RC_TOP_BITS)) {
++ ctx->range <<= 8;
++ rc_get_code(ctx);
++ }
++}
++
++static int
++rc_is_bit_0(struct unlzma_ctx *ctx, u16 *p)
++{
++ rc_normalize(ctx);
++ ctx->bound = *p * (ctx->range >> RC_MODEL_TOTAL_BITS);
++ return ctx->code < ctx->bound;
++}
++
++static void
++rc_update_bit_0(struct unlzma_ctx *ctx, u16 *p)
++{
++ ctx->range = ctx->bound;
++ *p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS;
++}
++
++static void
++rc_update_bit_1(struct unlzma_ctx *ctx, u16 *p)
++{
++ ctx->range -= ctx->bound;
++ ctx->code -= ctx->bound;
++ *p -= *p >> RC_MOVE_BITS;
++}
++
++static bool
++rc_get_bit(struct unlzma_ctx *ctx, u16 *p, int *symbol)
++{
++ if (rc_is_bit_0(ctx, p)) {
++ rc_update_bit_0(ctx, p);
++ *symbol *= 2;
++ return 0;
++ } else {
++ rc_update_bit_1(ctx, p);
++ *symbol = *symbol * 2 + 1;
++ return 1;
++ }
++}
++
++static int
++rc_direct_bit(struct unlzma_ctx *ctx)
++{
++ rc_normalize(ctx);
++ ctx->range >>= 1;
++ if (ctx->code >= ctx->range) {
++ ctx->code -= ctx->range;
++ return 1;
++ }
++ return 0;
++}
++
++static void
++rc_bit_tree_decode(struct unlzma_ctx *ctx, u16 *p, int num_levels, int *symbol)
++{
++ int i = num_levels;
++
++ *symbol = 1;
++ while (i--)
++ rc_get_bit(ctx, p + *symbol, symbol);
++ *symbol -= 1 << num_levels;
++}
++
++static u8
++peek_old_byte(struct unlzma_ctx *ctx, u32 offs)
++{
++ struct unlzma_buffer *bh = ctx->head;
++ u32 pos;
++
++ pos = ctx->pos - offs;
++ if (pos >= ctx->dict_size) {
++ pos = (~pos % ctx->dict_size);
++ }
++
++ while (bh->offset > pos) {
++ bh = bh->last;
++ if (!bh)
++ return 0;
++ }
++
++ pos -= bh->offset;
++ if (pos > bh->size)
++ return 0;
++
++ return bh->ptr[pos];
++}
++
++static void
++get_buffer(struct unlzma_ctx *ctx)
++{
++ struct unlzma_buffer *bh;
++
++ bh = kzalloc(sizeof(struct unlzma_buffer), GFP_KERNEL);
++ bh->ptr = ctx->next_out;
++ bh->offset = ctx->pos;
++ bh->last = ctx->head;
++ bh->size = ctx->avail_out;
++ ctx->head = bh;
++}
++
++static void
++write_byte(struct unlzma_ctx *ctx, u8 byte)
++{
++ if (unlikely(ctx->avail_out <= 0)) {
++ unlzma_request_buffer(ctx, &ctx->avail_out);
++ get_buffer(ctx);
++ }
++
++ if (!ctx->avail_out)
++ return;
++
++ ctx->previous_byte = byte;
++ *(ctx->next_out++) = byte;
++ ctx->avail_out--;
++ ctx->pos++;
++}
++
++
++static inline void
++copy_byte(struct unlzma_ctx *ctx, u32 offs)
++{
++ write_byte(ctx, peek_old_byte(ctx, offs));
++}
++
++static void
++copy_bytes(struct unlzma_ctx *ctx, u32 rep0, int len)
++{
++ do {
++ copy_byte(ctx, rep0);
++ len--;
++ if (unlzma_should_stop(ctx))
++ break;
++ } while (len != 0);
++}
++
++static void
++process_bit0(struct unlzma_ctx *ctx, u16 *p, int pos_state, u16 *prob,
++ int lc, u32 literal_pos_mask)
++{
++ int mi = 1;
++ rc_update_bit_0(ctx, 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, 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(ctx, prob_lit, &mi) != !!bit)
++ break;
++ } while (mi < 0x100);
++ }
++ while (mi < 0x100) {
++ u16 *prob_lit = prob + mi;
++ rc_get_bit(ctx, prob_lit, &mi);
++ }
++ write_byte(ctx, mi);
++ if (ctx->state < 4)
++ ctx->state = 0;
++ else if (ctx->state < 10)
++ ctx->state -= 3;
++ else
++ ctx->state -= 6;
++}
++
++static void
++process_bit1(struct unlzma_ctx *ctx, u16 *p, int pos_state, u16 *prob)
++{
++ int offset;
++ u16 *prob_len;
++ int num_bits;
++ int len;
++
++ rc_update_bit_1(ctx, prob);
++ prob = p + LZMA_IS_REP + ctx->state;
++ if (rc_is_bit_0(ctx, prob)) {
++ rc_update_bit_0(ctx, 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(ctx, prob);
++ prob = p + LZMA_IS_REP_G0 + ctx->state;
++ if (rc_is_bit_0(ctx, prob)) {
++ rc_update_bit_0(ctx, prob);
++ prob = (p + LZMA_IS_REP_0_LONG
++ + (ctx->state <<
++ LZMA_NUM_POS_BITS_MAX) +
++ pos_state);
++ if (rc_is_bit_0(ctx, prob)) {
++ rc_update_bit_0(ctx, prob);
++
++ ctx->state = ctx->state < LZMA_NUM_LIT_STATES ?
++ 9 : 11;
++ copy_byte(ctx, ctx->rep0);
++ return;
++ } else {
++ rc_update_bit_1(ctx, prob);
++ }
++ } else {
++ u32 distance;
++
++ rc_update_bit_1(ctx, prob);
++ prob = p + LZMA_IS_REP_G1 + ctx->state;
++ if (rc_is_bit_0(ctx, prob)) {
++ rc_update_bit_0(ctx, prob);
++ distance = ctx->rep1;
++ } else {
++ rc_update_bit_1(ctx, prob);
++ prob = p + LZMA_IS_REP_G2 + ctx->state;
++ if (rc_is_bit_0(ctx, prob)) {
++ rc_update_bit_0(ctx, prob);
++ distance = ctx->rep2;
++ } else {
++ rc_update_bit_1(ctx, 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(ctx, prob_len)) {
++ rc_update_bit_0(ctx, 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(ctx, prob_len);
++ prob_len = prob + LZMA_LEN_CHOICE_2;
++ if (rc_is_bit_0(ctx, prob_len)) {
++ rc_update_bit_0(ctx, 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(ctx, 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(ctx, 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(ctx, 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(ctx);
++ 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(ctx, 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, ctx->rep0, len);
++}
++
++
++static int
++do_unlzma(struct unlzma_ctx *ctx)
++{
++ 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);
++ }
++
++ ctx->pos = 0;
++ get_buffer(ctx);
++ ctx->active = true;
++ ctx->state = 0;
++ ctx->rep0 = ctx->rep1 = ctx->rep2 = ctx->rep3 = 1;
++
++ ctx->previous_byte = 0;
++ ctx->code = 0;
++ ctx->range = 0xFFFFFFFF;
++
++ ctx->dict_size = le32_to_cpu(header->dict_size);
++
++ 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;
++
++ if (ctx->dict_size == 0)
++ ctx->dict_size = 1;
++
++ num_probs = LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp));
++ if (ctx->workspace_size < num_probs * sizeof(*p)) {
++ if (ctx->workspace)
++ vfree(ctx->workspace);
++ ctx->workspace = vmalloc(num_probs * sizeof(*p));
++ }
++ 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(ctx);
++
++ 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(ctx, prob))
++ process_bit0(ctx, p, pos_state, prob,
++ lc, literal_pos_mask);
++ else {
++ process_bit1(ctx, p, pos_state, prob);
++ if (ctx->rep0 == 0)
++ break;
++ }
++ if (unlzma_should_stop(ctx))
++ break;
++ }
++
++ return ctx->pos;
++}
++
++
++static void
++unlzma_reset_buf(struct unlzma_ctx *ctx)
++{
++ ctx->avail_in = 0;
++ ctx->next_in = NULL;
++ ctx->avail_out = 0;
++ ctx->next_out = NULL;
++}
++
++static int
++unlzma_thread(void *data)
++{
++ struct unlzma_ctx *ctx = data;
++
++ mutex_lock(&ctx->mutex);
++ do {
++ if (do_unlzma(ctx) < 0)
++ ctx->pos = 0;
++ unlzma_reset_buf(ctx);
++ ctx->cancel = false;
++ ctx->active = false;
++ while (ctx->head) {
++ struct unlzma_buffer *bh = ctx->head;
++ ctx->head = bh->last;
++ kfree(bh);
++ }
++ } while (!kthread_should_stop());
++ mutex_unlock(&ctx->mutex);
++ return 0;
++}
++
++
++static int
++unlzma_init(struct crypto_tfm *tfm)
++{
++ return 0;
++}
++
++static void
++unlzma_cancel(struct unlzma_ctx *ctx)
++{
++ unlzma_reset_buf(ctx);
++
++ if (!ctx->active)
++ return;
++
++ ctx->cancel = true;
++ do {
++ mutex_unlock(&ctx->mutex);
++ wake_up(&ctx->next_req);
++ schedule();
++ mutex_lock(&ctx->mutex);
++ } while (ctx->cancel);
++}
++
++
++static void
++unlzma_exit(struct crypto_tfm *tfm)
++{
++ struct unlzma_ctx *ctx = crypto_tfm_ctx(tfm);
++
++ if (ctx->thread) {
++ unlzma_cancel(ctx);
++ kthread_stop(ctx->thread);
++ ctx->thread = NULL;
++ }
++}
++
++static int
++unlzma_decompress_setup(struct crypto_pcomp *tfm, void *p, unsigned int len)
++{
++ struct unlzma_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
++ int ret = 0;
++
++ if (ctx->thread)
++ return 0;
++
++ mutex_init(&ctx->mutex);
++ init_waitqueue_head(&ctx->next_req);
++ ctx->thread = kthread_run(unlzma_thread, ctx, "unlzma/%d", instance++);
++ if (IS_ERR(ctx->thread)) {
++ ret = PTR_ERR(ctx->thread);
++ ctx->thread = NULL;
++ }
++
++ return ret;
++}
++
++static int
++unlzma_decompress_init(struct crypto_pcomp *tfm)
++{
++ struct unlzma_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
++
++ ctx->pos = 0;
++ return 0;
++}
++
++static void
++unlzma_wait_complete(struct unlzma_ctx *ctx, bool finish)
++{
++ do {
++ mutex_unlock(&ctx->mutex);
++ wake_up(&ctx->next_req);
++ schedule();
++ mutex_lock(&ctx->mutex);
++ } while (ctx->active && (ctx->avail_in > 0) && (ctx->avail_out > 0));
++}
++
++static int
++unlzma_decompress_update(struct crypto_pcomp *tfm, struct comp_request *req)
++{
++ struct unlzma_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
++ size_t pos = 0;
++
++ mutex_lock(&ctx->mutex);
++ if (!ctx->active && !req->avail_in)
++ goto out;
++
++ pos = ctx->pos;
++ ctx->next_in = req->next_in;
++ ctx->avail_in = req->avail_in;
++ ctx->next_out = req->next_out;
++ ctx->avail_out = req->avail_out;
++
++ unlzma_wait_complete(ctx, false);
++
++ req->next_in = ctx->next_in;
++ req->avail_in = ctx->avail_in;
++ req->next_out = ctx->next_out;
++ req->avail_out = ctx->avail_out;
++ pos = ctx->pos - pos;
++
++out:
++ mutex_unlock(&ctx->mutex);
++ return pos;
++}
++
++static int
++unlzma_decompress_final(struct crypto_pcomp *tfm, struct comp_request *req)
++{
++ struct unlzma_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
++ int ret = 0;
++
++ /* cancel pending operation */
++ mutex_lock(&ctx->mutex);
++ if (ctx->active) {
++ // ret = -EINVAL;
++ unlzma_cancel(ctx);
++ }
++ ctx->pos = 0;
++ mutex_unlock(&ctx->mutex);
++ return ret;
++}
++
++
++static struct pcomp_alg unlzma_alg = {
++ .decompress_setup = unlzma_decompress_setup,
++ .decompress_init = unlzma_decompress_init,
++ .decompress_update = unlzma_decompress_update,
++ .decompress_final = unlzma_decompress_final,
++
++ .base = {
++ .cra_name = "lzma",
++ .cra_flags = CRYPTO_ALG_TYPE_PCOMPRESS,
++ .cra_ctxsize = sizeof(struct unlzma_ctx),
++ .cra_module = THIS_MODULE,
++ .cra_init = unlzma_init,
++ .cra_exit = unlzma_exit,
++ }
++};
++
++static int __init
++unlzma_mod_init(void)
++{
++ return crypto_register_pcomp(&unlzma_alg);
++}
++
++static void __exit
++unlzma_mod_exit(void)
++{
++ crypto_unregister_pcomp(&unlzma_alg);
++}
++
++module_init(unlzma_mod_init);
++module_exit(unlzma_mod_exit);
++
++MODULE_LICENSE("GPL");
++MODULE_DESCRIPTION("LZMA Decompression Algorithm");
++MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
+--- a/crypto/Kconfig
++++ b/crypto/Kconfig
+@@ -728,6 +728,12 @@ config CRYPTO_ZLIB
+ help
+ This is the zlib algorithm.
+
++config CRYPTO_UNLZMA
++ tristate "LZMA decompression"
++ select CRYPTO_PCOMP
++ help
++ This is the lzma decompression module.
++
+ config CRYPTO_LZO
+ tristate "LZO compression algorithm"
+ select CRYPTO_ALGAPI
+--- a/crypto/Makefile
++++ b/crypto/Makefile
+@@ -73,6 +73,7 @@ obj-$(CONFIG_CRYPTO_SEED) += seed.o
+ obj-$(CONFIG_CRYPTO_SALSA20) += salsa20_generic.o
+ obj-$(CONFIG_CRYPTO_DEFLATE) += deflate.o
+ obj-$(CONFIG_CRYPTO_ZLIB) += zlib.o
++obj-$(CONFIG_CRYPTO_UNLZMA) += unlzma.o
+ obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += michael_mic.o
+ obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o
+ obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o
+--- /dev/null
++++ b/crypto/unlzma.h
+@@ -0,0 +1,80 @@
++/* 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;
++} __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
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