mirror of
https://github.com/sheumann/hush.git
synced 2024-09-12 00:55:11 +00:00
Since rangecoder is just a bunch of C functions, move it into the one user
(decompress_unlzma.c). Also a slight #include cleanup, and I've been meaning to put #include <unistd.h> into libbb.h since it's so darn common...
This commit is contained in:
parent
5483de1cb7
commit
b13fee4cbb
@ -1,3 +1,4 @@
|
||||
/* vi:set ts=4: */
|
||||
/*
|
||||
* Small lzma deflate implementation.
|
||||
* Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
|
||||
@ -5,31 +6,154 @@
|
||||
* 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 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
|
||||
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
||||
*/
|
||||
|
||||
#include <stdint.h>
|
||||
#include <unistd.h>
|
||||
#include <stdio.h>
|
||||
#include <byteswap.h>
|
||||
|
||||
#include "libbb.h"
|
||||
|
||||
#include "unarchive.h"
|
||||
|
||||
#include "rangecoder.h"
|
||||
#ifdef CONFIG_FEATURE_LZMA_FAST
|
||||
# define speed_inline ATTRIBUTE_ALWAYS_INLINE
|
||||
#else
|
||||
# define speed_inline
|
||||
#endif
|
||||
|
||||
|
||||
typedef struct {
|
||||
int fd;
|
||||
uint8_t *ptr;
|
||||
uint8_t *buffer;
|
||||
uint8_t *buffer_end;
|
||||
int buffer_size;
|
||||
uint32_t code;
|
||||
uint32_t range;
|
||||
uint32_t bound;
|
||||
} rc_t;
|
||||
|
||||
|
||||
#define RC_TOP_BITS 24
|
||||
#define RC_MOVE_BITS 5
|
||||
#define RC_MODEL_TOTAL_BITS 11
|
||||
|
||||
|
||||
/* Called twice: once at startup and once in rc_normalize() */
|
||||
static void rc_read(rc_t * rc)
|
||||
{
|
||||
rc->buffer_size = read(rc->fd, rc->buffer, rc->buffer_size);
|
||||
if (rc->buffer_size <= 0)
|
||||
bb_error_msg_and_die("unexpected EOF");
|
||||
rc->ptr = rc->buffer;
|
||||
rc->buffer_end = rc->buffer + rc->buffer_size;
|
||||
}
|
||||
|
||||
/* Called once */
|
||||
static void rc_init(rc_t * rc, int fd, int buffer_size)
|
||||
{
|
||||
int i;
|
||||
|
||||
rc->fd = fd;
|
||||
rc->buffer = xmalloc(buffer_size);
|
||||
rc->buffer_size = buffer_size;
|
||||
rc->buffer_end = rc->buffer + rc->buffer_size;
|
||||
rc->ptr = rc->buffer_end;
|
||||
|
||||
rc->code = 0;
|
||||
rc->range = 0xFFFFFFFF;
|
||||
for (i = 0; i < 5; i++) {
|
||||
if (rc->ptr >= rc->buffer_end)
|
||||
rc_read(rc);
|
||||
rc->code = (rc->code << 8) | *rc->ptr++;
|
||||
}
|
||||
}
|
||||
|
||||
/* Called once. TODO: bb_maybe_free() */
|
||||
static ATTRIBUTE_ALWAYS_INLINE void rc_free(rc_t * rc)
|
||||
{
|
||||
if (ENABLE_FEATURE_CLEAN_UP)
|
||||
free(rc->buffer);
|
||||
}
|
||||
|
||||
/* Called twice, but one callsite is in speed_inline'd rc_is_bit_0_helper() */
|
||||
static void rc_do_normalize(rc_t * rc)
|
||||
{
|
||||
if (rc->ptr >= rc->buffer_end)
|
||||
rc_read(rc);
|
||||
rc->range <<= 8;
|
||||
rc->code = (rc->code << 8) | *rc->ptr++;
|
||||
}
|
||||
static ATTRIBUTE_ALWAYS_INLINE void rc_normalize(rc_t * 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 speed_inline uint32_t rc_is_bit_0_helper(rc_t * rc, uint16_t * p)
|
||||
{
|
||||
rc_normalize(rc);
|
||||
rc->bound = *p * (rc->range >> RC_MODEL_TOTAL_BITS);
|
||||
return rc->bound;
|
||||
}
|
||||
static ATTRIBUTE_ALWAYS_INLINE int rc_is_bit_0(rc_t * 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 speed_inline void rc_update_bit_0(rc_t * rc, uint16_t * p)
|
||||
{
|
||||
rc->range = rc->bound;
|
||||
*p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS;
|
||||
}
|
||||
static speed_inline void rc_update_bit_1(rc_t * 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 rc_get_bit(rc_t * 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 ATTRIBUTE_ALWAYS_INLINE int rc_direct_bit(rc_t * rc)
|
||||
{
|
||||
rc_normalize(rc);
|
||||
rc->range >>= 1;
|
||||
if (rc->code >= rc->range) {
|
||||
rc->code -= rc->range;
|
||||
return 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Called twice */
|
||||
static speed_inline void
|
||||
rc_bit_tree_decode(rc_t * 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;
|
||||
}
|
||||
|
||||
|
||||
typedef struct {
|
||||
|
@ -1,147 +0,0 @@
|
||||
|
||||
#include "libbb.h"
|
||||
|
||||
#ifdef CONFIG_FEATURE_LZMA_FAST
|
||||
# define speed_inline ATTRIBUTE_ALWAYS_INLINE
|
||||
#else
|
||||
# define speed_inline
|
||||
#endif
|
||||
|
||||
|
||||
typedef struct {
|
||||
int fd;
|
||||
uint8_t *ptr;
|
||||
uint8_t *buffer;
|
||||
uint8_t *buffer_end;
|
||||
int buffer_size;
|
||||
uint32_t code;
|
||||
uint32_t range;
|
||||
uint32_t bound;
|
||||
} rc_t;
|
||||
|
||||
|
||||
#define RC_TOP_BITS 24
|
||||
#define RC_MOVE_BITS 5
|
||||
#define RC_MODEL_TOTAL_BITS 11
|
||||
|
||||
|
||||
/* Called twice: once at startup and once in rc_normalize() */
|
||||
static void rc_read(rc_t * rc)
|
||||
{
|
||||
rc->buffer_size = read(rc->fd, rc->buffer, rc->buffer_size);
|
||||
if (rc->buffer_size <= 0)
|
||||
bb_error_msg_and_die("unexpected EOF");
|
||||
rc->ptr = rc->buffer;
|
||||
rc->buffer_end = rc->buffer + rc->buffer_size;
|
||||
}
|
||||
|
||||
/* Called once */
|
||||
static void rc_init(rc_t * rc, int fd, int buffer_size)
|
||||
{
|
||||
int i;
|
||||
|
||||
rc->fd = fd;
|
||||
rc->buffer = xmalloc(buffer_size);
|
||||
rc->buffer_size = buffer_size;
|
||||
rc->buffer_end = rc->buffer + rc->buffer_size;
|
||||
rc->ptr = rc->buffer_end;
|
||||
|
||||
rc->code = 0;
|
||||
rc->range = 0xFFFFFFFF;
|
||||
for (i = 0; i < 5; i++) {
|
||||
if (rc->ptr >= rc->buffer_end)
|
||||
rc_read(rc);
|
||||
rc->code = (rc->code << 8) | *rc->ptr++;
|
||||
}
|
||||
}
|
||||
|
||||
/* Called once. TODO: bb_maybe_free() */
|
||||
static ATTRIBUTE_ALWAYS_INLINE void rc_free(rc_t * rc)
|
||||
{
|
||||
if (ENABLE_FEATURE_CLEAN_UP)
|
||||
free(rc->buffer);
|
||||
}
|
||||
|
||||
/* Called twice, but one callsite is in speed_inline'd rc_is_bit_0_helper() */
|
||||
static void rc_do_normalize(rc_t * rc)
|
||||
{
|
||||
if (rc->ptr >= rc->buffer_end)
|
||||
rc_read(rc);
|
||||
rc->range <<= 8;
|
||||
rc->code = (rc->code << 8) | *rc->ptr++;
|
||||
}
|
||||
static ATTRIBUTE_ALWAYS_INLINE void rc_normalize(rc_t * 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 speed_inline uint32_t rc_is_bit_0_helper(rc_t * rc, uint16_t * p)
|
||||
{
|
||||
rc_normalize(rc);
|
||||
rc->bound = *p * (rc->range >> RC_MODEL_TOTAL_BITS);
|
||||
return rc->bound;
|
||||
}
|
||||
static ATTRIBUTE_ALWAYS_INLINE int rc_is_bit_0(rc_t * 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 speed_inline void rc_update_bit_0(rc_t * rc, uint16_t * p)
|
||||
{
|
||||
rc->range = rc->bound;
|
||||
*p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS;
|
||||
}
|
||||
static speed_inline void rc_update_bit_1(rc_t * 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 rc_get_bit(rc_t * 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 ATTRIBUTE_ALWAYS_INLINE int rc_direct_bit(rc_t * rc)
|
||||
{
|
||||
rc_normalize(rc);
|
||||
rc->range >>= 1;
|
||||
if (rc->code >= rc->range) {
|
||||
rc->code -= rc->range;
|
||||
return 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Called twice */
|
||||
static speed_inline void
|
||||
rc_bit_tree_decode(rc_t * 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;
|
||||
}
|
||||
|
||||
/* vi:set ts=4: */
|
@ -24,6 +24,7 @@
|
||||
#include <sys/time.h>
|
||||
#include <sys/types.h>
|
||||
#include <termios.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#ifdef CONFIG_SELINUX
|
||||
#include <selinux/selinux.h>
|
||||
|
Loading…
Reference in New Issue
Block a user