157 lines
4.4 KiB
C
157 lines
4.4 KiB
C
/*
|
|
* Private includes and definitions
|
|
*
|
|
* Author: Lasse Collin <lasse.collin@tukaani.org>
|
|
*
|
|
* This file has been put into the public domain.
|
|
* You can do whatever you want with this file.
|
|
*/
|
|
|
|
#ifndef XZ_PRIVATE_H
|
|
#define XZ_PRIVATE_H
|
|
|
|
#ifdef __KERNEL__
|
|
# include <linux/xz.h>
|
|
# include <asm/byteorder.h>
|
|
# include <asm/unaligned.h>
|
|
/* XZ_PREBOOT may be defined only via decompress_unxz.c. */
|
|
# ifndef XZ_PREBOOT
|
|
# include <linux/slab.h>
|
|
# include <linux/vmalloc.h>
|
|
# include <linux/string.h>
|
|
# ifdef CONFIG_XZ_DEC_X86
|
|
# define XZ_DEC_X86
|
|
# endif
|
|
# ifdef CONFIG_XZ_DEC_POWERPC
|
|
# define XZ_DEC_POWERPC
|
|
# endif
|
|
# ifdef CONFIG_XZ_DEC_IA64
|
|
# define XZ_DEC_IA64
|
|
# endif
|
|
# ifdef CONFIG_XZ_DEC_ARM
|
|
# define XZ_DEC_ARM
|
|
# endif
|
|
# ifdef CONFIG_XZ_DEC_ARMTHUMB
|
|
# define XZ_DEC_ARMTHUMB
|
|
# endif
|
|
# ifdef CONFIG_XZ_DEC_SPARC
|
|
# define XZ_DEC_SPARC
|
|
# endif
|
|
# define memeq(a, b, size) (memcmp(a, b, size) == 0)
|
|
# define memzero(buf, size) memset(buf, 0, size)
|
|
# endif
|
|
# define get_le32(p) le32_to_cpup((const uint32_t *)(p))
|
|
#else
|
|
/*
|
|
* For userspace builds, use a separate header to define the required
|
|
* macros and functions. This makes it easier to adapt the code into
|
|
* different environments and avoids clutter in the Linux kernel tree.
|
|
*/
|
|
# include "xz_config.h"
|
|
#endif
|
|
|
|
/* If no specific decoding mode is requested, enable support for all modes. */
|
|
#if !defined(XZ_DEC_SINGLE) && !defined(XZ_DEC_PREALLOC) \
|
|
&& !defined(XZ_DEC_DYNALLOC)
|
|
# define XZ_DEC_SINGLE
|
|
# define XZ_DEC_PREALLOC
|
|
# define XZ_DEC_DYNALLOC
|
|
#endif
|
|
|
|
/*
|
|
* The DEC_IS_foo(mode) macros are used in "if" statements. If only some
|
|
* of the supported modes are enabled, these macros will evaluate to true or
|
|
* false at compile time and thus allow the compiler to omit unneeded code.
|
|
*/
|
|
#ifdef XZ_DEC_SINGLE
|
|
# define DEC_IS_SINGLE(mode) ((mode) == XZ_SINGLE)
|
|
#else
|
|
# define DEC_IS_SINGLE(mode) (false)
|
|
#endif
|
|
|
|
#ifdef XZ_DEC_PREALLOC
|
|
# define DEC_IS_PREALLOC(mode) ((mode) == XZ_PREALLOC)
|
|
#else
|
|
# define DEC_IS_PREALLOC(mode) (false)
|
|
#endif
|
|
|
|
#ifdef XZ_DEC_DYNALLOC
|
|
# define DEC_IS_DYNALLOC(mode) ((mode) == XZ_DYNALLOC)
|
|
#else
|
|
# define DEC_IS_DYNALLOC(mode) (false)
|
|
#endif
|
|
|
|
#if !defined(XZ_DEC_SINGLE)
|
|
# define DEC_IS_MULTI(mode) (true)
|
|
#elif defined(XZ_DEC_PREALLOC) || defined(XZ_DEC_DYNALLOC)
|
|
# define DEC_IS_MULTI(mode) ((mode) != XZ_SINGLE)
|
|
#else
|
|
# define DEC_IS_MULTI(mode) (false)
|
|
#endif
|
|
|
|
/*
|
|
* If any of the BCJ filter decoders are wanted, define XZ_DEC_BCJ.
|
|
* XZ_DEC_BCJ is used to enable generic support for BCJ decoders.
|
|
*/
|
|
#ifndef XZ_DEC_BCJ
|
|
# if defined(XZ_DEC_X86) || defined(XZ_DEC_POWERPC) \
|
|
|| defined(XZ_DEC_IA64) || defined(XZ_DEC_ARM) \
|
|
|| defined(XZ_DEC_ARM) || defined(XZ_DEC_ARMTHUMB) \
|
|
|| defined(XZ_DEC_SPARC)
|
|
# define XZ_DEC_BCJ
|
|
# endif
|
|
#endif
|
|
|
|
/*
|
|
* Allocate memory for LZMA2 decoder. xz_dec_lzma2_reset() must be used
|
|
* before calling xz_dec_lzma2_run().
|
|
*/
|
|
XZ_EXTERN struct xz_dec_lzma2 *xz_dec_lzma2_create(enum xz_mode mode,
|
|
uint32_t dict_max);
|
|
|
|
/*
|
|
* Decode the LZMA2 properties (one byte) and reset the decoder. Return
|
|
* XZ_OK on success, XZ_MEMLIMIT_ERROR if the preallocated dictionary is not
|
|
* big enough, and XZ_OPTIONS_ERROR if props indicates something that this
|
|
* decoder doesn't support.
|
|
*/
|
|
XZ_EXTERN enum xz_ret xz_dec_lzma2_reset(struct xz_dec_lzma2 *s,
|
|
uint8_t props);
|
|
|
|
/* Decode raw LZMA2 stream from b->in to b->out. */
|
|
XZ_EXTERN enum xz_ret xz_dec_lzma2_run(struct xz_dec_lzma2 *s,
|
|
struct xz_buf *b);
|
|
|
|
/* Free the memory allocated for the LZMA2 decoder. */
|
|
XZ_EXTERN void xz_dec_lzma2_end(struct xz_dec_lzma2 *s);
|
|
|
|
#ifdef XZ_DEC_BCJ
|
|
/*
|
|
* Allocate memory for BCJ decoders. xz_dec_bcj_reset() must be used before
|
|
* calling xz_dec_bcj_run().
|
|
*/
|
|
XZ_EXTERN struct xz_dec_bcj *xz_dec_bcj_create(bool single_call);
|
|
|
|
/*
|
|
* Decode the Filter ID of a BCJ filter. This implementation doesn't
|
|
* support custom start offsets, so no decoding of Filter Properties
|
|
* is needed. Returns XZ_OK if the given Filter ID is supported.
|
|
* Otherwise XZ_OPTIONS_ERROR is returned.
|
|
*/
|
|
XZ_EXTERN enum xz_ret xz_dec_bcj_reset(struct xz_dec_bcj *s, uint8_t id);
|
|
|
|
/*
|
|
* Decode raw BCJ + LZMA2 stream. This must be used only if there actually is
|
|
* a BCJ filter in the chain. If the chain has only LZMA2, xz_dec_lzma2_run()
|
|
* must be called directly.
|
|
*/
|
|
XZ_EXTERN enum xz_ret xz_dec_bcj_run(struct xz_dec_bcj *s,
|
|
struct xz_dec_lzma2 *lzma2,
|
|
struct xz_buf *b);
|
|
|
|
/* Free the memory allocated for the BCJ filters. */
|
|
#define xz_dec_bcj_end(s) kfree(s)
|
|
#endif
|
|
|
|
#endif
|