libxz/xz_private.h

/*
 * 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 <linux/kernel.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