release/src/router/busybox/archival/libarchive/unxz/xz_private.h

   1 /*
   2  * Private includes and definitions
   3  *
   4  * Author: Lasse Collin <lasse.collin@tukaani.org>
   5  *
   6  * This file has been put into the public domain.
   7  * You can do whatever you want with this file.
   8  */
   9
  10 #ifndef XZ_PRIVATE_H
  11 #define XZ_PRIVATE_H
  12
  13 #ifdef __KERNEL__
  14         /* XZ_PREBOOT may be defined only via decompress_unxz.c. */
  15 #       ifndef XZ_PREBOOT
  16 #               include <linux/slab.h>
  17 #               include <linux/vmalloc.h>
  18 #               include <linux/string.h>
  19 #               define memeq(a, b, size) (memcmp(a, b, size) == 0)
  20 #               define memzero(buf, size) memset(buf, 0, size)
  21 #       endif
  22 #       include <asm/byteorder.h>
  23 #       include <asm/unaligned.h>
  24 #       define get_le32(p) le32_to_cpup((const uint32_t *)(p))
  25         /* XZ_IGNORE_KCONFIG may be defined only via decompress_unxz.c. */
  26 #       ifndef XZ_IGNORE_KCONFIG
  27 #               ifdef CONFIG_XZ_DEC_X86
  28 #                       define XZ_DEC_X86
  29 #               endif
  30 #               ifdef CONFIG_XZ_DEC_POWERPC
  31 #                       define XZ_DEC_POWERPC
  32 #               endif
  33 #               ifdef CONFIG_XZ_DEC_IA64
  34 #                       define XZ_DEC_IA64
  35 #               endif
  36 #               ifdef CONFIG_XZ_DEC_ARM
  37 #                       define XZ_DEC_ARM
  38 #               endif
  39 #               ifdef CONFIG_XZ_DEC_ARMTHUMB
  40 #                       define XZ_DEC_ARMTHUMB
  41 #               endif
  42 #               ifdef CONFIG_XZ_DEC_SPARC
  43 #                       define XZ_DEC_SPARC
  44 #               endif
  45 #       endif
  46 #       include <linux/xz.h>
  47 #else
  48         /*
  49          * For userspace builds, use a separate header to define the required
  50          * macros and functions. This makes it easier to adapt the code into
  51          * different environments and avoids clutter in the Linux kernel tree.
  52          */
  53 #       include "xz_config.h"
  54 #endif
  55
  56 /* If no specific decoding mode is requested, enable support for all modes. */
  57 #if !defined(XZ_DEC_SINGLE) && !defined(XZ_DEC_PREALLOC) \
  58                 && !defined(XZ_DEC_DYNALLOC)
  59 #       define XZ_DEC_SINGLE
  60 #       define XZ_DEC_PREALLOC
  61 #       define XZ_DEC_DYNALLOC
  62 #endif
  63
  64 /*
  65  * The DEC_IS_foo(mode) macros are used in "if" statements. If only some
  66  * of the supported modes are enabled, these macros will evaluate to true or
  67  * false at compile time and thus allow the compiler to omit unneeded code.
  68  */
  69 #ifdef XZ_DEC_SINGLE
  70 #       define DEC_IS_SINGLE(mode) ((mode) == XZ_SINGLE)
  71 #else
  72 #       define DEC_IS_SINGLE(mode) (false)
  73 #endif
  74
  75 #ifdef XZ_DEC_PREALLOC
  76 #       define DEC_IS_PREALLOC(mode) ((mode) == XZ_PREALLOC)
  77 #else
  78 #       define DEC_IS_PREALLOC(mode) (false)
  79 #endif
  80
  81 #ifdef XZ_DEC_DYNALLOC
  82 #       define DEC_IS_DYNALLOC(mode) ((mode) == XZ_DYNALLOC)
  83 #else
  84 #       define DEC_IS_DYNALLOC(mode) (false)
  85 #endif
  86
  87 #if !defined(XZ_DEC_SINGLE)
  88 #       define DEC_IS_MULTI(mode) (true)
  89 #elif defined(XZ_DEC_PREALLOC) || defined(XZ_DEC_DYNALLOC)
  90 #       define DEC_IS_MULTI(mode) ((mode) != XZ_SINGLE)
  91 #else
  92 #       define DEC_IS_MULTI(mode) (false)
  93 #endif
  94
  95 /*
  96  * If any of the BCJ filter decoders are wanted, define XZ_DEC_BCJ.
  97  * XZ_DEC_BCJ is used to enable generic support for BCJ decoders.
  98  */
  99 #ifndef XZ_DEC_BCJ
 100 #       if defined(XZ_DEC_X86) || defined(XZ_DEC_POWERPC) \
 101                         || defined(XZ_DEC_IA64) || defined(XZ_DEC_ARM) \
 102                         || defined(XZ_DEC_ARM) || defined(XZ_DEC_ARMTHUMB) \
 103                         || defined(XZ_DEC_SPARC)
 104 #               define XZ_DEC_BCJ
 105 #       endif
 106 #endif
 107
 108 /*
 109  * Allocate memory for LZMA2 decoder. xz_dec_lzma2_reset() must be used
 110  * before calling xz_dec_lzma2_run().
 111  */
 112 XZ_EXTERN struct xz_dec_lzma2 * XZ_FUNC xz_dec_lzma2_create(
 113                 enum xz_mode mode, uint32_t dict_max);
 114
 115 /*
 116  * Decode the LZMA2 properties (one byte) and reset the decoder. Return
 117  * XZ_OK on success, XZ_MEMLIMIT_ERROR if the preallocated dictionary is not
 118  * big enough, and XZ_OPTIONS_ERROR if props indicates something that this
 119  * decoder doesn't support.
 120  */
 121 XZ_EXTERN enum xz_ret XZ_FUNC xz_dec_lzma2_reset(
 122                 struct xz_dec_lzma2 *s, uint8_t props);
 123
 124 /* Decode raw LZMA2 stream from b->in to b->out. */
 125 XZ_EXTERN enum xz_ret XZ_FUNC xz_dec_lzma2_run(
 126                 struct xz_dec_lzma2 *s, struct xz_buf *b);
 127
 128 /* Free the memory allocated for the LZMA2 decoder. */
 129 XZ_EXTERN void XZ_FUNC xz_dec_lzma2_end(struct xz_dec_lzma2 *s);
 130
 131 #ifdef XZ_DEC_BCJ
 132 /*
 133  * Allocate memory for BCJ decoders. xz_dec_bcj_reset() must be used before
 134  * calling xz_dec_bcj_run().
 135  */
 136 XZ_EXTERN struct xz_dec_bcj * XZ_FUNC xz_dec_bcj_create(bool single_call);
 137
 138 /*
 139  * Decode the Filter ID of a BCJ filter. This implementation doesn't
 140  * support custom start offsets, so no decoding of Filter Properties
 141  * is needed. Returns XZ_OK if the given Filter ID is supported.
 142  * Otherwise XZ_OPTIONS_ERROR is returned.
 143  */
 144 XZ_EXTERN enum xz_ret XZ_FUNC xz_dec_bcj_reset(
 145                 struct xz_dec_bcj *s, uint8_t id);
 146
 147 /*
 148  * Decode raw BCJ + LZMA2 stream. This must be used only if there actually is
 149  * a BCJ filter in the chain. If the chain has only LZMA2, xz_dec_lzma2_run()
 150  * must be called directly.
 151  */
 152 XZ_EXTERN enum xz_ret XZ_FUNC xz_dec_bcj_run(struct xz_dec_bcj *s,
 153                 struct xz_dec_lzma2 *lzma2, struct xz_buf *b);
 154
 155 /* Free the memory allocated for the BCJ filters. */
 156 #define xz_dec_bcj_end(s) kfree(s)
 157 #endif
 158
 159 #endif