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TOMOYO Linux Cross Reference
Linux/lib/xz/xz_private.h

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

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