1 /* 2 * Private includes and definitions 3 * 4 * Author: Lasse Collin <lasse.collin (at) 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
