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160 lines
4.5 KiB
160 lines
4.5 KiB
/* |
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* Private includes and definitions |
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* |
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* Author: Lasse Collin <[email protected]> |
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* |
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* This file has been put into the public domain. |
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* You can do whatever you want with this file. |
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*/ |
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#ifndef XZ_PRIVATE_H |
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#define XZ_PRIVATE_H |
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#ifdef __KERNEL__ |
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# include <linux/xz.h> |
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# include <linux/kernel.h> |
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# include <asm/unaligned.h> |
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/* XZ_PREBOOT may be defined only via decompress_unxz.c. */ |
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# ifndef XZ_PREBOOT |
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# include <linux/slab.h> |
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# include <linux/vmalloc.h> |
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# include <linux/string.h> |
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# ifdef CONFIG_XZ_DEC_X86 |
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# define XZ_DEC_X86 |
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# endif |
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# ifdef CONFIG_XZ_DEC_POWERPC |
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# define XZ_DEC_POWERPC |
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# endif |
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# ifdef CONFIG_XZ_DEC_IA64 |
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# define XZ_DEC_IA64 |
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# endif |
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# ifdef CONFIG_XZ_DEC_ARM |
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# define XZ_DEC_ARM |
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# endif |
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# ifdef CONFIG_XZ_DEC_ARMTHUMB |
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# define XZ_DEC_ARMTHUMB |
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# endif |
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# ifdef CONFIG_XZ_DEC_SPARC |
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# define XZ_DEC_SPARC |
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# endif |
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# define memeq(a, b, size) (memcmp(a, b, size) == 0) |
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# define memzero(buf, size) memset(buf, 0, size) |
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# endif |
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# define get_le32(p) le32_to_cpup((const uint32_t *)(p)) |
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#else |
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/* |
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* For userspace builds, use a separate header to define the required |
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* macros and functions. This makes it easier to adapt the code into |
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* different environments and avoids clutter in the Linux kernel tree. |
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*/ |
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# include "xz_config.h" |
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#endif |
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/* If no specific decoding mode is requested, enable support for all modes. */ |
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#if !defined(XZ_DEC_SINGLE) && !defined(XZ_DEC_PREALLOC) \ |
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&& !defined(XZ_DEC_DYNALLOC) |
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# define XZ_DEC_SINGLE |
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# define XZ_DEC_PREALLOC |
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# define XZ_DEC_DYNALLOC |
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#endif |
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/* |
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* The DEC_IS_foo(mode) macros are used in "if" statements. If only some |
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* of the supported modes are enabled, these macros will evaluate to true or |
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* false at compile time and thus allow the compiler to omit unneeded code. |
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*/ |
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#ifdef XZ_DEC_SINGLE |
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# define DEC_IS_SINGLE(mode) ((mode) == XZ_SINGLE) |
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#else |
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# define DEC_IS_SINGLE(mode) (false) |
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#endif |
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#ifdef XZ_DEC_PREALLOC |
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# define DEC_IS_PREALLOC(mode) ((mode) == XZ_PREALLOC) |
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#else |
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# define DEC_IS_PREALLOC(mode) (false) |
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#endif |
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#ifdef XZ_DEC_DYNALLOC |
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# define DEC_IS_DYNALLOC(mode) ((mode) == XZ_DYNALLOC) |
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#else |
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# define DEC_IS_DYNALLOC(mode) (false) |
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#endif |
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#if !defined(XZ_DEC_SINGLE) |
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# define DEC_IS_MULTI(mode) (true) |
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#elif defined(XZ_DEC_PREALLOC) || defined(XZ_DEC_DYNALLOC) |
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# define DEC_IS_MULTI(mode) ((mode) != XZ_SINGLE) |
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#else |
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# define DEC_IS_MULTI(mode) (false) |
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#endif |
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/* |
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* If any of the BCJ filter decoders are wanted, define XZ_DEC_BCJ. |
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* XZ_DEC_BCJ is used to enable generic support for BCJ decoders. |
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*/ |
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#ifndef XZ_DEC_BCJ |
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# if defined(XZ_DEC_X86) || defined(XZ_DEC_POWERPC) \ |
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|| defined(XZ_DEC_IA64) || defined(XZ_DEC_ARM) \ |
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|| defined(XZ_DEC_ARM) || defined(XZ_DEC_ARMTHUMB) \ |
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|| defined(XZ_DEC_SPARC) |
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# define XZ_DEC_BCJ |
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# endif |
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#endif |
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#ifndef CRC32_POLY_LE |
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#define CRC32_POLY_LE 0xedb88320 |
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#endif |
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/* |
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* Allocate memory for LZMA2 decoder. xz_dec_lzma2_reset() must be used |
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* before calling xz_dec_lzma2_run(). |
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*/ |
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XZ_EXTERN struct xz_dec_lzma2 *xz_dec_lzma2_create(enum xz_mode mode, |
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uint32_t dict_max); |
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/* |
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* Decode the LZMA2 properties (one byte) and reset the decoder. Return |
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* XZ_OK on success, XZ_MEMLIMIT_ERROR if the preallocated dictionary is not |
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* big enough, and XZ_OPTIONS_ERROR if props indicates something that this |
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* decoder doesn't support. |
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*/ |
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XZ_EXTERN enum xz_ret xz_dec_lzma2_reset(struct xz_dec_lzma2 *s, |
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uint8_t props); |
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/* Decode raw LZMA2 stream from b->in to b->out. */ |
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XZ_EXTERN enum xz_ret xz_dec_lzma2_run(struct xz_dec_lzma2 *s, |
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struct xz_buf *b); |
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/* Free the memory allocated for the LZMA2 decoder. */ |
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XZ_EXTERN void xz_dec_lzma2_end(struct xz_dec_lzma2 *s); |
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#ifdef XZ_DEC_BCJ |
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/* |
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* Allocate memory for BCJ decoders. xz_dec_bcj_reset() must be used before |
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* calling xz_dec_bcj_run(). |
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*/ |
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XZ_EXTERN struct xz_dec_bcj *xz_dec_bcj_create(bool single_call); |
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/* |
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* Decode the Filter ID of a BCJ filter. This implementation doesn't |
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* support custom start offsets, so no decoding of Filter Properties |
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* is needed. Returns XZ_OK if the given Filter ID is supported. |
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* Otherwise XZ_OPTIONS_ERROR is returned. |
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*/ |
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XZ_EXTERN enum xz_ret xz_dec_bcj_reset(struct xz_dec_bcj *s, uint8_t id); |
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/* |
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* Decode raw BCJ + LZMA2 stream. This must be used only if there actually is |
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* a BCJ filter in the chain. If the chain has only LZMA2, xz_dec_lzma2_run() |
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* must be called directly. |
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*/ |
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XZ_EXTERN enum xz_ret xz_dec_bcj_run(struct xz_dec_bcj *s, |
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struct xz_dec_lzma2 *lzma2, |
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struct xz_buf *b); |
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/* Free the memory allocated for the BCJ filters. */ |
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#define xz_dec_bcj_end(s) kfree(s) |
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#endif |
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#endif
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