157 lines
4.4 KiB
C
157 lines
4.4 KiB
C
/*
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* Private includes and definitions
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*
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* Author: Lasse Collin <lasse.collin@tukaani.org>
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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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/*
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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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