1. 根目录:
2. lib
3. lzo
4. lzodefs.h

/*
 *  lzodefs.h -- architecture, OS and compiler specific defines
 *
 *  Copyright (C) 1996-2012 Markus F.X.J. Oberhumer <markus@oberhumer.com>
 *
 *  The full LZO package can be found at:
 *  http://www.oberhumer.com/opensource/lzo/
 *
 *  Changed for Linux kernel use by:
 *  Nitin Gupta <nitingupta910@gmail.com>
 *  Richard Purdie <rpurdie@openedhand.com>
 */


#if 1 && defined(__arm__) && ((__LINUX_ARM_ARCH__ >= 6) || defined(__ARM_FEATURE_UNALIGNED))
#define CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 1
#define COPY4(dst, src)	\
		* (u32 *) (void *) (dst) = * (const u32 *) (const void *) (src)
#else
#define COPY4(dst, src)	\
		put_unaligned(get_unaligned((const u32 *)(src)), (u32 *)(dst))
#endif
#if defined(__x86_64__)
#define COPY8(dst, src)	\
		put_unaligned(get_unaligned((const u64 *)(src)), (u64 *)(dst))
#else
#define COPY8(dst, src)	\
		COPY4(dst, src); COPY4((dst) + 4, (src) + 4)
#endif

#if defined(__BIG_ENDIAN) && defined(__LITTLE_ENDIAN)
#error "conflicting endian definitions"
#elif defined(__x86_64__)
#define LZO_USE_CTZ64	1
#define LZO_USE_CTZ32	1
#elif defined(__i386__) || defined(__powerpc__)
#define LZO_USE_CTZ32	1
#elif defined(__arm__) && (__LINUX_ARM_ARCH__ >= 5)
#define LZO_USE_CTZ32	1
#endif

#define M1_MAX_OFFSET	0x0400
#define M2_MAX_OFFSET	0x0800
#define M3_MAX_OFFSET	0x4000
#define M4_MAX_OFFSET	0xbfff

#define M1_MIN_LEN	2
#define M1_MAX_LEN	2
#define M2_MIN_LEN	3
#define M2_MAX_LEN	8
#define M3_MIN_LEN	3
#define M3_MAX_LEN	33
#define M4_MIN_LEN	3
#define M4_MAX_LEN	9

#define M1_MARKER	0
#define M2_MARKER	64
#define M3_MARKER	32
#define M4_MARKER	16

#define lzo_dict_t      unsigned short
#define D_BITS		13
#define D_SIZE		(1u << D_BITS)
#define D_MASK		(D_SIZE - 1)
#define D_HIGH		((D_MASK >> 1) + 1)