lzrw3.h

h内核

/* > If the previous fact is true, the following facts must also be true:     */
/*   > src_len will be in the range [0,COMPRESS_MAX_COM].                     */
/*   > dst_len will be in the range [0,COMPRESS_MAX_ORG].                     */
/* > The input and output blocks must not overlap.                            */
/* > Only the output block is modified.                                       */
/* > Upon termination, the output block will consist of the bytes contained   */
/*   in the input block passed to the earlier compression operation.          */
/*                                                                            */
/******************************************************************************/

/******************************************************************************/
/*                                                                            */
/*                                    PORT.H                                  */
/*                                                                            */
/******************************************************************************/
/*                                                                            */
/* This module contains macro definitions and types that are likely to        */
/* change between computers.                                                  */
/*                                                                            */
/******************************************************************************/

#ifndef DONE_PORT       /* Only do this if not previously done.               */

   #ifdef THINK_C
      #define UBYTE unsigned char      /* Unsigned byte                       */
      #define UWORD unsigned int       /* Unsigned word (2 bytes)             */
      #define ULONG unsigned long      /* Unsigned word (4 bytes)             */
      #define BOOL  unsigned char      /* Boolean                             */
      #define FOPEN_BINARY_READ  "rb"  /* Mode string for binary reading.     */
      #define FOPEN_BINARY_WRITE "wb"  /* Mode string for binary writing.     */
      #define FOPEN_TEXT_APPEND  "a"   /* Mode string for text appending.     */
      #define REAL double              /* USed for floating point stuff.      */
   #endif
   #if defined(LINUX) || defined(linux)
      #define UBYTE __u8               /* Unsigned byte                       */
      #define UWORD __u16              /* Unsigned word (2 bytes)             */
      #define ULONG __u32              /* Unsigned word (4 bytes)             */
      #define LONG  __s32              /* Signed   word (4 bytes)             */
      #define BOOL  is not used here   /* Boolean                             */
      #define FOPEN_BINARY_READ  not used  /* Mode string for binary reading. */
      #define FOPEN_BINARY_WRITE not used  /* Mode string for binary writing. */
      #define FOPEN_TEXT_APPEND  not used  /* Mode string for text appending. */
      #define REAL not used                /* USed for floating point stuff.  */
      #ifndef TRUE
      #define TRUE 1
      #endif
   #endif

   #define DONE_PORT                   /* Don't do all this again.            */
   #define MALLOC_FAIL NULL            /* Failure status from malloc()        */
   #define LOCAL static                /* For non-exported routines.          */
   #define EXPORT                      /* Signals exported function.          */
   #define then                        /* Useful for aligning ifs.            */

#endif

/******************************************************************************/
/*                              End of PORT.H                                 */
/******************************************************************************/

#define COMPRESS_ACTION_IDENTITY   0
#define COMPRESS_ACTION_COMPRESS   1
#define COMPRESS_ACTION_DECOMPRESS 2

#define COMPRESS_OVERRUN 1024
#define COMPRESS_MAX_COM 0x70000000
#define COMPRESS_MAX_ORG (COMPRESS_MAX_COM-COMPRESS_OVERRUN)

#define COMPRESS_MAX_STRLEN 255

/* The following structure provides information about the algorithm.         */
/* > The top bit of id must be zero. The remaining bits must be chosen by    */
/*   the author of the algorithm by tossing a coin 31 times.                 */
/* > The amount of memory requested by the algorithm is specified in bytes   */
/*   and must be in the range [0,0x70000000].                                */
/* > All strings s must be such that strlen(s)<=COMPRESS_MAX_STRLEN.         */
struct compress_identity
  {
   ULONG id;           /* Identifying number of algorithm.            */
   ULONG memory;       /* Number of bytes of working memory required. */

   char  *name;        /* Name of algorithm.                          */
   char  *version;     /* Version number.                             */
   char  *date;        /* Date of release of this version.            */
   char  *copyright;   /* Copyright message.                          */

   char  *author;      /* Author of algorithm.                        */
   char  *affiliation; /* Affiliation of author.                      */
   char  *vendor;      /* Where the algorithm can be obtained.        */
  };

void  lzrw3_compress(        /* Single function interface to compression algorithm. */
UWORD     action,      /* Action to be performed.                             */
UBYTE   *wrk_mem,      /* Working memory temporarily given to routine to use. */
UBYTE   *src_adr,      /* Address of input  data.                             */
LONG     src_len,      /* Length  of input  data.                             */
UBYTE   *dst_adr,      /* Address of output data.                             */
void  *p_dst_len       /* Pointer to a longword where routine will write:     */
                       /*    If action=..IDENTITY   => Adr of id structure.   */
                       /*    If action=..COMPRESS   => Length of output data. */
                       /*    If action=..DECOMPRESS => Length of output data. */
);

/******************************************************************************/
/*                             End of COMPRESS.H                              */
/******************************************************************************/


/******************************************************************************/
/*                                  fast_copy.h                               */
/******************************************************************************/

/* This function copies a block of memory very quickly.                       */
/* The exact speed depends on the relative alignment of the blocks of memory. */
/* PRE  : 0<=src_len<=(2^32)-1 .                                              */
/* PRE  : Source and destination blocks must not overlap.                     */
/* POST : MEM[dst_adr,dst_adr+src_len-1]=MEM[src_adr,src_adr+src_len-1].      */
/* POST : MEM[dst_adr,dst_adr+src_len-1] is the only memory changed.          */

#define fast_copy(src,dst,len) memcpy(dst,src,len)

/******************************************************************************/
/*                               End of fast_copy.h                           */
/******************************************************************************/

#endif