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-rw-r--r--drivers/char/ftape/compressor/lzrw3.h253
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diff --git a/drivers/char/ftape/compressor/lzrw3.h b/drivers/char/ftape/compressor/lzrw3.h
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--- a/drivers/char/ftape/compressor/lzrw3.h
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-#ifndef _LZRW3_H
-#define _LZRW3_H
-/*
- * $Source: /homes/cvs/ftape-stacked/ftape/compressor/lzrw3.h,v $
- * $Revision: 1.1 $
- * $Date: 1997/10/05 19:12:30 $
- *
- * include files for lzrw3. Only slighty modified from the original
- * version. Assembles the three include files compress.h, port.h and
- * fastcopy.h from the original lzrw3 package.
- *
- */
-
-#include <linux/types.h>
-#include <linux/string.h>
-
-/******************************************************************************/
-/* */
-/* COMPRESS.H */
-/* */
-/******************************************************************************/
-/* */
-/* Author : Ross Williams. */
-/* Date : December 1989. */
-/* */
-/* This header file defines the interface to a set of functions called */
-/* 'compress', each member of which implements a particular data compression */
-/* algorithm. */
-/* */
-/* Normally in C programming, for each .H file, there is a corresponding .C */
-/* file that implements the functions promised in the .H file. */
-/* Here, there are many .C files corresponding to this header file. */
-/* Each comforming implementation file contains a single function */
-/* called 'compress' that implements a single data compression */
-/* algorithm that conforms with the interface specified in this header file. */
-/* Only one algorithm can be linked in at a time in this organization. */
-/* */
-/******************************************************************************/
-/* */
-/* DEFINITION OF FUNCTION COMPRESS */
-/* =============================== */
-/* */
-/* Summary of Function Compress */
-/* ---------------------------- */
-/* The action that 'compress' takes depends on its first argument called */
-/* 'action'. The function provides three actions: */
-/* */
-/* - Return information about the algorithm. */
-/* - Compress a block of memory. */
-/* - Decompress a block of memory. */
-/* */
-/* Parameters */
-/* ---------- */
-/* See the formal C definition later for a description of the parameters. */
-/* */
-/* Constants */
-/* --------- */
-/* COMPRESS_OVERRUN: The constant COMPRESS_OVERRUN defines by how many bytes */
-/* an algorithm is allowed to expand a block during a compression operation. */
-/* */
-/* Although compression algorithms usually compress data, there will always */
-/* be data that a given compressor will expand (this can be proven). */
-/* Fortunately, the degree of expansion can be limited to a single bit, by */
-/* copying over the input data if the data gets bigger during compression. */
-/* To allow for this possibility, the first bit of a compressed */
-/* representation can be used as a flag indicating whether the */
-/* input data was copied over, or truly compressed. In practice, the first */
-/* byte would be used to store this bit so as to maintain byte alignment. */
-/* */
-/* Unfortunately, in general, the only way to tell if an algorithm will */
-/* expand a particular block of data is to run the algorithm on the data. */
-/* If the algorithm does not continuously monitor how many output bytes it */
-/* has written, it might write an output block far larger than the input */
-/* block before realizing that it has done so. */
-/* On the other hand, continuous checks on output length are inefficient. */
-/* */
-/* To cater for all these problems, this interface definition: */
-/* > Allows a compression algorithm to return an output block that is up to */
-/* COMPRESS_OVERRUN bytes longer than the input block. */
-/* > Allows a compression algorithm to write up to COMPRESS_OVERRUN bytes */
-/* more than the length of the input block to the memory of the output */
-/* block regardless of the length of the output block eventually returned. */
-/* This allows an algorithm to overrun the length of the input block in the */
-/* output block by up to COMPRESS_OVERRUN bytes between expansion checks. */
-/* */
-/* The problem does not arise for decompression. */
-/* */
-/* Identity Action */
-/* --------------- */
-/* > action must be COMPRESS_ACTION_IDENTITY. */
-/* > p_dst_len must point to a longword to receive a longword address. */
-/* > The value of the other parameters does not matter. */
-/* > After execution, the longword that p_dst_len points to will be a pointer */
-/* to a structure of type compress_identity. */
-/* Thus, for example, after the call, (*p_dst_len)->memory will return the */
-/* number of bytes of working memory that the algorithm requires to run. */
-/* > The values of the identity structure returned are fixed constant */
-/* attributes of the algorithm and must not vary from call to call. */
-/* */
-/* Common Requirements for Compression and Decompression Actions */
-/* ------------------------------------------------------------- */
-/* > wrk_mem must point to an unused block of memory of a length specified in */
-/* the algorithm's identity block. The identity block can be obtained by */
-/* making a separate call to compress, specifying the identity action. */
-/* > The INPUT BLOCK is defined to be Memory[src_addr,src_addr+src_len-1]. */
-/* > dst_len will be used to denote *p_dst_len. */
-/* > dst_len is not read by compress, only written. */
-/* > The value of dst_len is defined only upon termination. */
-/* > The OUTPUT BLOCK is defined to be Memory[dst_addr,dst_addr+dst_len-1]. */
-/* */
-/* Compression Action */
-/* ------------------ */
-/* > action must be COMPRESS_ACTION_COMPRESS. */
-/* > src_len must be in the range [0,COMPRESS_MAX_ORG]. */
-/* > The OUTPUT ZONE is defined to be */
-/* Memory[dst_addr,dst_addr+src_len-1+COMPRESS_OVERRUN]. */
-/* > The function can modify any part of the output zone regardless of the */
-/* final length of the output block. */
-/* > The input block and the output zone must not overlap. */
-/* > dst_len will be in the range [0,src_len+COMPRESS_OVERRUN]. */
-/* > dst_len will be in the range [0,COMPRESS_MAX_COM] (from prev fact). */
-/* > The output block will consist of a representation of the input block. */
-/* */
-/* Decompression Action */
-/* -------------------- */
-/* > action must be COMPRESS_ACTION_DECOMPRESS. */
-/* > The input block must be the result of an earlier compression operation. */
-/* > 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