arch/ppc64/boot/zlib.h

   1 /*              */
   2
   3 /*
   4  * This file is derived from zlib.h and zconf.h from the zlib-0.95
   5  * distribution by Jean-loup Gailly and Mark Adler, with some additions
   6  * by Paul Mackerras to aid in implementing Deflate compression and
   7  * decompression for PPP packets.
   8  */
   9
  10 /*
  11  *  ==FILEVERSION 960122==
  12  *
  13  * This marker is used by the Linux installation script to determine
  14  * whether an up-to-date version of this file is already installed.
  15  */
  16
  17 /* zlib.h -- interface of the 'zlib' general purpose compression library
  18   version 0.95, Aug 16th, 1995.
  19
  20   Copyright (C) 1995 Jean-loup Gailly and Mark Adler
  21
  22   This software is provided 'as-is', without any express or implied
  23   warranty.  In no event will the authors be held liable for any damages
  24   arising from the use of this software.
  25
  26   Permission is granted to anyone to use this software for any purpose,
  27   including commercial applications, and to alter it and redistribute it
  28   freely, subject to the following restrictions:
  29
  30   1. The origin of this software must not be misrepresented; you must not
  31      claim that you wrote the original software. If you use this software
  32      in a product, an acknowledgment in the product documentation would be
  33      appreciated but is not required.
  34   2. Altered source versions must be plainly marked as such, and must not be
  35      misrepresented as being the original software.
  36   3. This notice may not be removed or altered from any source distribution.
  37
  38   Jean-loup Gailly        Mark Adler
  39   gzip@prep.ai.mit.edu    madler@alumni.caltech.edu
  40  */
  41
  42 #ifndef _ZLIB_H
  43 #define _ZLIB_H
  44
  45 /* #include "zconf.h" */        /* included directly here */
  46
  47 /* zconf.h -- configuration of the zlib compression library
  48  * Copyright (C) 1995 Jean-loup Gailly.
  49  * For conditions of distribution and use, see copyright notice in zlib.h
  50  */
  51
  52 /* From: zconf.h,v 1.12 1995/05/03 17:27:12 jloup Exp */
  53
  54 /*
  55      The library does not install any signal handler. It is recommended to
  56   add at least a handler for SIGSEGV when decompressing; the library checks
  57   the consistency of the input data whenever possible but may go nuts
  58   for some forms of corrupted input.
  59  */
  60
  61 /*
  62  * Compile with -DMAXSEG_64K if the alloc function cannot allocate more
  63  * than 64k bytes at a time (needed on systems with 16-bit int).
  64  * Compile with -DUNALIGNED_OK if it is OK to access shorts or ints
  65  * at addresses which are not a multiple of their size.
  66  * Under DOS, -DFAR=far or -DFAR=__far may be needed.
  67  */
  68
  69 #ifndef STDC
  70 #  if defined(MSDOS) || defined(__STDC__) || defined(__cplusplus)
  71 #    define STDC
  72 #  endif
  73 #endif
  74
  75 #ifdef  __MWERKS__ /* Metrowerks CodeWarrior declares fileno() in unix.h */
  76 #  include <unix.h>
  77 #endif
  78
  79 /* Maximum value for memLevel in deflateInit2 */
  80 #ifndef MAX_MEM_LEVEL
  81 #  ifdef MAXSEG_64K
  82 #    define MAX_MEM_LEVEL 8
  83 #  else
  84 #    define MAX_MEM_LEVEL 9
  85 #  endif
  86 #endif
  87
  88 #ifndef FAR
  89 #  define FAR
  90 #endif
  91
  92 /* Maximum value for windowBits in deflateInit2 and inflateInit2 */
  93 #ifndef MAX_WBITS
  94 #  define MAX_WBITS   15 /* 32K LZ77 window */
  95 #endif
  96
  97 /* The memory requirements for deflate are (in bytes):
  98             1 << (windowBits+2)   +  1 << (memLevel+9)
  99  that is: 128K for windowBits=15  +  128K for memLevel = 8  (default values)
 100  plus a few kilobytes for small objects. For example, if you want to reduce
 101  the default memory requirements from 256K to 128K, compile with
 102      make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
 103  Of course this will generally degrade compression (there's no free lunch).
 104
 105    The memory requirements for inflate are (in bytes) 1 << windowBits
 106  that is, 32K for windowBits=15 (default value) plus a few kilobytes
 107  for small objects.
 108 */
 109
 110                         /* Type declarations */
 111
 112 #ifndef OF /* function prototypes */
 113 #  ifdef STDC
 114 #    define OF(args)  args
 115 #  else
 116 #    define OF(args)  ()
 117 #  endif
 118 #endif
 119
 120 typedef unsigned char  Byte;  /* 8 bits */
 121 typedef unsigned int   uInt;  /* 16 bits or more */
 122 typedef unsigned long  uLong; /* 32 bits or more */
 123
 124 typedef Byte FAR Bytef;
 125 typedef char FAR charf;
 126 typedef int FAR intf;
 127 typedef uInt FAR uIntf;
 128 typedef uLong FAR uLongf;
 129
 130 #ifdef STDC
 131    typedef void FAR *voidpf;
 132    typedef void     *voidp;
 133 #else
 134    typedef Byte FAR *voidpf;
 135    typedef Byte     *voidp;
 136 #endif
 137
 138 /* end of original zconf.h */
 139
 140 #define ZLIB_VERSION "0.95P"
 141
 142 /*
 143      The 'zlib' compression library provides in-memory compression and
 144   decompression functions, including integrity checks of the uncompressed
 145   data.  This version of the library supports only one compression method
 146   (deflation) but other algorithms may be added later and will have the same
 147   stream interface.
 148
 149      For compression the application must provide the output buffer and
 150   may optionally provide the input buffer for optimization. For decompression,
 151   the application must provide the input buffer and may optionally provide
 152   the output buffer for optimization.
 153
 154      Compression can be done in a single step if the buffers are large
 155   enough (for example if an input file is mmap'ed), or can be done by
 156   repeated calls of the compression function.  In the latter case, the
 157   application must provide more input and/or consume the output
 158   (providing more output space) before each call.
 159 */
 160
 161 typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
 162 typedef void   (*free_func)  OF((voidpf opaque, voidpf address, uInt nbytes));
 163
 164 struct internal_state;
 165
 166 typedef struct z_stream_s {
 167     Bytef    *next_in;  /* next input byte */
 168     uInt     avail_in;  /* number of bytes available at next_in */
 169     uLong    total_in;  /* total nb of input bytes read so far */
 170
 171     Bytef    *next_out; /* next output byte should be put there */
 172     uInt     avail_out; /* remaining free space at next_out */
 173     uLong    total_out; /* total nb of bytes output so far */
 174
 175     char     *msg;      /* last error message, NULL if no error */
 176     struct internal_state FAR *state; /* not visible by applications */
 177
 178     alloc_func zalloc;  /* used to allocate the internal state */
 179     free_func  zfree;   /* used to free the internal state */
 180     voidp      opaque;  /* private data object passed to zalloc and zfree */
 181
 182     Byte     data_type; /* best guess about the data type: ascii or binary */
 183
 184 } z_stream;
 185
 186 /*
 187    The application must update next_in and avail_in when avail_in has
 188    dropped to zero. It must update next_out and avail_out when avail_out
 189    has dropped to zero. The application must initialize zalloc, zfree and
 190    opaque before calling the init function. All other fields are set by the
 191    compression library and must not be updated by the application.
 192
 193    The opaque value provided by the application will be passed as the first
 194    parameter for calls of zalloc and zfree. This can be useful for custom
 195    memory management. The compression library attaches no meaning to the
 196    opaque value.
 197
 198    zalloc must return Z_NULL if there is not enough memory for the object.
 199    On 16-bit systems, the functions zalloc and zfree must be able to allocate
 200    exactly 65536 bytes, but will not be required to allocate more than this
 201    if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS,
 202    pointers returned by zalloc for objects of exactly 65536 bytes *must*
 203    have their offset normalized to zero. The default allocation function
 204    provided by this library ensures this (see zutil.c). To reduce memory
 205    requirements and avoid any allocation of 64K objects, at the expense of
 206    compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h).
 207
 208    The fields total_in and total_out can be used for statistics or
 209    progress reports. After compression, total_in holds the total size of
 210    the uncompressed data and may be saved for use in the decompressor
 211    (particularly if the decompressor wants to decompress everything in
 212    a single step).
 213 */
 214
 215                         /* constants */
 216
 217 #define Z_NO_FLUSH      0
 218 #define Z_PARTIAL_FLUSH 1
 219 #define Z_FULL_FLUSH    2
 220 #define Z_SYNC_FLUSH    3 /* experimental: partial_flush + byte align */
 221 #define Z_FINISH        4
 222 #define Z_PACKET_FLUSH  5
 223 /* See deflate() below for the usage of these constants */
 224
 225 #define Z_OK            0
 226 #define Z_STREAM_END    1
 227 #define Z_ERRNO        (-1)
 228 #define Z_STREAM_ERROR (-2)
 229 #define Z_DATA_ERROR   (-3)
 230 #define Z_MEM_ERROR    (-4)
 231 #define Z_BUF_ERROR    (-5)
 232 /* error codes for the compression/decompression functions */
 233
 234 #define Z_BEST_SPEED             1
 235 #define Z_BEST_COMPRESSION       9
 236 #define Z_DEFAULT_COMPRESSION  (-1)
 237 /* compression levels */
 238
 239 #define Z_FILTERED            1
 240 #define Z_HUFFMAN_ONLY        2
 241 #define Z_DEFAULT_STRATEGY    0
 242
 243 #define Z_BINARY   0
 244 #define Z_ASCII    1
 245 #define Z_UNKNOWN  2
 246 /* Used to set the data_type field */
 247
 248 #define Z_NULL  0  /* for initializing zalloc, zfree, opaque */
 249
 250 extern char *zlib_version;
 251 /* The application can compare zlib_version and ZLIB_VERSION for consistency.
 252    If the first character differs, the library code actually used is
 253    not compatible with the zlib.h header file used by the application.
 254  */
 255
 256                         /* basic functions */
 257
 258 extern int inflateInit OF((z_stream *strm));
 259 /*
 260      Initializes the internal stream state for decompression. The fields
 261    zalloc and zfree must be initialized before by the caller.  If zalloc and
 262    zfree are set to Z_NULL, inflateInit updates them to use default allocation
 263    functions.
 264
 265      inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
 266    enough memory.  msg is set to null if there is no error message.
 267    inflateInit does not perform any decompression: this will be done by
 268    inflate().
 269 */
 270
 271
 272 extern int inflate OF((z_stream *strm, int flush));
 273 /*
 274   Performs one or both of the following actions:
 275
 276   - Decompress more input starting at next_in and update next_in and avail_in
 277     accordingly. If not all input can be processed (because there is not
 278     enough room in the output buffer), next_in is updated and processing
 279     will resume at this point for the next call of inflate().
 280
 281   - Provide more output starting at next_out and update next_out and avail_out
 282     accordingly.  inflate() always provides as much output as possible
 283     (until there is no more input data or no more space in the output buffer).
 284
 285   Before the call of inflate(), the application should ensure that at least
 286   one of the actions is possible, by providing more input and/or consuming
 287   more output, and updating the next_* and avail_* values accordingly.
 288   The application can consume the uncompressed output when it wants, for
 289   example when the output buffer is full (avail_out == 0), or after each
 290   call of inflate().
 291
 292     If the parameter flush is set to Z_PARTIAL_FLUSH or Z_PACKET_FLUSH,
 293   inflate flushes as much output as possible to the output buffer. The
 294   flushing behavior of inflate is not specified for values of the flush
 295   parameter other than Z_PARTIAL_FLUSH, Z_PACKET_FLUSH or Z_FINISH, but the
 296   current implementation actually flushes as much output as possible
 297   anyway.  For Z_PACKET_FLUSH, inflate checks that once all the input data
 298   has been consumed, it is expecting to see the length field of a stored
 299   block; if not, it returns Z_DATA_ERROR.
 300
 301     inflate() should normally be called until it returns Z_STREAM_END or an
 302   error. However if all decompression is to be performed in a single step
 303   (a single call of inflate), the parameter flush should be set to
 304   Z_FINISH. In this case all pending input is processed and all pending
 305   output is flushed; avail_out must be large enough to hold all the
 306   uncompressed data. (The size of the uncompressed data may have been saved
 307   by the compressor for this purpose.) The next operation on this stream must
 308   be inflateEnd to deallocate the decompression state. The use of Z_FINISH
 309   is never required, but can be used to inform inflate that a faster routine
 310   may be used for the single inflate() call.
 311
 312     inflate() returns Z_OK if some progress has been made (more input
 313   processed or more output produced), Z_STREAM_END if the end of the
 314   compressed data has been reached and all uncompressed output has been
 315   produced, Z_DATA_ERROR if the input data was corrupted, Z_STREAM_ERROR if
 316   the stream structure was inconsistent (for example if next_in or next_out
 317   was NULL), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR if no
 318   progress is possible or if there was not enough room in the output buffer
 319   when Z_FINISH is used. In the Z_DATA_ERROR case, the application may then
 320   call inflateSync to look for a good compression block.  */
 321
 322
 323 extern int inflateEnd OF((z_stream *strm));
 324 /*
 325      All dynamically allocated data structures for this stream are freed.
 326    This function discards any unprocessed input and does not flush any
 327    pending output.
 328
 329      inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state
 330    was inconsistent. In the error case, msg may be set but then points to a
 331    static string (which must not be deallocated).
 332 */
 333
 334                         /* advanced functions */
 335
 336 extern int inflateInit2 OF((z_stream *strm,
 337                             int  windowBits));
 338 /*
 339      This is another version of inflateInit with more compression options. The
 340    fields next_out, zalloc and zfree must be initialized before by the caller.
 341
 342      The windowBits parameter is the base two logarithm of the maximum window
 343    size (the size of the history buffer).  It should be in the range 8..15 for
 344    this version of the library (the value 16 will be allowed soon). The
 345    default value is 15 if inflateInit is used instead. If a compressed stream
 346    with a larger window size is given as input, inflate() will return with
 347    the error code Z_DATA_ERROR instead of trying to allocate a larger window.
 348
 349      If next_out is not null, the library will use this buffer for the history
 350    buffer; the buffer must either be large enough to hold the entire output
 351    data, or have at least 1<<windowBits bytes.  If next_out is null, the
 352    library will allocate its own buffer (and leave next_out null). next_in
 353    need not be provided here but must be provided by the application for the
 354    next call of inflate().
 355
 356      If the history buffer is provided by the application, next_out must
 357    never be changed by the application since the decompressor maintains
 358    history information inside this buffer from call to call; the application
 359    can only reset next_out to the beginning of the history buffer when
 360    avail_out is zero and all output has been consumed.
 361
 362       inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
 363    not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
 364    windowBits < 8). msg is set to null if there is no error message.
 365    inflateInit2 does not perform any decompression: this will be done by
 366    inflate().
 367 */
 368
 369 extern int inflateSync OF((z_stream *strm));
 370 /*
 371     Skips invalid compressed data until the special marker (see deflate()
 372   above) can be found, or until all available input is skipped. No output
 373   is provided.
 374
 375     inflateSync returns Z_OK if the special marker has been found, Z_BUF_ERROR
 376   if no more input was provided, Z_DATA_ERROR if no marker has been found,
 377   or Z_STREAM_ERROR if the stream structure was inconsistent. In the success
 378   case, the application may save the current current value of total_in which
 379   indicates where valid compressed data was found. In the error case, the
 380   application may repeatedly call inflateSync, providing more input each time,
 381   until success or end of the input data.
 382 */
 383
 384 extern int inflateReset OF((z_stream *strm));
 385 /*
 386      This function is equivalent to inflateEnd followed by inflateInit,
 387    but does not free and reallocate all the internal decompression state.
 388    The stream will keep attributes that may have been set by inflateInit2.
 389
 390       inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
 391    stream state was inconsistent (such as zalloc or state being NULL).
 392 */
 393
 394 extern int inflateIncomp OF((z_stream *strm));
 395 /*
 396      This function adds the data at next_in (avail_in bytes) to the output
 397    history without performing any output.  There must be no pending output,
 398    and the decompressor must be expecting to see the start of a block.
 399    Calling this function is equivalent to decompressing a stored block
 400    containing the data at next_in (except that the data is not output).
 401 */
 402
 403                         /* checksum functions */
 404
 405 /*
 406      This function is not related to compression but is exported
 407    anyway because it might be useful in applications using the
 408    compression library.
 409 */
 410
 411 extern uLong adler32 OF((uLong adler, Bytef *buf, uInt len));
 412
 413 /*
 414      Update a running Adler-32 checksum with the bytes buf[0..len-1] and
 415    return the updated checksum. If buf is NULL, this function returns
 416    the required initial value for the checksum.
 417    An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
 418    much faster. Usage example:
 419
 420      uLong adler = adler32(0L, Z_NULL, 0);
 421
 422      while (read_buffer(buffer, length) != EOF) {
 423        adler = adler32(adler, buffer, length);
 424      }
 425      if (adler != original_adler) error();
 426 */
 427
 428 #ifndef _Z_UTIL_H
 429     struct internal_state {int dummy;}; /* hack for buggy compilers */
 430 #endif
 431
 432 #endif /* _ZLIB_H */