uboot/include/u-boot/zlib.h
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   1/*
   2 * This file is derived from zlib.h and zconf.h from the zlib-1.2.3
   3 * distribution by Jean-loup Gailly and Mark Adler, with some additions
   4 * by Paul Mackerras to aid in implementing Deflate compression and
   5 * decompression for PPP packets.
   6 */
   7
   8 /*
   9  * ==FILEVERSION 960122==
  10  *
  11  * This marker is used by the Linux installation script to determine
  12  * whether an up-to-date version of this file is already installed.
  13  */
  14
  15/* zlib.h -- interface of the 'zlib' general purpose compression library
  16  version 1.2.3, July 18th, 2005
  17
  18  Copyright (C) 1995-2005 Jean-loup Gailly and Mark Adler
  19
  20  This software is provided 'as-is', without any express or implied
  21  warranty.  In no event will the authors be held liable for any damages
  22  arising from the use of this software.
  23
  24  Permission is granted to anyone to use this software for any purpose,
  25  including commercial applications, and to alter it and redistribute it
  26  freely, subject to the following restrictions:
  27
  28  1. The origin of this software must not be misrepresented; you must not
  29     claim that you wrote the original software. If you use this software
  30     in a product, an acknowledgment in the product documentation would be
  31     appreciated but is not required.
  32  2. Altered source versions must be plainly marked as such, and must not be
  33     misrepresented as being the original software.
  34  3. This notice may not be removed or altered from any source distribution.
  35
  36  Jean-loup Gailly        Mark Adler
  37  jloup@gzip.org          madler@alumni.caltech.edu
  38
  39
  40  The data format used by the zlib library is described by RFCs (Request for
  41  Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt
  42  (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format).
  43*/
  44
  45#ifndef ZLIB_H
  46#define ZLIB_H
  47
  48#ifdef __cplusplus
  49extern "C" {
  50#endif
  51
  52#define ZLIB_VERSION "1.2.3"
  53#define ZLIB_VERNUM 0x1230
  54
  55/* #include "zconf.h" */        /* included directly here */
  56/* zconf.h -- configuration of the zlib compression library
  57 * Copyright (C) 1995-2005 Jean-loup Gailly.
  58 * For conditions of distribution and use, see copyright notice in zlib.h
  59 */
  60
  61/* Begin of new zconf.h */
  62/*
  63 * If you *really* need a unique prefix for all types and library functions,
  64 * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it.
  65 */
  66#ifdef Z_PREFIX
  67#  define deflateInit_          z_deflateInit_
  68#  define deflate               z_deflate
  69#  define deflateEnd            z_deflateEnd
  70#  define inflateInit_          z_inflateInit_
  71#  define inflate               z_inflate
  72#  define inflateEnd            z_inflateEnd
  73#  define deflateInit2_         z_deflateInit2_
  74#  define deflateSetDictionary  z_deflateSetDictionary
  75#  define deflateCopy           z_deflateCopy
  76#  define deflateReset          z_deflateReset
  77#  define deflateParams         z_deflateParams
  78#  define deflateBound          z_deflateBound
  79#  define deflatePrime          z_deflatePrime
  80#  define inflateInit2_         z_inflateInit2_
  81#  define inflateSetDictionary  z_inflateSetDictionary
  82#  define inflateSync           z_inflateSync
  83#  define inflateSyncPoint      z_inflateSyncPoint
  84#  define inflateCopy           z_inflateCopy
  85#  define inflateReset          z_inflateReset
  86#  define inflateBack           z_inflateBack
  87#  define inflateBackEnd        z_inflateBackEnd
  88#  define compress              z_compress
  89#  define compress2             z_compress2
  90#  define compressBound         z_compressBound
  91#  define uncompress            z_uncompress
  92#  define adler32               z_adler32
  93#  define crc32                 z_crc32
  94#  define get_crc_table         z_get_crc_table
  95#  define zError                z_zError
  96
  97#  define alloc_func            z_alloc_func
  98#  define free_func             z_free_func
  99#  define in_func               z_in_func
 100#  define out_func              z_out_func
 101#  define Byte                  z_Byte
 102#  define uInt                  z_uInt
 103#  define uLong                 z_uLong
 104#  define Bytef                 z_Bytef
 105#  define charf                 z_charf
 106#  define intf                  z_intf
 107#  define uIntf                 z_uIntf
 108#  define uLongf                z_uLongf
 109#  define voidpf                z_voidpf
 110#  define voidp                 z_voidp
 111#endif
 112
 113#if defined(__MSDOS__) && !defined(MSDOS)
 114#  define MSDOS
 115#endif
 116#if (defined(OS_2) || defined(__OS2__)) && !defined(OS2)
 117#  define OS2
 118#endif
 119#if defined(_WINDOWS) && !defined(WINDOWS)
 120#  define WINDOWS
 121#endif
 122#if defined(_WIN32) || defined(_WIN32_WCE) || defined(__WIN32__)
 123#  ifndef WIN32
 124#    define WIN32
 125#  endif
 126#endif
 127#if (defined(MSDOS) || defined(OS2) || defined(WINDOWS)) && !defined(WIN32)
 128#  if !defined(__GNUC__) && !defined(__FLAT__) && !defined(__386__)
 129#    ifndef SYS16BIT
 130#      define SYS16BIT
 131#    endif
 132#  endif
 133#endif
 134
 135/*
 136 * Compile with -DMAXSEG_64K if the alloc function cannot allocate more
 137 * than 64k bytes at a time (needed on systems with 16-bit int).
 138 */
 139#ifdef SYS16BIT
 140#  define MAXSEG_64K
 141#endif
 142#ifdef MSDOS
 143#  define UNALIGNED_OK
 144#endif
 145
 146#ifdef __STDC_VERSION__
 147#  ifndef STDC
 148#    define STDC
 149#  endif
 150#  if __STDC_VERSION__ >= 199901L
 151#    ifndef STDC99
 152#      define STDC99
 153#    endif
 154#  endif
 155#endif
 156#if !defined(STDC) && (defined(__STDC__) || defined(__cplusplus))
 157#  define STDC
 158#endif
 159#if !defined(STDC) && (defined(__GNUC__) || defined(__BORLANDC__))
 160#  define STDC
 161#endif
 162#if !defined(STDC) && (defined(MSDOS) || defined(WINDOWS) || defined(WIN32))
 163#  define STDC
 164#endif
 165#if !defined(STDC) && (defined(OS2) || defined(__HOS_AIX__))
 166#  define STDC
 167#endif
 168
 169#if defined(__OS400__) && !defined(STDC)    /* iSeries (formerly AS/400). */
 170#  define STDC
 171#endif
 172
 173#ifndef STDC
 174#  ifndef const /* cannot use !defined(STDC) && !defined(const) on Mac */
 175#    define const       /* note: need a more gentle solution here */
 176#  endif
 177#endif
 178
 179/* Some Mac compilers merge all .h files incorrectly: */
 180#if defined(__MWERKS__)||defined(applec)||defined(THINK_C)||defined(__SC__)
 181#  define NO_DUMMY_DECL
 182#endif
 183
 184/* Maximum value for memLevel in deflateInit2 */
 185#ifndef MAX_MEM_LEVEL
 186#  ifdef MAXSEG_64K
 187#    define MAX_MEM_LEVEL 8
 188#  else
 189#    define MAX_MEM_LEVEL 9
 190#  endif
 191#endif
 192
 193/* Maximum value for windowBits in deflateInit2 and inflateInit2.
 194 * WARNING: reducing MAX_WBITS makes minigzip unable to extract .gz files
 195 * created by gzip. (Files created by minigzip can still be extracted by
 196 * gzip.)
 197 */
 198#ifndef MAX_WBITS
 199#  define MAX_WBITS   15 /* 32K LZ77 window */
 200#endif
 201
 202/* The memory requirements for deflate are (in bytes):
 203            (1 << (windowBits+2)) +  (1 << (memLevel+9))
 204 that is: 128K for windowBits=15  +  128K for memLevel = 8  (default values)
 205 plus a few kilobytes for small objects. For example, if you want to reduce
 206 the default memory requirements from 256K to 128K, compile with
 207     make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
 208 Of course this will generally degrade compression (there's no free lunch).
 209
 210   The memory requirements for inflate are (in bytes) 1 << windowBits
 211 that is, 32K for windowBits=15 (default value) plus a few kilobytes
 212 for small objects.
 213*/
 214
 215                        /* Type declarations */
 216
 217#ifndef OF /* function prototypes */
 218#  ifdef STDC
 219#    define OF(args)  args
 220#  else
 221#    define OF(args)  ()
 222#  endif
 223#endif
 224
 225/* The following definitions for FAR are needed only for MSDOS mixed
 226 * model programming (small or medium model with some far allocations).
 227 * This was tested only with MSC; for other MSDOS compilers you may have
 228 * to define NO_MEMCPY in zutil.h.  If you don't need the mixed model,
 229 * just define FAR to be empty.
 230 */
 231#ifdef SYS16BIT
 232#  if defined(M_I86SM) || defined(M_I86MM)
 233     /* MSC small or medium model */
 234#    define SMALL_MEDIUM
 235#    ifdef _MSC_VER
 236#      define FAR _far
 237#    else
 238#      define FAR far
 239#    endif
 240#  endif
 241#  if (defined(__SMALL__) || defined(__MEDIUM__))
 242     /* Turbo C small or medium model */
 243#    define SMALL_MEDIUM
 244#    ifdef __BORLANDC__
 245#      define FAR _far
 246#    else
 247#      define FAR far
 248#    endif
 249#  endif
 250#endif
 251
 252#if defined(WINDOWS) || defined(WIN32)
 253   /* If building or using zlib as a DLL, define ZLIB_DLL.
 254    * This is not mandatory, but it offers a little performance increase.
 255    */
 256#  ifdef ZLIB_DLL
 257#    if defined(WIN32) && (!defined(__BORLANDC__) || (__BORLANDC__ >= 0x500))
 258#      ifdef ZLIB_INTERNAL
 259#        define ZEXTERN extern __declspec(dllexport)
 260#      else
 261#        define ZEXTERN extern __declspec(dllimport)
 262#      endif
 263#    endif
 264#  endif  /* ZLIB_DLL */
 265   /* If building or using zlib with the WINAPI/WINAPIV calling convention,
 266    * define ZLIB_WINAPI.
 267    * Caution: the standard ZLIB1.DLL is NOT compiled using ZLIB_WINAPI.
 268    */
 269#  ifdef ZLIB_WINAPI
 270#    ifdef FAR
 271#      undef FAR
 272#    endif
 273#    include <windows.h>
 274     /* No need for _export, use ZLIB.DEF instead. */
 275     /* For complete Windows compatibility, use WINAPI, not __stdcall. */
 276#    define ZEXPORT WINAPI
 277#    ifdef WIN32
 278#      define ZEXPORTVA WINAPIV
 279#    else
 280#      define ZEXPORTVA FAR CDECL
 281#    endif
 282#  endif
 283#endif
 284
 285#if defined (__BEOS__)
 286#  ifdef ZLIB_DLL
 287#    ifdef ZLIB_INTERNAL
 288#      define ZEXPORT   __declspec(dllexport)
 289#      define ZEXPORTVA __declspec(dllexport)
 290#    else
 291#      define ZEXPORT   __declspec(dllimport)
 292#      define ZEXPORTVA __declspec(dllimport)
 293#    endif
 294#  endif
 295#endif
 296
 297#ifndef ZEXTERN
 298#  define ZEXTERN extern
 299#endif
 300#ifndef ZEXPORT
 301#  define ZEXPORT
 302#endif
 303#ifndef ZEXPORTVA
 304#  define ZEXPORTVA
 305#endif
 306
 307#ifndef FAR
 308#  define FAR
 309#endif
 310
 311#if !defined(__MACTYPES__)
 312typedef unsigned char  Byte;  /* 8 bits */
 313#endif
 314typedef unsigned int   uInt;  /* 16 bits or more */
 315typedef unsigned long  uLong; /* 32 bits or more */
 316
 317#ifdef SMALL_MEDIUM
 318   /* Borland C/C++ and some old MSC versions ignore FAR inside typedef */
 319#  define Bytef Byte FAR
 320#else
 321   typedef Byte  FAR Bytef;
 322#endif
 323typedef char  FAR charf;
 324typedef int   FAR intf;
 325typedef uInt  FAR uIntf;
 326typedef uLong FAR uLongf;
 327
 328#ifdef STDC
 329   typedef void const *voidpc;
 330   typedef void FAR   *voidpf;
 331   typedef void       *voidp;
 332#else
 333   typedef Byte const *voidpc;
 334   typedef Byte FAR   *voidpf;
 335   typedef Byte       *voidp;
 336#endif
 337
 338#  ifdef VMS
 339#    include <unixio.h>   /* for off_t */
 340#  endif
 341#  define z_off_t off_t
 342#ifndef SEEK_SET
 343#  define SEEK_SET        0       /* Seek from beginning of file.  */
 344#  define SEEK_CUR        1       /* Seek from current position.  */
 345#  define SEEK_END        2       /* Set file pointer to EOF plus "offset" */
 346#endif
 347#ifndef z_off_t
 348#  define z_off_t long
 349#endif
 350
 351#if defined(__OS400__)
 352#  define NO_vsnprintf
 353#endif
 354
 355#if defined(__MVS__)
 356#  define NO_vsnprintf
 357#  ifdef FAR
 358#    undef FAR
 359#  endif
 360#endif
 361
 362/* MVS linker does not support external names larger than 8 bytes */
 363#if defined(__MVS__)
 364#   pragma map(deflateInit_,"DEIN")
 365#   pragma map(deflateInit2_,"DEIN2")
 366#   pragma map(deflateEnd,"DEEND")
 367#   pragma map(deflateBound,"DEBND")
 368#   pragma map(inflateInit_,"ININ")
 369#   pragma map(inflateInit2_,"ININ2")
 370#   pragma map(inflateEnd,"INEND")
 371#   pragma map(inflateSync,"INSY")
 372#   pragma map(inflateSetDictionary,"INSEDI")
 373#   pragma map(compressBound,"CMBND")
 374#   pragma map(inflate_table,"INTABL")
 375#   pragma map(inflate_fast,"INFA")
 376#   pragma map(inflate_copyright,"INCOPY")
 377#endif
 378/* End of new zconf.h */
 379
 380/*
 381     The 'zlib' compression library provides in-memory compression and
 382  decompression functions, including integrity checks of the uncompressed
 383  data.  This version of the library supports only one compression method
 384  (deflation) but other algorithms will be added later and will have the same
 385  stream interface.
 386
 387     Compression can be done in a single step if the buffers are large
 388  enough (for example if an input file is mmap'ed), or can be done by
 389  repeated calls of the compression function.  In the latter case, the
 390  application must provide more input and/or consume the output
 391  (providing more output space) before each call.
 392
 393     The compressed data format used by default by the in-memory functions is
 394  the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped
 395  around a deflate stream, which is itself documented in RFC 1951.
 396
 397     The library also supports reading and writing files in gzip (.gz) format
 398  with an interface similar to that of stdio using the functions that start
 399  with "gz".  The gzip format is different from the zlib format.  gzip is a
 400  gzip wrapper, documented in RFC 1952, wrapped around a deflate stream.
 401
 402     This library can optionally read and write gzip streams in memory as well.
 403
 404     The zlib format was designed to be compact and fast for use in memory
 405  and on communications channels.  The gzip format was designed for single-
 406  file compression on file systems, has a larger header than zlib to maintain
 407  directory information, and uses a different, slower check method than zlib.
 408
 409     The library does not install any signal handler. The decoder checks
 410  the consistency of the compressed data, so the library should never
 411  crash even in case of corrupted input.
 412*/
 413
 414typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
 415typedef void   (*free_func)  OF((voidpf opaque, voidpf address, uInt size));
 416typedef void   (*cb_func)    OF((Bytef *buf, uInt len));
 417
 418struct internal_state;
 419
 420typedef struct z_stream_s {
 421        Bytef   *next_in; /* next input byte */
 422        uInt    avail_in; /* number of bytes available at next_in */
 423        uLong   total_in; /* total nb of input bytes read so far */
 424        Bytef   *next_out; /* next output byte should be put there */
 425        uInt    avail_out; /* remaining free space at next_out */
 426        uLong   total_out; /* total nb of bytes output so far */
 427        char    *msg;   /* last error message, NULL if no error */
 428        struct  internal_state FAR *state; /* not visible by applications */
 429        alloc_func      zalloc; /* used to allocate the internal state */
 430        free_func       zfree;  /* used to free the internal state */
 431        voidpf  opaque; /* private data object passed to zalloc and zfree */
 432        int     data_type;      /* best guess about the data type:
 433                                        binary or text */
 434        cb_func outcb;  /* called regularly just before blocks of output */
 435        uLong   adler;  /* adler32 value of the uncompressed data */
 436        uLong   reserved;       /* reserved for future use */
 437} z_stream;
 438
 439typedef z_stream FAR *z_streamp;
 440
 441/*
 442     gzip header information passed to and from zlib routines.  See RFC 1952
 443  for more details on the meanings of these fields.
 444*/
 445typedef struct gz_header_s {
 446        int     text;   /* true if compressed data believed to be text */
 447        uLong   time;   /* modification time */
 448        int     xflags; /* extra flags (not used when writing a gzip file) */
 449        int     os;     /* operating system */
 450        Bytef   *extra; /* pointer to extra field or Z_NULL if none */
 451        uInt    extra_len; /* extra field length (valid if extra != Z_NULL) */
 452        uInt    extra_max; /* space at extra (only when reading header) */
 453        Bytef   *name; /* pointer to zero-terminated file name or Z_NULL */
 454        uInt    name_max; /* space at name (only when reading header) */
 455        Bytef   *comment; /* pointer to zero-terminated comment or Z_NULL */
 456        uInt    comm_max; /* space at comment (only when reading header) */
 457        int     hcrc; /* true if there was or will be a header crc */
 458        int     done; /* true when done reading gzip header (not used
 459                        when writing a gzip file) */
 460} gz_header;
 461
 462typedef gz_header FAR *gz_headerp;
 463
 464                        /* constants */
 465#define Z_NO_FLUSH      0
 466#define Z_PARTIAL_FLUSH 1 /* will be removed, use Z_SYNC_FLUSH instead */
 467#define Z_SYNC_FLUSH    2
 468#define Z_FULL_FLUSH    3
 469#define Z_FINISH        4
 470#define Z_BLOCK         5
 471/* Allowed flush values; see deflate() and inflate() below for details */
 472
 473#define Z_OK            0
 474#define Z_STREAM_END    1
 475#define Z_NEED_DICT     2
 476#define Z_ERRNO        (-1)
 477#define Z_STREAM_ERROR (-2)
 478#define Z_DATA_ERROR   (-3)
 479#define Z_MEM_ERROR    (-4)
 480#define Z_BUF_ERROR    (-5)
 481#define Z_VERSION_ERROR (-6)
 482/* Return codes for the compression/decompression functions. Negative
 483 * values are errors, positive values are used for special but normal events.
 484 */
 485
 486#define Z_NO_COMPRESSION         0
 487#define Z_BEST_SPEED             1
 488#define Z_BEST_COMPRESSION       9
 489#define Z_DEFAULT_COMPRESSION  (-1)
 490/* compression levels */
 491
 492#define Z_FILTERED            1
 493#define Z_HUFFMAN_ONLY        2
 494#define Z_RLE                 3
 495#define Z_FIXED               4
 496#define Z_DEFAULT_STRATEGY    0
 497/* compression strategy; see deflateInit2() below for details */
 498
 499#define Z_BINARY   0
 500#define Z_TEXT     1
 501#define Z_ASCII    Z_TEXT   /* for compatibility with 1.2.2 and earlier */
 502#define Z_UNKNOWN  2
 503/* Possible values of the data_type field (though see inflate()) */
 504
 505#define Z_DEFLATED   8
 506/* The deflate compression method (the only one supported in this version) */
 507
 508#define Z_NULL  0  /* for initializing zalloc, zfree, opaque */
 509
 510                        /* basic functions */
 511
 512/* The application can compare zlibVersion and ZLIB_VERSION for consistency.
 513   If the first character differs, the library code actually used is
 514   not compatible with the zlib.h header file used by the application.
 515   This check is automatically made by deflateInit and inflateInit.
 516 */
 517
 518ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm, const char *version,
 519                                int stream_size));
 520
 521ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush));
 522/*
 523    inflate decompresses as much data as possible, and stops when the input
 524  buffer becomes empty or the output buffer becomes full. It may introduce
 525  some output latency (reading input without producing any output) except when
 526  forced to flush.
 527
 528  The detailed semantics are as follows. inflate performs one or both of the
 529  following actions:
 530
 531  - Decompress more input starting at next_in and update next_in and avail_in
 532    accordingly. If not all input can be processed (because there is not
 533    enough room in the output buffer), next_in is updated and processing
 534    will resume at this point for the next call of inflate().
 535
 536  - Provide more output starting at next_out and update next_out and avail_out
 537    accordingly.  inflate() provides as much output as possible, until there
 538    is no more input data or no more space in the output buffer (see below
 539    about the flush parameter).
 540
 541  Before the call of inflate(), the application should ensure that at least
 542  one of the actions is possible, by providing more input and/or consuming
 543  more output, and updating the next_* and avail_* values accordingly.
 544  The application can consume the uncompressed output when it wants, for
 545  example when the output buffer is full (avail_out == 0), or after each
 546  call of inflate(). If inflate returns Z_OK and with zero avail_out, it
 547  must be called again after making room in the output buffer because there
 548  might be more output pending.
 549
 550    The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH,
 551  Z_FINISH, or Z_BLOCK. Z_SYNC_FLUSH requests that inflate() flush as much
 552  output as possible to the output buffer. Z_BLOCK requests that inflate() stop
 553  if and when it gets to the next deflate block boundary. When decoding the
 554  zlib or gzip format, this will cause inflate() to return immediately after
 555  the header and before the first block. When doing a raw inflate, inflate()
 556  will go ahead and process the first block, and will return when it gets to
 557  the end of that block, or when it runs out of data.
 558
 559    The Z_BLOCK option assists in appending to or combining deflate streams.
 560  Also to assist in this, on return inflate() will set strm->data_type to the
 561  number of unused bits in the last byte taken from strm->next_in, plus 64
 562  if inflate() is currently decoding the last block in the deflate stream,
 563  plus 128 if inflate() returned immediately after decoding an end-of-block
 564  code or decoding the complete header up to just before the first byte of the
 565  deflate stream. The end-of-block will not be indicated until all of the
 566  uncompressed data from that block has been written to strm->next_out.  The
 567  number of unused bits may in general be greater than seven, except when
 568  bit 7 of data_type is set, in which case the number of unused bits will be
 569  less than eight.
 570
 571    inflate() should normally be called until it returns Z_STREAM_END or an
 572  error. However if all decompression is to be performed in a single step
 573  (a single call of inflate), the parameter flush should be set to
 574  Z_FINISH. In this case all pending input is processed and all pending
 575  output is flushed; avail_out must be large enough to hold all the
 576  uncompressed data. (The size of the uncompressed data may have been saved
 577  by the compressor for this purpose.) The next operation on this stream must
 578  be inflateEnd to deallocate the decompression state. The use of Z_FINISH
 579  is never required, but can be used to inform inflate that a faster approach
 580  may be used for the single inflate() call.
 581
 582     In this implementation, inflate() always flushes as much output as
 583  possible to the output buffer, and always uses the faster approach on the
 584  first call. So the only effect of the flush parameter in this implementation
 585  is on the return value of inflate(), as noted below, or when it returns early
 586  because Z_BLOCK is used.
 587
 588     If a preset dictionary is needed after this call (see inflateSetDictionary
 589  below), inflate sets strm->adler to the adler32 checksum of the dictionary
 590  chosen by the compressor and returns Z_NEED_DICT; otherwise it sets
 591  strm->adler to the adler32 checksum of all output produced so far (that is,
 592  total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described
 593  below. At the end of the stream, inflate() checks that its computed adler32
 594  checksum is equal to that saved by the compressor and returns Z_STREAM_END
 595  only if the checksum is correct.
 596
 597    inflate() will decompress and check either zlib-wrapped or gzip-wrapped
 598  deflate data.  The header type is detected automatically.  Any information
 599  contained in the gzip header is not retained, so applications that need that
 600  information should instead use raw inflate, see inflateInit2() below, or
 601  inflateBack() and perform their own processing of the gzip header and
 602  trailer.
 603
 604    inflate() returns Z_OK if some progress has been made (more input processed
 605  or more output produced), Z_STREAM_END if the end of the compressed data has
 606  been reached and all uncompressed output has been produced, Z_NEED_DICT if a
 607  preset dictionary is needed at this point, Z_DATA_ERROR if the input data was
 608  corrupted (input stream not conforming to the zlib format or incorrect check
 609  value), Z_STREAM_ERROR if the stream structure was inconsistent (for example
 610  if next_in or next_out was NULL), Z_MEM_ERROR if there was not enough memory,
 611  Z_BUF_ERROR if no progress is possible or if there was not enough room in the
 612  output buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and
 613  inflate() can be called again with more input and more output space to
 614  continue decompressing. If Z_DATA_ERROR is returned, the application may then
 615  call inflateSync() to look for a good compression block if a partial recovery
 616  of the data is desired.
 617*/
 618
 619ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm));
 620/*
 621     All dynamically allocated data structures for this stream are freed.
 622   This function discards any unprocessed input and does not flush any
 623   pending output.
 624
 625     inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state
 626   was inconsistent. In the error case, msg may be set but then points to a
 627   static string (which must not be deallocated).
 628*/
 629
 630                        /* Advanced functions */
 631
 632ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm));
 633
 634                        /* utility functions */
 635
 636/*
 637     The following utility functions are implemented on top of the
 638   basic stream-oriented functions. To simplify the interface, some
 639   default options are assumed (compression level and memory usage,
 640   standard memory allocation functions). The source code of these
 641   utility functions can easily be modified if you need special options.
 642*/
 643
 644ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
 645/*
 646     Update a running Adler-32 checksum with the bytes buf[0..len-1] and
 647   return the updated checksum. If buf is NULL, this function returns
 648   the required initial value for the checksum.
 649   An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
 650   much faster. Usage example:
 651
 652     uLong adler = adler32(0L, Z_NULL, 0);
 653
 654     while (read_buffer(buffer, length) != EOF) {
 655       adler = adler32(adler, buffer, length);
 656     }
 657     if (adler != original_adler) error();
 658*/
 659
 660/*
 661     Combine two Adler-32 checksums into one.  For two sequences of bytes, seq1
 662   and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for
 663   each, adler1 and adler2.  adler32_combine() returns the Adler-32 checksum of
 664   seq1 and seq2 concatenated, requiring only adler1, adler2, and len2.
 665*/
 666
 667ZEXTERN  uInt ZEXPORT crc32  OF((uInt crc, const Bytef *buf, uInt len));
 668/*
 669     Update a running CRC-32 with the bytes buf[0..len-1] and return the
 670   updated CRC-32. If buf is NULL, this function returns the required initial
 671   value for the for the crc. Pre- and post-conditioning (one's complement) is
 672   performed within this function so it shouldn't be done by the application.
 673   Usage example:
 674
 675     uLong crc = crc32(0L, Z_NULL, 0);
 676
 677     while (read_buffer(buffer, length) != EOF) {
 678       crc = crc32(crc, buffer, length);
 679     }
 680     if (crc != original_crc) error();
 681*/
 682
 683ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int  windowBits,
 684                                      const char *version, int stream_size));
 685#define inflateInit(strm) \
 686        inflateInit_((strm), ZLIB_VERSION, sizeof(z_stream))
 687#define inflateInit2(strm, windowBits) \
 688        inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))
 689
 690#if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL)
 691        struct internal_state {int dummy;}; /* hack for buggy compilers */
 692#endif
 693
 694#ifdef __cplusplus
 695}
 696#endif
 697
 698#endif /* ZLIB_H */
 699