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jzlib.h (39166B)

---

/* zlib.h -- interface of the 'zlib' general purpose compression library
 version 1.0.4, Jul 24th, 1996.

 Copyright (C) 1995-1996 Jean-loup Gailly and Mark Adler

 This software is provided 'as-is', without any express or implied
 warranty.  In no event will the authors be held liable for any damages
 arising from the use of this software.

 Permission is granted to anyone to use this software for any purpose,
 including commercial applications, and to alter it and redistribute it
 freely, subject to the following restrictions:

 1. The origin of this software must not be misrepresented; you must not
    claim that you wrote the original software. If you use this software
    in a product, an acknowledgment in the product documentation would be
    appreciated but is not required.
 2. Altered source versions must be plainly marked as such, and must not be
    misrepresented as being the original software.
 3. This notice may not be removed or altered from any source distribution.

 Jean-loup Gailly        Mark Adler
 gzip@prep.ai.mit.edu    madler@alumni.caltech.edu


 The data format used by the zlib library is described by RFCs (Request for
 Comments) 1950 to 1952 in the files ftp://ds.internic.net/rfc/rfc1950.txt
 (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format).
*/
/* This file was modified since it was taken from the zlib distribution */

#ifndef _ZLIB_H
#define _ZLIB_H

#ifdef __cplusplus
extern "C" {
#endif

#ifdef MOZILLA_CLIENT
#include "jzconf.h"
#else
#include "zconf.h"
#endif

#define ZLIB_VERSION "1.0.4"

/*
    The 'zlib' compression library provides in-memory compression and
 decompression functions, including integrity checks of the uncompressed
 data.  This version of the library supports only one compression method
 (deflation) but other algorithms may be added later and will have the same
 stream interface.

    For compression the application must provide the output buffer and
 may optionally provide the input buffer for optimization. For decompression,
 the application must provide the input buffer and may optionally provide
 the output buffer for optimization.

    Compression can be done in a single step if the buffers are large
 enough (for example if an input file is mmap'ed), or can be done by
 repeated calls of the compression function.  In the latter case, the
 application must provide more input and/or consume the output
 (providing more output space) before each call.

    The library does not install any signal handler. It is recommended to
 add at least a handler for SIGSEGV when decompressing; the library checks
 the consistency of the input data whenever possible but may go nuts
 for some forms of corrupted input.
*/

typedef voidpf(*alloc_func) OF((voidpf opaque, uInt items, uInt size));
typedef void(*free_func) OF((voidpf opaque, voidpf address));

struct internal_state;

typedef struct z_stream_s {
   Bytef *next_in; /* next input byte */
   uInt avail_in;  /* number of bytes available at next_in */
   uLong total_in; /* total nb of input bytes read so far */

   Bytef *next_out; /* next output byte should be put there */
   uInt avail_out;  /* remaining free space at next_out */
   uLong total_out; /* total nb of bytes output so far */

   char *msg;                        /* last error message, NULL if no error */
   struct internal_state FAR *state; /* not visible by applications */

   alloc_func zalloc; /* used to allocate the internal state */
   free_func zfree;   /* used to free the internal state */
   voidpf opaque;     /* private data object passed to zalloc and zfree */

   int data_type;  /* best guess about the data type: ascii or binary */
   uLong adler;    /* adler32 value of the uncompressed data */
   uLong reserved; /* reserved for future use */
} z_stream;

typedef z_stream FAR *z_streamp;

/*
  The application must update next_in and avail_in when avail_in has
  dropped to zero. It must update next_out and avail_out when avail_out
  has dropped to zero. The application must initialize zalloc, zfree and
  opaque before calling the init function. All other fields are set by the
  compression library and must not be updated by the application.

  The opaque value provided by the application will be passed as the first
  parameter for calls of zalloc and zfree. This can be useful for custom
  memory management. The compression library attaches no meaning to the
  opaque value.

  zalloc must return Z_NULL if there is not enough memory for the object.
  On 16-bit systems, the functions zalloc and zfree must be able to allocate
  exactly 65536 bytes, but will not be required to allocate more than this
  if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS,
  pointers returned by zalloc for objects of exactly 65536 bytes *must*
  have their offset normalized to zero. The default allocation function
  provided by this library ensures this (see zutil.c). To reduce memory
  requirements and avoid any allocation of 64K objects, at the expense of
  compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h).

  The fields total_in and total_out can be used for statistics or
  progress reports. After compression, total_in holds the total size of
  the uncompressed data and may be saved for use in the decompressor
  (particularly if the decompressor wants to decompress everything in
  a single step).
*/

/* constants */

#define Z_NO_FLUSH 0
#define Z_PARTIAL_FLUSH 1
#define Z_SYNC_FLUSH 2
#define Z_FULL_FLUSH 3
#define Z_FINISH 4
/* Allowed flush values; see deflate() below for details */

#define Z_OK 0
#define Z_STREAM_END 1
#define Z_NEED_DICT 2
#define Z_ERRNO (-1)
#define Z_STREAM_ERROR (-2)
#define Z_DATA_ERROR (-3)
#define Z_MEM_ERROR (-4)
#define Z_BUF_ERROR (-5)
#define Z_VERSION_ERROR (-6)
/* Return codes for the compression/decompression functions. Negative
* values are errors, positive values are used for special but normal events.
*/

#define Z_NO_COMPRESSION 0
#define Z_BEST_SPEED 1
#define Z_BEST_COMPRESSION 9
#define Z_DEFAULT_COMPRESSION (-1)
/* compression levels */

#define Z_FILTERED 1
#define Z_HUFFMAN_ONLY 2
#define Z_DEFAULT_STRATEGY 0
/* compression strategy; see deflateInit2() below for details */

#define Z_BINARY 0
#define Z_ASCII 1
#define Z_UNKNOWN 2
/* Possible values of the data_type field */

#define Z_DEFLATED 8
/* The deflate compression method (the only one supported in this version) */

#define Z_NULL 0 /* for initializing zalloc, zfree, opaque */

#define zlib_version zlibVersion()
/* for compatibility with versions < 1.0.2 */

/* basic functions */

#ifdef MOZILLA_CLIENT
PR_EXTERN(const char *)
zlibVersion(void);
#else
extern const char *EXPORT zlibVersion OF((void));
#endif
/* The application can compare zlibVersion and ZLIB_VERSION for consistency.
  If the first character differs, the library code actually used is
  not compatible with the zlib.h header file used by the application.
  This check is automatically made by deflateInit and inflateInit.
*/

/*
extern int EXPORT deflateInit OF((z_streamp strm, int level));

    Initializes the internal stream state for compression. The fields
  zalloc, zfree and opaque must be initialized before by the caller.
  If zalloc and zfree are set to Z_NULL, deflateInit updates them to
  use default allocation functions.

    The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9:
  1 gives best speed, 9 gives best compression, 0 gives no compression at
  all (the input data is simply copied a block at a time).
  Z_DEFAULT_COMPRESSION requests a default compromise between speed and
  compression (currently equivalent to level 6).

    deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
  enough memory, Z_STREAM_ERROR if level is not a valid compression level,
  Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible
  with the version assumed by the caller (ZLIB_VERSION).
  msg is set to null if there is no error message.  deflateInit does not
  perform any compression: this will be done by deflate().
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
deflate(z_streamp strm, int flush);
#else
extern int EXPORT deflate OF((z_streamp strm, int flush));
#endif
/*
 Performs one or both of the following actions:

 - Compress more input starting at next_in and update next_in and avail_in
   accordingly. If not all input can be processed (because there is not
   enough room in the output buffer), next_in and avail_in are updated and
   processing will resume at this point for the next call of deflate().

 - Provide more output starting at next_out and update next_out and avail_out
   accordingly. This action is forced if the parameter flush is non zero.
   Forcing flush frequently degrades the compression ratio, so this parameter
   should be set only when necessary (in interactive applications).
   Some output may be provided even if flush is not set.

 Before the call of deflate(), the application should ensure that at least
 one of the actions is possible, by providing more input and/or consuming
 more output, and updating avail_in or avail_out accordingly; avail_out
 should never be zero before the call. The application can consume the
 compressed output when it wants, for example when the output buffer is full
 (avail_out == 0), or after each call of deflate(). If deflate returns Z_OK
 and with zero avail_out, it must be called again after making room in the
 output buffer because there might be more output pending.

   If the parameter flush is set to Z_PARTIAL_FLUSH, the current compression
 block is terminated and flushed to the output buffer so that the
 decompressor can get all input data available so far. For method 9, a future
 variant on method 8, the current block will be flushed but not terminated.
 Z_SYNC_FLUSH has the same effect as partial flush except that the compressed
 output is byte aligned (the compressor can clear its internal bit buffer)
 and the current block is always terminated; this can be useful if the
 compressor has to be restarted from scratch after an interruption (in which
 case the internal state of the compressor may be lost).
   If flush is set to Z_FULL_FLUSH, the compression block is terminated, a
 special marker is output and the compression dictionary is discarded; this
 is useful to allow the decompressor to synchronize if one compressed block
 has been damaged (see inflateSync below).  Flushing degrades compression and
 so should be used only when necessary.  Using Z_FULL_FLUSH too often can
 seriously degrade the compression. If deflate returns with avail_out == 0,
 this function must be called again with the same value of the flush
 parameter and more output space (updated avail_out), until the flush is
 complete (deflate returns with non-zero avail_out).

   If the parameter flush is set to Z_FINISH, pending input is processed,
 pending output is flushed and deflate returns with Z_STREAM_END if there
 was enough output space; if deflate returns with Z_OK, this function must be
 called again with Z_FINISH and more output space (updated avail_out) but no
 more input data, until it returns with Z_STREAM_END or an error. After
 deflate has returned Z_STREAM_END, the only possible operations on the
 stream are deflateReset or deflateEnd.

   Z_FINISH can be used immediately after deflateInit if all the compression
 is to be done in a single step. In this case, avail_out must be at least
 0.1% larger than avail_in plus 12 bytes.  If deflate does not return
 Z_STREAM_END, then it must be called again as described above.

   deflate() may update data_type if it can make a good guess about
 the input data type (Z_ASCII or Z_BINARY). In doubt, the data is considered
 binary. This field is only for information purposes and does not affect
 the compression algorithm in any manner.

   deflate() returns Z_OK if some progress has been made (more input
 processed or more output produced), Z_STREAM_END if all input has been
 consumed and all output has been produced (only when flush is set to
 Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example
 if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible.
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
deflateEnd(z_streamp strm);
#else
extern int EXPORT deflateEnd OF((z_streamp strm));
#endif
/*
    All dynamically allocated data structures for this stream are freed.
  This function discards any unprocessed input and does not flush any
  pending output.

    deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the
  stream state was inconsistent, Z_DATA_ERROR if the stream was freed
  prematurely (some input or output was discarded). In the error case,
  msg may be set but then points to a static string (which must not be
  deallocated).
*/

/*
extern int EXPORT inflateInit OF((z_streamp strm));

    Initializes the internal stream state for decompression. The fields
  zalloc, zfree and opaque must be initialized before by the caller.  If
  zalloc and zfree are set to Z_NULL, inflateInit updates them to use default
  allocation functions.

    inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
  enough memory, Z_VERSION_ERROR if the zlib library version is incompatible
  with the version assumed by the caller.  msg is set to null if there is no
  error message. inflateInit does not perform any decompression: this will be
  done by inflate().
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
inflate(z_streamp strm, int flush);
#else
extern int EXPORT inflate OF((z_streamp strm, int flush));
#endif
/*
 Performs one or both of the following actions:

 - Decompress more input starting at next_in and update next_in and avail_in
   accordingly. If not all input can be processed (because there is not
   enough room in the output buffer), next_in is updated and processing
   will resume at this point for the next call of inflate().

 - Provide more output starting at next_out and update next_out and avail_out
   accordingly.  inflate() provides as much output as possible, until there
   is no more input data or no more space in the output buffer (see below
   about the flush parameter).

 Before the call of inflate(), the application should ensure that at least
 one of the actions is possible, by providing more input and/or consuming
 more output, and updating the next_* and avail_* values accordingly.
 The application can consume the uncompressed output when it wants, for
 example when the output buffer is full (avail_out == 0), or after each
 call of inflate(). If inflate returns Z_OK and with zero avail_out, it
 must be called again after making room in the output buffer because there
 might be more output pending.

   If the parameter flush is set to Z_PARTIAL_FLUSH, inflate flushes as much
 output as possible to the output buffer. The flushing behavior of inflate is
 not specified for values of the flush parameter other than Z_PARTIAL_FLUSH
 and Z_FINISH, but the current implementation actually flushes as much output
 as possible anyway.

   inflate() should normally be called until it returns Z_STREAM_END or an
 error. However if all decompression is to be performed in a single step
 (a single call of inflate), the parameter flush should be set to
 Z_FINISH. In this case all pending input is processed and all pending
 output is flushed; avail_out must be large enough to hold all the
 uncompressed data. (The size of the uncompressed data may have been saved
 by the compressor for this purpose.) The next operation on this stream must
 be inflateEnd to deallocate the decompression state. The use of Z_FINISH
 is never required, but can be used to inform inflate that a faster routine
 may be used for the single inflate() call.

   inflate() returns Z_OK if some progress has been made (more input
 processed or more output produced), Z_STREAM_END if the end of the
 compressed data has been reached and all uncompressed output has been
 produced, Z_NEED_DICT if a preset dictionary is needed at this point (see
 inflateSetDictionary below), Z_DATA_ERROR if the input data was corrupted,
 Z_STREAM_ERROR if the stream structure was inconsistent (for example if
 next_in or next_out was NULL), Z_MEM_ERROR if there was not enough memory,
 Z_BUF_ERROR if no progress is possible or if there was not enough room in
 the output buffer when Z_FINISH is used. In the Z_DATA_ERROR case, the
 application may then call inflateSync to look for a good compression block.
 In the Z_NEED_DICT case, strm->adler is set to the Adler32 value of the
 dictionary chosen by the compressor.
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
inflateEnd(z_streamp strm);
#else
extern int EXPORT inflateEnd OF((z_streamp strm));
#endif
/*
    All dynamically allocated data structures for this stream are freed.
  This function discards any unprocessed input and does not flush any
  pending output.

    inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state
  was inconsistent. In the error case, msg may be set but then points to a
  static string (which must not be deallocated).
*/

/* Advanced functions */

/*
   The following functions are needed only in some special applications.
*/

/*
extern int EXPORT deflateInit2 OF((z_streamp strm,
                                  int  level,
                                  int  method,
                                  int  windowBits,
                                  int  memLevel,
                                  int  strategy));

    This is another version of deflateInit with more compression options. The
  fields next_in, zalloc, zfree and opaque must be initialized before by
  the caller.

    The method parameter is the compression method. It must be Z_DEFLATED in
  this version of the library. (Method 9 will allow a 64K history buffer and
  partial block flushes.)

    The windowBits parameter is the base two logarithm of the window size
  (the size of the history buffer).  It should be in the range 8..15 for this
  version of the library (the value 16 will be allowed for method 9). Larger
  values of this parameter result in better compression at the expense of
  memory usage. The default value is 15 if deflateInit is used instead.

    The memLevel parameter specifies how much memory should be allocated
  for the internal compression state. memLevel=1 uses minimum memory but
  is slow and reduces compression ratio; memLevel=9 uses maximum memory
  for optimal speed. The default value is 8. See zconf.h for total memory
  usage as a function of windowBits and memLevel.

    The strategy parameter is used to tune the compression algorithm. Use the
  value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a
  filter (or predictor), or Z_HUFFMAN_ONLY to force Huffman encoding only (no
  string match).  Filtered data consists mostly of small values with a
  somewhat random distribution. In this case, the compression algorithm is
  tuned to compress them better. The effect of Z_FILTERED is to force more
  Huffman coding and less string matching; it is somewhat intermediate
  between Z_DEFAULT and Z_HUFFMAN_ONLY. The strategy parameter only affects
  the compression ratio but not the correctness of the compressed output even
  if it is not set appropriately.

    If next_in is not null, the library will use this buffer to hold also
  some history information; the buffer must either hold the entire input
  data, or have at least 1<<(windowBits+1) bytes and be writable. If next_in
  is null, the library will allocate its own history buffer (and leave next_in
  null). next_out need not be provided here but must be provided by the
  application for the next call of deflate().

    If the history buffer is provided by the application, next_in must
  must never be changed by the application since the compressor maintains
  information inside this buffer from call to call; the application
  must provide more input only by increasing avail_in. next_in is always
  reset by the library in this case.

     deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
  not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
  an invalid method). msg is set to null if there is no error message.
  deflateInit2 does not perform any compression: this will be done by
  deflate().
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
deflateSetDictionary(z_streamp strm,
                    const Bytef *dictionary,
                    uInt dictLength);
#else
extern int EXPORT deflateSetDictionary OF((z_streamp strm,
                                          const Bytef *dictionary,
                                          uInt dictLength));
#endif
/*
    Initializes the compression dictionary (history buffer) from the given
  byte sequence without producing any compressed output. This function must
  be called immediately after deflateInit or deflateInit2, before any call
  of deflate. The compressor and decompressor must use exactly the same
  dictionary (see inflateSetDictionary).
    The dictionary should consist of strings (byte sequences) that are likely
  to be encountered later in the data to be compressed, with the most commonly
  used strings preferably put towards the end of the dictionary. Using a
  dictionary is most useful when the data to be compressed is short and
  can be predicted with good accuracy; the data can then be compressed better
  than with the default empty dictionary. In this version of the library,
  only the last 32K bytes of the dictionary are used.
    Upon return of this function, strm->adler is set to the Adler32 value
  of the dictionary; the decompressor may later use this value to determine
  which dictionary has been used by the compressor. (The Adler32 value
  applies to the whole dictionary even if only a subset of the dictionary is
  actually used by the compressor.)

    deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a
  parameter is invalid (such as NULL dictionary) or the stream state
  is inconsistent (for example if deflate has already been called for this
  stream). deflateSetDictionary does not perform any compression: this will
  be done by deflate().
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
deflateCopy(z_streamp dest, z_streamp source);
#else
extern int EXPORT deflateCopy OF((z_streamp dest, z_streamp source));
#endif
/*
    Sets the destination stream as a complete copy of the source stream.  If
  the source stream is using an application-supplied history buffer, a new
  buffer is allocated for the destination stream.  The compressed output
  buffer is always application-supplied. It's the responsibility of the
  application to provide the correct values of next_out and avail_out for the
  next call of deflate.

    This function can be useful when several compression strategies will be
  tried, for example when there are several ways of pre-processing the input
  data with a filter. The streams that will be discarded should then be freed
  by calling deflateEnd.  Note that deflateCopy duplicates the internal
  compression state which can be quite large, so this strategy is slow and
  can consume lots of memory.

    deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
  enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
  (such as zalloc being NULL). msg is left unchanged in both source and
  destination.
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
deflateReset(z_streamp strm);
#else
extern int EXPORT deflateReset OF((z_streamp strm));
#endif
/*
    This function is equivalent to deflateEnd followed by deflateInit,
  but does not free and reallocate all the internal compression state.
  The stream will keep the same compression level and any other attributes
  that may have been set by deflateInit2.

     deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
  stream state was inconsistent (such as zalloc or state being NULL).
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
deflateParams(z_streamp strm, int level, int strategy);
#else
extern int EXPORT deflateParams OF((z_streamp strm, int level, int strategy));
#endif
/*
    Dynamically update the compression level and compression strategy.
  This can be used to switch between compression and straight copy of
  the input data, or to switch to a different kind of input data requiring
  a different strategy. If the compression level is changed, the input
  available so far is compressed with the old level (and may be flushed);
  the new level will take effect only at the next call of deflate().

    Before the call of deflateParams, the stream state must be set as for
  a call of deflate(), since the currently available input may have to
  be compressed and flushed. In particular, strm->avail_out must be non-zero.

    deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source
  stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR
  if strm->avail_out was zero.
*/

/*
extern int EXPORT inflateInit2 OF((z_streamp strm,
                                  int  windowBits));

    This is another version of inflateInit with more compression options. The
  fields next_out, zalloc, zfree and opaque must be initialized before by
  the caller.

    The windowBits parameter is the base two logarithm of the maximum window
  size (the size of the history buffer).  It should be in the range 8..15 for
  this version of the library (the value 16 will be allowed soon). The
  default value is 15 if inflateInit is used instead. If a compressed stream
  with a larger window size is given as input, inflate() will return with
  the error code Z_DATA_ERROR instead of trying to allocate a larger window.

    If next_out is not null, the library will use this buffer for the history
  buffer; the buffer must either be large enough to hold the entire output
  data, or have at least 1<<windowBits bytes.  If next_out is null, the
  library will allocate its own buffer (and leave next_out null). next_in
  need not be provided here but must be provided by the application for the
  next call of inflate().

    If the history buffer is provided by the application, next_out must
  never be changed by the application since the decompressor maintains
  history information inside this buffer from call to call; the application
  can only reset next_out to the beginning of the history buffer when
  avail_out is zero and all output has been consumed.

     inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
  not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
  windowBits < 8). msg is set to null if there is no error message.
  inflateInit2 does not perform any decompression: this will be done by
  inflate().
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
inflateSetDictionary(z_streamp strm,
                    const Bytef *dictionary,
                    uInt dictLength);
#else
extern int EXPORT inflateSetDictionary OF((z_streamp strm,
                                          const Bytef *dictionary,
                                          uInt dictLength));
#endif
/*
    Initializes the decompression dictionary (history buffer) from the given
  uncompressed byte sequence. This function must be called immediately after
  a call of inflate if this call returned Z_NEED_DICT. The dictionary chosen
  by the compressor can be determined from the Adler32 value returned by this
  call of inflate. The compressor and decompressor must use exactly the same
  dictionary (see deflateSetDictionary).

    inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
  parameter is invalid (such as NULL dictionary) or the stream state is
  inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the
  expected one (incorrect Adler32 value). inflateSetDictionary does not
  perform any decompression: this will be done by subsequent calls of
  inflate().
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
inflateSync(z_streamp strm);
#else
extern int EXPORT inflateSync OF((z_streamp strm));
#endif
/*
   Skips invalid compressed data until the special marker (see deflate()
 above) can be found, or until all available input is skipped. No output
 is provided.

   inflateSync returns Z_OK if the special marker has been found, Z_BUF_ERROR
 if no more input was provided, Z_DATA_ERROR if no marker has been found,
 or Z_STREAM_ERROR if the stream structure was inconsistent. In the success
 case, the application may save the current current value of total_in which
 indicates where valid compressed data was found. In the error case, the
 application may repeatedly call inflateSync, providing more input each time,
 until success or end of the input data.
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
inflateReset(z_streamp strm);
#else
extern int EXPORT inflateReset OF((z_streamp strm));
#endif
/*
    This function is equivalent to inflateEnd followed by inflateInit,
  but does not free and reallocate all the internal decompression state.
  The stream will keep attributes that may have been set by inflateInit2.

     inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
  stream state was inconsistent (such as zalloc or state being NULL).
*/

/* utility functions */

/*
    The following utility functions are implemented on top of the
  basic stream-oriented functions. To simplify the interface, some
  default options are assumed (compression level, window size,
  standard memory allocation functions). The source code of these
  utility functions can easily be modified if you need special options.
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
compress(Bytef *dest, uLongf *destLen,
        const Bytef *source, uLong sourceLen);
#else
extern int EXPORT compress OF((Bytef * dest, uLongf *destLen,
                              const Bytef *source, uLong sourceLen));
#endif
/*
    Compresses the source buffer into the destination buffer.  sourceLen is
  the byte length of the source buffer. Upon entry, destLen is the total
  size of the destination buffer, which must be at least 0.1% larger than
  sourceLen plus 12 bytes. Upon exit, destLen is the actual size of the
  compressed buffer.
    This function can be used to compress a whole file at once if the
  input file is mmap'ed.
    compress returns Z_OK if success, Z_MEM_ERROR if there was not
  enough memory, Z_BUF_ERROR if there was not enough room in the output
  buffer.
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
uncompress(Bytef *dest, uLongf *destLen,
          const Bytef *source, uLong sourceLen);
#else
extern int EXPORT uncompress OF((Bytef * dest, uLongf *destLen,
                                const Bytef *source, uLong sourceLen));
#endif
/*
    Decompresses the source buffer into the destination buffer.  sourceLen is
  the byte length of the source buffer. Upon entry, destLen is the total
  size of the destination buffer, which must be large enough to hold the
  entire uncompressed data. (The size of the uncompressed data must have
  been saved previously by the compressor and transmitted to the decompressor
  by some mechanism outside the scope of this compression library.)
  Upon exit, destLen is the actual size of the compressed buffer.
    This function can be used to decompress a whole file at once if the
  input file is mmap'ed.

    uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
  enough memory, Z_BUF_ERROR if there was not enough room in the output
  buffer, or Z_DATA_ERROR if the input data was corrupted.
*/

typedef voidp gzFile;

#ifdef MOZILLA_CLIENT
PR_EXTERN(gzFile)
gzopen(const char *path, const char *mode);
#else
extern gzFile EXPORT gzopen OF((const char *path, const char *mode));
#endif
/*
    Opens a gzip (.gz) file for reading or writing. The mode parameter
  is as in fopen ("rb" or "wb") but can also include a compression level
  ("wb9").  gzopen can be used to read a file which is not in gzip format;
  in this case gzread will directly read from the file without decompression.
    gzopen returns NULL if the file could not be opened or if there was
  insufficient memory to allocate the (de)compression state; errno
  can be checked to distinguish the two cases (if errno is zero, the
  zlib error is Z_MEM_ERROR).
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(gzFile)
gzdopen(int fd, const char *mode);
#else
extern gzFile EXPORT gzdopen OF((int fd, const char *mode));
#endif
/*
    gzdopen() associates a gzFile with the file descriptor fd.  File
  descriptors are obtained from calls like open, dup, creat, pipe or
  fileno (in the file has been previously opened with fopen).
  The mode parameter is as in gzopen.
    The next call of gzclose on the returned gzFile will also close the
  file descriptor fd, just like fclose(fdopen(fd), mode) closes the file
  descriptor fd. If you want to keep fd open, use gzdopen(dup(fd), mode).
    gzdopen returns NULL if there was insufficient memory to allocate
  the (de)compression state.
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
gzread(gzFile file, voidp buf, unsigned len);
#else
extern int EXPORT gzread OF((gzFile file, voidp buf, unsigned len));
#endif
/*
    Reads the given number of uncompressed bytes from the compressed file.
  If the input file was not in gzip format, gzread copies the given number
  of bytes into the buffer.
    gzread returns the number of uncompressed bytes actually read (0 for
  end of file, -1 for error). */

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
gzwrite(gzFile file, const voidp buf, unsigned len);
#else
extern int EXPORT gzwrite OF((gzFile file, const voidp buf, unsigned len));
#endif
/*
    Writes the given number of uncompressed bytes into the compressed file.
  gzwrite returns the number of uncompressed bytes actually written
  (0 in case of error).
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
gzflush(gzFile file, int flush);
#else
extern int EXPORT gzflush OF((gzFile file, int flush));
#endif
/*
    Flushes all pending output into the compressed file. The parameter
  flush is as in the deflate() function. The return value is the zlib
  error number (see function gzerror below). gzflush returns Z_OK if
  the flush parameter is Z_FINISH and all output could be flushed.
    gzflush should be called only when strictly necessary because it can
  degrade compression.
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
gzclose(gzFile file);
#else
extern int EXPORT gzclose OF((gzFile file));
#endif
/*
    Flushes all pending output if necessary, closes the compressed file
  and deallocates all the (de)compression state. The return value is the zlib
  error number (see function gzerror below).
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(const char *)
gzerror(gzFile file, int *errnum);
#else
extern const char *EXPORT gzerror OF((gzFile file, int *errnum));
#endif
/*
    Returns the error message for the last error which occurred on the
  given compressed file. errnum is set to zlib error number. If an
  error occurred in the file system and not in the compression library,
  errnum is set to Z_ERRNO and the application may consult errno
  to get the exact error code.
*/

/* checksum functions */

/*
    These functions are not related to compression but are exported
  anyway because they might be useful in applications using the
  compression library.
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(uLong)
adler32(uLong adler, const Bytef *buf, uInt len);
#else
extern uLong EXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
#endif

/*
    Update a running Adler-32 checksum with the bytes buf[0..len-1] and
  return the updated checksum. If buf is NULL, this function returns
  the required initial value for the checksum.
  An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
  much faster. Usage example:

    uLong adler = adler32(0L, Z_NULL, 0);

    while (read_buffer(buffer, length) != EOF) {
      adler = adler32(adler, buffer, length);
    }
    if (adler != original_adler) error();
*/

#ifdef MOZILLA_CLIENT
PR_EXTERN(uLong)
crc32(uLong crc, const Bytef *buf, uInt len);
#else
extern uLong EXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len));
#endif
/*
    Update a running crc with the bytes buf[0..len-1] and return the updated
  crc. If buf is NULL, this function returns the required initial value
  for the crc. Pre- and post-conditioning (one's complement) is performed
  within this function so it shouldn't be done by the application.
  Usage example:

    uLong crc = crc32(0L, Z_NULL, 0);

    while (read_buffer(buffer, length) != EOF) {
      crc = crc32(crc, buffer, length);
    }
    if (crc != original_crc) error();
*/

/* various hacks, don't look :) */

/* deflateInit and inflateInit are macros to allow checking the zlib version
* and the compiler's view of z_stream:
*/
#ifdef MOZILLA_CLIENT
PR_EXTERN(int)
deflateInit(z_streamp strm, int level, const char *version,
           int stream_size);
PR_EXTERN(int)
inflateInit_(z_streamp strm, const char *version,
            int stream_size);
PR_EXTERN(int)
deflateInit2_(z_streamp strm, int level, int method,
             int windowBits, int memLevel, int strategy,
             const char *version, int stream_size);
PR_EXTERN(int)
inflateInit2_(z_streamp strm, int windowBits,
             const char *version, int stream_size);
#else
extern int EXPORT deflateInit_ OF((z_streamp strm, int level, const char *version,
                                  int stream_size));
extern int EXPORT inflateInit_ OF((z_streamp strm, const char *version,
                                  int stream_size));
extern int EXPORT deflateInit2_ OF((z_streamp strm, int level, int method,
                                   int windowBits, int memLevel, int strategy,
                                   const char *version, int stream_size));
extern int EXPORT inflateInit2_ OF((z_streamp strm, int windowBits,
                                   const char *version, int stream_size));
#endif /* MOZILLA_CLIENT */

#define deflateInit(strm, level) \
   deflateInit_((strm), (level), ZLIB_VERSION, sizeof(z_stream))
#define inflateInit(strm) \
   inflateInit_((strm), ZLIB_VERSION, sizeof(z_stream))
#define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
   deflateInit2_((strm), (level), (method), (windowBits), (memLevel),    \
                 (strategy), ZLIB_VERSION, sizeof(z_stream))
#define inflateInit2(strm, windowBits) \
   inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))

#if !defined(_Z_UTIL_H) && !defined(NO_DUMMY_DECL)
struct internal_state {
   int dummy;
}; /* hack for buggy compilers */
#endif

uLongf *get_crc_table OF((void)); /* can be used by asm versions of crc32() */

#ifdef __cplusplus
}
#endif

#endif /* _ZLIB_H */