nuclear@1: /* zlib.h -- interface of the 'zlib' general purpose compression library nuclear@1: version 1.2.3, July 18th, 2005 nuclear@1: nuclear@1: Copyright (C) 1995-2005 Jean-loup Gailly and Mark Adler nuclear@1: nuclear@1: This software is provided 'as-is', without any express or implied nuclear@1: warranty. In no event will the authors be held liable for any damages nuclear@1: arising from the use of this software. nuclear@1: nuclear@1: Permission is granted to anyone to use this software for any purpose, nuclear@1: including commercial applications, and to alter it and redistribute it nuclear@1: freely, subject to the following restrictions: nuclear@1: nuclear@1: 1. The origin of this software must not be misrepresented; you must not nuclear@1: claim that you wrote the original software. If you use this software nuclear@1: in a product, an acknowledgment in the product documentation would be nuclear@1: appreciated but is not required. nuclear@1: 2. Altered source versions must be plainly marked as such, and must not be nuclear@1: misrepresented as being the original software. nuclear@1: 3. This notice may not be removed or altered from any source distribution. nuclear@1: nuclear@1: Jean-loup Gailly Mark Adler nuclear@1: jloup@gzip.org madler@alumni.caltech.edu nuclear@1: nuclear@1: nuclear@1: The data format used by the zlib library is described by RFCs (Request for nuclear@1: Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt nuclear@1: (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format). nuclear@1: */ nuclear@1: nuclear@1: #ifndef ZLIB_H nuclear@1: #define ZLIB_H nuclear@1: nuclear@1: #include "zconf.h" nuclear@1: nuclear@1: #ifdef __cplusplus nuclear@1: extern "C" { nuclear@1: #endif nuclear@1: nuclear@1: #define ZLIB_VERSION "1.2.3" nuclear@1: #define ZLIB_VERNUM 0x1230 nuclear@1: nuclear@1: /* nuclear@1: The 'zlib' compression library provides in-memory compression and nuclear@1: decompression functions, including integrity checks of the uncompressed nuclear@1: data. This version of the library supports only one compression method nuclear@1: (deflation) but other algorithms will be added later and will have the same nuclear@1: stream interface. nuclear@1: nuclear@1: Compression can be done in a single step if the buffers are large nuclear@1: enough (for example if an input file is mmap'ed), or can be done by nuclear@1: repeated calls of the compression function. In the latter case, the nuclear@1: application must provide more input and/or consume the output nuclear@1: (providing more output space) before each call. nuclear@1: nuclear@1: The compressed data format used by default by the in-memory functions is nuclear@1: the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped nuclear@1: around a deflate stream, which is itself documented in RFC 1951. nuclear@1: nuclear@1: The library also supports reading and writing files in gzip (.gz) format nuclear@1: with an interface similar to that of stdio using the functions that start nuclear@1: with "gz". The gzip format is different from the zlib format. gzip is a nuclear@1: gzip wrapper, documented in RFC 1952, wrapped around a deflate stream. nuclear@1: nuclear@1: This library can optionally read and write gzip streams in memory as well. nuclear@1: nuclear@1: The zlib format was designed to be compact and fast for use in memory nuclear@1: and on communications channels. The gzip format was designed for single- nuclear@1: file compression on file systems, has a larger header than zlib to maintain nuclear@1: directory information, and uses a different, slower check method than zlib. nuclear@1: nuclear@1: The library does not install any signal handler. The decoder checks nuclear@1: the consistency of the compressed data, so the library should never nuclear@1: crash even in case of corrupted input. nuclear@1: */ nuclear@1: nuclear@1: typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size)); nuclear@1: typedef void (*free_func) OF((voidpf opaque, voidpf address)); nuclear@1: nuclear@1: struct internal_state; nuclear@1: nuclear@1: typedef struct z_stream_s { nuclear@1: Bytef *next_in; /* next input byte */ nuclear@1: uInt avail_in; /* number of bytes available at next_in */ nuclear@1: uLong total_in; /* total nb of input bytes read so far */ nuclear@1: nuclear@1: Bytef *next_out; /* next output byte should be put there */ nuclear@1: uInt avail_out; /* remaining free space at next_out */ nuclear@1: uLong total_out; /* total nb of bytes output so far */ nuclear@1: nuclear@1: char *msg; /* last error message, NULL if no error */ nuclear@1: struct internal_state FAR *state; /* not visible by applications */ nuclear@1: nuclear@1: alloc_func zalloc; /* used to allocate the internal state */ nuclear@1: free_func zfree; /* used to free the internal state */ nuclear@1: voidpf opaque; /* private data object passed to zalloc and zfree */ nuclear@1: nuclear@1: int data_type; /* best guess about the data type: binary or text */ nuclear@1: uLong adler; /* adler32 value of the uncompressed data */ nuclear@1: uLong reserved; /* reserved for future use */ nuclear@1: } z_stream; nuclear@1: nuclear@1: typedef z_stream FAR *z_streamp; nuclear@1: nuclear@1: /* nuclear@1: gzip header information passed to and from zlib routines. See RFC 1952 nuclear@1: for more details on the meanings of these fields. nuclear@1: */ nuclear@1: typedef struct gz_header_s { nuclear@1: int text; /* true if compressed data believed to be text */ nuclear@1: uLong time; /* modification time */ nuclear@1: int xflags; /* extra flags (not used when writing a gzip file) */ nuclear@1: int os; /* operating system */ nuclear@1: Bytef *extra; /* pointer to extra field or Z_NULL if none */ nuclear@1: uInt extra_len; /* extra field length (valid if extra != Z_NULL) */ nuclear@1: uInt extra_max; /* space at extra (only when reading header) */ nuclear@1: Bytef *name; /* pointer to zero-terminated file name or Z_NULL */ nuclear@1: uInt name_max; /* space at name (only when reading header) */ nuclear@1: Bytef *comment; /* pointer to zero-terminated comment or Z_NULL */ nuclear@1: uInt comm_max; /* space at comment (only when reading header) */ nuclear@1: int hcrc; /* true if there was or will be a header crc */ nuclear@1: int done; /* true when done reading gzip header (not used nuclear@1: when writing a gzip file) */ nuclear@1: } gz_header; nuclear@1: nuclear@1: typedef gz_header FAR *gz_headerp; nuclear@1: nuclear@1: /* nuclear@1: The application must update next_in and avail_in when avail_in has nuclear@1: dropped to zero. It must update next_out and avail_out when avail_out nuclear@1: has dropped to zero. The application must initialize zalloc, zfree and nuclear@1: opaque before calling the init function. All other fields are set by the nuclear@1: compression library and must not be updated by the application. nuclear@1: nuclear@1: The opaque value provided by the application will be passed as the first nuclear@1: parameter for calls of zalloc and zfree. This can be useful for custom nuclear@1: memory management. The compression library attaches no meaning to the nuclear@1: opaque value. nuclear@1: nuclear@1: zalloc must return Z_NULL if there is not enough memory for the object. nuclear@1: If zlib is used in a multi-threaded application, zalloc and zfree must be nuclear@1: thread safe. nuclear@1: nuclear@1: On 16-bit systems, the functions zalloc and zfree must be able to allocate nuclear@1: exactly 65536 bytes, but will not be required to allocate more than this nuclear@1: if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS, nuclear@1: pointers returned by zalloc for objects of exactly 65536 bytes *must* nuclear@1: have their offset normalized to zero. The default allocation function nuclear@1: provided by this library ensures this (see zutil.c). To reduce memory nuclear@1: requirements and avoid any allocation of 64K objects, at the expense of nuclear@1: compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h). nuclear@1: nuclear@1: The fields total_in and total_out can be used for statistics or nuclear@1: progress reports. After compression, total_in holds the total size of nuclear@1: the uncompressed data and may be saved for use in the decompressor nuclear@1: (particularly if the decompressor wants to decompress everything in nuclear@1: a single step). nuclear@1: */ nuclear@1: nuclear@1: /* constants */ nuclear@1: nuclear@1: #define Z_NO_FLUSH 0 nuclear@1: #define Z_PARTIAL_FLUSH 1 /* will be removed, use Z_SYNC_FLUSH instead */ nuclear@1: #define Z_SYNC_FLUSH 2 nuclear@1: #define Z_FULL_FLUSH 3 nuclear@1: #define Z_FINISH 4 nuclear@1: #define Z_BLOCK 5 nuclear@1: /* Allowed flush values; see deflate() and inflate() below for details */ nuclear@1: nuclear@1: #define Z_OK 0 nuclear@1: #define Z_STREAM_END 1 nuclear@1: #define Z_NEED_DICT 2 nuclear@1: #define Z_ERRNO (-1) nuclear@1: #define Z_STREAM_ERROR (-2) nuclear@1: #define Z_DATA_ERROR (-3) nuclear@1: #define Z_MEM_ERROR (-4) nuclear@1: #define Z_BUF_ERROR (-5) nuclear@1: #define Z_VERSION_ERROR (-6) nuclear@1: /* Return codes for the compression/decompression functions. Negative nuclear@1: * values are errors, positive values are used for special but normal events. nuclear@1: */ nuclear@1: nuclear@1: #define Z_NO_COMPRESSION 0 nuclear@1: #define Z_BEST_SPEED 1 nuclear@1: #define Z_BEST_COMPRESSION 9 nuclear@1: #define Z_DEFAULT_COMPRESSION (-1) nuclear@1: /* compression levels */ nuclear@1: nuclear@1: #define Z_FILTERED 1 nuclear@1: #define Z_HUFFMAN_ONLY 2 nuclear@1: #define Z_RLE 3 nuclear@1: #define Z_FIXED 4 nuclear@1: #define Z_DEFAULT_STRATEGY 0 nuclear@1: /* compression strategy; see deflateInit2() below for details */ nuclear@1: nuclear@1: #define Z_BINARY 0 nuclear@1: #define Z_TEXT 1 nuclear@1: #define Z_ASCII Z_TEXT /* for compatibility with 1.2.2 and earlier */ nuclear@1: #define Z_UNKNOWN 2 nuclear@1: /* Possible values of the data_type field (though see inflate()) */ nuclear@1: nuclear@1: #define Z_DEFLATED 8 nuclear@1: /* The deflate compression method (the only one supported in this version) */ nuclear@1: nuclear@1: #define Z_NULL 0 /* for initializing zalloc, zfree, opaque */ nuclear@1: nuclear@1: #define zlib_version zlibVersion() nuclear@1: /* for compatibility with versions < 1.0.2 */ nuclear@1: nuclear@1: /* basic functions */ nuclear@1: nuclear@1: ZEXTERN const char * ZEXPORT zlibVersion OF((void)); nuclear@1: /* The application can compare zlibVersion and ZLIB_VERSION for consistency. nuclear@1: If the first character differs, the library code actually used is nuclear@1: not compatible with the zlib.h header file used by the application. nuclear@1: This check is automatically made by deflateInit and inflateInit. nuclear@1: */ nuclear@1: nuclear@1: /* nuclear@1: ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level)); nuclear@1: nuclear@1: Initializes the internal stream state for compression. The fields nuclear@1: zalloc, zfree and opaque must be initialized before by the caller. nuclear@1: If zalloc and zfree are set to Z_NULL, deflateInit updates them to nuclear@1: use default allocation functions. nuclear@1: nuclear@1: The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9: nuclear@1: 1 gives best speed, 9 gives best compression, 0 gives no compression at nuclear@1: all (the input data is simply copied a block at a time). nuclear@1: Z_DEFAULT_COMPRESSION requests a default compromise between speed and nuclear@1: compression (currently equivalent to level 6). nuclear@1: nuclear@1: deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not nuclear@1: enough memory, Z_STREAM_ERROR if level is not a valid compression level, nuclear@1: Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible nuclear@1: with the version assumed by the caller (ZLIB_VERSION). nuclear@1: msg is set to null if there is no error message. deflateInit does not nuclear@1: perform any compression: this will be done by deflate(). nuclear@1: */ nuclear@1: nuclear@1: nuclear@1: ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush)); nuclear@1: /* nuclear@1: deflate compresses as much data as possible, and stops when the input nuclear@1: buffer becomes empty or the output buffer becomes full. It may introduce some nuclear@1: output latency (reading input without producing any output) except when nuclear@1: forced to flush. nuclear@1: nuclear@1: The detailed semantics are as follows. deflate performs one or both of the nuclear@1: following actions: nuclear@1: nuclear@1: - Compress more input starting at next_in and update next_in and avail_in nuclear@1: accordingly. If not all input can be processed (because there is not nuclear@1: enough room in the output buffer), next_in and avail_in are updated and nuclear@1: processing will resume at this point for the next call of deflate(). nuclear@1: nuclear@1: - Provide more output starting at next_out and update next_out and avail_out nuclear@1: accordingly. This action is forced if the parameter flush is non zero. nuclear@1: Forcing flush frequently degrades the compression ratio, so this parameter nuclear@1: should be set only when necessary (in interactive applications). nuclear@1: Some output may be provided even if flush is not set. nuclear@1: nuclear@1: Before the call of deflate(), the application should ensure that at least nuclear@1: one of the actions is possible, by providing more input and/or consuming nuclear@1: more output, and updating avail_in or avail_out accordingly; avail_out nuclear@1: should never be zero before the call. The application can consume the nuclear@1: compressed output when it wants, for example when the output buffer is full nuclear@1: (avail_out == 0), or after each call of deflate(). If deflate returns Z_OK nuclear@1: and with zero avail_out, it must be called again after making room in the nuclear@1: output buffer because there might be more output pending. nuclear@1: nuclear@1: Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to nuclear@1: decide how much data to accumualte before producing output, in order to nuclear@1: maximize compression. nuclear@1: nuclear@1: If the parameter flush is set to Z_SYNC_FLUSH, all pending output is nuclear@1: flushed to the output buffer and the output is aligned on a byte boundary, so nuclear@1: that the decompressor can get all input data available so far. (In particular nuclear@1: avail_in is zero after the call if enough output space has been provided nuclear@1: before the call.) Flushing may degrade compression for some compression nuclear@1: algorithms and so it should be used only when necessary. nuclear@1: nuclear@1: If flush is set to Z_FULL_FLUSH, all output is flushed as with nuclear@1: Z_SYNC_FLUSH, and the compression state is reset so that decompression can nuclear@1: restart from this point if previous compressed data has been damaged or if nuclear@1: random access is desired. Using Z_FULL_FLUSH too often can seriously degrade nuclear@1: compression. nuclear@1: nuclear@1: If deflate returns with avail_out == 0, this function must be called again nuclear@1: with the same value of the flush parameter and more output space (updated nuclear@1: avail_out), until the flush is complete (deflate returns with non-zero nuclear@1: avail_out). In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that nuclear@1: avail_out is greater than six to avoid repeated flush markers due to nuclear@1: avail_out == 0 on return. nuclear@1: nuclear@1: If the parameter flush is set to Z_FINISH, pending input is processed, nuclear@1: pending output is flushed and deflate returns with Z_STREAM_END if there nuclear@1: was enough output space; if deflate returns with Z_OK, this function must be nuclear@1: called again with Z_FINISH and more output space (updated avail_out) but no nuclear@1: more input data, until it returns with Z_STREAM_END or an error. After nuclear@1: deflate has returned Z_STREAM_END, the only possible operations on the nuclear@1: stream are deflateReset or deflateEnd. nuclear@1: nuclear@1: Z_FINISH can be used immediately after deflateInit if all the compression nuclear@1: is to be done in a single step. In this case, avail_out must be at least nuclear@1: the value returned by deflateBound (see below). If deflate does not return nuclear@1: Z_STREAM_END, then it must be called again as described above. nuclear@1: nuclear@1: deflate() sets strm->adler to the adler32 checksum of all input read nuclear@1: so far (that is, total_in bytes). nuclear@1: nuclear@1: deflate() may update strm->data_type if it can make a good guess about nuclear@1: the input data type (Z_BINARY or Z_TEXT). In doubt, the data is considered nuclear@1: binary. This field is only for information purposes and does not affect nuclear@1: the compression algorithm in any manner. nuclear@1: nuclear@1: deflate() returns Z_OK if some progress has been made (more input nuclear@1: processed or more output produced), Z_STREAM_END if all input has been nuclear@1: consumed and all output has been produced (only when flush is set to nuclear@1: Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example nuclear@1: if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible nuclear@1: (for example avail_in or avail_out was zero). Note that Z_BUF_ERROR is not nuclear@1: fatal, and deflate() can be called again with more input and more output nuclear@1: space to continue compressing. nuclear@1: */ nuclear@1: nuclear@1: nuclear@1: ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm)); nuclear@1: /* nuclear@1: All dynamically allocated data structures for this stream are freed. nuclear@1: This function discards any unprocessed input and does not flush any nuclear@1: pending output. nuclear@1: nuclear@1: deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the nuclear@1: stream state was inconsistent, Z_DATA_ERROR if the stream was freed nuclear@1: prematurely (some input or output was discarded). In the error case, nuclear@1: msg may be set but then points to a static string (which must not be nuclear@1: deallocated). nuclear@1: */ nuclear@1: nuclear@1: nuclear@1: /* nuclear@1: ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm)); nuclear@1: nuclear@1: Initializes the internal stream state for decompression. The fields nuclear@1: next_in, avail_in, zalloc, zfree and opaque must be initialized before by nuclear@1: the caller. If next_in is not Z_NULL and avail_in is large enough (the exact nuclear@1: value depends on the compression method), inflateInit determines the nuclear@1: compression method from the zlib header and allocates all data structures nuclear@1: accordingly; otherwise the allocation will be deferred to the first call of nuclear@1: inflate. If zalloc and zfree are set to Z_NULL, inflateInit updates them to nuclear@1: use default allocation functions. nuclear@1: nuclear@1: inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough nuclear@1: memory, Z_VERSION_ERROR if the zlib library version is incompatible with the nuclear@1: version assumed by the caller. msg is set to null if there is no error nuclear@1: message. inflateInit does not perform any decompression apart from reading nuclear@1: the zlib header if present: this will be done by inflate(). (So next_in and nuclear@1: avail_in may be modified, but next_out and avail_out are unchanged.) nuclear@1: */ nuclear@1: nuclear@1: nuclear@1: ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush)); nuclear@1: /* nuclear@1: inflate decompresses as much data as possible, and stops when the input nuclear@1: buffer becomes empty or the output buffer becomes full. It may introduce nuclear@1: some output latency (reading input without producing any output) except when nuclear@1: forced to flush. nuclear@1: nuclear@1: The detailed semantics are as follows. inflate performs one or both of the nuclear@1: following actions: nuclear@1: nuclear@1: - Decompress more input starting at next_in and update next_in and avail_in nuclear@1: accordingly. If not all input can be processed (because there is not nuclear@1: enough room in the output buffer), next_in is updated and processing nuclear@1: will resume at this point for the next call of inflate(). nuclear@1: nuclear@1: - Provide more output starting at next_out and update next_out and avail_out nuclear@1: accordingly. inflate() provides as much output as possible, until there nuclear@1: is no more input data or no more space in the output buffer (see below nuclear@1: about the flush parameter). nuclear@1: nuclear@1: Before the call of inflate(), the application should ensure that at least nuclear@1: one of the actions is possible, by providing more input and/or consuming nuclear@1: more output, and updating the next_* and avail_* values accordingly. nuclear@1: The application can consume the uncompressed output when it wants, for nuclear@1: example when the output buffer is full (avail_out == 0), or after each nuclear@1: call of inflate(). If inflate returns Z_OK and with zero avail_out, it nuclear@1: must be called again after making room in the output buffer because there nuclear@1: might be more output pending. nuclear@1: nuclear@1: The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH, nuclear@1: Z_FINISH, or Z_BLOCK. Z_SYNC_FLUSH requests that inflate() flush as much nuclear@1: output as possible to the output buffer. Z_BLOCK requests that inflate() stop nuclear@1: if and when it gets to the next deflate block boundary. When decoding the nuclear@1: zlib or gzip format, this will cause inflate() to return immediately after nuclear@1: the header and before the first block. When doing a raw inflate, inflate() nuclear@1: will go ahead and process the first block, and will return when it gets to nuclear@1: the end of that block, or when it runs out of data. nuclear@1: nuclear@1: The Z_BLOCK option assists in appending to or combining deflate streams. nuclear@1: Also to assist in this, on return inflate() will set strm->data_type to the nuclear@1: number of unused bits in the last byte taken from strm->next_in, plus 64 nuclear@1: if inflate() is currently decoding the last block in the deflate stream, nuclear@1: plus 128 if inflate() returned immediately after decoding an end-of-block nuclear@1: code or decoding the complete header up to just before the first byte of the nuclear@1: deflate stream. The end-of-block will not be indicated until all of the nuclear@1: uncompressed data from that block has been written to strm->next_out. The nuclear@1: number of unused bits may in general be greater than seven, except when nuclear@1: bit 7 of data_type is set, in which case the number of unused bits will be nuclear@1: less than eight. nuclear@1: nuclear@1: inflate() should normally be called until it returns Z_STREAM_END or an nuclear@1: error. However if all decompression is to be performed in a single step nuclear@1: (a single call of inflate), the parameter flush should be set to nuclear@1: Z_FINISH. In this case all pending input is processed and all pending nuclear@1: output is flushed; avail_out must be large enough to hold all the nuclear@1: uncompressed data. (The size of the uncompressed data may have been saved nuclear@1: by the compressor for this purpose.) The next operation on this stream must nuclear@1: be inflateEnd to deallocate the decompression state. The use of Z_FINISH nuclear@1: is never required, but can be used to inform inflate that a faster approach nuclear@1: may be used for the single inflate() call. nuclear@1: nuclear@1: In this implementation, inflate() always flushes as much output as nuclear@1: possible to the output buffer, and always uses the faster approach on the nuclear@1: first call. So the only effect of the flush parameter in this implementation nuclear@1: is on the return value of inflate(), as noted below, or when it returns early nuclear@1: because Z_BLOCK is used. nuclear@1: nuclear@1: If a preset dictionary is needed after this call (see inflateSetDictionary nuclear@1: below), inflate sets strm->adler to the adler32 checksum of the dictionary nuclear@1: chosen by the compressor and returns Z_NEED_DICT; otherwise it sets nuclear@1: strm->adler to the adler32 checksum of all output produced so far (that is, nuclear@1: total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described nuclear@1: below. At the end of the stream, inflate() checks that its computed adler32 nuclear@1: checksum is equal to that saved by the compressor and returns Z_STREAM_END nuclear@1: only if the checksum is correct. nuclear@1: nuclear@1: inflate() will decompress and check either zlib-wrapped or gzip-wrapped nuclear@1: deflate data. The header type is detected automatically. Any information nuclear@1: contained in the gzip header is not retained, so applications that need that nuclear@1: information should instead use raw inflate, see inflateInit2() below, or nuclear@1: inflateBack() and perform their own processing of the gzip header and nuclear@1: trailer. nuclear@1: nuclear@1: inflate() returns Z_OK if some progress has been made (more input processed nuclear@1: or more output produced), Z_STREAM_END if the end of the compressed data has nuclear@1: been reached and all uncompressed output has been produced, Z_NEED_DICT if a nuclear@1: preset dictionary is needed at this point, Z_DATA_ERROR if the input data was nuclear@1: corrupted (input stream not conforming to the zlib format or incorrect check nuclear@1: value), Z_STREAM_ERROR if the stream structure was inconsistent (for example nuclear@1: if next_in or next_out was NULL), Z_MEM_ERROR if there was not enough memory, nuclear@1: Z_BUF_ERROR if no progress is possible or if there was not enough room in the nuclear@1: output buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and nuclear@1: inflate() can be called again with more input and more output space to nuclear@1: continue decompressing. If Z_DATA_ERROR is returned, the application may then nuclear@1: call inflateSync() to look for a good compression block if a partial recovery nuclear@1: of the data is desired. nuclear@1: */ nuclear@1: nuclear@1: nuclear@1: ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm)); nuclear@1: /* nuclear@1: All dynamically allocated data structures for this stream are freed. nuclear@1: This function discards any unprocessed input and does not flush any nuclear@1: pending output. nuclear@1: nuclear@1: inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state nuclear@1: was inconsistent. In the error case, msg may be set but then points to a nuclear@1: static string (which must not be deallocated). nuclear@1: */ nuclear@1: nuclear@1: /* Advanced functions */ nuclear@1: nuclear@1: /* nuclear@1: The following functions are needed only in some special applications. nuclear@1: */ nuclear@1: nuclear@1: /* nuclear@1: ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm, nuclear@1: int level, nuclear@1: int method, nuclear@1: int windowBits, nuclear@1: int memLevel, nuclear@1: int strategy)); nuclear@1: nuclear@1: This is another version of deflateInit with more compression options. The nuclear@1: fields next_in, zalloc, zfree and opaque must be initialized before by nuclear@1: the caller. nuclear@1: nuclear@1: The method parameter is the compression method. It must be Z_DEFLATED in nuclear@1: this version of the library. nuclear@1: nuclear@1: The windowBits parameter is the base two logarithm of the window size nuclear@1: (the size of the history buffer). It should be in the range 8..15 for this nuclear@1: version of the library. Larger values of this parameter result in better nuclear@1: compression at the expense of memory usage. The default value is 15 if nuclear@1: deflateInit is used instead. nuclear@1: nuclear@1: windowBits can also be -8..-15 for raw deflate. In this case, -windowBits nuclear@1: determines the window size. deflate() will then generate raw deflate data nuclear@1: with no zlib header or trailer, and will not compute an adler32 check value. nuclear@1: nuclear@1: windowBits can also be greater than 15 for optional gzip encoding. Add nuclear@1: 16 to windowBits to write a simple gzip header and trailer around the nuclear@1: compressed data instead of a zlib wrapper. The gzip header will have no nuclear@1: file name, no extra data, no comment, no modification time (set to zero), nuclear@1: no header crc, and the operating system will be set to 255 (unknown). If a nuclear@1: gzip stream is being written, strm->adler is a crc32 instead of an adler32. nuclear@1: nuclear@1: The memLevel parameter specifies how much memory should be allocated nuclear@1: for the internal compression state. memLevel=1 uses minimum memory but nuclear@1: is slow and reduces compression ratio; memLevel=9 uses maximum memory nuclear@1: for optimal speed. The default value is 8. See zconf.h for total memory nuclear@1: usage as a function of windowBits and memLevel. nuclear@1: nuclear@1: The strategy parameter is used to tune the compression algorithm. Use the nuclear@1: value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a nuclear@1: filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no nuclear@1: string match), or Z_RLE to limit match distances to one (run-length nuclear@1: encoding). Filtered data consists mostly of small values with a somewhat nuclear@1: random distribution. In this case, the compression algorithm is tuned to nuclear@1: compress them better. The effect of Z_FILTERED is to force more Huffman nuclear@1: coding and less string matching; it is somewhat intermediate between nuclear@1: Z_DEFAULT and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as fast as nuclear@1: Z_HUFFMAN_ONLY, but give better compression for PNG image data. The strategy nuclear@1: parameter only affects the compression ratio but not the correctness of the nuclear@1: compressed output even if it is not set appropriately. Z_FIXED prevents the nuclear@1: use of dynamic Huffman codes, allowing for a simpler decoder for special nuclear@1: applications. nuclear@1: nuclear@1: deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough nuclear@1: memory, Z_STREAM_ERROR if a parameter is invalid (such as an invalid nuclear@1: method). msg is set to null if there is no error message. deflateInit2 does nuclear@1: not perform any compression: this will be done by deflate(). nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm, nuclear@1: const Bytef *dictionary, nuclear@1: uInt dictLength)); nuclear@1: /* nuclear@1: Initializes the compression dictionary from the given byte sequence nuclear@1: without producing any compressed output. This function must be called nuclear@1: immediately after deflateInit, deflateInit2 or deflateReset, before any nuclear@1: call of deflate. The compressor and decompressor must use exactly the same nuclear@1: dictionary (see inflateSetDictionary). nuclear@1: nuclear@1: The dictionary should consist of strings (byte sequences) that are likely nuclear@1: to be encountered later in the data to be compressed, with the most commonly nuclear@1: used strings preferably put towards the end of the dictionary. Using a nuclear@1: dictionary is most useful when the data to be compressed is short and can be nuclear@1: predicted with good accuracy; the data can then be compressed better than nuclear@1: with the default empty dictionary. nuclear@1: nuclear@1: Depending on the size of the compression data structures selected by nuclear@1: deflateInit or deflateInit2, a part of the dictionary may in effect be nuclear@1: discarded, for example if the dictionary is larger than the window size in nuclear@1: deflate or deflate2. Thus the strings most likely to be useful should be nuclear@1: put at the end of the dictionary, not at the front. In addition, the nuclear@1: current implementation of deflate will use at most the window size minus nuclear@1: 262 bytes of the provided dictionary. nuclear@1: nuclear@1: Upon return of this function, strm->adler is set to the adler32 value nuclear@1: of the dictionary; the decompressor may later use this value to determine nuclear@1: which dictionary has been used by the compressor. (The adler32 value nuclear@1: applies to the whole dictionary even if only a subset of the dictionary is nuclear@1: actually used by the compressor.) If a raw deflate was requested, then the nuclear@1: adler32 value is not computed and strm->adler is not set. nuclear@1: nuclear@1: deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a nuclear@1: parameter is invalid (such as NULL dictionary) or the stream state is nuclear@1: inconsistent (for example if deflate has already been called for this stream nuclear@1: or if the compression method is bsort). deflateSetDictionary does not nuclear@1: perform any compression: this will be done by deflate(). nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest, nuclear@1: z_streamp source)); nuclear@1: /* nuclear@1: Sets the destination stream as a complete copy of the source stream. nuclear@1: nuclear@1: This function can be useful when several compression strategies will be nuclear@1: tried, for example when there are several ways of pre-processing the input nuclear@1: data with a filter. The streams that will be discarded should then be freed nuclear@1: by calling deflateEnd. Note that deflateCopy duplicates the internal nuclear@1: compression state which can be quite large, so this strategy is slow and nuclear@1: can consume lots of memory. nuclear@1: nuclear@1: deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not nuclear@1: enough memory, Z_STREAM_ERROR if the source stream state was inconsistent nuclear@1: (such as zalloc being NULL). msg is left unchanged in both source and nuclear@1: destination. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm)); nuclear@1: /* nuclear@1: This function is equivalent to deflateEnd followed by deflateInit, nuclear@1: but does not free and reallocate all the internal compression state. nuclear@1: The stream will keep the same compression level and any other attributes nuclear@1: that may have been set by deflateInit2. nuclear@1: nuclear@1: deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source nuclear@1: stream state was inconsistent (such as zalloc or state being NULL). nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm, nuclear@1: int level, nuclear@1: int strategy)); nuclear@1: /* nuclear@1: Dynamically update the compression level and compression strategy. The nuclear@1: interpretation of level and strategy is as in deflateInit2. This can be nuclear@1: used to switch between compression and straight copy of the input data, or nuclear@1: to switch to a different kind of input data requiring a different nuclear@1: strategy. If the compression level is changed, the input available so far nuclear@1: is compressed with the old level (and may be flushed); the new level will nuclear@1: take effect only at the next call of deflate(). nuclear@1: nuclear@1: Before the call of deflateParams, the stream state must be set as for nuclear@1: a call of deflate(), since the currently available input may have to nuclear@1: be compressed and flushed. In particular, strm->avail_out must be non-zero. nuclear@1: nuclear@1: deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source nuclear@1: stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR nuclear@1: if strm->avail_out was zero. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm, nuclear@1: int good_length, nuclear@1: int max_lazy, nuclear@1: int nice_length, nuclear@1: int max_chain)); nuclear@1: /* nuclear@1: Fine tune deflate's internal compression parameters. This should only be nuclear@1: used by someone who understands the algorithm used by zlib's deflate for nuclear@1: searching for the best matching string, and even then only by the most nuclear@1: fanatic optimizer trying to squeeze out the last compressed bit for their nuclear@1: specific input data. Read the deflate.c source code for the meaning of the nuclear@1: max_lazy, good_length, nice_length, and max_chain parameters. nuclear@1: nuclear@1: deflateTune() can be called after deflateInit() or deflateInit2(), and nuclear@1: returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm, nuclear@1: uLong sourceLen)); nuclear@1: /* nuclear@1: deflateBound() returns an upper bound on the compressed size after nuclear@1: deflation of sourceLen bytes. It must be called after deflateInit() nuclear@1: or deflateInit2(). This would be used to allocate an output buffer nuclear@1: for deflation in a single pass, and so would be called before deflate(). nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm, nuclear@1: int bits, nuclear@1: int value)); nuclear@1: /* nuclear@1: deflatePrime() inserts bits in the deflate output stream. The intent nuclear@1: is that this function is used to start off the deflate output with the nuclear@1: bits leftover from a previous deflate stream when appending to it. As such, nuclear@1: this function can only be used for raw deflate, and must be used before the nuclear@1: first deflate() call after a deflateInit2() or deflateReset(). bits must be nuclear@1: less than or equal to 16, and that many of the least significant bits of nuclear@1: value will be inserted in the output. nuclear@1: nuclear@1: deflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source nuclear@1: stream state was inconsistent. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm, nuclear@1: gz_headerp head)); nuclear@1: /* nuclear@1: deflateSetHeader() provides gzip header information for when a gzip nuclear@1: stream is requested by deflateInit2(). deflateSetHeader() may be called nuclear@1: after deflateInit2() or deflateReset() and before the first call of nuclear@1: deflate(). The text, time, os, extra field, name, and comment information nuclear@1: in the provided gz_header structure are written to the gzip header (xflag is nuclear@1: ignored -- the extra flags are set according to the compression level). The nuclear@1: caller must assure that, if not Z_NULL, name and comment are terminated with nuclear@1: a zero byte, and that if extra is not Z_NULL, that extra_len bytes are nuclear@1: available there. If hcrc is true, a gzip header crc is included. Note that nuclear@1: the current versions of the command-line version of gzip (up through version nuclear@1: 1.3.x) do not support header crc's, and will report that it is a "multi-part nuclear@1: gzip file" and give up. nuclear@1: nuclear@1: If deflateSetHeader is not used, the default gzip header has text false, nuclear@1: the time set to zero, and os set to 255, with no extra, name, or comment nuclear@1: fields. The gzip header is returned to the default state by deflateReset(). nuclear@1: nuclear@1: deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source nuclear@1: stream state was inconsistent. nuclear@1: */ nuclear@1: nuclear@1: /* nuclear@1: ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm, nuclear@1: int windowBits)); nuclear@1: nuclear@1: This is another version of inflateInit with an extra parameter. The nuclear@1: fields next_in, avail_in, zalloc, zfree and opaque must be initialized nuclear@1: before by the caller. nuclear@1: nuclear@1: The windowBits parameter is the base two logarithm of the maximum window nuclear@1: size (the size of the history buffer). It should be in the range 8..15 for nuclear@1: this version of the library. The default value is 15 if inflateInit is used nuclear@1: instead. windowBits must be greater than or equal to the windowBits value nuclear@1: provided to deflateInit2() while compressing, or it must be equal to 15 if nuclear@1: deflateInit2() was not used. If a compressed stream with a larger window nuclear@1: size is given as input, inflate() will return with the error code nuclear@1: Z_DATA_ERROR instead of trying to allocate a larger window. nuclear@1: nuclear@1: windowBits can also be -8..-15 for raw inflate. In this case, -windowBits nuclear@1: determines the window size. inflate() will then process raw deflate data, nuclear@1: not looking for a zlib or gzip header, not generating a check value, and not nuclear@1: looking for any check values for comparison at the end of the stream. This nuclear@1: is for use with other formats that use the deflate compressed data format nuclear@1: such as zip. Those formats provide their own check values. If a custom nuclear@1: format is developed using the raw deflate format for compressed data, it is nuclear@1: recommended that a check value such as an adler32 or a crc32 be applied to nuclear@1: the uncompressed data as is done in the zlib, gzip, and zip formats. For nuclear@1: most applications, the zlib format should be used as is. Note that comments nuclear@1: above on the use in deflateInit2() applies to the magnitude of windowBits. nuclear@1: nuclear@1: windowBits can also be greater than 15 for optional gzip decoding. Add nuclear@1: 32 to windowBits to enable zlib and gzip decoding with automatic header nuclear@1: detection, or add 16 to decode only the gzip format (the zlib format will nuclear@1: return a Z_DATA_ERROR). If a gzip stream is being decoded, strm->adler is nuclear@1: a crc32 instead of an adler32. nuclear@1: nuclear@1: inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough nuclear@1: memory, Z_STREAM_ERROR if a parameter is invalid (such as a null strm). msg nuclear@1: is set to null if there is no error message. inflateInit2 does not perform nuclear@1: any decompression apart from reading the zlib header if present: this will nuclear@1: be done by inflate(). (So next_in and avail_in may be modified, but next_out nuclear@1: and avail_out are unchanged.) nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm, nuclear@1: const Bytef *dictionary, nuclear@1: uInt dictLength)); nuclear@1: /* nuclear@1: Initializes the decompression dictionary from the given uncompressed byte nuclear@1: sequence. This function must be called immediately after a call of inflate, nuclear@1: if that call returned Z_NEED_DICT. The dictionary chosen by the compressor nuclear@1: can be determined from the adler32 value returned by that call of inflate. nuclear@1: The compressor and decompressor must use exactly the same dictionary (see nuclear@1: deflateSetDictionary). For raw inflate, this function can be called nuclear@1: immediately after inflateInit2() or inflateReset() and before any call of nuclear@1: inflate() to set the dictionary. The application must insure that the nuclear@1: dictionary that was used for compression is provided. nuclear@1: nuclear@1: inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a nuclear@1: parameter is invalid (such as NULL dictionary) or the stream state is nuclear@1: inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the nuclear@1: expected one (incorrect adler32 value). inflateSetDictionary does not nuclear@1: perform any decompression: this will be done by subsequent calls of nuclear@1: inflate(). nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm)); nuclear@1: /* nuclear@1: Skips invalid compressed data until a full flush point (see above the nuclear@1: description of deflate with Z_FULL_FLUSH) can be found, or until all nuclear@1: available input is skipped. No output is provided. nuclear@1: nuclear@1: inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR nuclear@1: if no more input was provided, Z_DATA_ERROR if no flush point has been found, nuclear@1: or Z_STREAM_ERROR if the stream structure was inconsistent. In the success nuclear@1: case, the application may save the current current value of total_in which nuclear@1: indicates where valid compressed data was found. In the error case, the nuclear@1: application may repeatedly call inflateSync, providing more input each time, nuclear@1: until success or end of the input data. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest, nuclear@1: z_streamp source)); nuclear@1: /* nuclear@1: Sets the destination stream as a complete copy of the source stream. nuclear@1: nuclear@1: This function can be useful when randomly accessing a large stream. The nuclear@1: first pass through the stream can periodically record the inflate state, nuclear@1: allowing restarting inflate at those points when randomly accessing the nuclear@1: stream. nuclear@1: nuclear@1: inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not nuclear@1: enough memory, Z_STREAM_ERROR if the source stream state was inconsistent nuclear@1: (such as zalloc being NULL). msg is left unchanged in both source and nuclear@1: destination. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm)); nuclear@1: /* nuclear@1: This function is equivalent to inflateEnd followed by inflateInit, nuclear@1: but does not free and reallocate all the internal decompression state. nuclear@1: The stream will keep attributes that may have been set by inflateInit2. nuclear@1: nuclear@1: inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source nuclear@1: stream state was inconsistent (such as zalloc or state being NULL). nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm, nuclear@1: int bits, nuclear@1: int value)); nuclear@1: /* nuclear@1: This function inserts bits in the inflate input stream. The intent is nuclear@1: that this function is used to start inflating at a bit position in the nuclear@1: middle of a byte. The provided bits will be used before any bytes are used nuclear@1: from next_in. This function should only be used with raw inflate, and nuclear@1: should be used before the first inflate() call after inflateInit2() or nuclear@1: inflateReset(). bits must be less than or equal to 16, and that many of the nuclear@1: least significant bits of value will be inserted in the input. nuclear@1: nuclear@1: inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source nuclear@1: stream state was inconsistent. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm, nuclear@1: gz_headerp head)); nuclear@1: /* nuclear@1: inflateGetHeader() requests that gzip header information be stored in the nuclear@1: provided gz_header structure. inflateGetHeader() may be called after nuclear@1: inflateInit2() or inflateReset(), and before the first call of inflate(). nuclear@1: As inflate() processes the gzip stream, head->done is zero until the header nuclear@1: is completed, at which time head->done is set to one. If a zlib stream is nuclear@1: being decoded, then head->done is set to -1 to indicate that there will be nuclear@1: no gzip header information forthcoming. Note that Z_BLOCK can be used to nuclear@1: force inflate() to return immediately after header processing is complete nuclear@1: and before any actual data is decompressed. nuclear@1: nuclear@1: The text, time, xflags, and os fields are filled in with the gzip header nuclear@1: contents. hcrc is set to true if there is a header CRC. (The header CRC nuclear@1: was valid if done is set to one.) If extra is not Z_NULL, then extra_max nuclear@1: contains the maximum number of bytes to write to extra. Once done is true, nuclear@1: extra_len contains the actual extra field length, and extra contains the nuclear@1: extra field, or that field truncated if extra_max is less than extra_len. nuclear@1: If name is not Z_NULL, then up to name_max characters are written there, nuclear@1: terminated with a zero unless the length is greater than name_max. If nuclear@1: comment is not Z_NULL, then up to comm_max characters are written there, nuclear@1: terminated with a zero unless the length is greater than comm_max. When nuclear@1: any of extra, name, or comment are not Z_NULL and the respective field is nuclear@1: not present in the header, then that field is set to Z_NULL to signal its nuclear@1: absence. This allows the use of deflateSetHeader() with the returned nuclear@1: structure to duplicate the header. However if those fields are set to nuclear@1: allocated memory, then the application will need to save those pointers nuclear@1: elsewhere so that they can be eventually freed. nuclear@1: nuclear@1: If inflateGetHeader is not used, then the header information is simply nuclear@1: discarded. The header is always checked for validity, including the header nuclear@1: CRC if present. inflateReset() will reset the process to discard the header nuclear@1: information. The application would need to call inflateGetHeader() again to nuclear@1: retrieve the header from the next gzip stream. nuclear@1: nuclear@1: inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source nuclear@1: stream state was inconsistent. nuclear@1: */ nuclear@1: nuclear@1: /* nuclear@1: ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits, nuclear@1: unsigned char FAR *window)); nuclear@1: nuclear@1: Initialize the internal stream state for decompression using inflateBack() nuclear@1: calls. The fields zalloc, zfree and opaque in strm must be initialized nuclear@1: before the call. If zalloc and zfree are Z_NULL, then the default library- nuclear@1: derived memory allocation routines are used. windowBits is the base two nuclear@1: logarithm of the window size, in the range 8..15. window is a caller nuclear@1: supplied buffer of that size. Except for special applications where it is nuclear@1: assured that deflate was used with small window sizes, windowBits must be 15 nuclear@1: and a 32K byte window must be supplied to be able to decompress general nuclear@1: deflate streams. nuclear@1: nuclear@1: See inflateBack() for the usage of these routines. nuclear@1: nuclear@1: inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of nuclear@1: the paramaters are invalid, Z_MEM_ERROR if the internal state could not nuclear@1: be allocated, or Z_VERSION_ERROR if the version of the library does not nuclear@1: match the version of the header file. nuclear@1: */ nuclear@1: nuclear@1: typedef unsigned (*in_func) OF((void FAR *, unsigned char FAR * FAR *)); nuclear@1: typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned)); nuclear@1: nuclear@1: ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm, nuclear@1: in_func in, void FAR *in_desc, nuclear@1: out_func out, void FAR *out_desc)); nuclear@1: /* nuclear@1: inflateBack() does a raw inflate with a single call using a call-back nuclear@1: interface for input and output. This is more efficient than inflate() for nuclear@1: file i/o applications in that it avoids copying between the output and the nuclear@1: sliding window by simply making the window itself the output buffer. This nuclear@1: function trusts the application to not change the output buffer passed by nuclear@1: the output function, at least until inflateBack() returns. nuclear@1: nuclear@1: inflateBackInit() must be called first to allocate the internal state nuclear@1: and to initialize the state with the user-provided window buffer. nuclear@1: inflateBack() may then be used multiple times to inflate a complete, raw nuclear@1: deflate stream with each call. inflateBackEnd() is then called to free nuclear@1: the allocated state. nuclear@1: nuclear@1: A raw deflate stream is one with no zlib or gzip header or trailer. nuclear@1: This routine would normally be used in a utility that reads zip or gzip nuclear@1: files and writes out uncompressed files. The utility would decode the nuclear@1: header and process the trailer on its own, hence this routine expects nuclear@1: only the raw deflate stream to decompress. This is different from the nuclear@1: normal behavior of inflate(), which expects either a zlib or gzip header and nuclear@1: trailer around the deflate stream. nuclear@1: nuclear@1: inflateBack() uses two subroutines supplied by the caller that are then nuclear@1: called by inflateBack() for input and output. inflateBack() calls those nuclear@1: routines until it reads a complete deflate stream and writes out all of the nuclear@1: uncompressed data, or until it encounters an error. The function's nuclear@1: parameters and return types are defined above in the in_func and out_func nuclear@1: typedefs. inflateBack() will call in(in_desc, &buf) which should return the nuclear@1: number of bytes of provided input, and a pointer to that input in buf. If nuclear@1: there is no input available, in() must return zero--buf is ignored in that nuclear@1: case--and inflateBack() will return a buffer error. inflateBack() will call nuclear@1: out(out_desc, buf, len) to write the uncompressed data buf[0..len-1]. out() nuclear@1: should return zero on success, or non-zero on failure. If out() returns nuclear@1: non-zero, inflateBack() will return with an error. Neither in() nor out() nuclear@1: are permitted to change the contents of the window provided to nuclear@1: inflateBackInit(), which is also the buffer that out() uses to write from. nuclear@1: The length written by out() will be at most the window size. Any non-zero nuclear@1: amount of input may be provided by in(). nuclear@1: nuclear@1: For convenience, inflateBack() can be provided input on the first call by nuclear@1: setting strm->next_in and strm->avail_in. If that input is exhausted, then nuclear@1: in() will be called. Therefore strm->next_in must be initialized before nuclear@1: calling inflateBack(). If strm->next_in is Z_NULL, then in() will be called nuclear@1: immediately for input. If strm->next_in is not Z_NULL, then strm->avail_in nuclear@1: must also be initialized, and then if strm->avail_in is not zero, input will nuclear@1: initially be taken from strm->next_in[0 .. strm->avail_in - 1]. nuclear@1: nuclear@1: The in_desc and out_desc parameters of inflateBack() is passed as the nuclear@1: first parameter of in() and out() respectively when they are called. These nuclear@1: descriptors can be optionally used to pass any information that the caller- nuclear@1: supplied in() and out() functions need to do their job. nuclear@1: nuclear@1: On return, inflateBack() will set strm->next_in and strm->avail_in to nuclear@1: pass back any unused input that was provided by the last in() call. The nuclear@1: return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR nuclear@1: if in() or out() returned an error, Z_DATA_ERROR if there was a format nuclear@1: error in the deflate stream (in which case strm->msg is set to indicate the nuclear@1: nature of the error), or Z_STREAM_ERROR if the stream was not properly nuclear@1: initialized. In the case of Z_BUF_ERROR, an input or output error can be nuclear@1: distinguished using strm->next_in which will be Z_NULL only if in() returned nuclear@1: an error. If strm->next is not Z_NULL, then the Z_BUF_ERROR was due to nuclear@1: out() returning non-zero. (in() will always be called before out(), so nuclear@1: strm->next_in is assured to be defined if out() returns non-zero.) Note nuclear@1: that inflateBack() cannot return Z_OK. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm)); nuclear@1: /* nuclear@1: All memory allocated by inflateBackInit() is freed. nuclear@1: nuclear@1: inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream nuclear@1: state was inconsistent. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void)); nuclear@1: /* Return flags indicating compile-time options. nuclear@1: nuclear@1: Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other: nuclear@1: 1.0: size of uInt nuclear@1: 3.2: size of uLong nuclear@1: 5.4: size of voidpf (pointer) nuclear@1: 7.6: size of z_off_t nuclear@1: nuclear@1: Compiler, assembler, and debug options: nuclear@1: 8: DEBUG nuclear@1: 9: ASMV or ASMINF -- use ASM code nuclear@1: 10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention nuclear@1: 11: 0 (reserved) nuclear@1: nuclear@1: One-time table building (smaller code, but not thread-safe if true): nuclear@1: 12: BUILDFIXED -- build static block decoding tables when needed nuclear@1: 13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed nuclear@1: 14,15: 0 (reserved) nuclear@1: nuclear@1: Library content (indicates missing functionality): nuclear@1: 16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking nuclear@1: deflate code when not needed) nuclear@1: 17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect nuclear@1: and decode gzip streams (to avoid linking crc code) nuclear@1: 18-19: 0 (reserved) nuclear@1: nuclear@1: Operation variations (changes in library functionality): nuclear@1: 20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate nuclear@1: 21: FASTEST -- deflate algorithm with only one, lowest compression level nuclear@1: 22,23: 0 (reserved) nuclear@1: nuclear@1: The sprintf variant used by gzprintf (zero is best): nuclear@1: 24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format nuclear@1: 25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure! nuclear@1: 26: 0 = returns value, 1 = void -- 1 means inferred string length returned nuclear@1: nuclear@1: Remainder: nuclear@1: 27-31: 0 (reserved) nuclear@1: */ nuclear@1: nuclear@1: nuclear@1: /* utility functions */ nuclear@1: nuclear@1: /* nuclear@1: The following utility functions are implemented on top of the nuclear@1: basic stream-oriented functions. To simplify the interface, some nuclear@1: default options are assumed (compression level and memory usage, nuclear@1: standard memory allocation functions). The source code of these nuclear@1: utility functions can easily be modified if you need special options. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen, nuclear@1: const Bytef *source, uLong sourceLen)); nuclear@1: /* nuclear@1: Compresses the source buffer into the destination buffer. sourceLen is nuclear@1: the byte length of the source buffer. Upon entry, destLen is the total nuclear@1: size of the destination buffer, which must be at least the value returned nuclear@1: by compressBound(sourceLen). Upon exit, destLen is the actual size of the nuclear@1: compressed buffer. nuclear@1: This function can be used to compress a whole file at once if the nuclear@1: input file is mmap'ed. nuclear@1: compress returns Z_OK if success, Z_MEM_ERROR if there was not nuclear@1: enough memory, Z_BUF_ERROR if there was not enough room in the output nuclear@1: buffer. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT compress2 OF((Bytef *dest, uLongf *destLen, nuclear@1: const Bytef *source, uLong sourceLen, nuclear@1: int level)); nuclear@1: /* nuclear@1: Compresses the source buffer into the destination buffer. The level nuclear@1: parameter has the same meaning as in deflateInit. sourceLen is the byte nuclear@1: length of the source buffer. Upon entry, destLen is the total size of the nuclear@1: destination buffer, which must be at least the value returned by nuclear@1: compressBound(sourceLen). Upon exit, destLen is the actual size of the nuclear@1: compressed buffer. nuclear@1: nuclear@1: compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough nuclear@1: memory, Z_BUF_ERROR if there was not enough room in the output buffer, nuclear@1: Z_STREAM_ERROR if the level parameter is invalid. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen)); nuclear@1: /* nuclear@1: compressBound() returns an upper bound on the compressed size after nuclear@1: compress() or compress2() on sourceLen bytes. It would be used before nuclear@1: a compress() or compress2() call to allocate the destination buffer. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen, nuclear@1: const Bytef *source, uLong sourceLen)); nuclear@1: /* nuclear@1: Decompresses the source buffer into the destination buffer. sourceLen is nuclear@1: the byte length of the source buffer. Upon entry, destLen is the total nuclear@1: size of the destination buffer, which must be large enough to hold the nuclear@1: entire uncompressed data. (The size of the uncompressed data must have nuclear@1: been saved previously by the compressor and transmitted to the decompressor nuclear@1: by some mechanism outside the scope of this compression library.) nuclear@1: Upon exit, destLen is the actual size of the compressed buffer. nuclear@1: This function can be used to decompress a whole file at once if the nuclear@1: input file is mmap'ed. nuclear@1: nuclear@1: uncompress returns Z_OK if success, Z_MEM_ERROR if there was not nuclear@1: enough memory, Z_BUF_ERROR if there was not enough room in the output nuclear@1: buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete. nuclear@1: */ nuclear@1: nuclear@1: nuclear@1: typedef voidp gzFile; nuclear@1: nuclear@1: ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode)); nuclear@1: /* nuclear@1: Opens a gzip (.gz) file for reading or writing. The mode parameter nuclear@1: is as in fopen ("rb" or "wb") but can also include a compression level nuclear@1: ("wb9") or a strategy: 'f' for filtered data as in "wb6f", 'h' for nuclear@1: Huffman only compression as in "wb1h", or 'R' for run-length encoding nuclear@1: as in "wb1R". (See the description of deflateInit2 for more information nuclear@1: about the strategy parameter.) nuclear@1: nuclear@1: gzopen can be used to read a file which is not in gzip format; in this nuclear@1: case gzread will directly read from the file without decompression. nuclear@1: nuclear@1: gzopen returns NULL if the file could not be opened or if there was nuclear@1: insufficient memory to allocate the (de)compression state; errno nuclear@1: can be checked to distinguish the two cases (if errno is zero, the nuclear@1: zlib error is Z_MEM_ERROR). */ nuclear@1: nuclear@1: ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode)); nuclear@1: /* nuclear@1: gzdopen() associates a gzFile with the file descriptor fd. File nuclear@1: descriptors are obtained from calls like open, dup, creat, pipe or nuclear@1: fileno (in the file has been previously opened with fopen). nuclear@1: The mode parameter is as in gzopen. nuclear@1: The next call of gzclose on the returned gzFile will also close the nuclear@1: file descriptor fd, just like fclose(fdopen(fd), mode) closes the file nuclear@1: descriptor fd. If you want to keep fd open, use gzdopen(dup(fd), mode). nuclear@1: gzdopen returns NULL if there was insufficient memory to allocate nuclear@1: the (de)compression state. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy)); nuclear@1: /* nuclear@1: Dynamically update the compression level or strategy. See the description nuclear@1: of deflateInit2 for the meaning of these parameters. nuclear@1: gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not nuclear@1: opened for writing. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len)); nuclear@1: /* nuclear@1: Reads the given number of uncompressed bytes from the compressed file. nuclear@1: If the input file was not in gzip format, gzread copies the given number nuclear@1: of bytes into the buffer. nuclear@1: gzread returns the number of uncompressed bytes actually read (0 for nuclear@1: end of file, -1 for error). */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT gzwrite OF((gzFile file, nuclear@1: voidpc buf, unsigned len)); nuclear@1: /* nuclear@1: Writes the given number of uncompressed bytes into the compressed file. nuclear@1: gzwrite returns the number of uncompressed bytes actually written nuclear@1: (0 in case of error). nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORTVA gzprintf OF((gzFile file, const char *format, ...)); nuclear@1: /* nuclear@1: Converts, formats, and writes the args to the compressed file under nuclear@1: control of the format string, as in fprintf. gzprintf returns the number of nuclear@1: uncompressed bytes actually written (0 in case of error). The number of nuclear@1: uncompressed bytes written is limited to 4095. The caller should assure that nuclear@1: this limit is not exceeded. If it is exceeded, then gzprintf() will return nuclear@1: return an error (0) with nothing written. In this case, there may also be a nuclear@1: buffer overflow with unpredictable consequences, which is possible only if nuclear@1: zlib was compiled with the insecure functions sprintf() or vsprintf() nuclear@1: because the secure snprintf() or vsnprintf() functions were not available. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s)); nuclear@1: /* nuclear@1: Writes the given null-terminated string to the compressed file, excluding nuclear@1: the terminating null character. nuclear@1: gzputs returns the number of characters written, or -1 in case of error. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len)); nuclear@1: /* nuclear@1: Reads bytes from the compressed file until len-1 characters are read, or nuclear@1: a newline character is read and transferred to buf, or an end-of-file nuclear@1: condition is encountered. The string is then terminated with a null nuclear@1: character. nuclear@1: gzgets returns buf, or Z_NULL in case of error. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c)); nuclear@1: /* nuclear@1: Writes c, converted to an unsigned char, into the compressed file. nuclear@1: gzputc returns the value that was written, or -1 in case of error. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT gzgetc OF((gzFile file)); nuclear@1: /* nuclear@1: Reads one byte from the compressed file. gzgetc returns this byte nuclear@1: or -1 in case of end of file or error. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file)); nuclear@1: /* nuclear@1: Push one character back onto the stream to be read again later. nuclear@1: Only one character of push-back is allowed. gzungetc() returns the nuclear@1: character pushed, or -1 on failure. gzungetc() will fail if a nuclear@1: character has been pushed but not read yet, or if c is -1. The pushed nuclear@1: character will be discarded if the stream is repositioned with gzseek() nuclear@1: or gzrewind(). nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush)); nuclear@1: /* nuclear@1: Flushes all pending output into the compressed file. The parameter nuclear@1: flush is as in the deflate() function. The return value is the zlib nuclear@1: error number (see function gzerror below). gzflush returns Z_OK if nuclear@1: the flush parameter is Z_FINISH and all output could be flushed. nuclear@1: gzflush should be called only when strictly necessary because it can nuclear@1: degrade compression. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file, nuclear@1: z_off_t offset, int whence)); nuclear@1: /* nuclear@1: Sets the starting position for the next gzread or gzwrite on the nuclear@1: given compressed file. The offset represents a number of bytes in the nuclear@1: uncompressed data stream. The whence parameter is defined as in lseek(2); nuclear@1: the value SEEK_END is not supported. nuclear@1: If the file is opened for reading, this function is emulated but can be nuclear@1: extremely slow. If the file is opened for writing, only forward seeks are nuclear@1: supported; gzseek then compresses a sequence of zeroes up to the new nuclear@1: starting position. nuclear@1: nuclear@1: gzseek returns the resulting offset location as measured in bytes from nuclear@1: the beginning of the uncompressed stream, or -1 in case of error, in nuclear@1: particular if the file is opened for writing and the new starting position nuclear@1: would be before the current position. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT gzrewind OF((gzFile file)); nuclear@1: /* nuclear@1: Rewinds the given file. This function is supported only for reading. nuclear@1: nuclear@1: gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET) nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN z_off_t ZEXPORT gztell OF((gzFile file)); nuclear@1: /* nuclear@1: Returns the starting position for the next gzread or gzwrite on the nuclear@1: given compressed file. This position represents a number of bytes in the nuclear@1: uncompressed data stream. nuclear@1: nuclear@1: gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR) nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT gzeof OF((gzFile file)); nuclear@1: /* nuclear@1: Returns 1 when EOF has previously been detected reading the given nuclear@1: input stream, otherwise zero. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT gzdirect OF((gzFile file)); nuclear@1: /* nuclear@1: Returns 1 if file is being read directly without decompression, otherwise nuclear@1: zero. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN int ZEXPORT gzclose OF((gzFile file)); nuclear@1: /* nuclear@1: Flushes all pending output if necessary, closes the compressed file nuclear@1: and deallocates all the (de)compression state. The return value is the zlib nuclear@1: error number (see function gzerror below). nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum)); nuclear@1: /* nuclear@1: Returns the error message for the last error which occurred on the nuclear@1: given compressed file. errnum is set to zlib error number. If an nuclear@1: error occurred in the file system and not in the compression library, nuclear@1: errnum is set to Z_ERRNO and the application may consult errno nuclear@1: to get the exact error code. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN void ZEXPORT gzclearerr OF((gzFile file)); nuclear@1: /* nuclear@1: Clears the error and end-of-file flags for file. This is analogous to the nuclear@1: clearerr() function in stdio. This is useful for continuing to read a gzip nuclear@1: file that is being written concurrently. nuclear@1: */ nuclear@1: nuclear@1: /* checksum functions */ nuclear@1: nuclear@1: /* nuclear@1: These functions are not related to compression but are exported nuclear@1: anyway because they might be useful in applications using the nuclear@1: compression library. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len)); nuclear@1: /* nuclear@1: Update a running Adler-32 checksum with the bytes buf[0..len-1] and nuclear@1: return the updated checksum. If buf is NULL, this function returns nuclear@1: the required initial value for the checksum. nuclear@1: An Adler-32 checksum is almost as reliable as a CRC32 but can be computed nuclear@1: much faster. Usage example: nuclear@1: nuclear@1: uLong adler = adler32(0L, Z_NULL, 0); nuclear@1: nuclear@1: while (read_buffer(buffer, length) != EOF) { nuclear@1: adler = adler32(adler, buffer, length); nuclear@1: } nuclear@1: if (adler != original_adler) error(); nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2, nuclear@1: z_off_t len2)); nuclear@1: /* nuclear@1: Combine two Adler-32 checksums into one. For two sequences of bytes, seq1 nuclear@1: and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for nuclear@1: each, adler1 and adler2. adler32_combine() returns the Adler-32 checksum of nuclear@1: seq1 and seq2 concatenated, requiring only adler1, adler2, and len2. nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len)); nuclear@1: /* nuclear@1: Update a running CRC-32 with the bytes buf[0..len-1] and return the nuclear@1: updated CRC-32. If buf is NULL, this function returns the required initial nuclear@1: value for the for the crc. Pre- and post-conditioning (one's complement) is nuclear@1: performed within this function so it shouldn't be done by the application. nuclear@1: Usage example: nuclear@1: nuclear@1: uLong crc = crc32(0L, Z_NULL, 0); nuclear@1: nuclear@1: while (read_buffer(buffer, length) != EOF) { nuclear@1: crc = crc32(crc, buffer, length); nuclear@1: } nuclear@1: if (crc != original_crc) error(); nuclear@1: */ nuclear@1: nuclear@1: ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2)); nuclear@1: nuclear@1: /* nuclear@1: Combine two CRC-32 check values into one. For two sequences of bytes, nuclear@1: seq1 and seq2 with lengths len1 and len2, CRC-32 check values were nuclear@1: calculated for each, crc1 and crc2. crc32_combine() returns the CRC-32 nuclear@1: check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and nuclear@1: len2. nuclear@1: */ nuclear@1: nuclear@1: nuclear@1: /* various hacks, don't look :) */ nuclear@1: nuclear@1: /* deflateInit and inflateInit are macros to allow checking the zlib version nuclear@1: * and the compiler's view of z_stream: nuclear@1: */ nuclear@1: ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level, nuclear@1: const char *version, int stream_size)); nuclear@1: ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm, nuclear@1: const char *version, int stream_size)); nuclear@1: ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int level, int method, nuclear@1: int windowBits, int memLevel, nuclear@1: int strategy, const char *version, nuclear@1: int stream_size)); nuclear@1: ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int windowBits, nuclear@1: const char *version, int stream_size)); nuclear@1: ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits, nuclear@1: unsigned char FAR *window, nuclear@1: const char *version, nuclear@1: int stream_size)); nuclear@1: #define deflateInit(strm, level) \ nuclear@1: deflateInit_((strm), (level), ZLIB_VERSION, sizeof(z_stream)) nuclear@1: #define inflateInit(strm) \ nuclear@1: inflateInit_((strm), ZLIB_VERSION, sizeof(z_stream)) nuclear@1: #define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ nuclear@1: deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\ nuclear@1: (strategy), ZLIB_VERSION, sizeof(z_stream)) nuclear@1: #define inflateInit2(strm, windowBits) \ nuclear@1: inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream)) nuclear@1: #define inflateBackInit(strm, windowBits, window) \ nuclear@1: inflateBackInit_((strm), (windowBits), (window), \ nuclear@1: ZLIB_VERSION, sizeof(z_stream)) nuclear@1: nuclear@1: nuclear@1: #if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL) nuclear@1: struct internal_state {int dummy;}; /* hack for buggy compilers */ nuclear@1: #endif nuclear@1: nuclear@1: ZEXTERN const char * ZEXPORT zError OF((int)); nuclear@1: ZEXTERN int ZEXPORT inflateSyncPoint OF((z_streamp z)); nuclear@1: ZEXTERN const uLongf * ZEXPORT get_crc_table OF((void)); nuclear@1: nuclear@1: #ifdef __cplusplus nuclear@1: } nuclear@1: #endif nuclear@1: nuclear@1: #endif /* ZLIB_H */