+ 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 Z_NULL).
+*/
+
+ZEXTERN int ZEXPORT inflateReset2 OF((z_streamp strm,
+ int windowBits));
+/*
+ This function is the same as inflateReset, but it also permits changing
+ the wrap and window size requests. The windowBits parameter is interpreted
+ the same as it is for inflateInit2.
+
+ inflateReset2 returns Z_OK if success, or Z_STREAM_ERROR if the source
+ stream state was inconsistent (such as zalloc or state being Z_NULL), or if
+ the windowBits parameter is invalid.
+*/
+
+ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm,
+ int bits,
+ int value));
+/*
+ This function inserts bits in the inflate input stream. The intent is
+ that this function is used to start inflating at a bit position in the
+ middle of a byte. The provided bits will be used before any bytes are used
+ from next_in. This function should only be used with raw inflate, and
+ should be used before the first inflate() call after inflateInit2() or
+ inflateReset(). bits must be less than or equal to 16, and that many of the
+ least significant bits of value will be inserted in the input.
+
+ If bits is negative, then the input stream bit buffer is emptied. Then
+ inflatePrime() can be called again to put bits in the buffer. This is used
+ to clear out bits leftover after feeding inflate a block description prior
+ to feeding inflate codes.
+
+ inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source
+ stream state was inconsistent.
+*/
+
+ZEXTERN long ZEXPORT inflateMark OF((z_streamp strm));
+/*
+ This function returns two values, one in the lower 16 bits of the return
+ value, and the other in the remaining upper bits, obtained by shifting the
+ return value down 16 bits. If the upper value is -1 and the lower value is
+ zero, then inflate() is currently decoding information outside of a block.
+ If the upper value is -1 and the lower value is non-zero, then inflate is in
+ the middle of a stored block, with the lower value equaling the number of
+ bytes from the input remaining to copy. If the upper value is not -1, then
+ it is the number of bits back from the current bit position in the input of
+ the code (literal or length/distance pair) currently being processed. In
+ that case the lower value is the number of bytes already emitted for that
+ code.
+
+ A code is being processed if inflate is waiting for more input to complete
+ decoding of the code, or if it has completed decoding but is waiting for
+ more output space to write the literal or match data.
+
+ inflateMark() is used to mark locations in the input data for random
+ access, which may be at bit positions, and to note those cases where the
+ output of a code may span boundaries of random access blocks. The current
+ location in the input stream can be determined from avail_in and data_type
+ as noted in the description for the Z_BLOCK flush parameter for inflate.
+
+ inflateMark returns the value noted above or -1 << 16 if the provided
+ source stream state was inconsistent.
+*/
+
+ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm,
+ gz_headerp head));
+/*
+ inflateGetHeader() requests that gzip header information be stored in the
+ provided gz_header structure. inflateGetHeader() may be called after
+ inflateInit2() or inflateReset(), and before the first call of inflate().
+ As inflate() processes the gzip stream, head->done is zero until the header
+ is completed, at which time head->done is set to one. If a zlib stream is
+ being decoded, then head->done is set to -1 to indicate that there will be
+ no gzip header information forthcoming. Note that Z_BLOCK or Z_TREES can be
+ used to force inflate() to return immediately after header processing is
+ complete and before any actual data is decompressed.
+
+ The text, time, xflags, and os fields are filled in with the gzip header
+ contents. hcrc is set to true if there is a header CRC. (The header CRC
+ was valid if done is set to one.) If extra is not Z_NULL, then extra_max
+ contains the maximum number of bytes to write to extra. Once done is true,
+ extra_len contains the actual extra field length, and extra contains the
+ extra field, or that field truncated if extra_max is less than extra_len.
+ If name is not Z_NULL, then up to name_max characters are written there,
+ terminated with a zero unless the length is greater than name_max. If
+ comment is not Z_NULL, then up to comm_max characters are written there,
+ terminated with a zero unless the length is greater than comm_max. When any
+ of extra, name, or comment are not Z_NULL and the respective field is not
+ present in the header, then that field is set to Z_NULL to signal its
+ absence. This allows the use of deflateSetHeader() with the returned
+ structure to duplicate the header. However if those fields are set to
+ allocated memory, then the application will need to save those pointers
+ elsewhere so that they can be eventually freed.
+
+ If inflateGetHeader is not used, then the header information is simply
+ discarded. The header is always checked for validity, including the header
+ CRC if present. inflateReset() will reset the process to discard the header
+ information. The application would need to call inflateGetHeader() again to
+ retrieve the header from the next gzip stream.
+
+ inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
+ stream state was inconsistent.
+*/
+
+/*
+ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits,
+ unsigned char FAR *window));
+
+ Initialize the internal stream state for decompression using inflateBack()
+ calls. The fields zalloc, zfree and opaque in strm must be initialized
+ before the call. If zalloc and zfree are Z_NULL, then the default library-
+ derived memory allocation routines are used. windowBits is the base two
+ logarithm of the window size, in the range 8..15. window is a caller
+ supplied buffer of that size. Except for special applications where it is
+ assured that deflate was used with small window sizes, windowBits must be 15
+ and a 32K byte window must be supplied to be able to decompress general
+ deflate streams.
+
+ See inflateBack() for the usage of these routines.
+
+ inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of
+ the parameters are invalid, Z_MEM_ERROR if the internal state could not be
+ allocated, or Z_VERSION_ERROR if the version of the library does not match
+ the version of the header file.
+*/
+
+typedef unsigned (*in_func) OF((void FAR *, unsigned char FAR * FAR *));
+typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned));
+
+ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm,
+ in_func in, void FAR *in_desc,
+ out_func out, void FAR *out_desc));
+/*
+ inflateBack() does a raw inflate with a single call using a call-back
+ interface for input and output. This is more efficient than inflate() for
+ file i/o applications in that it avoids copying between the output and the
+ sliding window by simply making the window itself the output buffer. This
+ function trusts the application to not change the output buffer passed by
+ the output function, at least until inflateBack() returns.
+
+ inflateBackInit() must be called first to allocate the internal state
+ and to initialize the state with the user-provided window buffer.
+ inflateBack() may then be used multiple times to inflate a complete, raw
+ deflate stream with each call. inflateBackEnd() is then called to free the
+ allocated state.
+
+ A raw deflate stream is one with no zlib or gzip header or trailer.
+ This routine would normally be used in a utility that reads zip or gzip
+ files and writes out uncompressed files. The utility would decode the
+ header and process the trailer on its own, hence this routine expects only
+ the raw deflate stream to decompress. This is different from the normal
+ behavior of inflate(), which expects either a zlib or gzip header and
+ trailer around the deflate stream.
+
+ inflateBack() uses two subroutines supplied by the caller that are then
+ called by inflateBack() for input and output. inflateBack() calls those
+ routines until it reads a complete deflate stream and writes out all of the
+ uncompressed data, or until it encounters an error. The function's
+ parameters and return types are defined above in the in_func and out_func
+ typedefs. inflateBack() will call in(in_desc, &buf) which should return the
+ number of bytes of provided input, and a pointer to that input in buf. If
+ there is no input available, in() must return zero--buf is ignored in that
+ case--and inflateBack() will return a buffer error. inflateBack() will call
+ out(out_desc, buf, len) to write the uncompressed data buf[0..len-1]. out()
+ should return zero on success, or non-zero on failure. If out() returns
+ non-zero, inflateBack() will return with an error. Neither in() nor out()
+ are permitted to change the contents of the window provided to
+ inflateBackInit(), which is also the buffer that out() uses to write from.
+ The length written by out() will be at most the window size. Any non-zero
+ amount of input may be provided by in().
+
+ For convenience, inflateBack() can be provided input on the first call by
+ setting strm->next_in and strm->avail_in. If that input is exhausted, then
+ in() will be called. Therefore strm->next_in must be initialized before
+ calling inflateBack(). If strm->next_in is Z_NULL, then in() will be called
+ immediately for input. If strm->next_in is not Z_NULL, then strm->avail_in
+ must also be initialized, and then if strm->avail_in is not zero, input will
+ initially be taken from strm->next_in[0 .. strm->avail_in - 1].
+
+ The in_desc and out_desc parameters of inflateBack() is passed as the
+ first parameter of in() and out() respectively when they are called. These
+ descriptors can be optionally used to pass any information that the caller-
+ supplied in() and out() functions need to do their job.
+
+ On return, inflateBack() will set strm->next_in and strm->avail_in to
+ pass back any unused input that was provided by the last in() call. The
+ return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR
+ if in() or out() returned an error, Z_DATA_ERROR if there was a format error
+ in the deflate stream (in which case strm->msg is set to indicate the nature
+ of the error), or Z_STREAM_ERROR if the stream was not properly initialized.
+ In the case of Z_BUF_ERROR, an input or output error can be distinguished
+ using strm->next_in which will be Z_NULL only if in() returned an error. If
+ strm->next_in is not Z_NULL, then the Z_BUF_ERROR was due to out() returning
+ non-zero. (in() will always be called before out(), so strm->next_in is
+ assured to be defined if out() returns non-zero.) Note that inflateBack()
+ cannot return Z_OK.
+*/
+
+ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm));
+/*
+ All memory allocated by inflateBackInit() is freed.