31 files changed, 302 insertions, 192 deletions
diff --git a/ChangeLog b/ChangeLog
index ffbe1c4..218cfb0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,25 @@
                ChangeLog file for zlib
+Changes in 1.0.4 (24 Jul 96)
+- In very rare conditions, deflate(s, Z_FINISH) could fail to produce an EOF
+  bit, so the decompressor could decompress all the correct data but went
+  on to attempt decompressing extra garbage data. This affected minigzip too.
+- zlibVersion and gzerror return const char* (needed for DLL)
+- port to RISCOS (no fdopen, no multiple dots, no unlink, no fileno)
+- use z_error only for DEBUG (avoid problem with DLLs)
+Changes in 1.0.3 (2 Jul 96)
+- use z_streamp instead of z_stream *, which is now a far pointer in MSDOS
+  small and medium models; this makes the library incompatible with previous
+  versions for these models. (No effect in large model or on other systems.)
+- return OK instead of BUF_ERROR if previous deflate call returned with
+  avail_out as zero but there is nothing to do
+- added memcmp for non STDC compilers
+- define NO_DUMMY_DECL for more Mac compilers (.h files merged incorrectly)
+- define __32BIT__ if __386__ or i386 is defined (pb. with Watcom and SCO)
+- better check for 16-bit mode MSC (avoids problem with Symantec)
 Changes in 1.0.2 (23 May 96)
 - added Windows DLL support
 - added a function zlibVersion (for the DLL support)
diff --git a/INDEX b/INDEX
index dc13753..bb1e3f0 100644
--- a/INDEX
+++ b/INDEX
@@ -7,6 +7,7 @@ Makefile.bor	makefile for Borland C/C++ 16-bit
 Makefile.dj2    makefile for DJGPP 2.x
 Makefile.in     makefile for Unix (template for configure)
 Makefile.msc    makefile for Microsoft C 16-bit
+Makefile.riscos makefile for RISCOS
 Makefile.sas    makefile for Amiga SAS/C
 Makefile.tc     makefile for Turbo C
 Makefile.wat    makefile for Watcom C
diff --git a/Makefile b/Makefile
index f2ff262..71b269b 100644
--- a/Makefile
+++ b/Makefile
@@ -22,7 +22,7 @@ CFLAGS=-O
 LDFLAGS=-L. -lz
 LDSHARED=$(CC)
-VER=1.0.2
+VER=1.0.4
 LIBS=libz.a
 AR=ar rc
diff --git a/Makefile.dj2 b/Makefile.dj2
index 07a9bb1..398f28b 100644
--- a/Makefile.dj2
+++ b/Makefile.dj2
@@ -42,7 +42,6 @@ LDLIBS=-L. -lz
 LD=$(CC) -s -o
 LDSHARED=$(CC)
-VER=1.0.2
 INCL=zlib.h zconf.h
 LIBS=libz.a
@@ -68,10 +67,6 @@ test: all
 libz.a: $(OBJS)
        $(AR) $@ $(OBJS)
-libz.so.$(VER): $(OBJS)
-        $(LDSHARED) -o $@ $(OBJS)
-        $(RM) libz.so; ln -s $@ libz.so
 %.exe : %.o $(LIBS)
        $(LD) $@ $< $(LDLIBS)
@@ -90,7 +85,7 @@ uninstall:
        for %%p in ($(LIBS)) do $(RM) $(LIBRARY_PATH)\%%p
 clean:
-        for %%p in (*.d *.o *.exe libz.a libz.so*) do $(RM) %%p
+        for %%p in (*.d *.o *.exe libz.a libz.so* foo.gz) do $(RM) %%p
 DEPS := $(wildcard *.d)
 ifneq ($(DEPS),)
diff --git a/Makefile.in b/Makefile.in
index f2ff262..71b269b 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -22,7 +22,7 @@ CFLAGS=-O
 LDFLAGS=-L. -lz
 LDSHARED=$(CC)
-VER=1.0.2
+VER=1.0.4
 LIBS=libz.a
 AR=ar rc
diff --git a/Makefile.msc b/Makefile.msc
index 3b7aabd..112684a 100644
--- a/Makefile.msc
+++ b/Makefile.msc
@@ -28,6 +28,8 @@ OBJ2 = zutil$(O) inflate$(O) infblock$(O) inftrees$(O) infcodes$(O) \
 OBJP2 = zutil$(O)+inflate$(O)+infblock$(O)+inftrees$(O)+infcodes$(O)+\
  infutil$(O)+inffast$(O)
+all:  zlib.lib example.exe minigzip.exe
 adler32.obj: adler32.c zutil.h zlib.h zconf.h
        $(CC) -c $(CFLAGS) $*.c
@@ -80,7 +82,7 @@ minigzip.obj: minigzip.c zlib.h zconf.h
 # we must cut the command line to fit in the MS/DOS 128 byte limit:
 zlib.lib: $(OBJ1) $(OBJ2)
-        del zlib.lib
+        if exist zlib.lib del zlib.lib
        lib zlib $(OBJ1);
        lib zlib $(OBJ2);
diff --git a/Makefile.riscos b/Makefile.riscos
new file mode 100644
index 0000000..0f10aa8
--- /dev/null
+++ b/Makefile.riscos
@@ -0,0 +1,46 @@
+# Project:   zlib_1_03
+# Toolflags:
+CCflags = -c -depend !Depend -IC: -g -throwback  -DRISCOS  -fnah 
+C++flags = -c -depend !Depend -IC: -throwback
+Linkflags = -aif -c++ -o $@ 
+ObjAsmflags = -throwback -NoCache -depend !Depend
+CMHGflags = 
+LibFileflags = -c -l -o $@ 
+Squeezeflags = -o $@
+# Final targets:
+@.zlib_lib:   @.o.adler32 @.o.compress @.o.crc32 @.o.deflate @.o.gzio \
+        @.o.infblock @.o.infcodes @.o.inffast @.o.inflate @.o.inftrees @.o.infutil @.o.trees \
+        @.o.uncompress @.o.zutil 
+        LibFile $(LibFileflags) @.o.adler32 @.o.compress @.o.crc32 @.o.deflate \
+        @.o.gzio @.o.infblock @.o.infcodes @.o.inffast @.o.inflate @.o.inftrees @.o.infutil \
+        @.o.trees @.o.uncompress @.o.zutil 
+@.test:   @.tests.minigzip @.tests.example 
+        echo Please run "Test" in directory tests 
+@.tests.minigzip:   @.o.minigzip @.zlib_lib C:o.Stubs 
+        Link $(Linkflags) @.o.minigzip @.zlib_lib C:o.Stubs 
+@.tests.example:   @.o.example @.zlib_lib C:o.Stubs 
+        Link $(Linkflags) @.o.example @.zlib_lib C:o.Stubs 
+# User-editable dependencies:
+.c.o:
+        cc $(ccflags) -o $@ $<
+# Static dependencies:
+@.o.example:   @.tests.c.example
+        cc $(ccflags) -o @.o.example @.tests.c.example 
+@.o.minigzip:   @.tests.c.minigzip
+        cc $(ccflags) -o @.o.minigzip @.tests.c.minigzip 
+# Dynamic dependencies:
+o.minigzip:     tests.c.minigzip
+o.minigzip:     h.zlib
+o.minigzip:     h.zconf
+o.example:      tests.c.example
+o.example:      h.zlib
+o.example:      h.zconf
diff --git a/README b/README
index 217f3b1..28adc90 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-zlib 1.0.2 is a general purpose data compression library.  All the code
+zlib 1.0.4 is a general purpose data compression library.  All the code
 is reentrant (thread safe).  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
@@ -18,21 +18,17 @@ makefiles such as Makefile.msc; for VMS, use Make_vms.com or descrip.mms.
 Questions about zlib should be sent to <zlib@quest.jpl.nasa.gov> or,
 if this fails, to the addresses given below in the Copyright section.
+The zlib home page is http://quest.jpl.nasa.gov/zlib/
+The changes made in version 1.0.4 are documented in the file ChangeLog.
+The main changes since 1.0.3 are:
+- In very rare conditions, deflate(s, Z_FINISH) could fail to produce an EOF
+  bit, so the decompressor could decompress all the correct data but went
+  on to attempt decompressing extra garbage data. This affected minigzip too.
+- zlibVersion and gzerror return const char* (needed for DLL)
+- port to RISCOS (no fdopen, no multiple dots, no unlink, no fileno)
-The changes made in version 1.0.2 are documented in the file ChangeLog.
-The main changes since 0.99 are:
- fix array overlay in deflate.c which sometimes caused bad compressed data
- fix inflate bug with empty stored block
- fix MSDOS medium model which was broken in 0.99
- fix deflateParams() which could generated bad compressed data.
- added an INDEX file
- new makefiles for DJGPP (Makefile.dj2), 32-bit Borland (Makefile.b32),
-  Watcom (Makefile.wat), Amiga SAS/C (Makefile.sas)
- several portability improvements
- added algorithm.doc
- added Windows DLL support
- added a function zlibVersion (for the DLL support)
 A Perl interface to zlib written by Paul Marquess <pmarquess@bfsec.bt.co.uk>
 is in the CPAN (Comprehensive Perl Archive Network) sites, such as:
@@ -46,7 +42,7 @@ Notes for some targets:
 - For 64-bit Iris, deflate.c must be compiled without any optimization.
  With -O, one libpng test fails. The test works in 32 bit mode (with
-  the -32 compiler flag).
+  the -32 compiler flag). The compiler bug has been reported to SGI.
 - zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1   
  it works when compiled with cc.
@@ -57,7 +53,10 @@ Notes for some targets:
 - To build a Windows DLL version, include in a DLL project zlib.def, zlib.rc
  and all .c files except example.c and minigzip.c; compile with -DZLIB_DLL
  For help on building a zlib DLL, contact Alessandro Iacopetti
-  <iaco@cicladi.unial.it>
+  <iaco@email.alessandria.alpcom.it>  http://lisa.unial.it/iaco ,
+  or contact Brad Clarke <bclarke@cyberus.ca>.
+- gzdopen is not supported on RISCOS
 Acknowledgments:
diff --git a/algorithm.doc b/algorithm.doc
index 156058a..01902af 100644
--- a/algorithm.doc
+++ b/algorithm.doc
@@ -7,7 +7,7 @@ pointer to the previous string, in the form of a pair (distance,
 length).  Distances are limited to 32K bytes, and lengths are limited
 to 258 bytes. When a string does not occur anywhere in the previous
 32K bytes, it is emitted as a sequence of literal bytes.  (In this
-description, 'string' must be taken as an arbitrary sequence of bytes,
+description, `string' must be taken as an arbitrary sequence of bytes,
 and is not restricted to printable characters.)
 Literals or match lengths are compressed with one Huffman tree, and
@@ -16,7 +16,7 @@ in a compact form at the start of each block. The blocks can have any
 size (except that the compressed data for one block must fit in
 available memory). A block is terminated when deflate() determines that
 it would be useful to start another block with fresh trees. (This is
-somewhat similar to compress.)
+somewhat similar to the behavior of LZW-based _compress_.)
 Duplicated strings are found using a hash table. All input strings of
 length 3 are inserted in the hash table. A hash index is computed for
@@ -57,7 +57,7 @@ but saves time since there are both fewer insertions and fewer searches.
 2. Decompression algorithm (inflate)
-The real question is given a Huffman tree, how to decode fast.  The most
+The real question is, given a Huffman tree, how to decode fast.  The most
 important realization is that shorter codes are much more common than
 longer codes, so pay attention to decoding the short codes fast, and let
 the long codes take longer to decode.
@@ -84,7 +84,7 @@ all the data.  For inflate, which has 286 possible codes for the
 literal/length tree, the size of the first table is nine bits.  Also the
 distance trees have 30 possible values, and the size of the first table is
 six bits.  Note that for each of those cases, the table ended up one bit
-longer than the "average" code length, i.e. the code length of an
+longer than the ``average'' code length, i.e. the code length of an
 approximately flat code which would be a little more than eight bits for
 286 symbols and a little less than five bits for 30 symbols.  It would be
 interesting to see if optimizing the first level table for other
@@ -97,9 +97,9 @@ gzip@prep.ai.mit.edu    madler@alumni.caltech.edu
 References:
-[LZ77] Ziv J., Lempel A., "A Universal Algorithm for Sequential Data
+[LZ77] Ziv J., Lempel A., ``A Universal Algorithm for Sequential Data
-Compression", IEEE Transactions on Information Theory", Vol. 23, No. 3,
+Compression,'' IEEE Transactions on Information Theory, Vol. 23, No. 3,
 pp. 337-343.
-"DEFLATE Compressed Data Format Specification" available in
+``DEFLATE Compressed Data Format Specification'' available in
 ftp://ds.internic.net/rfc/rfc1951.txt
diff --git a/deflate.c b/deflate.c
index f882a87..c6ba9b4 100644
--- a/deflate.c
+++ b/deflate.c
@@ -47,11 +47,11 @@
 *
 */
-/* $Id: deflate.c,v 1.13 1996/05/22 11:52:21 me Exp $ */
+/* $Id: deflate.c,v 1.15 1996/07/24 13:40:58 me Exp $ */
 #include "deflate.h"
-char deflate_copyright[] = " deflate 1.0.2 Copyright 1995-1996 Jean-loup Gailly ";
+char deflate_copyright[] = " deflate 1.0.4 Copyright 1995-1996 Jean-loup Gailly ";
 /*
  If you use the zlib library in a product, an acknowledgment is welcome
  in the documentation of your product. If for some reason you cannot
@@ -62,15 +62,25 @@ char deflate_copyright[] = " deflate 1.0.2 Copyright 1995-1996 Jean-loup Gailly
 /* ===========================================================================
 *  Function prototypes.
 */
+typedef enum {
+    need_more,      /* block not completed, need more input or more output */
+    block_done,     /* block flush performed */
+    finish_started, /* finish started, need only more output at next deflate */
+    finish_done     /* finish done, accept no more input or output */
+} block_state;
+typedef block_state (*compress_func) OF((deflate_state *s, int flush));
+/* Compression function. Returns the block state after the call. */
 local void fill_window    OF((deflate_state *s));
-local int  deflate_stored OF((deflate_state *s, int flush));
+local block_state deflate_stored OF((deflate_state *s, int flush));
-local int  deflate_fast   OF((deflate_state *s, int flush));
+local block_state deflate_fast   OF((deflate_state *s, int flush));
-local int  deflate_slow   OF((deflate_state *s, int flush));
+local block_state deflate_slow   OF((deflate_state *s, int flush));
 local void lm_init        OF((deflate_state *s));
 local uInt longest_match  OF((deflate_state *s, IPos cur_match));
 local void putShortMSB    OF((deflate_state *s, uInt b));
-local void flush_pending  OF((z_stream *strm));
+local void flush_pending  OF((z_streamp strm));
-local int read_buf        OF((z_stream *strm, charf *buf, unsigned size));
+local int read_buf        OF((z_streamp strm, charf *buf, unsigned size));
 #ifdef ASMV
      void match_init OF((void)); /* asm code initialization */
 #endif
@@ -97,9 +107,6 @@ local  void check_match OF((deflate_state *s, IPos start, IPos match,
 * See deflate.c for comments about the MIN_MATCH+1.
 */
-typedef int (*compress_func) OF((deflate_state *s, int flush));
-/* Compressing function */
 /* Values for max_lazy_match, good_match and max_chain_length, depending on
 * the desired pack level (0..9). The values given below have been tuned to
 * exclude worst case performance for pathological files. Better values may be
@@ -169,7 +176,7 @@ struct static_tree_desc_s {int dummy;}; /* for buggy compilers */
 /* ========================================================================= */
 int deflateInit_(strm, level, version, stream_size)
-    z_stream *strm;
+    z_streamp strm;
    int level;
    const char *version;
    int stream_size;
@@ -182,7 +189,7 @@ int deflateInit_(strm, level, version, stream_size)
 /* ========================================================================= */
 int deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
                  version, stream_size)
-    z_stream *strm;
+    z_streamp strm;
    int  level;
    int  method;
    int  windowBits;
@@ -249,7 +256,7 @@ int deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
    if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL ||
        s->pending_buf == Z_NULL) {
-        strm->msg = ERR_MSG(Z_MEM_ERROR);
+        strm->msg = (char*)ERR_MSG(Z_MEM_ERROR);
        deflateEnd (strm);
        return Z_MEM_ERROR;
    }
@@ -265,7 +272,7 @@ int deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
 /* ========================================================================= */
 int deflateSetDictionary (strm, dictionary, dictLength)
-    z_stream *strm;
+    z_streamp strm;
    const Bytef *dictionary;
    uInt  dictLength;
 {
@@ -304,7 +311,7 @@ int deflateSetDictionary (strm, dictionary, dictLength)
 /* ========================================================================= */
 int deflateReset (strm)
-    z_stream *strm;
+    z_streamp strm;
 {
    deflate_state *s;
    
@@ -334,7 +341,7 @@ int deflateReset (strm)
 /* ========================================================================= */
 int deflateParams(strm, level, strategy)
-    z_stream *strm;
+    z_streamp strm;
    int level;
    int strategy;
 {
@@ -388,7 +395,7 @@ local void putShortMSB (s, b)
 * (See also read_buf()).
 */
 local void flush_pending(strm)
-    z_stream *strm;
+    z_streamp strm;
 {
    unsigned len = strm->state->pending;
@@ -408,14 +415,16 @@ local void flush_pending(strm)
 /* ========================================================================= */
 int deflate (strm, flush)
-    z_stream *strm;
+    z_streamp strm;
    int flush;
 {
    int old_flush; /* value of flush param for previous deflate call */
    deflate_state *s;
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (strm == Z_NULL || strm->state == Z_NULL ||
-    
+        flush > Z_FINISH || flush < 0) {
+        return Z_STREAM_ERROR;
+    }
    s = strm->state;
    if (strm->next_out == Z_NULL ||
@@ -447,14 +456,23 @@ int deflate (strm, flush)
        if (s->strstart != 0) {
            putShortMSB(s, (uInt)(strm->adler >> 16));
            putShortMSB(s, (uInt)(strm->adler & 0xffff));
-            strm->adler = 1L;
        }
+        strm->adler = 1L;
    }
    /* Flush as much pending output as possible */
    if (s->pending != 0) {
        flush_pending(strm);
-        if (strm->avail_out == 0) return Z_OK;
+        if (strm->avail_out == 0) {
+            /* Since avail_out is 0, deflate will be called again with
+             * more output space, but possibly with both pending and
+             * avail_in equal to zero. There won't be anything to do,
+             * but this is not an error situation so make sure we
+             * return OK instead of BUF_ERROR at next call of deflate:
+             */
+            s->last_flush = -1;
+            return Z_OK;
+        }
    /* Make sure there is something to do and avoid duplicate consecutive
     * flushes. For repeated and useless calls with Z_FINISH, we keep
@@ -474,22 +492,27 @@ int deflate (strm, flush)
     */
    if (strm->avail_in != 0 || s->lookahead != 0 ||
        (flush != Z_NO_FLUSH && s->status != FINISH_STATE)) {
-        int quit;
+        block_state bstate;
-        if (flush == Z_FINISH) {
+        bstate = (*(configuration_table[s->level].func))(s, flush);
+        if (bstate == finish_started || bstate == finish_done) {
            s->status = FINISH_STATE;
        }
-        quit = (*(configuration_table[s->level].func))(s, flush);
+        if (bstate == need_more || bstate == finish_started) {
+            if (strm->avail_out == 0) {
-        if (quit || strm->avail_out == 0) return Z_OK;
+                s->last_flush = -1; /* avoid BUF_ERROR next call, see above */
-        /* If flush != Z_NO_FLUSH && avail_out == 0, the next call
+            }
-         * of deflate should use the same flush parameter to make sure
+            return Z_OK;
-         * that the flush is complete. So we don't have to output an
+            /* If flush != Z_NO_FLUSH && avail_out == 0, the next call
-         * empty block here, this will be done at next call. This also
+             * of deflate should use the same flush parameter to make sure
-         * ensures that for a very small output buffer, we emit at most
+             * that the flush is complete. So we don't have to output an
-         * one empty block.
+             * empty block here, this will be done at next call. This also
-         */
+             * ensures that for a very small output buffer, we emit at most
-        if (flush != Z_NO_FLUSH && flush != Z_FINISH) {
+             * one empty block.
+             */
+        }
+        if (bstate == block_done) {
            if (flush == Z_PARTIAL_FLUSH) {
                _tr_align(s);
            } else { /* FULL_FLUSH or SYNC_FLUSH */
@@ -502,7 +525,10 @@ int deflate (strm, flush)
                }
            }
            flush_pending(strm);
-            if (strm->avail_out == 0) return Z_OK;
+            if (strm->avail_out == 0) {
+              s->last_flush = -1; /* avoid BUF_ERROR at next call, see above */
+              return Z_OK;
+            }
        }
    }
    Assert(strm->avail_out > 0, "bug2");
@@ -523,7 +549,7 @@ int deflate (strm, flush)
 /* ========================================================================= */
 int deflateEnd (strm)
-    z_stream *strm;
+    z_streamp strm;
 {
    int status;
@@ -544,8 +570,8 @@ int deflateEnd (strm)
 /* ========================================================================= */
 int deflateCopy (dest, source)
-    z_stream *dest;
+    z_streamp dest;
-    z_stream *source;
+    z_streamp source;
 {
    if (source == Z_NULL || dest == Z_NULL || source->state == Z_NULL) {
        return Z_STREAM_ERROR;
@@ -570,7 +596,7 @@ int deflateCopy (dest, source)
 * (See also flush_pending()).
 */
 local int read_buf(strm, buf, size)
-    z_stream *strm;
+    z_streamp strm;
    charf *buf;
    unsigned size;
 {
@@ -916,18 +942,18 @@ local void fill_window(s)
 /* Same but force premature exit if necessary. */
 #define FLUSH_BLOCK(s, eof) { \
   FLUSH_BLOCK_ONLY(s, eof); \
-   if (s->strm->avail_out == 0) return 1; \
+   if (s->strm->avail_out == 0) return (eof) ? finish_started : need_more; \
 }
 /* ===========================================================================
 * Copy without compression as much as possible from the input stream, return
- * true if processing was terminated prematurely (no more input or output
+ * the current block state.
- * space).  This function does not insert new strings in the dictionary
+ * This function does not insert new strings in the dictionary since
- * since uncompressible data is probably not useful. This function is used
+ * uncompressible data is probably not useful. This function is used
 * only for the level=0 compression option.
 * NOTE: this function should be optimized to avoid extra copying.
 */
-local int deflate_stored(s, flush)
+local block_state deflate_stored(s, flush)
    deflate_state *s;
    int flush;
 {
@@ -939,7 +965,7 @@ local int deflate_stored(s, flush)
                   s->block_start >= (long)s->w_size, "slide too late");
            fill_window(s);
-            if (s->lookahead == 0 && flush == Z_NO_FLUSH) return 1;
+            if (s->lookahead == 0 && flush == Z_NO_FLUSH) return need_more;
            if (s->lookahead == 0) break; /* flush the current block */
        }
@@ -961,17 +987,17 @@ local int deflate_stored(s, flush)
        }
    }
    FLUSH_BLOCK(s, flush == Z_FINISH);
-    return 0; /* normal exit */
+    return flush == Z_FINISH ? finish_done : block_done;
 }
 /* ===========================================================================
- * Compress as much as possible from the input stream, return true if
+ * Compress as much as possible from the input stream, return the current
- * processing was terminated prematurely (no more input or output space).
+ * block state.
 * This function does not perform lazy evaluation of matches and inserts
 * new strings in the dictionary only for unmatched strings or for short
 * matches. It is used only for the fast compression options.
 */
-local int deflate_fast(s, flush)
+local block_state deflate_fast(s, flush)
    deflate_state *s;
    int flush;
 {
@@ -986,8 +1012,9 @@ local int deflate_fast(s, flush)
         */
        if (s->lookahead < MIN_LOOKAHEAD) {
            fill_window(s);
-            if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) return 1;
+            if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
+                return need_more;
+            }
            if (s->lookahead == 0) break; /* flush the current block */
        }
@@ -1055,7 +1082,7 @@ local int deflate_fast(s, flush)
        if (bflush) FLUSH_BLOCK(s, 0);
    }
    FLUSH_BLOCK(s, flush == Z_FINISH);
-    return 0; /* normal exit */
+    return flush == Z_FINISH ? finish_done : block_done;
 }
 /* ===========================================================================
@@ -1063,7 +1090,7 @@ local int deflate_fast(s, flush)
 * evaluation for matches: a match is finally adopted only if there is
 * no better match at the next window position.
 */
-local int deflate_slow(s, flush)
+local block_state deflate_slow(s, flush)
    deflate_state *s;
    int flush;
 {
@@ -1079,8 +1106,9 @@ local int deflate_slow(s, flush)
         */
        if (s->lookahead < MIN_LOOKAHEAD) {
            fill_window(s);
-            if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) return 1;
+            if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
+                return need_more;
+            }
            if (s->lookahead == 0) break; /* flush the current block */
        }
@@ -1158,7 +1186,7 @@ local int deflate_slow(s, flush)
            }
            s->strstart++;
            s->lookahead--;
-            if (s->strm->avail_out == 0) return 1;
+            if (s->strm->avail_out == 0) return need_more;
        } else {
            /* There is no previous match to compare with, wait for
             * the next step to decide.
@@ -1175,6 +1203,5 @@ local int deflate_slow(s, flush)
        s->match_available = 0;
    }
    FLUSH_BLOCK(s, flush == Z_FINISH);
-    return 0;
+    return flush == Z_FINISH ? finish_done : block_done;
 }
diff --git a/deflate.h b/deflate.h
index 95ca0c2..a7daf7f 100644
--- a/deflate.h
+++ b/deflate.h
@@ -8,7 +8,7 @@
   subject to change. Applications should only use zlib.h.
 */
-/* $Id: deflate.h,v 1.9 1996/01/30 21:59:13 me Exp $ */
+/* $Id: deflate.h,v 1.10 1996/07/02 12:41:00 me Exp $ */
 #ifndef _DEFLATE_H
 #define _DEFLATE_H
@@ -80,7 +80,7 @@ typedef unsigned IPos;
 */
 typedef struct internal_state {
-    z_stream *strm;      /* pointer back to this zlib stream */
+    z_streamp strm;      /* pointer back to this zlib stream */
    int   status;        /* as the name implies */
    Bytef *pending_buf;  /* output still pending */
    Bytef *pending_out;  /* next pending byte to output to the stream */
diff --git a/gzio.c b/gzio.c
index 44ca9e8..6c82677 100644
--- a/gzio.c
+++ b/gzio.c
@@ -3,7 +3,7 @@
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
-/* $Id: gzio.c,v 1.13 1996/05/22 11:52:24 me Exp $ */
+/* $Id: gzio.c,v 1.14 1996/07/24 13:41:01 me Exp $ */
 #include <stdio.h>
@@ -496,7 +496,7 @@ int gzclose (file)
   errnum is set to Z_ERRNO and the application may consult errno
   to get the exact error code.
 */
-char*  gzerror (file, errnum)
+const char*  gzerror (file, errnum)
    gzFile file;
    int *errnum;
 {
@@ -505,19 +505,19 @@ char*  gzerror (file, errnum)
    if (s == NULL) {
        *errnum = Z_STREAM_ERROR;
-        return ERR_MSG(Z_STREAM_ERROR);
+        return (const char*)ERR_MSG(Z_STREAM_ERROR);
    }
    *errnum = s->z_err;
-    if (*errnum == Z_OK) return (char*)"";
+    if (*errnum == Z_OK) return (const char*)"";
    m =  (char*)(*errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg);
-    if (m == NULL || *m == '\0') m = ERR_MSG(s->z_err);
+    if (m == NULL || *m == '\0') m = (char*)ERR_MSG(s->z_err);
    TRYFREE(s->msg);
    s->msg = (char*)ALLOC(strlen(s->path) + strlen(m) + 3);
    strcpy(s->msg, s->path);
    strcat(s->msg, ": ");
    strcat(s->msg, m);
-    return s->msg;
+    return (const char*)s->msg;
 }
diff --git a/infblock.c b/infblock.c
index 733e983..cc2e674 100644
--- a/infblock.c
+++ b/infblock.c
@@ -63,7 +63,7 @@ local uInt border[] = { /* Order of the bit length code lengths */
 void inflate_blocks_reset(s, z, c)
 inflate_blocks_statef *s;
-z_stream *z;
+z_streamp z;
 uLongf *c;
 {
  if (s->checkfn != Z_NULL)
@@ -87,7 +87,7 @@ uLongf *c;
 inflate_blocks_statef *inflate_blocks_new(z, c, w)
-z_stream *z;
+z_streamp z;
 check_func c;
 uInt w;
 {
@@ -115,7 +115,7 @@ uInt w;
 #endif
 int inflate_blocks(s, z, r)
 inflate_blocks_statef *s;
-z_stream *z;
+z_streamp z;
 int r;
 {
  uInt t;               /* temporary storage */
@@ -381,7 +381,7 @@ int r;
 int inflate_blocks_free(s, z, c)
 inflate_blocks_statef *s;
-z_stream *z;
+z_streamp z;
 uLongf *c;
 {
  inflate_blocks_reset(s, z, c);
diff --git a/infblock.h b/infblock.h
index ee2c063..3ecd50c 100644
--- a/infblock.h
+++ b/infblock.h
@@ -12,23 +12,23 @@ struct inflate_blocks_state;
 typedef struct inflate_blocks_state FAR inflate_blocks_statef;
 extern inflate_blocks_statef * inflate_blocks_new OF((
-    z_stream *z,
+    z_streamp z,
    check_func c,               /* check function */
    uInt w));                   /* window size */
 extern int inflate_blocks OF((
    inflate_blocks_statef *,
-    z_stream *,
+    z_streamp ,
    int));                      /* initial return code */
 extern void inflate_blocks_reset OF((
    inflate_blocks_statef *,
-    z_stream *,
+    z_streamp ,
    uLongf *));                  /* check value on output */
 extern int inflate_blocks_free OF((
    inflate_blocks_statef *,
-    z_stream *,
+    z_streamp ,
    uLongf *));                  /* check value on output */
 extern void inflate_set_dictionary OF((
diff --git a/infcodes.c b/infcodes.c
index 6314e80..3ae3818 100644
--- a/infcodes.c
+++ b/infcodes.c
@@ -60,7 +60,7 @@ inflate_codes_statef *inflate_codes_new(bl, bd, tl, td, z)
 uInt bl, bd;
 inflate_huft *tl;
 inflate_huft *td; /* need separate declaration for Borland C++ */
-z_stream *z;
+z_streamp z;
 {
  inflate_codes_statef *c;
@@ -80,7 +80,7 @@ z_stream *z;
 int inflate_codes(s, z, r)
 inflate_blocks_statef *s;
-z_stream *z;
+z_streamp z;
 int r;
 {
  uInt j;               /* temporary storage */
@@ -240,7 +240,7 @@ int r;
 void inflate_codes_free(c, z)
 inflate_codes_statef *c;
-z_stream *z;
+z_streamp z;
 {
  ZFREE(z, c);
  Tracev((stderr, "inflate:       codes free\n"));
diff --git a/infcodes.h b/infcodes.h
index 8671efa..c2c38df 100644
--- a/infcodes.h
+++ b/infcodes.h
@@ -14,14 +14,14 @@ typedef struct inflate_codes_state FAR inflate_codes_statef;
 extern inflate_codes_statef *inflate_codes_new OF((
    uInt, uInt,
    inflate_huft *, inflate_huft *,
-    z_stream *));
+    z_streamp ));
 extern int inflate_codes OF((
    inflate_blocks_statef *,
-    z_stream *,
+    z_streamp ,
    int));
 extern void inflate_codes_free OF((
    inflate_codes_statef *,
-    z_stream *));
+    z_streamp ));
diff --git a/inffast.c b/inffast.c
index 209c0ee..86eee4a 100644
--- a/inffast.c
+++ b/inffast.c
@@ -32,7 +32,7 @@ uInt bl, bd;
 inflate_huft *tl;
 inflate_huft *td; /* need separate declaration for Borland C++ */
 inflate_blocks_statef *s;
-z_stream *z;
+z_streamp z;
 {
  inflate_huft *t;      /* temporary pointer */
  uInt e;               /* extra bits or operation */
diff --git a/inffast.h b/inffast.h
index 843051f..8cc644e 100644
--- a/inffast.h
+++ b/inffast.h
@@ -14,4 +14,4 @@ extern int inflate_fast OF((
    inflate_huft *,
    inflate_huft *,
    inflate_blocks_statef *,
-    z_stream *));
+    z_streamp ));
diff --git a/inflate.c b/inflate.c
index 4eed100..74cc69c 100644
--- a/inflate.c
+++ b/inflate.c
@@ -49,7 +49,7 @@ struct internal_state {
 int inflateReset(z)
-z_stream *z;
+z_streamp z;
 {
  uLong c;
@@ -65,7 +65,7 @@ z_stream *z;
 int inflateEnd(z)
-z_stream *z;
+z_streamp z;
 {
  uLong c;
@@ -81,7 +81,7 @@ z_stream *z;
 int inflateInit2_(z, w, version, stream_size)
-z_stream *z;
+z_streamp z;
 int w;
 const char *version;
 int stream_size;
@@ -138,7 +138,7 @@ int stream_size;
 int inflateInit_(z, version, stream_size)
-z_stream *z;
+z_streamp z;
 const char *version;
 int stream_size;
 {
@@ -150,7 +150,7 @@ int stream_size;
 #define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)
 int inflate(z, f)
-z_stream *z;
+z_streamp z;
 int f;
 {
  int r;
@@ -272,7 +272,7 @@ int f;
 int inflateSetDictionary(z, dictionary, dictLength)
-z_stream *z;
+z_streamp z;
 const Bytef *dictionary;
 uInt  dictLength;
 {
@@ -280,6 +280,7 @@ uInt  dictLength;
  if (z == Z_NULL || z->state == Z_NULL || z->state->mode != DICT0)
    return Z_STREAM_ERROR;
  if (adler32(1L, dictionary, dictLength) != z->adler) return Z_DATA_ERROR;
  z->adler = 1L;
@@ -295,7 +296,7 @@ uInt  dictLength;
 int inflateSync(z)
-z_stream *z;
+z_streamp z;
 {
  uInt n;       /* number of bytes to look at */
  Bytef *p;     /* pointer to bytes */
diff --git a/inftrees.c b/inftrees.c
index ebeac0d..90205bd 100644
--- a/inftrees.c
+++ b/inftrees.c
@@ -6,7 +6,7 @@
 #include "zutil.h"
 #include "inftrees.h"
-char inflate_copyright[] = " inflate 1.0.2 Copyright 1995-1996 Mark Adler ";
+char inflate_copyright[] = " inflate 1.0.4 Copyright 1995-1996 Mark Adler ";
 /*
  If you use the zlib library in a product, an acknowledgment is welcome
  in the documentation of your product. If for some reason you cannot
@@ -30,7 +30,7 @@ local int huft_build OF((
    uIntf *,            /* list of extra bits for non-simple codes */
    inflate_huft * FAR*,/* result: starting table */
    uIntf *,            /* maximum lookup bits (returns actual) */
-    z_stream *));       /* for zalloc function */
+    z_streamp ));       /* for zalloc function */
 local voidpf falloc OF((
    voidpf,             /* opaque pointer (not used) */
@@ -103,7 +103,7 @@ uIntf *d;               /* list of base values for non-simple codes */
 uIntf *e;               /* list of extra bits for non-simple codes */  
 inflate_huft * FAR *t;  /* result: starting table */
 uIntf *m;               /* maximum lookup bits, returns actual */
-z_stream *zs;           /* for zalloc function */
+z_streamp zs;           /* for zalloc function */
 /* Given a list of code lengths and a maximum table size, make a set of
   tables to decode that set of codes.  Return Z_OK on success, Z_BUF_ERROR
   if the given code set is incomplete (the tables are still built in this
@@ -302,7 +302,7 @@ int inflate_trees_bits(c, bb, tb, z)
 uIntf *c;               /* 19 code lengths */
 uIntf *bb;              /* bits tree desired/actual depth */
 inflate_huft * FAR *tb; /* bits tree result */
-z_stream *z;            /* for zfree function */
+z_streamp z;            /* for zfree function */
 {
  int r;
@@ -327,7 +327,7 @@ uIntf *bl;              /* literal desired/actual bit depth */
 uIntf *bd;              /* distance desired/actual bit depth */
 inflate_huft * FAR *tl; /* literal/length tree result */
 inflate_huft * FAR *td; /* distance tree result */
-z_stream *z;            /* for zfree function */
+z_streamp z;            /* for zfree function */
 {
  int r;
@@ -442,7 +442,7 @@ inflate_huft * FAR *td;  /* distance tree result */
 int inflate_trees_free(t, z)
 inflate_huft *t;        /* table to free */
-z_stream *z;            /* for zfree function */
+z_streamp z;            /* for zfree function */
 /* Free the malloc'ed tables built by huft_build(), which makes a linked
   list of the tables it made, with the links in a dummy first entry of
   each table. */
diff --git a/inftrees.h b/inftrees.h
index 0f0ca2b..b06613d 100644
--- a/inftrees.h
+++ b/inftrees.h
@@ -35,7 +35,7 @@ extern int inflate_trees_bits OF((
    uIntf *,                    /* 19 code lengths */
    uIntf *,                    /* bits tree desired/actual depth */
    inflate_huft * FAR *,       /* bits tree result */
-    z_stream *));               /* for zalloc, zfree functions */
+    z_streamp ));               /* for zalloc, zfree functions */
 extern int inflate_trees_dynamic OF((
    uInt,                       /* number of literal/length codes */
@@ -45,7 +45,7 @@ extern int inflate_trees_dynamic OF((
    uIntf *,                    /* distance desired/actual bit depth */
    inflate_huft * FAR *,       /* literal/length tree result */
    inflate_huft * FAR *,       /* distance tree result */
-    z_stream *));               /* for zalloc, zfree functions */
+    z_streamp ));               /* for zalloc, zfree functions */
 extern int inflate_trees_fixed OF((
    uIntf *,                    /* literal desired/actual bit depth */
@@ -55,5 +55,5 @@ extern int inflate_trees_fixed OF((
 extern int inflate_trees_free OF((
    inflate_huft *,             /* tables to free */
-    z_stream *));               /* for zfree function */
+    z_streamp ));               /* for zfree function */
diff --git a/infutil.c b/infutil.c
index b56f8cd..eb21199 100644
--- a/infutil.c
+++ b/infutil.c
@@ -22,7 +22,7 @@ uInt inflate_mask[17] = {
 /* copy as much as possible from the sliding window to the output area */
 int inflate_flush(s, z, r)
 inflate_blocks_statef *s;
-z_stream *z;
+z_streamp z;
 int r;
 {
  uInt n;
diff --git a/infutil.h b/infutil.h
index ff7ac15..702cd29 100644
--- a/infutil.h
+++ b/infutil.h
@@ -91,7 +91,7 @@ extern uInt inflate_mask[17];
 /* copy as much as possible from the sliding window to the output area */
 extern int inflate_flush OF((
    inflate_blocks_statef *,
-    z_stream *,
+    z_streamp ,
    int));
 struct internal_state      {int dummy;}; /* for buggy compilers */
diff --git a/minigzip.c b/minigzip.c
index bd0735b..fcee6a2 100644
--- a/minigzip.c
+++ b/minigzip.c
@@ -13,7 +13,7 @@
 * or in pipe mode.
 */
-/* $Id: minigzip.c,v 1.9 1996/05/22 11:52:32 me Exp $ */
+/* $Id: minigzip.c,v 1.10 1996/07/24 13:41:04 me Exp $ */
 #include <stdio.h>
 #include "zlib.h"
@@ -37,7 +37,14 @@
 #ifdef VMS
 #  define unlink delete
 #  define GZ_SUFFIX "-gz"
-#else
+#endif
+#ifdef RISCOS
+#  define unlink remove
+#  define GZ_SUFFIX "-gz"
+#  define fileno(file) file->__file
+#endif
+#ifndef GZ_SUFFIX
 #  define GZ_SUFFIX ".gz"
 #endif
 #define SUFFIX_LEN sizeof(GZ_SUFFIX)
diff --git a/trees.c b/trees.c
index f943d06..4c4d6f2 100644
--- a/trees.c
+++ b/trees.c
@@ -29,7 +29,7 @@
 *          Addison-Wesley, 1983. ISBN 0-201-06672-6.
 */
-/* $Id: trees.c,v 1.10 1996/05/22 11:52:34 me Exp $ */
+/* $Id: trees.c,v 1.11 1996/07/24 13:41:06 me Exp $ */
 #include "deflate.h"
@@ -154,7 +154,7 @@ local void copy_block     OF((deflate_state *s, charf *buf, unsigned len,
 #else /* DEBUG */
 #  define send_code(s, c, tree) \
-     { if (verbose>1) fprintf(stderr,"\ncd %3d ",(c)); \
+     { if (verbose>2) fprintf(stderr,"\ncd %3d ",(c)); \
       send_bits(s, tree[c].Code, tree[c].Len); }
 #endif
diff --git a/zconf.h b/zconf.h
index 69aa21b..5f6e887 100644
--- a/zconf.h
+++ b/zconf.h
@@ -3,7 +3,7 @@
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
-/* $Id: zconf.h,v 1.18 1996/05/23 16:51:18 me Exp $ */
+/* $Id: zconf.h,v 1.20 1996/07/02 15:09:28 me Exp $ */
 #ifndef _ZCONF_H
 #define _ZCONF_H
@@ -49,8 +49,10 @@
 #if (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32)
 #  define WIN32
 #endif
-#if (defined(__GNUC__) || defined(WIN32)) && !defined(__32BIT__)
+#if defined(__GNUC__) || defined(WIN32) || defined(__386__) || defined(i386)
-#  define __32BIT__
+#  ifndef __32BIT__
+#    define __32BIT__
+#  endif
 #endif
 #if defined(__MSDOS__) && !defined(MSDOS)
 #  define MSDOS
@@ -80,9 +82,9 @@
 #  endif
 #endif
-#ifdef  __MWERKS__ /* Metrowerks CodeWarrior declares fileno() in unix.h */
+/* Some Mac compilers merge all .h files incorrectly: */
-#  include <unix.h>
+#if defined(__MWERKS__) || defined(applec) ||defined(THINK_C) ||defined(__SC__)
-#  define NO_DUMMY_DECL /* buggy compiler merges all .h files incorrectly */
+#  define NO_DUMMY_DECL
 #endif
 /* Maximum value for memLevel in deflateInit2 */
@@ -146,12 +148,6 @@
 #ifndef FAR
 #   define FAR
 #endif
-/* The Watcom compiler defines M_I86SM and __SMALL__ even in 32 bit mode */
-#if defined(__WATCOMC__) && defined(__386__) && defined(SMALL_MEDIUM)
-#  undef FAR
-#  define FAR
-#  undef SMALL_MEDIUM
-#endif
 typedef unsigned char  Byte;  /* 8 bits */
 typedef unsigned int   uInt;  /* 16 bits or more */
diff --git a/zlib.def b/zlib.def
index 0f5049f..08c6d55 100644
--- a/zlib.def
+++ b/zlib.def
@@ -8,7 +8,7 @@ SUBSYSTEM	WINDOWS
 STUB            'WINSTUB.EXE'
-VERSION         1.0.2
+VERSION         1.04
 CODE             EXECUTE READ
diff --git a/zlib.h b/zlib.h
index 1e61491..337fe9f 100644
--- a/zlib.h
+++ b/zlib.h
@@ -1,5 +1,5 @@
 /* zlib.h -- interface of the 'zlib' general purpose compression library
-  version 1.0.2, May 23rd, 1996.
+  version 1.0.4, Jul 24th, 1996.
  Copyright (C) 1995-1996 Jean-loup Gailly and Mark Adler
@@ -37,7 +37,7 @@ extern "C" {
 #include "zconf.h"
-#define ZLIB_VERSION "1.0.2"
+#define ZLIB_VERSION "1.0.4"
 /* 
     The 'zlib' compression library provides in-memory compression and
@@ -89,6 +89,8 @@ typedef struct z_stream_s {
    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
@@ -166,7 +168,7 @@ typedef struct z_stream_s {
                        /* basic functions */
-extern char EXPORT *zlibVersion OF((void));
+extern const char * EXPORT zlibVersion OF((void));
 /* 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.
@@ -174,7 +176,7 @@ extern char EXPORT *zlibVersion OF((void));
 */
 /* 
-extern int EXPORT deflateInit OF((z_stream *strm, int level));
+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.
@@ -196,7 +198,7 @@ extern int EXPORT deflateInit OF((z_stream *strm, int level));
 */
-extern int EXPORT deflate OF((z_stream *strm, int flush));
+extern int EXPORT deflate OF((z_streamp strm, int flush));
 /*
  Performs one or both of the following actions:
@@ -239,8 +241,8 @@ extern int EXPORT deflate OF((z_stream *strm, int 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, all pending input is processed,
+    If the parameter flush is set to Z_FINISH, pending input is processed,
-  all pending output is flushed and deflate returns with Z_STREAM_END if there
+  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
@@ -265,7 +267,7 @@ extern int EXPORT deflate OF((z_stream *strm, int flush));
 */
-extern int EXPORT deflateEnd OF((z_stream *strm));
+extern int EXPORT deflateEnd OF((z_streamp strm));
 /*
     All dynamically allocated data structures for this stream are freed.
   This function discards any unprocessed input and does not flush any
@@ -280,7 +282,7 @@ extern int EXPORT deflateEnd OF((z_stream *strm));
 /* 
-extern int EXPORT inflateInit OF((z_stream *strm));
+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
@@ -295,7 +297,7 @@ extern int EXPORT inflateInit OF((z_stream *strm));
 */
-extern int EXPORT inflate OF((z_stream *strm, int flush));
+extern int EXPORT inflate OF((z_streamp strm, int flush));
 /*
  Performs one or both of the following actions:
@@ -350,7 +352,7 @@ extern int EXPORT inflate OF((z_stream *strm, int flush));
 */
-extern int EXPORT inflateEnd OF((z_stream *strm));
+extern int EXPORT inflateEnd OF((z_streamp strm));
 /*
     All dynamically allocated data structures for this stream are freed.
   This function discards any unprocessed input and does not flush any
@@ -368,7 +370,7 @@ extern int EXPORT inflateEnd OF((z_stream *strm));
 */
 /*   
-extern int EXPORT deflateInit2 OF((z_stream *strm,
+extern int EXPORT deflateInit2 OF((z_streamp strm,
                                   int  level,
                                   int  method,
                                   int  windowBits,
@@ -426,7 +428,7 @@ extern int EXPORT deflateInit2 OF((z_stream *strm,
   deflate(). 
 */
                            
-extern int EXPORT deflateSetDictionary OF((z_stream *strm,
+extern int EXPORT deflateSetDictionary OF((z_streamp strm,
                                           const Bytef *dictionary,
                                           uInt  dictLength));
 /*
@@ -455,8 +457,8 @@ extern int EXPORT deflateSetDictionary OF((z_stream *strm,
   be done by deflate(). 
 */
-extern int EXPORT deflateCopy OF((z_stream *dest,
+extern int EXPORT deflateCopy OF((z_streamp dest,
-                                  z_stream *source));
+                                  z_streamp source));
 /*
     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
@@ -478,7 +480,7 @@ extern int EXPORT deflateCopy OF((z_stream *dest,
   destination.
 */
-extern int EXPORT deflateReset OF((z_stream *strm));
+extern int EXPORT deflateReset OF((z_streamp strm));
 /*
     This function is equivalent to deflateEnd followed by deflateInit,
   but does not free and reallocate all the internal compression state.
@@ -489,7 +491,7 @@ extern int EXPORT deflateReset OF((z_stream *strm));
   stream state was inconsistent (such as zalloc or state being NULL).
 */
-extern int EXPORT deflateParams OF((z_stream *strm, int level, int strategy));
+extern int EXPORT deflateParams OF((z_streamp strm, int level, int strategy));
 /*
     Dynamically update the compression level and compression strategy.
   This can be used to switch between compression and straight copy of
@@ -508,7 +510,7 @@ extern int EXPORT deflateParams OF((z_stream *strm, int level, int strategy));
 */
 /*   
-extern int EXPORT inflateInit2 OF((z_stream *strm,
+extern int EXPORT inflateInit2 OF((z_streamp strm,
                                   int  windowBits));
     This is another version of inflateInit with more compression options. The
@@ -542,7 +544,7 @@ extern int EXPORT inflateInit2 OF((z_stream *strm,
   inflate().
 */
-extern int EXPORT inflateSetDictionary OF((z_stream *strm,
+extern int EXPORT inflateSetDictionary OF((z_streamp strm,
                                           const Bytef *dictionary,
                                           uInt  dictLength));
 /*
@@ -561,7 +563,7 @@ extern int EXPORT inflateSetDictionary OF((z_stream *strm,
   inflate().
 */
-extern int EXPORT inflateSync OF((z_stream *strm));
+extern int EXPORT inflateSync OF((z_streamp strm));
 /* 
    Skips invalid compressed data until the special marker (see deflate()
  above) can be found, or until all available input is skipped. No output
@@ -576,7 +578,7 @@ extern int EXPORT inflateSync OF((z_stream *strm));
  until success or end of the input data.
 */
-extern int EXPORT inflateReset OF((z_stream *strm));
+extern int EXPORT inflateReset OF((z_streamp strm));
 /*
     This function is equivalent to inflateEnd followed by inflateInit,
   but does not free and reallocate all the internal decompression state.
@@ -690,7 +692,7 @@ extern int EXPORT    gzclose OF((gzFile file));
   error number (see function gzerror below).
 */
-extern char EXPORT  *gzerror OF((gzFile file, int *errnum));
+extern const char * EXPORT gzerror OF((gzFile file, int *errnum));
 /*
     Returns the error message for the last error which occurred on the
   given compressed file. errnum is set to zlib error number. If an
@@ -746,14 +748,14 @@ extern uLong EXPORT crc32   OF((uLong crc, const Bytef *buf, uInt len));
 /* deflateInit and inflateInit are macros to allow checking the zlib version
 * and the compiler's view of z_stream:
 */
-extern int EXPORT deflateInit_ OF((z_stream *strm, int level,
+extern int EXPORT deflateInit_ OF((z_streamp strm, int level,
                                   const char *version, int stream_size));
-extern int EXPORT inflateInit_ OF((z_stream *strm,
+extern int EXPORT inflateInit_ OF((z_streamp strm,
                                   const char *version, int stream_size));
-extern int EXPORT deflateInit2_ OF((z_stream *strm, int  level, int  method,
+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_stream *strm, int  windowBits,
+extern int EXPORT inflateInit2_ OF((z_streamp strm, int  windowBits,
                                    const char *version, int stream_size));
 #define deflateInit(strm, level) \
        deflateInit_((strm), (level),       ZLIB_VERSION, sizeof(z_stream))
diff --git a/zlib.rc b/zlib.rc
index 5e1d0f7..2c0a3e4 100644
--- a/zlib.rc
+++ b/zlib.rc
@@ -2,8 +2,8 @@
 #define IDR_VERSION1  1
 IDR_VERSION1    VERSIONINFO     MOVEABLE IMPURE LOADONCALL DISCARDABLE
-  FILEVERSION    1,0,2,0
+  FILEVERSION    1,0,4,0
-  PRODUCTVERSION 1,0,2,0
+  PRODUCTVERSION 1,0,4,0
  FILEFLAGSMASK VS_FFI_FILEFLAGSMASK
  FILEFLAGS     0
  FILEOS        VOS_DOS_WINDOWS32
@@ -17,7 +17,7 @@ BEGIN
    BEGIN
      VALUE "FileDescription", "zlib data compression library\0"
-      VALUE "FileVersion",      "1.0.2\0"
+      VALUE "FileVersion",      "1.0.4\0"
      VALUE "InternalName",     "zlib\0"
      VALUE "OriginalFilename", "zlib.lib\0"
      VALUE "ProductName",      "ZLib.DLL\0"
diff --git a/zutil.c b/zutil.c
index f32fda5..734e275 100644
--- a/zutil.c
+++ b/zutil.c
@@ -3,7 +3,7 @@
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
-/* $Id: zutil.c,v 1.15 1996/05/23 17:11:36 me Exp $ */
+/* $Id: zutil.c,v 1.17 1996/07/24 13:41:12 me Exp $ */
 #include <stdio.h>
@@ -28,17 +28,19 @@ const char *z_errmsg[10] = {
 ""};
-char *zlibVersion()
+const char *zlibVersion()
 {
    return ZLIB_VERSION;
 }
+#ifdef DEBUG
 void z_error (m)
    char *m;
 {
    fprintf(stderr, "%s\n", m);
    exit(1);
 }
+#endif
 #ifndef HAVE_MEMCPY
@@ -53,6 +55,19 @@ void zmemcpy(dest, source, len)
    } while (--len != 0);
 }
+int zmemcmp(s1, s2, len)
+    Bytef* s1;
+    Bytef* s2;
+    uInt  len;
+{
+    uInt j;
+    for (j = 0; j < len; j++) {
+        if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
+    }
+    return 0;
+}
 void zmemzero(dest, len)
    Bytef* dest;
    uInt  len;
@@ -138,14 +153,14 @@ void  zcfree (voidpf opaque, voidpf ptr)
        return;
    }
    ptr = opaque; /* just to make some compilers happy */
-    z_error("zcfree: ptr not found");
+    Assert(0, "zcfree: ptr not found");
 }
 #endif
 #endif /* __TURBOC__ */
-#if defined(M_I86) && !(defined(__WATCOMC__) && defined(__386__))
+#if defined(M_I86) && !defined(__32BIT__)
-/* Microsoft C */
+/* Microsoft C in 16-bit mode */
 #  define MY_ZCALLOC
diff --git a/zutil.h b/zutil.h
index 5a53321..c81a9f9 100644
--- a/zutil.h
+++ b/zutil.h
@@ -8,14 +8,14 @@
   subject to change. Applications should only use zlib.h.
 */
-/* $Id: zutil.h,v 1.14 1996/05/22 11:52:40 me Exp $ */
+/* $Id: zutil.h,v 1.16 1996/07/24 13:41:13 me Exp $ */
 #ifndef _Z_UTIL_H
 #define _Z_UTIL_H
 #include "zlib.h"
-#if defined(MSDOS) || defined(VMS) || defined(CRAY) || defined(WIN32)
+#if defined(MSDOS)||defined(VMS)||defined(CRAY)||defined(WIN32)||defined(RISCOS)
 #   include <stddef.h>
 #   include <errno.h>
 #else
@@ -40,10 +40,10 @@ typedef unsigned long  ulg;
 extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 /* (size given to avoid silly warnings with Visual C++) */
-#define ERR_MSG(err) (char*)z_errmsg[Z_NEED_DICT-(err)]
+#define ERR_MSG(err) z_errmsg[Z_NEED_DICT-(err)]
 #define ERR_RETURN(strm,err) \
-  return (strm->msg = ERR_MSG(err), (err))
+  return (strm->msg = (char*)ERR_MSG(err), (err))
 /* To be used only when the state is known to be valid */
        /* common constants */
@@ -116,7 +116,7 @@ extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 #  define OS_CODE  0x0a
 #endif
-#ifdef _BEOS_
+#if defined(_BEOS_) || defined(RISCOS)
 #  define fdopen(fd,mode) NULL /* No fdopen() */
 #endif
@@ -163,6 +163,7 @@ extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 #  endif
 #else
   extern void zmemcpy  OF((Bytef* dest, Bytef* source, uInt len));
+   extern int  zmemcmp  OF((Bytef* s1,   Bytef* s2, uInt len));
   extern void zmemzero OF((Bytef* dest, uInt len));
 #endif
@@ -172,6 +173,7 @@ extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 #  ifndef verbose
 #    define verbose 0
 #  endif
+   extern void z_error    OF((char *m));
 #  define Assert(cond,msg) {if(!(cond)) z_error(msg);}
 #  define Trace(x) fprintf x
 #  define Tracev(x) {if (verbose) fprintf x ;}
@@ -190,8 +192,6 @@ extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 typedef uLong (*check_func) OF((uLong check, const Bytef *buf, uInt len));
-extern void z_error    OF((char *m));
 voidpf zcalloc OF((voidpf opaque, unsigned items, unsigned size));
 void   zcfree  OF((voidpf opaque, voidpf ptr));