zlib 0.95

ChangeLog

@@ -1,6 +1,16 @@
 
 		ChangeLog file for zlib
 
+Changes in 0.95 (16 Aug 95)
+- fix MSDOS small and medium model (now easier to adapt to any compiler)
+- inlined send_bits
+- fix the final (:-) bug for deflate with flush (output was correct but
+  not completely flushed in rare occasions).
+- default window size is same for compression and decompression
+  (it's now sufficient to set MAX_WBITS in zconf.h).
+- voidp -> voidpf and voidnp -> voidp (for consistency with other
+  typedefs and because voidnp was not near in large model).
+
 Changes in 0.94 (13 Aug 95)
 - support MSDOS medium model
 - fix deflate with flush (could sometimes generate bad output)
@@ -10,6 +20,7 @@ Changes in 0.94 (13 Aug 95)
 - gzflush now calls fflush
 - For deflate with flush, flush even if no more input is provided.
 - rename libgz.a as libz.a
+- avoid complex expression in infcodes.c triggering Turbo C bug
 - work around a problem with gcc on Alpha (in INSERT_STRING)
 - don't use inline functions (problem with some gcc versions)
 - allow renaming of Byte, uInt, etc... with #define.

Makefile.bor

@@ -2,6 +2,7 @@
 # Borland C++   ************ UNTESTED ***********
 
 # To use, do "make -fmakefile.bor"
+# To compile in small model, set below: MODEL=-ms
 
 # WARNING: the small model is supported but only for small values of
 # MAX_WBITS and MAX_MEM_LEVEL. For example:

Makefile.msc

@@ -2,6 +2,7 @@
 # Microsoft C 5.1 or later
 
 # To use, do "make makefile.msc"
+# To compile in small model, set below: MODEL=-AS
 
 # If you wish to reduce the memory requirements (default 256K for big
 # objects plus a few K), you can add to CFLAGS below: 

Makefile.tc

@@ -2,17 +2,19 @@
 # TurboC 2.0
 
 # To use, do "make -fmakefile.tc"
+# To compile in small model, set below: MODEL=-ms
 
 # WARNING: the small model is supported but only for small values of
 # MAX_WBITS and MAX_MEM_LEVEL. For example:
-#    -DMAX_WBITS=11 -DDEF_WBITS=11 -DMAX_MEM_LEVEL=3
+#    -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
 # If you wish to reduce the memory requirements (default 256K for big
 # objects plus a few K), you can add to CFLAGS below: 
 #   -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
 # See zconf.h for details about the memory requirements.
 
 # ------------- Turbo C 2.0 -------------
 MODEL=-ml
+# CFLAGS=-O2 -G -Z $(MODEL) -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
 CFLAGS=-O2 -G -Z $(MODEL)
 CC=tcc -I\tc\include
 LD=tcc -L\tc\lib

README

@@ -1,38 +1,37 @@
-zlib 0.94 is a beta version of a general purpose compression library.
-Unless new bugs are found it will be released again as the first official
-version (1.0). This version has no known bugs.
+zlib 0.95 is a beta version of a general purpose compression library.
+This should be the last version before the first official
+version (1.0), so please test it now. (At least compile and run it with
+"make test"). This version has no known bugs.
 
 The data format used by the zlib library is described in the
 files zlib-3.1.doc, deflate-1.1.doc and gzip-4.1.doc, available
 in ftp.uu.net:/pub/archiving/zip/doc.
 
 All functions of the compression library are documented in the file
 zlib.h. A usage example of the library is given in the file example.c
-which also tests that the library is working correctly.
+which also tests that the library is working correctly. Another
+example is given in the file minigzip.c.
 
 To compile all files and run the test program, just type: make test
-(For MSDOS, use one of the special makefiles such as Makefile.msc.)
+(For MSDOS, use one of the special makefiles such as Makefile.msc;
+for VMS, use Make_vms.com or descrip.mms.)
 To install the zlib library (libz.a) in /usr/local/lib, type: make install
 To install in a different directory, use for example:
   make install prefix=$HOME
 This will install in $HOME/lib instead of /usr/local/lib.
 
-The changes made in version 0.94 are documented in the file ChangeLog.
-The main changes since 0.93 are:
-- support MSDOS small and medium model
-- fix deflate with flush (could sometimes generate bad output)
-- fix deflateReset (zlib header was incorrectly suppressed)
-- added support for VMS
-- allow a compression level in gzopen()
-- gzflush now calls fflush
-- For deflate with flush, flush even if no more input is provided.
-- rename libgz.a as libz.a
+The changes made in version 0.95 are documented in the file ChangeLog.
+The main changes since 0.94 are:
+- fix MSDOS small and medium model (now easier to adapt to any compiler)
+- inlined send_bits
+- fix the final (:-) bug for deflate with flush (output was correct but
+  not completely flushed in rare occasions).
 
-For MSDOS, the small and medium models are supported only for Microsoft C.
-(It should be easy to support them for Borland C also, but I don't have
-a recent Borland compiler to test with.) The small model currently works
-for Turbo/Borland C but only with reduced performance to avoid any far
-allocation (tested with -DMAX_WBITS=11 -DDEF_WBITS=11 -DMAX_MEM_LEVEL=3).
+For MSDOS, the small and medium models have been tested only with Microsoft C.
+(This should now work for Borland C also, but I don't have a recent Borland
+compiler to test with.) The small model was tested with Turbo C but only with
+reduced performance to avoid any far allocation; it was tested with
+ -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
 
 
  (C) 1995 Jean-loup Gailly and Mark Adler

deflate.c

@@ -524,8 +524,8 @@ local int longest_match(s, cur_match)
      * Try with and without -DUNALIGNED_OK to check.
      */
     register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1;
-    register ush scan_start = *(ush*)scan;
-    register ush scan_end   = *(ush*)(scan+best_len-1);
+    register ush scan_start = *(ushf*)scan;
+    register ush scan_end   = *(ushf*)(scan+best_len-1);
 #else
     register Bytef *strend = s->window + s->strstart + MAX_MATCH;
     register Byte scan_end1  = scan[best_len-1];
@@ -554,8 +554,8 @@ local int longest_match(s, cur_match)
         /* This code assumes sizeof(unsigned short) == 2. Do not use
          * UNALIGNED_OK if your compiler uses a different size.
          */
-        if (*(ush*)(match+best_len-1) != scan_end ||
-            *(ush*)match != scan_start) continue;
+        if (*(ushf*)(match+best_len-1) != scan_end ||
+            *(ushf*)match != scan_start) continue;
 
         /* It is not necessary to compare scan[2] and match[2] since they are
          * always equal when the other bytes match, given that the hash keys
@@ -569,10 +569,10 @@ local int longest_match(s, cur_match)
         Assert(scan[2] == match[2], "scan[2]?");
         scan++, match++;
         do {
-        } while (*(ush*)(scan+=2) == *(ush*)(match+=2) &&
-                 *(ush*)(scan+=2) == *(ush*)(match+=2) &&
-                 *(ush*)(scan+=2) == *(ush*)(match+=2) &&
-                 *(ush*)(scan+=2) == *(ush*)(match+=2) &&
+        } while (*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
+                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
+                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
+                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
                  scan < strend);
         /* The funny "do {}" generates better code on most compilers */
 
@@ -621,7 +621,7 @@ local int longest_match(s, cur_match)
             best_len = len;
             if (len >= s->nice_match) break;
 #ifdef UNALIGNED_OK
-            scan_end = *(ush*)(scan+best_len-1);
+            scan_end = *(ushf*)(scan+best_len-1);
 #else
             scan_end1  = scan[best_len-1];
             scan_end   = scan[best_len];

deflate.h

@@ -233,6 +233,7 @@ typedef struct internal_state {
     ulg static_len;     /* bit length of current block with static trees */
     ulg compressed_len; /* total bit length of compressed file */
     uInt matches;       /* number of string matches in current block */
+    int last_eob_len;   /* bit length of EOB code for last block */
 
 #ifdef DEBUG
     ulg bits_sent;      /* bit length of the compressed data */

example.c

@@ -277,7 +277,7 @@ int main(argc, argv)
         fprintf(stderr, "incompatible zlib version\n");
         exit(1);
 
-    } else if (zstrcmp(zlib_version, ZLIB_VERSION) != 0) {
+    } else if (strcmp(zlib_version, ZLIB_VERSION) != 0) {
         fprintf(stderr, "warning: different zlib version\n");
     }
     test_compress();

gzio.c

@@ -234,7 +234,7 @@ gzFile gzdopen (fd, mode)
 */
 int gzread (file, buf, len)
     gzFile file;
-    voidnp buf;
+    voidp buf;
     unsigned len;
 {
     gz_stream *s = (gz_stream*)file;
@@ -292,7 +292,7 @@ int gzread (file, buf, len)
 */
 int gzwrite (file, buf, len)
     gzFile file;
-    voidnp buf;
+    voidp buf;
     unsigned len;
 {
     gz_stream *s = (gz_stream*)file;

inftrees.c

@@ -25,14 +25,14 @@ local int huft_build OF((
     uIntf *,            /* maximum lookup bits (returns actual) */
     z_stream *));       /* for zalloc function */
 
-local voidp falloc OF((
-    voidp,              /* opaque pointer (not used) */
+local voidpf falloc OF((
+    voidpf,             /* opaque pointer (not used) */
     uInt,               /* number of items */
     uInt));             /* size of item */
 
 local void ffree OF((
-    voidp q,            /* opaque pointer (not used) */
-    voidp p));          /* what to free (not used) */
+    voidpf q,            /* opaque pointer (not used) */
+    voidpf p));          /* what to free (not used) */
 
 /* Tables for deflate from PKZIP's appnote.txt. */
 local uInt cplens[] = { /* Copy lengths for literal codes 257..285 */
@@ -377,22 +377,22 @@ local inflate_huft *fixed_tl;
 local inflate_huft *fixed_td;
 
 
-local voidp falloc(q, n, s)
-voidp q;        /* opaque pointer (not used) */
+local voidpf falloc(q, n, s)
+voidpf q;        /* opaque pointer (not used) */
 uInt n;         /* number of items */
 uInt s;         /* size of item */
 {
   Assert(s == sizeof(inflate_huft) && n <= fixed_left,
          "inflate_trees falloc overflow");
   if (q) s++; /* to make some compilers happy */
   fixed_left -= n;
-  return (voidp)(fixed_mem + fixed_left);
+  return (voidpf)(fixed_mem + fixed_left);
 }
 
 
 local void ffree(q, p)
-voidp q;
-voidp p;
+voidpf q;
+voidpf p;
 {
   Assert(0, "inflate_trees ffree called!");
   if (q) q = p; /* to make some compilers happy */