zlib 0.8v0.8

21 files changed, 186 insertions, 353 deletions

diff --git a/ChangeLog b/ChangeLog
index c0536d2..668d036 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,9 +1,14 @@
                 ChangeLog file for zlib
 
-Changes in 0.79 (28 April 95)
-- add fast inflate (inffast.c)
+Changes in 0.8 (29 April 95)
+- added fast inflate (inffast.c)
+- deflate(Z_FINISH) now returns Z_STREAM_END when done. Warning: this
+  is incompatible with previous versions of zlib which returned Z_OK.
+- work around a TurboC compiler bug (bad code for b << 0, see infutil.h)
+- gzread no longer reads one extra byte in certain cases
 - In gzio destroy(), don't reference a freed structure
 - avoid many warnings for MSDOS
+- avoid the ERROR symbol which is used by MS Windows
 
 Changes in 0.71 (14 April 95)
 - Fixed more MSDOS compilation problems :( There is still a bug with
diff --git a/README b/README
index 5705062..a8d5788 100644
--- a/README
+++ b/README
@@ -1,4 +1,6 @@
-zlib 0.79 is a beta version of a general purpose compression library.
+zlib 0.8 is a beta version of a general purpose compression library.
+This is the first version with no known bugs. (There may still be
+problem on SGI, to be checked.)
 
 The data format used by the zlib library is described in the
 file zlib-3.1.doc, deflate-1.1.doc and gzip-4.1.doc, available
@@ -9,15 +11,18 @@ zlib.h. A usage example of the library is given in the file example.c
 which also tests that the library is working correctly.
 To compile all files and run the test program, just type: make test
 
-The changes made in version 0.79 are documented in the file ChangeLog.
+The changes made in version 0.8 are documented in the file ChangeLog.
 The main changes since 0.71 are:
-- add fast inflate (inffast.c)
-- In gzio destroy(), don't reference a freed structure
-
-On MSDOS, this version works in large and small model with MSC; in
-small model only with TurboC (bug being investigated). For both
-compilers, small model compression works only for small values of
-MEM_LEVEL and WBITS (see zutil.h), and requires -DUSE_CALLOC.
+- added fast inflate (inffast.c)
+- deflate(Z_FINISH) now returns Z_STREAM_END when done. Warning: this
+  is incompatible with previous versions of zlib which returned Z_OK.
+- work around a nasty TurboC compiler bug
+
+On MSDOS, this version works in both large and small model. However
+small model compression works only for small values of MEM_LEVEL and
+WBITS (see zutil.h). Small model decompression should work up to WBITS=15.
+This version of zlib does not yet support small or medium model with
+far allocation of big objects.
 
 
   Copyright (C) 1995 Jean-loup Gailly and Mark Adler
diff --git a/compress.c b/compress.c
index 8edcb2a..762a9df 100644
--- a/compress.c
+++ b/compress.c
@@ -3,7 +3,7 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: compress.c,v 1.4 1995/04/10 15:52:04 jloup Exp $ */
+/* $Id: compress.c,v 1.5 1995/04/29 17:18:43 jloup Exp $ */
 
 #include "zlib.h"
 
@@ -44,9 +44,9 @@ int compress (dest, destLen, source, sourceLen)
     if (err != Z_OK) return err;
 
     err = deflate(&stream, Z_FINISH);
-    if (err != Z_OK) {
+    if (err != Z_STREAM_END) {
         deflateEnd(&stream);
-        return err;
+        return err == Z_OK ? Z_BUF_ERROR : err;
     }
     *destLen = stream.total_out;
 
diff --git a/deflate.c b/deflate.c
index 7d44627..e7e52af 100644
--- a/deflate.c
+++ b/deflate.c
@@ -47,7 +47,7 @@
  *
  */
 
-/* $Id: deflate.c,v 1.4 1995/04/14 19:49:46 jloup Exp $ */
+/* $Id: deflate.c,v 1.5 1995/04/29 16:52:05 jloup Exp $ */
 
 #include "deflate.h"
 
@@ -117,8 +117,10 @@ local void fill_window   __P((deflate_state *s));
 local int  deflate_fast  __P((deflate_state *s, int flush));
 local int  deflate_slow  __P((deflate_state *s, int flush));
 local void lm_init       __P((deflate_state *s));
-
 local int  longest_match __P((deflate_state *s, IPos cur_match));
+local void putShortMSB   __P((deflate_state *s, uInt b));
+local void flush_pending __P((z_stream *strm));
+local int read_buf       __P((z_stream *strm, char *buf, unsigned size));
 #ifdef ASMV
       void match_init __P((void)); /* asm code initialization */
 #endif
@@ -225,7 +227,7 @@ int deflateInit2 (strm, level, method, windowBits, memLevel, strategy)
 
     s->level = level;
     s->strategy = strategy;
-    s->method = method;
+    s->method = (Byte)method;
 
     return deflateReset(strm);
 }
@@ -265,8 +267,8 @@ local void putShortMSB (s, b)
     deflate_state *s;
     uInt b;
 {
-    put_byte(s, b >> 8);
-    put_byte(s, b & 0xff);
+    put_byte(s, (Byte)(b >> 8));
+    put_byte(s, (Byte)(b & 0xff));
 }   
 
 /* =========================================================================
@@ -346,17 +348,18 @@ int deflate (strm, flush)
     }
     Assert(strm->avail_out > 0, "bug2");
 
-    if (flush != Z_FINISH || strm->state->noheader) return Z_OK;
+    if (flush != Z_FINISH) return Z_OK;
+    if (strm->state->noheader) return Z_STREAM_END;
 
     /* Write the zlib trailer (adler32) */
-    putShortMSB(strm->state, strm->state->adler >> 16);
-    putShortMSB(strm->state, strm->state->adler & 0xffff);
+    putShortMSB(strm->state, (uInt)(strm->state->adler >> 16));
+    putShortMSB(strm->state, (uInt)(strm->state->adler & 0xffff));
     flush_pending(strm);
     /* If avail_out is zero, the application will call deflate again
      * to flush the rest.
      */
     strm->state->noheader = 1; /* write the trailer only once! */
-    return Z_OK;
+    return strm->state->pending != 0 ? Z_OK : Z_STREAM_END;
 }
 
 /* ========================================================================= */
diff --git a/example.c b/example.c
index 86541a7..5b482b8 100644
--- a/example.c
+++ b/example.c
@@ -3,11 +3,17 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: example.c,v 1.5 1995/04/14 20:35:56 jloup Exp $ */
+/* $Id: example.c,v 1.6 1995/04/29 16:53:46 jloup Exp $ */
 
 #include <stdio.h>
 #include "zlib.h"
 
+#ifdef STDC
+#  include <string.h>
+#endif
+
+extern void exit  __P((int));
+
 #define BUFLEN 4096
 
 #define local static
@@ -25,6 +31,12 @@
 
 char *hello = "hello world";
 
+void test_compress __P((void));
+void test_gzio     __P((char *out, char *in));
+void test_deflate  __P((Byte compr[]));
+void test_inflate  __P((Byte compr[]));
+void main          __P((int argc, char *argv[]));
+
 /* ===========================================================================
  * Test compress() and uncompress()
  */
@@ -37,15 +49,15 @@ void test_compress()
     int err;
     uLong len = strlen(hello)+1;
 
-    err = compress(compr, &comprLen, hello, len);
+    err = compress(compr, &comprLen, (Byte*)hello, len);
     CHECK_ERR(err, "compress");
 
-    strcpy(uncompr, "garbage");
+    strcpy((char*)uncompr, "garbage");
 
     err = uncompress(uncompr, &uncomprLen, compr, comprLen);
     CHECK_ERR(err, "uncompress");
 
-    if (strcmp(uncompr, hello)) {
+    if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad uncompress\n");
     } else {
         printf("uncompress(): %s\n", uncompr);
@@ -80,7 +92,7 @@ void test_gzio(out, in)
     if (file == NULL) {
         fprintf(stderr, "gzopen error\n");
     }
-    strcpy(uncompr, "garbage");
+    strcpy((char*)uncompr, "garbage");
 
     uncomprLen = gzread(file, uncompr, uncomprLen);
     if (uncomprLen != len) {
@@ -88,7 +100,7 @@ void test_gzio(out, in)
     }
     gzclose(file);
 
-    if (strcmp(uncompr, hello)) {
+    if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad gzread\n");
     } else {
         printf("gzread(): %s\n", uncompr);
@@ -96,9 +108,9 @@ void test_gzio(out, in)
 }
 
 /* ===========================================================================
- * Test deflate() with small buffers, return the compressed length.
+ * Test deflate() with small buffers
  */
-uLong test_deflate(compr)
+void test_deflate(compr)
     Byte compr[];
 {
     z_stream c_stream; /* compression stream */
@@ -120,16 +132,15 @@ uLong test_deflate(compr)
         CHECK_ERR(err, "deflate");
     }
     /* Finish the stream, still forcing small buffers: */
-    do {
+    for (;;) {
         c_stream.avail_out = 1;
         err = deflate(&c_stream, Z_FINISH);
+        if (err == Z_STREAM_END) break;
         CHECK_ERR(err, "deflate");
-    } while (c_stream.avail_out == 0);
+    }
 
     err = deflateEnd(&c_stream);
     CHECK_ERR(err, "deflateEnd");
-
-    return c_stream.total_out;
 }
 
 /* ===========================================================================
@@ -142,7 +153,7 @@ void test_inflate(compr)
     int err;
     z_stream d_stream; /* decompression stream */
 
-    strcpy(uncompr, "garbage");
+    strcpy((char*)uncompr, "garbage");
 
     d_stream.zalloc = (alloc_func)0;
     d_stream.zfree = (free_func)0;
@@ -163,7 +174,7 @@ void test_inflate(compr)
     err = inflateEnd(&d_stream);
     CHECK_ERR(err, "inflateEnd");
 
-    if (strcmp(uncompr, hello)) {
+    if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad inflate\n");
     } else {
         printf("inflate(): %s\n", uncompr);
@@ -179,7 +190,6 @@ void main(argc, argv)
     char *argv[];
 {
     local Byte compr[BUFLEN];
-    uLong comprLen;
 
     if (zlib_version[0] != ZLIB_VERSION[0]) {
         fprintf(stderr, "incompatible zlib version\n");
@@ -193,7 +203,7 @@ void main(argc, argv)
     test_gzio((argc > 1 ? argv[1] : "foo.gz"),
               (argc > 2 ? argv[2] : "foo.gz"));
 
-    comprLen = test_deflate(compr);
+    test_deflate(compr);
 
     test_inflate(compr);
 
diff --git a/gzio.c b/gzio.c
index 365b6f5..6c3211a 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 1.4 1995/04/14 14:50:52 jloup Exp $ */
+/* $Id: gzio.c,v 1.5 1995/04/29 17:13:56 jloup Exp $ */
 
 #include <stdio.h>
 
@@ -46,7 +46,12 @@ typedef struct gz_stream {
 } gz_stream;
 
 
-/* ===========================================================================
+local int    destroy __P((gz_stream *s));
+local gzFile gz_open __P((char *path, char *mode, int  fd));
+local void   putLong __P((FILE *file, uLong x));
+local uLong  getLong __P((Byte *buf));
+
+ /* ===========================================================================
  * Cleanup then free the given gz_stream. Return a zlib error code.
  */
 local int destroy (s)
@@ -339,7 +344,7 @@ int gzflush (file, flush)
         if (len != 0) {
             if (fwrite(s->outbuf, 1, len, s->file) != len) {
                 s->z_err = Z_ERRNO;
-                break;
+                return Z_ERRNO;
             }
             s->stream.next_out = s->outbuf;
             s->stream.avail_out = Z_BUFSIZE;
@@ -347,14 +352,14 @@ int gzflush (file, flush)
         if (done) break;
         s->z_err = deflate(&(s->stream), flush);
 
-        if (s->z_err != Z_OK) break;
-
-        /* deflate has finished flushing only when it hasn't used up
+        /* deflate has finished flushing only when it hasn't used up
          * all the available space in the output buffer: 
          */
-        done = (s->stream.avail_out != 0);
+        done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END);
+ 
+        if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break;
     }
-    return s->z_err;
+    return  s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
 }
 
 /* ===========================================================================
@@ -395,12 +400,15 @@ int gzclose (file)
     gzFile file;
 {
     uInt n;
+    int err;
     gz_stream *s = (gz_stream*)file;
 
     if (s == NULL) return Z_STREAM_ERROR;
 
     if (s->mode == 'w') {
-        gzflush (file, Z_FINISH);
+        err = gzflush (file, Z_FINISH);
+        if (err != Z_OK) return destroy(file);
+
         putLong (s->file, s->crc);
         putLong (s->file, s->stream.total_in);
 
diff --git a/infblock.c b/infblock.c
index 4d8bd48..2c2f8dd 100644
--- a/infblock.c
+++ b/infblock.c
@@ -139,7 +139,7 @@ int r;
           break;
         case 3:                         /* illegal */
           DUMPBITS(3)
-          s->mode = ERROR;
+          s->mode = INF_ERROR;
           z->msg = "invalid block type";
           r = Z_DATA_ERROR;
           LEAVE
@@ -149,7 +149,7 @@ int r;
       NEEDBITS(32)
       if ((~b) >> 16 != (b & 0xffff))
       {
-        s->mode = ERROR;
+        s->mode = INF_ERROR;
         z->msg = "invalid stored block lengths";
         r = Z_DATA_ERROR;
         LEAVE
@@ -172,7 +172,7 @@ int r;
 #ifndef PKZIP_BUG_WORKAROUND
       if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29)
       {
-        s->mode = ERROR;
+        s->mode = INF_ERROR;
         z->msg = "too many length or distance symbols";
         r = Z_DATA_ERROR;
         LEAVE
@@ -205,7 +205,7 @@ int r;
       {
         r = t;
         if (r == Z_DATA_ERROR)
-          s->mode = ERROR;
+          s->mode = INF_ERROR;
         LEAVE
       }
       s->sub.trees.index = 0;
@@ -240,7 +240,7 @@ int r;
           if (i + j > 258 + (t & 0x1f) + ((t >> 5) & 0x1f) ||
               (c == 16 && i < 1))
           {
-            s->mode = ERROR;
+            s->mode = INF_ERROR;
             z->msg = "invalid bit length repeat";
             r = Z_DATA_ERROR;
             LEAVE
@@ -267,7 +267,7 @@ int r;
         if (t != Z_OK)
         {
           if (t == (uInt)Z_DATA_ERROR)
-            s->mode = ERROR;
+            s->mode = INF_ERROR;
           r = t;
           LEAVE
         }
@@ -289,8 +289,19 @@ int r;
       r = Z_OK;
       inflate_codes_free(s->sub.codes, z);
       LOAD
-      s->mode = s->last ? DRY : TYPE;
+      if (!s->last)
+      {
+        s->mode = TYPE;
       break;
+      }
+      if (k > 7)              /* return unused byte, if any */
+      {
+        Assert(k < 16, "inflate_codes grabbed too many bytes")
+        k -= 8;
+      n++;
+      p--;                    /* can always return one */
+      }
+      s->mode = DRY;
     case DRY:
       FLUSH
       if (s->read != s->write)
@@ -299,7 +310,7 @@ int r;
     case DONE:
       r = Z_STREAM_END;
       LEAVE
-    case ERROR:
+    case INF_ERROR:
       r = Z_DATA_ERROR;
       LEAVE
     default:
@@ -309,13 +320,11 @@ int r;
 }
 
 
-int inflate_blocks_free(s, z, c, e)
+int inflate_blocks_free(s, z, c)
 struct inflate_blocks_state *s;
 z_stream *z;
 uLong *c;
-int *e;
 {
-  *e = (int)(s->bitk > 7 ? (s->bitb >> (s->bitk & 7)) & 0xff : -1);
   if (s->checkfn != Z_NULL)
     *c = s->check;
   if (s->mode == BTREE || s->mode == DTREE)
diff --git a/infblock.h b/infblock.h
index a21d730..4a9e0e2 100644
--- a/infblock.h
+++ b/infblock.h
@@ -11,9 +11,9 @@
 struct inflate_blocks_state;
 
 extern struct inflate_blocks_state * inflate_blocks_new __P((
-    z_stream *,
-    check_func checkfn,               /* check function */
-    uInt));                     /* window size */
+    z_stream *z,
+    check_func c,               /* check function */
+    uInt w));                   /* window size */
 
 extern int inflate_blocks __P((
     struct inflate_blocks_state *,
@@ -23,5 +23,4 @@ extern int inflate_blocks __P((
 extern int inflate_blocks_free __P((
     struct inflate_blocks_state *,
     z_stream *,
-    uLong *,                    /* check value on output */
-    int *));                    /* possible leftover byte to return */
+    uLong *));                        /* check value on output */
diff --git a/inffast.c b/inffast.c
index 8c3e4ce..29c97e2 100644
--- a/inffast.c
+++ b/inffast.c
@@ -8,6 +8,8 @@
 #include "infutil.h"
 #include "inffast.h"
 
+struct inflate_codes_state {int dummy;}; /* for buggy compilers */
+
 /* simplify the use of the inflate_huft type with some defines */
 #define base more.Base
 #define next more.Next
diff --git a/inflate-0.72.c b/inflate-0.72.c
deleted file mode 100644
index 56b0665..0000000
--- a/inflate-0.72.c
+++ /dev/null
@@ -1,230 +0,0 @@
-/* inflate.c -- zlib interface to inflate modules
- * Copyright (C) 1995 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h 
- */
-
-#include "zutil.h"
-#include "infblock.h"
-
-struct inflate_blocks_state {int dummy;}; /* for buggy compilers */
-
-/* inflate private state */
-struct internal_state {
-
-  /* mode */
-  enum {
-      METHOD,   /* waiting for method byte */
-      FLAG,     /* waiting for flag byte */
-      START,    /* make new blocks state */
-      BLOCKS,   /* decompressing blocks */
-      CHECK4,   /* four check bytes to go */
-      CHECK3,   /* three check bytes to go */
-      CHECK2,   /* two check bytes to go */
-      CHECK1,   /* one check byte to go */
-      DONE,     /* finished check, done */
-      ERROR}    /* got an error--stay here */
-    mode;               /* current inflate mode */
-
-  /* mode dependent information */
-  union {
-    uInt method;        /* if FLAGS, method byte */
-    struct inflate_blocks_state
-      *blocks;          /* if BLOCKS, current state */
-    struct {
-      uLong was;                /* computed check value */
-      uLong need;               /* stream check value */
-    } check;            /* if CHECK, check values to compare */
-  } sub;        /* submode */
-
-  /* mode independent information */
-  int  nowrap;          /* flag for no wrapper */
-  uInt wbits;           /* log2(window size)  (8..15, defaults to 15) */
-
-};
-
-
-int inflateInit(z)
-z_stream *z;
-{
-    return inflateInit2(z, WBITS);
-}
-
-
-int inflateInit2(z, w)
-z_stream *z;
-int w;
-{
-  /* initialize state */
-  if (z == Z_NULL)
-    return Z_STREAM_ERROR;
-  if (z->zalloc == Z_NULL) z->zalloc = zcalloc;
-  if (z->zfree == Z_NULL) z->zfree = zcfree;
-  z->total_in = z->total_out = 0;
-  z->msg = Z_NULL;
-  if ((z->state = (struct internal_state *)
-       ZALLOC(z,1,sizeof(struct internal_state))) == Z_NULL)
-    return Z_MEM_ERROR;
-  z->state->mode = METHOD;
-
-  /* handle undocumented nowrap option (no zlib header or check) */
-  z->state->nowrap = 0;
-  if (w < 0)
-  {
-    w = - w;
-    z->state->nowrap = 1;
-    z->state->mode = START;
-  }
-
-  /* set window size */
-  if (w < 8 || w > 15)
-  {
-    inflateEnd(z);
-    return Z_STREAM_ERROR;
-  }
-  z->state->wbits = w;
-  return Z_OK;
-}
-
-
-#define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)
-
-int inflate(z, f)
-z_stream *z;
-int f;
-{
-  int r;
-  uInt b;
-  uLong c;
-
-  if (z == Z_NULL || z->next_in == Z_NULL)
-    return Z_STREAM_ERROR;
-  r = Z_BUF_ERROR;
-  while (1) switch (z->state->mode)
-  {
-    case METHOD:
-      if (z->avail_in == 0) return r;  r = Z_OK;
-      if (((z->state->sub.method = NEXTBYTE) & 0xf != DEFLATED))
-      {
-        z->state->mode = ERROR;
-        z->msg = "unknown compression method";
-        return Z_DATA_ERROR;
-      }
-      if ((z->state->sub.method >> 4) > z->state->wbits)
-      {
-        z->state->mode = ERROR;
-        z->msg = "invalid window size";
-        return Z_DATA_ERROR;
-      }
-      z->state->mode = FLAG;
-    case FLAG:
-      if (z->avail_in == 0) return r;  r = Z_OK;
-      if ((b = NEXTBYTE) & 0x20)
-      {
-        z->state->mode = ERROR;
-        z->msg = "invalid reserved bit";
-        return Z_DATA_ERROR;
-      }
-      if (((z->state->sub.method << 8) + b) % 31)
-      {
-        z->state->mode = ERROR;
-        z->msg = "incorrect header check";
-        return Z_DATA_ERROR;
-      }
-      z->state->mode = START;
-    case START:
-      if ((z->state->sub.blocks =
-           inflate_blocks_new(z,1<< z->state->wbits)) == Z_NULL)
-        return Z_MEM_ERROR;
-      z->state->mode = BLOCKS;
-    case BLOCKS:
-      if ((r = inflate_blocks(z->state->sub.blocks, z, r)) != Z_STREAM_END)
-        return r;
-      inflate_blocks_free(z->state->sub.blocks, z, &c, &r);
-      if (z->state->nowrap)
-      {
-        if (r != -1)
-          z->msg = "inflate bug--took one too many bytes";
-        z->state->mode = r == -1 ? DONE : ERROR;
-        break;
-      }
-      z->state->sub.check.was = c;
-      if (r != -1)
-      {
-        z->state->sub.check.need = (uLong)r << 24;
-        z->state->mode = CHECK3;
-        r = Z_OK;
-        break;
-      }
-      r = Z_OK;
-      z->state->mode = CHECK4;
-    case CHECK4:
-      if (z->avail_in == 0) return r;  r = Z_OK;
-      z->state->sub.check.need = (uLong)NEXTBYTE << 24;
-      z->state->mode = CHECK3;
-    case CHECK3:
-      if (z->avail_in == 0) return r;  r = Z_OK;
-      z->state->sub.check.need += (uLong)NEXTBYTE << 16;
-      z->state->mode = CHECK2;
-    case CHECK2:
-      if (z->avail_in == 0) return r;  r = Z_OK;
-      z->state->sub.check.need += (uLong)NEXTBYTE << 8;
-      z->state->mode = CHECK1;
-    case CHECK1:
-      if (z->avail_in == 0) return r;  r = Z_OK;
-      z->state->sub.check.need += (uLong)NEXTBYTE;
-      if (z->state->sub.check.was != z->state->sub.check.need)
-      {
-        z->state->mode = ERROR;
-        z->msg = "incorrect data check";
-        return Z_DATA_ERROR;
-      }
-      z->state->mode = DONE;
-    case DONE:
-      return Z_STREAM_END;
-    case ERROR:
-      return Z_DATA_ERROR;
-    default:
-      return Z_STREAM_ERROR;
-  }
-}
-
-
-int inflateEnd(z)
-z_stream *z;
-{
-  uLong c;
-  int e;
-
-  if (z == Z_NULL || z->state == Z_NULL || z->zfree == Z_NULL)
-    return Z_STREAM_ERROR;
-  if (z->state->mode == BLOCKS)
-    inflate_blocks_free(z->state->sub.blocks, z, &c, &e);
-  ZFREE(z, z->state);
-  z->state = Z_NULL;
-  return Z_OK;
-}
-
-
-/* inflateSync not implemented yet--this just consumes input */
-int inflateSync(z)
-z_stream *z;
-{
-  if (z == Z_NULL) return Z_STREAM_ERROR;
-  if (z->avail_in == 0) return Z_BUF_ERROR;
-  do {
-    z->total_in++;
-  } while (--z->avail_in);
-  return Z_DATA_ERROR;
-}
-
-
-/* inflateReset not fully implemented yet--this frees and reallocates */
-int inflateReset(z)
-z_stream *z;
-{
-  int r;
-
-  if ((r = inflateEnd(z)) != Z_OK)
-    return r;
-  return inflateInit(z);
-}
diff --git a/inflate.c b/inflate.c
index 38d70cc..b76e246 100644
--- a/inflate.c
+++ b/inflate.c
@@ -22,7 +22,7 @@ struct internal_state {
       CHECK2,   /* two check bytes to go */
       CHECK1,   /* one check byte to go */
       DONE,     /* finished check, done */
-      ERROR}    /* got an error--stay here */
+      INF_ERROR}/* got an error--stay here */
     mode;               /* current inflate mode */
 
   /* mode dependent information */
@@ -92,7 +92,7 @@ int inflate(z, f)
 z_stream *z;
 int f;
 {
-  int r;
+  int r = f; /* to avoid warning about unused f */
   uInt b;
   uLong c;
 
@@ -105,13 +105,13 @@ int f;
       if (z->avail_in == 0) return r;  r = Z_OK;
       if (((z->state->sub.method = NEXTBYTE) & 0xf != DEFLATED))
       {
-        z->state->mode = ERROR;
+        z->state->mode = INF_ERROR;
         z->msg = "unknown compression method";
         return Z_DATA_ERROR;
       }
       if ((z->state->sub.method >> 4) + 8 > z->state->wbits)
       {
-        z->state->mode = ERROR;
+        z->state->mode = INF_ERROR;
         z->msg = "invalid window size";
         return Z_DATA_ERROR;
       }
@@ -120,13 +120,13 @@ int f;
       if (z->avail_in == 0) return r;  r = Z_OK;
       if ((b = NEXTBYTE) & 0x20)
       {
-        z->state->mode = ERROR;
+        z->state->mode = INF_ERROR;
         z->msg = "invalid reserved bit";
         return Z_DATA_ERROR;
       }
       if (((z->state->sub.method << 8) + b) % 31)
       {
-        z->state->mode = ERROR;
+        z->state->mode = INF_ERROR;
         z->msg = "incorrect header check";
         return Z_DATA_ERROR;
       }
@@ -140,23 +140,13 @@ int f;
     case BLOCKS:
       if ((r = inflate_blocks(z->state->sub.blocks, z, r)) != Z_STREAM_END)
         return r;
-      inflate_blocks_free(z->state->sub.blocks, z, &c, &r);
+      inflate_blocks_free(z->state->sub.blocks, z, &c);
       if (z->state->nowrap)
       {
-        if (r != -1)
-          z->msg = "inflate bug--took one too many bytes";
-        z->state->mode = r == -1 ? DONE : ERROR;
+      z->state->mode = DONE;
         break;
       }
       z->state->sub.check.was = c;
-      if (r != -1)
-      {
-        z->state->sub.check.need = (uLong)r << 24;
-        z->state->mode = CHECK3;
-        r = Z_OK;
-        break;
-      }
-      r = Z_OK;
       z->state->mode = CHECK4;
     case CHECK4:
       if (z->avail_in == 0) return r;  r = Z_OK;
@@ -175,14 +165,14 @@ int f;
       z->state->sub.check.need += (uLong)NEXTBYTE;
       if (z->state->sub.check.was != z->state->sub.check.need)
       {
-        z->state->mode = ERROR;
+        z->state->mode = INF_ERROR;
         z->msg = "incorrect data check";
         return Z_DATA_ERROR;
       }
       z->state->mode = DONE;
     case DONE:
       return Z_STREAM_END;
-    case ERROR:
+    case INF_ERROR:
       return Z_DATA_ERROR;
     default:
       return Z_STREAM_ERROR;
@@ -194,12 +184,11 @@ int inflateEnd(z)
 z_stream *z;
 {
   uLong c;
-  int e;
 
   if (z == Z_NULL || z->state == Z_NULL || z->zfree == Z_NULL)
     return Z_STREAM_ERROR;
   if (z->state->mode == BLOCKS)
-    inflate_blocks_free(z->state->sub.blocks, z, &c, &e);
+    inflate_blocks_free(z->state->sub.blocks, z, &c);
   ZFREE(z, z->state);
   z->state = Z_NULL;
   return Z_OK;
diff --git a/inftest.c b/inftest.c
index 7dc2907..d711bfa 100644
--- a/inftest.c
+++ b/inftest.c
@@ -2,6 +2,8 @@
 #include <stdlib.h>
 #include "zutil.h"
 
+void main __P((void));
+
 /* This test is in honor of Ed Hamrick who suggested that the interface
    to inflate be a byte at a time--this implements that, and is, of course,
    monumentally slow.  It has the virtue though of stressing the push-pull
@@ -61,7 +63,7 @@ void main()
       break;
   }
   inflateEnd(&z);
-  fprintf(stderr, "%d bytes in, %d bytes out\n", z.total_in, z.total_out);
+  fprintf(stderr, "%ld bytes in, %ld bytes out\n", z.total_in, z.total_out);
   if (z.msg != NULL)
     fprintf(stderr, "msg is <%s>\n", z.msg);
 }
diff --git a/inftrees.c b/inftrees.c
index 54c7c8e..ab0ed2c 100644
--- a/inftrees.c
+++ b/inftrees.c
@@ -383,6 +383,7 @@ 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);
 }
@@ -393,6 +394,7 @@ voidp q;
 voidp p;
 {
   Assert(0, "inflate_trees ffree called!");
+  if (q) q = p; /* to make some compilers happy */
 }
 
 
diff --git a/infutil.c b/infutil.c
index 1adadbf..3f687e6 100644
--- a/infutil.c
+++ b/infutil.c
@@ -31,7 +31,7 @@ int r;
   q = s->read;
 
   /* compute number of bytes to copy as far as end of window */
-  n = (q <= s->write ? s->write : s->end) - q;
+  n = (uInt)((q <= s->write ? s->write : s->end) - q);
   if (n > z->avail_out) n = z->avail_out;
   if (n && r == Z_BUF_ERROR) r = Z_OK;
 
@@ -55,7 +55,7 @@ int r;
       s->write = s->window;
 
     /* compute bytes to copy */
-    n = s->write - q;
+    n = (uInt)(s->write - q);
     if (n > z->avail_out) n = z->avail_out;
     if (n && r == Z_BUF_ERROR) r = Z_OK;
 
diff --git a/infutil.h b/infutil.h
index 30b230d..2aabf3c 100644
--- a/infutil.h
+++ b/infutil.h
@@ -22,7 +22,7 @@ struct inflate_blocks_state {
       CODES,    /* processing fixed or dynamic block */
       DRY,      /* output remaining window bytes */
       DONE,     /* finished last block, done */
-      ERROR}    /* got a data error--stuck here */
+      INF_ERROR}/* got a data error--stuck here */
     mode;               /* current inflate_block mode */
 
   /* mode dependent information */
@@ -63,7 +63,13 @@ struct inflate_blocks_state {
 #define LOADIN {p=z->next_in;n=z->avail_in;b=s->bitb;k=s->bitk;}
 #define NEEDBYTE {if(n)r=Z_OK;else LEAVE}
 #define NEXTBYTE (n--,*p++)
-#define NEEDBITS(j) {while(k<(j)){NEEDBYTE;b|=((uLong)NEXTBYTE)<<k;k+=8;}}
+#ifdef __TURBOC__ /* bug in TurboC compiler, bad code for b << 0 */
+#  define NEEDBITS(j) {\
+  while(k<(j)){NEEDBYTE;b=k?b|(((uLong)NEXTBYTE)<<k):NEXTBYTE;k+=8;}\
+}
+#else
+#  define NEEDBITS(j) {while(k<(j)){NEEDBYTE;b|=((uLong)NEXTBYTE)<<k;k+=8;}}
+#endif
 #define DUMPBITS(j) {b>>=(j);k-=(j);}
 /*   output bytes */
 #define WAVAIL (q<s->read?s->read-q-1:s->end-q)
diff --git a/minigzip.c b/minigzip.c
index 4936d64..d3d2fe9 100644
--- a/minigzip.c
+++ b/minigzip.c
@@ -13,15 +13,21 @@
  * or in pipe mode.
  */
 
-/* $Id: minigzip.c,v 1.2 1995/04/14 20:03:12 jloup Exp $ */
+/* $Id: minigzip.c,v 1.3 1995/04/29 14:27:21 jloup Exp $ */
 
 #include <stdio.h>
 #include "zlib.h"
 
-extern void exit __P((int));
+extern void exit  __P((int));
+extern int unlink __P((const char *));
+
+#ifdef STDC
+#  include <string.h>
+#endif
 
 #ifdef MSDOS
-#  include <fcntl.h> /* ??? find where setmode declared */
+#  include <fcntl.h>
+#  include <io.h>
 #  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
 #else
 #  define SET_BINARY_MODE(file)
@@ -38,6 +44,13 @@ extern void exit __P((int));
 
 char *prog;
 
+void error           __P((char *msg));
+void gz_compress     __P((FILE   *in, gzFile out));
+void gz_uncompress   __P((gzFile in, FILE   *out));
+void file_compress   __P((char  *file));
+void file_uncompress __P((char  *file));
+void main            __P((int argc, char *argv[]));
+
 /* ===========================================================================
  * Display error message and exit
  */
diff --git a/trees.c b/trees.c
index 62411a7..9234add 100644
--- a/trees.c
+++ b/trees.c
@@ -29,7 +29,7 @@
  *          Addison-Wesley, 1983. ISBN 0-201-06672-6.
  */
 
-/* $Id: trees.c,v 1.2 1995/04/10 16:21:44 jloup Exp $ */
+/* $Id: trees.c,v 1.3 1995/04/29 13:49:46 jloup Exp $ */
 
 #include "deflate.h"
 
@@ -944,7 +944,7 @@ local void set_data_type(s)
     while (n < 7)        bin_freq += s->dyn_ltree[n++].Freq;
     while (n < 128)    ascii_freq += s->dyn_ltree[n++].Freq;
     while (n < LITERALS) bin_freq += s->dyn_ltree[n++].Freq;
-    s->data_type = bin_freq > (ascii_freq >> 2) ? BINARY : ASCII;
+    s->data_type = (Byte)(bin_freq > (ascii_freq >> 2) ? BINARY : ASCII);
 }
 
 /* ===========================================================================
diff --git a/zconf.h b/zconf.h
index f08793b..bcd8510 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 1.8 1995/04/14 20:59:22 jloup Exp $ */
+/* $Id: zconf.h,v 1.9 1995/04/29 12:02:14 jloup Exp $ */
 
 #ifndef _ZCONF_H
 #define _ZCONF_H
@@ -28,6 +28,9 @@
 #if defined(MSDOS) && !defined(__32BIT__)
 #  define MAXSEG_64K
 #endif
+#if !defined(STDC) && (defined(MSDOS) || defined(__STDC__))
+#  define STDC
+#endif
 
 #ifdef MAXSEG_64K
 #  define MAX_MEM_LEVEL 8
@@ -38,7 +41,7 @@
                         /* Type declarations */
 
 #ifndef __P /* function prototypes */
-#  if defined(__STDC__) || defined(MSDOS)
+#  ifdef STDC
 #    define __P(args)  args
 #  else
 #    define __P(args)  ()
@@ -55,7 +58,7 @@
   typedef unsigned long  uLong; /* 32 bits or more */
 #endif
 #ifndef voidp
-#  if defined(__STDC__) || defined(MSDOS)
+#  ifdef STDC
      typedef void *voidp;
 #  else
      typedef Byte *voidp;
diff --git a/zlib.h b/zlib.h
index 6983fb7..f72fff8 100644
--- a/zlib.h
+++ b/zlib.h
@@ -1,5 +1,5 @@
 /* zlib.h -- interface of the 'zlib' general purpose compression library
-  version 0.79  April 28th, 1995.
+  version 0.8 April 29th, 1995.
 
   Copyright (C) 1995 Jean-loup Gailly and Mark Adler
 
@@ -28,7 +28,7 @@
 
 #include "zconf.h"
 
-#define ZLIB_VERSION "0.79"
+#define ZLIB_VERSION "0.8"
 
 /* 
      The 'zlib' compression library provides in-memory compression and
@@ -191,25 +191,30 @@ extern int deflate __P((z_stream *strm, int flush));
   so should be used only when necessary.  Using Z_FULL_FLUSH too often can
   seriously degrade the compression.
 
-    If the parameter flush is set to Z_FINISH, all pending input is
-  processed and all pending output is flushed. The next operation on this
-  stream must be another call of deflate with Z_FINISH but no more input data
-  (unchanged avail_in) if this call returned with avail_out equal to zero,
-  or a call of deflateEnd to deallocate the compression state. Z_FINISH can
-  be used immediately after deflateInit if all the compression is to be
-  done in a single step. In this case, avail_out must be at least 0.1%
-  larger than avail_in plus 12 bytes.
+    If the parameter flush is set to Z_FINISH, all pending input is processed,
+  all pending output is flushed and deflate returns with Z_STREAM_END if there
+  was enough output space; if deflate returns with Z_OK, this function must be
+  called again with Z_FINISH and more output space (updated avail_out) but no
+  more input data, until it returns with Z_STREAM_END or an error. After
+  deflate has returned Z_STREAM_END, the only possible operations on the
+  stream are deflateReset or deflateEnd.
+  
+    Z_FINISH can be used immediately after deflateInit if all the compression
+  is to be done in a single step. In this case, avail_out must be at least
+  0.1% larger than avail_in plus 12 bytes.  If deflate does not return
+  Z_STREAM_END, then it must be called again as described above.
 
     deflate() may update data_type if it can make a good guess about
   the input data type (Z_ASCII or Z_BINARY). In doubt, the data is considered
   binary. This field is only for information purposes and does not affect
   the compression algorithm in any manner.
 
-    deflate() returns Z_OK if some progress has been made (more input processed
-  or more output produced), Z_STREAM_ERROR if the stream state was
-  inconsistent (for example if next_in or next_out was NULL), Z_BUF_ERROR if
-  no progress is possible or if there was not enough room in the output buffer
-  when Z_FINISH is used. ??? to be changed (use Z_STEAM_END) */
+    deflate() returns Z_OK if some progress has been made (more input
+  processed or more output produced), Z_STREAM_END if all input has been
+  consumed and all output has been produced (only when flush is set to
+  Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example
+  if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible.
+*/
 
 
 extern int deflateEnd __P((z_stream *strm));
@@ -534,7 +539,8 @@ extern int    gzflush __P((gzFile file, int flush));
 /*
      Flushes all pending output into the compressed file. The parameter
    flush is as in the deflate() function. The return value is the zlib
-   error number (see function gzerror below).
+   error number (see function gzerror below). gzflush returns Z_OK if
+   the flush parameter is Z_FINISH and all output could be flushed.
      gzflush should be called only when strictly necessary because it can
    degrade compression.
 */
diff --git a/zutil.c b/zutil.c
index 9fd4ecc..4ceb89f 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 1.5 1995/04/14 21:30:23 jloup Exp $ */
+/* $Id: zutil.c,v 1.6 1995/04/29 14:54:02 jloup Exp $ */
 
 #include <stdio.h>
 
@@ -55,7 +55,7 @@ void zmemzero(dest, len)
 }
 #endif
 
-#if defined(MSDOS) && !defined(USE_CALLOC)
+#if defined(MSDOS) && !defined(__SMALL__) && !defined(M_I86SM)
 #  ifdef __TURBOC__
 
 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
@@ -84,7 +84,7 @@ local ptr_table table[MAX_PTR];
 
 voidp zcalloc (voidp opaque, unsigned items, unsigned size)
 {
-    voidp buf;
+    voidp buf = opaque; /* just to make some compilers happy */
     ulg bsize = (ulg)items*size;
 
     if (bsize < 65536L) {
@@ -121,6 +121,7 @@ void  zcfree (voidp opaque, voidp ptr)
         next_ptr--;
         return;
     }
+    ptr = opaque; /* just to make some compilers happy */
     z_error("zcfree: ptr not found");
 }
 
@@ -133,11 +134,13 @@ void  zcfree (voidp opaque, voidp ptr)
 
 voidp zcalloc (voidp opaque, unsigned items, unsigned size)
 {
+    if (opaque) opaque = 0; /* to make compiler happy */
     return _halloc((long)items, size);
 }
 
 void  zcfree (voidp opaque, voidp ptr)
 {
+    if (opaque) opaque = 0; /* to make compiler happy */
     _hfree(ptr);
 }
 
diff --git a/zutil.h b/zutil.h
index 20b20f5..88f5961 100644
--- a/zutil.h
+++ b/zutil.h
@@ -8,7 +8,7 @@
    subject to change. Applications should only use zlib.h.
  */
 
-/* $Id: zutil.h,v 1.5 1995/04/14 21:22:38 jloup Exp $ */
+/* $Id: zutil.h,v 1.6 1995/04/29 15:52:16 jloup Exp $ */
 
 #ifndef _Z_UTIL_H
 #define _Z_UTIL_H
@@ -20,9 +20,8 @@
 #else
     extern int errno;
 #endif
-#ifdef __STDC__
+#ifdef STDC
 #  include <string.h>
-#  include <memory.h>
 #endif
 
 #ifndef local
@@ -66,7 +65,6 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #  define OS_CODE  0x00
 #  ifdef __TURBOC__
 #    include <alloc.h>
-#    define exit(n) _exit(n)
 #  else /* MSC */
 #    include <malloc.h>
 #  endif
@@ -125,7 +123,7 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #  define zstrerror(errnum) ""
 #endif
 
-#if defined(__STDC__) && !defined(HAVE_MEMCPY)
+#if defined(STDC) && !defined(HAVE_MEMCPY)
 #  define HAVE_MEMCPY
 #endif
 #ifdef HAVE_MEMCPY