23 files changed, 559 insertions, 140 deletions

diff --git a/ChangeLog b/ChangeLog
index 40fc89f..c0536d2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
                 ChangeLog file for zlib
 
+Changes in 0.79 (28 April 95)
+- add fast inflate (inffast.c)
+- In gzio destroy(), don't reference a freed structure
+- avoid many warnings for MSDOS
+
 Changes in 0.71 (14 April 95)
 - Fixed more MSDOS compilation problems :( There is still a bug with
   TurboC large model.
diff --git a/Makefile b/Makefile
index 478920a..facba8a 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ LDFLAGS=-L. -lgz
 RANLIB=ranlib
 
 OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
-       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o
+       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o
 
 TEST_OBJS = example.o minigzip.o inftest.o
 
@@ -48,7 +48,8 @@ deflate.o: deflate.h zutil.h zlib.h zconf.h
 example.o: zlib.h zconf.h
 gzio.o: zutil.h zlib.h zconf.h
 infblock.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
-infcodes.o: zutil.h zlib.h zconf.h inftrees.h infutil.h infcodes.h
+infcodes.o: zutil.h zlib.h zconf.h inftrees.h infutil.h infcodes.h inffast.h
+inffast.o: zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
 inflate.o: zutil.h zlib.h zconf.h infblock.h
 inftest.o: zutil.h zlib.h zconf.h
 inftrees.o: zutil.h zlib.h zconf.h inftrees.h
diff --git a/README b/README
index 5c42402..5705062 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-zlib 0.71 is a beta version of a general purpose compression library.
+zlib 0.79 is a beta version of a general purpose compression library.
 
 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
@@ -9,16 +9,10 @@ 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 0.71 are documented in the file ChangeLog.
-The main changes since 0.5 are:
-- added full inflate support
-- added minigzip.c
-- added gzdopen to reopen a file descriptor as gzFile
-- added transparent reading of non-gziped files in gzread.
-- fix some MSDOS problems. example and minigzip now work on MSDOS.
-- Simplified the crc32() interface. The pre- and post-conditioning
-  (one's complement) is now done inside crc32(). WARNING: this is
-  incompatible with previous versions; see zlib.h for the new usage.
+The changes made in version 0.79 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
diff --git a/deflate.c b/deflate.c
index 2409f07..7d44627 100644
--- a/deflate.c
+++ b/deflate.c
@@ -47,7 +47,7 @@
  *
  */
 
-/* $Id: deflate.c,v 1.3 1995/04/10 16:03:45 jloup Exp $ */
+/* $Id: deflate.c,v 1.4 1995/04/14 19:49:46 jloup Exp $ */
 
 #include "deflate.h"
 
@@ -195,9 +195,11 @@ int deflateInit2 (strm, level, method, windowBits, memLevel, strategy)
     s->noheader = noheader;
     s->w_bits = windowBits;
     s->w_size = 1 << s->w_bits;
+    s->w_mask = s->w_size - 1;
 
     s->hash_bits = memLevel + 7;
     s->hash_size = 1 << s->hash_bits;
+    s->hash_mask = s->hash_size - 1;
     s->hash_shift =  ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH);
 
     s->window = (Byte*) ZALLOC(strm, s->w_size, 2*sizeof(Byte));
diff --git a/example.c b/example.c
index ea1a9eb..86541a7 100644
--- a/example.c
+++ b/example.c
@@ -3,7 +3,7 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: example.c,v 1.4 1995/04/14 13:32:49 jloup Exp $ */
+/* $Id: example.c,v 1.5 1995/04/14 20:35:56 jloup Exp $ */
 
 #include <stdio.h>
 #include "zlib.h"
@@ -60,7 +60,7 @@ void test_gzio(out, in)
     char *in;  /* input file */
 {
     local Byte uncompr[BUFLEN];
-    uLong uncomprLen = sizeof(uncompr);
+    int uncomprLen = sizeof(uncompr);
     int err;
     int len = strlen(hello)+1;
     gzFile file;
@@ -114,7 +114,7 @@ uLong test_deflate(compr)
     c_stream.next_in  = (Byte*)hello;
     c_stream.next_out = compr;
 
-    while (c_stream.total_in != len) {
+    while (c_stream.total_in != (uLong)len) {
         c_stream.avail_in = c_stream.avail_out = 1; /* force small buffers */
         err = deflate(&c_stream, Z_NO_FLUSH);
         CHECK_ERR(err, "deflate");
diff --git a/gzio.c b/gzio.c
index b488e96..365b6f5 100644
--- a/gzio.c
+++ b/gzio.c
@@ -71,8 +71,9 @@ local int destroy (s)
     if (s->file != NULL && fclose(s->file)) {
         err = Z_ERRNO;
     }
+    if (s->z_err < 0) err = s->z_err;
     zcfree((voidp)0, s);
-    return s->z_err < 0 ? s->z_err : err;
+    return err;
 }
 
 /* ===========================================================================
@@ -235,9 +236,10 @@ int gzread (file, buf, len)
 
     if (s->transparent) {
         unsigned n = 0;
+        Byte *b = (Byte*)buf;
         /* Copy the first two (non-magic) bytes if not done already */
         while (s->stream.avail_in > 0 && len > 0) {
-            *((Byte*)buf)++ = *s->stream.next_in++;
+            *b++ = *s->stream.next_in++;
             s->stream.avail_in--;
             len--; n++;
         }
@@ -364,7 +366,7 @@ local void putLong (file, x)
 {
     int n;
     for (n = 0; n < 4; n++) {
-        fputc(x & 0xff, file);
+        fputc((int)(x & 0xff), file);
         x >>= 8;
     }
 }
diff --git a/infblock.c b/infblock.c
index 3a58280..4d8bd48 100644
--- a/infblock.c
+++ b/infblock.c
@@ -60,16 +60,17 @@ local uInt border[] = {	/* Order of the bit length code lengths */
       the two sets of lengths.
  */
 
-struct inflate_blocks_state *inflate_blocks_new(z,wsize)
+struct inflate_blocks_state *inflate_blocks_new(z, c, w)
 z_stream *z;
-uInt wsize;
+check_func c;
+uInt w;
 {
   struct inflate_blocks_state *s;
 
   if ((s = (struct inflate_blocks_state *)ZALLOC
        (z,1,sizeof(struct inflate_blocks_state))) == Z_NULL)
     return s;
-  if ((s->window = (Byte *)ZALLOC(z,1,wsize)) == Z_NULL)
+  if ((s->window = (Byte *)ZALLOC(z, 1, w)) == Z_NULL)
   {
     ZFREE(z, s);
     return Z_NULL;
@@ -77,8 +78,10 @@ uInt wsize;
   s->mode = TYPE;
   s->bitk = 0;
   s->read = s->write = s->window;
-  s->end = s->window + wsize;
-  s->check = 1;
+  s->end = s->window + w;
+  s->checkfn = c;
+  if (s->checkfn != Z_NULL)
+    s->check = (*s->checkfn)(0L, Z_NULL, 0);
   return s;
 }
 
@@ -312,8 +315,9 @@ z_stream *z;
 uLong *c;
 int *e;
 {
-  *e = s->bitk > 7 ? (s->bitb >> (s->bitk & 7)) & 0xff : -1;
-  *c = s->check;
+  *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)
     ZFREE(z, s->sub.trees.blens);
   if (s->mode == CODES)
diff --git a/infblock.h b/infblock.h
index f70c471..a21d730 100644
--- a/infblock.h
+++ b/infblock.h
@@ -12,6 +12,7 @@ struct inflate_blocks_state;
 
 extern struct inflate_blocks_state * inflate_blocks_new __P((
     z_stream *,
+    check_func checkfn,               /* check function */
     uInt));                     /* window size */
 
 extern int inflate_blocks __P((
diff --git a/infcodes.c b/infcodes.c
index ffae26d..489f9d6 100644
--- a/infcodes.c
+++ b/infcodes.c
@@ -6,6 +6,7 @@
 #include "zutil.h"
 #include "inftrees.h"
 #include "infutil.h"
+#include "inffast.h"
 #include "infcodes.h"
 
 /* simplify the use of the inflate_huft type with some defines */
@@ -98,7 +99,19 @@ int r;
   while (1) switch (c->mode)
   {             /* waiting for "i:"=input, "o:"=output, "x:"=nothing */
     case START:         /* x: set up for LEN */
-      /* %%% check for avail in and out to do fast loop %%% */
+#ifndef SLOW
+      if (m >= 258 && n >= 10)
+      {
+        UPDATE
+        r = inflate_fast(c->lbits, c->dbits, c->ltree, c->dtree, s, z);
+        LOAD
+        if (r != Z_OK)
+        {
+          c->mode = r == Z_STREAM_END ? WASH : BAD;
+          break;
+        }
+      }
+#endif /* !SLOW */
       c->sub.code.need = c->lbits;
       c->sub.code.tree = c->ltree;
       c->mode = LEN;
@@ -112,14 +125,14 @@ int r;
         if (e == -128)          /* invalid code */
         {
           c->mode = BAD;
-          z->msg = "invalid huffman code";
+          z->msg = "invalid literal/length code";
           r = Z_DATA_ERROR;
           LEAVE
         }
         e = -e;
         if (e & 64)             /* end of block */
         {
-          c->mode = END;
+          c->mode = WASH;
           break;
         }
         c->sub.code.need = e;
@@ -153,7 +166,7 @@ int r;
         if (e == -128)
         {
           c->mode = BAD;
-          z->msg = "invalid huffman code";
+          z->msg = "invalid distance code";
           r = Z_DATA_ERROR;
           LEAVE
         }
@@ -171,7 +184,7 @@ int r;
       DUMPBITS(j)
       c->mode = COPY;
     case COPY:          /* o: copying bytes in window, waiting for space */
-      f = q - s->window < c->sub.copy.dist ?
+      f = (uInt)(q - s->window) < c->sub.copy.dist ?
           s->end - (c->sub.copy.dist - (q - s->window)) :
           q - c->sub.copy.dist;
       while (c->len)
diff --git a/inffast.c b/inffast.c
new file mode 100644
index 0000000..8c3e4ce
--- /dev/null
+++ b/inffast.c
@@ -0,0 +1,148 @@
+/* inffast.c -- process literals and length/distance pairs fast
+ * Copyright (C) 1995 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h 
+ */
+
+#include "zutil.h"
+#include "inftrees.h"
+#include "infutil.h"
+#include "inffast.h"
+
+/* simplify the use of the inflate_huft type with some defines */
+#define base more.Base
+#define next more.Next
+#define exop word.what.Exop
+#define bits word.what.Bits
+
+/* macros for bit input with no checking and for returning unused bytes */
+#ifdef DEBUG
+#  undef NEXTBYTE
+#  define NEXTBYTE (n--?0:fprintf(stderr,"inffast underrun\n"),*p++)
+#endif
+#define GRABBITS(j) {while(k<(j)){b|=((uLong)NEXTBYTE)<<k;k+=8;}}
+#define UNGRAB {n+=(c=k>>3);p-=c;k&=7;}
+
+/* Called with number of bytes left to write in window at least 258
+   (the maximum string length) and number of input bytes available
+   at least ten.  The ten bytes are six bytes for the longest length/
+   distance pair plus four bytes for overloading the bit buffer. */
+
+int inflate_fast(bl, bd, tl, td, s, z)
+uInt bl, bd;
+inflate_huft *tl, *td;
+struct inflate_blocks_state *s;
+z_stream *z;
+{
+  inflate_huft *t;      /* temporary pointer */
+  int e;                /* extra bits or operation */
+  uLong b;              /* bit buffer */
+  uInt k;               /* bits in bit buffer */
+  Byte *p;              /* input data pointer */
+  uInt n;               /* bytes available there */
+  Byte *q;              /* output window write pointer */
+  uInt m;               /* bytes to end of window or read pointer */
+  uInt ml;              /* mask for literal/length tree */
+  uInt md;              /* mask for distance tree */
+  uInt c;               /* bytes to copy */
+  uInt d;               /* distance back to copy from */
+  Byte *r;              /* copy source pointer */
+
+  /* load input, output, bit values */
+  LOAD
+
+  /* initialize masks in registers */
+  ml = inflate_mask[bl];
+  md = inflate_mask[bd];
+
+  /* do until not enough input or output space for fast loop */
+  do {                          /* assume called with m >= 258 && n >= 10 */
+    /* get literal/length code */
+    GRABBITS(20)                /* max bits for literal/length code */
+    if ((e = (t = tl + ((uInt)b & ml))->exop) < 0)
+      do {
+        if (e == -128)
+        {
+          z->msg = "invalid literal/length code";
+          UNGRAB
+          UPDATE
+          return Z_DATA_ERROR;
+        }
+        DUMPBITS(t->bits)
+        e = -e;
+        if (e & 64)             /* end of block */
+        {
+          UNGRAB
+          UPDATE
+          return Z_STREAM_END;
+        }
+      } while ((e = (t = t->next + ((uInt)b & inflate_mask[e]))->exop) < 0);
+    DUMPBITS(t->bits)
+
+    /* process literal or length (end of block already trapped) */
+    if (e & 16)                 /* then it's a literal */
+    {
+      *q++ = (Byte)t->base;
+      m--;
+    }
+    else                        /* it's a length */
+    {
+      /* get length of block to copy (already have extra bits) */
+      c = t->base + ((uInt)b & inflate_mask[e]);
+      DUMPBITS(e);
+
+      /* decode distance base of block to copy */
+      GRABBITS(15);             /* max bits for distance code */
+      if ((e = (t = td + ((uInt)b & md))->exop) < 0)
+        do {
+          if (e == -128)
+          {
+            z->msg = "invalid distance code";
+            UNGRAB
+            UPDATE
+            return Z_DATA_ERROR;
+          }
+          DUMPBITS(t->bits)
+          e = -e;
+        } while ((e = (t = t->next + ((uInt)b & inflate_mask[e]))->exop) < 0);
+      DUMPBITS(t->bits)
+
+      /* get extra bits to add to distance base */
+      GRABBITS(e)           /* get extra bits (up to 13) */
+      d = t->base + ((uInt)b & inflate_mask[e]);
+      DUMPBITS(e)
+
+      /* do the copy */
+      m -= c;
+      if (q - s->window >= d)           /* if offset before destination, */
+      {                                 /*  just copy */
+        r = q - d;
+        *q++ = *r++;  c--;              /* minimum count is three, */
+        *q++ = *r++;  c--;              /*  so unroll loop a little */
+        do {
+          *q++ = *r++;
+        } while (--c);
+      }
+      else                              /* else offset after destination */
+      {
+        e = d - (q - s->window);        /* bytes from offset to end */
+        r = s->end - e;                 /* pointer to offset */
+        if (c > e)                      /* if source crosses, */
+        {
+          c -= e;                       /* copy to end of window */
+          do {
+            *q++ = *r++;
+          } while (--e);
+          r = s->window;                /* copy rest from start of window */
+        }
+        do {                            /* copy all or what's left */
+          *q++ = *r++;
+        } while (--c);
+      }
+    }
+  } while (m >= 258 && n >= 10);
+
+  /* not enough input or output--restore pointers and return */
+  UNGRAB
+  UPDATE
+  return Z_OK;
+}
diff --git a/inffast.h b/inffast.h
new file mode 100644
index 0000000..2c05820
--- /dev/null
+++ b/inffast.h
@@ -0,0 +1,17 @@
+/* inffast.h -- header to use inffast.c
+ * Copyright (C) 1995 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h 
+ */
+
+/* WARNING: this file should *not* be used by applications. It is
+   part of the implementation of the compression library and is
+   subject to change. Applications should only use zlib.h.
+ */
+
+extern int inflate_fast __P((
+    uInt,
+    uInt,
+    inflate_huft *,
+    inflate_huft *,
+    struct inflate_blocks_state *,
+    z_stream *));
diff --git a/inflate-0.72.c b/inflate-0.72.c
new file mode 100644
index 0000000..56b0665
--- /dev/null
+++ b/inflate-0.72.c
@@ -0,0 +1,230 @@
+/* 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 478f46d..38d70cc 100644
--- a/inflate.c
+++ b/inflate.c
@@ -25,10 +25,6 @@ struct internal_state {
       ERROR}    /* got an error--stay here */
     mode;               /* current inflate mode */
 
-  int  no_header;
-  uInt w_size;  /* LZ77 window size (32K by default) */
-  uInt w_bits;  /* log2(w_size)  (8..16) */
-
   /* mode dependent information */
   union {
     uInt method;        /* if FLAGS, method byte */
@@ -39,19 +35,26 @@ struct internal_state {
       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 (strm)
-z_stream *strm;
+int inflateInit(z)
+z_stream *z;
 {
-    return inflateInit2(strm, WBITS);
+    return inflateInit2(z, WBITS);
 }
 
-int inflateInit2(z, windowBits)
+
+int inflateInit2(z, w)
 z_stream *z;
-int windowBits;
+int w;
 {
+  /* initialize state */
   if (z == Z_NULL)
     return Z_STREAM_ERROR;
   if (z->zalloc == Z_NULL) z->zalloc = zcalloc;
@@ -63,19 +66,22 @@ int windowBits;
     return Z_MEM_ERROR;
   z->state->mode = METHOD;
 
-  z->state->no_header = 0;
-  if (windowBits < 0) { /* undocumented feature: no zlib header */
-    windowBits = - windowBits;
-    z->state->no_header = 1;
-    z->state->sub.method = DEFLATED;
+  /* 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;
   }
-  if (windowBits < 8 || windowBits > 15) {
+
+  /* set window size */
+  if (w < 8 || w > 15)
+  {
     inflateEnd(z);
     return Z_STREAM_ERROR;
   }
-  z->state->w_bits = windowBits;
-  z->state->w_size = 1<<windowBits;
+  z->state->wbits = w;
   return Z_OK;
 }
 
@@ -103,7 +109,7 @@ int f;
         z->msg = "unknown compression method";
         return Z_DATA_ERROR;
       }
-      if ((z->state->sub.method >> 4) > z->state->w_bits)
+      if ((z->state->sub.method >> 4) + 8 > z->state->wbits)
       {
         z->state->mode = ERROR;
         z->msg = "invalid window size";
@@ -126,17 +132,21 @@ int f;
       }
       z->state->mode = START;
     case START:
-      if ((z->state->sub.blocks = inflate_blocks_new(z,z->state->w_size))
-          == Z_NULL)
+      if ((z->state->sub.blocks = inflate_blocks_new(z,
+         z->state->nowrap ? Z_NULL : adler32,
+         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->no_header) {
-        z->state->mode = DONE;
-        return Z_STREAM_END;
+      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)
diff --git a/inflate.h b/inflate.h
deleted file mode 100644
index 843224f..0000000
--- a/inflate.h
+++ /dev/null
@@ -1,22 +0,0 @@
-/* temporary kludge assuming single pass decompression */
-
-/* $Id: inflate.h,v 1.2 1995/04/11 14:47:32 jloup Exp $ */
-
-#include <stdio.h>
-
-#define NEXTBYTE \
-   (istrm->total_in++, istrm->avail_in-- == 0 ? \
-      (z_error("too small"), 0) : *istrm->next_in++)
-
-#define FLUSH(n) { \
-   if (istrm->avail_out < n) z_error("too big"); \
-   istrm->avail_out -= n; \
-   memcpy(istrm->next_out, slide, n); \
-   istrm->next_out += n; \
-   istrm->total_out += n; \
-}
-#define WSIZE istrm->state->w_size
-#define slide istrm->state->window
-#define memzero(a,s) memset((a),0,(s))
-#define inflate z_inflate
-#define qflag 1
diff --git a/inftrees.c b/inftrees.c
index 4b00e3c..54c7c8e 100644
--- a/inftrees.c
+++ b/inftrees.c
@@ -246,7 +246,7 @@ z_stream *zs;		/* for zalloc function */
         {
           x[h] = i;             /* save pattern for backing up */
           r.bits = (char)l;     /* bits to dump before this table */
-          r.exop = (char)(-j);  /* bits in this table */
+          r.exop = -(char)j;    /* bits in this table */
           r.next = q;           /* pointer to this table */
           j = i >> (w - l);     /* (get around Turbo C bug) */
           u[h-1][j] = r;        /* connect to last table */
diff --git a/infutil.c b/infutil.c
index 92d115f..1adadbf 100644
--- a/infutil.c
+++ b/infutil.c
@@ -40,7 +40,8 @@ int r;
   z->total_out += n;
 
   /* update check information */
-  s->check = adler32(s->check, q, n);
+  if (s->checkfn != Z_NULL)
+    s->check = (*s->checkfn)(s->check, q, n);
 
   /* copy as far as end of window */
   while (n--) *p++ = *q++;
@@ -48,8 +49,10 @@ int r;
   /* see if more to copy at beginning of window */
   if (q == s->end)
   {
-    /* wrap source pointer */
+    /* wrap pointers */
     q = s->window;
+    if (s->write == s->end)
+      s->write = s->window;
 
     /* compute bytes to copy */
     n = s->write - q;
@@ -61,7 +64,8 @@ int r;
     z->total_out += n;
 
     /* update check information */
-    s->check = adler32(s->check, q, n);
+    if (s->checkfn != Z_NULL)
+      s->check = (*s->checkfn)(s->check, q, n);
 
     /* copy */
     while (n--) *p++ = *q++;
diff --git a/infutil.h b/infutil.h
index af07372..30b230d 100644
--- a/infutil.h
+++ b/infutil.h
@@ -47,6 +47,7 @@ struct inflate_blocks_state {
   Byte *end;            /* one byte after sliding window */
   Byte *read;           /* window read pointer */
   Byte *write;          /* window write pointer */
+  check_func checkfn;   /* check function */
   uLong check;          /* check on output */
 
 };
diff --git a/minigzip.c b/minigzip.c
index 688b3a1..4936d64 100644
--- a/minigzip.c
+++ b/minigzip.c
@@ -13,13 +13,15 @@
  * or in pipe mode.
  */
 
-/* $Id: minigzip.c,v 1.1 1995/04/14 13:35:59 jloup Exp $ */
+/* $Id: minigzip.c,v 1.2 1995/04/14 20:03:12 jloup Exp $ */
 
 #include <stdio.h>
 #include "zlib.h"
 
+extern void exit __P((int));
+
 #ifdef MSDOS
-#  include <fcntl.h>
+#  include <fcntl.h> /* ??? find where setmode declared */
 #  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
 #else
 #  define SET_BINARY_MODE(file)
@@ -87,7 +89,7 @@ void gz_uncompress(in, out)
         if (len < 0) error (gzerror(in, &err));
         if (len == 0) break;
 
-        if (fwrite(buf, 1, len, out) != len) error("failed fwrite");
+        if (fwrite(buf, 1, len, out) != (uInt)len) error("failed fwrite");
     }
     if (fclose(out)) error("failed fclose");
 
diff --git a/trees.c b/trees.c
index 79cab9f..62411a7 100644
--- a/trees.c
+++ b/trees.c
@@ -1011,7 +1011,7 @@ local void bi_windup(s)
     if (s->bi_valid > 8) {
         put_short(s, s->bi_buf);
     } else if (s->bi_valid > 0) {
-        put_byte(s, s->bi_buf);
+        put_byte(s, (Byte)s->bi_buf);
     }
     s->bi_buf = 0;
     s->bi_valid = 0;
diff --git a/zconf.h b/zconf.h
index 29496d7..f08793b 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 1.7 1995/04/12 20:42:28 jloup Exp $ */
+/* $Id: zconf.h,v 1.8 1995/04/14 20:59:22 jloup Exp $ */
 
 #ifndef _ZCONF_H
 #define _ZCONF_H
diff --git a/zlib.h b/zlib.h
index d1f2ca9..6983fb7 100644
--- a/zlib.h
+++ b/zlib.h
@@ -1,5 +1,5 @@
 /* zlib.h -- interface of the 'zlib' general purpose compression library
-  version 0.7  April 14th, 1995.
+  version 0.79  April 28th, 1995.
 
   Copyright (C) 1995 Jean-loup Gailly and Mark Adler
 
@@ -28,7 +28,7 @@
 
 #include "zconf.h"
 
-#define ZLIB_VERSION "0.7"
+#define ZLIB_VERSION "0.79"
 
 /* 
      The 'zlib' compression library provides in-memory compression and
@@ -88,7 +88,7 @@ typedef struct z_stream_s {
 
    zalloc must return Z_NULL if there is not enough memory for the object.
    On 16-bit systems, the functions zalloc and zfree must be able to allocate
-   exactly 65536 bytes, but will not be require to allocate more than this
+   exactly 65536 bytes, but will not be required to allocate more than this
    if the symbol MAXSEG_64K is defined (see zconf.h).
 
    The fields total_in and total_out can be used for statistics or
@@ -152,10 +152,10 @@ extern int deflateInit __P((z_stream *strm, int level));
    to level 6).
 
      deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
-   enough memory, Z_STREAM_ERROR if the stream state was inconsistent (such
-   as zalloc being NULL). msg is set to null if there is no error message.
-   deflateInit does not perform any compression: this will be done by
-   deflate().  */
+   enough memory, Z_STREAM_ERROR if level is not a valid compression level.
+   msg is set to null if there is no error message.  deflateInit does not
+   perform any compression: this will be done by deflate().
+*/
 
 
 extern int deflate __P((z_stream *strm, int flush));
@@ -164,8 +164,8 @@ extern int deflate __P((z_stream *strm, int flush));
 
   - Compress more input starting at next_in and update next_in and avail_in
     accordingly. If not all input can be processed (because there is not
-    enough room in the output buffer), next_in is updated and processing
-    will resume at this point for the next call of deflate().
+    enough room in the output buffer), next_in and avail_in are updated and
+    processing will resume at this point for the next call of deflate().
 
   - Provide more output starting at next_out and update next_out and avail_out
     accordingly. This action is forced if the parameter flush is non zero.
@@ -175,20 +175,21 @@ extern int deflate __P((z_stream *strm, int flush));
 
   Before the call of deflate(), the application should ensure that at least
   one of the actions is possible, by providing more input and/or consuming
-  more output, and updating avail_in or avail_out accordingly.
-  The application can consume the compressed output when the output
-  buffer is full (avail_out == 0), or after each call of deflate().
+  more output, and updating avail_in or avail_out accordingly; avail_out
+  should never be zero before the call. The application can consume the
+  compressed output when it wants, for example when the output buffer is full
+  (avail_out == 0), or after each call of deflate().
 
     If the parameter flush is set to Z_PARTIAL_FLUSH, the current compression
-  block is byte aligned and flushed to the output buffer so that the
-  decompressor can get all input data available so far; if the compression
-  method is 8 (deflate without partial flush capability), the current block
-  is terminated. If flush is set to Z_FULL_FLUSH, the compression block is
-  terminated, a special marker is output and the compression dictionary is
-  discarded; this is useful to allow the decompressor to synchronize if one
-  compressed block has been damaged.
-    Flushing degrades compression and so should be used only when necessary.
-  Using Z_FULL_FLUSH too often can seriously degrade the compression.
+  block is terminated and flushed to the output buffer so that the
+  decompressor can get all input data available so far. For method 9, a future
+  variant on method 8, the current block will be flushed but not terminated.
+  If flush is set to Z_FULL_FLUSH, the compression block is terminated, a
+  special marker is output and the compression dictionary is discarded; this
+  is useful to allow the decompressor to synchronize if one compressed block
+  has been damaged (see inflateSync below).  Flushing degrades compression and
+  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
@@ -197,19 +198,18 @@ extern int deflate __P((z_stream *strm, int flush));
   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 8 bytes.
+  larger than avail_in plus 12 bytes.
 
-    deflate() may update strm->data_type if it can make a good guess about
+    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() return Z_OK if some progress has been made (more input processed
+    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.
-*/
+  when Z_FINISH is used. ??? to be changed (use Z_STEAM_END) */
 
 
 extern int deflateEnd __P((z_stream *strm));
@@ -232,8 +232,7 @@ extern int inflateInit __P((z_stream *strm));
    functions.
 
      inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
-   enough memory, Z_STREAM_ERROR if the stream state was inconsistent (such
-   as zalloc being NULL). msg is set to null if there is no error message.
+   enough memory.  msg is set to null if there is no error message.
    inflateInit does not perform any decompression: this will be done by
    inflate().
 */
@@ -255,8 +254,9 @@ extern int inflate __P((z_stream *strm, int flush));
   Before the call of inflate(), the application should ensure that at least
   one of the actions is possible, by providing more input and/or consuming
   more output, and updating the next_* and avail_* values accordingly.
-  The application can consume the uncompressed output when the output
-  buffer is full (avail_out == 0), or after each call of inflate().
+  The application can consume the uncompressed output when it wants, for
+  example when the output buffer is full (avail_out == 0), or after each
+  call of inflate().
 
     If the parameter flush is set to Z_PARTIAL_FLUSH, inflate flushes as much
   output as possible to the output buffer. The flushing behavior of inflate is
@@ -275,13 +275,13 @@ extern int inflate __P((z_stream *strm, int flush));
 
     inflate() returns Z_OK if some progress has been made (more input
   processed or more output produced), Z_STREAM_END if the end of the
-  compressed data has been reached, Z_DATA_ERROR if the input data was
-  corrupted, Z_STREAM_ERROR if the stream structure was inconsistent (for
-  example if next_in or next_out was NULL), Z_MEM_ERROR if there was not enough
-  memory, Z_BUF_ERROR if no progress is possible or if there was not enough
-  room in the output buffer when Z_FINISH is used. In the Z_DATA_ERROR case,
-  the application may then call inflateSync to look for a good compression
-  block.
+  compressed data has been reached and all uncompressed output has been
+  produced, Z_DATA_ERROR if the input data was corrupted, Z_STREAM_ERROR if
+  the stream structure was inconsistent (for example if next_in or next_out
+  was NULL), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR if no
+  progress is possible or if there was not enough room in the output buffer
+  when Z_FINISH is used. In the Z_DATA_ERROR case, the application may then
+  call inflateSync to look for a good compression block.
 */
 
 
@@ -318,9 +318,9 @@ extern int deflateInit2 __P((z_stream *strm,
 
      The windowBits parameter is the base two logarithm of the window size
    (the size of the history buffer).  It should be in the range 8..15 for this
-   version of the library (the value 16 will be allowed soon). Larger values
-   of this parameter result in better compression at the expense of memory
-   usage. The default value is 15 if deflateInit is used instead.
+   version of the library (the value 16 will be allowed for method 9). Larger
+   values of this parameter result in better compression at the expense of
+   memory usage. The default value is 15 if deflateInit is used instead.
 
     The memLevel parameter specifies how much memory should be allocated
    for the internal compression state. memLevel=1 uses minimum memory but
@@ -338,8 +338,8 @@ extern int deflateInit2 __P((z_stream *strm,
 
      If next_in is not null, the library will use this buffer to hold also
    some history information; the buffer must either hold the entire input
-   data, or have at least (1<<windowBits) bytes and be writable. If next_in is
-   null, the library will allocate its own history buffer (and leave next_in
+   data, or have at least 1<<(windowBits+1) bytes and be writable. If next_in
+   is null, the library will allocate its own history buffer (and leave next_in
    null). next_out need not be provided here but must be provided by the
    application for the next call of deflate().
 
@@ -350,8 +350,7 @@ extern int deflateInit2 __P((z_stream *strm,
    reset by the library in this case.
 
       deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
-   not enough memory, Z_STREAM_ERROR if the stream state was inconsistent
-   (such as zalloc being NULL) or the parameters are invalid (such as
+   not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
    an invalid method). msg is set to null if there is no error message.
    deflateInit2 does not perform any compression: this will be done by
    deflate().
@@ -406,7 +405,7 @@ extern int inflateInit2 __P((z_stream *strm,
 
      If next_out is not null, the library will use this buffer for the history
    buffer; the buffer must either be large enough to hold the entire output
-   data, or have at least 1<<(windowBits-1) bytes.  If next_out is null, the
+   data, or have at least 1<<windowBits bytes.  If next_out is null, the
    library will allocate its own buffer (and leave next_out null). next_in
    need not be provided here but must be provided by the application for the
    next call of inflate().
@@ -418,9 +417,8 @@ extern int inflateInit2 __P((z_stream *strm,
    avail_out is zero and all output has been consumed.
 
       inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
-   not enough memory, Z_STREAM_ERROR if the stream state was inconsistent
-   (such as zalloc being NULL) or the parameters are invalid (such as
-   windowBits < 9). msg is set to null if there is no error message.
+   not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
+   windowBits < 8). msg is set to null if there is no error message.
    inflateInit2 does not perform any compression: this will be done by
    inflate().
 */
@@ -585,7 +583,7 @@ extern uLong crc32   __P((uLong crc, Byte *buf, uInt len));
 /*
      Update a running crc with the bytes buf[0..len-1] and return the updated
    crc. If buf is NULL, this function returns the required initial value
-   for the crc (0). Pre- and post-conditioning (one's complement) is performed
+   for the crc. Pre- and post-conditioning (one's complement) is performed
    within this function so it shouldn't be done by the application.
    Usage example:
 
diff --git a/zutil.c b/zutil.c
index 1a2e7ef..9fd4ecc 100644
--- a/zutil.c
+++ b/zutil.c
@@ -3,12 +3,14 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: zutil.c,v 1.3 1995/04/10 09:52:26 jloup Exp $ */
+/* $Id: zutil.c,v 1.5 1995/04/14 21:30:23 jloup Exp $ */
 
 #include <stdio.h>
 
 #include "zutil.h"
 
+extern void exit __P((int));
+
 char *zlib_version = ZLIB_VERSION;
 
 char *z_errmsg[] = {
@@ -136,7 +138,7 @@ voidp zcalloc (voidp opaque, unsigned items, unsigned size)
 
 void  zcfree (voidp opaque, voidp ptr)
 {
-    return _hfree(ptr);
+    _hfree(ptr);
 }
 
 #  endif /* __TURBOC__ ? */
diff --git a/zutil.h b/zutil.h
index a1108e6..20b20f5 100644
--- a/zutil.h
+++ b/zutil.h
@@ -8,7 +8,7 @@
    subject to change. Applications should only use zlib.h.
  */
 
-/* $Id: zutil.h,v 1.4 1995/04/14 10:22:17 jloup Exp $ */
+/* $Id: zutil.h,v 1.5 1995/04/14 21:22:38 jloup Exp $ */
 
 #ifndef _Z_UTIL_H
 #define _Z_UTIL_H
@@ -20,6 +20,10 @@
 #else
     extern int errno;
 #endif
+#ifdef __STDC__
+#  include <string.h>
+#  include <memory.h>
+#endif
 
 #ifndef local
 #  define local static
@@ -154,13 +158,16 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #endif
 
 
+typedef uLong (*check_func) __P((uLong check, Byte *buf, uInt len));
+
 extern void z_error    __P((char *m));
 
 voidp zcalloc __P((voidp opaque, unsigned items, unsigned size));
 void  zcfree  __P((voidp opaque, voidp ptr));
 
-#define ZALLOC(strm, items, size) (*strm->zalloc)(strm->opaque, items, size)
-#define ZFREE(strm, addr)         (*strm->zfree) (strm->opaque, (voidp)addr)
+#define ZALLOC(strm, items, size) \
+           (*((strm)->zalloc))((strm)->opaque, (items), (size))
+#define ZFREE(strm, addr)  (*((strm)->zfree))((strm)->opaque, (voidp)(addr))
 #define TRY_FREE(s, p) {if (p) ZFREE(s, p);}
 
 #endif /* _Z_UTIL_H */