Switch to zlib 1.2.7

5 files changed, 311 insertions, 108 deletions

diff --git a/zlib/contrib/puff/Makefile b/zlib/contrib/puff/Makefile
index b6b69404c..0e2594c80 100644
--- a/zlib/contrib/puff/Makefile
+++ b/zlib/contrib/puff/Makefile
@@ -1,8 +1,42 @@
-puff: puff.c puff.h
-	cc -DTEST -o puff puff.c
+CFLAGS=-O
+
+puff: puff.o pufftest.o
+
+puff.o: puff.h
+
+pufftest.o: puff.h
 
 test: puff
 	puff zeros.raw
 
+puft: puff.c puff.h pufftest.o
+	cc -fprofile-arcs -ftest-coverage -o puft puff.c pufftest.o
+
+# puff full coverage test (should say 100%)
+cov: puft
+	@rm -f *.gcov *.gcda
+	@puft -w zeros.raw 2>&1 | cat > /dev/null
+	@echo '04' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
+	@echo '00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
+	@echo '00 00 00 00 00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 254
+	@echo '00 01 00 fe ff' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
+	@echo '01 01 00 fe ff 0a' | xxd -r -p | puft -f 2>&1 | cat > /dev/null
+	@echo '02 7e ff ff' | xxd -r -p | puft 2> /dev/null || test $$? -eq 246
+	@echo '02' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
+	@echo '04 80 49 92 24 49 92 24 0f b4 ff ff c3 04' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
+	@echo '04 80 49 92 24 49 92 24 71 ff ff 93 11 00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 249
+	@echo '04 c0 81 08 00 00 00 00 20 7f eb 0b 00 00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 246
+	@echo '0b 00 00' | xxd -r -p | puft -f 2>&1 | cat > /dev/null
+	@echo '1a 07' | xxd -r -p | puft 2> /dev/null || test $$? -eq 246
+	@echo '0c c0 81 00 00 00 00 00 90 ff 6b 04' | xxd -r -p | puft 2> /dev/null || test $$? -eq 245
+	@puft -f zeros.raw 2>&1 | cat > /dev/null
+	@echo 'fc 00 00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 253
+	@echo '04 00 fe ff' | xxd -r -p | puft 2> /dev/null || test $$? -eq 252
+	@echo '04 00 24 49' | xxd -r -p | puft 2> /dev/null || test $$? -eq 251
+	@echo '04 80 49 92 24 49 92 24 0f b4 ff ff c3 84' | xxd -r -p | puft 2> /dev/null || test $$? -eq 248
+	@echo '04 00 24 e9 ff ff' | xxd -r -p | puft 2> /dev/null || test $$? -eq 250
+	@echo '04 00 24 e9 ff 6d' | xxd -r -p | puft 2> /dev/null || test $$? -eq 247
+	@gcov -n puff.c
+
 clean:
-	rm -f puff puff.o
+	rm -f puff puft *.o *.gc*
diff --git a/zlib/contrib/puff/puff.c b/zlib/contrib/puff/puff.c
index ce0cc405e..df8470c93 100644
--- a/zlib/contrib/puff/puff.c
+++ b/zlib/contrib/puff/puff.c
@@ -1,8 +1,8 @@
 /*
  * puff.c
- * Copyright (C) 2002-2004 Mark Adler
+ * Copyright (C) 2002-2010 Mark Adler
  * For conditions of distribution and use, see copyright notice in puff.h
- * version 1.8, 9 Jan 2004
+ * version 2.2, 25 Apr 2010
  *
  * puff.c is a simple inflate written to be an unambiguous way to specify the
  * deflate format.  It is not written for speed but rather simplicity.  As a
@@ -49,9 +49,9 @@
  *                      - Fix fixed codes table error
  *                      - Provide a scanning mode for determining size of
  *                        uncompressed data
- * 1.3  20 Mar 2002     - Go back to lengths for puff() parameters [Jean-loup]
+ * 1.3  20 Mar 2002     - Go back to lengths for puff() parameters [Gailly]
  *                      - Add a puff.h file for the interface
- *                      - Add braces in puff() for else do [Jean-loup]
+ *                      - Add braces in puff() for else do [Gailly]
  *                      - Use indexes instead of pointers for readability
  * 1.4  31 Mar 2002     - Simplify construct() code set check
  *                      - Fix some comments
@@ -61,13 +61,27 @@
  * 1.7   3 Mar 2003     - Added test code for distribution
  *                      - Added zlib-like license
  * 1.8   9 Jan 2004     - Added some comments on no distance codes case
+ * 1.9  21 Feb 2008     - Fix bug on 16-bit integer architectures [Pohland]
+ *                      - Catch missing end-of-block symbol error
+ * 2.0  25 Jul 2008     - Add #define to permit distance too far back
+ *                      - Add option in TEST code for puff to write the data
+ *                      - Add option in TEST code to skip input bytes
+ *                      - Allow TEST code to read from piped stdin
+ * 2.1   4 Apr 2010     - Avoid variable initialization for happier compilers
+ *                      - Avoid unsigned comparisons for even happier compilers
+ * 2.2  25 Apr 2010     - Fix bug in variable initializations [Oberhumer]
+ *                      - Add const where appropriate [Oberhumer]
+ *                      - Split if's and ?'s for coverage testing
+ *                      - Break out test code to separate file
+ *                      - Move NIL to puff.h
+ *                      - Allow incomplete code only if single code length is 1
+ *                      - Add full code coverage test to Makefile
  */
 
 #include <setjmp.h>             /* for setjmp(), longjmp(), and jmp_buf */
 #include "puff.h"               /* prototype for puff() */
 
 #define local static            /* for local function definitions */
-#define NIL ((unsigned char *)0)        /* for no output option */
 
 /*
  * Maximums for allocations and loops.  It is not useful to change these --
@@ -87,7 +101,7 @@ struct state {
     unsigned long outcnt;       /* bytes written to out so far */
 
     /* input state */
-    unsigned char *in;          /* input buffer */
+    const unsigned char *in;    /* input buffer */
     unsigned long inlen;        /* available input at in */
     unsigned long incnt;        /* bytes read so far */
     int bitbuf;                 /* bit buffer */
@@ -115,7 +129,8 @@ local int bits(struct state *s, int need)
     /* load at least need bits into val */
     val = s->bitbuf;
     while (s->bitcnt < need) {
-        if (s->incnt == s->inlen) longjmp(s->env, 1);   /* out of input */
+        if (s->incnt == s->inlen)
+            longjmp(s->env, 1);         /* out of input */
         val |= (long)(s->in[s->incnt++]) << s->bitcnt;  /* load eight bits */
         s->bitcnt += 8;
     }
@@ -154,7 +169,8 @@ local int stored(struct state *s)
     s->bitcnt = 0;
 
     /* get length and check against its one's complement */
-    if (s->incnt + 4 > s->inlen) return 2;      /* not enough input */
+    if (s->incnt + 4 > s->inlen)
+        return 2;                               /* not enough input */
     len = s->in[s->incnt++];
     len |= s->in[s->incnt++] << 8;
     if (s->in[s->incnt++] != (~len & 0xff) ||
@@ -162,7 +178,8 @@ local int stored(struct state *s)
         return -2;                              /* didn't match complement! */
 
     /* copy len bytes from in to out */
-    if (s->incnt + len > s->inlen) return 2;    /* not enough input */
+    if (s->incnt + len > s->inlen)
+        return 2;                               /* not enough input */
     if (s->out != NIL) {
         if (s->outcnt + len > s->outlen)
             return 1;                           /* not enough output space */
@@ -194,7 +211,7 @@ struct huffman {
  * Decode a code from the stream s using huffman table h.  Return the symbol or
  * a negative value if there is an error.  If all of the lengths are zero, i.e.
  * an empty code, or if the code is incomplete and an invalid code is received,
- * then -9 is returned after reading MAXBITS bits.
+ * then -10 is returned after reading MAXBITS bits.
  *
  * Format notes:
  *
@@ -214,7 +231,7 @@ struct huffman {
  *   in the deflate format.  See the format notes for fixed() and dynamic().
  */
 #ifdef SLOW
-local int decode(struct state *s, struct huffman *h)
+local int decode(struct state *s, const struct huffman *h)
 {
     int len;            /* current number of bits in code */
     int code;           /* len bits being decoded */
@@ -226,14 +243,14 @@ local int decode(struct state *s, struct huffman *h)
     for (len = 1; len <= MAXBITS; len++) {
         code |= bits(s, 1);             /* get next bit */
         count = h->count[len];
-        if (code < first + count)       /* if length len, return symbol */
+        if (code - count < first)       /* if length len, return symbol */
             return h->symbol[index + (code - first)];
         index += count;                 /* else update for next length */
         first += count;
         first <<= 1;
         code <<= 1;
     }
-    return -9;                          /* ran out of codes */
+    return -10;                         /* ran out of codes */
 }
 
 /*
@@ -242,7 +259,7 @@ local int decode(struct state *s, struct huffman *h)
  * a few percent larger.
  */
 #else /* !SLOW */
-local int decode(struct state *s, struct huffman *h)
+local int decode(struct state *s, const struct huffman *h)
 {
     int len;            /* current number of bits in code */
     int code;           /* len bits being decoded */
@@ -263,7 +280,7 @@ local int decode(struct state *s, struct huffman *h)
             code |= bitbuf & 1;
             bitbuf >>= 1;
             count = *next++;
-            if (code < first + count) { /* if length len, return symbol */
+            if (code - count < first) { /* if length len, return symbol */
                 s->bitbuf = bitbuf;
                 s->bitcnt = (s->bitcnt - len) & 7;
                 return h->symbol[index + (code - first)];
@@ -275,12 +292,15 @@ local int decode(struct state *s, struct huffman *h)
             len++;
         }
         left = (MAXBITS+1) - len;
-        if (left == 0) break;
-        if (s->incnt == s->inlen) longjmp(s->env, 1);   /* out of input */
+        if (left == 0)
+            break;
+        if (s->incnt == s->inlen)
+            longjmp(s->env, 1);         /* out of input */
         bitbuf = s->in[s->incnt++];
-        if (left > 8) left = 8;
+        if (left > 8)
+            left = 8;
     }
-    return -9;                          /* ran out of codes */
+    return -10;                         /* ran out of codes */
 }
 #endif /* SLOW */
 
@@ -316,7 +336,7 @@ local int decode(struct state *s, struct huffman *h)
  * - Within a given code length, the symbols are kept in ascending order for
  *   the code bits definition.
  */
-local int construct(struct huffman *h, short *length, int n)
+local int construct(struct huffman *h, const short *length, int n)
 {
     int symbol;         /* current symbol when stepping through length[] */
     int len;            /* current length when stepping through h->count[] */
@@ -336,7 +356,8 @@ local int construct(struct huffman *h, short *length, int n)
     for (len = 1; len <= MAXBITS; len++) {
         left <<= 1;                     /* one more bit, double codes left */
         left -= h->count[len];          /* deduct count from possible codes */
-        if (left < 0) return left;      /* over-subscribed--return negative */
+        if (left < 0)
+            return left;                /* over-subscribed--return negative */
     }                                   /* left > 0 means incomplete */
 
     /* generate offsets into symbol table for each length for sorting */
@@ -412,8 +433,8 @@ local int construct(struct huffman *h, short *length, int n)
  *   defined to do the wrong thing in this case.
  */
 local int codes(struct state *s,
-                struct huffman *lencode,
-                struct huffman *distcode)
+                const struct huffman *lencode,
+                const struct huffman *distcode)
 {
     int symbol;         /* decoded symbol */
     int len;            /* length for copy */
@@ -436,11 +457,13 @@ local int codes(struct state *s,
     /* decode literals and length/distance pairs */
     do {
         symbol = decode(s, lencode);
-        if (symbol < 0) return symbol;  /* invalid symbol */
+        if (symbol < 0)
+            return symbol;              /* invalid symbol */
         if (symbol < 256) {             /* literal: symbol is the byte */
             /* write out the literal */
             if (s->out != NIL) {
-                if (s->outcnt == s->outlen) return 1;
+                if (s->outcnt == s->outlen)
+                    return 1;
                 s->out[s->outcnt] = symbol;
             }
             s->outcnt++;
@@ -448,21 +471,31 @@ local int codes(struct state *s,
         else if (symbol > 256) {        /* length */
             /* get and compute length */
             symbol -= 257;
-            if (symbol >= 29) return -9;        /* invalid fixed code */
+            if (symbol >= 29)
+                return -10;             /* invalid fixed code */
             len = lens[symbol] + bits(s, lext[symbol]);
 
             /* get and check distance */
             symbol = decode(s, distcode);
-            if (symbol < 0) return symbol;      /* invalid symbol */
+            if (symbol < 0)
+                return symbol;          /* invalid symbol */
             dist = dists[symbol] + bits(s, dext[symbol]);
+#ifndef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
             if (dist > s->outcnt)
-                return -10;     /* distance too far back */
+                return -11;     /* distance too far back */
+#endif
 
             /* copy length bytes from distance bytes back */
             if (s->out != NIL) {
-                if (s->outcnt + len > s->outlen) return 1;
+                if (s->outcnt + len > s->outlen)
+                    return 1;
                 while (len--) {
-                    s->out[s->outcnt] = s->out[s->outcnt - dist];
+                    s->out[s->outcnt] =
+#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
+                        dist > s->outcnt ?
+                            0 :
+#endif
+                            s->out[s->outcnt - dist];
                     s->outcnt++;
                 }
             }
@@ -504,14 +537,19 @@ local int fixed(struct state *s)
     static int virgin = 1;
     static short lencnt[MAXBITS+1], lensym[FIXLCODES];
     static short distcnt[MAXBITS+1], distsym[MAXDCODES];
-    static struct huffman lencode = {lencnt, lensym};
-    static struct huffman distcode = {distcnt, distsym};
+    static struct huffman lencode, distcode;
 
     /* build fixed huffman tables if first call (may not be thread safe) */
     if (virgin) {
         int symbol;
         short lengths[FIXLCODES];
 
+        /* construct lencode and distcode */
+        lencode.count = lencnt;
+        lencode.symbol = lensym;
+        distcode.count = distcnt;
+        distcode.symbol = distsym;
+
         /* literal/length table */
         for (symbol = 0; symbol < 144; symbol++)
             lengths[symbol] = 8;
@@ -631,11 +669,16 @@ local int dynamic(struct state *s)
     short lengths[MAXCODES];            /* descriptor code lengths */
     short lencnt[MAXBITS+1], lensym[MAXLCODES];         /* lencode memory */
     short distcnt[MAXBITS+1], distsym[MAXDCODES];       /* distcode memory */
-    struct huffman lencode = {lencnt, lensym};          /* length code */
-    struct huffman distcode = {distcnt, distsym};       /* distance code */
+    struct huffman lencode, distcode;   /* length and distance codes */
     static const short order[19] =      /* permutation of code length codes */
         {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
 
+    /* construct lencode and distcode */
+    lencode.count = lencnt;
+    lencode.symbol = lensym;
+    distcode.count = distcnt;
+    distcode.symbol = distsym;
+
     /* get number of lengths in each table, check lengths */
     nlen = bits(s, 5) + 257;
     ndist = bits(s, 5) + 1;
@@ -651,7 +694,8 @@ local int dynamic(struct state *s)
 
     /* build huffman table for code lengths codes (use lencode temporarily) */
     err = construct(&lencode, lengths, 19);
-    if (err != 0) return -4;            /* require complete code set here */
+    if (err != 0)               /* require complete code set here */
+        return -4;
 
     /* read length/literal and distance code length tables */
     index = 0;
@@ -665,7 +709,8 @@ local int dynamic(struct state *s)
         else {                          /* repeat instruction */
             len = 0;                    /* assume repeating zeros */
             if (symbol == 16) {         /* repeat last length 3..6 times */
-                if (index == 0) return -5;      /* no last length! */
+                if (index == 0)
+                    return -5;          /* no last length! */
                 len = lengths[index - 1];       /* last length */
                 symbol = 3 + bits(s, 2);
             }
@@ -680,15 +725,19 @@ local int dynamic(struct state *s)
         }
     }
 
+    /* check for end-of-block code -- there better be one! */
+    if (lengths[256] == 0)
+        return -9;
+
     /* build huffman table for literal/length codes */
     err = construct(&lencode, lengths, nlen);
-    if (err < 0 || (err > 0 && nlen - lencode.count[0] != 1))
-        return -7;      /* only allow incomplete codes if just one code */
+    if (err && (err < 0 || nlen != lencode.count[0] + lencode.count[1]))
+        return -7;      /* incomplete code ok only for single length 1 code */
 
     /* build huffman table for distance codes */
     err = construct(&distcode, lengths + nlen, ndist);
-    if (err < 0 || (err > 0 && ndist - distcode.count[0] != 1))
-        return -8;      /* only allow incomplete codes if just one code */
+    if (err && (err < 0 || ndist != distcode.count[0] + distcode.count[1]))
+        return -8;      /* incomplete code ok only for single length 1 code */
 
     /* decode data until end-of-block code */
     return codes(s, &lencode, &distcode);
@@ -724,8 +773,9 @@ local int dynamic(struct state *s)
  *  -6:  dynamic block code description: repeat more than specified lengths
  *  -7:  dynamic block code description: invalid literal/length code lengths
  *  -8:  dynamic block code description: invalid distance code lengths
- *  -9:  invalid literal/length or distance code in fixed or dynamic block
- * -10:  distance is too far back in fixed or dynamic block
+ *  -9:  dynamic block code description: missing end-of-block code
+ * -10:  invalid literal/length or distance code in fixed or dynamic block
+ * -11:  distance is too far back in fixed or dynamic block
  *
  * Format notes:
  *
@@ -739,7 +789,7 @@ local int dynamic(struct state *s)
  */
 int puff(unsigned char *dest,           /* pointer to destination pointer */
          unsigned long *destlen,        /* amount of output space */
-         unsigned char *source,         /* pointer to source data pointer */
+         const unsigned char *source,   /* pointer to source data pointer */
          unsigned long *sourcelen)      /* amount of input available */
 {
     struct state s;             /* input/output state */
@@ -766,11 +816,15 @@ int puff(unsigned char *dest,           /* pointer to destination pointer */
         do {
             last = bits(&s, 1);         /* one if last block */
             type = bits(&s, 2);         /* block type 0..3 */
-            err = type == 0 ? stored(&s) :
-                  (type == 1 ? fixed(&s) :
-                   (type == 2 ? dynamic(&s) :
-                    -1));               /* type == 3, invalid */
-            if (err != 0) break;        /* return with error */
+            err = type == 0 ?
+                    stored(&s) :
+                    (type == 1 ?
+                        fixed(&s) :
+                        (type == 2 ?
+                            dynamic(&s) :
+                            -1));       /* type == 3, invalid */
+            if (err != 0)
+                break;                  /* return with error */
         } while (!last);
     }
 
@@ -781,57 +835,3 @@ int puff(unsigned char *dest,           /* pointer to destination pointer */
     }
     return err;
 }
-
-#ifdef TEST
-/* Example of how to use puff() */
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-
-local unsigned char *yank(char *name, unsigned long *len)
-{
-    unsigned long size;
-    unsigned char *buf;
-    FILE *in;
-    struct stat s;
-
-    *len = 0;
-    if (stat(name, &s)) return NULL;
-    if ((s.st_mode & S_IFMT) != S_IFREG) return NULL;
-    size = (unsigned long)(s.st_size);
-    if (size == 0 || (off_t)size != s.st_size) return NULL;
-    in = fopen(name, "r");
-    if (in == NULL) return NULL;
-    buf = malloc(size);
-    if (buf != NULL && fread(buf, 1, size, in) != size) {
-        free(buf);
-        buf = NULL;
-    }
-    fclose(in);
-    *len = size;
-    return buf;
-}
-
-int main(int argc, char **argv)
-{
-    int ret;
-    unsigned char *source;
-    unsigned long len, sourcelen, destlen;
-
-    if (argc < 2) return 2;
-    source = yank(argv[1], &len);
-    if (source == NULL) return 2;
-    sourcelen = len;
-    ret = puff(NIL, &destlen, source, &sourcelen);
-    if (ret)
-        printf("puff() failed with return code %d\n", ret);
-    else {
-        printf("puff() succeeded uncompressing %lu bytes\n", destlen);
-        if (sourcelen < len) printf("%lu compressed bytes unused\n",
-                                    len - sourcelen);
-    }
-    free(source);
-    return ret;
-}
-#endif
diff --git a/zlib/contrib/puff/puff.h b/zlib/contrib/puff/puff.h
index ef612520b..6a0080ae1 100644
--- a/zlib/contrib/puff/puff.h
+++ b/zlib/contrib/puff/puff.h
@@ -1,6 +1,6 @@
 /* puff.h
-  Copyright (C) 2002, 2003 Mark Adler, all rights reserved
-  version 1.7, 3 Mar 2002
+  Copyright (C) 2002-2010 Mark Adler, all rights reserved
+  version 2.2, 25 Apr 2010
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the author be held liable for any damages
@@ -25,7 +25,11 @@
 /*
  * See puff.c for purpose and usage.
  */
+#ifndef NIL
+#  define NIL ((unsigned char *)0)      /* for no output option */
+#endif
+
 int puff(unsigned char *dest,           /* pointer to destination pointer */
          unsigned long *destlen,        /* amount of output space */
-         unsigned char *source,         /* pointer to source data pointer */
+         const unsigned char *source,   /* pointer to source data pointer */
          unsigned long *sourcelen);     /* amount of input available */
diff --git a/zlib/contrib/puff/pufftest.c b/zlib/contrib/puff/pufftest.c
new file mode 100644
index 000000000..76e35f66b
--- /dev/null
+++ b/zlib/contrib/puff/pufftest.c
@@ -0,0 +1,165 @@
+/*
+ * pufftest.c
+ * Copyright (C) 2002-2010 Mark Adler
+ * For conditions of distribution and use, see copyright notice in puff.h
+ * version 2.2, 25 Apr 2010
+ */
+
+/* Example of how to use puff().
+
+   Usage: puff [-w] [-f] [-nnn] file
+          ... | puff [-w] [-f] [-nnn]
+
+   where file is the input file with deflate data, nnn is the number of bytes
+   of input to skip before inflating (e.g. to skip a zlib or gzip header), and
+   -w is used to write the decompressed data to stdout.  -f is for coverage
+   testing, and causes pufftest to fail with not enough output space (-f does
+   a write like -w, so -w is not required). */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "puff.h"
+
+#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
+#  include <fcntl.h>
+#  include <io.h>
+#  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
+#else
+#  define SET_BINARY_MODE(file)
+#endif
+
+#define local static
+
+/* Return size times approximately the cube root of 2, keeping the result as 1,
+   3, or 5 times a power of 2 -- the result is always > size, until the result
+   is the maximum value of an unsigned long, where it remains.  This is useful
+   to keep reallocations less than ~33% over the actual data. */
+local size_t bythirds(size_t size)
+{
+    int n;
+    size_t m;
+
+    m = size;
+    for (n = 0; m; n++)
+        m >>= 1;
+    if (n < 3)
+        return size + 1;
+    n -= 3;
+    m = size >> n;
+    m += m == 6 ? 2 : 1;
+    m <<= n;
+    return m > size ? m : (size_t)(-1);
+}
+
+/* Read the input file *name, or stdin if name is NULL, into allocated memory.
+   Reallocate to larger buffers until the entire file is read in.  Return a
+   pointer to the allocated data, or NULL if there was a memory allocation
+   failure.  *len is the number of bytes of data read from the input file (even
+   if load() returns NULL).  If the input file was empty or could not be opened
+   or read, *len is zero. */
+local void *load(const char *name, size_t *len)
+{
+    size_t size;
+    void *buf, *swap;
+    FILE *in;
+
+    *len = 0;
+    buf = malloc(size = 4096);
+    if (buf == NULL)
+        return NULL;
+    in = name == NULL ? stdin : fopen(name, "rb");
+    if (in != NULL) {
+        for (;;) {
+            *len += fread((char *)buf + *len, 1, size - *len, in);
+            if (*len < size) break;
+            size = bythirds(size);
+            if (size == *len || (swap = realloc(buf, size)) == NULL) {
+                free(buf);
+                buf = NULL;
+                break;
+            }
+            buf = swap;
+        }
+        fclose(in);
+    }
+    return buf;
+}
+
+int main(int argc, char **argv)
+{
+    int ret, put = 0, fail = 0;
+    unsigned skip = 0;
+    char *arg, *name = NULL;
+    unsigned char *source = NULL, *dest;
+    size_t len = 0;
+    unsigned long sourcelen, destlen;
+
+    /* process arguments */
+    while (arg = *++argv, --argc)
+        if (arg[0] == '-') {
+            if (arg[1] == 'w' && arg[2] == 0)
+                put = 1;
+            else if (arg[1] == 'f' && arg[2] == 0)
+                fail = 1, put = 1;
+            else if (arg[1] >= '0' && arg[1] <= '9')
+                skip = (unsigned)atoi(arg + 1);
+            else {
+                fprintf(stderr, "invalid option %s\n", arg);
+                return 3;
+            }
+        }
+        else if (name != NULL) {
+            fprintf(stderr, "only one file name allowed\n");
+            return 3;
+        }
+        else
+            name = arg;
+    source = load(name, &len);
+    if (source == NULL) {
+        fprintf(stderr, "memory allocation failure\n");
+        return 4;
+    }
+    if (len == 0) {
+        fprintf(stderr, "could not read %s, or it was empty\n",
+                name == NULL ? "<stdin>" : name);
+        free(source);
+        return 3;
+    }
+    if (skip >= len) {
+        fprintf(stderr, "skip request of %d leaves no input\n", skip);
+        free(source);
+        return 3;
+    }
+
+    /* test inflate data with offset skip */
+    len -= skip;
+    sourcelen = (unsigned long)len;
+    ret = puff(NIL, &destlen, source + skip, &sourcelen);
+    if (ret)
+        fprintf(stderr, "puff() failed with return code %d\n", ret);
+    else {
+        fprintf(stderr, "puff() succeeded uncompressing %lu bytes\n", destlen);
+        if (sourcelen < len) fprintf(stderr, "%lu compressed bytes unused\n",
+                                     len - sourcelen);
+    }
+
+    /* if requested, inflate again and write decompressd data to stdout */
+    if (put && ret == 0) {
+        if (fail)
+            destlen >>= 1;
+        dest = malloc(destlen);
+        if (dest == NULL) {
+            fprintf(stderr, "memory allocation failure\n");
+            free(source);
+            return 4;
+        }
+        puff(dest, &destlen, source + skip, &sourcelen);
+        SET_BINARY_MODE(stdout);
+        fwrite(dest, 1, destlen, stdout);
+        free(dest);
+    }
+
+    /* clean up */
+    free(source);
+    return ret;
+}
diff --git a/zlib/contrib/puff/zeros.raw b/zlib/contrib/puff/zeros.raw
index 637b7be6f..0a90e76b3 100644
--- a/zlib/contrib/puff/zeros.raw
+++ b/zlib/contrib/puff/zeros.raw