[gzip] Update sources to zlib 1.2.12.

src/gzip/README.freetype

@@ -1,7 +1,7 @@
 Name: zlib
 Short Name: zlib
 URL: http://zlib.net/
-Version: 1.2.11
+Version: 1.2.12
 License: see `zlib.h`
 
 Description:

src/gzip/gzguts.h

@@ -1,5 +1,5 @@
 /* gzguts.h -- zlib internal header definitions for gz* operations
- * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
+ * Copyright (C) 2004-2019 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -39,7 +39,7 @@
 #  include <io.h>
 #endif
 
-#if defined(_WIN32) || defined(__CYGWIN__)
+#if defined(_WIN32)
 #  define WIDECHAR
 #endif
 
@@ -190,6 +190,7 @@ typedef struct {
         /* just for writing */
     int level;              /* compression level */
     int strategy;           /* compression strategy */
+    int reset;              /* true if a reset is pending after a Z_FINISH */
         /* seek request */
     z_off64_t skip;         /* amount to skip (already rewound if backwards) */
     int seek;               /* true if seek request pending */

src/gzip/infback.c

@@ -1,5 +1,5 @@
 /* infback.c -- inflate using a call-back interface
- * Copyright (C) 1995-2016 Mark Adler
+ * Copyright (C) 1995-2022 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -477,6 +477,7 @@ int ZEXPORT inflateBack(
             }
             Tracev((stderr, "inflate:       codes ok\n"));
             state->mode = LEN;
+                /* fallthrough */
 
         case LEN:
             /* use inflate_fast() if we have enough input and output */

src/gzip/inffast.c

@@ -70,7 +70,7 @@ void ZLIB_INTERNAL inflate_fast(
     code const FAR *dcode;      /* local strm->distcode */
     unsigned lmask;             /* mask for first level of length codes */
     unsigned dmask;             /* mask for first level of distance codes */
-    code here;                  /* retrieved table entry */
+    code const *here;           /* retrieved table entry */
     unsigned op;                /* code bits, operation, extra bits, or */
                                 /*  window position, window bytes to copy */
     unsigned len;               /* match length, unused bytes */
@@ -107,20 +107,20 @@ void ZLIB_INTERNAL inflate_fast(
             hold += (unsigned long)(*in++) << bits;
             bits += 8;
         }
-        here = lcode[hold & lmask];
+        here = lcode + (hold & lmask);
       dolen:
-        op = (unsigned)(here.bits);
+        op = (unsigned)(here->bits);
         hold >>= op;
         bits -= op;
-        op = (unsigned)(here.op);
+        op = (unsigned)(here->op);
         if (op == 0) {                          /* literal */
-            Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
+            Tracevv((stderr, here->val >= 0x20 && here->val < 0x7f ?
                     "inflate:         literal '%c'\n" :
-                    "inflate:         literal 0x%02x\n", here.val));
+                    "inflate:         literal 0x%02x\n", here->val));
-            *out++ = (unsigned char)(here.val);
+            *out++ = (unsigned char)(here->val);
         }
         else if (op & 16) {                     /* length base */
-            len = (unsigned)(here.val);
+            len = (unsigned)(here->val);
             op &= 15;                           /* number of extra bits */
             if (op) {
                 if (bits < op) {
@@ -138,14 +138,14 @@ void ZLIB_INTERNAL inflate_fast(
                 hold += (unsigned long)(*in++) << bits;
                 bits += 8;
             }
-            here = dcode[hold & dmask];
+            here = dcode + (hold & dmask);
           dodist:
-            op = (unsigned)(here.bits);
+            op = (unsigned)(here->bits);
             hold >>= op;
             bits -= op;
-            op = (unsigned)(here.op);
+            op = (unsigned)(here->op);
             if (op & 16) {                      /* distance base */
-                dist = (unsigned)(here.val);
+                dist = (unsigned)(here->val);
                 op &= 15;                       /* number of extra bits */
                 if (bits < op) {
                     hold += (unsigned long)(*in++) << bits;
@@ -264,7 +264,7 @@ void ZLIB_INTERNAL inflate_fast(
                 }
             }
             else if ((op & 64) == 0) {          /* 2nd level distance code */
-                here = dcode[here.val + (hold & ((1U << op) - 1))];
+                here = dcode + here->val + (hold & ((1U << op) - 1));
                 goto dodist;
             }
             else {
@@ -274,7 +274,7 @@ void ZLIB_INTERNAL inflate_fast(
             }
         }
         else if ((op & 64) == 0) {              /* 2nd level length code */
-            here = lcode[here.val + (hold & ((1U << op) - 1))];
+            here = lcode + here->val + (hold & ((1U << op) - 1));
             goto dolen;
         }
         else if (op & 32) {                     /* end-of-block */

src/gzip/inflate.c

@@ -1,5 +1,5 @@
 /* inflate.c -- zlib decompression
- * Copyright (C) 1995-2016 Mark Adler
+ * Copyright (C) 1995-2022 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -132,6 +132,7 @@ int ZEXPORT inflateResetKeep(
     state->mode = HEAD;
     state->last = 0;
     state->havedict = 0;
+    state->flags = -1;
     state->dmax = 32768U;
     state->head = Z_NULL;
     state->hold = 0;
@@ -269,7 +270,7 @@ int ZEXPORT inflatePrime(
     return Z_OK;
 }
 
-#endif  /* Z_FREETYPE */
+#endif  /* !Z_FREETYPE */
 
 /*
    Return state with length and distance decoding tables and index sizes set to
@@ -453,10 +454,10 @@ local int updatewindow(
 
 /* check function to use adler32() for zlib or crc32() for gzip */
 #ifdef GUNZIP
-#  define UPDATE(check, buf, len) \
+#  define UPDATE_CHECK(check, buf, len) \
     (state->flags ? crc32(check, buf, len) : adler32(check, buf, len))
 #else
-#  define UPDATE(check, buf, len) adler32(check, buf, len)
+#  define UPDATE_CHECK(check, buf, len) adler32(check, buf, len)
 #endif
 
 /* check macros for header crc */
@@ -676,7 +677,6 @@ int ZEXPORT inflate(
                 state->mode = FLAGS;
                 break;
             }
-            state->flags = 0;           /* expect zlib header */
             if (state->head != Z_NULL)
                 state->head->done = -1;
             if (!(state->wrap & 1) ||   /* check if zlib header allowed */
@@ -703,6 +703,7 @@ int ZEXPORT inflate(
                 break;
             }
             state->dmax = 1U << len;
+            state->flags = 0;               /* indicate zlib header */
             Tracev((stderr, "inflate:   zlib header ok\n"));
             strm->adler = state->check = adler32(0L, Z_NULL, 0);
             state->mode = hold & 0x200 ? DICTID : TYPE;
@@ -728,6 +729,7 @@ int ZEXPORT inflate(
                 CRC2(state->check, hold);
             INITBITS();
             state->mode = TIME;
+                /* fallthrough */
         case TIME:
             NEEDBITS(32);
             if (state->head != Z_NULL)
@@ -736,6 +738,7 @@ int ZEXPORT inflate(
                 CRC4(state->check, hold);
             INITBITS();
             state->mode = OS;
+                /* fallthrough */
         case OS:
             NEEDBITS(16);
             if (state->head != Z_NULL) {
@@ -746,6 +749,7 @@ int ZEXPORT inflate(
                 CRC2(state->check, hold);
             INITBITS();
             state->mode = EXLEN;
+                /* fallthrough */
         case EXLEN:
             if (state->flags & 0x0400) {
                 NEEDBITS(16);
@@ -759,6 +763,7 @@ int ZEXPORT inflate(
             else if (state->head != Z_NULL)
                 state->head->extra = Z_NULL;
             state->mode = EXTRA;
+                /* fallthrough */
         case EXTRA:
             if (state->flags & 0x0400) {
                 copy = state->length;
@@ -781,6 +786,7 @@ int ZEXPORT inflate(
             }
             state->length = 0;
             state->mode = NAME;
+                /* fallthrough */
         case NAME:
             if (state->flags & 0x0800) {
                 if (have == 0) goto inf_leave;
@@ -802,6 +808,7 @@ int ZEXPORT inflate(
                 state->head->name = Z_NULL;
             state->length = 0;
             state->mode = COMMENT;
+                /* fallthrough */
         case COMMENT:
             if (state->flags & 0x1000) {
                 if (have == 0) goto inf_leave;
@@ -822,6 +829,7 @@ int ZEXPORT inflate(
             else if (state->head != Z_NULL)
                 state->head->comment = Z_NULL;
             state->mode = HCRC;
+                /* fallthrough */
         case HCRC:
             if (state->flags & 0x0200) {
                 NEEDBITS(16);
@@ -845,6 +853,7 @@ int ZEXPORT inflate(
             strm->adler = state->check = ZSWAP32(hold);
             INITBITS();
             state->mode = DICT;
+                /* fallthrough */
         case DICT:
             if (state->havedict == 0) {
                 RESTORE();
@@ -852,8 +861,10 @@ int ZEXPORT inflate(
             }
             strm->adler = state->check = adler32(0L, Z_NULL, 0);
             state->mode = TYPE;
+                /* fallthrough */
         case TYPE:
             if (flush == Z_BLOCK || flush == Z_TREES) goto inf_leave;
+                /* fallthrough */
         case TYPEDO:
             if (state->last) {
                 BYTEBITS();
@@ -904,8 +915,10 @@ int ZEXPORT inflate(
             INITBITS();
             state->mode = COPY_;
             if (flush == Z_TREES) goto inf_leave;
+                /* fallthrough */
         case COPY_:
             state->mode = COPY;
+                /* fallthrough */
         case COPY:
             copy = state->length;
             if (copy) {
@@ -941,6 +954,7 @@ int ZEXPORT inflate(
             Tracev((stderr, "inflate:       table sizes ok\n"));
             state->have = 0;
             state->mode = LENLENS;
+                /* fallthrough */
         case LENLENS:
             while (state->have < state->ncode) {
                 NEEDBITS(3);
@@ -962,6 +976,7 @@ int ZEXPORT inflate(
             Tracev((stderr, "inflate:       code lengths ok\n"));
             state->have = 0;
             state->mode = CODELENS;
+                /* fallthrough */
         case CODELENS:
             while (state->have < state->nlen + state->ndist) {
                 for (;;) {
@@ -1045,8 +1060,10 @@ int ZEXPORT inflate(
             Tracev((stderr, "inflate:       codes ok\n"));
             state->mode = LEN_;
             if (flush == Z_TREES) goto inf_leave;
+                /* fallthrough */
         case LEN_:
             state->mode = LEN;
+                /* fallthrough */
         case LEN:
             if (have >= 6 && left >= 258) {
                 RESTORE();
@@ -1096,6 +1113,7 @@ int ZEXPORT inflate(
             }
             state->extra = (unsigned)(here.op) & 15;
             state->mode = LENEXT;
+                /* fallthrough */
         case LENEXT:
             if (state->extra) {
                 NEEDBITS(state->extra);
@@ -1106,6 +1124,7 @@ int ZEXPORT inflate(
             Tracevv((stderr, "inflate:         length %u\n", state->length));
             state->was = state->length;
             state->mode = DIST;
+                /* fallthrough */
         case DIST:
             for (;;) {
                 here = state->distcode[BITS(state->distbits)];
@@ -1133,6 +1152,7 @@ int ZEXPORT inflate(
             state->offset = (unsigned)here.val;
             state->extra = (unsigned)(here.op) & 15;
             state->mode = DISTEXT;
+                /* fallthrough */
         case DISTEXT:
             if (state->extra) {
                 NEEDBITS(state->extra);
@@ -1149,6 +1169,7 @@ int ZEXPORT inflate(
 #endif
             Tracevv((stderr, "inflate:         distance %u\n", state->offset));
             state->mode = MATCH;
+                /* fallthrough */
         case MATCH:
             if (left == 0) goto inf_leave;
             copy = out - left;
@@ -1208,7 +1229,7 @@ int ZEXPORT inflate(
                 state->total += out;
                 if ((state->wrap & 4) && out)
                     strm->adler = state->check =
-                        UPDATE(state->check, put - out, out);
+                        UPDATE_CHECK(state->check, put - out, out);
                 out = left;
                 if ((state->wrap & 4) && (
 #ifdef GUNZIP
@@ -1224,10 +1245,11 @@ int ZEXPORT inflate(
             }
 #ifdef GUNZIP
             state->mode = LENGTH;
+                /* fallthrough */
         case LENGTH:
             if (state->wrap && state->flags) {
                 NEEDBITS(32);
-                if (hold != (state->total & 0xffffffffUL)) {
+                if ((state->wrap & 4) && hold != (state->total & 0xffffffff)) {
                     strm->msg = (char *)"incorrect length check";
                     state->mode = BAD;
                     break;
@@ -1237,6 +1259,7 @@ int ZEXPORT inflate(
             }
 #endif
             state->mode = DONE;
+                /* fallthrough */
         case DONE:
             ret = Z_STREAM_END;
             goto inf_leave;
@@ -1246,6 +1269,7 @@ int ZEXPORT inflate(
         case MEM:
             return Z_MEM_ERROR;
         case SYNC:
+                /* fallthrough */
         default:
             return Z_STREAM_ERROR;
         }
@@ -1271,7 +1295,7 @@ int ZEXPORT inflate(
     state->total += out;
     if ((state->wrap & 4) && out)
         strm->adler = state->check =
-            UPDATE(state->check, strm->next_out - out, out);
+            UPDATE_CHECK(state->check, strm->next_out - out, out);
     strm->data_type = (int)state->bits + (state->last ? 64 : 0) +
                       (state->mode == TYPE ? 128 : 0) +
                       (state->mode == LEN_ || state->mode == COPY_ ? 256 : 0);
@@ -1409,6 +1433,7 @@ int ZEXPORT inflateSync(
     z_streamp strm)
 {
     unsigned len;               /* number of bytes to look at or looked at */
+    int flags;                  /* temporary to save header status */
     unsigned long in, out;      /* temporary to save total_in and total_out */
     unsigned char buf[4];       /* to restore bit buffer to byte string */
     struct inflate_state FAR *state;
@@ -1441,9 +1466,15 @@ int ZEXPORT inflateSync(
 
     /* return no joy or set up to restart inflate() on a new block */
     if (state->have != 4) return Z_DATA_ERROR;
+    if (state->flags == -1)
+        state->wrap = 0;    /* if no header yet, treat as raw */
+    else
+        state->wrap &= ~4;  /* no point in computing a check value now */
+    flags = state->flags;
     in = strm->total_in;  out = strm->total_out;
     inflateReset(strm);
     strm->total_in = in;  strm->total_out = out;
+    state->flags = flags;
     state->mode = TYPE;
     return Z_OK;
 }
@@ -1468,7 +1499,7 @@ int ZEXPORT inflateSyncPoint(
     return state->mode == STORED && state->bits == 0;
 }
 
-#if !Z_FREETYPE
+#ifndef Z_FREETYPE
 
 int ZEXPORT inflateCopy(
     z_streamp dest,
@@ -1545,7 +1576,7 @@ int ZEXPORT inflateValidate(
 
     if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
     state = (struct inflate_state FAR *)strm->state;
-    if (check)
+    if (check && state->wrap)
         state->wrap |= 4;
     else
         state->wrap &= ~4;

src/gzip/inflate.h

@@ -1,5 +1,5 @@
 /* inflate.h -- internal inflate state definition
- * Copyright (C) 1995-2016 Mark Adler
+ * Copyright (C) 1995-2019 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -89,7 +89,8 @@ struct inflate_state {
     int wrap;                   /* bit 0 true for zlib, bit 1 true for gzip,
                                    bit 2 true to validate check value */
     int havedict;               /* true if dictionary provided */
-    int flags;                  /* gzip header method and flags (0 if zlib) */
+    int flags;                  /* gzip header method and flags, 0 if zlib, or
+                                   -1 if raw or no header yet */
     unsigned dmax;              /* zlib header max distance (INFLATE_STRICT) */
     unsigned long check;        /* protected copy of check value */
     unsigned long total;        /* protected copy of output count */

src/gzip/inftrees.c

@@ -1,5 +1,5 @@
 /* inftrees.c -- generate Huffman trees for efficient decoding
- * Copyright (C) 1995-2017 Mark Adler
+ * Copyright (C) 1995-2022 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -9,7 +9,7 @@
 #define MAXBITS 15
 
 const char inflate_copyright[] =
-   " inflate 1.2.11 Copyright 1995-2017 Mark Adler ";
+   " inflate 1.2.12 Copyright 1995-2022 Mark Adler ";
 /*
   If you use the zlib library in a product, an acknowledgment is welcome
   in the documentation of your product. If for some reason you cannot
@@ -62,7 +62,7 @@ int ZLIB_INTERNAL inflate_table(
         35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
     static const unsigned short lext[31] = { /* Length codes 257..285 extra */
         16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
-        19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 77, 202};
+        19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 199, 202};
     static const unsigned short dbase[32] = { /* Distance codes 0..29 base */
         1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
         257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,

src/gzip/patches/freetype-zlib.diff

@@ -6,8 +6,6 @@ are compiled as part of `src/gzip/ftgzip.c`.
 * src/gzip/adler32.c: Do not define unused functions when `Z_FREETYPE`
 is set.
 
-* src/gzip/crc32.c (DO1, DO8): Undefine.  Already defined in `adler32.c`.
-
 * src/gzip/gzguts.h (COPY): Rename to...
 (COPY__): ... this since `COPY` and `COPY_` conflict with enum values,
 which have the same name in `zlib.h`.
@@ -25,10 +23,10 @@ Omit unused function declarations when `Z_FREETYPE` is defined.
 * src/gzip/inflate.h, src/gzip/inftrees.h: Add header guard macros to
 prevent compiler errors.
 
-diff --git b/src/gzip/adler32.c a/src/gzip/adler32.c
+diff --git a/src/gzip/adler32.c b/src/gzip/adler32.c
 index be5e8a247..aa032e1dd 100644
---- b/src/gzip/adler32.c
+--- a/src/gzip/adler32.c
-+++ a/src/gzip/adler32.c
++++ b/src/gzip/adler32.c
 @@ -7,7 +7,9 @@
  
  #include "zutil.h"
@@ -54,23 +52,10 @@ index be5e8a247..aa032e1dd 100644
  }
 +
 +#endif  /* !Z_FREETYPE */
-diff --git b/src/gzip/crc32.c a/src/gzip/crc32.c
+diff --git a/src/gzip/gzguts.h b/src/gzip/gzguts.h
-index 3e3eb1794..ffced1ea7 100644
+index 57faf3716..4f09a52a7 100644
---- b/src/gzip/crc32.c
+--- a/src/gzip/gzguts.h
-+++ a/src/gzip/crc32.c
++++ b/src/gzip/gzguts.h
-@@ -195,6 +195,8 @@ const z_crc_t FAR * ZEXPORT get_crc_table()
- }
- 
- /* ========================================================================= */
-+#undef DO1
-+#undef DO8
- #define DO1 crc = crc_table[0][((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8)
- #define DO8 DO1; DO1; DO1; DO1; DO1; DO1; DO1; DO1
- 
-diff --git b/src/gzip/gzguts.h a/src/gzip/gzguts.h
-index 990a4d251..c81f8f392 100644
---- b/src/gzip/gzguts.h
-+++ a/src/gzip/gzguts.h
 @@ -163,7 +163,7 @@
  
  /* values for gz_state how */
@@ -80,10 +65,10 @@ index 990a4d251..c81f8f392 100644
  #define GZIP 2      /* decompress a gzip stream */
  
  /* internal gzip file state data structure */
-diff --git b/src/gzip/inflate.c a/src/gzip/inflate.c
+diff --git a/src/gzip/inflate.c b/src/gzip/inflate.c
-index 3f7ea647b..7387e6f57 100644
+index 4375557b4..5bf5b815e 100644
---- b/src/gzip/inflate.c
+--- a/src/gzip/inflate.c
-+++ a/src/gzip/inflate.c
++++ b/src/gzip/inflate.c
 @@ -99,8 +99,10 @@ local int updatewindow OF((z_streamp strm, const unsigned char FAR *end,
  #ifdef BUILDFIXED
     void makefixed OF((void));
@@ -95,7 +80,7 @@ index 3f7ea647b..7387e6f57 100644
  
  local int inflateStateCheck(
      z_streamp strm)
-@@ -244,6 +246,8 @@ int ZEXPORT inflateInit_(
+@@ -245,6 +247,8 @@ int ZEXPORT inflateInit_(
      return inflateInit2_(strm, DEF_WBITS, version, stream_size);
  }
  
@@ -104,16 +89,16 @@ index 3f7ea647b..7387e6f57 100644
  int ZEXPORT inflatePrime(
      z_streamp strm,
      int bits,
-@@ -265,6 +269,8 @@ int ZEXPORT inflatePrime(
+@@ -266,6 +270,8 @@ int ZEXPORT inflatePrime(
      return Z_OK;
  }
  
-+#endif  /* Z_FREETYPE */
++#endif  /* !Z_FREETYPE */
 +
  /*
     Return state with length and distance decoding tables and index sizes set to
     fixed code decoding.  Normally this returns fixed tables from inffixed.h.
-@@ -1288,6 +1294,8 @@ int ZEXPORT inflateEnd(
+@@ -1312,6 +1318,8 @@ int ZEXPORT inflateEnd(
      return Z_OK;
  }
  
@@ -122,7 +107,7 @@ index 3f7ea647b..7387e6f57 100644
  int ZEXPORT inflateGetDictionary(
      z_streamp strm,
      Bytef *dictionary,
-@@ -1440,6 +1448,8 @@ int ZEXPORT inflateSync(
+@@ -1471,6 +1479,8 @@ int ZEXPORT inflateSync(
      return Z_OK;
  }
  
@@ -131,16 +116,16 @@ index 3f7ea647b..7387e6f57 100644
  /*
     Returns true if inflate is currently at the end of a block generated by
     Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
-@@ -1458,6 +1468,8 @@ int ZEXPORT inflateSyncPoint(
+@@ -1489,6 +1499,8 @@ int ZEXPORT inflateSyncPoint(
      return state->mode == STORED && state->bits == 0;
  }
  
-+#if !Z_FREETYPE
++#ifndef Z_FREETYPE
 +
  int ZEXPORT inflateCopy(
      z_streamp dest,
      z_streamp source)
-@@ -1505,6 +1517,8 @@ int ZEXPORT inflateCopy(
+@@ -1536,6 +1548,8 @@ int ZEXPORT inflateCopy(
      return Z_OK;
  }
  
@@ -149,7 +134,7 @@ index 3f7ea647b..7387e6f57 100644
  int ZEXPORT inflateUndermine(
      z_streamp strm,
      int subvert)
-@@ -1538,6 +1552,8 @@ int ZEXPORT inflateValidate(
+@@ -1569,6 +1583,8 @@ int ZEXPORT inflateValidate(
      return Z_OK;
  }
  
@@ -158,16 +143,16 @@ index 3f7ea647b..7387e6f57 100644
  long ZEXPORT inflateMark(
      z_streamp strm)
  {
-@@ -1559,3 +1575,5 @@ unsigned long ZEXPORT inflateCodesUsed(
+@@ -1590,3 +1606,5 @@ unsigned long ZEXPORT inflateCodesUsed(
      state = (struct inflate_state FAR *)strm->state;
      return (unsigned long)(state->next - state->codes);
  }
 +
 +#endif  /* !Z_FREETYPE */
-diff --git b/src/gzip/inflate.h a/src/gzip/inflate.h
+diff --git a/src/gzip/inflate.h b/src/gzip/inflate.h
-index a46cce6b6..92ea758e2 100644
+index f127b6b1f..c6f5a52e1 100644
---- b/src/gzip/inflate.h
+--- a/src/gzip/inflate.h
-+++ a/src/gzip/inflate.h
++++ b/src/gzip/inflate.h
 @@ -3,6 +3,9 @@
   * For conditions of distribution and use, see copyright notice in zlib.h
   */
@@ -178,16 +163,16 @@ index a46cce6b6..92ea758e2 100644
  /* 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.
-@@ -123,3 +126,5 @@ struct inflate_state {
+@@ -124,3 +127,5 @@ struct inflate_state {
      int back;                   /* bits back of last unprocessed length/lit */
      unsigned was;               /* initial length of match */
  };
 +
 +#endif  /* INFLATE_H */
-diff --git b/src/gzip/inftrees.h a/src/gzip/inftrees.h
+diff --git a/src/gzip/inftrees.h b/src/gzip/inftrees.h
 index baa53a0b1..c94eb78b5 100644
---- b/src/gzip/inftrees.h
+--- a/src/gzip/inftrees.h
-+++ a/src/gzip/inftrees.h
++++ b/src/gzip/inftrees.h
 @@ -3,6 +3,9 @@
   * For conditions of distribution and use, see copyright notice in zlib.h
   */
@@ -204,10 +189,10 @@ index baa53a0b1..c94eb78b5 100644
                               unsigned FAR *bits, unsigned short FAR *work));
 +
 +#endif  /* INFTREES_H_ */
-diff --git b/src/gzip/zlib.h a/src/gzip/zlib.h
+diff --git a/src/gzip/zlib.h b/src/gzip/zlib.h
-index f09cdaf1e..1807c0645 100644
+index 4a98e38bf..d760140c2 100644
---- b/src/gzip/zlib.h
+--- a/src/gzip/zlib.h
-+++ a/src/gzip/zlib.h
++++ b/src/gzip/zlib.h
 @@ -31,7 +31,7 @@
  #ifndef ZLIB_H
  #define ZLIB_H
@@ -251,7 +236,7 @@ index f09cdaf1e..1807c0645 100644
  /*
  ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm,
                                       int  level,
-@@ -954,6 +958,8 @@ ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest,
+@@ -956,6 +960,8 @@ ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest,
     destination.
  */
  
@@ -260,7 +245,7 @@ index f09cdaf1e..1807c0645 100644
  ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm));
  /*
       This function is equivalent to inflateEnd followed by inflateInit,
-@@ -978,6 +984,8 @@ ZEXTERN int ZEXPORT inflateReset2 OF((z_streamp strm,
+@@ -980,6 +986,8 @@ ZEXTERN int ZEXPORT inflateReset2 OF((z_streamp strm,
     the windowBits parameter is invalid.
  */
  
@@ -269,7 +254,7 @@ index f09cdaf1e..1807c0645 100644
  ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm,
                                       int bits,
                                       int value));
-@@ -1067,6 +1075,8 @@ ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm,
+@@ -1069,6 +1077,8 @@ ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm,
     stream state was inconsistent.
  */
  
@@ -278,7 +263,7 @@ index f09cdaf1e..1807c0645 100644
  /*
  ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits,
                                          unsigned char FAR *window));
-@@ -1093,6 +1103,8 @@ typedef unsigned (*in_func) OF((void FAR *,
+@@ -1095,6 +1105,8 @@ typedef unsigned (*in_func) OF((void FAR *,
                                  z_const unsigned char FAR * FAR *));
  typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned));
  
@@ -287,7 +272,7 @@ index f09cdaf1e..1807c0645 100644
  ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm,
                                      in_func in, void FAR *in_desc,
                                      out_func out, void FAR *out_desc));
-@@ -1212,6 +1224,8 @@ ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void));
+@@ -1214,6 +1226,8 @@ ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void));
       27-31: 0 (reserved)
   */
  
@@ -296,16 +281,16 @@ index f09cdaf1e..1807c0645 100644
  #ifndef Z_SOLO
  
                          /* utility functions */
-@@ -1739,6 +1753,8 @@ ZEXTERN uLong ZEXPORT crc32   OF((uLong crc, const Bytef *buf, uInt len));
+@@ -1742,6 +1756,8 @@ ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len));
       if (crc != original_crc) error();
  */
  
 +#ifndef Z_FREETYPE
 +
- ZEXTERN uLong ZEXPORT crc32_z OF((uLong adler, const Bytef *buf,
+ ZEXTERN uLong ZEXPORT crc32_z OF((uLong crc, const Bytef *buf,
                                    z_size_t len));
  /*
-@@ -1805,6 +1821,19 @@ ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,
+@@ -1822,6 +1838,19 @@ ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,
                             ZLIB_VERSION, (int)sizeof(z_stream))
  #endif
  
@@ -325,13 +310,14 @@ index f09cdaf1e..1807c0645 100644
  #ifndef Z_SOLO
  
  /* gzgetc() macro and its supporting function and exposed data structure.  Note
-@@ -1879,12 +1908,15 @@ ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file));  /* backward compatibility */
+@@ -1901,13 +1930,16 @@ ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file));  /* backward compatibility */
  
  #else /* Z_SOLO */
  
 +#ifndef Z_FREETYPE
     ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
     ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
+    ZEXTERN uLong ZEXPORT crc32_combine_gen OF((z_off_t));
 +#endif
  
  #endif /* !Z_SOLO */
@@ -341,7 +327,7 @@ index f09cdaf1e..1807c0645 100644
  ZEXTERN const char   * ZEXPORT zError           OF((int));
  ZEXTERN int            ZEXPORT inflateSyncPoint OF((z_streamp));
  ZEXTERN const z_crc_t FAR * ZEXPORT get_crc_table    OF((void));
-@@ -1904,6 +1936,7 @@ ZEXTERN int            ZEXPORTVA gzvprintf Z_ARG((gzFile file,
+@@ -1927,6 +1959,7 @@ ZEXTERN int            ZEXPORTVA gzvprintf Z_ARG((gzFile file,
                                                    va_list va));
  #  endif
  #endif
@@ -349,21 +335,11 @@ index f09cdaf1e..1807c0645 100644
  
  #ifdef __cplusplus
  }
-diff --git b/src/gzip/zutil.h a/src/gzip/zutil.h
+diff --git a/src/gzip/zutil.h b/src/gzip/zutil.h
-index b079ea6a8..2d734a835 100644
+index d9a20ae1b..14f0f1a85 100644
---- b/src/gzip/zutil.h
+--- a/src/gzip/zutil.h
-+++ a/src/gzip/zutil.h
++++ b/src/gzip/zutil.h
-@@ -30,7 +30,9 @@
+@@ -188,6 +188,8 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
- #endif
- 
- #ifdef Z_SOLO
-+#  ifndef Z_FREETYPE
-    typedef long ptrdiff_t;  /* guess -- will be caught if guess is wrong */
-+#  endif
- #endif
- 
- #ifndef local
-@@ -185,6 +187,8 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
    #pragma warn -8066
  #endif
  
@@ -372,7 +348,7 @@ index b079ea6a8..2d734a835 100644
  /* provide prototypes for these when building zlib without LFS */
  #if !defined(_WIN32) && \
      (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
-@@ -192,6 +196,8 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
+@@ -195,6 +197,8 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
      ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
  #endif
  
@@ -381,7 +357,7 @@ index b079ea6a8..2d734a835 100644
          /* common defaults */
  
  #ifndef OS_CODE
-@@ -223,9 +229,9 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
+@@ -226,9 +230,9 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
  #    define zmemcmp _fmemcmp
  #    define zmemzero(dest, len) _fmemset(dest, 0, len)
  #  else

src/gzip/zlib.h

@@ -1,7 +1,7 @@
 /* zlib.h -- interface of the 'zlib' general purpose compression library
-  version 1.2.11, January 15th, 2017
+  version 1.2.12, March 11th, 2022
 
-  Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
+  Copyright (C) 1995-2022 Jean-loup Gailly and Mark Adler
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -37,11 +37,11 @@
 extern "C" {
 #endif
 
-#define ZLIB_VERSION "1.2.11"
+#define ZLIB_VERSION "1.2.12"
-#define ZLIB_VERNUM 0x12b0
+#define ZLIB_VERNUM 0x12c0
 #define ZLIB_VER_MAJOR 1
 #define ZLIB_VER_MINOR 2
-#define ZLIB_VER_REVISION 11
+#define ZLIB_VER_REVISION 12
 #define ZLIB_VER_SUBREVISION 0
 
 /*
@@ -547,8 +547,7 @@ ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm,
                                      int  strategy));
 
      This is another version of deflateInit with more compression options.  The
-   fields next_in, zalloc, zfree and opaque must be initialized before by the
+   fields zalloc, zfree and opaque must be initialized before by the caller.
-   caller.
 
      The method parameter is the compression method.  It must be Z_DEFLATED in
    this version of the library.
@@ -716,11 +715,12 @@ ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm,
    used to switch between compression and straight copy of the input data, or
    to switch to a different kind of input data requiring a different strategy.
    If the compression approach (which is a function of the level) or the
-   strategy is changed, and if any input has been consumed in a previous
+   strategy is changed, and if there have been any deflate() calls since the
-   deflate() call, then the input available so far is compressed with the old
+   state was initialized or reset, then the input available so far is
-   level and strategy using deflate(strm, Z_BLOCK).  There are three approaches
+   compressed with the old level and strategy using deflate(strm, Z_BLOCK).
-   for the compression levels 0, 1..3, and 4..9 respectively.  The new level
+   There are three approaches for the compression levels 0, 1..3, and 4..9
-   and strategy will take effect at the next call of deflate().
+   respectively.  The new level and strategy will take effect at the next call
+   of deflate().
 
      If a deflate(strm, Z_BLOCK) is performed by deflateParams(), and it does
    not have enough output space to complete, then the parameter change will not
@@ -869,9 +869,11 @@ ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,
    detection, or add 16 to decode only the gzip format (the zlib format will
    return a Z_DATA_ERROR).  If a gzip stream is being decoded, strm->adler is a
    CRC-32 instead of an Adler-32.  Unlike the gunzip utility and gzread() (see
-   below), inflate() will not automatically decode concatenated gzip streams.
+   below), inflate() will *not* automatically decode concatenated gzip members.
-   inflate() will return Z_STREAM_END at the end of the gzip stream.  The state
+   inflate() will return Z_STREAM_END at the end of the gzip member.  The state
-   would need to be reset to continue decoding a subsequent gzip stream.
+   would need to be reset to continue decoding a subsequent gzip member.  This
+   *must* be done if there is more data after a gzip member, in order for the
+   decompression to be compliant with the gzip standard (RFC 1952).
 
      inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
    memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
@@ -1316,14 +1318,14 @@ typedef struct gzFile_s *gzFile;    /* semi-opaque gzip file descriptor */
 /*
 ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode));
 
-     Opens a gzip (.gz) file for reading or writing.  The mode parameter is as
+     Open the gzip (.gz) file at path for reading and decompressing, or
-   in fopen ("rb" or "wb") but can also include a compression level ("wb9") or
+   compressing and writing.  The mode parameter is as in fopen ("rb" or "wb")
-   a strategy: 'f' for filtered data as in "wb6f", 'h' for Huffman-only
+   but can also include a compression level ("wb9") or a strategy: 'f' for
-   compression as in "wb1h", 'R' for run-length encoding as in "wb1R", or 'F'
+   filtered data as in "wb6f", 'h' for Huffman-only compression as in "wb1h",
-   for fixed code compression as in "wb9F".  (See the description of
+   'R' for run-length encoding as in "wb1R", or 'F' for fixed code compression
-   deflateInit2 for more information about the strategy parameter.)  'T' will
+   as in "wb9F".  (See the description of deflateInit2 for more information
-   request transparent writing or appending with no compression and not using
+   about the strategy parameter.)  'T' will request transparent writing or
-   the gzip format.
+   appending with no compression and not using the gzip format.
 
      "a" can be used instead of "w" to request that the gzip stream that will
    be written be appended to the file.  "+" will result in an error, since
@@ -1353,9 +1355,9 @@ ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode));
 
 ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode));
 /*
-     gzdopen associates a gzFile with the file descriptor fd.  File descriptors
+     Associate a gzFile with the file descriptor fd.  File descriptors are
-   are obtained from calls like open, dup, creat, pipe or fileno (if the file
+   obtained from calls like open, dup, creat, pipe or fileno (if the file has
-   has been previously opened with fopen).  The mode parameter is as in gzopen.
+   been previously opened with fopen).  The mode parameter is as in gzopen.
 
      The next call of gzclose on the returned gzFile will also close the file
    descriptor fd, just like fclose(fdopen(fd, mode)) closes the file descriptor
@@ -1376,13 +1378,13 @@ ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode));
 
 ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size));
 /*
-     Set the internal buffer size used by this library's functions.  The
+     Set the internal buffer size used by this library's functions for file to
-   default buffer size is 8192 bytes.  This function must be called after
+   size.  The default buffer size is 8192 bytes.  This function must be called
-   gzopen() or gzdopen(), and before any other calls that read or write the
+   after gzopen() or gzdopen(), and before any other calls that read or write
-   file.  The buffer memory allocation is always deferred to the first read or
+   the file.  The buffer memory allocation is always deferred to the first read
-   write.  Three times that size in buffer space is allocated.  A larger buffer
+   or write.  Three times that size in buffer space is allocated.  A larger
-   size of, for example, 64K or 128K bytes will noticeably increase the speed
+   buffer size of, for example, 64K or 128K bytes will noticeably increase the
-   of decompression (reading).
+   speed of decompression (reading).
 
      The new buffer size also affects the maximum length for gzprintf().
 
@@ -1392,9 +1394,9 @@ ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size));
 
 ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy));
 /*
-     Dynamically update the compression level or strategy.  See the description
+     Dynamically update the compression level and strategy for file.  See the
-   of deflateInit2 for the meaning of these parameters.  Previously provided
+   description of deflateInit2 for the meaning of these parameters. Previously
-   data is flushed before the parameter change.
+   provided data is flushed before applying the parameter changes.
 
      gzsetparams returns Z_OK if success, Z_STREAM_ERROR if the file was not
    opened for writing, Z_ERRNO if there is an error writing the flushed data,
@@ -1403,7 +1405,7 @@ ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy));
 
 ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len));
 /*
-     Reads the given number of uncompressed bytes from the compressed file.  If
+     Read and decompress up to len uncompressed bytes from file into buf.  If
    the input file is not in gzip format, gzread copies the given number of
    bytes into the buffer directly from the file.
 
@@ -1434,11 +1436,11 @@ ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len));
 ZEXTERN z_size_t ZEXPORT gzfread OF((voidp buf, z_size_t size, z_size_t nitems,
                                      gzFile file));
 /*
-     Read up to nitems items of size size from file to buf, otherwise operating
+     Read and decompress up to nitems items of size size from file into buf,
-   as gzread() does.  This duplicates the interface of stdio's fread(), with
+   otherwise operating as gzread() does.  This duplicates the interface of
-   size_t request and return types.  If the library defines size_t, then
+   stdio's fread(), with size_t request and return types.  If the library
-   z_size_t is identical to size_t.  If not, then z_size_t is an unsigned
+   defines size_t, then z_size_t is identical to size_t.  If not, then z_size_t
-   integer type that can contain a pointer.
+   is an unsigned integer type that can contain a pointer.
 
      gzfread() returns the number of full items read of size size, or zero if
    the end of the file was reached and a full item could not be read, or if
@@ -1457,18 +1459,16 @@ ZEXTERN z_size_t ZEXPORT gzfread OF((voidp buf, z_size_t size, z_size_t nitems,
    file, reseting and retrying on end-of-file, when size is not 1.
 */
 
-ZEXTERN int ZEXPORT gzwrite OF((gzFile file,
+ZEXTERN int ZEXPORT gzwrite OF((gzFile file, voidpc buf, unsigned len));
-                                voidpc buf, unsigned len));
 /*
-     Writes the given number of uncompressed bytes into the compressed file.
+     Compress and write the len uncompressed bytes at buf to file. gzwrite
-   gzwrite returns the number of uncompressed bytes written or 0 in case of
+   returns the number of uncompressed bytes written or 0 in case of error.
-   error.
 */
 
 ZEXTERN z_size_t ZEXPORT gzfwrite OF((voidpc buf, z_size_t size,
                                       z_size_t nitems, gzFile file));
 /*
-     gzfwrite() writes nitems items of size size from buf to file, duplicating
+     Compress and write nitems items of size size from buf to file, duplicating
    the interface of stdio's fwrite(), with size_t request and return types.  If
    the library defines size_t, then z_size_t is identical to size_t.  If not,
    then z_size_t is an unsigned integer type that can contain a pointer.
@@ -1481,22 +1481,22 @@ ZEXTERN z_size_t ZEXPORT gzfwrite OF((voidpc buf, z_size_t size,
 
 ZEXTERN int ZEXPORTVA gzprintf Z_ARG((gzFile file, const char *format, ...));
 /*
-     Converts, formats, and writes the arguments to the compressed file under
+     Convert, format, compress, and write the arguments (...) to file under
-   control of the format string, as in fprintf.  gzprintf returns the number of
+   control of the string format, as in fprintf.  gzprintf returns the number of
    uncompressed bytes actually written, or a negative zlib error code in case
    of error.  The number of uncompressed bytes written is limited to 8191, or
    one less than the buffer size given to gzbuffer().  The caller should assure
    that this limit is not exceeded.  If it is exceeded, then gzprintf() will
    return an error (0) with nothing written.  In this case, there may also be a
    buffer overflow with unpredictable consequences, which is possible only if
-   zlib was compiled with the insecure functions sprintf() or vsprintf()
+   zlib was compiled with the insecure functions sprintf() or vsprintf(),
    because the secure snprintf() or vsnprintf() functions were not available.
    This can be determined using zlibCompileFlags().
 */
 
 ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s));
 /*
-     Writes the given null-terminated string to the compressed file, excluding
+     Compress and write the given null-terminated string s to file, excluding
    the terminating null character.
 
      gzputs returns the number of characters written, or -1 in case of error.
@@ -1504,11 +1504,12 @@ ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s));
 
 ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len));
 /*
-     Reads bytes from the compressed file until len-1 characters are read, or a
+     Read and decompress bytes from file into buf, until len-1 characters are
-   newline character is read and transferred to buf, or an end-of-file
+   read, or until a newline character is read and transferred to buf, or an
-   condition is encountered.  If any characters are read or if len == 1, the
+   end-of-file condition is encountered.  If any characters are read or if len
-   string is terminated with a null character.  If no characters are read due
+   is one, the string is terminated with a null character.  If no characters
-   to an end-of-file or len < 1, then the buffer is left untouched.
+   are read due to an end-of-file or len is less than one, then the buffer is
+   left untouched.
 
      gzgets returns buf which is a null-terminated string, or it returns NULL
    for end-of-file or in case of error.  If there was an error, the contents at
@@ -1517,13 +1518,13 @@ ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len));
 
 ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c));
 /*
-     Writes c, converted to an unsigned char, into the compressed file.  gzputc
+     Compress and write c, converted to an unsigned char, into file.  gzputc
    returns the value that was written, or -1 in case of error.
 */
 
 ZEXTERN int ZEXPORT gzgetc OF((gzFile file));
 /*
-     Reads one byte from the compressed file.  gzgetc returns this byte or -1
+     Read and decompress one byte from file.  gzgetc returns this byte or -1
    in case of end of file or error.  This is implemented as a macro for speed.
    As such, it does not do all of the checking the other functions do.  I.e.
    it does not check to see if file is NULL, nor whether the structure file
@@ -1532,8 +1533,8 @@ ZEXTERN int ZEXPORT gzgetc OF((gzFile file));
 
 ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file));
 /*
-     Push one character back onto the stream to be read as the first character
+     Push c back onto the stream for file to be read as the first character on
-   on the next read.  At least one character of push-back is allowed.
+   the next read.  At least one character of push-back is always allowed.
    gzungetc() returns the character pushed, or -1 on failure.  gzungetc() will
    fail if c is -1, and may fail if a character has been pushed but not read
    yet.  If gzungetc is used immediately after gzopen or gzdopen, at least the
@@ -1544,9 +1545,9 @@ ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file));
 
 ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush));
 /*
-     Flushes all pending output into the compressed file.  The parameter flush
+     Flush all pending output to file.  The parameter flush is as in the
-   is as in the deflate() function.  The return value is the zlib error number
+   deflate() function.  The return value is the zlib error number (see function
-   (see function gzerror below).  gzflush is only permitted when writing.
+   gzerror below).  gzflush is only permitted when writing.
 
      If the flush parameter is Z_FINISH, the remaining data is written and the
    gzip stream is completed in the output.  If gzwrite() is called again, a new
@@ -1561,8 +1562,8 @@ ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush));
 ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file,
                                    z_off_t offset, int whence));
 
-     Sets the starting position for the next gzread or gzwrite on the given
+     Set the starting position to offset relative to whence for the next gzread
-   compressed file.  The offset represents a number of bytes in the
+   or gzwrite on file.  The offset represents a number of bytes in the
    uncompressed data stream.  The whence parameter is defined as in lseek(2);
    the value SEEK_END is not supported.
 
@@ -1579,18 +1580,18 @@ ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file,
 
 ZEXTERN int ZEXPORT    gzrewind OF((gzFile file));
 /*
-     Rewinds the given file. This function is supported only for reading.
+     Rewind file. This function is supported only for reading.
 
-     gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET)
+     gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET).
 */
 
 /*
 ZEXTERN z_off_t ZEXPORT    gztell OF((gzFile file));
 
-     Returns the starting position for the next gzread or gzwrite on the given
+     Return the starting position for the next gzread or gzwrite on file.
-   compressed file.  This position represents a number of bytes in the
+   This position represents a number of bytes in the uncompressed data stream,
-   uncompressed data stream, and is zero when starting, even if appending or
+   and is zero when starting, even if appending or reading a gzip stream from
-   reading a gzip stream from the middle of a file using gzdopen().
+   the middle of a file using gzdopen().
 
      gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR)
 */
@@ -1598,22 +1599,22 @@ ZEXTERN z_off_t ZEXPORT    gztell OF((gzFile file));
 /*
 ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile file));
 
-     Returns the current offset in the file being read or written.  This offset
+     Return the current compressed (actual) read or write offset of file.  This
-   includes the count of bytes that precede the gzip stream, for example when
+   offset includes the count of bytes that precede the gzip stream, for example
-   appending or when using gzdopen() for reading.  When reading, the offset
+   when appending or when using gzdopen() for reading.  When reading, the
-   does not include as yet unused buffered input.  This information can be used
+   offset does not include as yet unused buffered input.  This information can
-   for a progress indicator.  On error, gzoffset() returns -1.
+   be used for a progress indicator.  On error, gzoffset() returns -1.
 */
 
 ZEXTERN int ZEXPORT gzeof OF((gzFile file));
 /*
-     Returns true (1) if the end-of-file indicator has been set while reading,
+     Return true (1) if the end-of-file indicator for file has been set while
-   false (0) otherwise.  Note that the end-of-file indicator is set only if the
+   reading, false (0) otherwise.  Note that the end-of-file indicator is set
-   read tried to go past the end of the input, but came up short.  Therefore,
+   only if the read tried to go past the end of the input, but came up short.
-   just like feof(), gzeof() may return false even if there is no more data to
+   Therefore, just like feof(), gzeof() may return false even if there is no
-   read, in the event that the last read request was for the exact number of
+   more data to read, in the event that the last read request was for the exact
-   bytes remaining in the input file.  This will happen if the input file size
+   number of bytes remaining in the input file.  This will happen if the input
-   is an exact multiple of the buffer size.
+   file size is an exact multiple of the buffer size.
 
      If gzeof() returns true, then the read functions will return no more data,
    unless the end-of-file indicator is reset by gzclearerr() and the input file
@@ -1622,7 +1623,7 @@ ZEXTERN int ZEXPORT gzeof OF((gzFile file));
 
 ZEXTERN int ZEXPORT gzdirect OF((gzFile file));
 /*
-     Returns true (1) if file is being copied directly while reading, or false
+     Return true (1) if file is being copied directly while reading, or false
    (0) if file is a gzip stream being decompressed.
 
      If the input file is empty, gzdirect() will return true, since the input
@@ -1643,8 +1644,8 @@ ZEXTERN int ZEXPORT gzdirect OF((gzFile file));
 
 ZEXTERN int ZEXPORT    gzclose OF((gzFile file));
 /*
-     Flushes all pending output if necessary, closes the compressed file and
+     Flush all pending output for file, if necessary, close file and
-   deallocates the (de)compression state.  Note that once file is closed, you
+   deallocate the (de)compression state.  Note that once file is closed, you
    cannot call gzerror with file, since its structures have been deallocated.
    gzclose must not be called more than once on the same file, just as free
    must not be called more than once on the same allocation.
@@ -1668,10 +1669,10 @@ ZEXTERN int ZEXPORT gzclose_w OF((gzFile file));
 
 ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum));
 /*
-     Returns the error message for the last error which occurred on the given
+     Return the error message for the last error which occurred on file.
-   compressed file.  errnum is set to zlib error number.  If an error occurred
+   errnum is set to zlib error number.  If an error occurred in the file system
-   in the file system and not in the compression library, errnum is set to
+   and not in the compression library, errnum is set to Z_ERRNO and the
-   Z_ERRNO and the application may consult errno to get the exact error code.
+   application may consult errno to get the exact error code.
 
      The application must not modify the returned string.  Future calls to
    this function may invalidate the previously returned string.  If file is
@@ -1684,7 +1685,7 @@ ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum));
 
 ZEXTERN void ZEXPORT gzclearerr OF((gzFile file));
 /*
-     Clears the error and end-of-file flags for file.  This is analogous to the
+     Clear the error and end-of-file flags for file.  This is analogous to the
    clearerr() function in stdio.  This is useful for continuing to read a gzip
    file that is being written concurrently.
 */
@@ -1702,8 +1703,9 @@ ZEXTERN void ZEXPORT gzclearerr OF((gzFile file));
 ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
 /*
      Update a running Adler-32 checksum with the bytes buf[0..len-1] and
-   return the updated checksum.  If buf is Z_NULL, this function returns the
+   return the updated checksum. An Adler-32 value is in the range of a 32-bit
-   required initial value for the checksum.
+   unsigned integer. If buf is Z_NULL, this function returns the required
+   initial value for the checksum.
 
      An Adler-32 checksum is almost as reliable as a CRC-32 but can be computed
    much faster.
@@ -1736,12 +1738,13 @@ ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2,
    negative, the result has no meaning or utility.
 */
 
-ZEXTERN uLong ZEXPORT crc32   OF((uLong crc, const Bytef *buf, uInt len));
+ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len));
 /*
      Update a running CRC-32 with the bytes buf[0..len-1] and return the
-   updated CRC-32.  If buf is Z_NULL, this function returns the required
+   updated CRC-32. A CRC-32 value is in the range of a 32-bit unsigned integer.
-   initial value for the crc.  Pre- and post-conditioning (one's complement) is
+   If buf is Z_NULL, this function returns the required initial value for the
-   performed within this function so it shouldn't be done by the application.
+   crc. Pre- and post-conditioning (one's complement) is performed within this
+   function so it shouldn't be done by the application.
 
    Usage example:
 
@@ -1755,7 +1758,7 @@ ZEXTERN uLong ZEXPORT crc32   OF((uLong crc, const Bytef *buf, uInt len));
 
 #ifndef Z_FREETYPE
 
-ZEXTERN uLong ZEXPORT crc32_z OF((uLong adler, const Bytef *buf,
+ZEXTERN uLong ZEXPORT crc32_z OF((uLong crc, const Bytef *buf,
                                   z_size_t len));
 /*
      Same as crc32(), but with a size_t length.
@@ -1771,6 +1774,20 @@ ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2));
    len2.
 */
 
+/*
+ZEXTERN uLong ZEXPORT crc32_combine_gen OF((z_off_t len2));
+
+     Return the operator corresponding to length len2, to be used with
+   crc32_combine_op().
+*/
+
+ZEXTERN uLong ZEXPORT crc32_combine_op OF((uLong crc1, uLong crc2, uLong op));
+/*
+     Give the same result as crc32_combine(), using op in place of len2. op is
+   is generated from len2 by crc32_combine_gen(). This will be faster than
+   crc32_combine() if the generated op is used more than once.
+*/
+
 
                         /* various hacks, don't look :) */
 
@@ -1871,6 +1888,7 @@ ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file));  /* backward compatibility */
    ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
    ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off64_t));
    ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off64_t));
+   ZEXTERN uLong ZEXPORT crc32_combine_gen64 OF((z_off64_t));
 #endif
 
 #if !defined(ZLIB_INTERNAL) && defined(Z_WANT64)
@@ -1881,6 +1899,7 @@ ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file));  /* backward compatibility */
 #    define z_gzoffset z_gzoffset64
 #    define z_adler32_combine z_adler32_combine64
 #    define z_crc32_combine z_crc32_combine64
+#    define z_crc32_combine_gen z_crc32_combine_gen64
 #  else
 #    define gzopen gzopen64
 #    define gzseek gzseek64
@@ -1888,6 +1907,7 @@ ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file));  /* backward compatibility */
 #    define gzoffset gzoffset64
 #    define adler32_combine adler32_combine64
 #    define crc32_combine crc32_combine64
+#    define crc32_combine_gen crc32_combine_gen64
 #  endif
 #  ifndef Z_LARGE64
      ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
@@ -1896,6 +1916,7 @@ ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file));  /* backward compatibility */
      ZEXTERN z_off_t ZEXPORT gzoffset64 OF((gzFile));
      ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t));
      ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
+     ZEXTERN uLong ZEXPORT crc32_combine_gen64 OF((z_off_t));
 #  endif
 #else
    ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *));
@@ -1904,6 +1925,7 @@ ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file));  /* backward compatibility */
    ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile));
    ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
    ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
+   ZEXTERN uLong ZEXPORT crc32_combine_gen OF((z_off_t));
 #endif
 
 #else /* Z_SOLO */
@@ -1911,6 +1933,7 @@ ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file));  /* backward compatibility */
 #ifndef Z_FREETYPE
    ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
    ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
+   ZEXTERN uLong ZEXPORT crc32_combine_gen OF((z_off_t));
 #endif
 
 #endif /* !Z_SOLO */
@@ -1925,7 +1948,7 @@ ZEXTERN int            ZEXPORT inflateValidate OF((z_streamp, int));
 ZEXTERN unsigned long  ZEXPORT inflateCodesUsed OF ((z_streamp));
 ZEXTERN int            ZEXPORT inflateResetKeep OF((z_streamp));
 ZEXTERN int            ZEXPORT deflateResetKeep OF((z_streamp));
-#if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(Z_SOLO)
+#if defined(_WIN32) && !defined(Z_SOLO)
 ZEXTERN gzFile         ZEXPORT gzopen_w OF((const wchar_t *path,
                                             const char *mode));
 #endif

src/gzip/zutil.c

@@ -136,8 +136,8 @@ const char * ZEXPORT zError(
     return ERR_MSG(err);
 }
 
-#if defined(_WIN32_WCE)
+#if defined(_WIN32_WCE) && _WIN32_WCE < 0x800
-    /* The Microsoft C Run-Time Library for Windows CE doesn't have
+    /* The older Microsoft C Run-Time Library for Windows CE doesn't have
      * errno.  We define it as a global variable to simplify porting.
      * Its value is always 0 and should not be used.
      */

src/gzip/zutil.h

@@ -1,5 +1,5 @@
 /* zutil.h -- internal interface and configuration of the compression library
- * Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler
+ * Copyright (C) 1995-2022 Jean-loup Gailly, Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -29,12 +29,6 @@
 #  include <stdlib.h>
 #endif
 
-#ifdef Z_SOLO
-#  ifndef Z_FREETYPE
-   typedef long ptrdiff_t;  /* guess -- will be caught if guess is wrong */
-#  endif
-#endif
-
 #ifndef local
 #  define local static
 #endif
@@ -48,6 +42,17 @@ typedef unsigned short ush;
 typedef ush FAR ushf;
 typedef unsigned long  ulg;
 
+#if !defined(Z_U8) && !defined(Z_SOLO) && defined(STDC)
+#  include <limits.h>
+#  if (ULONG_MAX == 0xffffffffffffffff)
+#    define Z_U8 unsigned long
+#  elif (ULLONG_MAX == 0xffffffffffffffff)
+#    define Z_U8 unsigned long long
+#  elif (UINT_MAX == 0xffffffffffffffff)
+#    define Z_U8 unsigned
+#  endif
+#endif
+
 extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
 /* (size given to avoid silly warnings with Visual C++) */
 
@@ -172,10 +177,6 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
 #if (defined(_MSC_VER) && (_MSC_VER > 600)) && !defined __INTERIX
 #  if defined(_WIN32_WCE)
 #    define fdopen(fd,mode) NULL /* No fdopen() */
-#    ifndef _PTRDIFF_T_DEFINED
-       typedef int ptrdiff_t;
-#      define _PTRDIFF_T_DEFINED
-#    endif
 #  else
 #    define fdopen(fd,type)  _fdopen(fd,type)
 #  endif