Use wxVisualAttributes (partially #if'd out until tested further.)

[wxWidgets.git] / src / zlib / gzio.c

diff --git a/src/zlib/gzio.c b/src/zlib/gzio.c
index e29198ac7afaf76999c0c6e00908005cb12a4d68..4afd102b3f35765890ad15df32d02019d1be1fa1 100644 (file)
--- a/src/zlib/gzio.c
+++ b/src/zlib/gzio.c
@@ -1,8 +1,8 @@
 /* gzio.c -- IO on .gz files
 /* gzio.c -- IO on .gz files

- * Copyright (C) 1995-1998 Jean-loup Gailly.
+ * Copyright (C) 1995-2003 Jean-loup Gailly.

  * For conditions of distribution and use, see copyright notice in zlib.h
  *
  * For conditions of distribution and use, see copyright notice in zlib.h
  *

- * Compile this file with -DNO_DEFLATE to avoid the compression code.
+ * Compile this file with -DNO_GZCOMPRESS to avoid the compression code.

  */
 
 /* @(#) $Id$ */
  */
 
 /* @(#) $Id$ */


@@ -11,7 +11,13 @@
 
 #include "zutil.h"
 
 
 #include "zutil.h"
 

+#ifdef NO_DEFLATE       /* for compatiblity with old definition */
+#  define NO_GZCOMPRESS
+#endif
+
+#ifndef NO_DUMMY_DECL

 struct internal_state {int dummy;}; /* for buggy compilers */
 struct internal_state {int dummy;}; /* for buggy compilers */

+#endif

 
 #ifndef Z_BUFSIZE
 #  ifdef MAXSEG_64K
 
 #ifndef Z_BUFSIZE
 #  ifdef MAXSEG_64K


@@ -24,10 +30,20 @@ struct internal_state {int dummy;}; /* for buggy compilers */
 #  define Z_PRINTF_BUFSIZE 4096
 #endif
 
 #  define Z_PRINTF_BUFSIZE 4096
 #endif
 

+#ifdef __MVS__
+#  pragma map (fdopen , "\174\174FDOPEN")
+   FILE *fdopen(int, const char *);
+#endif
+
+#ifndef STDC
+extern voidp  malloc OF((uInt size));
+extern void   free   OF((voidpf ptr));
+#endif
+

 #define ALLOC(size) malloc(size)
 #define TRYFREE(p) {if (p) free(p);}
 
 #define ALLOC(size) malloc(size)
 #define TRYFREE(p) {if (p) free(p);}
 

-static int gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */
+static int const gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */

 
 /* gzip flag byte */
 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
 
 /* gzip flag byte */
 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */


@@ -49,7 +65,11 @@ typedef struct gz_stream {
     char     *path;   /* path name for debugging only */
     int      transparent; /* 1 if input file is not a .gz file */
     char     mode;    /* 'w' or 'r' */
     char     *path;   /* path name for debugging only */
     int      transparent; /* 1 if input file is not a .gz file */
     char     mode;    /* 'w' or 'r' */

-    long     startpos; /* start of compressed data in file (header skipped) */
+    z_off_t  start;   /* start of compressed data in file (header skipped) */
+    z_off_t  in;      /* bytes into deflate or inflate */
+    z_off_t  out;     /* bytes out of deflate or inflate */
+    int      back;    /* one character push-back */
+    int      last;    /* true if push-back is last character */

 } gz_stream;
 
 
 } gz_stream;
 
 


@@ -65,7 +85,7 @@ local uLong  getLong      OF((gz_stream *s));
      Opens a gzip (.gz) file for reading or writing. The mode parameter
    is as in fopen ("rb" or "wb"). The file is given either by file descriptor
    or path name (if fd == -1).
      Opens a gzip (.gz) file for reading or writing. The mode parameter
    is as in fopen ("rb" or "wb"). The file is given either by file descriptor
    or path name (if fd == -1).

-     gz_open return NULL if the file could not be opened or if there was
+     gz_open returns NULL if the file could not be opened or if there was

    insufficient memory to allocate the (de)compression state; errno
    can be checked to distinguish the two cases (if errno is zero, the
    zlib error is Z_MEM_ERROR).
    insufficient memory to allocate the (de)compression state; errno
    can be checked to distinguish the two cases (if errno is zero, the
    zlib error is Z_MEM_ERROR).


@@ -97,6 +117,9 @@ local gzFile gz_open (path, mode, fd)
     s->file = NULL;
     s->z_err = Z_OK;
     s->z_eof = 0;
     s->file = NULL;
     s->z_err = Z_OK;
     s->z_eof = 0;

+    s->in = 0;
+    s->out = 0;
+    s->back = EOF;

     s->crc = crc32(0L, Z_NULL, 0);
     s->msg = NULL;
     s->transparent = 0;
     s->crc = crc32(0L, Z_NULL, 0);
     s->msg = NULL;
     s->transparent = 0;


@@ -112,19 +135,21 @@ local gzFile gz_open (path, mode, fd)
         if (*p == 'r') s->mode = 'r';
         if (*p == 'w' || *p == 'a') s->mode = 'w';
         if (*p >= '0' && *p <= '9') {
         if (*p == 'r') s->mode = 'r';
         if (*p == 'w' || *p == 'a') s->mode = 'w';
         if (*p >= '0' && *p <= '9') {

-           level = *p - '0';
-       } else if (*p == 'f') {
-         strategy = Z_FILTERED;
-       } else if (*p == 'h') {
-         strategy = Z_HUFFMAN_ONLY;
-       } else {
-           *m++ = *p; /* copy the mode */
-       }
+            level = *p - '0';
+        } else if (*p == 'f') {
+          strategy = Z_FILTERED;
+        } else if (*p == 'h') {
+          strategy = Z_HUFFMAN_ONLY;
+        } else if (*p == 'R') {
+          strategy = Z_RLE;
+        } else {
+            *m++ = *p; /* copy the mode */
+        }

     } while (*p++ && m != fmode + sizeof(fmode));
     if (s->mode == '\0') return destroy(s), (gzFile)Z_NULL;
     } while (*p++ && m != fmode + sizeof(fmode));
     if (s->mode == '\0') return destroy(s), (gzFile)Z_NULL;

-    
+

     if (s->mode == 'w') {
     if (s->mode == 'w') {

-#ifdef NO_DEFLATE
+#ifdef NO_GZCOMPRESS

         err = Z_STREAM_ERROR;
 #else
         err = deflateInit2(&(s->stream), level,
         err = Z_STREAM_ERROR;
 #else
         err = deflateInit2(&(s->stream), level,


@@ -163,17 +188,17 @@ local gzFile gz_open (path, mode, fd)
          */
         fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1],
              Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE);
          */
         fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1],
              Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE);

-       s->startpos = 10L;
-       /* We use 10L instead of ftell(s->file) to because ftell causes an
+        s->start = 10L;
+        /* We use 10L instead of ftell(s->file) to because ftell causes an

          * fflush on some systems. This version of the library doesn't use
          * fflush on some systems. This version of the library doesn't use

-         * startpos anyway in write mode, so this initialization is not
+         * start anyway in write mode, so this initialization is not

          * necessary.
          */
     } else {
          * necessary.
          */
     } else {

-       check_header(s); /* skip the .gz header */
-       s->startpos = (ftell(s->file) - s->stream.avail_in);
+        check_header(s); /* skip the .gz header */
+        s->start = ftell(s->file) - s->stream.avail_in;

     }
     }

-    
+

     return (gzFile)s;
 }
 
     return (gzFile)s;
 }
 


@@ -218,11 +243,11 @@ int ZEXPORT gzsetparams (file, level, strategy)
     /* Make room to allow flushing */
     if (s->stream.avail_out == 0) {
 
     /* Make room to allow flushing */
     if (s->stream.avail_out == 0) {
 

-       s->stream.next_out = s->outbuf;
-       if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) {
-           s->z_err = Z_ERRNO;
-       }
-       s->stream.avail_out = Z_BUFSIZE;
+        s->stream.next_out = s->outbuf;
+        if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) {
+            s->z_err = Z_ERRNO;
+        }
+        s->stream.avail_out = Z_BUFSIZE;

     }
 
     return deflateParams (&(s->stream), level, strategy);
     }
 
     return deflateParams (&(s->stream), level, strategy);


@@ -238,14 +263,14 @@ local int get_byte(s)
 {
     if (s->z_eof) return EOF;
     if (s->stream.avail_in == 0) {
 {
     if (s->z_eof) return EOF;
     if (s->stream.avail_in == 0) {

-       errno = 0;
-       s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
-       if (s->stream.avail_in == 0) {
-           s->z_eof = 1;
-           if (ferror(s->file)) s->z_err = Z_ERRNO;
-           return EOF;
-       }
-       s->stream.next_in = s->inbuf;
+        errno = 0;
+        s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
+        if (s->stream.avail_in == 0) {
+            s->z_eof = 1;
+            if (ferror(s->file)) s->z_err = Z_ERRNO;
+            return EOF;
+        }
+        s->stream.next_in = s->inbuf;

     }
     s->stream.avail_in--;
     return *(s->stream.next_in)++;
     }
     s->stream.avail_in--;
     return *(s->stream.next_in)++;


@@ -268,43 +293,57 @@ local void check_header(s)
     uInt len;
     int c;
 
     uInt len;
     int c;
 

-    /* Check the gzip magic header */
-    for (len = 0; len < 2; len++) {
-       c = get_byte(s);
-       if (c != gz_magic[len]) {
-           if (len != 0) s->stream.avail_in++, s->stream.next_in--;
-           if (c != EOF) {
-               s->stream.avail_in++, s->stream.next_in--;
-               s->transparent = 1;
-           }
-           s->z_err = s->stream.avail_in != 0 ? Z_OK : Z_STREAM_END;
-           return;
-       }
+    /* Assure two bytes in the buffer so we can peek ahead -- handle case
+       where first byte of header is at the end of the buffer after the last
+       gzip segment */
+    len = s->stream.avail_in;
+    if (len < 2) {
+        if (len) s->inbuf[0] = s->stream.next_in[0];
+        errno = 0;
+        len = fread(s->inbuf + len, 1, Z_BUFSIZE >> len, s->file);
+        if (len == 0 && ferror(s->file)) s->z_err = Z_ERRNO;
+        s->stream.avail_in += len;
+        s->stream.next_in = s->inbuf;
+        if (s->stream.avail_in < 2) {
+            s->transparent = s->stream.avail_in;
+            return;
+        }

     }
     }

+
+    /* Peek ahead to check the gzip magic header */
+    if (s->stream.next_in[0] != gz_magic[0] ||
+        s->stream.next_in[1] != gz_magic[1]) {
+        s->transparent = 1;
+        return;
+    }
+    s->stream.avail_in -= 2;
+    s->stream.next_in += 2;
+
+    /* Check the rest of the gzip header */

     method = get_byte(s);
     flags = get_byte(s);
     if (method != Z_DEFLATED || (flags & RESERVED) != 0) {
     method = get_byte(s);
     flags = get_byte(s);
     if (method != Z_DEFLATED || (flags & RESERVED) != 0) {

-       s->z_err = Z_DATA_ERROR;
-       return;
+        s->z_err = Z_DATA_ERROR;
+        return;

     }
 
     /* Discard time, xflags and OS code: */
     for (len = 0; len < 6; len++) (void)get_byte(s);
 
     if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */
     }
 
     /* Discard time, xflags and OS code: */
     for (len = 0; len < 6; len++) (void)get_byte(s);
 
     if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */

-       len  =  (uInt)get_byte(s);
-       len += ((uInt)get_byte(s))<<8;
-       /* len is garbage if EOF but the loop below will quit anyway */
-       while (len-- != 0 && get_byte(s) != EOF) ;
+        len  =  (uInt)get_byte(s);
+        len += ((uInt)get_byte(s))<<8;
+        /* len is garbage if EOF but the loop below will quit anyway */
+        while (len-- != 0 && get_byte(s) != EOF) ;

     }
     if ((flags & ORIG_NAME) != 0) { /* skip the original file name */
     }
     if ((flags & ORIG_NAME) != 0) { /* skip the original file name */

-       while ((c = get_byte(s)) != 0 && c != EOF) ;
+        while ((c = get_byte(s)) != 0 && c != EOF) ;

     }
     if ((flags & COMMENT) != 0) {   /* skip the .gz file comment */
     }
     if ((flags & COMMENT) != 0) {   /* skip the .gz file comment */

-       while ((c = get_byte(s)) != 0 && c != EOF) ;
+        while ((c = get_byte(s)) != 0 && c != EOF) ;

     }
     if ((flags & HEAD_CRC) != 0) {  /* skip the header crc */
     }
     if ((flags & HEAD_CRC) != 0) {  /* skip the header crc */

-       for (len = 0; len < 2; len++) (void)get_byte(s);
+        for (len = 0; len < 2; len++) (void)get_byte(s);

     }
     s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK;
 }
     }
     s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK;
 }


@@ -323,21 +362,21 @@ local int destroy (s)
     TRYFREE(s->msg);
 
     if (s->stream.state != NULL) {
     TRYFREE(s->msg);
 
     if (s->stream.state != NULL) {

-       if (s->mode == 'w') {
-#ifdef NO_DEFLATE
-           err = Z_STREAM_ERROR;
+        if (s->mode == 'w') {
+#ifdef NO_GZCOMPRESS
+            err = Z_STREAM_ERROR;

 #else
 #else

-           err = deflateEnd(&(s->stream));
+            err = deflateEnd(&(s->stream));

 #endif
 #endif

-       } else if (s->mode == 'r') {
-           err = inflateEnd(&(s->stream));
-       }
+        } else if (s->mode == 'r') {
+            err = inflateEnd(&(s->stream));
+        }

     }
     if (s->file != NULL && fclose(s->file)) {
 #ifdef ESPIPE
     }
     if (s->file != NULL && fclose(s->file)) {
 #ifdef ESPIPE

-       if (errno != ESPIPE) /* fclose is broken for pipes in HP/UX */
+        if (errno != ESPIPE) /* fclose is broken for pipes in HP/UX */

 #endif
 #endif

-           err = Z_ERRNO;
+            err = Z_ERRNO;

     }
     if (s->z_err < 0) err = s->z_err;
 
     }
     if (s->z_err < 0) err = s->z_err;
 


@@ -370,67 +409,82 @@ int ZEXPORT gzread (file, buf, len)
     s->stream.next_out = (Bytef*)buf;
     s->stream.avail_out = len;
 
     s->stream.next_out = (Bytef*)buf;
     s->stream.avail_out = len;
 

+    if (s->stream.avail_out && s->back != EOF) {
+        *next_out++ = s->back;
+        s->stream.next_out++;
+        s->stream.avail_out--;
+        s->back = EOF;
+        s->out++;
+        if (s->last) {
+            s->z_err = Z_STREAM_END;
+            return 1;
+        }
+    }
+

     while (s->stream.avail_out != 0) {
 
     while (s->stream.avail_out != 0) {
 

-       if (s->transparent) {
-           /* Copy first the lookahead bytes: */
-           uInt n = s->stream.avail_in;
-           if (n > s->stream.avail_out) n = s->stream.avail_out;
-           if (n > 0) {
-               zmemcpy(s->stream.next_out, s->stream.next_in, n);
-               next_out += n;
-               s->stream.next_out = next_out;
-               s->stream.next_in   += n;
-               s->stream.avail_out -= n;
-               s->stream.avail_in  -= n;
-           }
-           if (s->stream.avail_out > 0) {
-               s->stream.avail_out -= fread(next_out, 1, s->stream.avail_out,
-                                            s->file);
-           }
-           len -= s->stream.avail_out;
-           s->stream.total_in  += (uLong)len;
-           s->stream.total_out += (uLong)len;
+        if (s->transparent) {
+            /* Copy first the lookahead bytes: */
+            uInt n = s->stream.avail_in;
+            if (n > s->stream.avail_out) n = s->stream.avail_out;
+            if (n > 0) {
+                zmemcpy(s->stream.next_out, s->stream.next_in, n);
+                next_out += n;
+                s->stream.next_out = next_out;
+                s->stream.next_in   += n;
+                s->stream.avail_out -= n;
+                s->stream.avail_in  -= n;
+            }
+            if (s->stream.avail_out > 0) {
+                s->stream.avail_out -= fread(next_out, 1, s->stream.avail_out,
+                                             s->file);
+            }
+            len -= s->stream.avail_out;
+            s->in  += len;
+            s->out += len;

             if (len == 0) s->z_eof = 1;
             if (len == 0) s->z_eof = 1;

-           return (int)len;
-       }
+            return (int)len;
+        }

         if (s->stream.avail_in == 0 && !s->z_eof) {
 
             errno = 0;
             s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
             if (s->stream.avail_in == 0) {
                 s->z_eof = 1;
         if (s->stream.avail_in == 0 && !s->z_eof) {
 
             errno = 0;
             s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
             if (s->stream.avail_in == 0) {
                 s->z_eof = 1;

-               if (ferror(s->file)) {
-                   s->z_err = Z_ERRNO;
-                   break;
-               }
+                if (ferror(s->file)) {
+                    s->z_err = Z_ERRNO;
+                    break;
+                }

             }
             s->stream.next_in = s->inbuf;
         }
             }
             s->stream.next_in = s->inbuf;
         }

+        s->in += s->stream.avail_in;
+        s->out += s->stream.avail_out;

         s->z_err = inflate(&(s->stream), Z_NO_FLUSH);
         s->z_err = inflate(&(s->stream), Z_NO_FLUSH);

-
-       if (s->z_err == Z_STREAM_END) {
-           /* Check CRC and original size */
-           s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
-           start = s->stream.next_out;
-
-           if (getLong(s) != s->crc || getLong(s) != s->stream.total_out) {
-               s->z_err = Z_DATA_ERROR;
-           } else {
-               /* Check for concatenated .gz files: */
-               check_header(s);
-               if (s->z_err == Z_OK) {
-                   uLong total_in = s->stream.total_in;
-                   uLong total_out = s->stream.total_out;
-
-                   inflateReset(&(s->stream));
-                   s->stream.total_in = total_in;
-                   s->stream.total_out = total_out;
-                   s->crc = crc32(0L, Z_NULL, 0);
-               }
-           }
-       }
-       if (s->z_err != Z_OK || s->z_eof) break;
+        s->in -= s->stream.avail_in;
+        s->out -= s->stream.avail_out;
+
+        if (s->z_err == Z_STREAM_END) {
+            /* Check CRC and original size */
+            s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
+            start = s->stream.next_out;
+
+            if (getLong(s) != s->crc) {
+                s->z_err = Z_DATA_ERROR;
+            } else {
+                (void)getLong(s);
+                /* The uncompressed length returned by above getlong() may be
+                 * different from s->out in case of concatenated .gz files.
+                 * Check for such files:
+                 */
+                check_header(s);
+                if (s->z_err == Z_OK) {
+                    inflateReset(&(s->stream));
+                    s->crc = crc32(0L, Z_NULL, 0);
+                }
+            }
+        }
+        if (s->z_err != Z_OK || s->z_eof) break;

     }
     s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
 
     }
     s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
 


@@ -451,6 +505,25 @@ int ZEXPORT gzgetc(file)
 }
 
 
 }
 
 

+/* ===========================================================================
+      Push one byte back onto the stream.
+*/
+int ZEXPORT gzungetc(c, file)
+    int c;
+    gzFile file;
+{
+    gz_stream *s = (gz_stream*)file;
+
+    if (s == NULL || s->mode != 'r' || c == EOF || s->back != EOF) return EOF;
+    s->back = c;
+    s->out--;
+    s->last = (s->z_err == Z_STREAM_END);
+    if (s->last) s->z_err = Z_OK;
+    s->z_eof = 0;
+    return c;
+}
+
+

 /* ===========================================================================
       Reads bytes from the compressed file until len-1 characters are
    read, or a newline character is read and transferred to buf, or an
 /* ===========================================================================
       Reads bytes from the compressed file until len-1 characters are
    read, or a newline character is read and transferred to buf, or an


@@ -474,14 +547,14 @@ char * ZEXPORT gzgets(file, buf, len)
 }
 
 
 }
 
 

-#ifndef NO_DEFLATE
+#ifndef NO_GZCOMPRESS

 /* ===========================================================================
      Writes the given number of uncompressed bytes into the compressed file.
    gzwrite returns the number of bytes actually written (0 in case of error).
 */
 int ZEXPORT gzwrite (file, buf, len)
     gzFile file;
 /* ===========================================================================
      Writes the given number of uncompressed bytes into the compressed file.
    gzwrite returns the number of bytes actually written (0 in case of error).
 */
 int ZEXPORT gzwrite (file, buf, len)
     gzFile file;

-    const voidp buf;
+    voidpc buf;

     unsigned len;
 {
     gz_stream *s = (gz_stream*)file;
     unsigned len;
 {
     gz_stream *s = (gz_stream*)file;


@@ -502,7 +575,11 @@ int ZEXPORT gzwrite (file, buf, len)
             }
             s->stream.avail_out = Z_BUFSIZE;
         }
             }
             s->stream.avail_out = Z_BUFSIZE;
         }

+        s->in += s->stream.avail_in;
+        s->out += s->stream.avail_out;

         s->z_err = deflate(&(s->stream), Z_NO_FLUSH);
         s->z_err = deflate(&(s->stream), Z_NO_FLUSH);

+        s->in -= s->stream.avail_in;
+        s->out -= s->stream.avail_out;

         if (s->z_err != Z_OK) break;
     }
     s->crc = crc32(s->crc, (const Bytef *)buf, len);
         if (s->z_err != Z_OK) break;
     }
     s->crc = crc32(s->crc, (const Bytef *)buf, len);


@@ -510,6 +587,7 @@ int ZEXPORT gzwrite (file, buf, len)
     return (int)(len - s->stream.avail_in);
 }
 
     return (int)(len - s->stream.avail_in);
 }
 

+

 /* ===========================================================================
      Converts, formats, and writes the args to the compressed file under
    control of the format string, as in fprintf. gzprintf returns the number of
 /* ===========================================================================
      Converts, formats, and writes the args to the compressed file under
    control of the format string, as in fprintf. gzprintf returns the number of


@@ -524,40 +602,67 @@ int ZEXPORTVA gzprintf (gzFile file, const char *format, /* args */ ...)
     va_list va;
     int len;
 
     va_list va;
     int len;
 

+    buf[sizeof(buf) - 1] = 0;

     va_start(va, format);
     va_start(va, format);

-#ifdef HAS_vsnprintf
-    (void)vsnprintf(buf, sizeof(buf), format, va);
-#else
+#ifdef NO_vsnprintf
+#  ifdef HAS_vsprintf_void

     (void)vsprintf(buf, format, va);
     (void)vsprintf(buf, format, va);

-#endif

     va_end(va);
     va_end(va);

-    len = strlen(buf); /* some *sprintf don't return the nb of bytes written */
-    if (len <= 0) return 0;
-
+    for (len = 0; len < sizeof(buf); len++)
+        if (buf[len] == 0) break;
+#  else
+    len = vsprintf(buf, format, va);
+    va_end(va);
+#  endif
+#else
+#  ifdef HAS_vsnprintf_void
+    (void)vsnprintf(buf, sizeof(buf), format, va);
+    va_end(va);
+    len = strlen(buf);
+#  else
+    len = vsnprintf(buf, sizeof(buf), format, va);
+    va_end(va);
+#  endif
+#endif
+    if (len <= 0 || len >= (int)sizeof(buf) || buf[sizeof(buf) - 1] != 0)
+        return 0;

     return gzwrite(file, buf, (unsigned)len);
 }
 #else /* not ANSI C */
 
 int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
     return gzwrite(file, buf, (unsigned)len);
 }
 #else /* not ANSI C */
 
 int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,

-                      a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
+                       a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)

     gzFile file;
     const char *format;
     int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
     gzFile file;
     const char *format;
     int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,

-       a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
+        a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;

 {
     char buf[Z_PRINTF_BUFSIZE];
     int len;
 
 {
     char buf[Z_PRINTF_BUFSIZE];
     int len;
 

-#ifdef HAS_snprintf
-    snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8,
-            a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
-#else
+    buf[sizeof(buf) - 1] = 0;
+#ifdef NO_snprintf
+#  ifdef HAS_sprintf_void

     sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8,
     sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8,

-           a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+            a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+    for (len = 0; len < sizeof(buf); len++)
+        if (buf[len] == 0) break;
+#  else
+    len = sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8,
+                a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+#  endif
+#else
+#  ifdef HAS_snprintf_void
+    snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8,
+             a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+    len = strlen(buf);
+#  else
+    len = snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8,
+                 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+#  endif

 #endif
 #endif

-    len = strlen(buf); /* old sprintf doesn't return the nb of bytes written */
-    if (len <= 0) return 0;
-
+    if (len <= 0 || len >= sizeof(buf) || buf[sizeof(buf) - 1] != 0)
+        return 0;

     return gzwrite(file, buf, len);
 }
 #endif
     return gzwrite(file, buf, len);
 }
 #endif


@@ -617,16 +722,18 @@ local int do_flush (file, flush)
             s->stream.avail_out = Z_BUFSIZE;
         }
         if (done) break;
             s->stream.avail_out = Z_BUFSIZE;
         }
         if (done) break;

+        s->out += s->stream.avail_out;

         s->z_err = deflate(&(s->stream), flush);
         s->z_err = deflate(&(s->stream), flush);

+        s->out -= s->stream.avail_out;

 
 

-       /* Ignore the second of two consecutive flushes: */
-       if (len == 0 && s->z_err == Z_BUF_ERROR) s->z_err = Z_OK;
+        /* Ignore the second of two consecutive flushes: */
+        if (len == 0 && s->z_err == Z_BUF_ERROR) s->z_err = Z_OK;

 
         /* deflate has finished flushing only when it hasn't used up
 
         /* deflate has finished flushing only when it hasn't used up

-         * all the available space in the output buffer: 
+         * all the available space in the output buffer:

          */
         done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END);
          */
         done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END);

- 
+

         if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break;
     }
     return  s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
         if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break;
     }
     return  s->z_err == Z_STREAM_END ? Z_OK : s->z_err;


@@ -643,7 +750,7 @@ int ZEXPORT gzflush (file, flush)
     fflush(s->file);
     return  s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
 }
     fflush(s->file);
     return  s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
 }

-#endif /* NO_DEFLATE */
+#endif /* NO_GZCOMPRESS */

 
 /* ===========================================================================
       Sets the starting position for the next gzread or gzwrite on the given
 
 /* ===========================================================================
       Sets the starting position for the next gzread or gzwrite on the given


@@ -661,98 +768,105 @@ z_off_t ZEXPORT gzseek (file, offset, whence)
     gz_stream *s = (gz_stream*)file;
 
     if (s == NULL || whence == SEEK_END ||
     gz_stream *s = (gz_stream*)file;
 
     if (s == NULL || whence == SEEK_END ||

-       s->z_err == Z_ERRNO || s->z_err == Z_DATA_ERROR) {
-       return -1L;
+        s->z_err == Z_ERRNO || s->z_err == Z_DATA_ERROR) {
+        return -1L;

     }
     }

-    
+

     if (s->mode == 'w') {
     if (s->mode == 'w') {

-#ifdef NO_DEFLATE
-       return -1L;
+#ifdef NO_GZCOMPRESS
+        return -1L;

 #else
 #else

-       if (whence == SEEK_SET) {
-           offset -= s->stream.total_out;
-       }
-       if (offset < 0) return -1L;
-
-       /* At this point, offset is the number of zero bytes to write. */
-       if (s->inbuf == Z_NULL) {
-           s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); /* for seeking */
-           zmemzero(s->inbuf, Z_BUFSIZE);
-       }
-       while (offset > 0)  {
-           uInt size = Z_BUFSIZE;
-           if (offset < Z_BUFSIZE) size = (uInt)offset;
-
-           size = gzwrite(file, s->inbuf, size);
-           if (size == 0) return -1L;
-
-           offset -= size;
-       }
-       return (z_off_t)s->stream.total_in;
+        if (whence == SEEK_SET) {
+            offset -= s->in;
+        }
+        if (offset < 0) return -1L;
+
+        /* At this point, offset is the number of zero bytes to write. */
+        if (s->inbuf == Z_NULL) {
+            s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); /* for seeking */
+            if (s->inbuf == Z_NULL) return -1L;
+            zmemzero(s->inbuf, Z_BUFSIZE);
+        }
+        while (offset > 0)  {
+            uInt size = Z_BUFSIZE;
+            if (offset < Z_BUFSIZE) size = (uInt)offset;
+
+            size = gzwrite(file, s->inbuf, size);
+            if (size == 0) return -1L;
+
+            offset -= size;
+        }
+        return s->in;

 #endif
     }
     /* Rest of function is for reading only */
 
     /* compute absolute position */
     if (whence == SEEK_CUR) {
 #endif
     }
     /* Rest of function is for reading only */
 
     /* compute absolute position */
     if (whence == SEEK_CUR) {

-       offset += s->stream.total_out;
+        offset += s->out;

     }
     if (offset < 0) return -1L;
 
     if (s->transparent) {
     }
     if (offset < 0) return -1L;
 
     if (s->transparent) {

-       /* map to fseek */
-       s->stream.avail_in = 0;
-       s->stream.next_in = s->inbuf;
+        /* map to fseek */
+        s->back = EOF;
+        s->stream.avail_in = 0;
+        s->stream.next_in = s->inbuf;

         if (fseek(s->file, offset, SEEK_SET) < 0) return -1L;
 
         if (fseek(s->file, offset, SEEK_SET) < 0) return -1L;
 

-       s->stream.total_in = s->stream.total_out = (uLong)offset;
-       return offset;
+        s->in = s->out = offset;
+        return offset;

     }
 
     /* For a negative seek, rewind and use positive seek */
     }
 
     /* For a negative seek, rewind and use positive seek */

-    if ((uLong)offset >= s->stream.total_out) {
-       offset -= s->stream.total_out;
+    if (offset >= s->out) {
+        offset -= s->out;

     } else if (gzrewind(file) < 0) {
     } else if (gzrewind(file) < 0) {

-       return -1L;
+        return -1L;

     }
     /* offset is now the number of bytes to skip. */
 
     if (offset != 0 && s->outbuf == Z_NULL) {
     }
     /* offset is now the number of bytes to skip. */
 
     if (offset != 0 && s->outbuf == Z_NULL) {

-       s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
+        s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
+        if (s->outbuf == Z_NULL) return -1L;
+    }
+    if (offset && s->back != EOF) {
+        s->back = EOF;
+        s->out++;
+        offset--;
+        if (s->last) s->z_err = Z_STREAM_END;

     }
     while (offset > 0)  {
     }
     while (offset > 0)  {

-       int size = Z_BUFSIZE;
-       if (offset < Z_BUFSIZE) size = (int)offset;
+        int size = Z_BUFSIZE;
+        if (offset < Z_BUFSIZE) size = (int)offset;

 
 

-       size = gzread(file, s->outbuf, (uInt)size);
-       if (size <= 0) return -1L;
-       offset -= size;
+        size = gzread(file, s->outbuf, (uInt)size);
+        if (size <= 0) return -1L;
+        offset -= size;

     }
     }

-    return (z_off_t)s->stream.total_out;
+    return s->out;

 }
 
 /* ===========================================================================
 }
 
 /* ===========================================================================

-     Rewinds input file. 
+     Rewinds input file.

 */
 int ZEXPORT gzrewind (file)
     gzFile file;
 {
     gz_stream *s = (gz_stream*)file;
 */
 int ZEXPORT gzrewind (file)
     gzFile file;
 {
     gz_stream *s = (gz_stream*)file;

-    
+

     if (s == NULL || s->mode != 'r') return -1;
 
     s->z_err = Z_OK;
     s->z_eof = 0;
     if (s == NULL || s->mode != 'r') return -1;
 
     s->z_err = Z_OK;
     s->z_eof = 0;

+    s->back = EOF;

     s->stream.avail_in = 0;
     s->stream.next_in = s->inbuf;
     s->stream.avail_in = 0;
     s->stream.next_in = s->inbuf;

-       
-    if (s->startpos == 0) { /* not a compressed file */
-       rewind(s->file);
-       return 0;
-    }
-
-    (void) inflateReset(&s->stream);
-    return fseek(s->file, s->startpos, SEEK_SET);
+    s->crc = crc32(0L, Z_NULL, 0);
+    if (!s->transparent) (void)inflateReset(&s->stream);
+    s->in = 0;
+    s->out = 0;
+    return fseek(s->file, s->start, SEEK_SET);

 }
 
 /* ===========================================================================
 }
 
 /* ===========================================================================


@@ -774,8 +888,14 @@ int ZEXPORT gzeof (file)
     gzFile file;
 {
     gz_stream *s = (gz_stream*)file;
     gzFile file;
 {
     gz_stream *s = (gz_stream*)file;

-    
-    return (s == NULL || s->mode != 'r') ? 0 : s->z_eof;
+
+    /* With concatenated compressed files that can have embedded
+     * crc trailers, z_eof is no longer the only/best indicator of EOF
+     * on a gz_stream. Handle end-of-stream error explicitly here.
+     */
+    if (s == NULL || s->mode != 'r') return 0;
+    if (s->z_eof) return 1;
+    return s->z_err == Z_STREAM_END;

 }
 
 /* ===========================================================================
 }
 
 /* ===========================================================================


@@ -793,7 +913,8 @@ local void putLong (file, x)
 }
 
 /* ===========================================================================
 }
 
 /* ===========================================================================

-   Reads a long in LSB order from the given gz_stream. Sets 
+   Reads a long in LSB order from the given gz_stream. Sets z_err in case
+   of error.

 */
 local uLong getLong (s)
     gz_stream *s;
 */
 local uLong getLong (s)
     gz_stream *s;


@@ -822,14 +943,14 @@ int ZEXPORT gzclose (file)
     if (s == NULL) return Z_STREAM_ERROR;
 
     if (s->mode == 'w') {
     if (s == NULL) return Z_STREAM_ERROR;
 
     if (s->mode == 'w') {

-#ifdef NO_DEFLATE
-       return Z_STREAM_ERROR;
+#ifdef NO_GZCOMPRESS
+        return Z_STREAM_ERROR;

 #else
         err = do_flush (file, Z_FINISH);
         if (err != Z_OK) return destroy((gz_stream*)file);
 
         putLong (s->file, s->crc);
 #else
         err = do_flush (file, Z_FINISH);
         if (err != Z_OK) return destroy((gz_stream*)file);
 
         putLong (s->file, s->crc);

-        putLong (s->file, s->stream.total_in);
+        putLong (s->file, (uLong)(s->in & 0xffffffff));

 #endif
     }
     return destroy((gz_stream*)file);
 #endif
     }
     return destroy((gz_stream*)file);


@@ -842,7 +963,7 @@ int ZEXPORT gzclose (file)
    errnum is set to Z_ERRNO and the application may consult errno
    to get the exact error code.
 */
    errnum is set to Z_ERRNO and the application may consult errno
    to get the exact error code.
 */

-const char*  ZEXPORT gzerror (file, errnum)
+const char * ZEXPORT gzerror (file, errnum)

     gzFile file;
     int *errnum;
 {
     gzFile file;
     int *errnum;
 {


@@ -856,14 +977,29 @@ const char*  ZEXPORT gzerror (file, errnum)
     *errnum = s->z_err;
     if (*errnum == Z_OK) return (const char*)"";
 
     *errnum = s->z_err;
     if (*errnum == Z_OK) return (const char*)"";
 

-    m =  (char*)(*errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg);
+    m = (char*)(*errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg);

 
     if (m == NULL || *m == '\0') m = (char*)ERR_MSG(s->z_err);
 
     TRYFREE(s->msg);
     s->msg = (char*)ALLOC(strlen(s->path) + strlen(m) + 3);
 
     if (m == NULL || *m == '\0') m = (char*)ERR_MSG(s->z_err);
 
     TRYFREE(s->msg);
     s->msg = (char*)ALLOC(strlen(s->path) + strlen(m) + 3);

+    if (s->msg == Z_NULL) return (const char*)ERR_MSG(Z_MEM_ERROR);

     strcpy(s->msg, s->path);
     strcat(s->msg, ": ");
     strcat(s->msg, m);
     return (const char*)s->msg;
 }
     strcpy(s->msg, s->path);
     strcat(s->msg, ": ");
     strcat(s->msg, m);
     return (const char*)s->msg;
 }

+
+/* ===========================================================================
+     Clear the error and end-of-file flags, and do the same for the real file.
+*/
+void ZEXPORT gzclearerr (file)
+    gzFile file;
+{
+    gz_stream *s = (gz_stream*)file;
+
+    if (s == NULL) return;
+    if (s->z_err != Z_STREAM_END) s->z_err = Z_OK;
+    s->z_eof = 0;
+    clearerr(s->file);
+}