Minor header cleaning.

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

diff --git a/src/zlib/gzio.c b/src/zlib/gzio.c
index e29198ac7afaf76999c0c6e00908005cb12a4d68..7e90f4928fc0b67a4a4a5c76ab289394c41c7e55 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) 1995-2005 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 compatibility 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;
 }
 


@@ -195,7 +220,7 @@ gzFile ZEXPORT gzdopen (fd, mode)
     int fd;
     const char *mode;
 {
     int fd;
     const char *mode;
 {

-    char name[20];
+    char name[46];      /* allow for up to 128-bit integers */

 
     if (fd < 0) return (gzFile)Z_NULL;
     sprintf(name, "<fd:%d>", fd); /* for debugging */
 
     if (fd < 0) return (gzFile)Z_NULL;
     sprintf(name, "<fd:%d>", fd); /* for debugging */


@@ -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 = (uInt)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 = (uInt)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;
 


@@ -370,70 +409,89 @@ 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++;
+        start++;
+        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 -=
+                    (uInt)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;
         if (s->stream.avail_in == 0 && !s->z_eof) {
 
             errno = 0;

-            s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
+            s->stream.avail_in = (uInt)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 = 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));
 

+    if (len == s->stream.avail_out &&
+        (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO))
+        return -1;

     return (int)(len - s->stream.avail_out);
 }
 
     return (int)(len - s->stream.avail_out);
 }
 


@@ -451,6 +509,25 @@ 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 +551,14 @@ 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 +579,11 @@ 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 +591,7 @@ 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 +606,67 @@ 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 +726,18 @@ 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 +754,7 @@ 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 +772,105 @@ 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 +892,26 @@ 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;
+}
+
+/* ===========================================================================
+     Returns 1 if reading and doing so transparently, otherwise zero.
+*/
+int ZEXPORT gzdirect (file)
+    gzFile file;
+{
+    gz_stream *s = (gz_stream*)file;
+
+    if (s == NULL || s->mode != 'r') return 0;
+    return s->transparent;

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


@@ -793,7 +929,8 @@ 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;


@@ -816,33 +953,38 @@ local uLong getLong (s)
 int ZEXPORT gzclose (file)
     gzFile file;
 {
 int ZEXPORT gzclose (file)
     gzFile file;
 {

-    int err;

     gz_stream *s = (gz_stream*)file;
 
     if (s == NULL) return Z_STREAM_ERROR;
 
     if (s->mode == 'w') {
     gz_stream *s = (gz_stream*)file;
 
     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
 #else

-        err = do_flush (file, Z_FINISH);
-        if (err != Z_OK) return destroy((gz_stream*)file);
+        if (do_flush (file, Z_FINISH) != Z_OK)
+            return destroy((gz_stream*)file);

 
         putLong (s->file, s->crc);
 
         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);
 }
 

+#ifdef STDC
+#  define zstrerror(errnum) strerror(errnum)
+#else
+#  define zstrerror(errnum) ""
+#endif
+

 /* ===========================================================================
 /* ===========================================================================

-     Returns the error message for the last error which occured on the
+     Returns the error message for the last error which occurred on the

    given compressed file. errnum is set to zlib error number. If an
    given compressed file. errnum is set to zlib error number. If an

-   error occured in the file system and not in the compression library,
+   error occurred in the file system and not in the compression library,

    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 +998,29 @@ 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);
+}