This patch is relative to gzip 1.2.4. It allows uncompressing files
larger than 4 gigabytes. Files already compressed without the patch
are correct; the patch is needed only for decompression.

Jean-loup Gailly
jloup@gzip.org

*** unzip.c~	Wed Jul  9 17:51:24 1997
--- unzip.c	Sun Jul 21 18:38:11 1996
***************
*** 35,40 ****
--- 34,40 ----
  #define LOCEXT 28               /* offset of extra field length */
  #define LOCHDR 30               /* size of local header, including sig */
  #define EXTHDR 16               /* size of extended local header, inc sig */
+ #define RAND_HEAD_LEN  12       /* length of encryption random header */
  
  
  /* Globals */
***************
*** 103,108 ****
--- 103,109 ----
      ulg orig_len = 0;       /* original uncompressed length */
      int n;
      uch buf[EXTHDR];        /* extended local header */
+     int err = OK;
  
      ifd = in;
      ofd = out;
***************
*** 136,144 ****
  	}
  	while (n--) {
  	    uch c = (uch)get_byte();
- #ifdef CRYPT
- 	    if (decrypt) zdecode(c);
- #endif
  	    put_ubyte(c);
  	}
  	flush_window();
--- 137,142 ----
***************
*** 172,181 ****
  
      /* Validate decompression */
      if (orig_crc != updcrc(outbuf, 0)) {
! 	error("invalid compressed data--crc error");
      }
!     if (orig_len != (ulg)bytes_out) {
! 	error("invalid compressed data--length error");
      }
  
      /* Check if there are more entries in a pkzip file */
--- 170,183 ----
  
      /* Validate decompression */
      if (orig_crc != updcrc(outbuf, 0)) {
! 	fprintf(stderr, "\n%s: %s: invalid compressed data--crc error\n",
! 		progname, ifname);
! 	err = ERROR;
      }
!     if (((orig_len - (ulg)bytes_out) & 0x0ffffffffL) != 0) {
! 	fprintf(stderr, "\n%s: %s: invalid compressed data--length error\n",
! 		progname, ifname);
! 	err = ERROR;
      }
  
      /* Check if there are more entries in a pkzip file */
***************
*** 189,199 ****
  	    fprintf(stderr,
  		    "%s: %s has more than one entry -- unchanged\n",
  		    progname, ifname);
! 	    exit_code = ERROR;
! 	    ext_header = pkzip = 0;
! 	    return ERROR;
  	}
      }
      ext_header = pkzip = 0; /* for next file */
!     return OK;
  }
--- 191,202 ----
  	    fprintf(stderr,
  		    "%s: %s has more than one entry -- unchanged\n",
  		    progname, ifname);
! 	    err = ERROR;
  	}
      }
      ext_header = pkzip = 0; /* for next file */
!     if (err == OK) return OK;
!     exit_code = ERROR;
!     if (!test) abort_gzip();
!     return err;
  }