document mingw linker fix and close associated bug

[debian/gzip] / trees.c

diff --git a/trees.c b/trees.c
index 43ee76a63e3cc8612abd351bc3a80f308acf8207..473edd4f2452478b3375291748b1b14dced5f027 100644 (file)
--- a/trees.c
+++ b/trees.c
@@ -1,8 +1,21 @@
 /* trees.c -- output deflated data using Huffman coding
- * Copyright (C) 1992-1993 Jean-loup Gailly
- * This is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License, see the file COPYING.
- */
+
+   Copyright (C) 1997-1999, 2009-2018 Free Software Foundation, Inc.
+   Copyright (C) 1992-1993 Jean-loup Gailly
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
 /*
  *  PURPOSE
@@ -46,13 +59,12 @@
  *      void ct_tally (int dist, int lc);
  *          Save the match info and tally the frequency counts.
  *
- *      off_t flush_block (char *buf, ulg stored_len, int pad, int eof)
+ *      off_t flush_block (char *buf, ulg stored_len, int eof)
  *          Determine the best encoding for the current block: dynamic trees,
  *          static trees or store, and output the encoded block to the zip
- *          file. If pad is set, pads the block to the next
- *          byte. Returns the total compressed length for the file so
- *          far.
- * */
+ *          file. Returns the total compressed length for the file so far.
+ *
+ */
 
 #include <config.h>
 #include <ctype.h>
@@ -60,10 +72,6 @@
 #include "tailor.h"
 #include "gzip.h"
 
-#ifdef RCSID
-static char rcsid[] = "$Id: trees.c,v 0.12 1993/06/10 13:27:54 jloup Exp $";
-#endif
-
 /* ===========================================================================
  * Constants
  */
@@ -278,8 +286,8 @@ local off_t compressed_len; /* total bit length of compressed file */
 local off_t input_len;      /* total byte length of input file */
 /* input_len is for debugging only since we can get it by other means. */
 
-ush *file_type;        /* pointer to UNKNOWN, BINARY or ASCII */
-int *file_method;      /* pointer to DEFLATE or STORE */
+static ush *file_type;        /* pointer to UNKNOWN, BINARY or ASCII */
+static int *file_method;      /* pointer to DEFLATE or STORE */
 
 #ifdef DEBUG
 extern off_t bits_sent;  /* bit length of the compressed data */
@@ -292,17 +300,17 @@ extern unsigned near strstart; /* window offset of current string */
  * Local (static) routines in this file.
  */
 
-local void init_block     OF((void));
-local void pqdownheap     OF((ct_data near *tree, int k));
-local void gen_bitlen     OF((tree_desc near *desc));
-local void gen_codes      OF((ct_data near *tree, int max_code));
-local void build_tree     OF((tree_desc near *desc));
-local void scan_tree      OF((ct_data near *tree, int max_code));
-local void send_tree      OF((ct_data near *tree, int max_code));
-local int  build_bl_tree  OF((void));
-local void send_all_trees OF((int lcodes, int dcodes, int blcodes));
-local void compress_block OF((ct_data near *ltree, ct_data near *dtree));
-local void set_file_type  OF((void));
+local void init_block     (void);
+local void pqdownheap     (ct_data near *tree, int k);
+local void gen_bitlen     (tree_desc near *desc);
+local void gen_codes      (ct_data near *tree, int max_code);
+local void build_tree     (tree_desc near *desc);
+local void scan_tree      (ct_data near *tree, int max_code);
+local void send_tree      (ct_data near *tree, int max_code);
+local int  build_bl_tree  (void);
+local void send_all_trees (int lcodes, int dcodes, int blcodes);
+local void compress_block (ct_data near *ltree, ct_data near *dtree);
+local void set_file_type  (void);
 
 
 #ifndef DEBUG
@@ -343,7 +351,7 @@ void ct_init(attr, methodp)
     file_type = attr;
     file_method = methodp;
     compressed_len = input_len = 0L;
-        
+
     if (static_dtree[0].Len != 0) return; /* ct_init already called */
 
     /* Initialize the mapping length (0..255) -> length code (0..28) */
@@ -889,7 +897,7 @@ off_t flush_block(buf, stored_len, pad, eof)
     if (static_lenb <= opt_lenb) opt_lenb = static_lenb;
 
     /* If compression failed and this is the first and last block,
-     * and if the zip file can be seeked (to rewrite the local header),
+     * and if we can seek through the zip file (to rewrite the local header),
      * the whole file is transformed into a stored file:
      */
 #ifdef FORCE_METHOD
@@ -898,7 +906,8 @@ off_t flush_block(buf, stored_len, pad, eof)
     if (stored_len <= opt_lenb && eof && compressed_len == 0L && seekable()) {
 #endif
         /* Since LIT_BUFSIZE <= 2*WSIZE, the input data must be there: */
-        if (buf == (char*)0) error ("block vanished");
+        if (!buf)
+          gzip_error ("block vanished");
 
         copy_block(buf, (unsigned)stored_len, 0); /* without header */
         compressed_len = stored_len << 3;