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authorKarl Berry <karl@freefriends.org>2006-01-17 21:16:42 +0000
committerKarl Berry <karl@freefriends.org>2006-01-17 21:16:42 +0000
commita3d3111bfe26b8e5f5bc6049dfb2a4ca2edc7881 (patch)
treef4a8a34f904c1bb86adcc3ae0e14434badc6dbe4 /Build/source/utils/gzip/lzw.h
parent6c0eafbb1395d426a72a74538e0b2a95e8344ca6 (diff)
utils 1
git-svn-id: svn://tug.org/texlive/trunk@1484 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/utils/gzip/lzw.h')
-rw-r--r--Build/source/utils/gzip/lzw.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/Build/source/utils/gzip/lzw.h b/Build/source/utils/gzip/lzw.h
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+/* lzw.h -- define the lzw functions.
+ * 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.
+ */
+
+#if !defined(OF) && defined(lint)
+# include "gzip.h"
+#endif
+
+#ifndef BITS
+# define BITS 16
+#endif
+#define INIT_BITS 9 /* Initial number of bits per code */
+
+#define LZW_MAGIC "\037\235" /* Magic header for lzw files, 1F 9D */
+
+#define BIT_MASK 0x1f /* Mask for 'number of compression bits' */
+/* Mask 0x20 is reserved to mean a fourth header byte, and 0x40 is free.
+ * It's a pity that old uncompress does not check bit 0x20. That makes
+ * extension of the format actually undesirable because old compress
+ * would just crash on the new format instead of giving a meaningful
+ * error message. It does check the number of bits, but it's more
+ * helpful to say "unsupported format, get a new version" than
+ * "can only handle 16 bits".
+ */
+
+#define BLOCK_MODE 0x80
+/* Block compression: if table is full and compression rate is dropping,
+ * clear the dictionary.
+ */
+
+#define LZW_RESERVED 0x60 /* reserved bits */
+
+#define CLEAR 256 /* flush the dictionary */
+#define FIRST (CLEAR+1) /* first free entry */
+
+extern int maxbits; /* max bits per code for LZW */
+extern int block_mode; /* block compress mode -C compatible with 2.0 */
+
+extern int lzw OF((int in, int out));
+extern int unlzw OF((int in, int out));