path: root/cpukit/zlib/inftrees.h
diff options
authorRalf Corsepius <>2005-10-28 07:22:42 +0000
committerRalf Corsepius <>2005-10-28 07:22:42 +0000
commit959f7df23aaf172105d41c7d5d7993ad7da66395 (patch)
treec373d46aa90c01bc6e002a8b1afe781e4f97b8e1 /cpukit/zlib/inftrees.h
parentImport from zlib-1.2.4 (diff)
Import of zlib-
Diffstat (limited to 'cpukit/zlib/inftrees.h')
1 files changed, 55 insertions, 0 deletions
diff --git a/cpukit/zlib/inftrees.h b/cpukit/zlib/inftrees.h
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+/* inftrees.h -- header to use inftrees.c
+ * Copyright (C) 1995-2003 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+/* WARNING: this file should *not* be used by applications. It is
+ part of the implementation of the compression library and is
+ subject to change. Applications should only use zlib.h.
+ */
+/* Structure for decoding tables. Each entry provides either the
+ information needed to do the operation requested by the code that
+ indexed that table entry, or it provides a pointer to another
+ table that indexes more bits of the code. op indicates whether
+ the entry is a pointer to another table, a literal, a length or
+ distance, an end-of-block, or an invalid code. For a table
+ pointer, the low four bits of op is the number of index bits of
+ that table. For a length or distance, the low four bits of op
+ is the number of extra bits to get after the code. bits is
+ the number of bits in this code or part of the code to drop off
+ of the bit buffer. val is the actual byte to output in the case
+ of a literal, the base length or distance, or the offset from
+ the current table to the next table. Each entry is four bytes. */
+typedef struct {
+ unsigned char op; /* operation, extra bits, table bits */
+ unsigned char bits; /* bits in this part of the code */
+ unsigned short val; /* offset in table or code value */
+} code;
+/* op values as set by inflate_table():
+ 00000000 - literal
+ 0000tttt - table link, tttt != 0 is the number of table index bits
+ 0001eeee - length or distance, eeee is the number of extra bits
+ 01100000 - end of block
+ 01000000 - invalid code
+ */
+/* Maximum size of dynamic tree. The maximum found in a long but non-
+ exhaustive search was 1004 code structures (850 for length/literals
+ and 154 for distances, the latter actually the result of an
+ exhaustive search). The true maximum is not known, but the value
+ below is more than safe. */
+#define ENOUGH 1440
+#define MAXD 154
+/* Type of code to build for inftable() */
+typedef enum {
+} codetype;
+extern int inflate_table OF((codetype type, unsigned short FAR *lens,
+ unsigned codes, code FAR * FAR *table,
+ unsigned FAR *bits, unsigned short FAR *work));