summaryrefslogtreecommitdiffstats
path: root/lib/zlib_inflate/inftrees.h
diff options
context:
space:
mode:
Diffstat (limited to 'lib/zlib_inflate/inftrees.h')
-rw-r--r--lib/zlib_inflate/inftrees.h99
1 files changed, 45 insertions, 54 deletions
diff --git a/lib/zlib_inflate/inftrees.h b/lib/zlib_inflate/inftrees.h
index e37705a..5f5219b 100644
--- a/lib/zlib_inflate/inftrees.h
+++ b/lib/zlib_inflate/inftrees.h
@@ -1,6 +1,6 @@
/* inftrees.h -- header to use inftrees.c
- * Copyright (C) 1995-1998 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
+ * Copyright (C) 1995-2005 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
@@ -8,57 +8,48 @@
subject to change. Applications should only use zlib.h.
*/
-/* Huffman code lookup table entry--this entry is four bytes for machines
- that have 16-bit pointers (e.g. PC's in the small or medium model). */
-
-#ifndef _INFTREES_H
-#define _INFTREES_H
-
-typedef struct inflate_huft_s inflate_huft;
-
-struct inflate_huft_s {
- union {
- struct {
- Byte Exop; /* number of extra bits or operation */
- Byte Bits; /* number of bits in this code or subcode */
- } what;
- uInt pad; /* pad structure to a power of 2 (4 bytes for */
- } word; /* 16-bit, 8 bytes for 32-bit int's) */
- uInt base; /* literal, length base, distance base,
- or table offset */
-};
+/* 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 huft structures (850 for length/literals
- and 154 for distances, the latter actually the result of an
- exhaustive search). The actual maximum is not known, but the
- value below is more than safe. */
-#define MANY 1440
-
-extern int zlib_inflate_trees_bits (
- uInt *, /* 19 code lengths */
- uInt *, /* bits tree desired/actual depth */
- inflate_huft **, /* bits tree result */
- inflate_huft *, /* space for trees */
- z_streamp); /* for messages */
-
-extern int zlib_inflate_trees_dynamic (
- uInt, /* number of literal/length codes */
- uInt, /* number of distance codes */
- uInt *, /* that many (total) code lengths */
- uInt *, /* literal desired/actual bit depth */
- uInt *, /* distance desired/actual bit depth */
- inflate_huft **, /* literal/length tree result */
- inflate_huft **, /* distance tree result */
- inflate_huft *, /* space for trees */
- z_streamp); /* for messages */
-
-extern int zlib_inflate_trees_fixed (
- uInt *, /* literal desired/actual bit depth */
- uInt *, /* distance desired/actual bit depth */
- inflate_huft **, /* literal/length tree result */
- inflate_huft **, /* distance tree result */
- inflate_huft *, /* space for trees */
- z_streamp); /* for memory allocation */
-
-#endif /* _INFTREES_H */
+ exhaustive search was 1444 code structures (852 for length/literals
+ and 592 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 2048
+#define MAXD 592
+
+/* Type of code to build for inftable() */
+typedef enum {
+ CODES,
+ LENS,
+ DISTS
+} codetype;
+
+extern int zlib_inflate_table (codetype type, unsigned short *lens,
+ unsigned codes, code **table,
+ unsigned *bits, unsigned short *work);
OpenPOWER on IntegriCloud