summaryrefslogtreecommitdiff
path: root/lib/zlib/inftrees.h
diff options
context:
space:
mode:
authorMike Frysinger <vapier@gentoo.org>2011-04-08 12:23:30 +0000
committerWolfgang Denk <wd@denx.de>2011-04-30 20:21:45 +0200
commite89516f031dbf711b71e6ee4d131cdc8b9946fb0 (patch)
treecb36d506165e971849cc1237565798fcc236af0b /lib/zlib/inftrees.h
parent56c1769806a437c994355422f5b52ca3eee70834 (diff)
downloadu-boot-imx-e89516f031dbf711b71e6ee4d131cdc8b9946fb0.zip
u-boot-imx-e89516f031dbf711b71e6ee4d131cdc8b9946fb0.tar.gz
u-boot-imx-e89516f031dbf711b71e6ee4d131cdc8b9946fb0.tar.bz2
zlib: split up to match original source tree
While looking to upgrade to zlib-1.2.5, the current mondo merge of multiple files into a single was making things way more difficult than it should have been. Hard to pick out what has been changed to port it to U-Boot, been removed as useless, and bug fixes added after the fact. So split the single file up into the original file names, and merge non-essential changes back from the original tree (for some reason, style in code in a bunch of places was changed to U-Boot style even though this isn't "U-Boot" code). The original build style is retained -- we have a single zlib.c that includes all the other files, and that is the only file we compile. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'lib/zlib/inftrees.h')
-rw-r--r--lib/zlib/inftrees.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/lib/zlib/inftrees.h b/lib/zlib/inftrees.h
new file mode 100644
index 0000000..b1104c8
--- /dev/null
+++ b/lib/zlib/inftrees.h
@@ -0,0 +1,55 @@
+/* inftrees.h -- header to use inftrees.c
+ * 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
+ 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 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 inflate_table OF((codetype type, unsigned short FAR *lens,
+ unsigned codes, code FAR * FAR *table,
+ unsigned FAR *bits, unsigned short FAR *work));