bowen liu / Mbed OS mbed-os-example-blinky

ex

Fork of mbed-os-example-mbed5-blinky by mbed-os-examples

DuerOS-Light-SDK-v1.1.0/duer-os-light/src/iot-baidu-ota/baidu_ota_unpack/zliblite/inftrees.h@47:9e361da97763, 2017-07-18 (annotated)

Committer:
TMBOY
Date:
Tue Jul 18 16:54:45 2017 +0800
Revision:
47:9e361da97763
?

Who changed what in which revision?

UserRevisionLine numberNew contents of line
TMBOY 47:9e361da97763 1 /* inftrees.h -- header to use inftrees.c
TMBOY 47:9e361da97763 2 * Copyright (C) 1995-2005, 2010 Mark Adler
TMBOY 47:9e361da97763 3 * For conditions of distribution and use, see copyright notice in zlib.h
TMBOY 47:9e361da97763 4 */
TMBOY 47:9e361da97763 5
TMBOY 47:9e361da97763 6 /* WARNING: this file should *not* be used by applications. It is
TMBOY 47:9e361da97763 7 part of the implementation of the compression library and is
TMBOY 47:9e361da97763 8 subject to change. Applications should only use zlib.h.
TMBOY 47:9e361da97763 9 */
TMBOY 47:9e361da97763 10
TMBOY 47:9e361da97763 11 /* Structure for decoding tables. Each entry provides either the
TMBOY 47:9e361da97763 12 information needed to do the operation requested by the code that
TMBOY 47:9e361da97763 13 indexed that table entry, or it provides a pointer to another
TMBOY 47:9e361da97763 14 table that indexes more bits of the code. op indicates whether
TMBOY 47:9e361da97763 15 the entry is a pointer to another table, a literal, a length or
TMBOY 47:9e361da97763 16 distance, an end-of-block, or an invalid code. For a table
TMBOY 47:9e361da97763 17 pointer, the low four bits of op is the number of index bits of
TMBOY 47:9e361da97763 18 that table. For a length or distance, the low four bits of op
TMBOY 47:9e361da97763 19 is the number of extra bits to get after the code. bits is
TMBOY 47:9e361da97763 20 the number of bits in this code or part of the code to drop off
TMBOY 47:9e361da97763 21 of the bit buffer. val is the actual byte to output in the case
TMBOY 47:9e361da97763 22 of a literal, the base length or distance, or the offset from
TMBOY 47:9e361da97763 23 the current table to the next table. Each entry is four bytes. */
TMBOY 47:9e361da97763 24 typedef struct {
TMBOY 47:9e361da97763 25 unsigned char op; /* operation, extra bits, table bits */
TMBOY 47:9e361da97763 26 unsigned char bits; /* bits in this part of the code */
TMBOY 47:9e361da97763 27 unsigned short val; /* offset in table or code value */
TMBOY 47:9e361da97763 28 } code;
TMBOY 47:9e361da97763 29
TMBOY 47:9e361da97763 30 /* op values as set by inflate_table():
TMBOY 47:9e361da97763 31 00000000 - literal
TMBOY 47:9e361da97763 32 0000tttt - table link, tttt != 0 is the number of table index bits
TMBOY 47:9e361da97763 33 0001eeee - length or distance, eeee is the number of extra bits
TMBOY 47:9e361da97763 34 01100000 - end of block
TMBOY 47:9e361da97763 35 01000000 - invalid code
TMBOY 47:9e361da97763 36 */
TMBOY 47:9e361da97763 37
TMBOY 47:9e361da97763 38 /* Maximum size of the dynamic table. The maximum number of code structures is
TMBOY 47:9e361da97763 39 1444, which is the sum of 852 for literal/length codes and 592 for distance
TMBOY 47:9e361da97763 40 codes. These values were found by exhaustive searches using the program
TMBOY 47:9e361da97763 41 examples/enough.c found in the zlib distribtution. The arguments to that
TMBOY 47:9e361da97763 42 program are the number of symbols, the initial root table size, and the
TMBOY 47:9e361da97763 43 maximum bit length of a code. "enough 286 9 15" for literal/length codes
TMBOY 47:9e361da97763 44 returns returns 852, and "enough 30 6 15" for distance codes returns 592.
TMBOY 47:9e361da97763 45 The initial root table size (9 or 6) is found in the fifth argument of the
TMBOY 47:9e361da97763 46 inflate_table() calls in inflate.c and infback.c. If the root table size is
TMBOY 47:9e361da97763 47 changed, then these maximum sizes would be need to be recalculated and
TMBOY 47:9e361da97763 48 updated. */
TMBOY 47:9e361da97763 49 #define ENOUGH_LENS 852
TMBOY 47:9e361da97763 50 #define ENOUGH_DISTS 592
TMBOY 47:9e361da97763 51 #define ENOUGH (ENOUGH_LENS+ENOUGH_DISTS)
TMBOY 47:9e361da97763 52
TMBOY 47:9e361da97763 53 /* Type of code to build for inflate_table() */
TMBOY 47:9e361da97763 54 typedef enum {
TMBOY 47:9e361da97763 55 CODES,
TMBOY 47:9e361da97763 56 LENS,
TMBOY 47:9e361da97763 57 DISTS
TMBOY 47:9e361da97763 58 } codetype;
TMBOY 47:9e361da97763 59
TMBOY 47:9e361da97763 60 int ZLIB_INTERNAL inflate_table OF((codetype type, unsigned short FAR *lens,
TMBOY 47:9e361da97763 61 unsigned codes, code FAR * FAR *table,
TMBOY 47:9e361da97763 62 unsigned FAR *bits, unsigned short FAR *work));