/* inftrees.h -- header to use inftrees.c
|
/* inftrees.h -- header to use inftrees.c
|
* Copyright (C) 1995-2005 Mark Adler
|
* Copyright (C) 1995-2005 Mark Adler
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
*/
|
*/
|
|
|
/* WARNING: this file should *not* be used by applications. It is
|
/* WARNING: this file should *not* be used by applications. It is
|
part of the implementation of the compression library and is
|
part of the implementation of the compression library and is
|
subject to change. Applications should only use zlib.h.
|
subject to change. Applications should only use zlib.h.
|
*/
|
*/
|
|
|
/* Structure for decoding tables. Each entry provides either the
|
/* Structure for decoding tables. Each entry provides either the
|
information needed to do the operation requested by the code that
|
information needed to do the operation requested by the code that
|
indexed that table entry, or it provides a pointer to another
|
indexed that table entry, or it provides a pointer to another
|
table that indexes more bits of the code. op indicates whether
|
table that indexes more bits of the code. op indicates whether
|
the entry is a pointer to another table, a literal, a length or
|
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
|
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
|
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
|
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
|
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
|
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 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
|
of a literal, the base length or distance, or the offset from
|
the current table to the next table. Each entry is four bytes. */
|
the current table to the next table. Each entry is four bytes. */
|
typedef struct {
|
typedef struct {
|
unsigned char op; /* operation, extra bits, table bits */
|
unsigned char op; /* operation, extra bits, table bits */
|
unsigned char bits; /* bits in this part of the code */
|
unsigned char bits; /* bits in this part of the code */
|
unsigned short val; /* offset in table or code value */
|
unsigned short val; /* offset in table or code value */
|
} code;
|
} code;
|
|
|
/* op values as set by inflate_table():
|
/* op values as set by inflate_table():
|
00000000 - literal
|
00000000 - literal
|
0000tttt - table link, tttt != 0 is the number of table index bits
|
0000tttt - table link, tttt != 0 is the number of table index bits
|
0001eeee - length or distance, eeee is the number of extra bits
|
0001eeee - length or distance, eeee is the number of extra bits
|
01100000 - end of block
|
01100000 - end of block
|
01000000 - invalid code
|
01000000 - invalid code
|
*/
|
*/
|
|
|
/* Maximum size of dynamic tree. The maximum found in a long but non-
|
/* Maximum size of dynamic tree. The maximum found in a long but non-
|
exhaustive search was 1444 code structures (852 for length/literals
|
exhaustive search was 1444 code structures (852 for length/literals
|
and 592 for distances, the latter actually the result of an
|
and 592 for distances, the latter actually the result of an
|
exhaustive search). The true maximum is not known, but the value
|
exhaustive search). The true maximum is not known, but the value
|
below is more than safe. */
|
below is more than safe. */
|
#define ENOUGH 2048
|
#define ENOUGH 2048
|
#define MAXD 592
|
#define MAXD 592
|
|
|
/* Type of code to build for inftable() */
|
/* Type of code to build for inftable() */
|
typedef enum {
|
typedef enum {
|
CODES,
|
CODES,
|
LENS,
|
LENS,
|
DISTS
|
DISTS
|
} codetype;
|
} codetype;
|
|
|
extern int inflate_table OF((codetype type, unsigned short FAR *lens,
|
extern int inflate_table OF((codetype type, unsigned short FAR *lens,
|
unsigned codes, code FAR * FAR *table,
|
unsigned codes, code FAR * FAR *table,
|
unsigned FAR *bits, unsigned short FAR *work));
|
unsigned FAR *bits, unsigned short FAR *work));
|
|
|
