1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
// SPDX-License-Identifier: Zlib
#ifndef DFLTCC_H
#define DFLTCC_H
#include "../zlib_deflate/defutil.h"
#include <asm/facility.h>
#include <asm/setup.h>
/*
* Tuning parameters.
*/
#define DFLTCC_LEVEL_MASK 0x2 /* DFLTCC compression for level 1 only */
#define DFLTCC_LEVEL_MASK_DEBUG 0x3fe /* DFLTCC compression for all levels */
#define DFLTCC_BLOCK_SIZE 1048576
#define DFLTCC_FIRST_FHT_BLOCK_SIZE 4096
#define DFLTCC_DHT_MIN_SAMPLE_SIZE 4096
#define DFLTCC_RIBM 0
#define DFLTCC_FACILITY 151
/*
* Parameter Block for Query Available Functions.
*/
struct dfltcc_qaf_param {
char fns[16];
char reserved1[8];
char fmts[2];
char reserved2[6];
};
static_assert(sizeof(struct dfltcc_qaf_param) == 32);
#define DFLTCC_FMT0 0
/*
* Parameter Block for Generate Dynamic-Huffman Table, Compress and Expand.
*/
struct dfltcc_param_v0 {
uint16_t pbvn; /* Parameter-Block-Version Number */
uint8_t mvn; /* Model-Version Number */
uint8_t ribm; /* Reserved for IBM use */
unsigned reserved32 : 31;
unsigned cf : 1; /* Continuation Flag */
uint8_t reserved64[8];
unsigned nt : 1; /* New Task */
unsigned reserved129 : 1;
unsigned cvt : 1; /* Check Value Type */
unsigned reserved131 : 1;
unsigned htt : 1; /* Huffman-Table Type */
unsigned bcf : 1; /* Block-Continuation Flag */
unsigned bcc : 1; /* Block Closing Control */
unsigned bhf : 1; /* Block Header Final */
unsigned reserved136 : 1;
unsigned reserved137 : 1;
unsigned dhtgc : 1; /* DHT Generation Control */
unsigned reserved139 : 5;
unsigned reserved144 : 5;
unsigned sbb : 3; /* Sub-Byte Boundary */
uint8_t oesc; /* Operation-Ending-Supplemental Code */
unsigned reserved160 : 12;
unsigned ifs : 4; /* Incomplete-Function Status */
uint16_t ifl; /* Incomplete-Function Length */
uint8_t reserved192[8];
uint8_t reserved256[8];
uint8_t reserved320[4];
uint16_t hl; /* History Length */
unsigned reserved368 : 1;
uint16_t ho : 15; /* History Offset */
uint32_t cv; /* Check Value */
unsigned eobs : 15; /* End-of-block Symbol */
unsigned reserved431: 1;
uint8_t eobl : 4; /* End-of-block Length */
unsigned reserved436 : 12;
unsigned reserved448 : 4;
uint16_t cdhtl : 12; /* Compressed-Dynamic-Huffman Table
Length */
uint8_t reserved464[6];
uint8_t cdht[288];
uint8_t reserved[32];
uint8_t csb[1152];
};
static_assert(sizeof(struct dfltcc_param_v0) == 1536);
#define CVT_CRC32 0
#define CVT_ADLER32 1
#define HTT_FIXED 0
#define HTT_DYNAMIC 1
/*
* Extension of inflate_state and deflate_state for DFLTCC.
*/
struct dfltcc_state {
struct dfltcc_param_v0 param; /* Parameter block */
struct dfltcc_qaf_param af; /* Available functions */
uLong level_mask; /* Levels on which to use DFLTCC */
uLong block_size; /* New block each X bytes */
uLong block_threshold; /* New block after total_in > X */
uLong dht_threshold; /* New block only if avail_in >= X */
char msg[64]; /* Buffer for strm->msg */
};
/* Resides right after inflate_state or deflate_state */
#define GET_DFLTCC_STATE(state) ((struct dfltcc_state *)((state) + 1))
/* External functions */
int dfltcc_can_deflate(z_streamp strm);
int dfltcc_deflate(z_streamp strm,
int flush,
block_state *result);
void dfltcc_reset(z_streamp strm, uInt size);
int dfltcc_can_inflate(z_streamp strm);
typedef enum {
DFLTCC_INFLATE_CONTINUE,
DFLTCC_INFLATE_BREAK,
DFLTCC_INFLATE_SOFTWARE,
} dfltcc_inflate_action;
dfltcc_inflate_action dfltcc_inflate(z_streamp strm,
int flush, int *ret);
static inline int is_dfltcc_enabled(void)
{
return (zlib_dfltcc_support != ZLIB_DFLTCC_DISABLED &&
test_facility(DFLTCC_FACILITY));
}
#define DEFLATE_RESET_HOOK(strm) \
dfltcc_reset((strm), sizeof(deflate_state))
#define DEFLATE_HOOK dfltcc_deflate
#define DEFLATE_NEED_CHECKSUM(strm) (!dfltcc_can_deflate((strm)))
#define DEFLATE_DFLTCC_ENABLED() is_dfltcc_enabled()
#define INFLATE_RESET_HOOK(strm) \
dfltcc_reset((strm), sizeof(struct inflate_state))
#define INFLATE_TYPEDO_HOOK(strm, flush) \
if (dfltcc_can_inflate((strm))) { \
dfltcc_inflate_action action; \
\
RESTORE(); \
action = dfltcc_inflate((strm), (flush), &ret); \
LOAD(); \
if (action == DFLTCC_INFLATE_CONTINUE) \
break; \
else if (action == DFLTCC_INFLATE_BREAK) \
goto inf_leave; \
}
#define INFLATE_NEED_CHECKSUM(strm) (!dfltcc_can_inflate((strm)))
#define INFLATE_NEED_UPDATEWINDOW(strm) (!dfltcc_can_inflate((strm)))
#endif /* DFLTCC_H */
|
