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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
|
//go:build !appengine && !noasm && gc
// +build !appengine,!noasm,gc
package s2
import (
"sync"
"github.com/klauspost/compress/internal/race"
)
const hasAmd64Asm = true
var encPools [4]sync.Pool
// encodeBlock encodes a non-empty src to a guaranteed-large-enough dst. It
// assumes that the varint-encoded length of the decompressed bytes has already
// been written.
//
// It also assumes that:
//
// len(dst) >= MaxEncodedLen(len(src)) &&
// minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize
func encodeBlock(dst, src []byte) (d int) {
race.ReadSlice(src)
race.WriteSlice(dst)
const (
// Use 12 bit table when less than...
limit12B = 16 << 10
// Use 10 bit table when less than...
limit10B = 4 << 10
// Use 8 bit table when less than...
limit8B = 512
)
if len(src) >= 4<<20 {
const sz, pool = 65536, 0
tmp, ok := encPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encPools[pool].Put(tmp)
return encodeBlockAsm(dst, src, tmp)
}
if len(src) >= limit12B {
const sz, pool = 65536, 0
tmp, ok := encPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encPools[pool].Put(tmp)
return encodeBlockAsm4MB(dst, src, tmp)
}
if len(src) >= limit10B {
const sz, pool = 16384, 1
tmp, ok := encPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encPools[pool].Put(tmp)
return encodeBlockAsm12B(dst, src, tmp)
}
if len(src) >= limit8B {
const sz, pool = 4096, 2
tmp, ok := encPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encPools[pool].Put(tmp)
return encodeBlockAsm10B(dst, src, tmp)
}
if len(src) < minNonLiteralBlockSize {
return 0
}
const sz, pool = 1024, 3
tmp, ok := encPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encPools[pool].Put(tmp)
return encodeBlockAsm8B(dst, src, tmp)
}
var encBetterPools [5]sync.Pool
// encodeBlockBetter encodes a non-empty src to a guaranteed-large-enough dst. It
// assumes that the varint-encoded length of the decompressed bytes has already
// been written.
//
// It also assumes that:
//
// len(dst) >= MaxEncodedLen(len(src)) &&
// minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize
func encodeBlockBetter(dst, src []byte) (d int) {
race.ReadSlice(src)
race.WriteSlice(dst)
const (
// Use 12 bit table when less than...
limit12B = 16 << 10
// Use 10 bit table when less than...
limit10B = 4 << 10
// Use 8 bit table when less than...
limit8B = 512
)
if len(src) > 4<<20 {
const sz, pool = 589824, 0
tmp, ok := encBetterPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encBetterPools[pool].Put(tmp)
return encodeBetterBlockAsm(dst, src, tmp)
}
if len(src) >= limit12B {
const sz, pool = 589824, 0
tmp, ok := encBetterPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encBetterPools[pool].Put(tmp)
return encodeBetterBlockAsm4MB(dst, src, tmp)
}
if len(src) >= limit10B {
const sz, pool = 81920, 0
tmp, ok := encBetterPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encBetterPools[pool].Put(tmp)
return encodeBetterBlockAsm12B(dst, src, tmp)
}
if len(src) >= limit8B {
const sz, pool = 20480, 1
tmp, ok := encBetterPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encBetterPools[pool].Put(tmp)
return encodeBetterBlockAsm10B(dst, src, tmp)
}
if len(src) < minNonLiteralBlockSize {
return 0
}
const sz, pool = 5120, 2
tmp, ok := encBetterPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encBetterPools[pool].Put(tmp)
return encodeBetterBlockAsm8B(dst, src, tmp)
}
// encodeBlockSnappy encodes a non-empty src to a guaranteed-large-enough dst. It
// assumes that the varint-encoded length of the decompressed bytes has already
// been written.
//
// It also assumes that:
//
// len(dst) >= MaxEncodedLen(len(src)) &&
// minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize
func encodeBlockSnappy(dst, src []byte) (d int) {
race.ReadSlice(src)
race.WriteSlice(dst)
const (
// Use 12 bit table when less than...
limit12B = 16 << 10
// Use 10 bit table when less than...
limit10B = 4 << 10
// Use 8 bit table when less than...
limit8B = 512
)
if len(src) > 65536 {
const sz, pool = 65536, 0
tmp, ok := encPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encPools[pool].Put(tmp)
return encodeSnappyBlockAsm(dst, src, tmp)
}
if len(src) >= limit12B {
const sz, pool = 65536, 0
tmp, ok := encPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encPools[pool].Put(tmp)
return encodeSnappyBlockAsm64K(dst, src, tmp)
}
if len(src) >= limit10B {
const sz, pool = 16384, 1
tmp, ok := encPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encPools[pool].Put(tmp)
return encodeSnappyBlockAsm12B(dst, src, tmp)
}
if len(src) >= limit8B {
const sz, pool = 4096, 2
tmp, ok := encPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encPools[pool].Put(tmp)
return encodeSnappyBlockAsm10B(dst, src, tmp)
}
if len(src) < minNonLiteralBlockSize {
return 0
}
const sz, pool = 1024, 3
tmp, ok := encPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encPools[pool].Put(tmp)
return encodeSnappyBlockAsm8B(dst, src, tmp)
}
// encodeBlockSnappy encodes a non-empty src to a guaranteed-large-enough dst. It
// assumes that the varint-encoded length of the decompressed bytes has already
// been written.
//
// It also assumes that:
//
// len(dst) >= MaxEncodedLen(len(src)) &&
// minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize
func encodeBlockBetterSnappy(dst, src []byte) (d int) {
race.ReadSlice(src)
race.WriteSlice(dst)
const (
// Use 12 bit table when less than...
limit12B = 16 << 10
// Use 10 bit table when less than...
limit10B = 4 << 10
// Use 8 bit table when less than...
limit8B = 512
)
if len(src) > 65536 {
const sz, pool = 589824, 0
tmp, ok := encBetterPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encBetterPools[pool].Put(tmp)
return encodeSnappyBetterBlockAsm(dst, src, tmp)
}
if len(src) >= limit12B {
const sz, pool = 294912, 4
tmp, ok := encBetterPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encBetterPools[pool].Put(tmp)
return encodeSnappyBetterBlockAsm64K(dst, src, tmp)
}
if len(src) >= limit10B {
const sz, pool = 81920, 0
tmp, ok := encBetterPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encBetterPools[pool].Put(tmp)
return encodeSnappyBetterBlockAsm12B(dst, src, tmp)
}
if len(src) >= limit8B {
const sz, pool = 20480, 1
tmp, ok := encBetterPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encBetterPools[pool].Put(tmp)
return encodeSnappyBetterBlockAsm10B(dst, src, tmp)
}
if len(src) < minNonLiteralBlockSize {
return 0
}
const sz, pool = 5120, 2
tmp, ok := encBetterPools[pool].Get().(*[sz]byte)
if !ok {
tmp = &[sz]byte{}
}
race.WriteSlice(tmp[:])
defer encBetterPools[pool].Put(tmp)
return encodeSnappyBetterBlockAsm8B(dst, src, tmp)
}
|
