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
|
/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "SkData.h"
#include "SkFlate.h"
#include "SkStream.h"
#ifndef SK_ZLIB_INCLUDE
bool SkFlate::HaveFlate() { return false; }
bool SkFlate::Deflate(SkStream*, SkWStream*) { return false; }
bool SkFlate::Inflate(SkStream*, SkWStream*) { return false; }
#else
// static
bool SkFlate::HaveFlate() {
return true;
}
namespace {
#include SK_ZLIB_INCLUDE
// static
const size_t kBufferSize = 1024;
bool doFlate(bool compress, SkStream* src, SkWStream* dst) {
uint8_t inputBuffer[kBufferSize];
uint8_t outputBuffer[kBufferSize];
z_stream flateData;
flateData.zalloc = NULL;
flateData.zfree = NULL;
flateData.next_in = NULL;
flateData.avail_in = 0;
flateData.next_out = outputBuffer;
flateData.avail_out = kBufferSize;
int rc;
if (compress)
rc = deflateInit(&flateData, Z_DEFAULT_COMPRESSION);
else
rc = inflateInit(&flateData);
if (rc != Z_OK)
return false;
uint8_t* input = (uint8_t*)src->getMemoryBase();
size_t inputLength = src->getLength();
if (input == NULL || inputLength == 0) {
input = NULL;
flateData.next_in = inputBuffer;
flateData.avail_in = 0;
} else {
flateData.next_in = input;
flateData.avail_in = inputLength;
}
rc = Z_OK;
while (true) {
if (flateData.avail_out < kBufferSize) {
if (!dst->write(outputBuffer, kBufferSize - flateData.avail_out)) {
rc = Z_BUF_ERROR;
break;
}
flateData.next_out = outputBuffer;
flateData.avail_out = kBufferSize;
}
if (rc != Z_OK)
break;
if (flateData.avail_in == 0) {
if (input != NULL)
break;
size_t read = src->read(&inputBuffer, kBufferSize);
if (read == 0)
break;
flateData.next_in = inputBuffer;
flateData.avail_in = read;
}
if (compress)
rc = deflate(&flateData, Z_NO_FLUSH);
else
rc = inflate(&flateData, Z_NO_FLUSH);
}
while (rc == Z_OK) {
if (compress)
rc = deflate(&flateData, Z_FINISH);
else
rc = inflate(&flateData, Z_FINISH);
if (flateData.avail_out < kBufferSize) {
if (!dst->write(outputBuffer, kBufferSize - flateData.avail_out))
return false;
flateData.next_out = outputBuffer;
flateData.avail_out = kBufferSize;
}
}
if (compress)
deflateEnd(&flateData);
else
inflateEnd(&flateData);
if (rc == Z_STREAM_END)
return true;
return false;
}
}
// static
bool SkFlate::Deflate(SkStream* src, SkWStream* dst) {
return doFlate(true, src, dst);
}
bool SkFlate::Deflate(const void* ptr, size_t len, SkWStream* dst) {
SkMemoryStream stream(ptr, len);
return doFlate(true, &stream, dst);
}
bool SkFlate::Deflate(const SkData* data, SkWStream* dst) {
if (data) {
SkMemoryStream stream(data->data(), data->size());
return doFlate(true, &stream, dst);
}
return false;
}
// static
bool SkFlate::Inflate(SkStream* src, SkWStream* dst) {
return doFlate(false, src, dst);
}
#endif
|
