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
|
/*************************************************
* Zlib Compressor Source File *
* (C) 1999-2007 The Botan Project *
*************************************************/
#include <botan/zlib.h>
#include <cstring>
#include <map>
#include <zlib.h>
namespace Botan {
namespace {
/*************************************************
* Allocation Information for Zlib *
*************************************************/
class Zlib_Alloc_Info
{
public:
std::map<void*, u32bit> current_allocs;
Allocator* alloc;
Zlib_Alloc_Info() { alloc = Allocator::get(false); }
};
/*************************************************
* Allocation Function for Zlib *
*************************************************/
void* zlib_malloc(void* info_ptr, unsigned int n, unsigned int size)
{
Zlib_Alloc_Info* info = static_cast<Zlib_Alloc_Info*>(info_ptr);
void* ptr = info->alloc->allocate(n * size);
info->current_allocs[ptr] = n * size;
return ptr;
}
/*************************************************
* Allocation Function for Zlib *
*************************************************/
void zlib_free(void* info_ptr, void* ptr)
{
Zlib_Alloc_Info* info = static_cast<Zlib_Alloc_Info*>(info_ptr);
std::map<void*, u32bit>::const_iterator i = info->current_allocs.find(ptr);
if(i == info->current_allocs.end())
throw Invalid_Argument("zlib_free: Got pointer not allocated by us");
info->alloc->deallocate(ptr, i->second);
}
}
/*************************************************
* Wrapper Type for Zlib z_stream *
*************************************************/
class Zlib_Stream
{
public:
z_stream stream;
Zlib_Stream()
{
std::memset(&stream, 0, sizeof(z_stream));
stream.zalloc = zlib_malloc;
stream.zfree = zlib_free;
stream.opaque = new Zlib_Alloc_Info;
}
~Zlib_Stream()
{
Zlib_Alloc_Info* info = static_cast<Zlib_Alloc_Info*>(stream.opaque);
delete info;
std::memset(&stream, 0, sizeof(z_stream));
}
};
/*************************************************
* Zlib_Compression Constructor *
*************************************************/
Zlib_Compression::Zlib_Compression(u32bit l) :
level((l >= 9) ? 9 : l), buffer(DEFAULT_BUFFERSIZE)
{
zlib = 0;
}
/*************************************************
* Start Compressing with Zlib *
*************************************************/
void Zlib_Compression::start_msg()
{
clear();
zlib = new Zlib_Stream;
if(deflateInit(&(zlib->stream), level) != Z_OK)
throw Exception("Zlib_Compression: Memory allocation error");
}
/*************************************************
* Compress Input with Zlib *
*************************************************/
void Zlib_Compression::write(const byte input[], u32bit length)
{
zlib->stream.next_in = (Bytef*)input;
zlib->stream.avail_in = length;
while(zlib->stream.avail_in != 0)
{
zlib->stream.next_out = (Bytef*)buffer.begin();
zlib->stream.avail_out = buffer.size();
deflate(&(zlib->stream), Z_NO_FLUSH);
send(buffer.begin(), buffer.size() - zlib->stream.avail_out);
}
}
/*************************************************
* Finish Compressing with Zlib *
*************************************************/
void Zlib_Compression::end_msg()
{
zlib->stream.next_in = 0;
zlib->stream.avail_in = 0;
int rc = Z_OK;
while(rc != Z_STREAM_END)
{
zlib->stream.next_out = (Bytef*)buffer.begin();
zlib->stream.avail_out = buffer.size();
rc = deflate(&(zlib->stream), Z_FINISH);
send(buffer.begin(), buffer.size() - zlib->stream.avail_out);
}
clear();
}
/*************************************************
* Flush the Zlib Compressor *
*************************************************/
void Zlib_Compression::flush()
{
zlib->stream.next_in = 0;
zlib->stream.avail_in = 0;
while(true)
{
zlib->stream.next_out = (Bytef*)buffer.begin();
zlib->stream.avail_out = buffer.size();
deflate(&(zlib->stream), Z_FULL_FLUSH);
send(buffer.begin(), buffer.size() - zlib->stream.avail_out);
if(zlib->stream.avail_out == buffer.size()) break;
}
}
/*************************************************
* Clean up Compression Context *
*************************************************/
void Zlib_Compression::clear()
{
if(zlib)
{
deflateEnd(&(zlib->stream));
delete zlib;
zlib = 0;
}
buffer.clear();
}
/*************************************************
* Zlib_Decompression Constructor *
*************************************************/
Zlib_Decompression::Zlib_Decompression() : buffer(DEFAULT_BUFFERSIZE)
{
zlib = 0;
no_writes = true;
}
/*************************************************
* Start Decompressing with Zlib *
*************************************************/
void Zlib_Decompression::start_msg()
{
clear();
zlib = new Zlib_Stream;
if(inflateInit(&(zlib->stream)) != Z_OK)
throw Exception("Zlib_Decompression: Memory allocation error");
}
/*************************************************
* Decompress Input with Zlib *
*************************************************/
void Zlib_Decompression::write(const byte input[], u32bit length)
{
if(length) no_writes = false;
zlib->stream.next_in = (Bytef*)input;
zlib->stream.avail_in = length;
while(zlib->stream.avail_in != 0)
{
zlib->stream.next_out = (Bytef*)buffer.begin();
zlib->stream.avail_out = buffer.size();
int rc = inflate(&(zlib->stream), Z_SYNC_FLUSH);
if(rc != Z_OK && rc != Z_STREAM_END)
{
clear();
if(rc == Z_DATA_ERROR)
throw Decoding_Error("Zlib_Decompression: Data integrity error");
if(rc == Z_NEED_DICT)
throw Decoding_Error("Zlib_Decompression: Need preset dictionary");
if(rc == Z_MEM_ERROR)
throw Exception("Zlib_Decompression: Memory allocation error");
throw Exception("Zlib_Decompression: Unknown decompress error");
}
send(buffer.begin(), buffer.size() - zlib->stream.avail_out);
if(rc == Z_STREAM_END)
{
u32bit read_from_block = length - zlib->stream.avail_in;
start_msg();
zlib->stream.next_in = (Bytef*)input + read_from_block;
zlib->stream.avail_in = length - read_from_block;
input += read_from_block;
length -= read_from_block;
}
}
}
/*************************************************
* Finish Decompressing with Zlib *
*************************************************/
void Zlib_Decompression::end_msg()
{
if(no_writes) return;
zlib->stream.next_in = 0;
zlib->stream.avail_in = 0;
int rc = Z_OK;
while(rc != Z_STREAM_END)
{
zlib->stream.next_out = (Bytef*)buffer.begin();
zlib->stream.avail_out = buffer.size();
rc = inflate(&(zlib->stream), Z_SYNC_FLUSH);
if(rc != Z_OK && rc != Z_STREAM_END)
{
clear();
throw Exception("Zlib_Decompression: Error finalizing decompression");
}
send(buffer.begin(), buffer.size() - zlib->stream.avail_out);
}
clear();
}
/*************************************************
* Clean up Decompression Context *
*************************************************/
void Zlib_Decompression::clear()
{
no_writes = true;
if(zlib)
{
inflateEnd(&(zlib->stream));
delete zlib;
zlib = 0;
}
buffer.clear();
}
}
|
