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
|
/******************************************************
Copyright (c) 2011-2017 Percona LLC and/or its affiliates.
The xbstream format reader implementation.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*******************************************************/
#include <mysql_version.h>
#include <my_base.h>
#include <zlib.h>
#include "common.h"
#include "xbstream.h"
#include "crc_glue.h"
/* Allocate 1 MB for the payload buffer initially */
#define INIT_BUFFER_LEN (1024 * 1024)
#ifndef MY_OFF_T_MAX
#define MY_OFF_T_MAX (~(my_off_t)0UL)
#endif
struct xb_rstream_struct {
my_off_t offset;
File fd;
};
xb_rstream_t *
xb_stream_read_new(void)
{
xb_rstream_t *stream;
stream = (xb_rstream_t *) my_malloc(sizeof(xb_rstream_t), MYF(MY_FAE));
#ifdef __WIN__
setmode(fileno(stdin), _O_BINARY);
#endif
stream->fd = my_fileno(stdin);
stream->offset = 0;
return stream;
}
static inline
xb_chunk_type_t
validate_chunk_type(uchar code)
{
switch ((xb_chunk_type_t) code) {
case XB_CHUNK_TYPE_PAYLOAD:
case XB_CHUNK_TYPE_EOF:
return (xb_chunk_type_t) code;
default:
return XB_CHUNK_TYPE_UNKNOWN;
}
}
xb_rstream_result_t
xb_stream_validate_checksum(xb_rstream_chunk_t *chunk)
{
ulong checksum;
checksum = crc32_iso3309(0, (unsigned char *)chunk->data, (uint)chunk->length);
if (checksum != chunk->checksum) {
msg("xb_stream_read_chunk(): invalid checksum at offset "
"0x%llx: expected 0x%lx, read 0x%lx.",
(ulonglong) chunk->checksum_offset, chunk->checksum,
checksum);
return XB_STREAM_READ_ERROR;
}
return XB_STREAM_READ_CHUNK;
}
#define F_READ(buf,len) \
do { \
if (xb_read_full(fd, (uchar *)buf, len) < len) { \
msg("xb_stream_read_chunk(): my_read() failed."); \
goto err; \
} \
} while (0)
xb_rstream_result_t
xb_stream_read_chunk(xb_rstream_t *stream, xb_rstream_chunk_t *chunk)
{
uchar tmpbuf[16];
uchar *ptr = tmpbuf;
uint pathlen;
size_t tbytes;
ulonglong ullval;
File fd = stream->fd;
xb_ad(sizeof(tmpbuf) >= CHUNK_HEADER_CONSTANT_LEN);
/* This is the only place where we expect EOF, so read with
xb_read_full() rather than F_READ() */
tbytes = xb_read_full(fd, ptr, CHUNK_HEADER_CONSTANT_LEN);
if (tbytes == 0) {
return XB_STREAM_READ_EOF;
} else if (tbytes < CHUNK_HEADER_CONSTANT_LEN) {
msg("xb_stream_read_chunk(): unexpected end of stream at "
"offset 0x%llx.", stream->offset);
goto err;
}
ptr = tmpbuf;
/* Chunk magic value */
if (memcmp(tmpbuf, XB_STREAM_CHUNK_MAGIC, 8)) {
msg("xb_stream_read_chunk(): wrong chunk magic at offset "
"0x%llx.", (ulonglong) stream->offset);
goto err;
}
ptr += 8;
stream->offset += 8;
/* Chunk flags */
chunk->flags = *ptr++;
stream->offset++;
/* Chunk type, ignore unknown ones if ignorable flag is set */
chunk->type = validate_chunk_type(*ptr);
if (chunk->type == XB_CHUNK_TYPE_UNKNOWN &&
!(chunk->flags & XB_STREAM_FLAG_IGNORABLE)) {
msg("xb_stream_read_chunk(): unknown chunk type 0x%lu at "
"offset 0x%llx.", (ulong) *ptr,
(ulonglong) stream->offset);
goto err;
}
ptr++;
stream->offset++;
/* Path length */
pathlen = uint4korr(ptr);
if (pathlen >= FN_REFLEN) {
msg("xb_stream_read_chunk(): path length (%lu) is too large at "
"offset 0x%llx.", (ulong) pathlen, stream->offset);
goto err;
}
chunk->pathlen = pathlen;
stream->offset +=4;
xb_ad((ptr + 4 - tmpbuf) == CHUNK_HEADER_CONSTANT_LEN);
/* Path */
if (chunk->pathlen > 0) {
F_READ((uchar *) chunk->path, pathlen);
stream->offset += pathlen;
}
chunk->path[pathlen] = '\0';
if (chunk->type == XB_CHUNK_TYPE_EOF) {
return XB_STREAM_READ_CHUNK;
}
/* Payload length */
F_READ(tmpbuf, 16);
ullval = uint8korr(tmpbuf);
if (ullval > (ulonglong) SIZE_T_MAX) {
msg("xb_stream_read_chunk(): chunk length is too large at "
"offset 0x%llx: 0x%llx.", (ulonglong) stream->offset,
ullval);
goto err;
}
chunk->length = (size_t) ullval;
stream->offset += 8;
/* Payload offset */
ullval = uint8korr(tmpbuf + 8);
if (ullval > (ulonglong) MY_OFF_T_MAX) {
msg("xb_stream_read_chunk(): chunk offset is too large at "
"offset 0x%llx: 0x%llx.", (ulonglong) stream->offset,
ullval);
goto err;
}
chunk->offset = (my_off_t) ullval;
stream->offset += 8;
/* Reallocate the buffer if needed */
if (chunk->length > chunk->buflen) {
chunk->data = my_realloc(chunk->data, chunk->length,
MYF(MY_WME | MY_ALLOW_ZERO_PTR));
if (chunk->data == NULL) {
msg("xb_stream_read_chunk(): failed to increase buffer "
"to %lu bytes.", (ulong) chunk->length);
goto err;
}
chunk->buflen = chunk->length;
}
/* Checksum */
F_READ(tmpbuf, 4);
chunk->checksum = uint4korr(tmpbuf);
chunk->checksum_offset = stream->offset;
/* Payload */
if (chunk->length > 0) {
F_READ(chunk->data, chunk->length);
stream->offset += chunk->length;
}
stream->offset += 4;
return XB_STREAM_READ_CHUNK;
err:
return XB_STREAM_READ_ERROR;
}
int
xb_stream_read_done(xb_rstream_t *stream)
{
my_free(stream);
return 0;
}
|
