root / block-parallels.c @ f36672ae
History | View | Annotate | Download (4.7 kB)
1 |
/*
|
---|---|
2 |
* Block driver for Parallels disk image format
|
3 |
*
|
4 |
* Copyright (c) 2007 Alex Beregszaszi
|
5 |
*
|
6 |
* This code is based on comparing different disk images created by Parallels.
|
7 |
*
|
8 |
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
9 |
* of this software and associated documentation files (the "Software"), to deal
|
10 |
* in the Software without restriction, including without limitation the rights
|
11 |
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
12 |
* copies of the Software, and to permit persons to whom the Software is
|
13 |
* furnished to do so, subject to the following conditions:
|
14 |
*
|
15 |
* The above copyright notice and this permission notice shall be included in
|
16 |
* all copies or substantial portions of the Software.
|
17 |
*
|
18 |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
19 |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
20 |
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
21 |
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
22 |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
23 |
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
24 |
* THE SOFTWARE.
|
25 |
*/
|
26 |
#include "qemu-common.h" |
27 |
#include "block_int.h" |
28 |
|
29 |
/**************************************************************/
|
30 |
|
31 |
#define HEADER_MAGIC "WithoutFreeSpace" |
32 |
#define HEADER_VERSION 2 |
33 |
#define HEADER_SIZE 64 |
34 |
|
35 |
// always little-endian
|
36 |
struct parallels_header {
|
37 |
char magic[16]; // "WithoutFreeSpace" |
38 |
uint32_t version; |
39 |
uint32_t heads; |
40 |
uint32_t cylinders; |
41 |
uint32_t tracks; |
42 |
uint32_t catalog_entries; |
43 |
uint32_t nb_sectors; |
44 |
char padding[24]; |
45 |
} __attribute__((packed)); |
46 |
|
47 |
typedef struct BDRVParallelsState { |
48 |
int fd;
|
49 |
|
50 |
uint32_t *catalog_bitmap; |
51 |
int catalog_size;
|
52 |
|
53 |
int tracks;
|
54 |
} BDRVParallelsState; |
55 |
|
56 |
static int parallels_probe(const uint8_t *buf, int buf_size, const char *filename) |
57 |
{ |
58 |
const struct parallels_header *ph = (const void *)buf; |
59 |
|
60 |
if (buf_size < HEADER_SIZE)
|
61 |
return 0; |
62 |
|
63 |
if (!memcmp(ph->magic, HEADER_MAGIC, 16) && |
64 |
(le32_to_cpu(ph->version) == HEADER_VERSION)) |
65 |
return 100; |
66 |
|
67 |
return 0; |
68 |
} |
69 |
|
70 |
static int parallels_open(BlockDriverState *bs, const char *filename, int flags) |
71 |
{ |
72 |
BDRVParallelsState *s = bs->opaque; |
73 |
int fd, i;
|
74 |
struct parallels_header ph;
|
75 |
|
76 |
fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE); |
77 |
if (fd < 0) { |
78 |
fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE); |
79 |
if (fd < 0) |
80 |
return -1; |
81 |
} |
82 |
|
83 |
bs->read_only = 1; // no write support yet |
84 |
|
85 |
s->fd = fd; |
86 |
|
87 |
if (read(fd, &ph, sizeof(ph)) != sizeof(ph)) |
88 |
goto fail;
|
89 |
|
90 |
if (memcmp(ph.magic, HEADER_MAGIC, 16) || |
91 |
(le32_to_cpu(ph.version) != HEADER_VERSION)) { |
92 |
goto fail;
|
93 |
} |
94 |
|
95 |
bs->total_sectors = le32_to_cpu(ph.nb_sectors); |
96 |
|
97 |
if (lseek(s->fd, 64, SEEK_SET) != 64) |
98 |
goto fail;
|
99 |
|
100 |
s->tracks = le32_to_cpu(ph.tracks); |
101 |
|
102 |
s->catalog_size = le32_to_cpu(ph.catalog_entries); |
103 |
s->catalog_bitmap = qemu_malloc(s->catalog_size * 4);
|
104 |
if (!s->catalog_bitmap)
|
105 |
goto fail;
|
106 |
if (read(s->fd, s->catalog_bitmap, s->catalog_size * 4) != |
107 |
s->catalog_size * 4)
|
108 |
goto fail;
|
109 |
for (i = 0; i < s->catalog_size; i++) |
110 |
le32_to_cpus(&s->catalog_bitmap[i]); |
111 |
|
112 |
return 0; |
113 |
fail:
|
114 |
if (s->catalog_bitmap)
|
115 |
qemu_free(s->catalog_bitmap); |
116 |
close(fd); |
117 |
return -1; |
118 |
} |
119 |
|
120 |
static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num) |
121 |
{ |
122 |
BDRVParallelsState *s = bs->opaque; |
123 |
uint32_t index, offset, position; |
124 |
|
125 |
index = sector_num / s->tracks; |
126 |
offset = sector_num % s->tracks; |
127 |
|
128 |
// not allocated
|
129 |
if ((index > s->catalog_size) || (s->catalog_bitmap[index] == 0)) |
130 |
return -1; |
131 |
|
132 |
position = (s->catalog_bitmap[index] + offset) * 512;
|
133 |
|
134 |
// fprintf(stderr, "sector: %llx index=%x offset=%x pointer=%x position=%x\n",
|
135 |
// sector_num, index, offset, s->catalog_bitmap[index], position);
|
136 |
|
137 |
if (lseek(s->fd, position, SEEK_SET) != position)
|
138 |
return -1; |
139 |
|
140 |
return 0; |
141 |
} |
142 |
|
143 |
static int parallels_read(BlockDriverState *bs, int64_t sector_num, |
144 |
uint8_t *buf, int nb_sectors)
|
145 |
{ |
146 |
BDRVParallelsState *s = bs->opaque; |
147 |
|
148 |
while (nb_sectors > 0) { |
149 |
if (!seek_to_sector(bs, sector_num)) {
|
150 |
if (read(s->fd, buf, 512) != 512) |
151 |
return -1; |
152 |
} else
|
153 |
memset(buf, 0, 512); |
154 |
nb_sectors--; |
155 |
sector_num++; |
156 |
buf += 512;
|
157 |
} |
158 |
return 0; |
159 |
} |
160 |
|
161 |
static void parallels_close(BlockDriverState *bs) |
162 |
{ |
163 |
BDRVParallelsState *s = bs->opaque; |
164 |
qemu_free(s->catalog_bitmap); |
165 |
close(s->fd); |
166 |
} |
167 |
|
168 |
BlockDriver bdrv_parallels = { |
169 |
"parallels",
|
170 |
sizeof(BDRVParallelsState),
|
171 |
parallels_probe, |
172 |
parallels_open, |
173 |
parallels_read, |
174 |
NULL,
|
175 |
parallels_close, |
176 |
}; |