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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 #include "module.h"
29
30 /**************************************************************/
31
32 #define HEADER_MAGIC "WithoutFreeSpace"
33 #define HEADER_VERSION 2
34 #define HEADER_SIZE 64
35
36 // always little-endian
37 struct parallels_header {
38 char magic[16]; // "WithoutFreeSpace"
39 uint32_t version;
40 uint32_t heads;
41 uint32_t cylinders;
42 uint32_t tracks;
43 uint32_t catalog_entries;
44 uint32_t nb_sectors;
45 char padding[24];
46 } __attribute__((packed));
47
48 typedef struct BDRVParallelsState {
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, int flags)
71 {
72 BDRVParallelsState *s = bs->opaque;
73 int i;
74 struct parallels_header ph;
75
76 bs->read_only = 1; // no write support yet
77
78 if (bdrv_pread(bs->file, 0, &ph, sizeof(ph)) != sizeof(ph))
79 goto fail;
80
81 if (memcmp(ph.magic, HEADER_MAGIC, 16) ||
82 (le32_to_cpu(ph.version) != HEADER_VERSION)) {
83 goto fail;
84 }
85
86 bs->total_sectors = le32_to_cpu(ph.nb_sectors);
87
88 s->tracks = le32_to_cpu(ph.tracks);
89
90 s->catalog_size = le32_to_cpu(ph.catalog_entries);
91 s->catalog_bitmap = qemu_malloc(s->catalog_size * 4);
92 if (bdrv_pread(bs->file, 64, s->catalog_bitmap, s->catalog_size * 4) !=
93 s->catalog_size * 4)
94 goto fail;
95 for (i = 0; i < s->catalog_size; i++)
96 le32_to_cpus(&s->catalog_bitmap[i]);
97
98 return 0;
99 fail:
100 if (s->catalog_bitmap)
101 qemu_free(s->catalog_bitmap);
102 return -1;
103 }
104
105 static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
106 {
107 BDRVParallelsState *s = bs->opaque;
108 uint32_t index, offset;
109
110 index = sector_num / s->tracks;
111 offset = sector_num % s->tracks;
112
113 /* not allocated */
114 if ((index > s->catalog_size) || (s->catalog_bitmap[index] == 0))
115 return -1;
116 return (uint64_t)(s->catalog_bitmap[index] + offset) * 512;
117 }
118
119 static int parallels_read(BlockDriverState *bs, int64_t sector_num,
120 uint8_t *buf, int nb_sectors)
121 {
122 while (nb_sectors > 0) {
123 int64_t position = seek_to_sector(bs, sector_num);
124 if (position >= 0) {
125 if (bdrv_pread(bs->file, position, buf, 512) != 512)
126 return -1;
127 } else {
128 memset(buf, 0, 512);
129 }
130 nb_sectors--;
131 sector_num++;
132 buf += 512;
133 }
134 return 0;
135 }
136
137 static void parallels_close(BlockDriverState *bs)
138 {
139 BDRVParallelsState *s = bs->opaque;
140 qemu_free(s->catalog_bitmap);
141 }
142
143 static BlockDriver bdrv_parallels = {
144 .format_name = "parallels",
145 .instance_size = sizeof(BDRVParallelsState),
146 .bdrv_probe = parallels_probe,
147 .bdrv_open = parallels_open,
148 .bdrv_read = parallels_read,
149 .bdrv_close = parallels_close,
150 };
151
152 static void bdrv_parallels_init(void)
153 {
154 bdrv_register(&bdrv_parallels);
155 }
156
157 block_init(bdrv_parallels_init);