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6ada7453
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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 */
faf07963 26#include "qemu-common.h"
6ada7453 27#include "block_int.h"
5efa9d5a 28#include "module.h"
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29
30/**************************************************************/
31
32#define HEADER_MAGIC "WithoutFreeSpace"
33#define HEADER_VERSION 2
34#define HEADER_SIZE 64
35
36// always little-endian
37struct 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
48typedef struct BDRVParallelsState {
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49
50 uint32_t *catalog_bitmap;
51 int catalog_size;
52
53 int tracks;
54} BDRVParallelsState;
55
56static 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
1dec5a70 70static int parallels_open(BlockDriverState *bs, int flags)
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71{
72 BDRVParallelsState *s = bs->opaque;
1dec5a70 73 int i;
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74 struct parallels_header ph;
75
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76 bs->read_only = 1; // no write support yet
77
1dec5a70 78 if (bdrv_pread(bs->file, 0, &ph, sizeof(ph)) != sizeof(ph))
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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
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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);
1dec5a70 92 if (bdrv_pread(bs->file, 64, s->catalog_bitmap, s->catalog_size * 4) !=
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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;
99fail:
100 if (s->catalog_bitmap)
101 qemu_free(s->catalog_bitmap);
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102 return -1;
103}
104
9d8b88f6 105static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
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106{
107 BDRVParallelsState *s = bs->opaque;
c34d2451 108 uint32_t index, offset;
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109
110 index = sector_num / s->tracks;
111 offset = sector_num % s->tracks;
112
9d8b88f6 113 /* not allocated */
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114 if ((index > s->catalog_size) || (s->catalog_bitmap[index] == 0))
115 return -1;
9d8b88f6 116 return (uint64_t)(s->catalog_bitmap[index] + offset) * 512;
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117}
118
119static int parallels_read(BlockDriverState *bs, int64_t sector_num,
120 uint8_t *buf, int nb_sectors)
121{
6ada7453 122 while (nb_sectors > 0) {
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123 int64_t position = seek_to_sector(bs, sector_num);
124 if (position >= 0) {
1dec5a70 125 if (bdrv_pread(bs->file, position, buf, 512) != 512)
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126 return -1;
127 } else {
6ada7453 128 memset(buf, 0, 512);
9d8b88f6 129 }
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130 nb_sectors--;
131 sector_num++;
132 buf += 512;
133 }
134 return 0;
135}
136
137static void parallels_close(BlockDriverState *bs)
138{
139 BDRVParallelsState *s = bs->opaque;
140 qemu_free(s->catalog_bitmap);
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141}
142
5efa9d5a 143static BlockDriver bdrv_parallels = {
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144 .format_name = "parallels",
145 .instance_size = sizeof(BDRVParallelsState),
146 .bdrv_probe = parallels_probe,
1dec5a70 147 .bdrv_open = parallels_open,
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148 .bdrv_read = parallels_read,
149 .bdrv_close = parallels_close,
6ada7453 150};
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151
152static void bdrv_parallels_init(void)
153{
154 bdrv_register(&bdrv_parallels);
155}
156
157block_init(bdrv_parallels_init);