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
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 {
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
70static 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;
99fail:
100    if (s->catalog_bitmap)
101	qemu_free(s->catalog_bitmap);
102    return -1;
103}
104
105static 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
119static 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
137static void parallels_close(BlockDriverState *bs)
138{
139    BDRVParallelsState *s = bs->opaque;
140    qemu_free(s->catalog_bitmap);
141}
142
143static 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
152static void bdrv_parallels_init(void)
153{
154    bdrv_register(&bdrv_parallels);
155}
156
157block_init(bdrv_parallels_init);
158