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1.1 root 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: int fd;
50:
51: uint32_t *catalog_bitmap;
52: int catalog_size;
53:
54: int tracks;
55: } BDRVParallelsState;
56:
57: static int parallels_probe(const uint8_t *buf, int buf_size, const char *filename)
58: {
59: const struct parallels_header *ph = (const void *)buf;
60:
61: if (buf_size < HEADER_SIZE)
62: return 0;
63:
64: if (!memcmp(ph->magic, HEADER_MAGIC, 16) &&
65: (le32_to_cpu(ph->version) == HEADER_VERSION))
66: return 100;
67:
68: return 0;
69: }
70:
71: static int parallels_open(BlockDriverState *bs, const char *filename, int flags)
72: {
73: BDRVParallelsState *s = bs->opaque;
74: int fd, i;
75: struct parallels_header ph;
76:
77: fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE);
78: if (fd < 0) {
79: fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
80: if (fd < 0)
81: return -1;
82: }
83:
84: bs->read_only = 1; // no write support yet
85:
86: s->fd = fd;
87:
88: if (read(fd, &ph, sizeof(ph)) != sizeof(ph))
89: goto fail;
90:
91: if (memcmp(ph.magic, HEADER_MAGIC, 16) ||
92: (le32_to_cpu(ph.version) != HEADER_VERSION)) {
93: goto fail;
94: }
95:
96: bs->total_sectors = le32_to_cpu(ph.nb_sectors);
97:
98: if (lseek(s->fd, 64, SEEK_SET) != 64)
99: goto fail;
100:
101: s->tracks = le32_to_cpu(ph.tracks);
102:
103: s->catalog_size = le32_to_cpu(ph.catalog_entries);
104: s->catalog_bitmap = qemu_malloc(s->catalog_size * 4);
105: if (read(s->fd, s->catalog_bitmap, s->catalog_size * 4) !=
106: s->catalog_size * 4)
107: goto fail;
108: for (i = 0; i < s->catalog_size; i++)
109: le32_to_cpus(&s->catalog_bitmap[i]);
110:
111: return 0;
112: fail:
113: if (s->catalog_bitmap)
114: qemu_free(s->catalog_bitmap);
115: close(fd);
116: return -1;
117: }
118:
119: static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num)
120: {
121: BDRVParallelsState *s = bs->opaque;
122: uint32_t index, offset, position;
123:
124: index = sector_num / s->tracks;
125: offset = sector_num % s->tracks;
126:
127: // not allocated
128: if ((index > s->catalog_size) || (s->catalog_bitmap[index] == 0))
129: return -1;
130:
131: position = (s->catalog_bitmap[index] + offset) * 512;
132:
133: // fprintf(stderr, "sector: %llx index=%x offset=%x pointer=%x position=%x\n",
134: // sector_num, index, offset, s->catalog_bitmap[index], position);
135:
136: if (lseek(s->fd, position, SEEK_SET) != position)
137: return -1;
138:
139: return 0;
140: }
141:
142: static int parallels_read(BlockDriverState *bs, int64_t sector_num,
143: uint8_t *buf, int nb_sectors)
144: {
145: BDRVParallelsState *s = bs->opaque;
146:
147: while (nb_sectors > 0) {
148: if (!seek_to_sector(bs, sector_num)) {
149: if (read(s->fd, buf, 512) != 512)
150: return -1;
151: } else
152: memset(buf, 0, 512);
153: nb_sectors--;
154: sector_num++;
155: buf += 512;
156: }
157: return 0;
158: }
159:
160: static void parallels_close(BlockDriverState *bs)
161: {
162: BDRVParallelsState *s = bs->opaque;
163: qemu_free(s->catalog_bitmap);
164: close(s->fd);
165: }
166:
167: static BlockDriver bdrv_parallels = {
168: .format_name = "parallels",
169: .instance_size = sizeof(BDRVParallelsState),
170: .bdrv_probe = parallels_probe,
171: .bdrv_open = parallels_open,
172: .bdrv_read = parallels_read,
173: .bdrv_close = parallels_close,
174: };
175:
176: static void bdrv_parallels_init(void)
177: {
178: bdrv_register(&bdrv_parallels);
179: }
180:
181: block_init(bdrv_parallels_init);
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