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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];
1.1.1.4 ! root 46: } QEMU_PACKED;
1.1 root 47:
48: typedef struct BDRVParallelsState {
1.1.1.4 ! root 49: CoMutex lock;
1.1 root 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:
1.1.1.3 root 71: static int parallels_open(BlockDriverState *bs, int flags)
1.1 root 72: {
73: BDRVParallelsState *s = bs->opaque;
1.1.1.3 root 74: int i;
1.1 root 75: struct parallels_header ph;
76:
77: bs->read_only = 1; // no write support yet
78:
1.1.1.3 root 79: if (bdrv_pread(bs->file, 0, &ph, sizeof(ph)) != sizeof(ph))
1.1 root 80: goto fail;
81:
82: if (memcmp(ph.magic, HEADER_MAGIC, 16) ||
83: (le32_to_cpu(ph.version) != HEADER_VERSION)) {
84: goto fail;
85: }
86:
87: bs->total_sectors = le32_to_cpu(ph.nb_sectors);
88:
89: s->tracks = le32_to_cpu(ph.tracks);
90:
91: s->catalog_size = le32_to_cpu(ph.catalog_entries);
1.1.1.4 ! root 92: s->catalog_bitmap = g_malloc(s->catalog_size * 4);
1.1.1.3 root 93: if (bdrv_pread(bs->file, 64, s->catalog_bitmap, s->catalog_size * 4) !=
1.1 root 94: s->catalog_size * 4)
95: goto fail;
96: for (i = 0; i < s->catalog_size; i++)
97: le32_to_cpus(&s->catalog_bitmap[i]);
98:
1.1.1.4 ! root 99: qemu_co_mutex_init(&s->lock);
1.1 root 100: return 0;
101: fail:
102: if (s->catalog_bitmap)
1.1.1.4 ! root 103: g_free(s->catalog_bitmap);
1.1 root 104: return -1;
105: }
106:
1.1.1.3 root 107: static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
1.1 root 108: {
109: BDRVParallelsState *s = bs->opaque;
1.1.1.2 root 110: uint32_t index, offset;
1.1 root 111:
112: index = sector_num / s->tracks;
113: offset = sector_num % s->tracks;
114:
1.1.1.3 root 115: /* not allocated */
1.1 root 116: if ((index > s->catalog_size) || (s->catalog_bitmap[index] == 0))
117: return -1;
1.1.1.3 root 118: return (uint64_t)(s->catalog_bitmap[index] + offset) * 512;
1.1 root 119: }
120:
121: static int parallels_read(BlockDriverState *bs, int64_t sector_num,
122: uint8_t *buf, int nb_sectors)
123: {
124: while (nb_sectors > 0) {
1.1.1.3 root 125: int64_t position = seek_to_sector(bs, sector_num);
126: if (position >= 0) {
127: if (bdrv_pread(bs->file, position, buf, 512) != 512)
128: return -1;
129: } else {
1.1 root 130: memset(buf, 0, 512);
1.1.1.3 root 131: }
1.1 root 132: nb_sectors--;
133: sector_num++;
134: buf += 512;
135: }
136: return 0;
137: }
138:
1.1.1.4 ! root 139: static coroutine_fn int parallels_co_read(BlockDriverState *bs, int64_t sector_num,
! 140: uint8_t *buf, int nb_sectors)
! 141: {
! 142: int ret;
! 143: BDRVParallelsState *s = bs->opaque;
! 144: qemu_co_mutex_lock(&s->lock);
! 145: ret = parallels_read(bs, sector_num, buf, nb_sectors);
! 146: qemu_co_mutex_unlock(&s->lock);
! 147: return ret;
! 148: }
! 149:
1.1 root 150: static void parallels_close(BlockDriverState *bs)
151: {
152: BDRVParallelsState *s = bs->opaque;
1.1.1.4 ! root 153: g_free(s->catalog_bitmap);
1.1 root 154: }
155:
156: static BlockDriver bdrv_parallels = {
157: .format_name = "parallels",
158: .instance_size = sizeof(BDRVParallelsState),
159: .bdrv_probe = parallels_probe,
160: .bdrv_open = parallels_open,
1.1.1.4 ! root 161: .bdrv_read = parallels_co_read,
1.1 root 162: .bdrv_close = parallels_close,
163: };
164:
165: static void bdrv_parallels_init(void)
166: {
167: bdrv_register(&bdrv_parallels);
168: }
169:
170: block_init(bdrv_parallels_init);
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