ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 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 | */ |
pbrook | faf0796 | 2007-11-11 02:51:17 +0000 | [diff] [blame] | 26 | #include "qemu-common.h" |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 27 | #include "block_int.h" |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 28 | #include "module.h" |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 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 | |
Naphtali Sprei | 0a7fc98 | 2010-01-21 14:40:41 +0200 | [diff] [blame] | 77 | fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE); |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 78 | if (fd < 0) { |
Naphtali Sprei | 0a7fc98 | 2010-01-21 14:40:41 +0200 | [diff] [blame] | 79 | return -1; |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | bs->read_only = 1; // no write support yet |
| 83 | |
| 84 | s->fd = fd; |
| 85 | |
| 86 | if (read(fd, &ph, sizeof(ph)) != sizeof(ph)) |
| 87 | goto fail; |
| 88 | |
| 89 | if (memcmp(ph.magic, HEADER_MAGIC, 16) || |
| 90 | (le32_to_cpu(ph.version) != HEADER_VERSION)) { |
| 91 | goto fail; |
| 92 | } |
| 93 | |
| 94 | bs->total_sectors = le32_to_cpu(ph.nb_sectors); |
| 95 | |
| 96 | if (lseek(s->fd, 64, SEEK_SET) != 64) |
| 97 | goto fail; |
| 98 | |
| 99 | s->tracks = le32_to_cpu(ph.tracks); |
| 100 | |
| 101 | s->catalog_size = le32_to_cpu(ph.catalog_entries); |
| 102 | s->catalog_bitmap = qemu_malloc(s->catalog_size * 4); |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 103 | if (read(s->fd, s->catalog_bitmap, s->catalog_size * 4) != |
| 104 | s->catalog_size * 4) |
| 105 | goto fail; |
| 106 | for (i = 0; i < s->catalog_size; i++) |
| 107 | le32_to_cpus(&s->catalog_bitmap[i]); |
| 108 | |
| 109 | return 0; |
| 110 | fail: |
| 111 | if (s->catalog_bitmap) |
| 112 | qemu_free(s->catalog_bitmap); |
| 113 | close(fd); |
| 114 | return -1; |
| 115 | } |
| 116 | |
| 117 | static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num) |
| 118 | { |
| 119 | BDRVParallelsState *s = bs->opaque; |
David Woodhouse | c34d245 | 2009-11-07 14:10:01 +0000 | [diff] [blame] | 120 | uint32_t index, offset; |
| 121 | uint64_t position; |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 122 | |
| 123 | index = sector_num / s->tracks; |
| 124 | offset = sector_num % s->tracks; |
| 125 | |
| 126 | // not allocated |
| 127 | if ((index > s->catalog_size) || (s->catalog_bitmap[index] == 0)) |
| 128 | return -1; |
| 129 | |
David Woodhouse | c34d245 | 2009-11-07 14:10:01 +0000 | [diff] [blame] | 130 | position = (uint64_t)(s->catalog_bitmap[index] + offset) * 512; |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 131 | |
| 132 | // fprintf(stderr, "sector: %llx index=%x offset=%x pointer=%x position=%x\n", |
| 133 | // sector_num, index, offset, s->catalog_bitmap[index], position); |
| 134 | |
| 135 | if (lseek(s->fd, position, SEEK_SET) != position) |
| 136 | return -1; |
| 137 | |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | static int parallels_read(BlockDriverState *bs, int64_t sector_num, |
| 142 | uint8_t *buf, int nb_sectors) |
| 143 | { |
| 144 | BDRVParallelsState *s = bs->opaque; |
| 145 | |
| 146 | while (nb_sectors > 0) { |
| 147 | if (!seek_to_sector(bs, sector_num)) { |
| 148 | if (read(s->fd, buf, 512) != 512) |
| 149 | return -1; |
| 150 | } else |
| 151 | memset(buf, 0, 512); |
| 152 | nb_sectors--; |
| 153 | sector_num++; |
| 154 | buf += 512; |
| 155 | } |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | static void parallels_close(BlockDriverState *bs) |
| 160 | { |
| 161 | BDRVParallelsState *s = bs->opaque; |
| 162 | qemu_free(s->catalog_bitmap); |
| 163 | close(s->fd); |
| 164 | } |
| 165 | |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 166 | static BlockDriver bdrv_parallels = { |
aurel32 | e60f469 | 2009-03-07 22:00:29 +0000 | [diff] [blame] | 167 | .format_name = "parallels", |
| 168 | .instance_size = sizeof(BDRVParallelsState), |
| 169 | .bdrv_probe = parallels_probe, |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 170 | .bdrv_file_open = parallels_open, |
aurel32 | e60f469 | 2009-03-07 22:00:29 +0000 | [diff] [blame] | 171 | .bdrv_read = parallels_read, |
| 172 | .bdrv_close = parallels_close, |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 173 | }; |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 174 | |
| 175 | static void bdrv_parallels_init(void) |
| 176 | { |
| 177 | bdrv_register(&bdrv_parallels); |
| 178 | } |
| 179 | |
| 180 | block_init(bdrv_parallels_init); |