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 } QEMU_PACKED; 47 48 typedef struct BDRVParallelsState { 49 50 uint32_t *catalog_bitmap; 51 int catalog_size; 52 53 int tracks; 54 } BDRVParallelsState; 55 56 static 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 70 static 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 = g_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; 99 fail: 100 if (s->catalog_bitmap) 101 g_free(s->catalog_bitmap); 102 return -1; 103 } 104 105 static 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 } 118 119 static 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 } 136 137 static void parallels_close(BlockDriverState *bs) 138 { 139 BDRVParallelsState *s = bs->opaque; 140 g_free(s->catalog_bitmap); 141 } 142 143 static 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 }; 151 152 static void bdrv_parallels_init(void) 153 { 154 bdrv_register(&bdrv_parallels); 155 } 156 157 block_init(bdrv_parallels_init); 158