bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 1 | /* |
bellard | 585d0ed | 2004-12-12 11:24:44 +0000 | [diff] [blame] | 2 | * QEMU Block driver for CLOOP images |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3 | * |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 4 | * Copyright (c) 2004 Johannes E. Schindelin |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 5 | * |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
pbrook | faf0796 | 2007-11-11 02:51:17 +0000 | [diff] [blame] | 24 | #include "qemu-common.h" |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 25 | #include "block_int.h" |
| 26 | #include <zlib.h> |
| 27 | |
| 28 | typedef struct BDRVCloopState { |
| 29 | int fd; |
| 30 | uint32_t block_size; |
| 31 | uint32_t n_blocks; |
| 32 | uint64_t* offsets; |
| 33 | uint32_t sectors_per_block; |
| 34 | uint32_t current_block; |
bellard | 28a5c9c | 2006-02-01 21:43:52 +0000 | [diff] [blame] | 35 | uint8_t *compressed_block; |
| 36 | uint8_t *uncompressed_block; |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 37 | z_stream zstream; |
| 38 | } BDRVCloopState; |
| 39 | |
| 40 | static int cloop_probe(const uint8_t *buf, int buf_size, const char *filename) |
| 41 | { |
| 42 | const char* magic_version_2_0="#!/bin/sh\n" |
| 43 | "#V2.0 Format\n" |
| 44 | "modprobe cloop file=$0 && mount -r -t iso9660 /dev/cloop $1\n"; |
| 45 | int length=strlen(magic_version_2_0); |
| 46 | if(length>buf_size) |
| 47 | length=buf_size; |
| 48 | if(!memcmp(magic_version_2_0,buf,length)) |
| 49 | return 2; |
| 50 | return 0; |
| 51 | } |
| 52 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 53 | static int cloop_open(BlockDriverState *bs, const char *filename, int flags) |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 54 | { |
| 55 | BDRVCloopState *s = bs->opaque; |
| 56 | uint32_t offsets_size,max_compressed_block_size=1,i; |
| 57 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 58 | s->fd = open(filename, O_RDONLY | O_BINARY); |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 59 | if (s->fd < 0) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 60 | return -errno; |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 61 | bs->read_only = 1; |
| 62 | |
| 63 | /* read header */ |
| 64 | if(lseek(s->fd,128,SEEK_SET)<0) { |
| 65 | cloop_close: |
| 66 | close(s->fd); |
| 67 | return -1; |
| 68 | } |
| 69 | if(read(s->fd,&s->block_size,4)<4) |
| 70 | goto cloop_close; |
| 71 | s->block_size=be32_to_cpu(s->block_size); |
| 72 | if(read(s->fd,&s->n_blocks,4)<4) |
| 73 | goto cloop_close; |
| 74 | s->n_blocks=be32_to_cpu(s->n_blocks); |
| 75 | |
| 76 | /* read offsets */ |
| 77 | offsets_size=s->n_blocks*sizeof(uint64_t); |
| 78 | if(!(s->offsets=(uint64_t*)malloc(offsets_size))) |
| 79 | goto cloop_close; |
| 80 | if(read(s->fd,s->offsets,offsets_size)<offsets_size) |
| 81 | goto cloop_close; |
| 82 | for(i=0;i<s->n_blocks;i++) { |
| 83 | s->offsets[i]=be64_to_cpu(s->offsets[i]); |
| 84 | if(i>0) { |
| 85 | uint32_t size=s->offsets[i]-s->offsets[i-1]; |
| 86 | if(size>max_compressed_block_size) |
| 87 | max_compressed_block_size=size; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | /* initialize zlib engine */ |
bellard | 28a5c9c | 2006-02-01 21:43:52 +0000 | [diff] [blame] | 92 | if(!(s->compressed_block = malloc(max_compressed_block_size+1))) |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 93 | goto cloop_close; |
bellard | 28a5c9c | 2006-02-01 21:43:52 +0000 | [diff] [blame] | 94 | if(!(s->uncompressed_block = malloc(s->block_size))) |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 95 | goto cloop_close; |
| 96 | if(inflateInit(&s->zstream) != Z_OK) |
| 97 | goto cloop_close; |
| 98 | s->current_block=s->n_blocks; |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 99 | |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 100 | s->sectors_per_block = s->block_size/512; |
| 101 | bs->total_sectors = s->n_blocks*s->sectors_per_block; |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | static inline int cloop_read_block(BDRVCloopState *s,int block_num) |
| 106 | { |
| 107 | if(s->current_block != block_num) { |
| 108 | int ret; |
| 109 | uint32_t bytes = s->offsets[block_num+1]-s->offsets[block_num]; |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 110 | |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 111 | lseek(s->fd, s->offsets[block_num], SEEK_SET); |
| 112 | ret = read(s->fd, s->compressed_block, bytes); |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 113 | if (ret != bytes) |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 114 | return -1; |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 115 | |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 116 | s->zstream.next_in = s->compressed_block; |
| 117 | s->zstream.avail_in = bytes; |
| 118 | s->zstream.next_out = s->uncompressed_block; |
| 119 | s->zstream.avail_out = s->block_size; |
| 120 | ret = inflateReset(&s->zstream); |
| 121 | if(ret != Z_OK) |
| 122 | return -1; |
| 123 | ret = inflate(&s->zstream, Z_FINISH); |
| 124 | if(ret != Z_STREAM_END || s->zstream.total_out != s->block_size) |
| 125 | return -1; |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 126 | |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 127 | s->current_block = block_num; |
| 128 | } |
| 129 | return 0; |
| 130 | } |
| 131 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 132 | static int cloop_read(BlockDriverState *bs, int64_t sector_num, |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 133 | uint8_t *buf, int nb_sectors) |
| 134 | { |
| 135 | BDRVCloopState *s = bs->opaque; |
| 136 | int i; |
| 137 | |
| 138 | for(i=0;i<nb_sectors;i++) { |
| 139 | uint32_t sector_offset_in_block=((sector_num+i)%s->sectors_per_block), |
| 140 | block_num=(sector_num+i)/s->sectors_per_block; |
| 141 | if(cloop_read_block(s, block_num) != 0) |
| 142 | return -1; |
| 143 | memcpy(buf+i*512,s->uncompressed_block+sector_offset_in_block*512,512); |
| 144 | } |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | static void cloop_close(BlockDriverState *bs) |
| 149 | { |
| 150 | BDRVCloopState *s = bs->opaque; |
| 151 | close(s->fd); |
bellard | 585d0ed | 2004-12-12 11:24:44 +0000 | [diff] [blame] | 152 | if(s->n_blocks>0) |
| 153 | free(s->offsets); |
bellard | 3c56521 | 2004-09-29 21:29:14 +0000 | [diff] [blame] | 154 | free(s->compressed_block); |
| 155 | free(s->uncompressed_block); |
| 156 | inflateEnd(&s->zstream); |
| 157 | } |
| 158 | |
| 159 | BlockDriver bdrv_cloop = { |
| 160 | "cloop", |
| 161 | sizeof(BDRVCloopState), |
| 162 | cloop_probe, |
| 163 | cloop_open, |
| 164 | cloop_read, |
| 165 | NULL, |
| 166 | cloop_close, |
| 167 | }; |
| 168 | |
| 169 | |