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[qemu/hppa.git] / block-cloop.c
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1 /*
2 * QEMU Block driver for CLOOP images
4 * Copyright (c) 2004 Johannes E. Schindelin
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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.
24 #include "qemu-common.h"
25 #include "block_int.h"
26 #include <zlib.h>
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;
35 uint8_t *compressed_block;
36 uint8_t *uncompressed_block;
37 z_stream zstream;
38 } BDRVCloopState;
40 static int cloop_probe(const uint8_t *buf, int buf_size, const char *filename)
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;
53 static int cloop_open(BlockDriverState *bs, const char *filename, int flags)
55 BDRVCloopState *s = bs->opaque;
56 uint32_t offsets_size,max_compressed_block_size=1,i;
58 s->fd = open(filename, O_RDONLY | O_BINARY);
59 if (s->fd < 0)
60 return -errno;
61 bs->read_only = 1;
63 /* read header */
64 if(lseek(s->fd,128,SEEK_SET)<0) {
65 cloop_close:
66 close(s->fd);
67 return -1;
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);
76 /* read offsets */
77 offsets_size=s->n_blocks*sizeof(uint64_t);
78 s->offsets=(uint64_t*)qemu_malloc(offsets_size);
79 if(read(s->fd,s->offsets,offsets_size)<offsets_size)
80 goto cloop_close;
81 for(i=0;i<s->n_blocks;i++) {
82 s->offsets[i]=be64_to_cpu(s->offsets[i]);
83 if(i>0) {
84 uint32_t size=s->offsets[i]-s->offsets[i-1];
85 if(size>max_compressed_block_size)
86 max_compressed_block_size=size;
90 /* initialize zlib engine */
91 s->compressed_block = qemu_malloc(max_compressed_block_size+1);
92 s->uncompressed_block = qemu_malloc(s->block_size);
93 if(inflateInit(&s->zstream) != Z_OK)
94 goto cloop_close;
95 s->current_block=s->n_blocks;
97 s->sectors_per_block = s->block_size/512;
98 bs->total_sectors = s->n_blocks*s->sectors_per_block;
99 return 0;
102 static inline int cloop_read_block(BDRVCloopState *s,int block_num)
104 if(s->current_block != block_num) {
105 int ret;
106 uint32_t bytes = s->offsets[block_num+1]-s->offsets[block_num];
108 lseek(s->fd, s->offsets[block_num], SEEK_SET);
109 ret = read(s->fd, s->compressed_block, bytes);
110 if (ret != bytes)
111 return -1;
113 s->zstream.next_in = s->compressed_block;
114 s->zstream.avail_in = bytes;
115 s->zstream.next_out = s->uncompressed_block;
116 s->zstream.avail_out = s->block_size;
117 ret = inflateReset(&s->zstream);
118 if(ret != Z_OK)
119 return -1;
120 ret = inflate(&s->zstream, Z_FINISH);
121 if(ret != Z_STREAM_END || s->zstream.total_out != s->block_size)
122 return -1;
124 s->current_block = block_num;
126 return 0;
129 static int cloop_read(BlockDriverState *bs, int64_t sector_num,
130 uint8_t *buf, int nb_sectors)
132 BDRVCloopState *s = bs->opaque;
133 int i;
135 for(i=0;i<nb_sectors;i++) {
136 uint32_t sector_offset_in_block=((sector_num+i)%s->sectors_per_block),
137 block_num=(sector_num+i)/s->sectors_per_block;
138 if(cloop_read_block(s, block_num) != 0)
139 return -1;
140 memcpy(buf+i*512,s->uncompressed_block+sector_offset_in_block*512,512);
142 return 0;
145 static void cloop_close(BlockDriverState *bs)
147 BDRVCloopState *s = bs->opaque;
148 close(s->fd);
149 if(s->n_blocks>0)
150 free(s->offsets);
151 free(s->compressed_block);
152 free(s->uncompressed_block);
153 inflateEnd(&s->zstream);
156 BlockDriver bdrv_cloop = {
157 .format_name = "cloop",
158 .instance_size = sizeof(BDRVCloopState),
159 .bdrv_probe = cloop_probe,
160 .bdrv_open = cloop_open,
161 .bdrv_read = cloop_read,
162 .bdrv_close = cloop_close,