ia64/xen-unstable

view tools/ioemu/block-dmg.c @ 15841:c5f735271e22

[IA64] Foreign p2m: Fix vti domain builder.

It should set arch_domain::convmem_end.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Alex Williamson <alex.williamson@hp.com>
date Thu Sep 06 13:48:43 2007 -0600 (2007-09-06)
parents 00618037d37d
children
line source
1 /*
2 * QEMU Block driver for DMG images
3 *
4 * Copyright (c) 2004 Johannes E. Schindelin
5 *
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 */
24 #include "vl.h"
25 #include "block_int.h"
26 #include "bswap.h"
27 #include <zlib.h>
29 typedef struct BDRVDMGState {
30 int fd;
32 /* each chunk contains a certain number of sectors,
33 * offsets[i] is the offset in the .dmg file,
34 * lengths[i] is the length of the compressed chunk,
35 * sectors[i] is the sector beginning at offsets[i],
36 * sectorcounts[i] is the number of sectors in that chunk,
37 * the sectors array is ordered
38 * 0<=i<n_chunks */
40 uint32_t n_chunks;
41 uint32_t* types;
42 uint64_t* offsets;
43 uint64_t* lengths;
44 uint64_t* sectors;
45 uint64_t* sectorcounts;
46 uint32_t current_chunk;
47 uint8_t *compressed_chunk;
48 uint8_t *uncompressed_chunk;
49 z_stream zstream;
50 } BDRVDMGState;
52 static int dmg_probe(const uint8_t *buf, int buf_size, const char *filename)
53 {
54 int len=strlen(filename);
55 if(len>4 && !strcmp(filename+len-4,".dmg"))
56 return 2;
57 return 0;
58 }
60 static off_t read_off(int fd)
61 {
62 uint64_t buffer;
63 if(read(fd,&buffer,8)<8)
64 return 0;
65 return be64_to_cpu(buffer);
66 }
68 static off_t read_uint32(int fd)
69 {
70 uint32_t buffer;
71 if(read(fd,&buffer,4)<4)
72 return 0;
73 return be32_to_cpu(buffer);
74 }
76 static int dmg_open(BlockDriverState *bs, const char *filename, int flags)
77 {
78 BDRVDMGState *s = bs->opaque;
79 off_t info_begin,info_end,last_in_offset,last_out_offset;
80 uint32_t count;
81 uint32_t max_compressed_size=1,max_sectors_per_chunk=1,i;
83 s->fd = open(filename, O_RDONLY | O_BINARY);
84 if (s->fd < 0)
85 return -errno;
86 bs->read_only = 1;
87 s->n_chunks = 0;
88 s->offsets = s->lengths = s->sectors = s->sectorcounts = 0;
90 /* read offset of info blocks */
91 if(lseek(s->fd,-0x1d8,SEEK_END)<0) {
92 dmg_close:
93 close(s->fd);
94 /* open raw instead */
95 bs->drv=&bdrv_raw;
96 return bs->drv->bdrv_open(bs, filename, flags);
97 }
98 info_begin=read_off(s->fd);
99 if(info_begin==0)
100 goto dmg_close;
101 if(lseek(s->fd,info_begin,SEEK_SET)<0)
102 goto dmg_close;
103 if(read_uint32(s->fd)!=0x100)
104 goto dmg_close;
105 if((count = read_uint32(s->fd))==0)
106 goto dmg_close;
107 info_end = info_begin+count;
108 if(lseek(s->fd,0xf8,SEEK_CUR)<0)
109 goto dmg_close;
111 /* read offsets */
112 last_in_offset = last_out_offset = 0;
113 while(lseek(s->fd,0,SEEK_CUR)<info_end) {
114 uint32_t type;
116 count = read_uint32(s->fd);
117 if(count==0)
118 goto dmg_close;
119 type = read_uint32(s->fd);
120 if(type!=0x6d697368 || count<244)
121 lseek(s->fd,count-4,SEEK_CUR);
122 else {
123 int new_size, chunk_count;
124 if(lseek(s->fd,200,SEEK_CUR)<0)
125 goto dmg_close;
126 chunk_count = (count-204)/40;
127 new_size = sizeof(uint64_t) * (s->n_chunks + chunk_count);
128 s->types = realloc(s->types, new_size/2);
129 s->offsets = realloc(s->offsets, new_size);
130 s->lengths = realloc(s->lengths, new_size);
131 s->sectors = realloc(s->sectors, new_size);
132 s->sectorcounts = realloc(s->sectorcounts, new_size);
134 for(i=s->n_chunks;i<s->n_chunks+chunk_count;i++) {
135 s->types[i] = read_uint32(s->fd);
136 if(s->types[i]!=0x80000005 && s->types[i]!=1 && s->types[i]!=2) {
137 if(s->types[i]==0xffffffff) {
138 last_in_offset = s->offsets[i-1]+s->lengths[i-1];
139 last_out_offset = s->sectors[i-1]+s->sectorcounts[i-1];
140 }
141 chunk_count--;
142 i--;
143 if(lseek(s->fd,36,SEEK_CUR)<0)
144 goto dmg_close;
145 continue;
146 }
147 read_uint32(s->fd);
148 s->sectors[i] = last_out_offset+read_off(s->fd);
149 s->sectorcounts[i] = read_off(s->fd);
150 s->offsets[i] = last_in_offset+read_off(s->fd);
151 s->lengths[i] = read_off(s->fd);
152 if(s->lengths[i]>max_compressed_size)
153 max_compressed_size = s->lengths[i];
154 if(s->sectorcounts[i]>max_sectors_per_chunk)
155 max_sectors_per_chunk = s->sectorcounts[i];
156 }
157 s->n_chunks+=chunk_count;
158 }
159 }
161 /* initialize zlib engine */
162 if(!(s->compressed_chunk = malloc(max_compressed_size+1)))
163 goto dmg_close;
164 if(!(s->uncompressed_chunk = malloc(512*max_sectors_per_chunk)))
165 goto dmg_close;
166 if(inflateInit(&s->zstream) != Z_OK)
167 goto dmg_close;
169 s->current_chunk = s->n_chunks;
171 return 0;
172 }
174 static inline int is_sector_in_chunk(BDRVDMGState* s,
175 uint32_t chunk_num,int sector_num)
176 {
177 if(chunk_num>=s->n_chunks || s->sectors[chunk_num]>sector_num ||
178 s->sectors[chunk_num]+s->sectorcounts[chunk_num]<=sector_num)
179 return 0;
180 else
181 return -1;
182 }
184 static inline uint32_t search_chunk(BDRVDMGState* s,int sector_num)
185 {
186 /* binary search */
187 uint32_t chunk1=0,chunk2=s->n_chunks,chunk3;
188 while(chunk1!=chunk2) {
189 chunk3 = (chunk1+chunk2)/2;
190 if(s->sectors[chunk3]>sector_num)
191 chunk2 = chunk3;
192 else if(s->sectors[chunk3]+s->sectorcounts[chunk3]>sector_num)
193 return chunk3;
194 else
195 chunk1 = chunk3;
196 }
197 return s->n_chunks; /* error */
198 }
200 static inline int dmg_read_chunk(BDRVDMGState *s,int sector_num)
201 {
202 if(!is_sector_in_chunk(s,s->current_chunk,sector_num)) {
203 int ret;
204 uint32_t chunk = search_chunk(s,sector_num);
206 if(chunk>=s->n_chunks)
207 return -1;
209 s->current_chunk = s->n_chunks;
210 switch(s->types[chunk]) {
211 case 0x80000005: { /* zlib compressed */
212 int i;
214 ret = lseek(s->fd, s->offsets[chunk], SEEK_SET);
215 if(ret<0)
216 return -1;
218 /* we need to buffer, because only the chunk as whole can be
219 * inflated. */
220 i=0;
221 do {
222 ret = read(s->fd, s->compressed_chunk+i, s->lengths[chunk]-i);
223 if(ret<0 && errno==EINTR)
224 ret=0;
225 i+=ret;
226 } while(ret>=0 && ret+i<s->lengths[chunk]);
228 if (ret != s->lengths[chunk])
229 return -1;
231 s->zstream.next_in = s->compressed_chunk;
232 s->zstream.avail_in = s->lengths[chunk];
233 s->zstream.next_out = s->uncompressed_chunk;
234 s->zstream.avail_out = 512*s->sectorcounts[chunk];
235 ret = inflateReset(&s->zstream);
236 if(ret != Z_OK)
237 return -1;
238 ret = inflate(&s->zstream, Z_FINISH);
239 if(ret != Z_STREAM_END || s->zstream.total_out != 512*s->sectorcounts[chunk])
240 return -1;
241 break; }
242 case 1: /* copy */
243 ret = read(s->fd, s->uncompressed_chunk, s->lengths[chunk]);
244 if (ret != s->lengths[chunk])
245 return -1;
246 break;
247 case 2: /* zero */
248 memset(s->uncompressed_chunk, 0, 512*s->sectorcounts[chunk]);
249 break;
250 }
251 s->current_chunk = chunk;
252 }
253 return 0;
254 }
256 static int dmg_read(BlockDriverState *bs, int64_t sector_num,
257 uint8_t *buf, int nb_sectors)
258 {
259 BDRVDMGState *s = bs->opaque;
260 int i;
262 for(i=0;i<nb_sectors;i++) {
263 uint32_t sector_offset_in_chunk;
264 if(dmg_read_chunk(s, sector_num+i) != 0)
265 return -1;
266 sector_offset_in_chunk = sector_num+i-s->sectors[s->current_chunk];
267 memcpy(buf+i*512,s->uncompressed_chunk+sector_offset_in_chunk*512,512);
268 }
269 return 0;
270 }
272 static void dmg_close(BlockDriverState *bs)
273 {
274 BDRVDMGState *s = bs->opaque;
275 close(s->fd);
276 if(s->n_chunks>0) {
277 free(s->types);
278 free(s->offsets);
279 free(s->lengths);
280 free(s->sectors);
281 free(s->sectorcounts);
282 }
283 free(s->compressed_chunk);
284 free(s->uncompressed_chunk);
285 inflateEnd(&s->zstream);
286 }
288 BlockDriver bdrv_dmg = {
289 "dmg",
290 sizeof(BDRVDMGState),
291 dmg_probe,
292 dmg_open,
293 dmg_read,
294 NULL,
295 dmg_close,
296 };