root / block-vvfat.c @ 64eaabda
History | View | Annotate | Download (79.1 kB)
| 1 |
/* vim:set shiftwidth=4 ts=8: */
|
|---|---|
| 2 |
/*
|
| 3 |
* QEMU Block driver for virtual VFAT (shadows a local directory)
|
| 4 |
*
|
| 5 |
* Copyright (c) 2004,2005 Johannes E. Schindelin
|
| 6 |
*
|
| 7 |
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
| 8 |
* of this software and associated documentation files (the "Software"), to deal
|
| 9 |
* in the Software without restriction, including without limitation the rights
|
| 10 |
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
| 11 |
* copies of the Software, and to permit persons to whom the Software is
|
| 12 |
* furnished to do so, subject to the following conditions:
|
| 13 |
*
|
| 14 |
* The above copyright notice and this permission notice shall be included in
|
| 15 |
* all copies or substantial portions of the Software.
|
| 16 |
*
|
| 17 |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
| 18 |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
| 19 |
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
| 20 |
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
| 21 |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
| 22 |
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
| 23 |
* THE SOFTWARE.
|
| 24 |
*/
|
| 25 |
#include <sys/stat.h> |
| 26 |
#include <dirent.h> |
| 27 |
#include <assert.h> |
| 28 |
#include "qemu-common.h" |
| 29 |
#include "block_int.h" |
| 30 |
|
| 31 |
#ifndef S_IWGRP
|
| 32 |
#define S_IWGRP 0 |
| 33 |
#endif
|
| 34 |
#ifndef S_IWOTH
|
| 35 |
#define S_IWOTH 0 |
| 36 |
#endif
|
| 37 |
|
| 38 |
/* TODO: add ":bootsector=blabla.img:" */
|
| 39 |
/* LATER TODO: add automatic boot sector generation from
|
| 40 |
BOOTEASY.ASM and Ranish Partition Manager
|
| 41 |
Note that DOS assumes the system files to be the first files in the
|
| 42 |
file system (test if the boot sector still relies on that fact)! */
|
| 43 |
/* MAYBE TODO: write block-visofs.c */
|
| 44 |
/* TODO: call try_commit() only after a timeout */
|
| 45 |
|
| 46 |
/* #define DEBUG */
|
| 47 |
|
| 48 |
#ifdef DEBUG
|
| 49 |
|
| 50 |
#define DLOG(a) a
|
| 51 |
|
| 52 |
#undef stderr
|
| 53 |
#define stderr STDERR
|
| 54 |
FILE* stderr = NULL;
|
| 55 |
|
| 56 |
static void checkpoint(void); |
| 57 |
|
| 58 |
#ifdef __MINGW32__
|
| 59 |
void nonono(const char* file, int line, const char* msg) { |
| 60 |
fprintf(stderr, "Nonono! %s:%d %s\n", file, line, msg);
|
| 61 |
exit(-5);
|
| 62 |
} |
| 63 |
#undef assert
|
| 64 |
#define assert(a) do {if (!(a)) nonono(__FILE__, __LINE__, #a);}while(0) |
| 65 |
#endif
|
| 66 |
|
| 67 |
#else
|
| 68 |
|
| 69 |
#define DLOG(a)
|
| 70 |
|
| 71 |
#endif
|
| 72 |
|
| 73 |
/* dynamic array functions */
|
| 74 |
typedef struct array_t { |
| 75 |
char* pointer;
|
| 76 |
unsigned int size,next,item_size; |
| 77 |
} array_t; |
| 78 |
|
| 79 |
static inline void array_init(array_t* array,unsigned int item_size) |
| 80 |
{
|
| 81 |
array->pointer=0;
|
| 82 |
array->size=0;
|
| 83 |
array->next=0;
|
| 84 |
array->item_size=item_size; |
| 85 |
} |
| 86 |
|
| 87 |
static inline void array_free(array_t* array) |
| 88 |
{
|
| 89 |
if(array->pointer)
|
| 90 |
free(array->pointer); |
| 91 |
array->size=array->next=0;
|
| 92 |
} |
| 93 |
|
| 94 |
/* does not automatically grow */
|
| 95 |
static inline void* array_get(array_t* array,unsigned int index) { |
| 96 |
assert(index >= 0);
|
| 97 |
assert(index < array->next); |
| 98 |
return array->pointer + index * array->item_size;
|
| 99 |
} |
| 100 |
|
| 101 |
static inline int array_ensure_allocated(array_t* array, int index) |
| 102 |
{
|
| 103 |
if((index + 1) * array->item_size > array->size) { |
| 104 |
int new_size = (index + 32) * array->item_size; |
| 105 |
array->pointer = realloc(array->pointer, new_size); |
| 106 |
if (!array->pointer)
|
| 107 |
return -1; |
| 108 |
array->size = new_size; |
| 109 |
array->next = index + 1;
|
| 110 |
} |
| 111 |
|
| 112 |
return 0; |
| 113 |
} |
| 114 |
|
| 115 |
static inline void* array_get_next(array_t* array) { |
| 116 |
unsigned int next = array->next; |
| 117 |
void* result;
|
| 118 |
|
| 119 |
if (array_ensure_allocated(array, next) < 0) |
| 120 |
return NULL; |
| 121 |
|
| 122 |
array->next = next + 1;
|
| 123 |
result = array_get(array, next); |
| 124 |
|
| 125 |
return result;
|
| 126 |
} |
| 127 |
|
| 128 |
static inline void* array_insert(array_t* array,unsigned int index,unsigned int count) { |
| 129 |
if((array->next+count)*array->item_size>array->size) {
|
| 130 |
int increment=count*array->item_size;
|
| 131 |
array->pointer=realloc(array->pointer,array->size+increment); |
| 132 |
if(!array->pointer)
|
| 133 |
return 0; |
| 134 |
array->size+=increment; |
| 135 |
} |
| 136 |
memmove(array->pointer+(index+count)*array->item_size, |
| 137 |
array->pointer+index*array->item_size, |
| 138 |
(array->next-index)*array->item_size); |
| 139 |
array->next+=count; |
| 140 |
return array->pointer+index*array->item_size;
|
| 141 |
} |
| 142 |
|
| 143 |
/* this performs a "roll", so that the element which was at index_from becomes
|
| 144 |
* index_to, but the order of all other elements is preserved. */
|
| 145 |
static inline int array_roll(array_t* array,int index_to,int index_from,int count) |
| 146 |
{
|
| 147 |
char* buf;
|
| 148 |
char* from;
|
| 149 |
char* to;
|
| 150 |
int is;
|
| 151 |
|
| 152 |
if(!array ||
|
| 153 |
index_to<0 || index_to>=array->next ||
|
| 154 |
index_from<0 || index_from>=array->next)
|
| 155 |
return -1; |
| 156 |
|
| 157 |
if(index_to==index_from)
|
| 158 |
return 0; |
| 159 |
|
| 160 |
is=array->item_size; |
| 161 |
from=array->pointer+index_from*is; |
| 162 |
to=array->pointer+index_to*is; |
| 163 |
buf=malloc(is*count); |
| 164 |
memcpy(buf,from,is*count); |
| 165 |
|
| 166 |
if(index_to<index_from)
|
| 167 |
memmove(to+is*count,to,from-to); |
| 168 |
else
|
| 169 |
memmove(from,from+is*count,to-from); |
| 170 |
|
| 171 |
memcpy(to,buf,is*count); |
| 172 |
|
| 173 |
free(buf); |
| 174 |
|
| 175 |
return 0; |
| 176 |
} |
| 177 |
|
| 178 |
static inline int array_remove_slice(array_t* array,int index, int count) |
| 179 |
{
|
| 180 |
assert(index >=0);
|
| 181 |
assert(count > 0);
|
| 182 |
assert(index + count <= array->next); |
| 183 |
if(array_roll(array,array->next-1,index,count)) |
| 184 |
return -1; |
| 185 |
array->next -= count; |
| 186 |
return 0; |
| 187 |
} |
| 188 |
|
| 189 |
static int array_remove(array_t* array,int index) |
| 190 |
{
|
| 191 |
return array_remove_slice(array, index, 1); |
| 192 |
} |
| 193 |
|
| 194 |
/* return the index for a given member */
|
| 195 |
static int array_index(array_t* array, void* pointer) |
| 196 |
{
|
| 197 |
size_t offset = (char*)pointer - array->pointer;
|
| 198 |
assert(offset >= 0);
|
| 199 |
assert((offset % array->item_size) == 0);
|
| 200 |
assert(offset/array->item_size < array->next); |
| 201 |
return offset/array->item_size;
|
| 202 |
} |
| 203 |
|
| 204 |
/* These structures are used to fake a disk and the VFAT filesystem.
|
| 205 |
* For this reason we need to use __attribute__((packed)). */
|
| 206 |
|
| 207 |
typedef struct bootsector_t { |
| 208 |
uint8_t jump[3];
|
| 209 |
uint8_t name[8];
|
| 210 |
uint16_t sector_size; |
| 211 |
uint8_t sectors_per_cluster; |
| 212 |
uint16_t reserved_sectors; |
| 213 |
uint8_t number_of_fats; |
| 214 |
uint16_t root_entries; |
| 215 |
uint16_t total_sectors16; |
| 216 |
uint8_t media_type; |
| 217 |
uint16_t sectors_per_fat; |
| 218 |
uint16_t sectors_per_track; |
| 219 |
uint16_t number_of_heads; |
| 220 |
uint32_t hidden_sectors; |
| 221 |
uint32_t total_sectors; |
| 222 |
union {
|
| 223 |
struct {
|
| 224 |
uint8_t drive_number; |
| 225 |
uint8_t current_head; |
| 226 |
uint8_t signature; |
| 227 |
uint32_t id; |
| 228 |
uint8_t volume_label[11];
|
| 229 |
} __attribute__((packed)) fat16; |
| 230 |
struct {
|
| 231 |
uint32_t sectors_per_fat; |
| 232 |
uint16_t flags; |
| 233 |
uint8_t major,minor; |
| 234 |
uint32_t first_cluster_of_root_directory; |
| 235 |
uint16_t info_sector; |
| 236 |
uint16_t backup_boot_sector; |
| 237 |
uint16_t ignored; |
| 238 |
} __attribute__((packed)) fat32; |
| 239 |
} u; |
| 240 |
uint8_t fat_type[8];
|
| 241 |
uint8_t ignored[0x1c0];
|
| 242 |
uint8_t magic[2];
|
| 243 |
} __attribute__((packed)) bootsector_t; |
| 244 |
|
| 245 |
typedef struct { |
| 246 |
uint8_t head; |
| 247 |
uint8_t sector; |
| 248 |
uint8_t cylinder; |
| 249 |
} mbr_chs_t; |
| 250 |
|
| 251 |
typedef struct partition_t { |
| 252 |
uint8_t attributes; /* 0x80 = bootable */
|
| 253 |
mbr_chs_t start_CHS; |
| 254 |
uint8_t fs_type; /* 0x1 = FAT12, 0x6 = FAT16, 0xe = FAT16_LBA, 0xb = FAT32, 0xc = FAT32_LBA */
|
| 255 |
mbr_chs_t end_CHS; |
| 256 |
uint32_t start_sector_long; |
| 257 |
uint32_t length_sector_long; |
| 258 |
} __attribute__((packed)) partition_t; |
| 259 |
|
| 260 |
typedef struct mbr_t { |
| 261 |
uint8_t ignored[0x1b8];
|
| 262 |
uint32_t nt_id; |
| 263 |
uint8_t ignored2[2];
|
| 264 |
partition_t partition[4];
|
| 265 |
uint8_t magic[2];
|
| 266 |
} __attribute__((packed)) mbr_t; |
| 267 |
|
| 268 |
typedef struct direntry_t { |
| 269 |
uint8_t name[8];
|
| 270 |
uint8_t extension[3];
|
| 271 |
uint8_t attributes; |
| 272 |
uint8_t reserved[2];
|
| 273 |
uint16_t ctime; |
| 274 |
uint16_t cdate; |
| 275 |
uint16_t adate; |
| 276 |
uint16_t begin_hi; |
| 277 |
uint16_t mtime; |
| 278 |
uint16_t mdate; |
| 279 |
uint16_t begin; |
| 280 |
uint32_t size; |
| 281 |
} __attribute__((packed)) direntry_t; |
| 282 |
|
| 283 |
/* this structure are used to transparently access the files */
|
| 284 |
|
| 285 |
typedef struct mapping_t { |
| 286 |
/* begin is the first cluster, end is the last+1 */
|
| 287 |
uint32_t begin,end; |
| 288 |
/* as s->directory is growable, no pointer may be used here */
|
| 289 |
unsigned int dir_index; |
| 290 |
/* the clusters of a file may be in any order; this points to the first */
|
| 291 |
int first_mapping_index;
|
| 292 |
union {
|
| 293 |
/* offset is
|
| 294 |
* - the offset in the file (in clusters) for a file, or
|
| 295 |
* - the next cluster of the directory for a directory, and
|
| 296 |
* - the address of the buffer for a faked entry
|
| 297 |
*/
|
| 298 |
struct {
|
| 299 |
uint32_t offset; |
| 300 |
} file; |
| 301 |
struct {
|
| 302 |
int parent_mapping_index;
|
| 303 |
int first_dir_index;
|
| 304 |
} dir; |
| 305 |
} info; |
| 306 |
/* path contains the full path, i.e. it always starts with s->path */
|
| 307 |
char* path;
|
| 308 |
|
| 309 |
enum { MODE_UNDEFINED = 0, MODE_NORMAL = 1, MODE_MODIFIED = 2, |
| 310 |
MODE_DIRECTORY = 4, MODE_FAKED = 8, |
| 311 |
MODE_DELETED = 16, MODE_RENAMED = 32 } mode; |
| 312 |
int read_only;
|
| 313 |
} mapping_t; |
| 314 |
|
| 315 |
#ifdef DEBUG
|
| 316 |
static void print_direntry(const struct direntry_t*); |
| 317 |
static void print_mapping(const struct mapping_t* mapping); |
| 318 |
#endif
|
| 319 |
|
| 320 |
/* here begins the real VVFAT driver */
|
| 321 |
|
| 322 |
typedef struct BDRVVVFATState { |
| 323 |
BlockDriverState* bs; /* pointer to parent */
|
| 324 |
unsigned int first_sectors_number; /* 1 for a single partition, 0x40 for a disk with partition table */ |
| 325 |
unsigned char first_sectors[0x40*0x200]; |
| 326 |
|
| 327 |
int fat_type; /* 16 or 32 */ |
| 328 |
array_t fat,directory,mapping; |
| 329 |
|
| 330 |
unsigned int cluster_size; |
| 331 |
unsigned int sectors_per_cluster; |
| 332 |
unsigned int sectors_per_fat; |
| 333 |
unsigned int sectors_of_root_directory; |
| 334 |
uint32_t last_cluster_of_root_directory; |
| 335 |
unsigned int faked_sectors; /* how many sectors are faked before file data */ |
| 336 |
uint32_t sector_count; /* total number of sectors of the partition */
|
| 337 |
uint32_t cluster_count; /* total number of clusters of this partition */
|
| 338 |
uint32_t max_fat_value; |
| 339 |
|
| 340 |
int current_fd;
|
| 341 |
mapping_t* current_mapping; |
| 342 |
unsigned char* cluster; /* points to current cluster */ |
| 343 |
unsigned char* cluster_buffer; /* points to a buffer to hold temp data */ |
| 344 |
unsigned int current_cluster; |
| 345 |
|
| 346 |
/* write support */
|
| 347 |
BlockDriverState* write_target; |
| 348 |
char* qcow_filename;
|
| 349 |
BlockDriverState* qcow; |
| 350 |
void* fat2;
|
| 351 |
char* used_clusters;
|
| 352 |
array_t commits; |
| 353 |
const char* path; |
| 354 |
int downcase_short_names;
|
| 355 |
} BDRVVVFATState; |
| 356 |
|
| 357 |
/* take the sector position spos and convert it to Cylinder/Head/Sector position
|
| 358 |
* if the position is outside the specified geometry, fill maximum value for CHS
|
| 359 |
* and return 1 to signal overflow.
|
| 360 |
*/
|
| 361 |
static int sector2CHS(BlockDriverState* bs, mbr_chs_t * chs, int spos){ |
| 362 |
int head,sector;
|
| 363 |
sector = spos % (bs->secs); spos/= bs->secs; |
| 364 |
head = spos % (bs->heads); spos/= bs->heads; |
| 365 |
if(spos >= bs->cyls){
|
| 366 |
/* Overflow,
|
| 367 |
it happens if 32bit sector positions are used, while CHS is only 24bit.
|
| 368 |
Windows/Dos is said to take 1023/255/63 as nonrepresentable CHS */
|
| 369 |
chs->head = 0xFF;
|
| 370 |
chs->sector = 0xFF;
|
| 371 |
chs->cylinder = 0xFF;
|
| 372 |
return 1; |
| 373 |
} |
| 374 |
chs->head = (uint8_t)head; |
| 375 |
chs->sector = (uint8_t)( (sector+1) | ((spos>>8)<<6) ); |
| 376 |
chs->cylinder = (uint8_t)spos; |
| 377 |
return 0; |
| 378 |
} |
| 379 |
|
| 380 |
static void init_mbr(BDRVVVFATState* s) |
| 381 |
{
|
| 382 |
/* TODO: if the files mbr.img and bootsect.img exist, use them */
|
| 383 |
mbr_t* real_mbr=(mbr_t*)s->first_sectors; |
| 384 |
partition_t* partition=&(real_mbr->partition[0]);
|
| 385 |
int lba;
|
| 386 |
|
| 387 |
memset(s->first_sectors,0,512); |
| 388 |
|
| 389 |
/* Win NT Disk Signature */
|
| 390 |
real_mbr->nt_id= cpu_to_le32(0xbe1afdfa);
|
| 391 |
|
| 392 |
partition->attributes=0x80; /* bootable */ |
| 393 |
|
| 394 |
/* LBA is used when partition is outside the CHS geometry */
|
| 395 |
lba = sector2CHS(s->bs, &partition->start_CHS, s->first_sectors_number-1);
|
| 396 |
lba|= sector2CHS(s->bs, &partition->end_CHS, s->sector_count); |
| 397 |
|
| 398 |
/*LBA partitions are identified only by start/length_sector_long not by CHS*/
|
| 399 |
partition->start_sector_long =cpu_to_le32(s->first_sectors_number-1);
|
| 400 |
partition->length_sector_long=cpu_to_le32(s->sector_count - s->first_sectors_number+1);
|
| 401 |
|
| 402 |
/* FAT12/FAT16/FAT32 */
|
| 403 |
/* DOS uses different types when partition is LBA,
|
| 404 |
probably to prevent older versions from using CHS on them */
|
| 405 |
partition->fs_type= s->fat_type==12 ? 0x1: |
| 406 |
s->fat_type==16 ? (lba?0xe:0x06): |
| 407 |
/*fat_tyoe==32*/ (lba?0xc:0x0b); |
| 408 |
|
| 409 |
real_mbr->magic[0]=0x55; real_mbr->magic[1]=0xaa; |
| 410 |
} |
| 411 |
|
| 412 |
/* direntry functions */
|
| 413 |
|
| 414 |
/* dest is assumed to hold 258 bytes, and pads with 0xffff up to next multiple of 26 */
|
| 415 |
static inline int short2long_name(char* dest,const char* src) |
| 416 |
{
|
| 417 |
int i;
|
| 418 |
int len;
|
| 419 |
for(i=0;i<129 && src[i];i++) { |
| 420 |
dest[2*i]=src[i];
|
| 421 |
dest[2*i+1]=0; |
| 422 |
} |
| 423 |
len=2*i;
|
| 424 |
dest[2*i]=dest[2*i+1]=0; |
| 425 |
for(i=2*i+2;(i%26);i++) |
| 426 |
dest[i]=0xff;
|
| 427 |
return len;
|
| 428 |
} |
| 429 |
|
| 430 |
static inline direntry_t* create_long_filename(BDRVVVFATState* s,const char* filename) |
| 431 |
{
|
| 432 |
char buffer[258]; |
| 433 |
int length=short2long_name(buffer,filename),
|
| 434 |
number_of_entries=(length+25)/26,i; |
| 435 |
direntry_t* entry; |
| 436 |
|
| 437 |
for(i=0;i<number_of_entries;i++) { |
| 438 |
entry=array_get_next(&(s->directory)); |
| 439 |
entry->attributes=0xf;
|
| 440 |
entry->reserved[0]=0; |
| 441 |
entry->begin=0;
|
| 442 |
entry->name[0]=(number_of_entries-i)|(i==0?0x40:0); |
| 443 |
} |
| 444 |
for(i=0;i<26*number_of_entries;i++) { |
| 445 |
int offset=(i%26); |
| 446 |
if(offset<10) offset=1+offset; |
| 447 |
else if(offset<22) offset=14+offset-10; |
| 448 |
else offset=28+offset-22; |
| 449 |
entry=array_get(&(s->directory),s->directory.next-1-(i/26)); |
| 450 |
entry->name[offset]=buffer[i]; |
| 451 |
} |
| 452 |
return array_get(&(s->directory),s->directory.next-number_of_entries);
|
| 453 |
} |
| 454 |
|
| 455 |
static char is_free(const direntry_t* direntry) |
| 456 |
{
|
| 457 |
return direntry->name[0]==0xe5 || direntry->name[0]==0x00; |
| 458 |
} |
| 459 |
|
| 460 |
static char is_volume_label(const direntry_t* direntry) |
| 461 |
{
|
| 462 |
return direntry->attributes == 0x28; |
| 463 |
} |
| 464 |
|
| 465 |
static char is_long_name(const direntry_t* direntry) |
| 466 |
{
|
| 467 |
return direntry->attributes == 0xf; |
| 468 |
} |
| 469 |
|
| 470 |
static char is_short_name(const direntry_t* direntry) |
| 471 |
{
|
| 472 |
return !is_volume_label(direntry) && !is_long_name(direntry)
|
| 473 |
&& !is_free(direntry); |
| 474 |
} |
| 475 |
|
| 476 |
static char is_directory(const direntry_t* direntry) |
| 477 |
{
|
| 478 |
return direntry->attributes & 0x10 && direntry->name[0] != 0xe5; |
| 479 |
} |
| 480 |
|
| 481 |
static inline char is_dot(const direntry_t* direntry) |
| 482 |
{
|
| 483 |
return is_short_name(direntry) && direntry->name[0] == '.'; |
| 484 |
} |
| 485 |
|
| 486 |
static char is_file(const direntry_t* direntry) |
| 487 |
{
|
| 488 |
return is_short_name(direntry) && !is_directory(direntry);
|
| 489 |
} |
| 490 |
|
| 491 |
static inline uint32_t begin_of_direntry(const direntry_t* direntry) |
| 492 |
{
|
| 493 |
return le16_to_cpu(direntry->begin)|(le16_to_cpu(direntry->begin_hi)<<16); |
| 494 |
} |
| 495 |
|
| 496 |
static inline uint32_t filesize_of_direntry(const direntry_t* direntry) |
| 497 |
{
|
| 498 |
return le32_to_cpu(direntry->size);
|
| 499 |
} |
| 500 |
|
| 501 |
static void set_begin_of_direntry(direntry_t* direntry, uint32_t begin) |
| 502 |
{
|
| 503 |
direntry->begin = cpu_to_le16(begin & 0xffff);
|
| 504 |
direntry->begin_hi = cpu_to_le16((begin >> 16) & 0xffff); |
| 505 |
} |
| 506 |
|
| 507 |
/* fat functions */
|
| 508 |
|
| 509 |
static inline uint8_t fat_chksum(const direntry_t* entry) |
| 510 |
{
|
| 511 |
uint8_t chksum=0;
|
| 512 |
int i;
|
| 513 |
|
| 514 |
for(i=0;i<11;i++) |
| 515 |
chksum=(((chksum&0xfe)>>1)|((chksum&0x01)?0x80:0)) |
| 516 |
+(unsigned char)entry->name[i]; |
| 517 |
|
| 518 |
return chksum;
|
| 519 |
} |
| 520 |
|
| 521 |
/* if return_time==0, this returns the fat_date, else the fat_time */
|
| 522 |
static uint16_t fat_datetime(time_t time,int return_time) { |
| 523 |
struct tm* t;
|
| 524 |
#ifdef _WIN32
|
| 525 |
t=localtime(&time); /* this is not thread safe */
|
| 526 |
#else
|
| 527 |
struct tm t1;
|
| 528 |
t=&t1; |
| 529 |
localtime_r(&time,t); |
| 530 |
#endif
|
| 531 |
if(return_time)
|
| 532 |
return cpu_to_le16((t->tm_sec/2)|(t->tm_min<<5)|(t->tm_hour<<11)); |
| 533 |
return cpu_to_le16((t->tm_mday)|((t->tm_mon+1)<<5)|((t->tm_year-80)<<9)); |
| 534 |
} |
| 535 |
|
| 536 |
static inline void fat_set(BDRVVVFATState* s,unsigned int cluster,uint32_t value) |
| 537 |
{
|
| 538 |
if(s->fat_type==32) { |
| 539 |
uint32_t* entry=array_get(&(s->fat),cluster); |
| 540 |
*entry=cpu_to_le32(value); |
| 541 |
} else if(s->fat_type==16) { |
| 542 |
uint16_t* entry=array_get(&(s->fat),cluster); |
| 543 |
*entry=cpu_to_le16(value&0xffff);
|
| 544 |
} else {
|
| 545 |
int offset = (cluster*3/2); |
| 546 |
unsigned char* p = array_get(&(s->fat), offset); |
| 547 |
switch (cluster&1) { |
| 548 |
case 0: |
| 549 |
p[0] = value&0xff; |
| 550 |
p[1] = (p[1]&0xf0) | ((value>>8)&0xf); |
| 551 |
break;
|
| 552 |
case 1: |
| 553 |
p[0] = (p[0]&0xf) | ((value&0xf)<<4); |
| 554 |
p[1] = (value>>4); |
| 555 |
break;
|
| 556 |
} |
| 557 |
} |
| 558 |
} |
| 559 |
|
| 560 |
static inline uint32_t fat_get(BDRVVVFATState* s,unsigned int cluster) |
| 561 |
{
|
| 562 |
if(s->fat_type==32) { |
| 563 |
uint32_t* entry=array_get(&(s->fat),cluster); |
| 564 |
return le32_to_cpu(*entry);
|
| 565 |
} else if(s->fat_type==16) { |
| 566 |
uint16_t* entry=array_get(&(s->fat),cluster); |
| 567 |
return le16_to_cpu(*entry);
|
| 568 |
} else {
|
| 569 |
const uint8_t* x=(uint8_t*)(s->fat.pointer)+cluster*3/2; |
| 570 |
return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff; |
| 571 |
} |
| 572 |
} |
| 573 |
|
| 574 |
static inline int fat_eof(BDRVVVFATState* s,uint32_t fat_entry) |
| 575 |
{
|
| 576 |
if(fat_entry>s->max_fat_value-8) |
| 577 |
return -1; |
| 578 |
return 0; |
| 579 |
} |
| 580 |
|
| 581 |
static inline void init_fat(BDRVVVFATState* s) |
| 582 |
{
|
| 583 |
if (s->fat_type == 12) { |
| 584 |
array_init(&(s->fat),1);
|
| 585 |
array_ensure_allocated(&(s->fat), |
| 586 |
s->sectors_per_fat * 0x200 * 3 / 2 - 1); |
| 587 |
} else {
|
| 588 |
array_init(&(s->fat),(s->fat_type==32?4:2)); |
| 589 |
array_ensure_allocated(&(s->fat), |
| 590 |
s->sectors_per_fat * 0x200 / s->fat.item_size - 1); |
| 591 |
} |
| 592 |
memset(s->fat.pointer,0,s->fat.size);
|
| 593 |
|
| 594 |
switch(s->fat_type) {
|
| 595 |
case 12: s->max_fat_value=0xfff; break; |
| 596 |
case 16: s->max_fat_value=0xffff; break; |
| 597 |
case 32: s->max_fat_value=0x0fffffff; break; |
| 598 |
default: s->max_fat_value=0; /* error... */ |
| 599 |
} |
| 600 |
|
| 601 |
} |
| 602 |
|
| 603 |
/* TODO: in create_short_filename, 0xe5->0x05 is not yet handled! */
|
| 604 |
/* TODO: in parse_short_filename, 0x05->0xe5 is not yet handled! */
|
| 605 |
static inline direntry_t* create_short_and_long_name(BDRVVVFATState* s, |
| 606 |
unsigned int directory_start, const char* filename, int is_dot) |
| 607 |
{
|
| 608 |
int i,j,long_index=s->directory.next;
|
| 609 |
direntry_t* entry=0;
|
| 610 |
direntry_t* entry_long=0;
|
| 611 |
|
| 612 |
if(is_dot) {
|
| 613 |
entry=array_get_next(&(s->directory)); |
| 614 |
memset(entry->name,0x20,11); |
| 615 |
memcpy(entry->name,filename,strlen(filename)); |
| 616 |
return entry;
|
| 617 |
} |
| 618 |
|
| 619 |
entry_long=create_long_filename(s,filename); |
| 620 |
|
| 621 |
i = strlen(filename); |
| 622 |
for(j = i - 1; j>0 && filename[j]!='.';j--); |
| 623 |
if (j > 0) |
| 624 |
i = (j > 8 ? 8 : j); |
| 625 |
else if (i > 8) |
| 626 |
i = 8;
|
| 627 |
|
| 628 |
entry=array_get_next(&(s->directory)); |
| 629 |
memset(entry->name,0x20,11); |
| 630 |
strncpy((char*)entry->name,filename,i);
|
| 631 |
|
| 632 |
if(j > 0) |
| 633 |
for (i = 0; i < 3 && filename[j+1+i]; i++) |
| 634 |
entry->extension[i] = filename[j+1+i];
|
| 635 |
|
| 636 |
/* upcase & remove unwanted characters */
|
| 637 |
for(i=10;i>=0;i--) { |
| 638 |
if(i==10 || i==7) for(;i>0 && entry->name[i]==' ';i--); |
| 639 |
if(entry->name[i]<=' ' || entry->name[i]>0x7f |
| 640 |
|| strchr(".*?<>|\":/\\[];,+='",entry->name[i]))
|
| 641 |
entry->name[i]='_';
|
| 642 |
else if(entry->name[i]>='a' && entry->name[i]<='z') |
| 643 |
entry->name[i]+='A'-'a'; |
| 644 |
} |
| 645 |
|
| 646 |
/* mangle duplicates */
|
| 647 |
while(1) { |
| 648 |
direntry_t* entry1=array_get(&(s->directory),directory_start); |
| 649 |
int j;
|
| 650 |
|
| 651 |
for(;entry1<entry;entry1++)
|
| 652 |
if(!is_long_name(entry1) && !memcmp(entry1->name,entry->name,11)) |
| 653 |
break; /* found dupe */ |
| 654 |
if(entry1==entry) /* no dupe found */ |
| 655 |
break;
|
| 656 |
|
| 657 |
/* use all 8 characters of name */
|
| 658 |
if(entry->name[7]==' ') { |
| 659 |
int j;
|
| 660 |
for(j=6;j>0 && entry->name[j]==' ';j--) |
| 661 |
entry->name[j]='~';
|
| 662 |
} |
| 663 |
|
| 664 |
/* increment number */
|
| 665 |
for(j=7;j>0 && entry->name[j]=='9';j--) |
| 666 |
entry->name[j]='0';
|
| 667 |
if(j>0) { |
| 668 |
if(entry->name[j]<'0' || entry->name[j]>'9') |
| 669 |
entry->name[j]='0';
|
| 670 |
else
|
| 671 |
entry->name[j]++; |
| 672 |
} |
| 673 |
} |
| 674 |
|
| 675 |
/* calculate checksum; propagate to long name */
|
| 676 |
if(entry_long) {
|
| 677 |
uint8_t chksum=fat_chksum(entry); |
| 678 |
|
| 679 |
/* calculate anew, because realloc could have taken place */
|
| 680 |
entry_long=array_get(&(s->directory),long_index); |
| 681 |
while(entry_long<entry && is_long_name(entry_long)) {
|
| 682 |
entry_long->reserved[1]=chksum;
|
| 683 |
entry_long++; |
| 684 |
} |
| 685 |
} |
| 686 |
|
| 687 |
return entry;
|
| 688 |
} |
| 689 |
|
| 690 |
/*
|
| 691 |
* Read a directory. (the index of the corresponding mapping must be passed).
|
| 692 |
*/
|
| 693 |
static int read_directory(BDRVVVFATState* s, int mapping_index) |
| 694 |
{
|
| 695 |
mapping_t* mapping = array_get(&(s->mapping), mapping_index); |
| 696 |
direntry_t* direntry; |
| 697 |
const char* dirname = mapping->path; |
| 698 |
int first_cluster = mapping->begin;
|
| 699 |
int parent_index = mapping->info.dir.parent_mapping_index;
|
| 700 |
mapping_t* parent_mapping = (mapping_t*) |
| 701 |
(parent_index >= 0 ? array_get(&(s->mapping), parent_index) : 0); |
| 702 |
int first_cluster_of_parent = parent_mapping ? parent_mapping->begin : -1; |
| 703 |
|
| 704 |
DIR* dir=opendir(dirname); |
| 705 |
struct dirent* entry;
|
| 706 |
int i;
|
| 707 |
|
| 708 |
assert(mapping->mode & MODE_DIRECTORY); |
| 709 |
|
| 710 |
if(!dir) {
|
| 711 |
mapping->end = mapping->begin; |
| 712 |
return -1; |
| 713 |
} |
| 714 |
|
| 715 |
i = mapping->info.dir.first_dir_index = |
| 716 |
first_cluster == 0 ? 0 : s->directory.next; |
| 717 |
|
| 718 |
/* actually read the directory, and allocate the mappings */
|
| 719 |
while((entry=readdir(dir))) {
|
| 720 |
unsigned int length=strlen(dirname)+2+strlen(entry->d_name); |
| 721 |
char* buffer;
|
| 722 |
direntry_t* direntry; |
| 723 |
struct stat st;
|
| 724 |
int is_dot=!strcmp(entry->d_name,"."); |
| 725 |
int is_dotdot=!strcmp(entry->d_name,".."); |
| 726 |
|
| 727 |
if(first_cluster == 0 && (is_dotdot || is_dot)) |
| 728 |
continue;
|
| 729 |
|
| 730 |
buffer=(char*)malloc(length);
|
| 731 |
assert(buffer); |
| 732 |
snprintf(buffer,length,"%s/%s",dirname,entry->d_name);
|
| 733 |
|
| 734 |
if(stat(buffer,&st)<0) { |
| 735 |
free(buffer); |
| 736 |
continue;
|
| 737 |
} |
| 738 |
|
| 739 |
/* create directory entry for this file */
|
| 740 |
direntry=create_short_and_long_name(s, i, entry->d_name, |
| 741 |
is_dot || is_dotdot); |
| 742 |
direntry->attributes=(S_ISDIR(st.st_mode)?0x10:0x20); |
| 743 |
direntry->reserved[0]=direntry->reserved[1]=0; |
| 744 |
direntry->ctime=fat_datetime(st.st_ctime,1);
|
| 745 |
direntry->cdate=fat_datetime(st.st_ctime,0);
|
| 746 |
direntry->adate=fat_datetime(st.st_atime,0);
|
| 747 |
direntry->begin_hi=0;
|
| 748 |
direntry->mtime=fat_datetime(st.st_mtime,1);
|
| 749 |
direntry->mdate=fat_datetime(st.st_mtime,0);
|
| 750 |
if(is_dotdot)
|
| 751 |
set_begin_of_direntry(direntry, first_cluster_of_parent); |
| 752 |
else if(is_dot) |
| 753 |
set_begin_of_direntry(direntry, first_cluster); |
| 754 |
else
|
| 755 |
direntry->begin=0; /* do that later */ |
| 756 |
if (st.st_size > 0x7fffffff) { |
| 757 |
fprintf(stderr, "File %s is larger than 2GB\n", buffer);
|
| 758 |
free(buffer); |
| 759 |
return -2; |
| 760 |
} |
| 761 |
direntry->size=cpu_to_le32(S_ISDIR(st.st_mode)?0:st.st_size);
|
| 762 |
|
| 763 |
/* create mapping for this file */
|
| 764 |
if(!is_dot && !is_dotdot && (S_ISDIR(st.st_mode) || st.st_size)) {
|
| 765 |
s->current_mapping=(mapping_t*)array_get_next(&(s->mapping)); |
| 766 |
s->current_mapping->begin=0;
|
| 767 |
s->current_mapping->end=st.st_size; |
| 768 |
/*
|
| 769 |
* we get the direntry of the most recent direntry, which
|
| 770 |
* contains the short name and all the relevant information.
|
| 771 |
*/
|
| 772 |
s->current_mapping->dir_index=s->directory.next-1;
|
| 773 |
s->current_mapping->first_mapping_index = -1;
|
| 774 |
if (S_ISDIR(st.st_mode)) {
|
| 775 |
s->current_mapping->mode = MODE_DIRECTORY; |
| 776 |
s->current_mapping->info.dir.parent_mapping_index = |
| 777 |
mapping_index; |
| 778 |
} else {
|
| 779 |
s->current_mapping->mode = MODE_UNDEFINED; |
| 780 |
s->current_mapping->info.file.offset = 0;
|
| 781 |
} |
| 782 |
s->current_mapping->path=buffer; |
| 783 |
s->current_mapping->read_only = |
| 784 |
(st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) == 0;
|
| 785 |
} |
| 786 |
} |
| 787 |
closedir(dir); |
| 788 |
|
| 789 |
/* fill with zeroes up to the end of the cluster */
|
| 790 |
while(s->directory.next%(0x10*s->sectors_per_cluster)) { |
| 791 |
direntry_t* direntry=array_get_next(&(s->directory)); |
| 792 |
memset(direntry,0,sizeof(direntry_t)); |
| 793 |
} |
| 794 |
|
| 795 |
/* TODO: if there are more entries, bootsector has to be adjusted! */
|
| 796 |
#define ROOT_ENTRIES (0x02 * 0x10 * s->sectors_per_cluster) |
| 797 |
if (mapping_index == 0 && s->directory.next < ROOT_ENTRIES) { |
| 798 |
/* root directory */
|
| 799 |
int cur = s->directory.next;
|
| 800 |
array_ensure_allocated(&(s->directory), ROOT_ENTRIES - 1);
|
| 801 |
memset(array_get(&(s->directory), cur), 0,
|
| 802 |
(ROOT_ENTRIES - cur) * sizeof(direntry_t));
|
| 803 |
} |
| 804 |
|
| 805 |
/* reget the mapping, since s->mapping was possibly realloc()ed */
|
| 806 |
mapping = (mapping_t*)array_get(&(s->mapping), mapping_index); |
| 807 |
first_cluster += (s->directory.next - mapping->info.dir.first_dir_index) |
| 808 |
* 0x20 / s->cluster_size;
|
| 809 |
mapping->end = first_cluster; |
| 810 |
|
| 811 |
direntry = (direntry_t*)array_get(&(s->directory), mapping->dir_index); |
| 812 |
set_begin_of_direntry(direntry, mapping->begin); |
| 813 |
|
| 814 |
return 0; |
| 815 |
} |
| 816 |
|
| 817 |
static inline uint32_t sector2cluster(BDRVVVFATState* s,off_t sector_num) |
| 818 |
{
|
| 819 |
return (sector_num-s->faked_sectors)/s->sectors_per_cluster;
|
| 820 |
} |
| 821 |
|
| 822 |
static inline off_t cluster2sector(BDRVVVFATState* s, uint32_t cluster_num) |
| 823 |
{
|
| 824 |
return s->faked_sectors + s->sectors_per_cluster * cluster_num;
|
| 825 |
} |
| 826 |
|
| 827 |
static inline uint32_t sector_offset_in_cluster(BDRVVVFATState* s,off_t sector_num) |
| 828 |
{
|
| 829 |
return (sector_num-s->first_sectors_number-2*s->sectors_per_fat)%s->sectors_per_cluster; |
| 830 |
} |
| 831 |
|
| 832 |
#ifdef DBG
|
| 833 |
static direntry_t* get_direntry_for_mapping(BDRVVVFATState* s,mapping_t* mapping)
|
| 834 |
{
|
| 835 |
if(mapping->mode==MODE_UNDEFINED)
|
| 836 |
return 0; |
| 837 |
return (direntry_t*)(s->directory.pointer+sizeof(direntry_t)*mapping->dir_index); |
| 838 |
} |
| 839 |
#endif
|
| 840 |
|
| 841 |
static int init_directories(BDRVVVFATState* s, |
| 842 |
const char* dirname) |
| 843 |
{
|
| 844 |
bootsector_t* bootsector; |
| 845 |
mapping_t* mapping; |
| 846 |
unsigned int i; |
| 847 |
unsigned int cluster; |
| 848 |
|
| 849 |
memset(&(s->first_sectors[0]),0,0x40*0x200); |
| 850 |
|
| 851 |
s->cluster_size=s->sectors_per_cluster*0x200;
|
| 852 |
s->cluster_buffer=malloc(s->cluster_size); |
| 853 |
assert(s->cluster_buffer); |
| 854 |
|
| 855 |
/*
|
| 856 |
* The formula: sc = spf+1+spf*spc*(512*8/fat_type),
|
| 857 |
* where sc is sector_count,
|
| 858 |
* spf is sectors_per_fat,
|
| 859 |
* spc is sectors_per_clusters, and
|
| 860 |
* fat_type = 12, 16 or 32.
|
| 861 |
*/
|
| 862 |
i = 1+s->sectors_per_cluster*0x200*8/s->fat_type; |
| 863 |
s->sectors_per_fat=(s->sector_count+i)/i; /* round up */
|
| 864 |
|
| 865 |
array_init(&(s->mapping),sizeof(mapping_t));
|
| 866 |
array_init(&(s->directory),sizeof(direntry_t));
|
| 867 |
|
| 868 |
/* add volume label */
|
| 869 |
{
|
| 870 |
direntry_t* entry=array_get_next(&(s->directory)); |
| 871 |
entry->attributes=0x28; /* archive | volume label */ |
| 872 |
snprintf((char*)entry->name,11,"QEMU VVFAT"); |
| 873 |
} |
| 874 |
|
| 875 |
/* Now build FAT, and write back information into directory */
|
| 876 |
init_fat(s); |
| 877 |
|
| 878 |
s->faked_sectors=s->first_sectors_number+s->sectors_per_fat*2;
|
| 879 |
s->cluster_count=sector2cluster(s, s->sector_count); |
| 880 |
|
| 881 |
mapping = array_get_next(&(s->mapping)); |
| 882 |
mapping->begin = 0;
|
| 883 |
mapping->dir_index = 0;
|
| 884 |
mapping->info.dir.parent_mapping_index = -1;
|
| 885 |
mapping->first_mapping_index = -1;
|
| 886 |
mapping->path = strdup(dirname); |
| 887 |
i = strlen(mapping->path); |
| 888 |
if (i > 0 && mapping->path[i - 1] == '/') |
| 889 |
mapping->path[i - 1] = '\0'; |
| 890 |
mapping->mode = MODE_DIRECTORY; |
| 891 |
mapping->read_only = 0;
|
| 892 |
s->path = mapping->path; |
| 893 |
|
| 894 |
for (i = 0, cluster = 0; i < s->mapping.next; i++) { |
| 895 |
int j;
|
| 896 |
/* MS-DOS expects the FAT to be 0 for the root directory
|
| 897 |
* (except for the media byte). */
|
| 898 |
/* LATER TODO: still true for FAT32? */
|
| 899 |
int fix_fat = (i != 0); |
| 900 |
mapping = array_get(&(s->mapping), i); |
| 901 |
|
| 902 |
if (mapping->mode & MODE_DIRECTORY) {
|
| 903 |
mapping->begin = cluster; |
| 904 |
if(read_directory(s, i)) {
|
| 905 |
fprintf(stderr, "Could not read directory %s\n",
|
| 906 |
mapping->path); |
| 907 |
return -1; |
| 908 |
} |
| 909 |
mapping = array_get(&(s->mapping), i); |
| 910 |
} else {
|
| 911 |
assert(mapping->mode == MODE_UNDEFINED); |
| 912 |
mapping->mode=MODE_NORMAL; |
| 913 |
mapping->begin = cluster; |
| 914 |
if (mapping->end > 0) { |
| 915 |
direntry_t* direntry = array_get(&(s->directory), |
| 916 |
mapping->dir_index); |
| 917 |
|
| 918 |
mapping->end = cluster + 1 + (mapping->end-1)/s->cluster_size; |
| 919 |
set_begin_of_direntry(direntry, mapping->begin); |
| 920 |
} else {
|
| 921 |
mapping->end = cluster + 1;
|
| 922 |
fix_fat = 0;
|
| 923 |
} |
| 924 |
} |
| 925 |
|
| 926 |
assert(mapping->begin < mapping->end); |
| 927 |
|
| 928 |
/* fix fat for entry */
|
| 929 |
if (fix_fat) {
|
| 930 |
for(j = mapping->begin; j < mapping->end - 1; j++) |
| 931 |
fat_set(s, j, j+1);
|
| 932 |
fat_set(s, mapping->end - 1, s->max_fat_value);
|
| 933 |
} |
| 934 |
|
| 935 |
/* next free cluster */
|
| 936 |
cluster = mapping->end; |
| 937 |
|
| 938 |
if(cluster > s->cluster_count) {
|
| 939 |
fprintf(stderr,"Directory does not fit in FAT%d\n",s->fat_type);
|
| 940 |
return -1; |
| 941 |
} |
| 942 |
} |
| 943 |
|
| 944 |
mapping = array_get(&(s->mapping), 0);
|
| 945 |
s->sectors_of_root_directory = mapping->end * s->sectors_per_cluster; |
| 946 |
s->last_cluster_of_root_directory = mapping->end; |
| 947 |
|
| 948 |
/* the FAT signature */
|
| 949 |
fat_set(s,0,s->max_fat_value);
|
| 950 |
fat_set(s,1,s->max_fat_value);
|
| 951 |
|
| 952 |
s->current_mapping = NULL;
|
| 953 |
|
| 954 |
bootsector=(bootsector_t*)(s->first_sectors+(s->first_sectors_number-1)*0x200); |
| 955 |
bootsector->jump[0]=0xeb; |
| 956 |
bootsector->jump[1]=0x3e; |
| 957 |
bootsector->jump[2]=0x90; |
| 958 |
memcpy(bootsector->name,"QEMU ",8); |
| 959 |
bootsector->sector_size=cpu_to_le16(0x200);
|
| 960 |
bootsector->sectors_per_cluster=s->sectors_per_cluster; |
| 961 |
bootsector->reserved_sectors=cpu_to_le16(1);
|
| 962 |
bootsector->number_of_fats=0x2; /* number of FATs */ |
| 963 |
bootsector->root_entries=cpu_to_le16(s->sectors_of_root_directory*0x10);
|
| 964 |
bootsector->total_sectors16=s->sector_count>0xffff?0:cpu_to_le16(s->sector_count); |
| 965 |
bootsector->media_type=(s->fat_type!=12?0xf8:s->sector_count==5760?0xf9:0xf8); /* media descriptor */ |
| 966 |
s->fat.pointer[0] = bootsector->media_type;
|
| 967 |
bootsector->sectors_per_fat=cpu_to_le16(s->sectors_per_fat); |
| 968 |
bootsector->sectors_per_track=cpu_to_le16(s->bs->secs); |
| 969 |
bootsector->number_of_heads=cpu_to_le16(s->bs->heads); |
| 970 |
bootsector->hidden_sectors=cpu_to_le32(s->first_sectors_number==1?0:0x3f); |
| 971 |
bootsector->total_sectors=cpu_to_le32(s->sector_count>0xffff?s->sector_count:0); |
| 972 |
|
| 973 |
/* LATER TODO: if FAT32, this is wrong */
|
| 974 |
bootsector->u.fat16.drive_number=s->fat_type==12?0:0x80; /* assume this is hda (TODO) */ |
| 975 |
bootsector->u.fat16.current_head=0;
|
| 976 |
bootsector->u.fat16.signature=0x29;
|
| 977 |
bootsector->u.fat16.id=cpu_to_le32(0xfabe1afd);
|
| 978 |
|
| 979 |
memcpy(bootsector->u.fat16.volume_label,"QEMU VVFAT ",11); |
| 980 |
memcpy(bootsector->fat_type,(s->fat_type==12?"FAT12 ":s->fat_type==16?"FAT16 ":"FAT32 "),8); |
| 981 |
bootsector->magic[0]=0x55; bootsector->magic[1]=0xaa; |
| 982 |
|
| 983 |
return 0; |
| 984 |
} |
| 985 |
|
| 986 |
#ifdef DEBUG
|
| 987 |
static BDRVVVFATState *vvv = NULL; |
| 988 |
#endif
|
| 989 |
|
| 990 |
static int enable_write_target(BDRVVVFATState *s); |
| 991 |
static int is_consistent(BDRVVVFATState *s); |
| 992 |
|
| 993 |
static int vvfat_open(BlockDriverState *bs, const char* dirname, int flags) |
| 994 |
{
|
| 995 |
BDRVVVFATState *s = bs->opaque; |
| 996 |
int floppy = 0; |
| 997 |
int i;
|
| 998 |
|
| 999 |
#ifdef DEBUG
|
| 1000 |
vvv = s; |
| 1001 |
#endif
|
| 1002 |
|
| 1003 |
DLOG(if (stderr == NULL) { |
| 1004 |
stderr = fopen("vvfat.log", "a"); |
| 1005 |
setbuf(stderr, NULL);
|
| 1006 |
}) |
| 1007 |
|
| 1008 |
s->bs = bs; |
| 1009 |
|
| 1010 |
s->fat_type=16;
|
| 1011 |
/* LATER TODO: if FAT32, adjust */
|
| 1012 |
s->sectors_per_cluster=0x10;
|
| 1013 |
/* 504MB disk*/
|
| 1014 |
bs->cyls=1024; bs->heads=16; bs->secs=63; |
| 1015 |
|
| 1016 |
s->current_cluster=0xffffffff;
|
| 1017 |
|
| 1018 |
s->first_sectors_number=0x40;
|
| 1019 |
/* read only is the default for safety */
|
| 1020 |
bs->read_only = 1;
|
| 1021 |
s->qcow = s->write_target = NULL;
|
| 1022 |
s->qcow_filename = NULL;
|
| 1023 |
s->fat2 = NULL;
|
| 1024 |
s->downcase_short_names = 1;
|
| 1025 |
|
| 1026 |
if (!strstart(dirname, "fat:", NULL)) |
| 1027 |
return -1; |
| 1028 |
|
| 1029 |
if (strstr(dirname, ":floppy:")) { |
| 1030 |
floppy = 1;
|
| 1031 |
s->fat_type = 12;
|
| 1032 |
s->first_sectors_number = 1;
|
| 1033 |
s->sectors_per_cluster=2;
|
| 1034 |
bs->cyls = 80; bs->heads = 2; bs->secs = 36; |
| 1035 |
} |
| 1036 |
|
| 1037 |
s->sector_count=bs->cyls*bs->heads*bs->secs; |
| 1038 |
|
| 1039 |
if (strstr(dirname, ":32:")) { |
| 1040 |
fprintf(stderr, "Big fat greek warning: FAT32 has not been tested. You are welcome to do so!\n");
|
| 1041 |
s->fat_type = 32;
|
| 1042 |
} else if (strstr(dirname, ":16:")) { |
| 1043 |
s->fat_type = 16;
|
| 1044 |
} else if (strstr(dirname, ":12:")) { |
| 1045 |
s->fat_type = 12;
|
| 1046 |
s->sector_count=2880;
|
| 1047 |
} |
| 1048 |
|
| 1049 |
if (strstr(dirname, ":rw:")) { |
| 1050 |
if (enable_write_target(s))
|
| 1051 |
return -1; |
| 1052 |
bs->read_only = 0;
|
| 1053 |
} |
| 1054 |
|
| 1055 |
i = strrchr(dirname, ':') - dirname;
|
| 1056 |
assert(i >= 3);
|
| 1057 |
if (dirname[i-2] == ':' && isalpha(dirname[i-1])) |
| 1058 |
/* workaround for DOS drive names */
|
| 1059 |
dirname += i-1;
|
| 1060 |
else
|
| 1061 |
dirname += i+1;
|
| 1062 |
|
| 1063 |
bs->total_sectors=bs->cyls*bs->heads*bs->secs; |
| 1064 |
|
| 1065 |
if(init_directories(s, dirname))
|
| 1066 |
return -1; |
| 1067 |
|
| 1068 |
s->sector_count = s->faked_sectors + s->sectors_per_cluster*s->cluster_count; |
| 1069 |
|
| 1070 |
if(s->first_sectors_number==0x40) |
| 1071 |
init_mbr(s); |
| 1072 |
|
| 1073 |
/* for some reason or other, MS-DOS does not like to know about CHS... */
|
| 1074 |
if (floppy)
|
| 1075 |
bs->heads = bs->cyls = bs->secs = 0;
|
| 1076 |
|
| 1077 |
// assert(is_consistent(s));
|
| 1078 |
return 0; |
| 1079 |
} |
| 1080 |
|
| 1081 |
static inline void vvfat_close_current_file(BDRVVVFATState *s) |
| 1082 |
{
|
| 1083 |
if(s->current_mapping) {
|
| 1084 |
s->current_mapping = NULL;
|
| 1085 |
if (s->current_fd) {
|
| 1086 |
close(s->current_fd); |
| 1087 |
s->current_fd = 0;
|
| 1088 |
} |
| 1089 |
} |
| 1090 |
s->current_cluster = -1;
|
| 1091 |
} |
| 1092 |
|
| 1093 |
/* mappings between index1 and index2-1 are supposed to be ordered
|
| 1094 |
* return value is the index of the last mapping for which end>cluster_num
|
| 1095 |
*/
|
| 1096 |
static inline int find_mapping_for_cluster_aux(BDRVVVFATState* s,int cluster_num,int index1,int index2) |
| 1097 |
{
|
| 1098 |
int index3=index1+1; |
| 1099 |
while(1) { |
| 1100 |
mapping_t* mapping; |
| 1101 |
index3=(index1+index2)/2;
|
| 1102 |
mapping=array_get(&(s->mapping),index3); |
| 1103 |
assert(mapping->begin < mapping->end); |
| 1104 |
if(mapping->begin>=cluster_num) {
|
| 1105 |
assert(index2!=index3 || index2==0);
|
| 1106 |
if(index2==index3)
|
| 1107 |
return index1;
|
| 1108 |
index2=index3; |
| 1109 |
} else {
|
| 1110 |
if(index1==index3)
|
| 1111 |
return mapping->end<=cluster_num ? index2 : index1;
|
| 1112 |
index1=index3; |
| 1113 |
} |
| 1114 |
assert(index1<=index2); |
| 1115 |
DLOG(mapping=array_get(&(s->mapping),index1); |
| 1116 |
assert(mapping->begin<=cluster_num); |
| 1117 |
assert(index2 >= s->mapping.next || |
| 1118 |
((mapping = array_get(&(s->mapping),index2)) && |
| 1119 |
mapping->end>cluster_num))); |
| 1120 |
} |
| 1121 |
} |
| 1122 |
|
| 1123 |
static inline mapping_t* find_mapping_for_cluster(BDRVVVFATState* s,int cluster_num) |
| 1124 |
{
|
| 1125 |
int index=find_mapping_for_cluster_aux(s,cluster_num,0,s->mapping.next); |
| 1126 |
mapping_t* mapping; |
| 1127 |
if(index>=s->mapping.next)
|
| 1128 |
return 0; |
| 1129 |
mapping=array_get(&(s->mapping),index); |
| 1130 |
if(mapping->begin>cluster_num)
|
| 1131 |
return 0; |
| 1132 |
assert(mapping->begin<=cluster_num && mapping->end>cluster_num); |
| 1133 |
return mapping;
|
| 1134 |
} |
| 1135 |
|
| 1136 |
/*
|
| 1137 |
* This function simply compares path == mapping->path. Since the mappings
|
| 1138 |
* are sorted by cluster, this is expensive: O(n).
|
| 1139 |
*/
|
| 1140 |
static inline mapping_t* find_mapping_for_path(BDRVVVFATState* s, |
| 1141 |
const char* path) |
| 1142 |
{
|
| 1143 |
int i;
|
| 1144 |
|
| 1145 |
for (i = 0; i < s->mapping.next; i++) { |
| 1146 |
mapping_t* mapping = array_get(&(s->mapping), i); |
| 1147 |
if (mapping->first_mapping_index < 0 && |
| 1148 |
!strcmp(path, mapping->path)) |
| 1149 |
return mapping;
|
| 1150 |
} |
| 1151 |
|
| 1152 |
return NULL; |
| 1153 |
} |
| 1154 |
|
| 1155 |
static int open_file(BDRVVVFATState* s,mapping_t* mapping) |
| 1156 |
{
|
| 1157 |
if(!mapping)
|
| 1158 |
return -1; |
| 1159 |
if(!s->current_mapping ||
|
| 1160 |
strcmp(s->current_mapping->path,mapping->path)) {
|
| 1161 |
/* open file */
|
| 1162 |
int fd = open(mapping->path, O_RDONLY | O_BINARY | O_LARGEFILE);
|
| 1163 |
if(fd<0) |
| 1164 |
return -1; |
| 1165 |
vvfat_close_current_file(s); |
| 1166 |
s->current_fd = fd; |
| 1167 |
s->current_mapping = mapping; |
| 1168 |
} |
| 1169 |
return 0; |
| 1170 |
} |
| 1171 |
|
| 1172 |
static inline int read_cluster(BDRVVVFATState *s,int cluster_num) |
| 1173 |
{
|
| 1174 |
if(s->current_cluster != cluster_num) {
|
| 1175 |
int result=0; |
| 1176 |
off_t offset; |
| 1177 |
assert(!s->current_mapping || s->current_fd || (s->current_mapping->mode & MODE_DIRECTORY)); |
| 1178 |
if(!s->current_mapping
|
| 1179 |
|| s->current_mapping->begin>cluster_num |
| 1180 |
|| s->current_mapping->end<=cluster_num) {
|
| 1181 |
/* binary search of mappings for file */
|
| 1182 |
mapping_t* mapping=find_mapping_for_cluster(s,cluster_num); |
| 1183 |
|
| 1184 |
assert(!mapping || (cluster_num>=mapping->begin && cluster_num<mapping->end)); |
| 1185 |
|
| 1186 |
if (mapping && mapping->mode & MODE_DIRECTORY) {
|
| 1187 |
vvfat_close_current_file(s); |
| 1188 |
s->current_mapping = mapping; |
| 1189 |
read_cluster_directory:
|
| 1190 |
offset = s->cluster_size*(cluster_num-s->current_mapping->begin); |
| 1191 |
s->cluster = (unsigned char*)s->directory.pointer+offset |
| 1192 |
+ 0x20*s->current_mapping->info.dir.first_dir_index;
|
| 1193 |
assert(((s->cluster-(unsigned char*)s->directory.pointer)%s->cluster_size)==0); |
| 1194 |
assert((char*)s->cluster+s->cluster_size <= s->directory.pointer+s->directory.next*s->directory.item_size);
|
| 1195 |
s->current_cluster = cluster_num; |
| 1196 |
return 0; |
| 1197 |
} |
| 1198 |
|
| 1199 |
if(open_file(s,mapping))
|
| 1200 |
return -2; |
| 1201 |
} else if (s->current_mapping->mode & MODE_DIRECTORY) |
| 1202 |
goto read_cluster_directory;
|
| 1203 |
|
| 1204 |
assert(s->current_fd); |
| 1205 |
|
| 1206 |
offset=s->cluster_size*(cluster_num-s->current_mapping->begin)+s->current_mapping->info.file.offset; |
| 1207 |
if(lseek(s->current_fd, offset, SEEK_SET)!=offset)
|
| 1208 |
return -3; |
| 1209 |
s->cluster=s->cluster_buffer; |
| 1210 |
result=read(s->current_fd,s->cluster,s->cluster_size); |
| 1211 |
if(result<0) { |
| 1212 |
s->current_cluster = -1;
|
| 1213 |
return -1; |
| 1214 |
} |
| 1215 |
s->current_cluster = cluster_num; |
| 1216 |
} |
| 1217 |
return 0; |
| 1218 |
} |
| 1219 |
|
| 1220 |
#ifdef DEBUG
|
| 1221 |
static void hexdump(const void* address, uint32_t len) |
| 1222 |
{
|
| 1223 |
const unsigned char* p = address; |
| 1224 |
int i, j;
|
| 1225 |
|
| 1226 |
for (i = 0; i < len; i += 16) { |
| 1227 |
for (j = 0; j < 16 && i + j < len; j++) |
| 1228 |
fprintf(stderr, "%02x ", p[i + j]);
|
| 1229 |
for (; j < 16; j++) |
| 1230 |
fprintf(stderr, " ");
|
| 1231 |
fprintf(stderr, " ");
|
| 1232 |
for (j = 0; j < 16 && i + j < len; j++) |
| 1233 |
fprintf(stderr, "%c", (p[i + j] < ' ' || p[i + j] > 0x7f) ? '.' : p[i + j]); |
| 1234 |
fprintf(stderr, "\n");
|
| 1235 |
} |
| 1236 |
} |
| 1237 |
|
| 1238 |
static void print_direntry(const direntry_t* direntry) |
| 1239 |
{
|
| 1240 |
int j = 0; |
| 1241 |
char buffer[1024]; |
| 1242 |
|
| 1243 |
fprintf(stderr, "direntry 0x%x: ", (int)direntry); |
| 1244 |
if(!direntry)
|
| 1245 |
return;
|
| 1246 |
if(is_long_name(direntry)) {
|
| 1247 |
unsigned char* c=(unsigned char*)direntry; |
| 1248 |
int i;
|
| 1249 |
for(i=1;i<11 && c[i] && c[i]!=0xff;i+=2) |
| 1250 |
#define ADD_CHAR(c) {buffer[j] = (c); if (buffer[j] < ' ') buffer[j] = '?'; j++;} |
| 1251 |
ADD_CHAR(c[i]); |
| 1252 |
for(i=14;i<26 && c[i] && c[i]!=0xff;i+=2) |
| 1253 |
ADD_CHAR(c[i]); |
| 1254 |
for(i=28;i<32 && c[i] && c[i]!=0xff;i+=2) |
| 1255 |
ADD_CHAR(c[i]); |
| 1256 |
buffer[j] = 0;
|
| 1257 |
fprintf(stderr, "%s\n", buffer);
|
| 1258 |
} else {
|
| 1259 |
int i;
|
| 1260 |
for(i=0;i<11;i++) |
| 1261 |
ADD_CHAR(direntry->name[i]); |
| 1262 |
buffer[j] = 0;
|
| 1263 |
fprintf(stderr,"%s attributes=0x%02x begin=%d size=%d\n",
|
| 1264 |
buffer, |
| 1265 |
direntry->attributes, |
| 1266 |
begin_of_direntry(direntry),le32_to_cpu(direntry->size)); |
| 1267 |
} |
| 1268 |
} |
| 1269 |
|
| 1270 |
static void print_mapping(const mapping_t* mapping) |
| 1271 |
{
|
| 1272 |
fprintf(stderr, "mapping (0x%x): begin, end = %d, %d, dir_index = %d, first_mapping_index = %d, name = %s, mode = 0x%x, " , (int)mapping, mapping->begin, mapping->end, mapping->dir_index, mapping->first_mapping_index, mapping->path, mapping->mode); |
| 1273 |
if (mapping->mode & MODE_DIRECTORY)
|
| 1274 |
fprintf(stderr, "parent_mapping_index = %d, first_dir_index = %d\n", mapping->info.dir.parent_mapping_index, mapping->info.dir.first_dir_index);
|
| 1275 |
else
|
| 1276 |
fprintf(stderr, "offset = %d\n", mapping->info.file.offset);
|
| 1277 |
} |
| 1278 |
#endif
|
| 1279 |
|
| 1280 |
static int vvfat_read(BlockDriverState *bs, int64_t sector_num, |
| 1281 |
uint8_t *buf, int nb_sectors)
|
| 1282 |
{
|
| 1283 |
BDRVVVFATState *s = bs->opaque; |
| 1284 |
int i;
|
| 1285 |
|
| 1286 |
for(i=0;i<nb_sectors;i++,sector_num++) { |
| 1287 |
if (sector_num >= s->sector_count)
|
| 1288 |
return -1; |
| 1289 |
if (s->qcow) {
|
| 1290 |
int n;
|
| 1291 |
if (s->qcow->drv->bdrv_is_allocated(s->qcow,
|
| 1292 |
sector_num, nb_sectors-i, &n)) {
|
| 1293 |
DLOG(fprintf(stderr, "sectors %d+%d allocated\n", (int)sector_num, n)); |
| 1294 |
if (s->qcow->drv->bdrv_read(s->qcow, sector_num, buf+i*0x200, n)) |
| 1295 |
return -1; |
| 1296 |
i += n - 1;
|
| 1297 |
sector_num += n - 1;
|
| 1298 |
continue;
|
| 1299 |
} |
| 1300 |
DLOG(fprintf(stderr, "sector %d not allocated\n", (int)sector_num)); |
| 1301 |
} |
| 1302 |
if(sector_num<s->faked_sectors) {
|
| 1303 |
if(sector_num<s->first_sectors_number)
|
| 1304 |
memcpy(buf+i*0x200,&(s->first_sectors[sector_num*0x200]),0x200); |
| 1305 |
else if(sector_num-s->first_sectors_number<s->sectors_per_fat) |
| 1306 |
memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number)*0x200]),0x200); |
| 1307 |
else if(sector_num-s->first_sectors_number-s->sectors_per_fat<s->sectors_per_fat) |
| 1308 |
memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number-s->sectors_per_fat)*0x200]),0x200); |
| 1309 |
} else {
|
| 1310 |
uint32_t sector=sector_num-s->faked_sectors, |
| 1311 |
sector_offset_in_cluster=(sector%s->sectors_per_cluster), |
| 1312 |
cluster_num=sector/s->sectors_per_cluster; |
| 1313 |
if(read_cluster(s, cluster_num) != 0) { |
| 1314 |
/* LATER TODO: strict: return -1; */
|
| 1315 |
memset(buf+i*0x200,0,0x200); |
| 1316 |
continue;
|
| 1317 |
} |
| 1318 |
memcpy(buf+i*0x200,s->cluster+sector_offset_in_cluster*0x200,0x200); |
| 1319 |
} |
| 1320 |
} |
| 1321 |
return 0; |
| 1322 |
} |
| 1323 |
|
| 1324 |
/* LATER TODO: statify all functions */
|
| 1325 |
|
| 1326 |
/*
|
| 1327 |
* Idea of the write support (use snapshot):
|
| 1328 |
*
|
| 1329 |
* 1. check if all data is consistent, recording renames, modifications,
|
| 1330 |
* new files and directories (in s->commits).
|
| 1331 |
*
|
| 1332 |
* 2. if the data is not consistent, stop committing
|
| 1333 |
*
|
| 1334 |
* 3. handle renames, and create new files and directories (do not yet
|
| 1335 |
* write their contents)
|
| 1336 |
*
|
| 1337 |
* 4. walk the directories, fixing the mapping and direntries, and marking
|
| 1338 |
* the handled mappings as not deleted
|
| 1339 |
*
|
| 1340 |
* 5. commit the contents of the files
|
| 1341 |
*
|
| 1342 |
* 6. handle deleted files and directories
|
| 1343 |
*
|
| 1344 |
*/
|
| 1345 |
|
| 1346 |
typedef struct commit_t { |
| 1347 |
char* path;
|
| 1348 |
union {
|
| 1349 |
struct { uint32_t cluster; } rename;
|
| 1350 |
struct { int dir_index; uint32_t modified_offset; } writeout; |
| 1351 |
struct { uint32_t first_cluster; } new_file;
|
| 1352 |
struct { uint32_t cluster; } mkdir;
|
| 1353 |
} param; |
| 1354 |
/* DELETEs and RMDIRs are handled differently: see handle_deletes() */
|
| 1355 |
enum {
|
| 1356 |
ACTION_RENAME, ACTION_WRITEOUT, ACTION_NEW_FILE, ACTION_MKDIR |
| 1357 |
} action; |
| 1358 |
} commit_t; |
| 1359 |
|
| 1360 |
static void clear_commits(BDRVVVFATState* s) |
| 1361 |
{
|
| 1362 |
int i;
|
| 1363 |
DLOG(fprintf(stderr, "clear_commits (%d commits)\n", s->commits.next));
|
| 1364 |
for (i = 0; i < s->commits.next; i++) { |
| 1365 |
commit_t* commit = array_get(&(s->commits), i); |
| 1366 |
assert(commit->path || commit->action == ACTION_WRITEOUT); |
| 1367 |
if (commit->action != ACTION_WRITEOUT) {
|
| 1368 |
assert(commit->path); |
| 1369 |
free(commit->path); |
| 1370 |
} else
|
| 1371 |
assert(commit->path == NULL);
|
| 1372 |
} |
| 1373 |
s->commits.next = 0;
|
| 1374 |
} |
| 1375 |
|
| 1376 |
static void schedule_rename(BDRVVVFATState* s, |
| 1377 |
uint32_t cluster, char* new_path)
|
| 1378 |
{
|
| 1379 |
commit_t* commit = array_get_next(&(s->commits)); |
| 1380 |
commit->path = new_path; |
| 1381 |
commit->param.rename.cluster = cluster; |
| 1382 |
commit->action = ACTION_RENAME; |
| 1383 |
} |
| 1384 |
|
| 1385 |
static void schedule_writeout(BDRVVVFATState* s, |
| 1386 |
int dir_index, uint32_t modified_offset)
|
| 1387 |
{
|
| 1388 |
commit_t* commit = array_get_next(&(s->commits)); |
| 1389 |
commit->path = NULL;
|
| 1390 |
commit->param.writeout.dir_index = dir_index; |
| 1391 |
commit->param.writeout.modified_offset = modified_offset; |
| 1392 |
commit->action = ACTION_WRITEOUT; |
| 1393 |
} |
| 1394 |
|
| 1395 |
static void schedule_new_file(BDRVVVFATState* s, |
| 1396 |
char* path, uint32_t first_cluster)
|
| 1397 |
{
|
| 1398 |
commit_t* commit = array_get_next(&(s->commits)); |
| 1399 |
commit->path = path; |
| 1400 |
commit->param.new_file.first_cluster = first_cluster; |
| 1401 |
commit->action = ACTION_NEW_FILE; |
| 1402 |
} |
| 1403 |
|
| 1404 |
static void schedule_mkdir(BDRVVVFATState* s, uint32_t cluster, char* path) |
| 1405 |
{
|
| 1406 |
commit_t* commit = array_get_next(&(s->commits)); |
| 1407 |
commit->path = path; |
| 1408 |
commit->param.mkdir.cluster = cluster; |
| 1409 |
commit->action = ACTION_MKDIR; |
| 1410 |
} |
| 1411 |
|
| 1412 |
typedef struct { |
| 1413 |
/*
|
| 1414 |
* Since the sequence number is at most 0x3f, and the filename
|
| 1415 |
* length is at most 13 times the sequence number, the maximal
|
| 1416 |
* filename length is 0x3f * 13 bytes.
|
| 1417 |
*/
|
| 1418 |
unsigned char name[0x3f * 13 + 1]; |
| 1419 |
int checksum, len;
|
| 1420 |
int sequence_number;
|
| 1421 |
} long_file_name; |
| 1422 |
|
| 1423 |
static void lfn_init(long_file_name* lfn) |
| 1424 |
{
|
| 1425 |
lfn->sequence_number = lfn->len = 0;
|
| 1426 |
lfn->checksum = 0x100;
|
| 1427 |
} |
| 1428 |
|
| 1429 |
/* return 0 if parsed successfully, > 0 if no long name, < 0 if error */
|
| 1430 |
static int parse_long_name(long_file_name* lfn, |
| 1431 |
const direntry_t* direntry)
|
| 1432 |
{
|
| 1433 |
int i, j, offset;
|
| 1434 |
const unsigned char* pointer = (const unsigned char*)direntry; |
| 1435 |
|
| 1436 |
if (!is_long_name(direntry))
|
| 1437 |
return 1; |
| 1438 |
|
| 1439 |
if (pointer[0] & 0x40) { |
| 1440 |
lfn->sequence_number = pointer[0] & 0x3f; |
| 1441 |
lfn->checksum = pointer[13];
|
| 1442 |
lfn->name[0] = 0; |
| 1443 |
} else if ((pointer[0] & 0x3f) != --lfn->sequence_number) |
| 1444 |
return -1; |
| 1445 |
else if (pointer[13] != lfn->checksum) |
| 1446 |
return -2; |
| 1447 |
else if (pointer[12] || pointer[26] || pointer[27]) |
| 1448 |
return -3; |
| 1449 |
|
| 1450 |
offset = 13 * (lfn->sequence_number - 1); |
| 1451 |
for (i = 0, j = 1; i < 13; i++, j+=2) { |
| 1452 |
if (j == 11) |
| 1453 |
j = 14;
|
| 1454 |
else if (j == 26) |
| 1455 |
j = 28;
|
| 1456 |
|
| 1457 |
if (pointer[j+1] == 0) |
| 1458 |
lfn->name[offset + i] = pointer[j]; |
| 1459 |
else if (pointer[j+1] != 0xff || (pointer[0] & 0x40) == 0) |
| 1460 |
return -4; |
| 1461 |
else
|
| 1462 |
lfn->name[offset + i] = 0;
|
| 1463 |
} |
| 1464 |
|
| 1465 |
if (pointer[0] & 0x40) |
| 1466 |
lfn->len = offset + strlen((char*)lfn->name + offset);
|
| 1467 |
|
| 1468 |
return 0; |
| 1469 |
} |
| 1470 |
|
| 1471 |
/* returns 0 if successful, >0 if no short_name, and <0 on error */
|
| 1472 |
static int parse_short_name(BDRVVVFATState* s, |
| 1473 |
long_file_name* lfn, direntry_t* direntry) |
| 1474 |
{
|
| 1475 |
int i, j;
|
| 1476 |
|
| 1477 |
if (!is_short_name(direntry))
|
| 1478 |
return 1; |
| 1479 |
|
| 1480 |
for (j = 7; j >= 0 && direntry->name[j] == ' '; j--); |
| 1481 |
for (i = 0; i <= j; i++) { |
| 1482 |
if (direntry->name[i] <= ' ' || direntry->name[i] > 0x7f) |
| 1483 |
return -1; |
| 1484 |
else if (s->downcase_short_names) |
| 1485 |
lfn->name[i] = tolower(direntry->name[i]); |
| 1486 |
else
|
| 1487 |
lfn->name[i] = direntry->name[i]; |
| 1488 |
} |
| 1489 |
|
| 1490 |
for (j = 2; j >= 0 && direntry->extension[j] == ' '; j--); |
| 1491 |
if (j >= 0) { |
| 1492 |
lfn->name[i++] = '.';
|
| 1493 |
lfn->name[i + j + 1] = '\0'; |
| 1494 |
for (;j >= 0; j--) { |
| 1495 |
if (direntry->extension[j] <= ' ' || direntry->extension[j] > 0x7f) |
| 1496 |
return -2; |
| 1497 |
else if (s->downcase_short_names) |
| 1498 |
lfn->name[i + j] = tolower(direntry->extension[j]); |
| 1499 |
else
|
| 1500 |
lfn->name[i + j] = direntry->extension[j]; |
| 1501 |
} |
| 1502 |
} else
|
| 1503 |
lfn->name[i + j + 1] = '\0'; |
| 1504 |
|
| 1505 |
lfn->len = strlen((char*)lfn->name);
|
| 1506 |
|
| 1507 |
return 0; |
| 1508 |
} |
| 1509 |
|
| 1510 |
static inline uint32_t modified_fat_get(BDRVVVFATState* s, |
| 1511 |
unsigned int cluster) |
| 1512 |
{
|
| 1513 |
if (cluster < s->last_cluster_of_root_directory) {
|
| 1514 |
if (cluster + 1 == s->last_cluster_of_root_directory) |
| 1515 |
return s->max_fat_value;
|
| 1516 |
else
|
| 1517 |
return cluster + 1; |
| 1518 |
} |
| 1519 |
|
| 1520 |
if (s->fat_type==32) { |
| 1521 |
uint32_t* entry=((uint32_t*)s->fat2)+cluster; |
| 1522 |
return le32_to_cpu(*entry);
|
| 1523 |
} else if (s->fat_type==16) { |
| 1524 |
uint16_t* entry=((uint16_t*)s->fat2)+cluster; |
| 1525 |
return le16_to_cpu(*entry);
|
| 1526 |
} else {
|
| 1527 |
const uint8_t* x=s->fat2+cluster*3/2; |
| 1528 |
return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff; |
| 1529 |
} |
| 1530 |
} |
| 1531 |
|
| 1532 |
static inline int cluster_was_modified(BDRVVVFATState* s, uint32_t cluster_num) |
| 1533 |
{
|
| 1534 |
int was_modified = 0; |
| 1535 |
int i, dummy;
|
| 1536 |
|
| 1537 |
if (s->qcow == NULL) |
| 1538 |
return 0; |
| 1539 |
|
| 1540 |
for (i = 0; !was_modified && i < s->sectors_per_cluster; i++) |
| 1541 |
was_modified = s->qcow->drv->bdrv_is_allocated(s->qcow, |
| 1542 |
cluster2sector(s, cluster_num) + i, 1, &dummy);
|
| 1543 |
|
| 1544 |
return was_modified;
|
| 1545 |
} |
| 1546 |
|
| 1547 |
static const char* get_basename(const char* path) |
| 1548 |
{
|
| 1549 |
char* basename = strrchr(path, '/'); |
| 1550 |
if (basename == NULL) |
| 1551 |
return path;
|
| 1552 |
else
|
| 1553 |
return basename + 1; /* strip '/' */ |
| 1554 |
} |
| 1555 |
|
| 1556 |
/*
|
| 1557 |
* The array s->used_clusters holds the states of the clusters. If it is
|
| 1558 |
* part of a file, it has bit 2 set, in case of a directory, bit 1. If it
|
| 1559 |
* was modified, bit 3 is set.
|
| 1560 |
* If any cluster is allocated, but not part of a file or directory, this
|
| 1561 |
* driver refuses to commit.
|
| 1562 |
*/
|
| 1563 |
typedef enum { |
| 1564 |
USED_DIRECTORY = 1, USED_FILE = 2, USED_ANY = 3, USED_ALLOCATED = 4 |
| 1565 |
} used_t; |
| 1566 |
|
| 1567 |
/*
|
| 1568 |
* get_cluster_count_for_direntry() not only determines how many clusters
|
| 1569 |
* are occupied by direntry, but also if it was renamed or modified.
|
| 1570 |
*
|
| 1571 |
* A file is thought to be renamed *only* if there already was a file with
|
| 1572 |
* exactly the same first cluster, but a different name.
|
| 1573 |
*
|
| 1574 |
* Further, the files/directories handled by this function are
|
| 1575 |
* assumed to be *not* deleted (and *only* those).
|
| 1576 |
*/
|
| 1577 |
static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
|
| 1578 |
direntry_t* direntry, const char* path) |
| 1579 |
{
|
| 1580 |
/*
|
| 1581 |
* This is a little bit tricky:
|
| 1582 |
* IF the guest OS just inserts a cluster into the file chain,
|
| 1583 |
* and leaves the rest alone, (i.e. the original file had clusters
|
| 1584 |
* 15 -> 16, but now has 15 -> 32 -> 16), then the following happens:
|
| 1585 |
*
|
| 1586 |
* - do_commit will write the cluster into the file at the given
|
| 1587 |
* offset, but
|
| 1588 |
*
|
| 1589 |
* - the cluster which is overwritten should be moved to a later
|
| 1590 |
* position in the file.
|
| 1591 |
*
|
| 1592 |
* I am not aware that any OS does something as braindead, but this
|
| 1593 |
* situation could happen anyway when not committing for a long time.
|
| 1594 |
* Just to be sure that this does not bite us, detect it, and copy the
|
| 1595 |
* contents of the clusters to-be-overwritten into the qcow.
|
| 1596 |
*/
|
| 1597 |
int copy_it = 0; |
| 1598 |
int was_modified = 0; |
| 1599 |
int32_t ret = 0;
|
| 1600 |
|
| 1601 |
uint32_t cluster_num = begin_of_direntry(direntry); |
| 1602 |
uint32_t offset = 0;
|
| 1603 |
int first_mapping_index = -1; |
| 1604 |
mapping_t* mapping = NULL;
|
| 1605 |
const char* basename2 = NULL; |
| 1606 |
|
| 1607 |
vvfat_close_current_file(s); |
| 1608 |
|
| 1609 |
/* the root directory */
|
| 1610 |
if (cluster_num == 0) |
| 1611 |
return 0; |
| 1612 |
|
| 1613 |
/* write support */
|
| 1614 |
if (s->qcow) {
|
| 1615 |
basename2 = get_basename(path); |
| 1616 |
|
| 1617 |
mapping = find_mapping_for_cluster(s, cluster_num); |
| 1618 |
|
| 1619 |
if (mapping) {
|
| 1620 |
const char* basename; |
| 1621 |
|
| 1622 |
assert(mapping->mode & MODE_DELETED); |
| 1623 |
mapping->mode &= ~MODE_DELETED; |
| 1624 |
|
| 1625 |
basename = get_basename(mapping->path); |
| 1626 |
|
| 1627 |
assert(mapping->mode & MODE_NORMAL); |
| 1628 |
|
| 1629 |
/* rename */
|
| 1630 |
if (strcmp(basename, basename2))
|
| 1631 |
schedule_rename(s, cluster_num, strdup(path)); |
| 1632 |
} else if (is_file(direntry)) |
| 1633 |
/* new file */
|
| 1634 |
schedule_new_file(s, strdup(path), cluster_num); |
| 1635 |
else {
|
| 1636 |
assert(0);
|
| 1637 |
return 0; |
| 1638 |
} |
| 1639 |
} |
| 1640 |
|
| 1641 |
while(1) { |
| 1642 |
if (s->qcow) {
|
| 1643 |
if (!copy_it && cluster_was_modified(s, cluster_num)) {
|
| 1644 |
if (mapping == NULL || |
| 1645 |
mapping->begin > cluster_num || |
| 1646 |
mapping->end <= cluster_num) |
| 1647 |
mapping = find_mapping_for_cluster(s, cluster_num); |
| 1648 |
|
| 1649 |
|
| 1650 |
if (mapping &&
|
| 1651 |
(mapping->mode & MODE_DIRECTORY) == 0) {
|
| 1652 |
|
| 1653 |
/* was modified in qcow */
|
| 1654 |
if (offset != mapping->info.file.offset + s->cluster_size
|
| 1655 |
* (cluster_num - mapping->begin)) {
|
| 1656 |
/* offset of this cluster in file chain has changed */
|
| 1657 |
assert(0);
|
| 1658 |
copy_it = 1;
|
| 1659 |
} else if (offset == 0) { |
| 1660 |
const char* basename = get_basename(mapping->path); |
| 1661 |
|
| 1662 |
if (strcmp(basename, basename2))
|
| 1663 |
copy_it = 1;
|
| 1664 |
first_mapping_index = array_index(&(s->mapping), mapping); |
| 1665 |
} |
| 1666 |
|
| 1667 |
if (mapping->first_mapping_index != first_mapping_index
|
| 1668 |
&& mapping->info.file.offset > 0) {
|
| 1669 |
assert(0);
|
| 1670 |
copy_it = 1;
|
| 1671 |
} |
| 1672 |
|
| 1673 |
/* need to write out? */
|
| 1674 |
if (!was_modified && is_file(direntry)) {
|
| 1675 |
was_modified = 1;
|
| 1676 |
schedule_writeout(s, mapping->dir_index, offset); |
| 1677 |
} |
| 1678 |
} |
| 1679 |
} |
| 1680 |
|
| 1681 |
if (copy_it) {
|
| 1682 |
int i, dummy;
|
| 1683 |
/*
|
| 1684 |
* This is horribly inefficient, but that is okay, since
|
| 1685 |
* it is rarely executed, if at all.
|
| 1686 |
*/
|
| 1687 |
int64_t offset = cluster2sector(s, cluster_num); |
| 1688 |
|
| 1689 |
vvfat_close_current_file(s); |
| 1690 |
for (i = 0; i < s->sectors_per_cluster; i++) |
| 1691 |
if (!s->qcow->drv->bdrv_is_allocated(s->qcow,
|
| 1692 |
offset + i, 1, &dummy)) {
|
| 1693 |
if (vvfat_read(s->bs,
|
| 1694 |
offset, s->cluster_buffer, 1))
|
| 1695 |
return -1; |
| 1696 |
if (s->qcow->drv->bdrv_write(s->qcow,
|
| 1697 |
offset, s->cluster_buffer, 1))
|
| 1698 |
return -2; |
| 1699 |
} |
| 1700 |
} |
| 1701 |
} |
| 1702 |
|
| 1703 |
ret++; |
| 1704 |
if (s->used_clusters[cluster_num] & USED_ANY)
|
| 1705 |
return 0; |
| 1706 |
s->used_clusters[cluster_num] = USED_FILE; |
| 1707 |
|
| 1708 |
cluster_num = modified_fat_get(s, cluster_num); |
| 1709 |
|
| 1710 |
if (fat_eof(s, cluster_num))
|
| 1711 |
return ret;
|
| 1712 |
else if (cluster_num < 2 || cluster_num > s->max_fat_value - 16) |
| 1713 |
return -1; |
| 1714 |
|
| 1715 |
offset += s->cluster_size; |
| 1716 |
} |
| 1717 |
} |
| 1718 |
|
| 1719 |
/*
|
| 1720 |
* This function looks at the modified data (qcow).
|
| 1721 |
* It returns 0 upon inconsistency or error, and the number of clusters
|
| 1722 |
* used by the directory, its subdirectories and their files.
|
| 1723 |
*/
|
| 1724 |
static int check_directory_consistency(BDRVVVFATState *s, |
| 1725 |
int cluster_num, const char* path) |
| 1726 |
{
|
| 1727 |
int ret = 0; |
| 1728 |
unsigned char* cluster = malloc(s->cluster_size); |
| 1729 |
direntry_t* direntries = (direntry_t*)cluster; |
| 1730 |
mapping_t* mapping = find_mapping_for_cluster(s, cluster_num); |
| 1731 |
|
| 1732 |
long_file_name lfn; |
| 1733 |
int path_len = strlen(path);
|
| 1734 |
char path2[PATH_MAX];
|
| 1735 |
|
| 1736 |
assert(path_len < PATH_MAX); /* len was tested before! */
|
| 1737 |
strcpy(path2, path); |
| 1738 |
path2[path_len] = '/';
|
| 1739 |
path2[path_len + 1] = '\0'; |
| 1740 |
|
| 1741 |
if (mapping) {
|
| 1742 |
const char* basename = get_basename(mapping->path); |
| 1743 |
const char* basename2 = get_basename(path); |
| 1744 |
|
| 1745 |
assert(mapping->mode & MODE_DIRECTORY); |
| 1746 |
|
| 1747 |
assert(mapping->mode & MODE_DELETED); |
| 1748 |
mapping->mode &= ~MODE_DELETED; |
| 1749 |
|
| 1750 |
if (strcmp(basename, basename2))
|
| 1751 |
schedule_rename(s, cluster_num, strdup(path)); |
| 1752 |
} else
|
| 1753 |
/* new directory */
|
| 1754 |
schedule_mkdir(s, cluster_num, strdup(path)); |
| 1755 |
|
| 1756 |
lfn_init(&lfn); |
| 1757 |
do {
|
| 1758 |
int i;
|
| 1759 |
int subret = 0; |
| 1760 |
|
| 1761 |
ret++; |
| 1762 |
|
| 1763 |
if (s->used_clusters[cluster_num] & USED_ANY) {
|
| 1764 |
fprintf(stderr, "cluster %d used more than once\n", (int)cluster_num); |
| 1765 |
return 0; |
| 1766 |
} |
| 1767 |
s->used_clusters[cluster_num] = USED_DIRECTORY; |
| 1768 |
|
| 1769 |
DLOG(fprintf(stderr, "read cluster %d (sector %d)\n", (int)cluster_num, (int)cluster2sector(s, cluster_num))); |
| 1770 |
subret = vvfat_read(s->bs, cluster2sector(s, cluster_num), cluster, |
| 1771 |
s->sectors_per_cluster); |
| 1772 |
if (subret) {
|
| 1773 |
fprintf(stderr, "Error fetching direntries\n");
|
| 1774 |
fail:
|
| 1775 |
free(cluster); |
| 1776 |
return 0; |
| 1777 |
} |
| 1778 |
|
| 1779 |
for (i = 0; i < 0x10 * s->sectors_per_cluster; i++) { |
| 1780 |
int cluster_count;
|
| 1781 |
|
| 1782 |
DLOG(fprintf(stderr, "check direntry %d: \n", i); print_direntry(direntries + i));
|
| 1783 |
if (is_volume_label(direntries + i) || is_dot(direntries + i) ||
|
| 1784 |
is_free(direntries + i)) |
| 1785 |
continue;
|
| 1786 |
|
| 1787 |
subret = parse_long_name(&lfn, direntries + i); |
| 1788 |
if (subret < 0) { |
| 1789 |
fprintf(stderr, "Error in long name\n");
|
| 1790 |
goto fail;
|
| 1791 |
} |
| 1792 |
if (subret == 0 || is_free(direntries + i)) |
| 1793 |
continue;
|
| 1794 |
|
| 1795 |
if (fat_chksum(direntries+i) != lfn.checksum) {
|
| 1796 |
subret = parse_short_name(s, &lfn, direntries + i); |
| 1797 |
if (subret < 0) { |
| 1798 |
fprintf(stderr, "Error in short name (%d)\n", subret);
|
| 1799 |
goto fail;
|
| 1800 |
} |
| 1801 |
if (subret > 0 || !strcmp((char*)lfn.name, ".") |
| 1802 |
|| !strcmp((char*)lfn.name, "..")) |
| 1803 |
continue;
|
| 1804 |
} |
| 1805 |
lfn.checksum = 0x100; /* cannot use long name twice */ |
| 1806 |
|
| 1807 |
if (path_len + 1 + lfn.len >= PATH_MAX) { |
| 1808 |
fprintf(stderr, "Name too long: %s/%s\n", path, lfn.name);
|
| 1809 |
goto fail;
|
| 1810 |
} |
| 1811 |
strcpy(path2 + path_len + 1, (char*)lfn.name); |
| 1812 |
|
| 1813 |
if (is_directory(direntries + i)) {
|
| 1814 |
if (begin_of_direntry(direntries + i) == 0) { |
| 1815 |
DLOG(fprintf(stderr, "invalid begin for directory: %s\n", path2); print_direntry(direntries + i));
|
| 1816 |
goto fail;
|
| 1817 |
} |
| 1818 |
cluster_count = check_directory_consistency(s, |
| 1819 |
begin_of_direntry(direntries + i), path2); |
| 1820 |
if (cluster_count == 0) { |
| 1821 |
DLOG(fprintf(stderr, "problem in directory %s:\n", path2); print_direntry(direntries + i));
|
| 1822 |
goto fail;
|
| 1823 |
} |
| 1824 |
} else if (is_file(direntries + i)) { |
| 1825 |
/* check file size with FAT */
|
| 1826 |
cluster_count = get_cluster_count_for_direntry(s, direntries + i, path2); |
| 1827 |
if (cluster_count !=
|
| 1828 |
(le32_to_cpu(direntries[i].size) + s->cluster_size |
| 1829 |
- 1) / s->cluster_size) {
|
| 1830 |
DLOG(fprintf(stderr, "Cluster count mismatch\n"));
|
| 1831 |
goto fail;
|
| 1832 |
} |
| 1833 |
} else
|
| 1834 |
assert(0); /* cluster_count = 0; */ |
| 1835 |
|
| 1836 |
ret += cluster_count; |
| 1837 |
} |
| 1838 |
|
| 1839 |
cluster_num = modified_fat_get(s, cluster_num); |
| 1840 |
} while(!fat_eof(s, cluster_num));
|
| 1841 |
|
| 1842 |
free(cluster); |
| 1843 |
return ret;
|
| 1844 |
} |
| 1845 |
|
| 1846 |
/* returns 1 on success */
|
| 1847 |
static int is_consistent(BDRVVVFATState* s) |
| 1848 |
{
|
| 1849 |
int i, check;
|
| 1850 |
int used_clusters_count = 0; |
| 1851 |
|
| 1852 |
DLOG(checkpoint()); |
| 1853 |
/*
|
| 1854 |
* - get modified FAT
|
| 1855 |
* - compare the two FATs (TODO)
|
| 1856 |
* - get buffer for marking used clusters
|
| 1857 |
* - recurse direntries from root (using bs->bdrv_read to make
|
| 1858 |
* sure to get the new data)
|
| 1859 |
* - check that the FAT agrees with the size
|
| 1860 |
* - count the number of clusters occupied by this directory and
|
| 1861 |
* its files
|
| 1862 |
* - check that the cumulative used cluster count agrees with the
|
| 1863 |
* FAT
|
| 1864 |
* - if all is fine, return number of used clusters
|
| 1865 |
*/
|
| 1866 |
if (s->fat2 == NULL) { |
| 1867 |
int size = 0x200 * s->sectors_per_fat; |
| 1868 |
s->fat2 = malloc(size); |
| 1869 |
memcpy(s->fat2, s->fat.pointer, size); |
| 1870 |
} |
| 1871 |
check = vvfat_read(s->bs, |
| 1872 |
s->first_sectors_number, s->fat2, s->sectors_per_fat); |
| 1873 |
if (check) {
|
| 1874 |
fprintf(stderr, "Could not copy fat\n");
|
| 1875 |
return 0; |
| 1876 |
} |
| 1877 |
assert (s->used_clusters); |
| 1878 |
for (i = 0; i < sector2cluster(s, s->sector_count); i++) |
| 1879 |
s->used_clusters[i] &= ~USED_ANY; |
| 1880 |
|
| 1881 |
clear_commits(s); |
| 1882 |
|
| 1883 |
/* mark every mapped file/directory as deleted.
|
| 1884 |
* (check_directory_consistency() will unmark those still present). */
|
| 1885 |
if (s->qcow)
|
| 1886 |
for (i = 0; i < s->mapping.next; i++) { |
| 1887 |
mapping_t* mapping = array_get(&(s->mapping), i); |
| 1888 |
if (mapping->first_mapping_index < 0) |
| 1889 |
mapping->mode |= MODE_DELETED; |
| 1890 |
} |
| 1891 |
|
| 1892 |
used_clusters_count = check_directory_consistency(s, 0, s->path);
|
| 1893 |
if (used_clusters_count <= 0) { |
| 1894 |
DLOG(fprintf(stderr, "problem in directory\n"));
|
| 1895 |
return 0; |
| 1896 |
} |
| 1897 |
|
| 1898 |
check = s->last_cluster_of_root_directory; |
| 1899 |
for (i = check; i < sector2cluster(s, s->sector_count); i++) {
|
| 1900 |
if (modified_fat_get(s, i)) {
|
| 1901 |
if(!s->used_clusters[i]) {
|
| 1902 |
DLOG(fprintf(stderr, "FAT was modified (%d), but cluster is not used?\n", i));
|
| 1903 |
return 0; |
| 1904 |
} |
| 1905 |
check++; |
| 1906 |
} |
| 1907 |
|
| 1908 |
if (s->used_clusters[i] == USED_ALLOCATED) {
|
| 1909 |
/* allocated, but not used... */
|
| 1910 |
DLOG(fprintf(stderr, "unused, modified cluster: %d\n", i));
|
| 1911 |
return 0; |
| 1912 |
} |
| 1913 |
} |
| 1914 |
|
| 1915 |
if (check != used_clusters_count)
|
| 1916 |
return 0; |
| 1917 |
|
| 1918 |
return used_clusters_count;
|
| 1919 |
} |
| 1920 |
|
| 1921 |
static inline void adjust_mapping_indices(BDRVVVFATState* s, |
| 1922 |
int offset, int adjust) |
| 1923 |
{
|
| 1924 |
int i;
|
| 1925 |
|
| 1926 |
for (i = 0; i < s->mapping.next; i++) { |
| 1927 |
mapping_t* mapping = array_get(&(s->mapping), i); |
| 1928 |
|
| 1929 |
#define ADJUST_MAPPING_INDEX(name) \
|
| 1930 |
if (mapping->name >= offset) \
|
| 1931 |
mapping->name += adjust |
| 1932 |
|
| 1933 |
ADJUST_MAPPING_INDEX(first_mapping_index); |
| 1934 |
if (mapping->mode & MODE_DIRECTORY)
|
| 1935 |
ADJUST_MAPPING_INDEX(info.dir.parent_mapping_index); |
| 1936 |
} |
| 1937 |
} |
| 1938 |
|
| 1939 |
/* insert or update mapping */
|
| 1940 |
static mapping_t* insert_mapping(BDRVVVFATState* s,
|
| 1941 |
uint32_t begin, uint32_t end) |
| 1942 |
{
|
| 1943 |
/*
|
| 1944 |
* - find mapping where mapping->begin >= begin,
|
| 1945 |
* - if mapping->begin > begin: insert
|
| 1946 |
* - adjust all references to mappings!
|
| 1947 |
* - else: adjust
|
| 1948 |
* - replace name
|
| 1949 |
*/
|
| 1950 |
int index = find_mapping_for_cluster_aux(s, begin, 0, s->mapping.next); |
| 1951 |
mapping_t* mapping = NULL;
|
| 1952 |
mapping_t* first_mapping = array_get(&(s->mapping), 0);
|
| 1953 |
|
| 1954 |
if (index < s->mapping.next && (mapping = array_get(&(s->mapping), index))
|
| 1955 |
&& mapping->begin < begin) {
|
| 1956 |
mapping->end = begin; |
| 1957 |
index++; |
| 1958 |
mapping = array_get(&(s->mapping), index); |
| 1959 |
} |
| 1960 |
if (index >= s->mapping.next || mapping->begin > begin) {
|
| 1961 |
mapping = array_insert(&(s->mapping), index, 1);
|
| 1962 |
mapping->path = NULL;
|
| 1963 |
adjust_mapping_indices(s, index, +1);
|
| 1964 |
} |
| 1965 |
|
| 1966 |
mapping->begin = begin; |
| 1967 |
mapping->end = end; |
| 1968 |
|
| 1969 |
DLOG(mapping_t* next_mapping; |
| 1970 |
assert(index + 1 >= s->mapping.next ||
|
| 1971 |
((next_mapping = array_get(&(s->mapping), index + 1)) &&
|
| 1972 |
next_mapping->begin >= end))); |
| 1973 |
|
| 1974 |
if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
|
| 1975 |
s->current_mapping = array_get(&(s->mapping), |
| 1976 |
s->current_mapping - first_mapping); |
| 1977 |
|
| 1978 |
return mapping;
|
| 1979 |
} |
| 1980 |
|
| 1981 |
static int remove_mapping(BDRVVVFATState* s, int mapping_index) |
| 1982 |
{
|
| 1983 |
mapping_t* mapping = array_get(&(s->mapping), mapping_index); |
| 1984 |
mapping_t* first_mapping = array_get(&(s->mapping), 0);
|
| 1985 |
|
| 1986 |
/* free mapping */
|
| 1987 |
if (mapping->first_mapping_index < 0) |
| 1988 |
free(mapping->path); |
| 1989 |
|
| 1990 |
/* remove from s->mapping */
|
| 1991 |
array_remove(&(s->mapping), mapping_index); |
| 1992 |
|
| 1993 |
/* adjust all references to mappings */
|
| 1994 |
adjust_mapping_indices(s, mapping_index, -1);
|
| 1995 |
|
| 1996 |
if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
|
| 1997 |
s->current_mapping = array_get(&(s->mapping), |
| 1998 |
s->current_mapping - first_mapping); |
| 1999 |
|
| 2000 |
return 0; |
| 2001 |
} |
| 2002 |
|
| 2003 |
static void adjust_dirindices(BDRVVVFATState* s, int offset, int adjust) |
| 2004 |
{
|
| 2005 |
int i;
|
| 2006 |
for (i = 0; i < s->mapping.next; i++) { |
| 2007 |
mapping_t* mapping = array_get(&(s->mapping), i); |
| 2008 |
if (mapping->dir_index >= offset)
|
| 2009 |
mapping->dir_index += adjust; |
| 2010 |
if ((mapping->mode & MODE_DIRECTORY) &&
|
| 2011 |
mapping->info.dir.first_dir_index >= offset) |
| 2012 |
mapping->info.dir.first_dir_index += adjust; |
| 2013 |
} |
| 2014 |
} |
| 2015 |
|
| 2016 |
static direntry_t* insert_direntries(BDRVVVFATState* s,
|
| 2017 |
int dir_index, int count) |
| 2018 |
{
|
| 2019 |
/*
|
| 2020 |
* make room in s->directory,
|
| 2021 |
* adjust_dirindices
|
| 2022 |
*/
|
| 2023 |
direntry_t* result = array_insert(&(s->directory), dir_index, count); |
| 2024 |
if (result == NULL) |
| 2025 |
return NULL; |
| 2026 |
adjust_dirindices(s, dir_index, count); |
| 2027 |
return result;
|
| 2028 |
} |
| 2029 |
|
| 2030 |
static int remove_direntries(BDRVVVFATState* s, int dir_index, int count) |
| 2031 |
{
|
| 2032 |
int ret = array_remove_slice(&(s->directory), dir_index, count);
|
| 2033 |
if (ret)
|
| 2034 |
return ret;
|
| 2035 |
adjust_dirindices(s, dir_index, -count); |
| 2036 |
return 0; |
| 2037 |
} |
| 2038 |
|
| 2039 |
/*
|
| 2040 |
* Adapt the mappings of the cluster chain starting at first cluster
|
| 2041 |
* (i.e. if a file starts at first_cluster, the chain is followed according
|
| 2042 |
* to the modified fat, and the corresponding entries in s->mapping are
|
| 2043 |
* adjusted)
|
| 2044 |
*/
|
| 2045 |
static int commit_mappings(BDRVVVFATState* s, |
| 2046 |
uint32_t first_cluster, int dir_index)
|
| 2047 |
{
|
| 2048 |
mapping_t* mapping = find_mapping_for_cluster(s, first_cluster); |
| 2049 |
direntry_t* direntry = array_get(&(s->directory), dir_index); |
| 2050 |
uint32_t cluster = first_cluster; |
| 2051 |
|
| 2052 |
vvfat_close_current_file(s); |
| 2053 |
|
| 2054 |
assert(mapping); |
| 2055 |
assert(mapping->begin == first_cluster); |
| 2056 |
mapping->first_mapping_index = -1;
|
| 2057 |
mapping->dir_index = dir_index; |
| 2058 |
mapping->mode = (dir_index <= 0 || is_directory(direntry)) ?
|
| 2059 |
MODE_DIRECTORY : MODE_NORMAL; |
| 2060 |
|
| 2061 |
while (!fat_eof(s, cluster)) {
|
| 2062 |
uint32_t c, c1; |
| 2063 |
|
| 2064 |
for (c = cluster, c1 = modified_fat_get(s, c); c + 1 == c1; |
| 2065 |
c = c1, c1 = modified_fat_get(s, c1)); |
| 2066 |
|
| 2067 |
c++; |
| 2068 |
if (c > mapping->end) {
|
| 2069 |
int index = array_index(&(s->mapping), mapping);
|
| 2070 |
int i, max_i = s->mapping.next - index;
|
| 2071 |
for (i = 1; i < max_i && mapping[i].begin < c; i++); |
| 2072 |
while (--i > 0) |
| 2073 |
remove_mapping(s, index + 1);
|
| 2074 |
} |
| 2075 |
assert(mapping == array_get(&(s->mapping), s->mapping.next - 1)
|
| 2076 |
|| mapping[1].begin >= c);
|
| 2077 |
mapping->end = c; |
| 2078 |
|
| 2079 |
if (!fat_eof(s, c1)) {
|
| 2080 |
int i = find_mapping_for_cluster_aux(s, c1, 0, s->mapping.next); |
| 2081 |
mapping_t* next_mapping = i >= s->mapping.next ? NULL :
|
| 2082 |
array_get(&(s->mapping), i); |
| 2083 |
|
| 2084 |
if (next_mapping == NULL || next_mapping->begin > c1) { |
| 2085 |
int i1 = array_index(&(s->mapping), mapping);
|
| 2086 |
|
| 2087 |
next_mapping = insert_mapping(s, c1, c1+1);
|
| 2088 |
|
| 2089 |
if (c1 < c)
|
| 2090 |
i1++; |
| 2091 |
mapping = array_get(&(s->mapping), i1); |
| 2092 |
} |
| 2093 |
|
| 2094 |
next_mapping->dir_index = mapping->dir_index; |
| 2095 |
next_mapping->first_mapping_index = |
| 2096 |
mapping->first_mapping_index < 0 ?
|
| 2097 |
array_index(&(s->mapping), mapping) : |
| 2098 |
mapping->first_mapping_index; |
| 2099 |
next_mapping->path = mapping->path; |
| 2100 |
next_mapping->mode = mapping->mode; |
| 2101 |
next_mapping->read_only = mapping->read_only; |
| 2102 |
if (mapping->mode & MODE_DIRECTORY) {
|
| 2103 |
next_mapping->info.dir.parent_mapping_index = |
| 2104 |
mapping->info.dir.parent_mapping_index; |
| 2105 |
next_mapping->info.dir.first_dir_index = |
| 2106 |
mapping->info.dir.first_dir_index + |
| 2107 |
0x10 * s->sectors_per_cluster *
|
| 2108 |
(mapping->end - mapping->begin); |
| 2109 |
} else
|
| 2110 |
next_mapping->info.file.offset = mapping->info.file.offset + |
| 2111 |
mapping->end - mapping->begin; |
| 2112 |
|
| 2113 |
mapping = next_mapping; |
| 2114 |
} |
| 2115 |
|
| 2116 |
cluster = c1; |
| 2117 |
} |
| 2118 |
|
| 2119 |
return 0; |
| 2120 |
} |
| 2121 |
|
| 2122 |
static int commit_direntries(BDRVVVFATState* s, |
| 2123 |
int dir_index, int parent_mapping_index) |
| 2124 |
{
|
| 2125 |
direntry_t* direntry = array_get(&(s->directory), dir_index); |
| 2126 |
uint32_t first_cluster = dir_index == 0 ? 0 : begin_of_direntry(direntry); |
| 2127 |
mapping_t* mapping = find_mapping_for_cluster(s, first_cluster); |
| 2128 |
|
| 2129 |
int factor = 0x10 * s->sectors_per_cluster; |
| 2130 |
int old_cluster_count, new_cluster_count;
|
| 2131 |
int current_dir_index = mapping->info.dir.first_dir_index;
|
| 2132 |
int first_dir_index = current_dir_index;
|
| 2133 |
int ret, i;
|
| 2134 |
uint32_t c; |
| 2135 |
|
| 2136 |
DLOG(fprintf(stderr, "commit_direntries for %s, parent_mapping_index %d\n", mapping->path, parent_mapping_index));
|
| 2137 |
|
| 2138 |
assert(direntry); |
| 2139 |
assert(mapping); |
| 2140 |
assert(mapping->begin == first_cluster); |
| 2141 |
assert(mapping->info.dir.first_dir_index < s->directory.next); |
| 2142 |
assert(mapping->mode & MODE_DIRECTORY); |
| 2143 |
assert(dir_index == 0 || is_directory(direntry));
|
| 2144 |
|
| 2145 |
mapping->info.dir.parent_mapping_index = parent_mapping_index; |
| 2146 |
|
| 2147 |
if (first_cluster == 0) { |
| 2148 |
old_cluster_count = new_cluster_count = |
| 2149 |
s->last_cluster_of_root_directory; |
| 2150 |
} else {
|
| 2151 |
for (old_cluster_count = 0, c = first_cluster; !fat_eof(s, c); |
| 2152 |
c = fat_get(s, c)) |
| 2153 |
old_cluster_count++; |
| 2154 |
|
| 2155 |
for (new_cluster_count = 0, c = first_cluster; !fat_eof(s, c); |
| 2156 |
c = modified_fat_get(s, c)) |
| 2157 |
new_cluster_count++; |
| 2158 |
} |
| 2159 |
|
| 2160 |
if (new_cluster_count > old_cluster_count) {
|
| 2161 |
if (insert_direntries(s,
|
| 2162 |
current_dir_index + factor * old_cluster_count, |
| 2163 |
factor * (new_cluster_count - old_cluster_count)) == NULL)
|
| 2164 |
return -1; |
| 2165 |
} else if (new_cluster_count < old_cluster_count) |
| 2166 |
remove_direntries(s, |
| 2167 |
current_dir_index + factor * new_cluster_count, |
| 2168 |
factor * (old_cluster_count - new_cluster_count)); |
| 2169 |
|
| 2170 |
for (c = first_cluster; !fat_eof(s, c); c = modified_fat_get(s, c)) {
|
| 2171 |
void* direntry = array_get(&(s->directory), current_dir_index);
|
| 2172 |
int ret = vvfat_read(s->bs, cluster2sector(s, c), direntry,
|
| 2173 |
s->sectors_per_cluster); |
| 2174 |
if (ret)
|
| 2175 |
return ret;
|
| 2176 |
assert(!strncmp(s->directory.pointer, "QEMU", 4)); |
| 2177 |
current_dir_index += factor; |
| 2178 |
} |
| 2179 |
|
| 2180 |
ret = commit_mappings(s, first_cluster, dir_index); |
| 2181 |
if (ret)
|
| 2182 |
return ret;
|
| 2183 |
|
| 2184 |
/* recurse */
|
| 2185 |
for (i = 0; i < factor * new_cluster_count; i++) { |
| 2186 |
direntry = array_get(&(s->directory), first_dir_index + i); |
| 2187 |
if (is_directory(direntry) && !is_dot(direntry)) {
|
| 2188 |
mapping = find_mapping_for_cluster(s, first_cluster); |
| 2189 |
assert(mapping->mode & MODE_DIRECTORY); |
| 2190 |
ret = commit_direntries(s, first_dir_index + i, |
| 2191 |
array_index(&(s->mapping), mapping)); |
| 2192 |
if (ret)
|
| 2193 |
return ret;
|
| 2194 |
} |
| 2195 |
} |
| 2196 |
|
| 2197 |
return 0; |
| 2198 |
} |
| 2199 |
|
| 2200 |
/* commit one file (adjust contents, adjust mapping),
|
| 2201 |
return first_mapping_index */
|
| 2202 |
static int commit_one_file(BDRVVVFATState* s, |
| 2203 |
int dir_index, uint32_t offset)
|
| 2204 |
{
|
| 2205 |
direntry_t* direntry = array_get(&(s->directory), dir_index); |
| 2206 |
uint32_t c = begin_of_direntry(direntry); |
| 2207 |
uint32_t first_cluster = c; |
| 2208 |
mapping_t* mapping = find_mapping_for_cluster(s, c); |
| 2209 |
uint32_t size = filesize_of_direntry(direntry); |
| 2210 |
char* cluster = malloc(s->cluster_size);
|
| 2211 |
uint32_t i; |
| 2212 |
int fd = 0; |
| 2213 |
|
| 2214 |
assert(offset < size); |
| 2215 |
assert((offset % s->cluster_size) == 0);
|
| 2216 |
|
| 2217 |
for (i = s->cluster_size; i < offset; i += s->cluster_size)
|
| 2218 |
c = modified_fat_get(s, c); |
| 2219 |
|
| 2220 |
fd = open(mapping->path, O_RDWR | O_CREAT | O_BINARY, 0666);
|
| 2221 |
if (fd < 0) { |
| 2222 |
fprintf(stderr, "Could not open %s... (%s, %d)\n", mapping->path,
|
| 2223 |
strerror(errno), errno); |
| 2224 |
return fd;
|
| 2225 |
} |
| 2226 |
if (offset > 0) |
| 2227 |
if (lseek(fd, offset, SEEK_SET) != offset)
|
| 2228 |
return -3; |
| 2229 |
|
| 2230 |
while (offset < size) {
|
| 2231 |
uint32_t c1; |
| 2232 |
int rest_size = (size - offset > s->cluster_size ?
|
| 2233 |
s->cluster_size : size - offset); |
| 2234 |
int ret;
|
| 2235 |
|
| 2236 |
c1 = modified_fat_get(s, c); |
| 2237 |
|
| 2238 |
assert((size - offset == 0 && fat_eof(s, c)) ||
|
| 2239 |
(size > offset && c >=2 && !fat_eof(s, c)));
|
| 2240 |
assert(size >= 0);
|
| 2241 |
|
| 2242 |
ret = vvfat_read(s->bs, cluster2sector(s, c), |
| 2243 |
(uint8_t*)cluster, (rest_size + 0x1ff) / 0x200); |
| 2244 |
|
| 2245 |
if (ret < 0) |
| 2246 |
return ret;
|
| 2247 |
|
| 2248 |
if (write(fd, cluster, rest_size) < 0) |
| 2249 |
return -2; |
| 2250 |
|
| 2251 |
offset += rest_size; |
| 2252 |
c = c1; |
| 2253 |
} |
| 2254 |
|
| 2255 |
ftruncate(fd, size); |
| 2256 |
close(fd); |
| 2257 |
|
| 2258 |
return commit_mappings(s, first_cluster, dir_index);
|
| 2259 |
} |
| 2260 |
|
| 2261 |
#ifdef DEBUG
|
| 2262 |
/* test, if all mappings point to valid direntries */
|
| 2263 |
static void check1(BDRVVVFATState* s) |
| 2264 |
{
|
| 2265 |
int i;
|
| 2266 |
for (i = 0; i < s->mapping.next; i++) { |
| 2267 |
mapping_t* mapping = array_get(&(s->mapping), i); |
| 2268 |
if (mapping->mode & MODE_DELETED) {
|
| 2269 |
fprintf(stderr, "deleted\n");
|
| 2270 |
continue;
|
| 2271 |
} |
| 2272 |
assert(mapping->dir_index >= 0);
|
| 2273 |
assert(mapping->dir_index < s->directory.next); |
| 2274 |
direntry_t* direntry = array_get(&(s->directory), mapping->dir_index); |
| 2275 |
assert(mapping->begin == begin_of_direntry(direntry) || mapping->first_mapping_index >= 0);
|
| 2276 |
if (mapping->mode & MODE_DIRECTORY) {
|
| 2277 |
assert(mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster * (mapping->end - mapping->begin) <= s->directory.next);
|
| 2278 |
assert((mapping->info.dir.first_dir_index % (0x10 * s->sectors_per_cluster)) == 0); |
| 2279 |
} |
| 2280 |
} |
| 2281 |
} |
| 2282 |
|
| 2283 |
/* test, if all direntries have mappings */
|
| 2284 |
static void check2(BDRVVVFATState* s) |
| 2285 |
{
|
| 2286 |
int i;
|
| 2287 |
int first_mapping = -1; |
| 2288 |
|
| 2289 |
for (i = 0; i < s->directory.next; i++) { |
| 2290 |
direntry_t* direntry = array_get(&(s->directory), i); |
| 2291 |
|
| 2292 |
if (is_short_name(direntry) && begin_of_direntry(direntry)) {
|
| 2293 |
mapping_t* mapping = find_mapping_for_cluster(s, begin_of_direntry(direntry)); |
| 2294 |
assert(mapping); |
| 2295 |
assert(mapping->dir_index == i || is_dot(direntry)); |
| 2296 |
assert(mapping->begin == begin_of_direntry(direntry) || is_dot(direntry)); |
| 2297 |
} |
| 2298 |
|
| 2299 |
if ((i % (0x10 * s->sectors_per_cluster)) == 0) { |
| 2300 |
/* cluster start */
|
| 2301 |
int j, count = 0; |
| 2302 |
|
| 2303 |
for (j = 0; j < s->mapping.next; j++) { |
| 2304 |
mapping_t* mapping = array_get(&(s->mapping), j); |
| 2305 |
if (mapping->mode & MODE_DELETED)
|
| 2306 |
continue;
|
| 2307 |
if (mapping->mode & MODE_DIRECTORY) {
|
| 2308 |
if (mapping->info.dir.first_dir_index <= i && mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster > i) { |
| 2309 |
assert(++count == 1);
|
| 2310 |
if (mapping->first_mapping_index == -1) |
| 2311 |
first_mapping = array_index(&(s->mapping), mapping); |
| 2312 |
else
|
| 2313 |
assert(first_mapping == mapping->first_mapping_index); |
| 2314 |
if (mapping->info.dir.parent_mapping_index < 0) |
| 2315 |
assert(j == 0);
|
| 2316 |
else {
|
| 2317 |
mapping_t* parent = array_get(&(s->mapping), mapping->info.dir.parent_mapping_index); |
| 2318 |
assert(parent->mode & MODE_DIRECTORY); |
| 2319 |
assert(parent->info.dir.first_dir_index < mapping->info.dir.first_dir_index); |
| 2320 |
} |
| 2321 |
} |
| 2322 |
} |
| 2323 |
} |
| 2324 |
if (count == 0) |
| 2325 |
first_mapping = -1;
|
| 2326 |
} |
| 2327 |
} |
| 2328 |
} |
| 2329 |
#endif
|
| 2330 |
|
| 2331 |
static int handle_renames_and_mkdirs(BDRVVVFATState* s) |
| 2332 |
{
|
| 2333 |
int i;
|
| 2334 |
|
| 2335 |
#ifdef DEBUG
|
| 2336 |
fprintf(stderr, "handle_renames\n");
|
| 2337 |
for (i = 0; i < s->commits.next; i++) { |
| 2338 |
commit_t* commit = array_get(&(s->commits), i); |
| 2339 |
fprintf(stderr, "%d, %s (%d, %d)\n", i, commit->path ? commit->path : "(null)", commit->param.rename.cluster, commit->action); |
| 2340 |
} |
| 2341 |
#endif
|
| 2342 |
|
| 2343 |
for (i = 0; i < s->commits.next;) { |
| 2344 |
commit_t* commit = array_get(&(s->commits), i); |
| 2345 |
if (commit->action == ACTION_RENAME) {
|
| 2346 |
mapping_t* mapping = find_mapping_for_cluster(s, |
| 2347 |
commit->param.rename.cluster); |
| 2348 |
char* old_path = mapping->path;
|
| 2349 |
|
| 2350 |
assert(commit->path); |
| 2351 |
mapping->path = commit->path; |
| 2352 |
if (rename(old_path, mapping->path))
|
| 2353 |
return -2; |
| 2354 |
|
| 2355 |
if (mapping->mode & MODE_DIRECTORY) {
|
| 2356 |
int l1 = strlen(mapping->path);
|
| 2357 |
int l2 = strlen(old_path);
|
| 2358 |
int diff = l1 - l2;
|
| 2359 |
direntry_t* direntry = array_get(&(s->directory), |
| 2360 |
mapping->info.dir.first_dir_index); |
| 2361 |
uint32_t c = mapping->begin; |
| 2362 |
int i = 0; |
| 2363 |
|
| 2364 |
/* recurse */
|
| 2365 |
while (!fat_eof(s, c)) {
|
| 2366 |
do {
|
| 2367 |
direntry_t* d = direntry + i; |
| 2368 |
|
| 2369 |
if (is_file(d) || (is_directory(d) && !is_dot(d))) {
|
| 2370 |
mapping_t* m = find_mapping_for_cluster(s, |
| 2371 |
begin_of_direntry(d)); |
| 2372 |
int l = strlen(m->path);
|
| 2373 |
char* new_path = malloc(l + diff + 1); |
| 2374 |
|
| 2375 |
assert(!strncmp(m->path, mapping->path, l2)); |
| 2376 |
|
| 2377 |
strcpy(new_path, mapping->path); |
| 2378 |
strcpy(new_path + l1, m->path + l2); |
| 2379 |
|
| 2380 |
schedule_rename(s, m->begin, new_path); |
| 2381 |
} |
| 2382 |
i++; |
| 2383 |
} while((i % (0x10 * s->sectors_per_cluster)) != 0); |
| 2384 |
c = fat_get(s, c); |
| 2385 |
} |
| 2386 |
} |
| 2387 |
|
| 2388 |
free(old_path); |
| 2389 |
array_remove(&(s->commits), i); |
| 2390 |
continue;
|
| 2391 |
} else if (commit->action == ACTION_MKDIR) { |
| 2392 |
mapping_t* mapping; |
| 2393 |
int j, parent_path_len;
|
| 2394 |
|
| 2395 |
#ifdef __MINGW32__
|
| 2396 |
if (mkdir(commit->path))
|
| 2397 |
return -5; |
| 2398 |
#else
|
| 2399 |
if (mkdir(commit->path, 0755)) |
| 2400 |
return -5; |
| 2401 |
#endif
|
| 2402 |
|
| 2403 |
mapping = insert_mapping(s, commit->param.mkdir.cluster, |
| 2404 |
commit->param.mkdir.cluster + 1);
|
| 2405 |
if (mapping == NULL) |
| 2406 |
return -6; |
| 2407 |
|
| 2408 |
mapping->mode = MODE_DIRECTORY; |
| 2409 |
mapping->read_only = 0;
|
| 2410 |
mapping->path = commit->path; |
| 2411 |
j = s->directory.next; |
| 2412 |
assert(j); |
| 2413 |
insert_direntries(s, s->directory.next, |
| 2414 |
0x10 * s->sectors_per_cluster);
|
| 2415 |
mapping->info.dir.first_dir_index = j; |
| 2416 |
|
| 2417 |
parent_path_len = strlen(commit->path) |
| 2418 |
- strlen(get_basename(commit->path)) - 1;
|
| 2419 |
for (j = 0; j < s->mapping.next; j++) { |
| 2420 |
mapping_t* m = array_get(&(s->mapping), j); |
| 2421 |
if (m->first_mapping_index < 0 && m != mapping && |
| 2422 |
!strncmp(m->path, mapping->path, parent_path_len) && |
| 2423 |
strlen(m->path) == parent_path_len) |
| 2424 |
break;
|
| 2425 |
} |
| 2426 |
assert(j < s->mapping.next); |
| 2427 |
mapping->info.dir.parent_mapping_index = j; |
| 2428 |
|
| 2429 |
array_remove(&(s->commits), i); |
| 2430 |
continue;
|
| 2431 |
} |
| 2432 |
|
| 2433 |
i++; |
| 2434 |
} |
| 2435 |
return 0; |
| 2436 |
} |
| 2437 |
|
| 2438 |
/*
|
| 2439 |
* TODO: make sure that the short name is not matching *another* file
|
| 2440 |
*/
|
| 2441 |
static int handle_commits(BDRVVVFATState* s) |
| 2442 |
{
|
| 2443 |
int i, fail = 0; |
| 2444 |
|
| 2445 |
vvfat_close_current_file(s); |
| 2446 |
|
| 2447 |
for (i = 0; !fail && i < s->commits.next; i++) { |
| 2448 |
commit_t* commit = array_get(&(s->commits), i); |
| 2449 |
switch(commit->action) {
|
| 2450 |
case ACTION_RENAME: case ACTION_MKDIR: |
| 2451 |
assert(0);
|
| 2452 |
fail = -2;
|
| 2453 |
break;
|
| 2454 |
case ACTION_WRITEOUT: {
|
| 2455 |
direntry_t* entry = array_get(&(s->directory), |
| 2456 |
commit->param.writeout.dir_index); |
| 2457 |
uint32_t begin = begin_of_direntry(entry); |
| 2458 |
mapping_t* mapping = find_mapping_for_cluster(s, begin); |
| 2459 |
|
| 2460 |
assert(mapping); |
| 2461 |
assert(mapping->begin == begin); |
| 2462 |
assert(commit->path == NULL);
|
| 2463 |
|
| 2464 |
if (commit_one_file(s, commit->param.writeout.dir_index,
|
| 2465 |
commit->param.writeout.modified_offset)) |
| 2466 |
fail = -3;
|
| 2467 |
|
| 2468 |
break;
|
| 2469 |
} |
| 2470 |
case ACTION_NEW_FILE: {
|
| 2471 |
int begin = commit->param.new_file.first_cluster;
|
| 2472 |
mapping_t* mapping = find_mapping_for_cluster(s, begin); |
| 2473 |
direntry_t* entry; |
| 2474 |
int i;
|
| 2475 |
|
| 2476 |
/* find direntry */
|
| 2477 |
for (i = 0; i < s->directory.next; i++) { |
| 2478 |
entry = array_get(&(s->directory), i); |
| 2479 |
if (is_file(entry) && begin_of_direntry(entry) == begin)
|
| 2480 |
break;
|
| 2481 |
} |
| 2482 |
|
| 2483 |
if (i >= s->directory.next) {
|
| 2484 |
fail = -6;
|
| 2485 |
continue;
|
| 2486 |
} |
| 2487 |
|
| 2488 |
/* make sure there exists an initial mapping */
|
| 2489 |
if (mapping && mapping->begin != begin) {
|
| 2490 |
mapping->end = begin; |
| 2491 |
mapping = NULL;
|
| 2492 |
} |
| 2493 |
if (mapping == NULL) { |
| 2494 |
mapping = insert_mapping(s, begin, begin+1);
|
| 2495 |
} |
| 2496 |
/* most members will be fixed in commit_mappings() */
|
| 2497 |
assert(commit->path); |
| 2498 |
mapping->path = commit->path; |
| 2499 |
mapping->read_only = 0;
|
| 2500 |
mapping->mode = MODE_NORMAL; |
| 2501 |
mapping->info.file.offset = 0;
|
| 2502 |
|
| 2503 |
if (commit_one_file(s, i, 0)) |
| 2504 |
fail = -7;
|
| 2505 |
|
| 2506 |
break;
|
| 2507 |
} |
| 2508 |
default:
|
| 2509 |
assert(0);
|
| 2510 |
} |
| 2511 |
} |
| 2512 |
if (i > 0 && array_remove_slice(&(s->commits), 0, i)) |
| 2513 |
return -1; |
| 2514 |
return fail;
|
| 2515 |
} |
| 2516 |
|
| 2517 |
static int handle_deletes(BDRVVVFATState* s) |
| 2518 |
{
|
| 2519 |
int i, deferred = 1, deleted = 1; |
| 2520 |
|
| 2521 |
/* delete files corresponding to mappings marked as deleted */
|
| 2522 |
/* handle DELETEs and unused mappings (modified_fat_get(s, mapping->begin) == 0) */
|
| 2523 |
while (deferred && deleted) {
|
| 2524 |
deferred = 0;
|
| 2525 |
deleted = 0;
|
| 2526 |
|
| 2527 |
for (i = 1; i < s->mapping.next; i++) { |
| 2528 |
mapping_t* mapping = array_get(&(s->mapping), i); |
| 2529 |
if (mapping->mode & MODE_DELETED) {
|
| 2530 |
direntry_t* entry = array_get(&(s->directory), |
| 2531 |
mapping->dir_index); |
| 2532 |
|
| 2533 |
if (is_free(entry)) {
|
| 2534 |
/* remove file/directory */
|
| 2535 |
if (mapping->mode & MODE_DIRECTORY) {
|
| 2536 |
int j, next_dir_index = s->directory.next,
|
| 2537 |
first_dir_index = mapping->info.dir.first_dir_index; |
| 2538 |
|
| 2539 |
if (rmdir(mapping->path) < 0) { |
| 2540 |
if (errno == ENOTEMPTY) {
|
| 2541 |
deferred++; |
| 2542 |
continue;
|
| 2543 |
} else
|
| 2544 |
return -5; |
| 2545 |
} |
| 2546 |
|
| 2547 |
for (j = 1; j < s->mapping.next; j++) { |
| 2548 |
mapping_t* m = array_get(&(s->mapping), j); |
| 2549 |
if (m->mode & MODE_DIRECTORY &&
|
| 2550 |
m->info.dir.first_dir_index > |
| 2551 |
first_dir_index && |
| 2552 |
m->info.dir.first_dir_index < |
| 2553 |
next_dir_index) |
| 2554 |
next_dir_index = |
| 2555 |
m->info.dir.first_dir_index; |
| 2556 |
} |
| 2557 |
remove_direntries(s, first_dir_index, |
| 2558 |
next_dir_index - first_dir_index); |
| 2559 |
|
| 2560 |
deleted++; |
| 2561 |
} |
| 2562 |
} else {
|
| 2563 |
if (unlink(mapping->path))
|
| 2564 |
return -4; |
| 2565 |
deleted++; |
| 2566 |
} |
| 2567 |
DLOG(fprintf(stderr, "DELETE (%d)\n", i); print_mapping(mapping); print_direntry(entry));
|
| 2568 |
remove_mapping(s, i); |
| 2569 |
} |
| 2570 |
} |
| 2571 |
} |
| 2572 |
|
| 2573 |
return 0; |
| 2574 |
} |
| 2575 |
|
| 2576 |
/*
|
| 2577 |
* synchronize mapping with new state:
|
| 2578 |
*
|
| 2579 |
* - copy FAT (with bdrv_read)
|
| 2580 |
* - mark all filenames corresponding to mappings as deleted
|
| 2581 |
* - recurse direntries from root (using bs->bdrv_read)
|
| 2582 |
* - delete files corresponding to mappings marked as deleted
|
| 2583 |
*/
|
| 2584 |
static int do_commit(BDRVVVFATState* s) |
| 2585 |
{
|
| 2586 |
int ret = 0; |
| 2587 |
|
| 2588 |
/* the real meat are the commits. Nothing to do? Move along! */
|
| 2589 |
if (s->commits.next == 0) |
| 2590 |
return 0; |
| 2591 |
|
| 2592 |
vvfat_close_current_file(s); |
| 2593 |
|
| 2594 |
ret = handle_renames_and_mkdirs(s); |
| 2595 |
if (ret) {
|
| 2596 |
fprintf(stderr, "Error handling renames (%d)\n", ret);
|
| 2597 |
assert(0);
|
| 2598 |
return ret;
|
| 2599 |
} |
| 2600 |
|
| 2601 |
/* copy FAT (with bdrv_read) */
|
| 2602 |
memcpy(s->fat.pointer, s->fat2, 0x200 * s->sectors_per_fat);
|
| 2603 |
|
| 2604 |
/* recurse direntries from root (using bs->bdrv_read) */
|
| 2605 |
ret = commit_direntries(s, 0, -1); |
| 2606 |
if (ret) {
|
| 2607 |
fprintf(stderr, "Fatal: error while committing (%d)\n", ret);
|
| 2608 |
assert(0);
|
| 2609 |
return ret;
|
| 2610 |
} |
| 2611 |
|
| 2612 |
ret = handle_commits(s); |
| 2613 |
if (ret) {
|
| 2614 |
fprintf(stderr, "Error handling commits (%d)\n", ret);
|
| 2615 |
assert(0);
|
| 2616 |
return ret;
|
| 2617 |
} |
| 2618 |
|
| 2619 |
ret = handle_deletes(s); |
| 2620 |
if (ret) {
|
| 2621 |
fprintf(stderr, "Error deleting\n");
|
| 2622 |
assert(0);
|
| 2623 |
return ret;
|
| 2624 |
} |
| 2625 |
|
| 2626 |
s->qcow->drv->bdrv_make_empty(s->qcow); |
| 2627 |
|
| 2628 |
memset(s->used_clusters, 0, sector2cluster(s, s->sector_count));
|
| 2629 |
|
| 2630 |
DLOG(checkpoint()); |
| 2631 |
return 0; |
| 2632 |
} |
| 2633 |
|
| 2634 |
static int try_commit(BDRVVVFATState* s) |
| 2635 |
{
|
| 2636 |
vvfat_close_current_file(s); |
| 2637 |
DLOG(checkpoint()); |
| 2638 |
if(!is_consistent(s))
|
| 2639 |
return -1; |
| 2640 |
return do_commit(s);
|
| 2641 |
} |
| 2642 |
|
| 2643 |
static int vvfat_write(BlockDriverState *bs, int64_t sector_num, |
| 2644 |
const uint8_t *buf, int nb_sectors) |
| 2645 |
{
|
| 2646 |
BDRVVVFATState *s = bs->opaque; |
| 2647 |
int i, ret;
|
| 2648 |
|
| 2649 |
DLOG(checkpoint()); |
| 2650 |
|
| 2651 |
vvfat_close_current_file(s); |
| 2652 |
|
| 2653 |
/*
|
| 2654 |
* Some sanity checks:
|
| 2655 |
* - do not allow writing to the boot sector
|
| 2656 |
* - do not allow to write non-ASCII filenames
|
| 2657 |
*/
|
| 2658 |
|
| 2659 |
if (sector_num < s->first_sectors_number)
|
| 2660 |
return -1; |
| 2661 |
|
| 2662 |
for (i = sector2cluster(s, sector_num);
|
| 2663 |
i <= sector2cluster(s, sector_num + nb_sectors - 1);) {
|
| 2664 |
mapping_t* mapping = find_mapping_for_cluster(s, i); |
| 2665 |
if (mapping) {
|
| 2666 |
if (mapping->read_only) {
|
| 2667 |
fprintf(stderr, "Tried to write to write-protected file %s\n",
|
| 2668 |
mapping->path); |
| 2669 |
return -1; |
| 2670 |
} |
| 2671 |
|
| 2672 |
if (mapping->mode & MODE_DIRECTORY) {
|
| 2673 |
int begin = cluster2sector(s, i);
|
| 2674 |
int end = begin + s->sectors_per_cluster, k;
|
| 2675 |
int dir_index;
|
| 2676 |
const direntry_t* direntries;
|
| 2677 |
long_file_name lfn; |
| 2678 |
|
| 2679 |
lfn_init(&lfn); |
| 2680 |
|
| 2681 |
if (begin < sector_num)
|
| 2682 |
begin = sector_num; |
| 2683 |
if (end > sector_num + nb_sectors)
|
| 2684 |
end = sector_num + nb_sectors; |
| 2685 |
dir_index = mapping->dir_index + |
| 2686 |
0x10 * (begin - mapping->begin * s->sectors_per_cluster);
|
| 2687 |
direntries = (direntry_t*)(buf + 0x200 * (begin - sector_num));
|
| 2688 |
|
| 2689 |
for (k = 0; k < (end - begin) * 0x10; k++) { |
| 2690 |
/* do not allow non-ASCII filenames */
|
| 2691 |
if (parse_long_name(&lfn, direntries + k) < 0) { |
| 2692 |
fprintf(stderr, "Warning: non-ASCII filename\n");
|
| 2693 |
return -1; |
| 2694 |
} |
| 2695 |
/* no access to the direntry of a read-only file */
|
| 2696 |
else if (is_short_name(direntries+k) && |
| 2697 |
(direntries[k].attributes & 1)) {
|
| 2698 |
if (memcmp(direntries + k,
|
| 2699 |
array_get(&(s->directory), dir_index + k), |
| 2700 |
sizeof(direntry_t))) {
|
| 2701 |
fprintf(stderr, "Warning: tried to write to write-protected file\n");
|
| 2702 |
return -1; |
| 2703 |
} |
| 2704 |
} |
| 2705 |
} |
| 2706 |
} |
| 2707 |
i = mapping->end; |
| 2708 |
} else
|
| 2709 |
i++; |
| 2710 |
} |
| 2711 |
|
| 2712 |
/*
|
| 2713 |
* Use qcow backend. Commit later.
|
| 2714 |
*/
|
| 2715 |
DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors)); |
| 2716 |
ret = s->qcow->drv->bdrv_write(s->qcow, sector_num, buf, nb_sectors); |
| 2717 |
if (ret < 0) { |
| 2718 |
fprintf(stderr, "Error writing to qcow backend\n");
|
| 2719 |
return ret;
|
| 2720 |
} |
| 2721 |
|
| 2722 |
for (i = sector2cluster(s, sector_num);
|
| 2723 |
i <= sector2cluster(s, sector_num + nb_sectors - 1); i++)
|
| 2724 |
if (i >= 0) |
| 2725 |
s->used_clusters[i] |= USED_ALLOCATED; |
| 2726 |
|
| 2727 |
DLOG(checkpoint()); |
| 2728 |
/* TODO: add timeout */
|
| 2729 |
try_commit(s); |
| 2730 |
|
| 2731 |
DLOG(checkpoint()); |
| 2732 |
return 0; |
| 2733 |
} |
| 2734 |
|
| 2735 |
static int vvfat_is_allocated(BlockDriverState *bs, |
| 2736 |
int64_t sector_num, int nb_sectors, int* n) |
| 2737 |
{
|
| 2738 |
BDRVVVFATState* s = bs->opaque; |
| 2739 |
*n = s->sector_count - sector_num; |
| 2740 |
if (*n > nb_sectors)
|
| 2741 |
*n = nb_sectors; |
| 2742 |
else if (*n < 0) |
| 2743 |
return 0; |
| 2744 |
return 1; |
| 2745 |
} |
| 2746 |
|
| 2747 |
static int write_target_commit(BlockDriverState *bs, int64_t sector_num, |
| 2748 |
const uint8_t* buffer, int nb_sectors) { |
| 2749 |
BDRVVVFATState* s = bs->opaque; |
| 2750 |
return try_commit(s);
|
| 2751 |
} |
| 2752 |
|
| 2753 |
static void write_target_close(BlockDriverState *bs) { |
| 2754 |
BDRVVVFATState* s = bs->opaque; |
| 2755 |
bdrv_delete(s->qcow); |
| 2756 |
free(s->qcow_filename); |
| 2757 |
} |
| 2758 |
|
| 2759 |
static BlockDriver vvfat_write_target = {
|
| 2760 |
"vvfat_write_target", 0, NULL, NULL, NULL, |
| 2761 |
write_target_commit, |
| 2762 |
write_target_close, |
| 2763 |
NULL, NULL, NULL |
| 2764 |
}; |
| 2765 |
|
| 2766 |
static int enable_write_target(BDRVVVFATState *s) |
| 2767 |
{
|
| 2768 |
int size = sector2cluster(s, s->sector_count);
|
| 2769 |
s->used_clusters = calloc(size, 1);
|
| 2770 |
|
| 2771 |
array_init(&(s->commits), sizeof(commit_t));
|
| 2772 |
|
| 2773 |
s->qcow_filename = malloc(1024);
|
| 2774 |
get_tmp_filename(s->qcow_filename, 1024);
|
| 2775 |
if (bdrv_create(&bdrv_qcow,
|
| 2776 |
s->qcow_filename, s->sector_count, "fat:", 0) < 0) |
| 2777 |
return -1; |
| 2778 |
s->qcow = bdrv_new("");
|
| 2779 |
if (s->qcow == NULL || bdrv_open(s->qcow, s->qcow_filename, 0) < 0) |
| 2780 |
return -1; |
| 2781 |
|
| 2782 |
#ifndef _WIN32
|
| 2783 |
unlink(s->qcow_filename); |
| 2784 |
#endif
|
| 2785 |
|
| 2786 |
s->bs->backing_hd = calloc(sizeof(BlockDriverState), 1); |
| 2787 |
s->bs->backing_hd->drv = &vvfat_write_target; |
| 2788 |
s->bs->backing_hd->opaque = s; |
| 2789 |
|
| 2790 |
return 0; |
| 2791 |
} |
| 2792 |
|
| 2793 |
static void vvfat_close(BlockDriverState *bs) |
| 2794 |
{
|
| 2795 |
BDRVVVFATState *s = bs->opaque; |
| 2796 |
|
| 2797 |
vvfat_close_current_file(s); |
| 2798 |
array_free(&(s->fat)); |
| 2799 |
array_free(&(s->directory)); |
| 2800 |
array_free(&(s->mapping)); |
| 2801 |
if(s->cluster_buffer)
|
| 2802 |
free(s->cluster_buffer); |
| 2803 |
} |
| 2804 |
|
| 2805 |
BlockDriver bdrv_vvfat = {
|
| 2806 |
"vvfat",
|
| 2807 |
sizeof(BDRVVVFATState),
|
| 2808 |
NULL, /* no probe for protocols */ |
| 2809 |
vvfat_open, |
| 2810 |
vvfat_read, |
| 2811 |
vvfat_write, |
| 2812 |
vvfat_close, |
| 2813 |
NULL, /* ??? Not sure if we can do any meaningful flushing. */ |
| 2814 |
NULL,
|
| 2815 |
vvfat_is_allocated, |
| 2816 |
.protocol_name = "fat",
|
| 2817 |
}; |
| 2818 |
|
| 2819 |
#ifdef DEBUG
|
| 2820 |
static void checkpoint(void) { |
| 2821 |
assert(((mapping_t*)array_get(&(vvv->mapping), 0))->end == 2); |
| 2822 |
check1(vvv); |
| 2823 |
check2(vvv); |
| 2824 |
assert(!vvv->current_mapping || vvv->current_fd || (vvv->current_mapping->mode & MODE_DIRECTORY)); |
| 2825 |
#if 0
|
| 2826 |
if (((direntry_t*)vvv->directory.pointer)[1].attributes != 0xf)
|
| 2827 |
fprintf(stderr, "Nonono!\n");
|
| 2828 |
mapping_t* mapping;
|
| 2829 |
direntry_t* direntry;
|
| 2830 |
assert(vvv->mapping.size >= vvv->mapping.item_size * vvv->mapping.next);
|
| 2831 |
assert(vvv->directory.size >= vvv->directory.item_size * vvv->directory.next);
|
| 2832 |
if (vvv->mapping.next<47)
|
| 2833 |
return;
|
| 2834 |
assert((mapping = array_get(&(vvv->mapping), 47)));
|
| 2835 |
assert(mapping->dir_index < vvv->directory.next);
|
| 2836 |
direntry = array_get(&(vvv->directory), mapping->dir_index);
|
| 2837 |
assert(!memcmp(direntry->name, "USB H ", 11) || direntry->name[0]==0);
|
| 2838 |
#endif
|
| 2839 |
return;
|
| 2840 |
/* avoid compiler warnings: */
|
| 2841 |
hexdump(NULL, 100); |
| 2842 |
remove_mapping(vvv, NULL);
|
| 2843 |
print_mapping(NULL);
|
| 2844 |
print_direntry(NULL);
|
| 2845 |
} |
| 2846 |
#endif
|
| 2847 |
|