vvfat.c (7267c0947d7e8ae5dff7bafd932c3bc285f43e5c) vvfat.c (541dc0d47f10973c241e9955afc2aefc96adec51)
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

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195{
196 size_t offset = (char*)pointer - array->pointer;
197 assert((offset % array->item_size) == 0);
198 assert(offset/array->item_size < array->next);
199 return offset/array->item_size;
200}
201
202/* These structures are used to fake a disk and the VFAT filesystem.
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

--- 186 unchanged lines hidden (view full) ---

195{
196 size_t offset = (char*)pointer - array->pointer;
197 assert((offset % array->item_size) == 0);
198 assert(offset/array->item_size < array->next);
199 return offset/array->item_size;
200}
201
202/* These structures are used to fake a disk and the VFAT filesystem.
203 * For this reason we need to use __attribute__((packed)). */
203 * For this reason we need to use QEMU_PACKED. */
204
205typedef struct bootsector_t {
206 uint8_t jump[3];
207 uint8_t name[8];
208 uint16_t sector_size;
209 uint8_t sectors_per_cluster;
210 uint16_t reserved_sectors;
211 uint8_t number_of_fats;

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219 uint32_t total_sectors;
220 union {
221 struct {
222 uint8_t drive_number;
223 uint8_t current_head;
224 uint8_t signature;
225 uint32_t id;
226 uint8_t volume_label[11];
204
205typedef struct bootsector_t {
206 uint8_t jump[3];
207 uint8_t name[8];
208 uint16_t sector_size;
209 uint8_t sectors_per_cluster;
210 uint16_t reserved_sectors;
211 uint8_t number_of_fats;

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219 uint32_t total_sectors;
220 union {
221 struct {
222 uint8_t drive_number;
223 uint8_t current_head;
224 uint8_t signature;
225 uint32_t id;
226 uint8_t volume_label[11];
227 } __attribute__((packed)) fat16;
227 } QEMU_PACKED fat16;
228 struct {
229 uint32_t sectors_per_fat;
230 uint16_t flags;
231 uint8_t major,minor;
232 uint32_t first_cluster_of_root_directory;
233 uint16_t info_sector;
234 uint16_t backup_boot_sector;
235 uint16_t ignored;
228 struct {
229 uint32_t sectors_per_fat;
230 uint16_t flags;
231 uint8_t major,minor;
232 uint32_t first_cluster_of_root_directory;
233 uint16_t info_sector;
234 uint16_t backup_boot_sector;
235 uint16_t ignored;
236 } __attribute__((packed)) fat32;
236 } QEMU_PACKED fat32;
237 } u;
238 uint8_t fat_type[8];
239 uint8_t ignored[0x1c0];
240 uint8_t magic[2];
237 } u;
238 uint8_t fat_type[8];
239 uint8_t ignored[0x1c0];
240 uint8_t magic[2];
241} __attribute__((packed)) bootsector_t;
241} QEMU_PACKED bootsector_t;
242
243typedef struct {
244 uint8_t head;
245 uint8_t sector;
246 uint8_t cylinder;
247} mbr_chs_t;
248
249typedef struct partition_t {
250 uint8_t attributes; /* 0x80 = bootable */
251 mbr_chs_t start_CHS;
252 uint8_t fs_type; /* 0x1 = FAT12, 0x6 = FAT16, 0xe = FAT16_LBA, 0xb = FAT32, 0xc = FAT32_LBA */
253 mbr_chs_t end_CHS;
254 uint32_t start_sector_long;
255 uint32_t length_sector_long;
242
243typedef struct {
244 uint8_t head;
245 uint8_t sector;
246 uint8_t cylinder;
247} mbr_chs_t;
248
249typedef struct partition_t {
250 uint8_t attributes; /* 0x80 = bootable */
251 mbr_chs_t start_CHS;
252 uint8_t fs_type; /* 0x1 = FAT12, 0x6 = FAT16, 0xe = FAT16_LBA, 0xb = FAT32, 0xc = FAT32_LBA */
253 mbr_chs_t end_CHS;
254 uint32_t start_sector_long;
255 uint32_t length_sector_long;
256} __attribute__((packed)) partition_t;
256} QEMU_PACKED partition_t;
257
258typedef struct mbr_t {
259 uint8_t ignored[0x1b8];
260 uint32_t nt_id;
261 uint8_t ignored2[2];
262 partition_t partition[4];
263 uint8_t magic[2];
257
258typedef struct mbr_t {
259 uint8_t ignored[0x1b8];
260 uint32_t nt_id;
261 uint8_t ignored2[2];
262 partition_t partition[4];
263 uint8_t magic[2];
264} __attribute__((packed)) mbr_t;
264} QEMU_PACKED mbr_t;
265
266typedef struct direntry_t {
267 uint8_t name[8];
268 uint8_t extension[3];
269 uint8_t attributes;
270 uint8_t reserved[2];
271 uint16_t ctime;
272 uint16_t cdate;
273 uint16_t adate;
274 uint16_t begin_hi;
275 uint16_t mtime;
276 uint16_t mdate;
277 uint16_t begin;
278 uint32_t size;
265
266typedef struct direntry_t {
267 uint8_t name[8];
268 uint8_t extension[3];
269 uint8_t attributes;
270 uint8_t reserved[2];
271 uint16_t ctime;
272 uint16_t cdate;
273 uint16_t adate;
274 uint16_t begin_hi;
275 uint16_t mtime;
276 uint16_t mdate;
277 uint16_t begin;
278 uint32_t size;
279} __attribute__((packed)) direntry_t;
279} QEMU_PACKED direntry_t;
280
281/* this structure are used to transparently access the files */
282
283typedef struct mapping_t {
284 /* begin is the first cluster, end is the last+1 */
285 uint32_t begin,end;
286 /* as s->directory is growable, no pointer may be used here */
287 unsigned int dir_index;

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281/* this structure are used to transparently access the files */
282
283typedef struct mapping_t {
284 /* begin is the first cluster, end is the last+1 */
285 uint32_t begin,end;
286 /* as s->directory is growable, no pointer may be used here */
287 unsigned int dir_index;

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