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- update redolog image position with lseek() if the read/write access is not

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handled by the volatile redolog (fixes tests with Windows XP)
- allow volatile write to boot sector
This commit is contained in:
Volker Ruppert 2011-12-31 12:51:07 +00:00
parent 46d8a5894e
commit afef1e621e
1 changed files with 11 additions and 1 deletions
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12
bochs/iodev/vvfat.cc
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@ -1909,7 +1909,7 @@ ssize_t vvfat_image_t::read(void* buf, size_t count)
Bit32u scount = (Bit32u)(count / 0x200);
while (scount-- > 0) {
if ((size_t)redolog->read(cbuf, 0x200) != 0x200) {
if ((ssize_t)redolog->read(cbuf, 0x200) != 0x200) {
if (sector_num < offset_to_data) {
if (sector_num < (offset_to_bootsector + reserved_sectors))
memcpy(cbuf, &first_sectors[sector_num * 0x200], 0x200);
@ -1929,6 +1929,7 @@ ssize_t vvfat_image_t::read(void* buf, size_t count)
memcpy(cbuf, cluster + sector_offset_in_cluster * 0x200, 0x200);
}
}
redolog->lseek((sector_num + 1) * 0x200, SEEK_SET);
}
sector_num++;
cbuf += 0x200;
@ -1941,11 +1942,16 @@ ssize_t vvfat_image_t::write(const void* buf, size_t count)
ssize_t ret = 0;
char *cbuf = (char*)buf;
Bit32u scount = (Bit32u)(count / 512);
bx_bool update_imagepos;
while (scount-- > 0) {
update_imagepos = 1;
if (sector_num == 0) {
// allow writing to MBR (except partition table)
memcpy(&first_sectors[0], cbuf, 0x1b8);
} else if (sector_num == offset_to_bootsector) {
// allow writing to boot sector
memcpy(&first_sectors[sector_num * 0x200], cbuf, 0x200);
} else if ((fat_type == 32) && (sector_num == (offset_to_bootsector + 1))) {
// allow writing to FS info sector
memcpy(&first_sectors[sector_num * 0x200], cbuf, 0x200);
@ -1954,11 +1960,15 @@ ssize_t vvfat_image_t::write(const void* buf, size_t count)
ret = -1;
} else {
vvfat_modified = 1;
update_imagepos = 0;
ret = redolog->write(cbuf, 0x200);
}
if (ret < 0) break;
sector_num++;
cbuf += 0x200;
if (update_imagepos) {
redolog->lseek(sector_num * 0x200, SEEK_SET);
}
}
return (ret < 0) ? ret : count;
}