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emummc: fix file-based accesses that cross file boundaries

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This commit is contained in:
Michael Scire 2021-05-05 08:29:53 -07:00
parent 0a11cbc2d6
commit 972681c57e
1 changed files with 29 additions and 0 deletions
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29
emummc/source/emuMMC/emummc.c
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@ -292,6 +292,35 @@ static uint64_t emummc_read_write_inner(void *buf, unsigned int sector, unsigned
{ {
fp = &f_emu.fp_gpp[sector / f_emu.part_size]; fp = &f_emu.fp_gpp[sector / f_emu.part_size];
sector = sector % f_emu.part_size; sector = sector % f_emu.part_size;
// Special handling for reads/writes which cross file-boundaries.
if (__builtin_expect(sector + num_sectors > f_emu.part_size, 0))
{
unsigned int remaining = num_sectors;
while (remaining > 0) {
const unsigned int cur_sectors = MIN(remaining, f_emu.part_size - sector);
if (f_lseek(fp, sector << 9) != FR_OK)
return 0; // Out of bounds.
if (is_write)
{
if (f_write_fast(fp, buf, cur_sectors << 9) != FR_OK)
return 0;
}
else
{
if (f_read_fast(fp, buf, cur_sectors << 9) != FR_OK)
return 0;
}
remaining -= cur_sectors;
sector = 0;
++fp;
}
return 1;
}
} }
else else
{ {