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emummc: fix file-based accesses that cross file boundaries
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1 changed files with 29 additions and 0 deletions
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@ -292,6 +292,35 @@ static uint64_t emummc_read_write_inner(void *buf, unsigned int sector, unsigned
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{
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fp = &f_emu.fp_gpp[sector / f_emu.part_size];
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sector = sector % f_emu.part_size;
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// Special handling for reads/writes which cross file-boundaries.
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if (__builtin_expect(sector + num_sectors > f_emu.part_size, 0))
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{
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unsigned int remaining = num_sectors;
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while (remaining > 0) {
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const unsigned int cur_sectors = MIN(remaining, f_emu.part_size - sector);
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if (f_lseek(fp, sector << 9) != FR_OK)
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return 0; // Out of bounds.
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if (is_write)
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{
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if (f_write_fast(fp, buf, cur_sectors << 9) != FR_OK)
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return 0;
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}
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else
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{
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if (f_read_fast(fp, buf, cur_sectors << 9) != FR_OK)
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return 0;
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}
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remaining -= cur_sectors;
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sector = 0;
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++fp;
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}
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return 1;
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}
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}
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else
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{
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