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Optimise block creation

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shermp
2018-12-23 16:55:43 +13:00
parent 4b57ebfe3e
commit fac6eb2b69
1 changed files with 11 additions and 1 deletions
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12
minivhd.c
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@@ -532,7 +532,17 @@ int vhd_write_sectors(VHDMeta *vhdm, FILE *f, int offset, int nr_sectors, void *
/* We need to create a data block if it does not yet exist. */
if (vhdm->sparse_bat_arr[curr_blk] == VHD_SPARSE_BLK)
{
vhd_create_blk(vhdm, f, curr_blk);
/* If the sector to write contains all zeros, hold off on block creation and therefore
writing to file for this sector. */
if (memcmp(buff_ptr, VHD_ZERO_SECTOR, VHD_SECTOR_SZ) == 0)
{
buff_ptr += VHD_SECTOR_SZ;
continue;
}
else
{
vhd_create_blk(vhdm, f, curr_blk);
}
}
if (curr_blk != prev_blk)
{