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Simplify format sectors

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This commit is contained in:
shermp
2018-12-23 15:13:26 +13:00
parent 809d7412a6
commit f5bf27ca0f
1 changed files with 12 additions and 22 deletions
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34
minivhd.c
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@@ -565,34 +565,24 @@ int vhd_format_sectors(VHDMeta *vhdm, FILE *f, int offset, int nr_sectors)
if (vhdm->type == VHD_DYNAMIC)
{
int start_blk = offset / vhdm->sparse_spb;
int end_blk = (offset + (transfer_sectors - 1)) / vhdm->sparse_spb;
int sbsz = vhdm->sparse_sb_sz / VHD_SECTOR_SZ;
/* Most common case. No need to access multiple data blocks. */
if (start_blk == end_blk)
int prev_blk, curr_blk;
prev_blk = -1;
uint32_t s, ls, sib;
ls = offset + (transfer_sectors - 1);
for (s = offset; s <= ls; s++)
{
uint32_t sib = offset % vhdm->sparse_spb;
if (vhdm->sparse_bat_arr[start_blk] != VHD_SPARSE_BLK)
curr_blk = s / vhdm->sparse_spb;
if (vhdm->sparse_bat_arr[curr_blk] != VHD_SPARSE_BLK)
{
uint32_t file_sect_offs = vhdm->sparse_bat_arr[start_blk] + sbsz + sib;
fseeko64(f, (uint64_t)file_sect_offs * VHD_SECTOR_SZ, SEEK_SET);
fwrite(zero_buffer, transfer_sectors * VHD_SECTOR_SZ, 1, f);
}
}
else
{
uint32_t s, ls;
ls = offset + (transfer_sectors - 1);
for (s = offset; s <= ls; s++)
{
int blk = s / vhdm->sparse_spb;
uint32_t sib = s % vhdm->sparse_spb;
if (vhdm->sparse_bat_arr[blk] != VHD_SPARSE_BLK)
if (curr_blk != prev_blk)
{
uint32_t file_sect_offs = vhdm->sparse_bat_arr[blk] + sbsz + sib;
sib = s % vhdm->sparse_spb;
uint32_t file_sect_offs = vhdm->sparse_bat_arr[curr_blk] + sbsz + sib;
fseeko64(f, (uint64_t)file_sect_offs * VHD_SECTOR_SZ, SEEK_SET);
fwrite(zero_buffer, VHD_SECTOR_SZ, 1, f);
prev_blk = curr_blk;
}
fwrite(zero_buffer, VHD_SECTOR_SZ, 1, f);
}
}
}