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VHD: fix bug in multi-sector writes

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This commit is contained in:
sards3
2020-11-21 03:48:40 -06:00
committed by GitHub
parent c845d281fc
commit 68000092e2
1 changed files with 6 additions and 6 deletions
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12
src/disk/minivhd/minivhd_io.c
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@@ -245,6 +245,10 @@ int mvhd_sparse_diff_write(MVHDMeta* vhdm, uint32_t offset, int num_sectors, voi
for (s = offset; s < ls; s++) {
blk = s / vhdm->sect_per_block;
sib = s % vhdm->sect_per_block;
if (vhdm->bitmap.curr_block != blk && prev_blk >= 0) {
/* Write the sector bitmap for the previous block, before we replace it. */
mvhd_write_curr_sect_bitmap(vhdm);
}
if (vhdm->block_offset[blk] == MVHD_SPARSE_BLK) {
/* "read" the sector bitmap first, before creating a new block, as the bitmap will be
zero either way */
@@ -252,11 +256,7 @@ int mvhd_sparse_diff_write(MVHDMeta* vhdm, uint32_t offset, int num_sectors, voi
mvhd_create_block(vhdm, blk);
}
if (blk != prev_blk) {
if (vhdm->bitmap.curr_block != blk) {
if (prev_blk >= 0) {
/* Write the sector bitmap for the previous block, before we replace it. */
mvhd_write_curr_sect_bitmap(vhdm);
}
if (vhdm->bitmap.curr_block != blk) {
mvhd_read_sect_bitmap(vhdm, blk);
mvhd_fseeko64(vhdm->f, (uint64_t)sib * MVHD_SECTOR_SIZE, SEEK_CUR);
} else {
@@ -276,4 +276,4 @@ int mvhd_sparse_diff_write(MVHDMeta* vhdm, uint32_t offset, int num_sectors, voi
int mvhd_noop_write(MVHDMeta* vhdm, uint32_t offset, int num_sectors, void* in_buff) {
return 0;
}
}