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Fix VHD reading errors

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This commit is contained in:
shermp
2019-06-09 15:02:31 +12:00
parent e5be9944ed
commit 51f155d73e
1 changed files with 2 additions and 2 deletions
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4
src/minivhd_manage.c
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@@ -35,7 +35,7 @@ static void mvhd_read_footer(MVHDMeta* vhdm) {
static void mvhd_read_sparse_header(MVHDMeta* vhdm) {
uint8_t buffer[MVHD_SPARSE_SIZE];
fseeko64(vhdm->f, -MVHD_SPARSE_SIZE, SEEK_END);
fseeko64(vhdm->f, vhdm->footer.data_offset, SEEK_SET);
fread(buffer, sizeof buffer, 1, vhdm->f);
mvhd_buffer_to_header(&vhdm->sparse, buffer);
}
@@ -57,7 +57,7 @@ static uint32_t mvhd_gen_sparse_checksum(MVHDMeta* vhdm) {
vhdm->sparse.checksum = 0;
uint8_t* sparse_bytes = (uint8_t*)&vhdm->sparse;
for (size_t i = 0; i < sizeof vhdm->sparse; i++) {
new_chk = sparse_bytes[i];
new_chk += sparse_bytes[i];
}
vhdm->sparse.checksum = orig_chk;
return ~new_chk;