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block: vhdx: adjust calculate_checksum

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It doesn't need to be public. None of its code path returns an error.

Signed-off-by: Wei Liu <liuwe@microsoft.com>
This commit is contained in:
Wei Liu 2024-12-24 20:20:33 +00:00 committed by Rob Bradford
parent 8f8d3c0139
commit 4ea4391f45
1 changed files with 4 additions and 4 deletions
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8
block/src/vhdx/vhdx_header.rs
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@ -142,7 +142,7 @@ impl Header {
return Err(VhdxHeaderError::InvalidHeaderSign);
}
let new_checksum = calculate_checksum(&mut buffer, size_of::<u32>())?;
let new_checksum = calculate_checksum(&mut buffer, size_of::<u32>());
if header.checksum != new_checksum {
return Err(VhdxHeaderError::InvalidChecksum(String::from("Header")));
}
@ -231,7 +231,7 @@ impl RegionTableHeader {
return Err(VhdxHeaderError::InvalidRegionSign);
}
let new_checksum = calculate_checksum(&mut buffer, size_of::<u32>())?;
let new_checksum = calculate_checksum(&mut buffer, size_of::<u32>());
if region_table_header.checksum != new_checksum {
return Err(VhdxHeaderError::InvalidChecksum(String::from("Region")));
}
@ -456,7 +456,7 @@ impl VhdxHeader {
/// Therefore, before calculating, the existing checksum is retrieved and the
/// corresponding field is made zero. After the calculation, the existing checksum
/// is put back to the buffer.
pub fn calculate_checksum(buffer: &mut [u8], csum_offset: usize) -> Result<u32> {
fn calculate_checksum(buffer: &mut [u8], csum_offset: usize) -> u32 {
// Read the original checksum from the buffer
let orig_csum = LittleEndian::read_u32(&buffer[csum_offset..csum_offset + 4]);
// Zero the checksum in the buffer
@ -469,5 +469,5 @@ pub fn calculate_checksum(buffer: &mut [u8], csum_offset: usize) -> Result<u32>
// Put back the original checksum in the buffer
LittleEndian::write_u32(&mut buffer[csum_offset..csum_offset + 4], orig_csum);
Ok(new_csum)
new_csum
}