/// <summary>
/// Creates a Checksum from a hex string representation of bytes
/// </summary>
/// <param name="hashAlgorithmName">The name of the hash algorithm used to calculate the hash bytes.</param>
/// <param name="checksumString">Hex String representation of hash bytse. Example: "A0B1C2D3E4F5A6B7C8D9E0F1A2B3C4D5"</param>
/// <returns></returns>
public static Checksum FromString(MIHashAlgorithmName hashAlgorithmName, string checksumString)
{
if (checksumString == null)
{
throw new ArgumentNullException("checksumString");
}
Checksum checksum = new Checksum(hashAlgorithmName, StringToBytes(checksumString));
checksum._checksumString = checksumString;
return checksum;
}
/// <summary>
/// Get the checksums associated with this pending breakpoint in order to verify the source file
/// </summary>
/// <param name="hashAlgorithmId">The HashAlgorithmId to use to calculate checksums</param>
/// <param name="checksums">Enumerable of the checksums obtained from the UI</param>
/// <returns>
/// S_OK on Success, Error Codes on failure
/// </returns>
private int GetChecksum(HashAlgorithmId hashAlgorithmId, out IEnumerable<Checksum> checksums)
{
checksums = Enumerable.Empty<Checksum>();
IDebugBreakpointChecksumRequest2 checksumRequest = _pBPRequest as IDebugBreakpointChecksumRequest2;
if (checksumRequest == null)
{
return Constants.E_NOTIMPL;
}
int hr = Constants.S_OK;
int checksumEnabled;
hr = checksumRequest.IsChecksumEnabled(out checksumEnabled);
if (hr != Constants.S_OK || checksumEnabled == 0)
{
return Constants.E_NOTIMPL;
}
Guid guidAlgorithm = hashAlgorithmId.AD7GuidHashAlgorithm;
uint checksumSize = hashAlgorithmId.HashSize;
CHECKSUM_DATA[] checksumDataArr = new CHECKSUM_DATA[1];
hr = checksumRequest.GetChecksum(ref guidAlgorithm, checksumDataArr);
if (hr != Constants.S_OK)
{
return hr;
}
CHECKSUM_DATA checksumData = checksumDataArr[0];
Debug.Assert(checksumData.ByteCount % checksumSize == 0);
uint countChecksums = checksumData.ByteCount / checksumSize;
if (countChecksums == 0)
{
return Constants.S_OK;
}
byte[] allChecksumBytes = new byte[checksumData.ByteCount];
System.Runtime.InteropServices.Marshal.Copy(checksumData.pBytes, allChecksumBytes, 0, allChecksumBytes.Length);
System.Runtime.InteropServices.Marshal.FreeCoTaskMem(checksumData.pBytes);
Checksum[] checksumArray = new Checksum[countChecksums];
for (uint i = 0; i < countChecksums; i++)
{
checksumArray[i] = Checksum.FromBytes(hashAlgorithmId.MIHashAlgorithmName, allChecksumBytes.Skip((int)(i * checksumSize)).Take((int)checksumSize).ToArray());
}
checksums = checksumArray;
return Constants.S_OK;
}