part3Data := dummyData[2*partSize:]

	// Calculate CRC32C checksum for each part using NewChecksumFromData
	checksumType := ChecksumCRC32C

	part1Checksum := NewChecksumFromData(checksumType, part1Data)
	part2Checksum := NewChecksumFromData(checksumType, part2Data)
	part3Checksum := NewChecksumFromData(checksumType, part3Data)

	// Combine the raw checksums (this is what happens in CompleteMultipartUpload)

type Checksum struct {
	Type      ChecksumType
	Encoded   string
	Raw       []byte
	WantParts int
}

// Is returns if c is all of t.
func (c ChecksumType) Is(t ChecksumType) bool {
	if t == ChecksumNone {
		return c == ChecksumNone
	}
	return c&t == t
}

// Base returns the base checksum (if any)
func (c ChecksumType) Base() ChecksumType {
	return c & baseTypeMask
}

			fi.Checksum = v
		}
		delete(opts.UserDefined, ReplicationSsecChecksumHeader)
	}

	if checksumType.IsSet() {
		checksumType |= hash.ChecksumMultipart | hash.ChecksumIncludesMultipart
		checksum.Type = checksumType
		if !checksumType.FullObjectRequested() {
			checksum = *hash.NewChecksumFromData(checksumType, checksumCombined)
		}
		fi.Checksum = checksum.AppendTo(nil, checksumCombined)

 * the License.
 */

package com.google.common.hash;

import static com.google.common.hash.Hashing.ChecksumType.ADLER_32;
import static com.google.common.hash.Hashing.ChecksumType.CRC_32;

import java.util.zip.Checksum;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Tests for ChecksumHashFunction.
 *

	Parts []PartInfo

	// Any metadata set during InitMultipartUpload, including encryption headers.
	UserDefined map[string]string

	// ChecksumAlgorithm if set
	ChecksumAlgorithm string

	// ChecksumType if set
	ChecksumType string
}

// Lookup - returns if uploadID is valid
func (lm ListMultipartsInfo) Lookup(uploadID string) bool {
	for _, upload := range lm.Uploads {
		if upload.UploadID == uploadID {

import com.google.errorprone.annotations.Immutable;

/**
 * Explicitly named subinterface of {@link Supplier} that can be marked {@literal @}{@link
 * Immutable}.
 */
// TODO(cpovirk): Should we just use ChecksumType directly instead of defining this type?
@Immutable

			if err != nil {
				err = msgp.WrapError(err, "ChecksumAlgorithm")
				return
			}
		case "ChecksumType":
			z.ChecksumType, bts, err = msgp.ReadStringBytes(bts)
			if err != nil {
				err = msgp.WrapError(err, "ChecksumType")
				return
			}
		default:
			bts, err = msgp.Skip(bts)
			if err != nil {
				err = msgp.WrapError(err)
				return
			}

	// needs to be computed and saved on the destination object, but the client
	// does not provide it. Not calculated if client-side contentHash is set.
	ServerSideChecksumType   ChecksumType
	ServerSideHasher         hash.Hash
	ServerSideChecksumResult *Checksum

	trailer http.Header

	sha256 hash.Hash
}

// Options are optional arguments to NewReaderWithOpts, Options

   * href="https://en.wikipedia.org/wiki/Hash_function">hash function</a>.
   *
   * @since 14.0
   */
  public static HashFunction adler32() {
    return ChecksumType.ADLER_32.hashFunction;
  }

  @Immutable
  enum ChecksumType implements ImmutableSupplier<Checksum> {
    CRC_32("Hashing.crc32()") {
      @Override
      public Checksum get() {
        return new CRC32();
      }
    },

			return checkPreconditionsPUT(ctx, w, r, oi, opts)
		}
	}

	checksumType := hash.NewChecksumHeader(r.Header)
	if checksumType.Is(hash.ChecksumInvalid) {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidChecksum), r.URL)
		return
	} else if checksumType.IsSet() && !checksumType.Is(hash.ChecksumTrailing) {
		opts.WantChecksum = &hash.Checksum{Type: checksumType}
	}

	if opts.WantChecksum != nil {