for j, actualMetaData := range actualResult.Parts {
					//  Asserting the PartNumber in the PartInfo.
					if actualMetaData.PartNumber != expectedResult.Parts[j].PartNumber {
						t.Errorf("Test %d: %s: Part %d: Expected PartNumber to be \"%d\", but instead found \"%d\"", i+1, instanceType, j+1, expectedResult.Parts[j].PartNumber, actualMetaData.PartNumber)
					}
					//  Asserting the Size in the PartInfo.

	r.IfNoneMatch = canonicalizeETag(header.Get(xhttp.IfNoneMatch))
	r.IfRange = header.Get(xhttp.Range)
	ifPartNumberHeader := header.Get(xhttp.PartNumber)
	if ifPartNumberHeader != "" {
		if partNumber, err := strconv.Atoi(ifPartNumberHeader); err == nil {
			r.IfPartNumber = partNumber
		}
	}

			}
		case "Range":
			z.Range, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "Range")
				return
			}
		case "PartNumber":
			z.PartNumber, err = dc.ReadInt()
			if err != nil {
				err = msgp.WrapError(err, "PartNumber")
				return
			}
		case "Size":
			z.Size, err = dc.ReadInt64()
			if err != nil {
				err = msgp.WrapError(err, "Size")
				return
			}

	} else {
		for i := 0; i < len(unMarshalXLMeta.Erasure.Checksums); i++ {
			if unMarshalXLMeta.Erasure.Checksums[i].PartNumber != jsoniterXLMeta.Erasure.Checksums[i].PartNumber {
				t.Errorf("Expected the Erasure Checksum PartNumber to be \"%d\", got \"%d\".", unMarshalXLMeta.Erasure.Checksums[i].PartNumber, jsoniterXLMeta.Erasure.Checksums[i].PartNumber)
			}
			if unMarshalXLMeta.Erasure.Checksums[i].Algorithm != jsoniterXLMeta.Erasure.Checksums[i].Algorithm {

		if expETag != part.ETag {
			invp := InvalidPart{
				PartNumber: part.PartNumber,
				ExpETag:    expETag,
				GotETag:    part.ETag,
			}
			return oi, invp
		}

		if checksumType.IsSet() {
			crc := expPart.Checksums[checksumType.String()]
			if crc == "" {
				return oi, InvalidPart{
					PartNumber: part.PartNumber,
				}
			}
			wantCS := map[string]string{

const erasureAlgorithm = "rs-vandermonde"

// GetChecksumInfo - get checksum of a part.
func (e ErasureInfo) GetChecksumInfo(partNumber int) (ckSum ChecksumInfo) {
	for _, sum := range e.Checksums {
		if sum.PartNumber == partNumber {
			// Return the checksum
			return sum
		}
	}
	return ChecksumInfo{Algorithm: DefaultBitrotAlgorithm}
}

package cmd

import (
	"net/http"
	"testing"
)

func BenchmarkURLQueryForm(b *testing.B) {
	req, err := http.NewRequest(http.MethodGet, "http://localhost:9000/bucket/name?uploadId=upload&partNumber=1", http.NoBody)
	if err != nil {
		b.Fatal(err)
	}

	// benchmark utility which helps obtain number of allocations and bytes allocated per ops.
	b.ReportAllocs()

	var opts ObjectOptions

	var partNumber int
	var err error
	if pn := r.Form.Get(xhttp.PartNumber); pn != "" {
		partNumber, err = strconv.Atoi(pn)
		if err != nil {
			return opts, err
		}
		if isMaxPartID(partNumber) {
			return opts, errInvalidMaxParts
		}
		if partNumber <= 0 {
			return opts, errInvalidArgument
		}
	}

}

// Returns the part file name which matches the partNumber and etag.
func getPartFile(entriesTrie *trie.Trie, partNumber int, etag string) (partFile string) {
	for _, match := range entriesTrie.PrefixMatch(fmt.Sprintf("%.5d.%s.", partNumber, etag)) {
		partFile = match
		break
	}
	return partFile
}

func partNumberToRangeSpec(oi ObjectInfo, partNumber int) *HTTPRangeSpec {
	if oi.Size == 0 || len(oi.Parts) == 0 {

	a := 0
	b := globalMinPartSize
	var parts []CompletePart
	for partNumber := 1; partNumber <= 2; partNumber++ {
		// initialize HTTP NewRecorder, this records any mutations to response writer inside the handler.
		rec := httptest.NewRecorder()
		cpPartURL := getCopyObjectPartURL("", bucketName, testObject, uploadID, fmt.Sprintf("%d", partNumber))

		// construct HTTP request for copy object.
		var req *http.Request