*/
  private static boolean validateSyntax(List<String> parts) {
    int lastIndex = parts.size() - 1;

    // Validate the last part specially, as it has different syntax rules.

    if (!validatePart(parts.get(lastIndex), true)) {
      return false;
    }

    for (int i = 0; i < lastIndex; i++) {
      String part = parts.get(i);
      if (!validatePart(part, false)) {
        return false;
      }
    }

        checkNotNull(appendable, "appendable");
        checkNotNull(parts, "parts");
        while (parts.hasNext()) {
          Object part = parts.next();
          if (part != null) {
            appendable.append(Joiner.this.toString(part));
            break;
          }
        }
        while (parts.hasNext()) {
          Object part = parts.next();

        "application/multipart; boundary=\"simple boundary\"".toMediaType(),
      )

    val parts = MultipartReader(responseBody)
    assertThat(parts.boundary).isEqualTo("simple boundary")

    val part = parts.nextPart()!!
    assertThat(part.body.readUtf8()).isEqualTo("abcd")

    assertThat(parts.nextPart()).isNull()
  }

  @Test fun `truncated multipart`() {
    val multipart =
      """

		b = b[length:]
		if !typ.Is(ChecksumIncludesMultipart) {
			continue
		}
		parts, n := binary.Uvarint(b)
		if n <= 0 {
			break
		}
		if len(res) == 0 {
			res = make([]map[string]string, parts)
		}
		b = b[n:]
		for part := 0; part < int(parts); part++ {
			if len(b) < length {
				break
			}
			// Read part checksum
			cs := base64.StdEncoding.EncodeToString(b[:length])
			b = b[length:]

        checkNotNull(appendable, "appendable");
        checkNotNull(parts, "parts");
        while (parts.hasNext()) {
          Object part = parts.next();
          if (part != null) {
            appendable.append(Joiner.this.toString(part));
            break;
          }
        }
        while (parts.hasNext()) {
          Object part = parts.next();

		return 0, o.Size, 0, 0, 0, nil
	}

	// Assemble slice of (decrypted) part sizes in `sizes`
	var sizes []int64
	var decObjSize int64 // decrypted total object size
	if o.isMultipart() {
		sizes = make([]int64, len(o.Parts))
		for i, part := range o.Parts {
			var partSize uint64
			partSize, err = sio.DecryptedSize(uint64(part.Size))
			if err != nil {
				err = errObjectTampered
				return
			}

		}
	}

	// Only parts with higher part numbers will be listed.
	parts := fi.Parts
	result.Parts = make([]PartInfo, 0, len(parts))
	for _, part := range parts {
		result.Parts = append(result.Parts, PartInfo{
			PartNumber:     part.Number,
			ETag:           part.ETag,
			LastModified:   part.ModTime,
			ActualSize:     part.ActualSize,
			Size:           part.Size,

          parts += part
        }

      /** Assemble the specified parts into a request body. */
      fun build(): MultipartBody {
        check(parts.isNotEmpty()) { "Multipart body must have at least one part." }
        return MultipartBody(boundary, type, parts.toImmutableList())
      }
    }

  companion object {
    /**
     * The "mixed" subtype of "multipart" is intended for use when the body parts are independent

		Checksums:  checksums,
	}

	// Update part info if it already exists.
	for i, part := range fi.Parts {
		if partNumber == part.Number {
			fi.Parts[i] = partInfo
			return
		}
	}

	// Proceed to include new part info.
	fi.Parts = append(fi.Parts, partInfo)

	// Parts in FileInfo should be in sorted order by part number.

                    classParts = parts.subList(lastPackagePartIndexExclusive, parts.size),
                    callable = null,
                )
            )

            if (lastPackagePartIndexExclusive <= parts.size - 1) {
                yield(
                    FqNameInterpretation.create(