-/* Bits for csp->content_type */
-#define CT_TEXT 1U /**< csp->content_type bitmask:
- Suitable for pcrs filtering. */
-#define CT_GIF 2U /**< csp->content_type bitmask:
- Suitable for GIF filtering. */
-#define CT_TABOO 4U /**< csp->content_type bitmask:
- DO NOT filter, irrespective of other flags. */
-#define CT_JPEG 8U /**< csp->content_type bitmask:
- Suitable for JPEG filtering. */
+/* Bits for csp->content_type bitmask: */
+#define CT_TEXT 0x0001U /**< Suitable for pcrs filtering. */
+#define CT_GIF 0x0002U /**< Suitable for GIF filtering. */
+#define CT_TABOO 0x0004U /**< DO NOT filter, irrespective of other flags. */
+#define CT_JPEG 0x0008U /**< Suitable for JPEG filtering. */
+
+/* Although these are not, strictly speaking, content types
+ * (they are content encodings), it is simple to handle them
+ * as such.
+ */
+#define CT_GZIP 0x0010U /**< gzip-compressed data. */
+#define CT_DEFLATE 0x0020U /**< zlib-compressed data. */