add isc_buffer_{get,put}uint8

lib/isc/buffer.c

@@ -277,6 +277,40 @@ isc_buffer_compact(isc_buffer_t *b) {
 	b->used = length;
 }
 
+isc_uint8_t
+isc_buffer_getuint8(isc_buffer_t *b) {
+	unsigned char *cp;
+	isc_uint8_t result;
+
+	/*
+	 * Read an unsigned 8-bit integer from 'b' and return it.
+	 */
+
+	REQUIRE(VALID_BUFFER(b));
+	REQUIRE(b->used - b->current >= 1);
+
+	cp = b->base;
+	cp += b->current;
+	b->current += 1;
+	result = ((unsigned int)(cp[0]));
+
+	return (result);
+}
+
+void
+isc_buffer_putuint8(isc_buffer_t *b, isc_uint8_t val)
+{
+	unsigned char *cp;
+
+	REQUIRE(VALID_BUFFER(b));
+	REQUIRE(b->used + 1 <= b->length);
+
+	cp = b->base;
+	cp += b->used;
+	b->used += 1;
+	cp[0] = (val & 0x00ff);
+}
+
 isc_uint16_t
 isc_buffer_getuint16(isc_buffer_t *b) {
 	unsigned char *cp;

lib/isc/include/isc/buffer.h

@@ -422,6 +422,40 @@ isc_buffer_compact(isc_buffer_t *b);
  *	are those of the remaining region (as it was before the call).
  */
 
+isc_uint8_t
+isc_buffer_getuint8(isc_buffer_t *b);
+/*
+ * Read an unsigned 8-bit integer from 'b' and return it.
+ *
+ * Requires:
+ *
+ *	'b' is a valid buffer.
+ *
+ *	The length of the available region of 'b' is at least 1.
+ *
+ * Ensures:
+ *
+ *	The current pointer in 'b' is advanced by 1.
+ *
+ * Returns:
+ *
+ *	A 8-bit unsigned integer.
+ */
+
+void
+isc_buffer_putuint8(isc_buffer_t *b, isc_uint8_t val);
+/*
+ * Store an unsigned 8-bit integer from 'val' into 'b'.
+ *
+ * Requires:
+ *	'b' is a valid buffer.
+ *
+ *	The length of the unused region of 'b' is at least 1.
+ *
+ * Ensures:
+ *	The used pointer in 'b' is advanced by 1.
+ */
+
 isc_uint16_t
 isc_buffer_getuint16(isc_buffer_t *b);
 /*