byteq: Move from extras/ezio into lib and export some private functions.

The upcoming JSON-RPC library wants to use this library, and it needs some
functions that are currently declared static.

1 files changed, 52 insertions, 0 deletions

diff --git a/lib/byteq.h b/lib/byteq.h
new file mode 100644
index 000000000..84d8696fe
--- /dev/null
+++ b/lib/byteq.h
@@ -0,0 +1,52 @@
+/* Copyright (c) 2008, 2009 Nicira Networks, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BYTEQ_H
+#define BYTEQ_H 1
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+/* Maximum number of bytes in a byteq. */
+#define BYTEQ_SIZE 512
+
+/* General-purpose circular queue of bytes. */
+struct byteq {
+    uint8_t buffer[BYTEQ_SIZE]; /* Circular queue. */
+    unsigned int head;          /* Head of queue. */
+    unsigned int tail;          /* Chases the head. */
+};
+
+void byteq_init(struct byteq *);
+int byteq_used(const struct byteq *);
+int byteq_avail(const struct byteq *);
+bool byteq_is_empty(const struct byteq *);
+bool byteq_is_full(const struct byteq *);
+void byteq_put(struct byteq *, uint8_t c);
+void byteq_putn(struct byteq *, const void *, size_t n);
+void byteq_put_string(struct byteq *, const char *);
+uint8_t byteq_get(struct byteq *);
+int byteq_write(struct byteq *, int fd);
+int byteq_read(struct byteq *, int fd);
+
+uint8_t *byteq_head(struct byteq *);
+int byteq_headroom(const struct byteq *);
+void byteq_advance_head(struct byteq *, unsigned int n);
+int byteq_tailroom(const struct byteq *);
+const uint8_t *byteq_tail(const struct byteq *);
+void byteq_advance_tail(struct byteq *, unsigned int n);
+
+#endif /* byteq.h */