Initial commit

Signed-off-by: Jose Bollo <jose.bollo@iot.bzh>

1 files changed, 111 insertions, 0 deletions

diff --git a/src/fbuf.h b/src/fbuf.h
new file mode 100644
index 0000000..3bbdbde
--- /dev/null
+++ b/src/fbuf.h
@@ -0,0 +1,111 @@
+#pragma once
+
+/**
+ * A fbuf records file data and access
+ */
+struct fbuf
+{
+        /** filename for messages */
+        const char *name;
+
+        /** in memory copy of the file */
+        void *buffer;
+
+        /** size saved to the file */
+        uint32_t saved;
+
+        /** size currently used */
+        uint32_t used;
+
+        /** size currently allocated */
+        uint32_t capacity;
+
+        /** size of the file */
+        uint32_t size;
+
+        /** opened file descriptor for the file */
+        int fd;
+};
+
+/** short type */
+typedef struct fbuf fbuf_t;
+
+
+/** open in 'fb' the file of 'name' */
+extern
+int
+fbuf_open(
+	fbuf_t	*fb,
+	const char *name
+);
+
+/** close the file 'fb' */
+extern
+void
+fbuf_close(
+	fbuf_t	*fb
+);
+
+/** write to file 'fb' at 'offset' the 'count' bytes pointed by 'buffer' */
+extern
+int
+fbuf_write(
+	fbuf_t	*fb,
+	const void *buffer,
+	uint32_t count,
+	uint32_t offset
+);
+
+/** write to file 'fb' the unsaved bytes and flush the content to the file */
+extern
+int
+fbuf_sync(
+	fbuf_t	*fb
+);
+
+/** allocate enough memory in 'fb' to store 'count' bytes */
+extern
+int
+fbuf_ensure_capacity(
+	fbuf_t	*fb,
+	uint32_t count
+);
+
+/** put at 'offset' in the memory of 'fb' the 'count' bytes pointed by 'buffer' */
+extern
+int
+fbuf_put(
+	fbuf_t	*fb,
+	const void *buffer,
+	uint32_t count,
+	uint32_t offset
+);
+
+/** append at end in the memory of 'fb' the 'count' bytes pointed by 'buffer' */
+extern
+int
+fbuf_append(
+	fbuf_t	*fb,
+	const void *buffer,
+	uint32_t count
+);
+
+/** check or make identification of file 'fb' by 'id' of 'len' */
+extern
+int
+fbuf_identify(
+	fbuf_t	*fb,
+	const char *id,
+	uint32_t idlen
+);
+
+/** check or make identification by 'uuid' of file 'fb' */
+extern
+int
+fbuf_open_identify(
+	fbuf_t	*fb,
+	const char *name,
+	const char *id,
+	uint32_t idlen
+);
+