增加写时复制的报文修改接口

- 该系列接口(prepend/append/adj/trim_cw)，当检测到报文被其他人引用时（引用计数大于1），对传入的报文缓冲区执行一次深拷贝，然后修改深拷贝以后的报文缓冲区。

1 files changed, 21 insertions, 8 deletions

diff --git a/include/external/marsio.h b/include/external/marsio.h
index 3b8aae1..8956db6 100644
--- a/include/external/marsio.h
+++ b/include/external/marsio.h
@@ -28,14 +28,14 @@ typedef enum
 
 typedef enum
 {
-    /* 发送后不释放数据包，由应用自行释放数据包 */
-    MARSIO_SEND_OPT_NO_FREE = 1 << 0,
-    /* 发送时计算发包哈希值，用于分流 */
-    MARSIO_SEND_OPT_REHASH = 1 << 1,
-    /* 快速报文路径 */
-    MARSIO_SEND_OPT_FAST = 1 << 2,
-    /* 报文追踪标记 */
-    MARSIO_SEND_OPT_TRACE = 1 << 3,
+	/* 发送后不释放数据包，由应用自行释放数据包 */
+	MARSIO_SEND_OPT_NO_FREE = 1 << 0,
+	/* 发送时计算发包哈希值，用于分流 */
+	MARSIO_SEND_OPT_REHASH = 1 << 1,
+	/* 快速报文路径 */
+	MARSIO_SEND_OPT_FAST = 1 << 2,
+	/* 报文追踪标记 */
+	MARSIO_SEND_OPT_TRACE = 1 << 3,
 	/* 控制报文标记 */
 	MARSIO_SEND_OPT_CTRL = 1 << 4
 
@@ -177,6 +177,19 @@ char *marsio_buff_adj(marsio_buff_t *m, uint16_t len);
 
 int marsio_buff_trim(marsio_buff_t *m, uint16_t len);
 
+/* 支持写时复制的报文修改裁剪函数 */
+marsio_buff_t * marsio_buff_prepend_cw(struct mr_instance * instance,
+	marsio_buff_t *m, uint16_t len, void ** ptr_out);
+
+marsio_buff_t * marsio_buff_append_cw(struct mr_instance * instance,
+	marsio_buff_t *m, uint16_t len, void ** ptr_out);
+
+marsio_buff_t * marsio_buff_adj_cw(struct mr_instance * instance,
+	marsio_buff_t *m, uint16_t len, void ** ptr_out);
+
+marsio_buff_t * marsio_buff_trim_cw(struct mr_instance * instance,
+	marsio_buff_t *m, uint16_t len, void ** ptr_out);
+
 uint16_t marsio_buff_headroom(const marsio_buff_t *m);
 
 uint16_t marsio_buff_tailroom(const marsio_buff_t *m);