tx_deflate.c File Reference

---

Detailed Description

Network driver -- compressing level.

This driver compresses its data stream before sending it to the link layer.

Author:

Raphael Manfredi

Date:

2002-2003

#include "common.h"
#include "sockets.h"
#include "hosts.h"
#include "tx.h"
#include "tx_deflate.h"
#include "if/gnet_property_priv.h"
#include "lib/endian.h"
#include "lib/walloc.h"
#include "lib/zlib_util.h"
#include "lib/override.h"

Data Structures
struct	buffer
struct	attr
	Private attributes for the decompressing layer. More...
Defines
#define	BUFFER_COUNT   2
#define	BUFFER_NAGLE   200 /**< 200 ms */
	200 ms
#define	DF_FLOWC   0x00000001 /**< We flow-controlled the upper layer */
	We flow-controlled the upper layer.
#define	DF_NAGLE   0x00000002 /**< Nagle timer started */
	Nagle timer started.
#define	DF_FLUSH   0x00000004 /**< Flushing started */
	Flushing started.
#define	DF_SHUTDOWN   0x00000008 /**< Stack has shut down */
	Stack has shut down.
Functions
	RCSID ("$Id:tx_deflate.c, v 1.31 2005/11/15 21:30:07 rmanfredi Exp $")
void	deflate_nagle_timeout (cqueue_t *cq, gpointer arg)
	Called from the callout queue when the Nagle timer expires.
size_t	tx_deflate_pending (txdrv_t *tx)
void	deflate_send (txdrv_t *tx)
	Write ready-to-be-sent buffer to the lower layer.
void	deflate_nagle_start (txdrv_t *tx)
	Start the nagle timer.
void	deflate_nagle_stop (txdrv_t *tx)
	Stop the nagle timer.
void	deflate_rotate_and_send (txdrv_t *tx)
	Make the "filling buffer" the buffer to send, and rotate filling buffers.
gboolean	deflate_flush (txdrv_t *tx)
	Flush compression within filling buffer.
void	deflate_flush_send (txdrv_t *tx)
	Flush compression and send whatever we got so far.
gint	deflate_add (txdrv_t *tx, gconstpointer data, gint len)
	Compress as much data as possible to the output buffer, sending data as we go along.
void	deflate_service (gpointer data)
	Service routine for the compressing stage.
gpointer	tx_deflate_init (txdrv_t *tx, gpointer args)
	Initialize the driver.
void	tx_deflate_destroy (txdrv_t *tx)
	Get rid of the driver's private data.
ssize_t	tx_deflate_write (txdrv_t *tx, gpointer data, size_t len)
	Write data buffer.
ssize_t	tx_deflate_writev (txdrv_t *tx, struct iovec *iov, gint iovcnt)
	Write I/O vector.
void	tx_deflate_enable (txdrv_t *unused_tx)
	Allow servicing of upper TX queue.
void	tx_deflate_disable (txdrv_t *unused_tx)
	Disable servicing of upper TX queue.
void	tx_deflate_flush (txdrv_t *tx)
	Trigger the Nagle timeout immediately, if registered.
void	tx_deflate_shutdown (txdrv_t *tx)
	Disable all transmission.
void	tx_deflate_close (txdrv_t *tx, tx_closed_t cb, gpointer arg)
	Close the layer, flushing all the data there is.
const struct txdrv_ops *	tx_deflate_get_ops (void)
Variables
const struct txdrv_ops	tx_deflate_ops

---

Define Documentation

#define BUFFER_COUNT   2

#define BUFFER_NAGLE   200 /**< 200 ms */

200 ms

#define DF_FLOWC   0x00000001 /**< We flow-controlled the upper layer */

We flow-controlled the upper layer.

#define DF_FLUSH   0x00000004 /**< Flushing started */

Flushing started.

#define DF_NAGLE   0x00000002 /**< Nagle timer started */

Nagle timer started.

#define DF_SHUTDOWN   0x00000008 /**< Stack has shut down */

Stack has shut down.

---

Function Documentation

gint deflate_add (  txdrv_t *  tx, gconstpointer  data, gint  len )  [static]

Compress as much data as possible to the output buffer, sending data as we go along. Returns: the amount of input bytes that were consumed ("added"), -1 on error.

gboolean deflate_flush (  txdrv_t *  tx  )  [static]

Flush compression within filling buffer. Returns: success status, failure meaning we shutdown.

void deflate_flush_send (  txdrv_t *  tx  )  [static]

Flush compression and send whatever we got so far.

void deflate_nagle_start (  txdrv_t *  tx  )  [static]

Start the nagle timer.

void deflate_nagle_stop (  txdrv_t *  tx  )  [static]

Stop the nagle timer.

void deflate_nagle_timeout (  cqueue_t *  unused_cq, gpointer  arg )  [static]

Called from the callout queue when the Nagle timer expires. If we can send the buffer, flush it and send it. Otherwise, reschedule.

void deflate_rotate_and_send (  txdrv_t *  tx  )  [static]

Make the "filling buffer" the buffer to send, and rotate filling buffers. Attempt to write the new send buffer immediately.

void deflate_send (  txdrv_t *  tx  )  [static]

Write ready-to-be-sent buffer to the lower layer. < Amount of bytes to send

void deflate_service (  gpointer  data  )  [static]

Service routine for the compressing stage. Called by lower layer when it is ready to process more data.

RCSID (  "$Id:tx_deflate.  c, v 1.31 2005/11/15 21:30:07 rmanfredi Exp $"  )

void tx_deflate_close (  txdrv_t *  tx, tx_closed_t  cb, gpointer  arg )  [static]

Close the layer, flushing all the data there is. Once this is done, invoke the supplied callback.

void tx_deflate_destroy (  txdrv_t *  tx  )  [static]

Get rid of the driver's private data.

void tx_deflate_disable (  txdrv_t *  unused_tx  )  [static]

Disable servicing of upper TX queue.

void tx_deflate_enable (  txdrv_t *  unused_tx  )  [static]

Allow servicing of upper TX queue.

void tx_deflate_flush (  txdrv_t *  tx  )  [static]

Trigger the Nagle timeout immediately, if registered.

const struct txdrv_ops* tx_deflate_get_ops (  void   )

gpointer tx_deflate_init (  txdrv_t *  tx, gpointer  args )  [static]

Initialize the driver. Returns: NULL if there is an initialization problem.

size_t tx_deflate_pending (  txdrv_t *  tx  )  [static]

Returns: the amount of data buffered locally.

void tx_deflate_shutdown (  txdrv_t *  tx  )  [static]

Disable all transmission.

ssize_t tx_deflate_write (  txdrv_t *  tx, gpointer  data, size_t  len )  [static]

Write data buffer. Returns: amount of bytes written, or -1 on error.

ssize_t tx_deflate_writev (  txdrv_t *  tx, struct iovec *  iov, gint  iovcnt )  [static]

Write I/O vector. Returns: amount of bytes written, or -1 on error.

---

Variable Documentation

const struct txdrv_ops tx_deflate_ops [static]

Initial value: { tx_deflate_init, tx_deflate_destroy, tx_deflate_write, tx_deflate_writev, tx_no_sendto, tx_deflate_enable, tx_deflate_disable, tx_deflate_pending, tx_deflate_flush, tx_deflate_shutdown, tx_deflate_close, tx_no_source, }

---