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Add seek()

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Dehyphenate "data-transfer".
This commit is contained in:
Michael Brown
2007-04-29 02:03:58 +00:00
parent ff1222a8d3
commit 280160139d
4 changed files with 137 additions and 38 deletions
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70
src/include/gpxe/xfer.h
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@@ -32,22 +32,29 @@ struct xfer_interface_operations {
/** Close interface
*
* @v xfer Data-transfer interface
* @v xfer Data transfer interface
* @v rc Reason for close
*/
void ( * close ) ( struct xfer_interface *xfer, int rc );
/** Redirect to new location
*
* @v xfer Data-transfer interface
* @v xfer Data transfer interface
* @v type New location type
* @v args Remaining arguments depend upon location type
* @ret rc Return status code
*/
int ( * vredirect ) ( struct xfer_interface *xfer, int type,
va_list args );
/** Seek to position
*
* @v xfer Data transfer interface
* @v pos New position
* @ret rc Return status code
*/
int ( * seek ) ( struct xfer_interface *xfer, size_t pos );
/** Deliver datagram
*
* @v xfer Data-transfer interface
* @v xfer Data transfer interface
* @v iobuf Datagram I/O buffer
* @ret rc Return status code
*
@@ -59,7 +66,7 @@ struct xfer_interface_operations {
struct io_buffer *iobuf );
/** Deliver datagram as raw data
*
* @v xfer Data-transfer interface
* @v xfer Data transfer interface
* @v data Data buffer
* @v len Length of data buffer
* @ret rc Return status code
@@ -83,32 +90,67 @@ struct xfer_interface {
extern struct xfer_interface null_xfer;
extern struct xfer_interface_operations null_xfer_ops;
extern void close ( struct xfer_interface *xfer, int rc );
extern int seek ( struct xfer_interface *xfer, size_t pos );
extern int vredirect ( struct xfer_interface *xfer, int type, va_list args );
extern int redirect ( struct xfer_interface *xfer, int type, ... );
extern int deliver ( struct xfer_interface *xfer, struct io_buffer *iobuf );
extern int deliver_raw ( struct xfer_interface *xfer,
const void *data, size_t len );
extern void ignore_close ( struct xfer_interface *xfer, int rc );
extern int ignore_vredirect ( struct xfer_interface *xfer,
int type, va_list args );
extern int ignore_seek ( struct xfer_interface *xfer, size_t pos );
extern int deliver_as_raw ( struct xfer_interface *xfer,
struct io_buffer *iobuf );
extern int deliver_as_iobuf ( struct xfer_interface *xfer,
const void *data, size_t len );
extern int ignore_deliver_raw ( struct xfer_interface *xfer,
const void *data __unused, size_t len );
/**
* Get destination data-transfer interface
* Initialise a data transfer interface
*
* @v xfer Data-transfer interface
* @v xfer Data transfer interface
* @v op Data transfer interface operations
* @v refcnt Data transfer interface reference counting method
*/
static inline void xfer_init ( struct xfer_interface *xfer,
struct xfer_interface_operations *op,
void ( * refcnt ) ( struct interface *intf,
int delta ) ) {
xfer->intf.dest = &null_xfer.intf;
xfer->intf.refcnt = refcnt;
xfer->op = op;
}
/**
* Get data transfer interface from generic object communication interface
*
* @v intf Generic object communication interface
* @ret xfer Data transfer interface
*/
static inline struct xfer_interface *
intf_to_xfer ( struct interface *intf ) {
return container_of ( intf, struct xfer_interface, intf );
}
/**
* Get destination data transfer interface
*
* @v xfer Data transfer interface
* @ret dest Destination interface
*/
static inline struct xfer_interface *
xfer_dest ( struct xfer_interface *xfer ) {
return container_of ( xfer->intf.dest, struct xfer_interface, intf );
return intf_to_xfer ( xfer->intf.dest );
}
/**
* Plug a data-transfer interface into a new destination interface
* Plug a data transfer interface into a new destination interface
*
* @v xfer Data-transfer interface
* @v xfer Data transfer interface
* @v dest New destination interface
*/
static inline void xfer_plug ( struct xfer_interface *xfer,
@@ -117,23 +159,23 @@ static inline void xfer_plug ( struct xfer_interface *xfer,
}
/**
* Unplug a data-transfer interface
* Unplug a data transfer interface
*
* @v xfer Data-transfer interface
* @v xfer Data transfer interface
*/
static inline void xfer_unplug ( struct xfer_interface *xfer ) {
plug ( &xfer->intf, &null_xfer.intf );
}
/**
* Terminate a data-transfer interface
* Stop using a data transfer interface
*
* @v xfer Data-transfer interface
* @v xfer Data transfer interface
*
* After calling this method, no further messages will be received via
* the interface.
*/
static inline void xfer_terminate ( struct xfer_interface *xfer ) {
static inline void xfer_nullify ( struct xfer_interface *xfer ) {
xfer->op = &null_xfer_ops;
};