tor-android/external/badvpn_dns/flow/StreamRecvInterface.h

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2015-01-25 11:08:34 +00:00
/**
* @file StreamRecvInterface.h
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @section DESCRIPTION
*
* Interface allowing a stream receiver to receive stream data from a stream sender.
*
* Note that this interface behaves exactly the same and has the same code as
* {@link StreamPassInterface} if names and its external semantics are disregarded.
* If you modify this file, you should probably modify {@link StreamPassInterface}
* too.
*/
#ifndef BADVPN_FLOW_STREAMRECVINTERFACE_H
#define BADVPN_FLOW_STREAMRECVINTERFACE_H
#include <stdint.h>
#include <stddef.h>
#include <misc/debug.h>
#include <base/DebugObject.h>
#include <base/BPending.h>
#define SRI_STATE_NONE 1
#define SRI_STATE_OPERATION_PENDING 2
#define SRI_STATE_BUSY 3
#define SRI_STATE_DONE_PENDING 4
typedef void (*StreamRecvInterface_handler_recv) (void *user, uint8_t *data, int data_len);
typedef void (*StreamRecvInterface_handler_done) (void *user, int data_len);
typedef struct {
// provider data
StreamRecvInterface_handler_recv handler_operation;
void *user_provider;
// user data
StreamRecvInterface_handler_done handler_done;
void *user_user;
// operation job
BPending job_operation;
uint8_t *job_operation_data;
int job_operation_len;
// done job
BPending job_done;
int job_done_len;
// state
int state;
DebugObject d_obj;
} StreamRecvInterface;
static void StreamRecvInterface_Init (StreamRecvInterface *i, StreamRecvInterface_handler_recv handler_operation, void *user, BPendingGroup *pg);
static void StreamRecvInterface_Free (StreamRecvInterface *i);
static void StreamRecvInterface_Done (StreamRecvInterface *i, int data_len);
static void StreamRecvInterface_Receiver_Init (StreamRecvInterface *i, StreamRecvInterface_handler_done handler_done, void *user);
static void StreamRecvInterface_Receiver_Recv (StreamRecvInterface *i, uint8_t *data, int data_len);
void _StreamRecvInterface_job_operation (StreamRecvInterface *i);
void _StreamRecvInterface_job_done (StreamRecvInterface *i);
void StreamRecvInterface_Init (StreamRecvInterface *i, StreamRecvInterface_handler_recv handler_operation, void *user, BPendingGroup *pg)
{
// init arguments
i->handler_operation = handler_operation;
i->user_provider = user;
// set no user
i->handler_done = NULL;
// init jobs
BPending_Init(&i->job_operation, pg, (BPending_handler)_StreamRecvInterface_job_operation, i);
BPending_Init(&i->job_done, pg, (BPending_handler)_StreamRecvInterface_job_done, i);
// set state
i->state = SRI_STATE_NONE;
DebugObject_Init(&i->d_obj);
}
void StreamRecvInterface_Free (StreamRecvInterface *i)
{
DebugObject_Free(&i->d_obj);
// free jobs
BPending_Free(&i->job_done);
BPending_Free(&i->job_operation);
}
void StreamRecvInterface_Done (StreamRecvInterface *i, int data_len)
{
ASSERT(i->state == SRI_STATE_BUSY)
ASSERT(data_len > 0)
ASSERT(data_len <= i->job_operation_len)
DebugObject_Access(&i->d_obj);
// schedule done
i->job_done_len = data_len;
BPending_Set(&i->job_done);
// set state
i->state = SRI_STATE_DONE_PENDING;
}
void StreamRecvInterface_Receiver_Init (StreamRecvInterface *i, StreamRecvInterface_handler_done handler_done, void *user)
{
ASSERT(handler_done)
ASSERT(!i->handler_done)
DebugObject_Access(&i->d_obj);
i->handler_done = handler_done;
i->user_user = user;
}
void StreamRecvInterface_Receiver_Recv (StreamRecvInterface *i, uint8_t *data, int data_len)
{
ASSERT(data_len > 0)
ASSERT(data)
ASSERT(i->state == SRI_STATE_NONE)
ASSERT(i->handler_done)
DebugObject_Access(&i->d_obj);
// schedule operation
i->job_operation_data = data;
i->job_operation_len = data_len;
BPending_Set(&i->job_operation);
// set state
i->state = SRI_STATE_OPERATION_PENDING;
}
#endif