kopia lustrzana https://github.com/cyoung/stratux
64 wiersze
2.3 KiB
C
64 wiersze
2.3 KiB
C
//
|
|
// Copyright 2015, Oliver Jowett <oliver@mutability.co.uk>
|
|
//
|
|
|
|
// This file is free software: you may copy, redistribute and/or modify it
|
|
// under the terms of the GNU General Public License as published by the
|
|
// Free Software Foundation, either version 2 of the License, or (at your
|
|
// option) any later version.
|
|
//
|
|
// This file is distributed in the hope that it will be useful, but
|
|
// WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
// General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
#ifndef DUMP978_READER_H
|
|
#define DUMP978_READER_H
|
|
|
|
#include <stdint.h>
|
|
|
|
struct dump978_reader;
|
|
|
|
typedef enum { UAT_UPLINK, UAT_DOWNLINK } frame_type_t;
|
|
|
|
// Function pointer type for a handler called by dump978_read_frames().
|
|
// It is called with arguments:
|
|
// t: frame type (UAT_UPLINK or UAT_DOWNLINK)
|
|
// f: pointer to frame data buffer
|
|
// l: length of frame data
|
|
// d: value of handler_data passed to dump978_read_frames
|
|
// The frame data buffer is a shared buffer owned by the caller
|
|
// and may be reused after return; if the handler needs to
|
|
// preserve the data after returning, it should take a copy.
|
|
typedef void (*frame_handler_t)(frame_type_t t,uint8_t *f,int l,void *d);
|
|
|
|
// Allocate a new reader that reads from file descriptor 'fd'.
|
|
// If 'nonblock' is nonzero, the FD will be made nonblocking.
|
|
// Returns the reader, or NULL on error with errno set.
|
|
struct dump978_reader *dump978_reader_new(int fd, int nonblock);
|
|
|
|
// Free a reader previously created by dump978_reader_new.
|
|
// Does not close the underlying file descriptor.
|
|
void dump978_reader_free(struct dump978_reader *reader);
|
|
|
|
// Read frames from the given reader.
|
|
// Pass complete frames to 'handler', passing 'handler_data'
|
|
// as the 4th argument.
|
|
//
|
|
// Returns a positive number of frames read on success.
|
|
// Returns 0 on EOF
|
|
// Returns <0 on error with errno set.
|
|
// If the underlying FD is nonblocking and no frames are
|
|
// available, returns <0 with errno = EAGAIN/EINTR/EWOULDBLOCK.
|
|
int dump978_read_frames(struct dump978_reader *reader,
|
|
frame_handler_t handler,
|
|
void *handler_data);
|
|
|
|
#endif
|
|
|
|
|
|
|