Release version 0.0.1v0.0.1

- Initial revision.

1 files changed, 200 insertions, 0 deletions

diff --git a/libdvbmpeg/ringbuffy.c b/libdvbmpeg/ringbuffy.c
new file mode 100644
index 0000000..8451009
--- /dev/null
+++ b/libdvbmpeg/ringbuffy.c
@@ -0,0 +1,200 @@
+/* 
+    Ringbuffer Implementation for gtvscreen
+
+    Copyright (C) 2000 Marcus Metzler (mocm@metzlerbros.de)
+
+    This program is free software; you can redistribute it 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 program 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, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "ringbuffy.h"
+
+int ring_init (ringbuffy *rbuf, int size)
+{
+	if (size > 0){
+		rbuf->size = size;
+		if( !(rbuf->buffy = (char *) malloc(sizeof(char)*size)) ){
+			fprintf(stderr,"Not enough memory for ringbuffy\n");
+			return -1;
+		}
+	} else {
+		fprintf(stderr,"Wrong size for ringbuffy\n");
+		return -1;
+	}
+	rbuf->read_pos = 0;	
+	rbuf->write_pos = 0;
+	return 0;
+}
+
+
+void ring_destroy(ringbuffy *rbuf)
+{
+	free(rbuf->buffy);
+}
+
+
+int ring_write(ringbuffy *rbuf, char *data, int count)
+{
+
+	int diff, free, pos, rest;
+
+	if (count <=0 ) return 0;
+       	pos  = rbuf->write_pos;
+	rest = rbuf->size - pos;
+	diff = rbuf->read_pos - pos;
+	free = (diff > 0) ? diff-1 : rbuf->size+diff-1;
+
+	if ( free <= 0 ) return FULL_BUFFER;
+	if ( free < count ) count = free;
+	
+	if (count >= rest){
+		memcpy (rbuf->buffy+pos, data, rest);
+		if (count - rest)
+			memcpy (rbuf->buffy, data+rest, count - rest);
+		rbuf->write_pos = count - rest;
+	} else {
+		memcpy (rbuf->buffy+pos, data, count);
+		rbuf->write_pos += count;
+	}
+
+	return count;
+}
+
+
+
+
+int ring_peek(ringbuffy *rbuf, char *data, int count, long off)
+{
+
+	int diff, free, pos, rest;
+
+	if (count <=0 ) return 0;
+	pos  = rbuf->read_pos+off;
+	rest = rbuf->size - pos ;
+	diff = rbuf->write_pos - pos;
+	free = (diff >= 0) ? diff : rbuf->size+diff;
+
+	if ( free <= 0 ) return FULL_BUFFER;
+	if ( free < count ) count = free;
+	
+	if ( count < rest ){
+		memcpy(data, rbuf->buffy+pos, count);
+	} else {
+		memcpy(data, rbuf->buffy+pos, rest);
+		if ( count - rest)
+			memcpy(data+rest, rbuf->buffy, count - rest);
+	}
+
+	return count;
+}
+
+int ring_read(ringbuffy *rbuf, char *data, int count)
+{
+
+	int diff, free, pos, rest;
+
+	if (count <=0 ) return 0;
+	pos  = rbuf->read_pos;
+	rest = rbuf->size - pos;
+	diff = rbuf->write_pos - pos;
+	free = (diff >= 0) ? diff : rbuf->size+diff;
+
+	if ( rest <= 0 ) return 0;
+	if ( free < count ) count = free;
+	
+	if ( count < rest ){
+		memcpy(data, rbuf->buffy+pos, count);
+		rbuf->read_pos += count;
+	} else {
+		memcpy(data, rbuf->buffy+pos, rest);
+		if ( count - rest)
+			memcpy(data+rest, rbuf->buffy, count - rest);
+		rbuf->read_pos = count - rest;
+	}
+
+	return count;
+}
+
+
+
+int ring_write_file(ringbuffy *rbuf, int fd, int count)
+{
+
+	int diff, free, pos, rest, rr;
+
+	if (count <=0 ) return 0;
+       	pos  = rbuf->write_pos;
+	rest = rbuf->size - pos;
+	diff = rbuf->read_pos - pos;
+	free = (diff > 0) ? diff-1 : rbuf->size+diff-1;
+
+	if ( rest <= 0 ) return 0;
+	if ( free < count ) count = free;
+	
+	if (count >= rest){
+		rr = read (fd, rbuf->buffy+pos, rest);
+		if (rr == rest && count - rest)
+			rr += read (fd, rbuf->buffy, count - rest);
+		if (rr >=0)
+			rbuf->write_pos = (pos + rr) % rbuf->size;
+	} else {
+		rr = read (fd, rbuf->buffy+pos, count);
+		if (rr >=0)
+			rbuf->write_pos += rr;
+	}
+
+	return rr;
+}
+
+
+
+int ring_read_file(ringbuffy *rbuf, int fd, int count)
+{
+
+	int diff, free, pos, rest, rr;
+
+	if (count <=0 ) return 0;
+	pos  = rbuf->read_pos;
+	rest = rbuf->size - pos;
+	diff = rbuf->write_pos - pos;
+	free = (diff >= 0) ? diff : rbuf->size+diff;
+
+	if ( free <= 0 ) return FULL_BUFFER;
+	if ( free < count ) count = free;
+
+	if (count >= rest){
+		rr = write (fd, rbuf->buffy+pos, rest);
+		if (rr == rest && count - rest)
+			rr += write (fd, rbuf->buffy, count - rest);
+		if (rr >=0)
+			rbuf->read_pos = (pos + rr) % rbuf->size;
+	} else {
+		rr = write (fd, rbuf->buffy+pos, count);
+		if (rr >=0)
+			rbuf->read_pos += rr;
+	}
+
+
+	return rr;
+}
+
+int ring_rest(ringbuffy *rbuf){
+       	int diff, free, pos, rest;
+	pos  = rbuf->read_pos;
+	rest = rbuf->size - pos;
+	diff = rbuf->write_pos - pos;
+	free = (diff >= 0) ? diff : rbuf->size+diff;
+	
+	return free;
+}