added test code for fifo

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@5684 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/tests/util/test_fifo.cpp

@@ -0,0 +1,90 @@
+// COMPILE_LINE: g++ test_fifo.cpp -o test_fifo -lstdc++ -I..
+//
+// This is a test program for fifo previewing of files.
+// Usage:
+// 	test_fifo -i [movie file]
+//
+// The program creates a named pipe /tmp/fifo.avi, to be played with e.g. mplayer
+//
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include <pgp/argstream.h>
+#include <string.h>
+#include <string>
+#include <stdexcept>
+#include <stdio.h>
+#include <errno.h>
+#define myFIFO "/tmp/fifo.avi"
+
+int main(int argc,char *argv[])
+{
+	try
+	{
+		int status, num, fifo;
+		std::string movie_name ;
+
+		argstream as(argc,argv) ;
+
+		as >> parameter('i',"input",movie_name,"file name of the movie to preview",true) 
+			>> help() ;
+
+		as.defaultErrorHandling() ;
+
+		umask(0);
+		if (mkfifo(myFIFO, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP))
+			throw std::runtime_error("Cannot create fifo") ;
+
+		fifo = open(myFIFO, O_WRONLY);
+
+		std::cerr << "Opening fifo = " << fifo << " with file name " << myFIFO << std::endl;
+
+		if(fifo < 0) 
+		{ 
+			printf("\nCan't open fifo: %s \n", strerror(errno));
+			return 0;
+		}
+
+		static const int SIZE = 1024*1024 ;	// 1 MB
+
+		void *membuf = malloc(SIZE) ;
+		FILE *f = fopen(movie_name.c_str(),"rb") ;
+		int chunk = 0;
+
+		if(f == NULL)
+			throw std::runtime_error("Cannot open movie to stream into fifo") ;
+
+		while(true) 
+		{
+			int n = fread(membuf, 1, SIZE, f) ;
+
+			if(n == 0)
+				break ;
+
+			if(write(fifo,membuf,SIZE) != n)
+				throw std::runtime_error("Could not write chunk to fifo") ;
+
+			std::cerr << "Streamed chunk " << chunk << std::endl;
+			if(n < SIZE)
+				break ;
+
+			chunk++ ;
+		}
+
+		fclose(f) ;
+		free(membuf) ;
+
+		std::cerr << "Sleeping 60 sec." << std::endl;
+		sleep(60) ;
+
+		close(fifo) ;
+		return 0 ;
+	}
+	catch(std::exception& e)
+	{
+		std::cerr << "Exception caught: " << e.what() << std::endl;
+	}
+}
+
+