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/*
* Copyright (c) 1998 University of Southern California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation, advertising
* materials, and other materials related to such distribution and use
* acknowledge that the software was developed by the University of
* Southern California, Information Sciences Institute. The name of the
* University may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
*/
#ifndef nam_stream_h
#define nam_stream_h
#include <stdio.h>
#include <sys/types.h>
#ifdef WIN32
#include <windows.h>
#include <io.h>
#else
#include <unistd.h>
#endif
#include "nam.h" // for die
class NamStream : public TclObject {
protected:
int is_open_;
public:
NamStream() : is_open_(0) {};
// NamStream(int fd) : is_open_(0) {};
NamStream(const char *fn) : is_open_(0) {}
virtual ~NamStream() { if (is_open_) close(); };
int command(int argc, const char*const* argv);
static NamStream *open(const char *fn);
int is_ok() { return is_open_; }
virtual int seekable() { return 1; }
virtual char *gets(char *buf, int len) { return NULL; };
virtual char get_char() { return EOF; }
virtual char *rgets(char *buf, int len);
virtual off_t seek(off_t offset, int whence) { return -1; };
virtual off_t tell() { return -1; };
virtual int close() { is_open_ = 0; return 0; }
virtual int eof() { return 1; };
virtual int read(char *buf, int size) { return 0; }
};
class NamStreamFile : public NamStream {
FILE *file_;
public:
// NamStreamFile(int fd);
NamStreamFile(const char *fn);
virtual int seekable() { return 1; }
virtual char *gets(char *buf, int len);
virtual char get_char();
virtual off_t seek(off_t offset, int whence);
virtual off_t tell();
virtual int close();
virtual int eof();
virtual int read(char *buf, int size);
};
#ifdef HAVE_ZLIB_H
#include <zlib.h>
class NamStreamCompressedFile : public NamStream {
gzFile file_;
public:
NamStreamCompressedFile(const char *fn);
virtual int seekable() { return 0; }
virtual char *gets(char *buf, int len);
virtual char get_char();
virtual off_t seek(off_t offset, int whence);
virtual off_t tell();
virtual int close();
virtual int eof();
virtual int read(char *buf, int size);
};
#endif
/*
* Make front_ seem like a good, seekable file
* when really it's a low-down pipe.
* We do this by saving the output in back_.
*/
class NamStreamPipe : public NamStream {
protected:
int front_; // file descriptor of the pipe
FILE *back_; // temporary backup file
off_t back_len_; // file size of the backup file
char *pipename_; // the pipe name
// double linked list of all NamStreamPipe instances
NamStreamPipe *prev_;
NamStreamPipe *next_;
static NamStreamPipe *head_;
static int instances_; // number of NamStreamPipe instances
// timer to check pipe input periodically
static Tcl_TimerToken timer_;
static void timer_handler(ClientData data);
static int read_pipe();
void insure_backing(off_t lim);
public:
NamStreamPipe(const char *fn);
~NamStreamPipe();
virtual int seekable() { return 0; }
virtual char* gets(char *buf, int len);
virtual char get_char();
virtual off_t seek(off_t offset, int whence);
virtual off_t tell();
virtual int close();
virtual int eof();
virtual int read(char *buf, int size);
/*
* The Tcl command to open a pipe stream is:
* set stream [new NamStream $tracefile]
* that is, the instance construction command.
* Since this command can be executed several times on the same
* pipe, we need to make sure not to create duplicate instance.
*/
static NamStreamPipe *open_pipe(const char *fn);
};
#endif /* nam_stream_h */
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