inputfile.cpp

流媒体传输协议的实现代码,非常有用.可以支持rtsp mms等流媒体传输协议

/**********
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)

This library 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 Lesser General Public License for
more details.

You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
**********/
// "liveMedia"
// Copyright (c) 1996-2004 Live Networks, Inc.  All rights reserved.
// Common routines for opening/closing named input files
// Implementation

#if (defined(__WIN32__) || defined(_WIN32)) && !defined(_WIN32_WCE)
#include <io.h>
#include <fcntl.h>
#endif
#ifndef _WIN32_WCE
#include <sys/stat.h>
#endif
#include <string.h>

#include "InputFile.hh"

FILE* OpenInputFile(UsageEnvironment& env, char const* fileName) {
  FILE* fid;

  // Check for a special case file name: "stdin"
  if (strcmp(fileName, "stdin") == 0) {
    fid = stdin;
#if defined(__WIN32__) || defined(_WIN32)
    _setmode(_fileno(stdin), _O_BINARY); // convert to binary mode
#endif
  } else { 
    fid = fopen(fileName, "rb");
    if (fid == NULL) {
      env.setResultMsg("unable to open file \"",fileName, "\"");
    }
  }

  return fid;
}

void CloseInputFile(FILE* fid) {
  // Don't close 'stdin', in case we want to use it again later.
  if (fid != NULL && fid != stdin) fclose(fid);
}

unsigned GetFileSize(char const* fileName, FILE* fid) {
  unsigned fileSize = 0; // by default

  if (fid != stdin) {
#if !defined(_WIN32_WCE)
    if (fileName == NULL) {
#endif
      if (fseek(fid, 0, SEEK_END) >= 0) {
	fileSize = ftell(fid);
	if (fileSize == (unsigned)-1) fileSize = 0; // ftell() failed
	fseek(fid, 0, SEEK_SET);
      }
#if !defined(_WIN32_WCE)
    } else {
      struct stat sb;
      if (stat(fileName, &sb) == 0) {
	fileSize = sb.st_size;
      }
    }
#endif
  }

  return fileSize;
}