Microsoft/Windows2003-3790
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Windows2003-3790/enduser/netmeeting/av/codecs/dec/dech261/sc_file.c
Microsoft 50969b0ea2 First commit
2020-09-30 16:53:55 +02:00

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/*
* @DEC_COPYRIGHT@
*/
/*
* HISTORY
* $Log: sc_file.c,v $
* Revision 1.1.8.6 1996/12/12 20:54:43 Hans_Graves
* Fix some NT warnings (when linking statically).
* [1996/12/12 20:07:58 Hans_Graves]
*
* Revision 1.1.8.5 1996/11/04 22:38:38 Hans_Graves
* Fixed open/closes under NT. File closes weren't always happening.
* [1996/11/04 22:29:53 Hans_Graves]
*
* Revision 1.1.8.4 1996/10/28 17:32:18 Hans_Graves
* Replace longs with dwords for NT portability.
* [1996/10/28 16:54:46 Hans_Graves]
*
* Revision 1.1.8.3 1996/09/18 23:45:38 Hans_Graves
* Added ScFileClose() for portability
* [1996/09/18 21:53:20 Hans_Graves]
*
* Revision 1.1.8.2 1996/05/07 19:55:45 Hans_Graves
* Fix file creation under NT.
* [1996/05/07 17:11:18 Hans_Graves]
*
* Revision 1.1.6.2 1996/04/01 16:23:08 Hans_Graves
* Added ScFileOpen and ScFileRead/Write functions for portability
* [1996/04/01 16:11:56 Hans_Graves]
*
* Revision 1.1.4.3 1996/02/07 23:23:48 Hans_Graves
* Added ScFileSeek().
* [1996/02/07 23:21:55 Hans_Graves]
*
* Revision 1.1.4.2 1996/01/02 18:30:51 Bjorn_Engberg
* Got rid of compiler warnings: Added include files for NT.
* [1996/01/02 15:25:02 Bjorn_Engberg]
*
* Revision 1.1.2.5 1995/09/20 14:59:32 Bjorn_Engberg
* Port to NT
* [1995/09/20 14:41:12 Bjorn_Engberg]
*
* Revision 1.1.2.4 1995/07/12 19:48:22 Hans_Graves
* Added H261 recognition to ScFileType().
* [1995/07/12 19:33:48 Hans_Graves]
*
* Revision 1.1.2.3 1995/06/22 21:36:00 Hans_Graves
* Moved ScGetFileType() from sv_gentoc.c. Added some Audio file types.
* [1995/06/22 21:33:05 Hans_Graves]
*
* Revision 1.1.2.2 1995/05/31 18:07:49 Hans_Graves
* Inclusion in new SLIB location.
* [1995/05/31 16:13:00 Hans_Graves]
*
* Revision 1.1.2.3 1995/04/07 18:55:36 Hans_Graves
* Added FileExists()
* [1995/04/07 18:55:13 Hans_Graves]
*
* Revision 1.1.2.2 1995/04/07 18:34:21 Hans_Graves
* Inclusion in SLIB's Su library
* [1995/04/07 18:33:26 Hans_Graves]
*
* $EndLog$
*/
/*****************************************************************************
** Copyright (c) Digital Equipment Corporation, 1995 **
** **
** All Rights Reserved. Unpublished rights reserved under the copyright **
** laws of the United States. **
** **
** The software contained on this media is proprietary to and embodies **
** the confidential technology of Digital Equipment Corporation. **
** Possession, use, duplication or dissemination of the software and **
** media is authorized only pursuant to a valid written license from **
** Digital Equipment Corporation. **
** **
** RESTRICTED RIGHTS LEGEND Use, duplication, or disclosure by the U.S. **
** Government is subject to restrictions as set forth in Subparagraph **
** (c)(1)(ii) of DFARS 252.227-7013, or in FAR 52.227-19, as applicable. **
******************************************************************************/
#include <fcntl.h>
#include <sys/types.h>
#ifndef WIN32
#include <sys/mman.h>
#endif /* WIN32 */
#include <sys/stat.h>
#include "SC.h"
#include "SC_err.h"
#ifdef WIN32
#include <string.h>
#include <sys/stat.h>
#include <io.h>
#include <stdio.h>
#include <windows.h>
#endif
/*
** Name: ScFileExists
** Purpose: Does this file exist?
**
*/
ScBoolean_t ScFileExists(char *filename)
{
#ifdef WIN32
struct _stat stat_buf;
if (_stat(filename, &stat_buf))
#else
struct stat stat_buf;
if (stat(filename, &stat_buf))
#endif
return(FALSE);
else
return(TRUE);
}
/*
** Name: ScFileOpenForReading
** Purpose: Open a file for reading.
** Returns: Handle to file.
** -1 if error
*/
int ScFileOpenForReading(char *filename)
{
if (!filename)
return(-1);
#ifdef WIN32
return((int)_open(filename, _O_RDONLY|_O_BINARY));
#else /* OSF */
return((int)open(filename, O_RDONLY));
#endif
}
/*
** Name: ScFileOpenForWriting
** Purpose: Open a file for writing. Creates it if it doesn't already exist.
** Returns: Handle to file.
** -1 if error
*/
int ScFileOpenForWriting(char *filename, ScBoolean_t truncate)
{
if (!filename)
return(-1);
#ifdef WIN32
if (truncate)
return((int)_open(filename, _O_WRONLY|_O_CREAT|_O_TRUNC|_O_BINARY,
_S_IREAD|_S_IWRITE));
else
return((int)_open(filename, _O_WRONLY|_O_CREAT|_O_BINARY,
_S_IREAD|_S_IWRITE));
#else
if (truncate)
return((int)open(filename, O_WRONLY|O_CREAT|O_TRUNC,
S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH));
else
return((int)open(filename, O_WRONLY|O_CREAT,
S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH));
#endif
}
/*
** Name: ScFileSize
** Purpose: Get the size of a file in bytes
*/
ScStatus_t ScFileSize(char *filename, unsigned qword *size)
{
#ifdef WIN32
struct _stat stat_buf;
#else
struct stat stat_buf;
#endif
if (!filename || !size)
return(ScErrorBadArgument);
#ifdef WIN32
if (_stat(filename, &stat_buf) < 0)
#else
if (stat(filename, &stat_buf) < 0)
#endif
{
*size=0;
return(ScErrorFile);
}
*size=(unsigned qword)stat_buf.st_size;
return(NoErrors);
}
/*
** Name: ScFileRead
** Purpose: Read a number of bytes from a file into a buffer
** Return: Number of bytes read
** -1 if EOF
*/
dword ScFileRead(int fd, void *buffer, unsigned dword bytes)
{
#ifdef __VMS
return((long)fread(buffer, 1, bytes, fd));
#elif defined(WIN32)
return((long)_read(fd, buffer, bytes));
#else /* UNIX */
return((long)read(fd, buffer, bytes));
#endif
}
/*
** Name: ScFileWrite
** Purpose: Write a number of bytes from a buffer to a file
** Return: Number of bytes written
** 0 if error
*/
dword ScFileWrite(int fd, void *buffer, unsigned dword bytes)
{
#ifdef __VMS
return((dword)fwrite(buffer, 1, bytes, fd));
#elif defined(WIN32)
return((dword)_write(fd, buffer, bytes));
#else /* UNIX */
return((dword)write(fd, buffer, bytes));
#endif
}
/*
** Name: ScFileSeek
** Purpose: Seek to a specific position is a file
*/
ScStatus_t ScFileSeek(int fd, qword bytepos)
{
#ifdef __VMS
if (fseek(fd,bytepos,SEEK_SET)<0)
#elif defined(WIN32)
if (_lseek(fd,(long)bytepos,SEEK_SET)<0)
#else
if (lseek(fd,(long)bytepos,SEEK_SET)<0)
#endif
return(ScErrorFile);
else
return(NoErrors);
}
/*
** Name: ScFileClose
** Purpose: Close an opened file
*/
void ScFileClose(int fd)
{
if (fd>=0)
{
#ifdef WIN32
_close(fd);
#else /* UNIX or VMS */
close(fd);
#endif
}
}
/*
** Name: ScFileMap
** Purpose: Map an entire file to memory
** if fd<0 then the filename is opened for reading
** Returns: buffer = memory pointer to the mapped file
** size = size of the buffer (file)
*/
ScStatus_t ScFileMap(char *filename, int *pfd, u_char **buffer,
unsigned qword *size)
{
#ifdef WIN32
/*
* Mapping of files can be supported on NT,
* but for now return an error and implement
* file mapping later - BE.
*/
return(ScErrorMapFile);
#else /* !WIN32 */
if (!pfd || !filename || !buffer || !size)
return(ScErrorBadArgument);
if (ScFileSize(filename, size)!=NoErrors)
return(ScErrorFile);
if (*pfd<0)
{
if ((*pfd = open (filename, O_RDONLY)) < 0)
return(ScErrorFile);
}
*buffer= (unsigned char *)mmap(0, *size, PROT_READ,
MAP_FILE | MAP_VARIABLE | MAP_PRIVATE, *pfd, 0);
if (*buffer==(u_char *)-1L)
{
*buffer=NULL;
*size=0;
return(ScErrorMapFile);
}
#endif /* !WIN32 */
return(NoErrors);
}
/*
** Name: ScFileUnMap
** Purpose: UnMap a file mapped to memory
** if fd>=0 then the file is closed
*/
ScStatus_t ScFileUnMap(int fd, u_char *buffer, unsigned int size)
{
if (!buffer || !size)
return(ScErrorBadArgument);
#ifndef WIN32
if (munmap(buffer, size)<0)
#endif /* !WIN32 */
return(ScErrorMapFile);
if (fd>=0)
ScFileClose(fd);
return(NoErrors);
}
/*
** Name: ScGetFileType
** Purpose: Find out the type of a multmedia file.
** Returns: UNKNOWN_FILE, AVI_FILE, JFIF_FILE, QUICKTIME_JPEG_FILE
** MPEG_VIDEO_FILE, MPEG_AUDIO_FILE, MPEG_SYSTEM_FILE,
** GSM_FILE
*/
int ScGetFileType(char *filename)
{
int fd;
u_char buf[20];
char *fileext;
if ((fd = ScFileOpenForReading(filename)) < 0)
return(ScErrorDevOpen);
ScFileRead(fd, buf, 11);
/*
** MPEG video file
*/
if ((buf[0] == 0) &&
(buf[1] == 0) &&
(buf[2] == 1) &&
(buf[3] == 0xb3)) {
ScFileClose(fd);
return(MPEG_VIDEO_FILE);
}
/*
** MPEG system file
*/
if ((buf[0] == 0x00) &&
(buf[1] == 0x00) &&
(buf[2] == 0x01) &&
(buf[3] == 0xba)) {
ScFileClose(fd);
return(MPEG_SYSTEM_FILE);
}
/*
** H261 video stream file
*/
if ((buf[0] == 0x00) &&
(buf[1] == 0x01) &&
(buf[2] == 0x00) &&
(buf[3] == 0x88)) {
ScFileClose(fd);
return(H261_FILE);
}
/*
** JFIF file (ffd8 = Start-Of-Image marker)
*/
if ((buf[0] == 0xff) &&
(buf[1] == 0xd8)) {
ScFileClose(fd);
return(JFIF_FILE);
}
/*
** QUICKTIME JPEG file (4 ignored bytes, "mdat", ff, d8, ff)
*/
if ((strncmp(&buf[4], "mdat", 4) == 0 ) &&
(buf[8] == 0xff) &&
(buf[9] == 0xd8) &&
(buf[10] == 0xff)) {
ScFileClose(fd);
return(QUICKTIME_JPEG_FILE);
}
/******* use the file's extension to help guess the type ********/
for (fileext=filename; *fileext; fileext++)
if (*fileext=='.' && *(fileext+1)!='.')
{
fileext++;
if (strncmp(fileext, "p64", 3)==0)
{
ScFileClose(fd);
return(H261_FILE);
}
if (strncmp(fileext, "gsm", 3)==0)
{
ScFileClose(fd);
return(GSM_FILE);
}
if (strncmp(fileext, "pcm", 3)==0)
{
ScFileClose(fd);
return(PCM_FILE);
}
if (strncmp(fileext, "wav", 3)==0 && strncmp(buf, "RIFF", 4)==0)
{
ScFileClose(fd);
return(WAVE_FILE);
}
if (strncmp(fileext, "mp", 2)==0 && buf[0]==0xFF)
{
ScFileClose(fd);
return(MPEG_AUDIO_FILE);
}
break;
}
/*
** AVI RIFF file
*/
if ( strncmp(buf, "RIFF", 4) == 0 ) {
ScFileClose(fd);
return(AVI_FILE);
}
ScFileClose(fd);
return(UNKNOWN_FILE);
}
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