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snd.c

/*
 * Copyright 1993 Network Computing Devices, Inc.
 * 
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name Network Computing Devices, Inc. not be
 * used in advertising or publicity pertaining to distribution of this
 * software without specific, written prior permission.
 * 
 * THIS SOFTWARE IS PROVIDED 'AS-IS'.  NETWORK COMPUTING DEVICES, INC.,
 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT
 * LIMITATION ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NONINFRINGEMENT.  IN NO EVENT SHALL NETWORK
 * COMPUTING DEVICES, INC., BE LIABLE FOR ANY DAMAGES WHATSOEVER, INCLUDING
 * SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING LOSS OF USE, DATA,
 * OR PROFITS, EVEN IF ADVISED OF THE POSSIBILITY THEREOF, AND REGARDLESS OF
 * WHETHER IN AN ACTION IN CONTRACT, TORT OR NEGLIGENCE, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 * 
 * $NCDId: @(#)snd.c,v 1.23 1995/12/06 01:23:09 greg Exp $
 */

#include "config.h"

#include <stdio.h>

#if defined(HAVE_STDLIB_H)
# include <stdlib.h> 
#endif

#if defined(HAVE_MALLOC_H)
# include <malloc.h>
#endif

#include <audio/Aos.h>
#include <audio/snd.h>
#include <audio/fileutil.h>

#define Err() { SndCloseFile(si); return NULL; }

int
SndReadFile(
            char           *p,
            int             n,
            SndInfo        *si
            )
{
    return fread(p, 1, n, si->fp);
}

int
SndWriteFile(
             char           *p,
             int             n,
             SndInfo        *si
             )
{
    int             num;

    num = fwrite(p, 1, n, si->fp);
    si->h.dataSize += num;
    return num;
}

int
SndCloseFile(SndInfo *si)
{
    int             status = 0;

    if (si->fp && si->fp != stdin && si->fp != stdout)
    {
      if (si->writing)
      {
          if (NAS_LITTLE_ENDIAN)
          {
            char            n;

            swapl(&si->h.dataSize, n);
          }

          fseek(si->fp, 8, 0);
          fwrite(&si->h.dataSize, sizeof(si->h.dataSize), 1, si->fp);
      }

      status = fclose(si->fp);
    }

    if (si->comment)
      free(si->comment);

    free(si);

    return status;
}

int
SndRewindFile(SndInfo *si)
{
    return si->writing ? -1 :
      (si->fp == stdin ? -1 : fseek(si->fp, si->h.dataOffset, 0));
}

int
SndSeekFile(
            int              n,
            SndInfo        *si
            )
{
    return si->writing ? -1 :
      (si->fp == stdin ? -1 : fseek(si->fp, si->h.dataOffset + n, 0));
}

int
SndTellFile(SndInfo *si)
{
    return si->writing ? -1 :
      (si->fp == stdin ? -1 : ftell(si->fp) - si->h.dataOffset);
}

int
SndFlushFile(SndInfo *si)
{
    return fflush(si->fp);
}

SndInfo        *
SndOpenFileForReading(_SndConst char *name)
{
    SndInfo        *si;
    int             size;

    if (!(si = (SndInfo *) malloc(sizeof(SndInfo))))
      return NULL;

    si->comment = NULL;
    si->writing = 0;

    si->fp = !strcmp("-", name) ? stdin : fopen(name, AU_READ_BINARY);

    if (!si->fp ||
      fread(&si->h, 1, sizeof(SndHeader), si->fp) != sizeof(SndHeader))
      Err();

    /* do byte swapping if necessary */
    if (NAS_LITTLE_ENDIAN)
    {
      char            n;

      swapl(&si->h.magic, n);
      swapl(&si->h.dataOffset, n);
      swapl(&si->h.dataSize, n);
      swapl(&si->h.format, n);
      swapl(&si->h.sampleRate, n);
      swapl(&si->h.tracks, n);
    }

    if (si->h.magic != SND_MAGIC_NUM)
      Err();

    size = si->h.dataOffset - sizeof(SndHeader);

    if (size)
    {
      if (!(si->comment = (char *) malloc(size + 1)))
          Err();

      if (fread(si->comment, 1, size, si->fp) != size)
          Err();

      *(si->comment + size) = 0;
    }
    else
      si->comment = FileCommentFromFilename(name);


    if (si->fp != stdin)
    {
      AuUint32 size;

      fseek(si->fp, 0, 2);
      size = ftell(si->fp) - si->h.dataOffset;
      SndRewindFile(si);

      if (si->h.dataSize == SND_DATA_SIZE_UNKNOWN || size < si->h.dataSize)
          si->h.dataSize = size;
    }

    return si;
}

SndInfo        *
SndOpenFileForWriting(
                      _SndConst char *name,
                      SndInfo        *si
                      )
{
    int             commentLen;
    SndHeader       h;

    si->writing = 0;
    commentLen = si->comment ? strlen(si->comment) : 0;
    si->h.magic = SND_MAGIC_NUM;
    si->h.dataOffset = sizeof(SndHeader) + commentLen;

    si->fp = !strcmp("-", name) ? stdout : fopen(name, AU_WRITE_BINARY);

    if (si->fp)
    {
      h = si->h;

      if (NAS_LITTLE_ENDIAN)
      {                 /* header is big-endian */
          char            n;

          swapl(&h.magic, n);
          swapl(&h.dataOffset, n);
          swapl(&h.dataSize, n);
          swapl(&h.format, n);
          swapl(&h.sampleRate, n);
          swapl(&h.tracks, n);
      }

      if (fwrite(&h, 1, sizeof(SndHeader), si->fp) == sizeof(SndHeader))
          if (!commentLen ||
            fwrite(si->comment, 1, commentLen, si->fp) == commentLen)
          {
            si->writing = 1;
            si->h.dataSize = 0;
            return si;
          }

      Err();
    }

    return NULL;
}

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