source: trunk/third/audiofile/libaudiofile/misc.c @ 17099

/*
        Audio File Library
        Copyright (C) 1998, Michael Pruett <michael@68k.org>

        This library is free software; you can redistribute it and/or
        modify it under the terms of the GNU Library General Public
        License as published by the Free Software Foundation; either
        version 2 of the License, or (at your option) any later version.

        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
        Library General Public License for more details.

        You should have received a copy of the GNU Library 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.
*/

/*
        misc.c

        This file contains routines for dealing with the Audio File
        Library's internal miscellaneous data types.
*/

#include <sys/types.h>
#include <stdlib.h>
#include <string.h>

#include "audiofile.h"
#include "afinternal.h"
#include "util.h"

_Miscellaneous *find_misc_by_id (AFfilehandle file, int id)
{
        int     i;

        for (i=0; i<file->miscellaneousCount; i++)
        {
                if (file->miscellaneous[i].id == id)
                        return &file->miscellaneous[i];
        }

        _af_error(AF_BAD_MISCID, "bad miscellaneous id %d", id);

        return NULL;
}

_MiscellaneousSetup *find_miscsetup_by_id (AFfilesetup setup, int id)
{
        int     i;

        for (i=0; i<setup->miscellaneousCount; i++)
        {
                if (setup->miscellaneous[i].id == id)
                        return &setup->miscellaneous[i];
        }

        _af_error(AF_BAD_MISCID, "bad miscellaneous id %d", id);

        return NULL;
}

void afInitMiscIDs (AFfilesetup setup, int *ids, int nids)
{
        int     i;

        if (!_af_filesetup_ok(setup))
                return;

        if (setup->miscellaneous != NULL)
        {
                free(setup->miscellaneous);
        }

        setup->miscellaneousCount = nids;

        if (nids == 0)
                setup->miscellaneous = NULL;
        else
        {
                setup->miscellaneous = _af_calloc(nids,
                        sizeof (_Miscellaneous));

                if (setup->miscellaneous == NULL)
                        return;

                for (i=0; i<nids; i++)
                {
                        setup->miscellaneous[i].id = ids[i];
                        setup->miscellaneous[i].type = 0;
                        setup->miscellaneous[i].size = 0;
                }
        }

        setup->miscellaneousSet = AF_TRUE;
}

int afGetMiscIDs (AFfilehandle file, int *ids)
{
        int     i;

        if (!_af_filehandle_ok(file))
                return -1;

        if (ids != NULL)
        {
                for (i=0; i<file->miscellaneousCount; i++)
                {
                        ids[i] = file->miscellaneous[i].id;
                }
        }

        return file->miscellaneousCount;
}

void afInitMiscType (AFfilesetup setup, int miscellaneousid, int type)
{
        _MiscellaneousSetup     *miscellaneous;

        if (!_af_filesetup_ok(setup))
                return;

        miscellaneous = find_miscsetup_by_id(setup, miscellaneousid);

        if (miscellaneous)
                miscellaneous->type = type;
        else
                _af_error(AF_BAD_MISCID, "bad miscellaneous id");
}

int afGetMiscType (AFfilehandle file, int miscellaneousid)
{
        _Miscellaneous  *miscellaneous;

        if (!_af_filehandle_ok(file))
                return -1;

        miscellaneous = find_misc_by_id(file, miscellaneousid);

        if (miscellaneous)
        {
                return miscellaneous->type;
        }
        else
        {
                _af_error(AF_BAD_MISCID, "bad miscellaneous id");
                return -1;
        }
}

void afInitMiscSize (AFfilesetup setup, int miscellaneousid, int size)
{
        _MiscellaneousSetup     *miscellaneous;

        if (!_af_filesetup_ok(setup))
                return;

        miscellaneous = find_miscsetup_by_id(setup, miscellaneousid);

        if (miscellaneous)
        {
                miscellaneous->size = size;
        }
        else
                _af_error(AF_BAD_MISCID, "bad miscellaneous id");
}

int afGetMiscSize (AFfilehandle file, int miscellaneousid)
{
        _Miscellaneous  *miscellaneous;

        if (!_af_filehandle_ok(file))
                return -1;

        miscellaneous = find_misc_by_id(file, miscellaneousid);

        if (miscellaneous)
        {
                return miscellaneous->size;
        }
        else
        {
                _af_error(AF_BAD_MISCID, "bad miscellaneous id");
                return -1;
        }
}

int afWriteMisc (AFfilehandle file, int miscellaneousid, void *buf, int bytes)
{
        _Miscellaneous  *miscellaneous;
        int             localsize;

        if (!_af_filehandle_ok(file))
                return -1;

        if (!_af_filehandle_can_write(file))
                return -1;

        if ((miscellaneous = find_misc_by_id(file, miscellaneousid)) == NULL)
                return -1;

        if (bytes <= 0)
        {
                _af_error(AF_BAD_MISCSIZE, "invalid size (%d) for miscellaneous chunk", bytes);
        }

        if (miscellaneous->buffer == NULL && miscellaneous->size != 0)
        {
                miscellaneous->buffer = _af_malloc(miscellaneous->size);
                memset(miscellaneous->buffer, 0, miscellaneous->size);
                if (miscellaneous->buffer == NULL)
                        return -1;
        }

        if (bytes + miscellaneous->position > miscellaneous->size)
                localsize = miscellaneous->size - miscellaneous->position;
        else
                localsize = bytes;

        memcpy((char *) miscellaneous->buffer + miscellaneous->position,
                buf, localsize);
        miscellaneous->position += localsize;
        return localsize;
}

int afReadMisc (AFfilehandle file, int miscellaneousid, void *buf, int bytes)
{
        int             localsize;
        _Miscellaneous  *miscellaneous;

        if (!_af_filehandle_ok(file))
                return -1;

        if (!_af_filehandle_can_read(file))
                return -1;

        if ((miscellaneous = find_misc_by_id(file, miscellaneousid)) == NULL)
                return -1;

        if (bytes <= 0)
        {
                _af_error(AF_BAD_MISCSIZE, "invalid size (%d) for miscellaneous chunk", bytes);
                return -1;
        }

        if (bytes + miscellaneous->position > miscellaneous->size)
                localsize = miscellaneous->size - miscellaneous->position;
        else
                localsize = bytes;

        memcpy(buf, (char *) miscellaneous->buffer + miscellaneous->position,
                localsize);
        miscellaneous->position += localsize;
        return localsize;
}

int afSeekMisc (AFfilehandle file, int miscellaneousid, int offset)
{
        _Miscellaneous  *miscellaneous;

        if (!_af_filehandle_ok(file))
                return -1;

        if ((miscellaneous = find_misc_by_id(file, miscellaneousid)) == NULL)
                return -1;

        if (offset >= miscellaneous->size)
        {
                _af_error(AF_BAD_MISCSEEK,
                        "offset %d too big for miscellaneous chunk %d "
                        "(%d data bytes)",
                        offset, miscellaneousid, miscellaneous->size);
                return -1;
        }

        miscellaneous->position = offset;

        return offset;
}