/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
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/*
 * Copyright 1991-2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>

#include <AudioRawPipe.h>
#include <libaudio.h>
#include <audio_hdr.h>

// class AudioPipe methods

// Constructor with file descriptor, mode, and optional name
AudioRawPipe::
AudioRawPipe(
        const int               desc,           // file descriptor
        const FileAccess        acc,            // access mode
        const AudioHdr&         hdr_local,      // header
        const char              *name_local,    // name
        const off_t             off             // offset
):AudioPipe(desc, acc, name_local), offset(off)
{
        isopened = FALSE;
        setfd(desc);
        SetHeader(hdr_local);
}

// The create routine for pipes writes a file header
AudioError AudioRawPipe::
Create()
{
        AudioError      err;

        // Was the header properly set?
        err = GetHeader().Validate();
        if (err != AUDIO_SUCCESS)
                return (RaiseError(err));

        // Open fd supplied by constructor
        if (!isfdset() || opened()) {
                return (RaiseError(AUDIO_ERR_NOEFFECT, Warning));
        }

        // set flag for opened() test
        isopened = TRUE;

        // Set the actual output length to zero
        setlength(0.);

        return (AUDIO_SUCCESS);
}

// The open routine for raw pipes validates the header and
// init's the read pos to offset and sets the opened flag.
AudioError AudioRawPipe::
Open()
{
        AudioError      err;
        struct stat     st;

        // The constructor should have supplied a valid fd
        // If fd is not open, or file header already decoded, skip it
        if (!isfdset() || opened())
                return (RaiseError(AUDIO_ERR_NOEFFECT, Warning));

        // Stat the file, to see if it is a regular file
        if (fstat(getfd(), &st) < 0)
                return (RaiseError(AUDIO_UNIXERROR));

        // check validity of file header
        err = GetHeader().Validate();
        if (err != AUDIO_SUCCESS) {
                (void) close(getfd());
                setfd(-1);
                return (err);
        }

        // Only trust the file size for regular files
        if (S_ISREG(st.st_mode)) {
                // for raw files - no hdr, so it's the whole file minus
                // the offset.
                setlength(GetHeader().Bytes_to_Time(st.st_size - offset));
        } else {
                // don't know ...
                setlength(AUDIO_UNKNOWN_TIME);
        }

        // set flag for opened() test
        isopened = TRUE;

        err = SetOffset(offset);

        // reset logical position to 0.0, since this is, in effect,
        // the beginning of the file.
        SetReadPosition(0.0, Absolute);

        return (err);
}

Boolean AudioRawPipe::
opened() const
{
        return (isopened);
}

AudioError AudioRawPipe::
SetOffset(off_t val)
{
        off_t           setting = 0;
        AudioError      err;

        // only read only files for now
        if (GetAccess().Writeable()) {
                return (AUDIO_ERR_NOEFFECT);
        }

        // only allow this if we haven't read anything yet (i.e. current
        // position is 0).
        if (ReadPosition() != 0.) {
                return (AUDIO_ERR_NOEFFECT);
        }

        if ((err = seekread(GetHeader().Bytes_to_Time(val), setting))
            != AUDIO_SUCCESS) {
                return (err);
        }

        // this should *never* happen 'cause seekread just sets setting
        // to GetHeader().Time_to_Bytes....
        if (setting != val) {
                // don't really know what error is apropos for this.
                return (AUDIO_ERR_BADFRAME);
        }

        offset = val;
        return (AUDIO_SUCCESS);
}

off_t AudioRawPipe::
GetOffset() const
{
        return (offset);
}