1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
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20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 1991-2003 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #include <stdlib.h>
28 #include <unistd.h>
29 #include <sys/stat.h>
30 
31 #include <AudioRawPipe.h>
32 #include <libaudio.h>
33 #include <audio_hdr.h>
34 
35 // class AudioPipe methods
36 
37 // Constructor with file descriptor, mode, and optional name
38 AudioRawPipe::
AudioRawPipe(const int desc,const FileAccess acc,const AudioHdr & hdr_local,const char * name_local,const off_t off)39 AudioRawPipe(
40 	const int		desc,		// file descriptor
41 	const FileAccess	acc,		// access mode
42 	const AudioHdr&		hdr_local,	// header
43 	const char		*name_local,	// name
44 	const off_t		off		// offset
45 ):AudioPipe(desc, acc, name_local), offset(off)
46 {
47 	isopened = FALSE;
48 	setfd(desc);
49 	SetHeader(hdr_local);
50 }
51 
52 // The create routine for pipes writes a file header
53 AudioError AudioRawPipe::
Create()54 Create()
55 {
56 	AudioError	err;
57 
58 	// Was the header properly set?
59 	err = GetHeader().Validate();
60 	if (err != AUDIO_SUCCESS)
61 		return (RaiseError(err));
62 
63 	// Open fd supplied by constructor
64 	if (!isfdset() || opened()) {
65 		return (RaiseError(AUDIO_ERR_NOEFFECT, Warning));
66 	}
67 
68 	// set flag for opened() test
69 	isopened = TRUE;
70 
71 	// Set the actual output length to zero
72 	setlength(0.);
73 
74 	return (AUDIO_SUCCESS);
75 }
76 
77 // The open routine for raw pipes validates the header and
78 // init's the read pos to offset and sets the opened flag.
79 AudioError AudioRawPipe::
Open()80 Open()
81 {
82 	AudioError	err;
83 	struct stat	st;
84 
85 	// The constructor should have supplied a valid fd
86 	// If fd is not open, or file header already decoded, skip it
87 	if (!isfdset() || opened())
88 		return (RaiseError(AUDIO_ERR_NOEFFECT, Warning));
89 
90 	// Stat the file, to see if it is a regular file
91 	if (fstat(getfd(), &st) < 0)
92 		return (RaiseError(AUDIO_UNIXERROR));
93 
94 	// check validity of file header
95 	err = GetHeader().Validate();
96 	if (err != AUDIO_SUCCESS) {
97 		(void) close(getfd());
98 		setfd(-1);
99 		return (err);
100 	}
101 
102 	// Only trust the file size for regular files
103 	if (S_ISREG(st.st_mode)) {
104 		// for raw files - no hdr, so it's the whole file minus
105 		// the offset.
106 		setlength(GetHeader().Bytes_to_Time(st.st_size - offset));
107 	} else {
108 		// don't know ...
109 		setlength(AUDIO_UNKNOWN_TIME);
110 	}
111 
112 	// set flag for opened() test
113 	isopened = TRUE;
114 
115 	err = SetOffset(offset);
116 
117 	// reset logical position to 0.0, since this is, in effect,
118 	// the beginning of the file.
119 	SetReadPosition(0.0, Absolute);
120 
121 	return (err);
122 }
123 
124 Boolean AudioRawPipe::
opened() const125 opened() const
126 {
127 	return (isopened);
128 }
129 
130 AudioError AudioRawPipe::
SetOffset(off_t val)131 SetOffset(off_t val)
132 {
133 	off_t		setting = 0;
134 	AudioError	err;
135 
136 	// only read only files for now
137 	if (GetAccess().Writeable()) {
138 		return (AUDIO_ERR_NOEFFECT);
139 	}
140 
141 	// only allow this if we haven't read anything yet (i.e. current
142 	// position is 0).
143 	if (ReadPosition() != 0.) {
144 		return (AUDIO_ERR_NOEFFECT);
145 	}
146 
147 	if ((err = seekread(GetHeader().Bytes_to_Time(val), setting))
148 	    != AUDIO_SUCCESS) {
149 		return (err);
150 	}
151 
152 	// this should *never* happen 'cause seekread just sets setting
153 	// to GetHeader().Time_to_Bytes....
154 	if (setting != val) {
155 		// don't really know what error is apropos for this.
156 		return (AUDIO_ERR_BADFRAME);
157 	}
158 
159 	offset = val;
160 	return (AUDIO_SUCCESS);
161 }
162 
163 off_t AudioRawPipe::
GetOffset() const164 GetOffset() const
165 {
166 	return (offset);
167 }
168