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Copy pathjfusecdfs.java
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executable file
·312 lines (286 loc) · 8.36 KB
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package javaforce.utils;
import javaforce.*;
import javaforce.jni.*;
import javaforce.jni.lnx.*;
/**
* Mount audio CD-ROMs using libcdio.
* NOTE : requires root access to device.
* NOTE : use -oallow_other option to allow others to use mounted file system.
*
* see : http://www.gnu.org/software/libcdio/
*
* @author pquiring
*
* Created : Feb 8, 2014
*/
public class jfusecdfs extends Fuse {
//NOTE : it takes 75 sectors to make 1 second of audio (44100 * 2 * 2 / 2352 = 75)
//m = 4500 sectors each
//s = 75 sectors each
//f = x sectors
private long ptr;
private int nTracks;
private int starts[]; //starting sector #
private int lengths[]; //# of sectors
public boolean auth(String args[], String pass) {
ptr = LnxNative.cdio_open_linux(args[0]);
if (ptr == 0) {
JFLog.log("Error:Failed to open device:" + args[0]);
return false;
}
nTracks = LnxNative.cdio_get_num_tracks(ptr);
if (nTracks <= 0) {
JFLog.log("Error:no audio tracks found");
LnxNative.cdio_destroy(ptr);
ptr = 0;
return false;
}
JFLog.log("Ok:Found " + nTracks + " tracks");
starts = new int[nTracks];
lengths = new int[nTracks];
for(int a=0;a<nTracks;a++) {
starts[a] = LnxNative.cdio_get_track_lsn(ptr, a+1);
lengths[a] = LnxNative.cdio_get_track_sec_count(ptr, a+1);
}
return true;
}
public static void main(String args[]) {
if (args.length == 0) {
System.out.println("Usage : jfuse-cdfs /dev/cdrom mount");
return;
}
new jfusecdfs().main2(args);
}
public void main2(String args[]) {
try {
if (!auth(args, null)) return;
LnxNative.fuse(args, this);
LnxNative.cdio_destroy(ptr);
ptr = 0;
} catch (Exception e) {
JFLog.log("Error:" + e);
}
}
public int getattr(String path, FuseStat stat) {
// JFLog.log("getattr:" + path);
if (path.equals("/")) {
stat.folder = true;
return 0;
}
if (!path.endsWith(".wav")) return -1;
int idx1 = path.indexOf("track");
int idx2 = path.indexOf(".wav");
int track = JF.atoi(path.substring(idx1+5,idx2));
track--;
if ((track < 0) || (track >= nTracks)) return -1;
stat.size = lengths[track] * 2352 + WAV_SIZE;
return 0;
}
public int mkdir(String path, int mode) {
// JFLog.log("mkdir:" + path);
if (!path.endsWith("/")) path += "/";
try {
//TODO
return -1;
} catch (Exception e) {
JFLog.log(e);
return -1;
}
}
public int unlink(String path) {
// JFLog.log("unlink:" + path);
try {
//TODO
return -1;
} catch (Exception e) {
JFLog.log(e);
return -1;
}
}
public int rmdir(String path) {
// JFLog.log("rmdir:" + path);
if (!path.endsWith("/")) path += "/";
try {
//TODO
return -1;
} catch (Exception e) {
JFLog.log(e);
return -1;
}
}
public int symlink(String target, String link) {
// JFLog.log("symlink:" + link + "->" + target);
return -1;
}
public int link(String target, String link) {
// JFLog.log("link:" + link + "->" + target);
return -1;
}
public int chmod(String path, int mode) {
// JFLog.log("chmod:" + path);
return -1;
}
public int chown(String path, int mode) {
// JFLog.log("chown:" + path);
return -1;
}
public int truncate(String path, long size) {
// JFLog.log("truncate:" + path);
try {
//TODO
return -1;
} catch (Exception e) {
JFLog.log(e);
}
return -1;
}
private class FileState {
byte buffer[];
long offset;
int bufpos, bufsiz;
int sectors_left;
int sector_pos;
boolean canWrite;
boolean canRead;
Object lock = new Object();
byte data[] = new byte[4096]; //transfer buffer
}
//wav headers
static int RIFF_SIZE = 12;
static int FMT_SIZE = 24;
static int DATA_SIZE = 8;
static int WAV_SIZE = 44; //total header size
private void createWavHeader(FileState fs) {
byte header[] = fs.buffer;
LE.setString(header, 0, 4, "RIFF");
LE.setuint32(header, 4, 4 + FMT_SIZE + DATA_SIZE + fs.sectors_left * 2352);
LE.setString(header, 8, 4, "WAVE");
LE.setString(header, 12, 4, "fmt ");
LE.setuint32(header, 16, FMT_SIZE - 8);
LE.setuint16(header, 20, 1); //PCM format
LE.setuint16(header, 22, 2); //# channels
LE.setuint32(header, 24, 44100); //sample rate
LE.setuint32(header, 28, 44100 * 4); //byte rate
LE.setuint16(header, 32, 4); //block align (# channels * bytes/sample)
LE.setuint16(header, 34, 16); //bits/sample
LE.setString(header, 36, 4, "data");
LE.setuint32(header, 40, fs.sectors_left * 2352); //size of actual data
fs.bufsiz = header.length;
}
public int open(String path, int mode, int fd) {
// JFLog.log("open:" + path);
if (!path.endsWith(".wav")) return -1;
int idx1 = path.indexOf("track");
int idx2 = path.indexOf(".wav");
int track = JF.atoi(path.substring(idx1+5,idx2));
track--;
if ((track < 0) || (track >= nTracks)) return -1;
try {
FileState fs = new FileState();
fs.canRead = true;
fs.canWrite = false;
fs.buffer = new byte[2352 * 32];
fs.bufpos = 0;
fs.bufsiz = 0;
fs.sectors_left = lengths[track];
fs.sector_pos = starts[track];
createWavHeader(fs);
attachObject(fd, fs);
return 0;
} catch (Exception e) {
JFLog.log(e);
return -1;
}
}
public int read(String path, byte buf[], long offset, int fh) {
int size = buf.length;
// JFLog.log("read:" + path + ",size=" + size + ",offset=" + offset);
FileState fs = (FileState)getObject(fh);
if (fs == null) {
// JFLog.log("no fs");
return -1;
}
if (!fs.canRead) {
// JFLog.log("!read");
return -1;
}
int read = 0;
try {
synchronized(fs.lock) {
if (offset != fs.offset) {
JFLog.log("Error:Read not sequential");
return -1;
}
int pos = 0;
while (read != size) {
int amt = size - read;
if (amt > 4096) amt = 4096; //transfer buffer size
if (fs.bufsiz == 0) {
if (fs.sectors_left == 0) break; //no more to read
//read more sectors
int sectors_to_read = 32;
if (sectors_to_read > fs.sectors_left) sectors_to_read = fs.sectors_left;
//TODO : add fault tolerance here (jitter???)
// JFLog.log("read_sectors:pos=" + fs.sector_pos + ",len=" + sectors_to_read);
int res = LnxNative.cdio_read_audio_sectors(ptr, fs.buffer, fs.sector_pos, sectors_to_read);
if (res != 0) {
JFLog.log("Error:reading disc");
return -1;
}
fs.bufsiz = sectors_to_read * 2352;
fs.bufpos = 0;
fs.sectors_left -= sectors_to_read;
fs.sector_pos += sectors_to_read;
}
if (amt > fs.bufsiz) amt = fs.bufsiz;
System.arraycopy(fs.buffer, fs.bufpos, buf, pos, amt);
fs.bufpos += amt;
fs.bufsiz -= amt;
read += amt;
pos += amt;
}
fs.offset += read;
}
return read;
} catch (Exception e) {
JFLog.log(e);
return -1;
}
}
public int write(String path, byte buf[], long offset, int fd) {
return -1;
}
public int statfs(String path) {
// JFLog.log("statfs:" + path);
return -1;
}
public int close(String path, int fd) {
// JFLog.log("release:" + path);
FileState fs = (FileState)getObject(fd);
if (fs == null) return 0;
synchronized(fs.lock) {
detachObject(fd);
}
return 0;
}
public String[] readdir(String path) {
// JFLog.log("readdir:" + path);
if (!path.endsWith("/")) path += "/";
String dir[] = new String[nTracks];
for(int a=0;a<nTracks;a++) {
dir[a] = "track" + (a+1) + ".wav";
}
// JFLog.log("readdir done");
return dir;
}
public int create(String path, int mode, int fd) {
// JFLog.log("create:" + path);
try {
//TODO
return -1;
} catch (Exception e) {
JFLog.log(e);
}
return -1;
}
}