/* @see Codec#decompress(RandomAccessInputStream, CodecOptions) */
public byte[] decompress(RandomAccessInputStream in, CodecOptions options)
throws FormatException, IOException {
if (in == null) throw new IllegalArgumentException("No data to decompress.");
// Adapted from LZO for Java, available at
// http://www.oberhumer.com/opensource/lzo/
ByteVector dst = new ByteVector();
int t = in.read() & 0xff;
int mPos;
if (t > 17) {
t -= 17;
// do dst[op++] = src[ip++]; while (--t > 0);
byte[] b = new byte[t];
in.read(b);
dst.add(b);
t = in.read() & 0xff;
// if (t < 16) return;
if (t < 16) {
return dst.toByteArray();
}
}
loop:
for (; ; t = in.read() & 0xff) {
if (t < 16) {
if (t == 0) {
byte f = in.readByte();
while (f == 0) {
t += 255;
f = in.readByte();
}
t += 15 + (f & 0xff);
}
t += 3;
// do dst[op++] = src[ip++]; while (--t > 0);
byte[] b = new byte[t];
in.read(b);
dst.add(b);
t = in.read() & 0xff;
if (t < 16) {
mPos = dst.size() - 0x801 - (t >> 2) - ((in.read() & 0xff) << 2);
if (mPos < 0) {
t = LZO_OVERRUN;
break loop;
}
t = 3;
do {
dst.add(dst.get(mPos++));
} while (--t > 0);
// do dst[op++] = dst[mPos++]; while (--t > 0);
in.seek(in.getFilePointer() - 2);
t = in.read() & 3;
in.skipBytes(1);
if (t == 0) continue;
// do dst[op++] = src[ip++]; while (--t > 0);
b = new byte[t];
in.read(b);
dst.add(b);
t = in.read() & 0xff;
}
}
for (; ; t = in.read() & 0xff) {
if (t >= 64) {
mPos = dst.size() - 1 - ((t >> 2) & 7) - ((in.read() & 0xff) << 3);
t = (t >> 5) - 1;
} else if (t >= 32) {
t &= 31;
if (t == 0) {
byte f = in.readByte();
while (f == 0) {
t += 255;
f = in.readByte();
}
t += 31 + (f & 0xff);
}
mPos = dst.size() - 1 - ((in.read() & 0xff) >> 2);
mPos -= ((in.read() & 0xff) << 6);
} else if (t >= 16) {
mPos = dst.size() - ((t & 8) << 11);
t &= 7;
if (t == 0) {
byte f = in.readByte();
while (f == 0) {
t += 255;
f = in.readByte();
}
t += 7 + (f & 0xff);
}
mPos -= ((in.read() & 0xff) >> 2);
mPos -= ((in.read() & 0xff) << 6);
if (mPos == dst.size()) break loop;
mPos -= 0x4000;
} else {
mPos = dst.size() - 1 - (t >> 2) - ((in.read() & 0xff) << 2);
t = 0;
}
if (mPos < 0) {
t = LZO_OVERRUN;
break loop;
}
t += 2;
// do dst[op++] = dst[mPos++]; while (--t > 0);
do {
dst.add(dst.get(mPos++));
} while (--t > 0);
in.seek(in.getFilePointer() - 2);
t = in.read() & 3;
in.skipBytes(1);
if (t == 0) break;
// do dst[op++] = src[ip++]; while (--t > 0);
byte[] b = new byte[t];
in.read(b);
dst.add(b);
t = 0;
}
}
return dst.toByteArray();
}
