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package uk.ac.bristol.star.cdf.test;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import uk.ac.bristol.star.cdf.record.BankBuf;
import uk.ac.bristol.star.cdf.record.Buf;
import uk.ac.bristol.star.cdf.record.Pointer;
import uk.ac.bristol.star.cdf.record.SimpleNioBuf;
public class BufTest {
private static boolean assertionsOn_;
private final int blk_ = 54;
private final int nn_ = 64;
// Puts the various Buf implementations through their paces.
public void testBufs() throws IOException {
byte[] data = new byte[ 8 * 100 ];
ByteArrayOutputStream bout = new ByteArrayOutputStream();
DataOutputStream dout = new DataOutputStream( bout );
for ( int i = 0; i < nn_; i++ ) {
dout.writeByte( -i );
dout.writeByte( i );
dout.writeShort( -i );
dout.writeShort( i );
dout.writeInt( -i );
dout.writeInt( i );
dout.writeLong( -i );
dout.writeLong( i );
dout.writeFloat( -i );
dout.writeFloat( i );
dout.writeDouble( -i );
dout.writeDouble( i );
}
dout.flush();
dout.close();
byte[] bytes = bout.toByteArray();
int nbyte = bytes.length;
assert nbyte == blk_ * nn_;
boolean isBit64 = false;
boolean isBigEndian = true;
ByteBuffer buf1 = ByteBuffer.wrap( bytes );
checkBuf( new SimpleNioBuf( buf1, isBit64, isBigEndian ) );
checkBuf( BankBuf.createSingleBankBuf( buf1, isBit64, isBigEndian ) );
checkBuf( BankBuf.createMultiBankBuf( new ByteBuffer[] { buf1 },
isBit64, isBigEndian ) );
int[] banksizes =
{ 23, blk_ - 1, blk_ + 1, 49, blk_ * 4, blk_ * 2 + 2 };
List<ByteBuffer> bblist = new ArrayList<ByteBuffer>();
int ioff = 0;
int ibuf = 0;
int nleft = nbyte;
while ( nleft > 0 ) {
int leng = Math.min( banksizes[ ibuf % banksizes.length ], nleft );
byte[] bb = new byte[ leng ];
System.arraycopy( bytes, ioff, bb, 0, leng );
bblist.add( ByteBuffer.wrap( bb ) );
ibuf++;
ioff += leng;
nleft -= leng;
}
ByteBuffer[] bbufs = bblist.toArray( new ByteBuffer[ 0 ] );
assert bbufs.length > 6;
checkBuf( BankBuf
.createMultiBankBuf( bbufs, isBit64, isBigEndian ) );
File tmpFile = File.createTempFile( "data", ".bin" );
tmpFile.deleteOnExit();
FileOutputStream fout = new FileOutputStream( tmpFile );
fout.write( bytes );
fout.close();
FileChannel inchan = new FileInputStream( tmpFile ).getChannel();
int[] banksizes2 = new int[ banksizes.length + 2 ];
System.arraycopy( banksizes, 0, banksizes2, 0, banksizes.length );
banksizes2[ banksizes.length + 0 ] = nbyte;
banksizes2[ banksizes.length + 1 ] = nbyte * 2;
for ( int banksize : banksizes2 ) {
checkBuf( BankBuf.createMultiBankBuf( inchan, nbyte, banksize,
isBit64, isBigEndian ) );
}
inchan.close();
FileChannel copychan = new FileInputStream( tmpFile ).getChannel();
assert copychan.size() == nbyte;
ByteBuffer copybuf = ByteBuffer.allocate( nbyte );
copychan.read( copybuf );
copychan.close();
assert copybuf.position() == nbyte;
checkBuf( new SimpleNioBuf( copybuf, isBit64, isBigEndian ) );
tmpFile.delete();
}
private void checkBuf( Buf buf ) throws IOException {
assert buf.getLength() == nn_ * blk_;
byte[] abytes = new byte[ 2 ];
short[] ashorts = new short[ 2 ];
int[] aints = new int[ 4 ];
long[] alongs = new long[ 2 ];
float[] afloats = new float[ 21 ];
double[] adoubles = new double[ 2 ];
for ( int i = 0; i < nn_; i++ ) {
int ioff = i * blk_;
buf.readDataBytes( ioff + 0, 2, abytes );
buf.readDataShorts( ioff + 2, 2, ashorts );
buf.readDataInts( ioff + 6, 2, aints );
buf.readDataLongs( ioff + 14, 2, alongs );
buf.readDataFloats( ioff + 30, 2, afloats );
buf.readDataDoubles( ioff + 38, 2, adoubles );
assert abytes[ 0 ] == -i;
assert abytes[ 1 ] == i;
assert ashorts[ 0 ] == -i;
assert ashorts[ 1 ] == i;
assert aints[ 0 ] == -i;
assert aints[ 1 ] == i;
assert alongs[ 0 ] == -i;
assert alongs[ 1 ] == i;
assert afloats[ 0 ] == -i;
assert afloats[ 1 ] == i;
assert adoubles[ 0 ] == -i;
assert adoubles[ 1 ] == i;
}
Pointer p = new Pointer( 0 );
assert buf.readUnsignedByte( p ) == 0;
assert buf.readUnsignedByte( p ) == 0;
p.set( blk_ );
assert buf.readUnsignedByte( p ) == 255;
assert buf.readUnsignedByte( p ) == 1;
}
private static boolean checkAssertions() {
assertionsOn_ = true;
return true;
}
private static void runTests() throws IOException {
assert checkAssertions();
if ( ! assertionsOn_ ) {
throw new RuntimeException( "Assertions disabled - bit pointless" );
}
BufTest test = new BufTest();
test.testBufs();
}
public static void main( String[] args ) throws IOException {
runTests();
}
}
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