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提交 b796adb9 authored 作者: Evgenij Ryazanov's avatar Evgenij Ryazanov
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Add additional methods to Bits for double and LE byte order

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正在显示 包含 329 行增加 和 24 行删除
h2/src/java9/src/org/h2/util/Bits.java
浏览文件 @ b796adb9
......@@ -18,16 +18,45 @@ import java.util.UUID;
public final class Bits {
/**
* VarHandle giving access to elements of a byte[] array viewed as if it were a
* int[] array on big-endian system.
* VarHandle giving access to elements of a byte[] array viewed as if it
* were a int[] array on big-endian system.
*/
private static final VarHandle INT_VH = MethodHandles.byteArrayViewVarHandle(int[].class, ByteOrder.BIG_ENDIAN);
private static final VarHandle INT_VH_BE = MethodHandles.byteArrayViewVarHandle(int[].class, ByteOrder.BIG_ENDIAN);
/**
* VarHandle giving access to elements of a byte[] array viewed as if it were a
* long[] array on big-endian system.
* VarHandle giving access to elements of a byte[] array viewed as if it
* were a int[] array on little-endian system.
*/
private static final VarHandle LONG_VH = MethodHandles.byteArrayViewVarHandle(long[].class, ByteOrder.BIG_ENDIAN);
private static final VarHandle INT_VH_LE = MethodHandles.byteArrayViewVarHandle(int[].class,
ByteOrder.LITTLE_ENDIAN);
/**
* VarHandle giving access to elements of a byte[] array viewed as if it
* were a long[] array on big-endian system.
*/
private static final VarHandle LONG_VH_BE = MethodHandles.byteArrayViewVarHandle(long[].class,
ByteOrder.BIG_ENDIAN);
/**
* VarHandle giving access to elements of a byte[] array viewed as if it
* were a long[] array on little-endian system.
*/
private static final VarHandle LONG_VH_LE = MethodHandles.byteArrayViewVarHandle(long[].class,
ByteOrder.LITTLE_ENDIAN);
/**
* VarHandle giving access to elements of a byte[] array viewed as if it
* were a double[] array on big-endian system.
*/
private static final VarHandle DOUBLE_VH_BE = MethodHandles.byteArrayViewVarHandle(double[].class,
ByteOrder.BIG_ENDIAN);
/**
* VarHandle giving access to elements of a byte[] array viewed as if it
* were a double[] array on little-endian system.
*/
private static final VarHandle DOUBLE_VH_LE = MethodHandles.byteArrayViewVarHandle(double[].class,
ByteOrder.LITTLE_ENDIAN);
/**
* Compare the contents of two char arrays. If the content or length of the
......@@ -96,12 +125,26 @@ public final class Bits {
* @return the value
*/
public static int readInt(byte[] buff, int pos) {
return (int) INT_VH.get(buff, pos);
return (int) INT_VH_BE.get(buff, pos);
}
/**
* Reads a long value from the byte array at the given position in big-endian
* order.
* Reads a int value from the byte array at the given position in
* little-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @return the value
*/
public static int readIntLE(byte[] buff, int pos) {
return (int) INT_VH_LE.get(buff, pos);
}
/**
* Reads a long value from the byte array at the given position in
* big-endian order.
*
* @param buff
* the byte array
......@@ -110,7 +153,49 @@ public final class Bits {
* @return the value
*/
public static long readLong(byte[] buff, int pos) {
return (long) LONG_VH.get(buff, pos);
return (long) LONG_VH_BE.get(buff, pos);
}
/**
* Reads a long value from the byte array at the given position in
* little-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @return the value
*/
public static long readLongLE(byte[] buff, int pos) {
return (long) LONG_VH_LE.get(buff, pos);
}
/**
* Reads a double value from the byte array at the given position in
* big-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @return the value
*/
public static double readDouble(byte[] buff, int pos) {
return (double) DOUBLE_VH_BE.get(buff, pos);
}
/**
* Reads a double value from the byte array at the given position in
* little-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @return the value
*/
public static double readDoubleLE(byte[] buff, int pos) {
return (double) DOUBLE_VH_LE.get(buff, pos);
}
/**
......@@ -124,8 +209,8 @@ public final class Bits {
*/
public static byte[] uuidToBytes(long msb, long lsb) {
byte[] buff = new byte[16];
LONG_VH.set(buff, 0, msb);
LONG_VH.set(buff, 8, lsb);
LONG_VH_BE.set(buff, 0, msb);
LONG_VH_BE.set(buff, 8, lsb);
return buff;
}
......@@ -152,7 +237,22 @@ public final class Bits {
* the value to write
*/
public static void writeInt(byte[] buff, int pos, int x) {
INT_VH.set(buff, pos, x);
INT_VH_BE.set(buff, pos, x);
}
/**
* Writes a int value to the byte array at the given position in
* little-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @param x
* the value to write
*/
public static void writeIntLE(byte[] buff, int pos, int x) {
INT_VH_LE.set(buff, pos, x);
}
/**
......@@ -167,7 +267,52 @@ public final class Bits {
* the value to write
*/
public static void writeLong(byte[] buff, int pos, long x) {
LONG_VH.set(buff, pos, x);
LONG_VH_BE.set(buff, pos, x);
}
/**
* Writes a long value to the byte array at the given position in
* little-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @param x
* the value to write
*/
public static void writeLongLE(byte[] buff, int pos, long x) {
LONG_VH_LE.set(buff, pos, x);
}
/**
* Writes a double value to the byte array at the given position in
* big-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @param x
* the value to write
*/
public static void writeDouble(byte[] buff, int pos, double x) {
DOUBLE_VH_BE.set(buff, pos, x);
}
/**
* Writes a double value to the byte array at the given position in
* little-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @param x
* the value to write
*/
public static void writeDoubleLE(byte[] buff, int pos, double x) {
DOUBLE_VH_LE.set(buff, pos, x);
}
private Bits() {
......
h2/src/main/org/h2/util/Bits.java
浏览文件 @ b796adb9
......@@ -124,8 +124,22 @@ public final class Bits {
}
/**
* Reads a long value from the byte array at the given position in big-endian
* order.
* Reads a int value from the byte array at the given position in
* little-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @return the value
*/
public static int readIntLE(byte[] buff, int pos) {
return (buff[pos++] & 0xff) + ((buff[pos++] & 0xff) << 8) + ((buff[pos++] & 0xff) << 16) + (buff[pos] << 24);
}
/**
* Reads a long value from the byte array at the given position in
* big-endian order.
*
* @param buff
* the byte array
......@@ -134,7 +148,49 @@ public final class Bits {
* @return the value
*/
public static long readLong(byte[] buff, int pos) {
return (((long) readInt(buff, pos)) << 32) + (readInt(buff, pos + 4) & 0xffffffffL);
return (((long) readInt(buff, pos)) << 32) + (readInt(buff, pos + 4) & 0xffff_ffffL);
}
/**
* Reads a long value from the byte array at the given position in
* little-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @return the value
*/
public static long readLongLE(byte[] buff, int pos) {
return (readIntLE(buff, pos) & 0xffff_ffffL) + (((long) readIntLE(buff, pos + 4)) << 32);
}
/**
* Reads a double value from the byte array at the given position in
* big-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @return the value
*/
public static double readDouble(byte[] buff, int pos) {
return Double.longBitsToDouble(readLong(buff, pos));
}
/**
* Reads a double value from the byte array at the given position in
* little-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @return the value
*/
public static double readDoubleLE(byte[] buff, int pos) {
return Double.longBitsToDouble(readLongLE(buff, pos));
}
/**
......@@ -184,6 +240,24 @@ public final class Bits {
buff[pos] = (byte) x;
}
/**
* Writes a int value to the byte array at the given position in
* little-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @param x
* the value to write
*/
public static void writeIntLE(byte[] buff, int pos, int x) {
buff[pos++] = (byte) x;
buff[pos++] = (byte) (x >> 8);
buff[pos++] = (byte) (x >> 16);
buff[pos] = (byte) (x >> 24);
}
/**
* Writes a long value to the byte array at the given position in big-endian
* order.
......@@ -200,6 +274,52 @@ public final class Bits {
writeInt(buff, pos + 4, (int) x);
}
/**
* Writes a long value to the byte array at the given position in
* little-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @param x
* the value to write
*/
public static void writeLongLE(byte[] buff, int pos, long x) {
writeIntLE(buff, pos, (int) x);
writeIntLE(buff, pos + 4, (int) (x >> 32));
}
/**
* Writes a double value to the byte array at the given position in
* big-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @param x
* the value to write
*/
public static void writeDouble(byte[] buff, int pos, double x) {
writeLong(buff, pos, Double.doubleToRawLongBits(x));
}
/**
* Writes a double value to the byte array at the given position in
* little-endian order.
*
* @param buff
* the byte array
* @param pos
* the position
* @param x
* the value to write
*/
public static void writeDoubleLE(byte[] buff, int pos, double x) {
writeLongLE(buff, pos, Double.doubleToRawLongBits(x));
}
private Bits() {
}
}
h2/src/test/org/h2/test/unit/TestUtils.java
浏览文件 @ b796adb9
......@@ -47,6 +47,7 @@ public class TestUtils extends TestBase {
testIOUtils();
testSortTopN();
testSortTopNRandom();
testWriteReadInt();
testWriteReadLong();
testGetNonPrimitiveClass();
testGetNonPrimitiveClass();
......@@ -94,23 +95,62 @@ public class TestUtils extends TestBase {
}
}
private void testWriteReadInt() {
byte[] buff = new byte[4];
for (int x : new int[]{Integer.MIN_VALUE, Integer.MAX_VALUE, 0, 1, -1,
Short.MIN_VALUE, Short.MAX_VALUE}) {
testIntImpl1(buff, x);
}
Random r = new Random(1);
for (int i = 0; i < 1000; i++) {
testIntImpl1(buff, r.nextInt());
}
}
private void testIntImpl1(byte[] buff, int x) {
int r = Integer.reverseBytes(x);
Bits.writeInt(buff, 0, x);
testIntImpl2(buff, x, r);
Bits.writeIntLE(buff, 0, x);
testIntImpl2(buff, r, x);
}
private void testIntImpl2(byte[] buff, int x, int r) {
assertEquals(x, Bits.readInt(buff, 0));
assertEquals(r, Bits.readIntLE(buff, 0));
}
private void testWriteReadLong() {
byte[] buff = new byte[8];
for (long x : new long[]{Long.MIN_VALUE, Long.MAX_VALUE, 0, 1, -1,
Integer.MIN_VALUE, Integer.MAX_VALUE}) {
Bits.writeLong(buff, 0, x);
long y = Bits.readLong(buff, 0);
assertEquals(x, y);
testLongImpl1(buff, x);
}
Random r = new Random(1);
for (int i = 0; i < 1000; i++) {
long x = r.nextLong();
Bits.writeLong(buff, 0, x);
long y = Bits.readLong(buff, 0);
assertEquals(x, y);
testLongImpl1(buff, r.nextLong());
}
}
private void testLongImpl1(byte[] buff, long x) {
long r = Long.reverseBytes(x);
Bits.writeLong(buff, 0, x);
testLongImpl2(buff, x, r);
Bits.writeLongLE(buff, 0, x);
testLongImpl2(buff, r, x);
Bits.writeDouble(buff, 0, Double.longBitsToDouble(x));
testLongImpl2(buff, x, r);
Bits.writeDoubleLE(buff, 0, Double.longBitsToDouble(x));
testLongImpl2(buff, r, x);
}
private void testLongImpl2(byte[] buff, long x, long r) {
assertEquals(x, Bits.readLong(buff, 0));
assertEquals(r, Bits.readLongLE(buff, 0));
assertEquals(Double.longBitsToDouble(x), Bits.readDouble(buff, 0));
assertEquals(Double.longBitsToDouble(r), Bits.readDoubleLE(buff, 0));
}
private void testSortTopN() {
Comparator<Integer> comp = new Comparator<Integer>() {
@Override
......
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