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org.apache.orc.impl.SerializationUtils Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.orc.impl;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigInteger;
import java.util.TimeZone;
public final class SerializationUtils {
private final static int BUFFER_SIZE = 64;
private final byte[] readBuffer;
private final byte[] writeBuffer;
public SerializationUtils() {
this.readBuffer = new byte[BUFFER_SIZE];
this.writeBuffer = new byte[BUFFER_SIZE];
}
public void writeVulong(OutputStream output,
long value) throws IOException {
while (true) {
if ((value & ~0x7f) == 0) {
output.write((byte) value);
return;
} else {
output.write((byte) (0x80 | (value & 0x7f)));
value >>>= 7;
}
}
}
public void writeVslong(OutputStream output,
long value) throws IOException {
writeVulong(output, (value << 1) ^ (value >> 63));
}
public long readVulong(InputStream in) throws IOException {
long result = 0;
long b;
int offset = 0;
do {
b = in.read();
if (b == -1) {
throw new EOFException("Reading Vulong past EOF");
}
result |= (0x7f & b) << offset;
offset += 7;
} while (b >= 0x80);
return result;
}
public long readVslong(InputStream in) throws IOException {
long result = readVulong(in);
return (result >>> 1) ^ -(result & 1);
}
public float readFloat(InputStream in) throws IOException {
readFully(in, readBuffer, 0, 4);
int val = (((readBuffer[0] & 0xff) << 0)
+ ((readBuffer[1] & 0xff) << 8)
+ ((readBuffer[2] & 0xff) << 16)
+ ((readBuffer[3] & 0xff) << 24));
return Float.intBitsToFloat(val);
}
public void writeFloat(OutputStream output,
float value) throws IOException {
int ser = Float.floatToIntBits(value);
writeBuffer[0] = (byte) ((ser >> 0) & 0xff);
writeBuffer[1] = (byte) ((ser >> 8) & 0xff);
writeBuffer[2] = (byte) ((ser >> 16) & 0xff);
writeBuffer[3] = (byte) ((ser >> 24) & 0xff);
output.write(writeBuffer, 0, 4);
}
public double readDouble(InputStream in) throws IOException {
return Double.longBitsToDouble(readLongLE(in));
}
public long readLongLE(InputStream in) throws IOException {
readFully(in, readBuffer, 0, 8);
return (((readBuffer[0] & 0xff) << 0)
+ ((readBuffer[1] & 0xff) << 8)
+ ((readBuffer[2] & 0xff) << 16)
+ ((long) (readBuffer[3] & 0xff) << 24)
+ ((long) (readBuffer[4] & 0xff) << 32)
+ ((long) (readBuffer[5] & 0xff) << 40)
+ ((long) (readBuffer[6] & 0xff) << 48)
+ ((long) (readBuffer[7] & 0xff) << 56));
}
private void readFully(final InputStream in, final byte[] buffer, final int off, final int len)
throws IOException {
int n = 0;
while (n < len) {
int count = in.read(buffer, off + n, len - n);
if (count < 0) {
throw new EOFException("Read past EOF for " + in);
}
n += count;
}
}
public void writeDouble(OutputStream output,
double value) throws IOException {
writeLongLE(output, Double.doubleToLongBits(value));
}
private void writeLongLE(OutputStream output, long value) throws IOException {
writeBuffer[0] = (byte) ((value >> 0) & 0xff);
writeBuffer[1] = (byte) ((value >> 8) & 0xff);
writeBuffer[2] = (byte) ((value >> 16) & 0xff);
writeBuffer[3] = (byte) ((value >> 24) & 0xff);
writeBuffer[4] = (byte) ((value >> 32) & 0xff);
writeBuffer[5] = (byte) ((value >> 40) & 0xff);
writeBuffer[6] = (byte) ((value >> 48) & 0xff);
writeBuffer[7] = (byte) ((value >> 56) & 0xff);
output.write(writeBuffer, 0, 8);
}
/**
* Write the arbitrarily sized signed BigInteger in vint format.
*
* Signed integers are encoded using the low bit as the sign bit using zigzag
* encoding.
*
* Each byte uses the low 7 bits for data and the high bit for stop/continue.
*
* Bytes are stored LSB first.
* @param output the stream to write to
* @param value the value to output
* @throws IOException
*/
public static void writeBigInteger(OutputStream output,
BigInteger value) throws IOException {
// encode the signed number as a positive integer
value = value.shiftLeft(1);
int sign = value.signum();
if (sign < 0) {
value = value.negate();
value = value.subtract(BigInteger.ONE);
}
int length = value.bitLength();
while (true) {
long lowBits = value.longValue() & 0x7fffffffffffffffL;
length -= 63;
// write out the next 63 bits worth of data
for(int i=0; i < 9; ++i) {
// if this is the last byte, leave the high bit off
if (length <= 0 && (lowBits & ~0x7f) == 0) {
output.write((byte) lowBits);
return;
} else {
output.write((byte) (0x80 | (lowBits & 0x7f)));
lowBits >>>= 7;
}
}
value = value.shiftRight(63);
}
}
/**
* Read the signed arbitrary sized BigInteger BigInteger in vint format
* @param input the stream to read from
* @return the read BigInteger
* @throws IOException
*/
public static BigInteger readBigInteger(InputStream input) throws IOException {
BigInteger result = BigInteger.ZERO;
long work = 0;
int offset = 0;
long b;
do {
b = input.read();
if (b == -1) {
throw new EOFException("Reading BigInteger past EOF from " + input);
}
work |= (0x7f & b) << (offset % 63);
offset += 7;
// if we've read 63 bits, roll them into the result
if (offset == 63) {
result = BigInteger.valueOf(work);
work = 0;
} else if (offset % 63 == 0) {
result = result.or(BigInteger.valueOf(work).shiftLeft(offset-63));
work = 0;
}
} while (b >= 0x80);
if (work != 0) {
result = result.or(BigInteger.valueOf(work).shiftLeft((offset/63)*63));
}
// convert back to a signed number
boolean isNegative = result.testBit(0);
if (isNegative) {
result = result.add(BigInteger.ONE);
result = result.negate();
}
result = result.shiftRight(1);
return result;
}
public enum FixedBitSizes {
ONE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN, ELEVEN, TWELVE,
THIRTEEN, FOURTEEN, FIFTEEN, SIXTEEN, SEVENTEEN, EIGHTEEN, NINETEEN,
TWENTY, TWENTYONE, TWENTYTWO, TWENTYTHREE, TWENTYFOUR, TWENTYSIX,
TWENTYEIGHT, THIRTY, THIRTYTWO, FORTY, FORTYEIGHT, FIFTYSIX, SIXTYFOUR;
}
/**
* Count the number of bits required to encode the given value
* @param value
* @return bits required to store value
*/
public int findClosestNumBits(long value) {
int count = 0;
while (value != 0) {
count++;
value = value >>> 1;
}
return getClosestFixedBits(count);
}
/**
* zigzag encode the given value
* @param val
* @return zigzag encoded value
*/
public long zigzagEncode(long val) {
return (val << 1) ^ (val >> 63);
}
/**
* zigzag decode the given value
* @param val
* @return zizag decoded value
*/
public long zigzagDecode(long val) {
return (val >>> 1) ^ -(val & 1);
}
/**
* Compute the bits required to represent pth percentile value
* @param data - array
* @param p - percentile value (>=0.0 to <=1.0)
* @return pth percentile bits
*/
public int percentileBits(long[] data, int offset, int length,
double p) {
if ((p > 1.0) || (p <= 0.0)) {
return -1;
}
// histogram that store the encoded bit requirement for each values.
// maximum number of bits that can encoded is 32 (refer FixedBitSizes)
int[] hist = new int[32];
// compute the histogram
for(int i = offset; i < (offset + length); i++) {
int idx = encodeBitWidth(findClosestNumBits(data[i]));
hist[idx] += 1;
}
int perLen = (int) (length * (1.0 - p));
// return the bits required by pth percentile length
for(int i = hist.length - 1; i >= 0; i--) {
perLen -= hist[i];
if (perLen < 0) {
return decodeBitWidth(i);
}
}
return 0;
}
/**
* Read n bytes in big endian order and convert to long
* @return long value
*/
public long bytesToLongBE(InStream input, int n) throws IOException {
long out = 0;
long val = 0;
while (n > 0) {
n--;
// store it in a long and then shift else integer overflow will occur
val = input.read();
out |= (val << (n * 8));
}
return out;
}
/**
* Calculate the number of bytes required
* @param n - number of values
* @param numBits - bit width
* @return number of bytes required
*/
int getTotalBytesRequired(int n, int numBits) {
return (n * numBits + 7) / 8;
}
/**
* For a given fixed bit this function will return the closest available fixed
* bit
* @param n
* @return closest valid fixed bit
*/
public int getClosestFixedBits(int n) {
if (n == 0) {
return 1;
}
if (n >= 1 && n <= 24) {
return n;
} else if (n > 24 && n <= 26) {
return 26;
} else if (n > 26 && n <= 28) {
return 28;
} else if (n > 28 && n <= 30) {
return 30;
} else if (n > 30 && n <= 32) {
return 32;
} else if (n > 32 && n <= 40) {
return 40;
} else if (n > 40 && n <= 48) {
return 48;
} else if (n > 48 && n <= 56) {
return 56;
} else {
return 64;
}
}
public int getClosestAlignedFixedBits(int n) {
if (n == 0 || n == 1) {
return 1;
} else if (n > 1 && n <= 2) {
return 2;
} else if (n > 2 && n <= 4) {
return 4;
} else if (n > 4 && n <= 8) {
return 8;
} else if (n > 8 && n <= 16) {
return 16;
} else if (n > 16 && n <= 24) {
return 24;
} else if (n > 24 && n <= 32) {
return 32;
} else if (n > 32 && n <= 40) {
return 40;
} else if (n > 40 && n <= 48) {
return 48;
} else if (n > 48 && n <= 56) {
return 56;
} else {
return 64;
}
}
/**
* Finds the closest available fixed bit width match and returns its encoded
* value (ordinal)
* @param n - fixed bit width to encode
* @return encoded fixed bit width
*/
public int encodeBitWidth(int n) {
n = getClosestFixedBits(n);
if (n >= 1 && n <= 24) {
return n - 1;
} else if (n > 24 && n <= 26) {
return FixedBitSizes.TWENTYSIX.ordinal();
} else if (n > 26 && n <= 28) {
return FixedBitSizes.TWENTYEIGHT.ordinal();
} else if (n > 28 && n <= 30) {
return FixedBitSizes.THIRTY.ordinal();
} else if (n > 30 && n <= 32) {
return FixedBitSizes.THIRTYTWO.ordinal();
} else if (n > 32 && n <= 40) {
return FixedBitSizes.FORTY.ordinal();
} else if (n > 40 && n <= 48) {
return FixedBitSizes.FORTYEIGHT.ordinal();
} else if (n > 48 && n <= 56) {
return FixedBitSizes.FIFTYSIX.ordinal();
} else {
return FixedBitSizes.SIXTYFOUR.ordinal();
}
}
/**
* Decodes the ordinal fixed bit value to actual fixed bit width value
* @param n - encoded fixed bit width
* @return decoded fixed bit width
*/
public int decodeBitWidth(int n) {
if (n >= FixedBitSizes.ONE.ordinal()
&& n <= FixedBitSizes.TWENTYFOUR.ordinal()) {
return n + 1;
} else if (n == FixedBitSizes.TWENTYSIX.ordinal()) {
return 26;
} else if (n == FixedBitSizes.TWENTYEIGHT.ordinal()) {
return 28;
} else if (n == FixedBitSizes.THIRTY.ordinal()) {
return 30;
} else if (n == FixedBitSizes.THIRTYTWO.ordinal()) {
return 32;
} else if (n == FixedBitSizes.FORTY.ordinal()) {
return 40;
} else if (n == FixedBitSizes.FORTYEIGHT.ordinal()) {
return 48;
} else if (n == FixedBitSizes.FIFTYSIX.ordinal()) {
return 56;
} else {
return 64;
}
}
/**
* Bitpack and write the input values to underlying output stream
* @param input - values to write
* @param offset - offset
* @param len - length
* @param bitSize - bit width
* @param output - output stream
* @throws IOException
*/
public void writeInts(long[] input, int offset, int len, int bitSize,
OutputStream output) throws IOException {
if (input == null || input.length < 1 || offset < 0 || len < 1
|| bitSize < 1) {
return;
}
switch (bitSize) {
case 1:
unrolledBitPack1(input, offset, len, output);
return;
case 2:
unrolledBitPack2(input, offset, len, output);
return;
case 4:
unrolledBitPack4(input, offset, len, output);
return;
case 8:
unrolledBitPack8(input, offset, len, output);
return;
case 16:
unrolledBitPack16(input, offset, len, output);
return;
case 24:
unrolledBitPack24(input, offset, len, output);
return;
case 32:
unrolledBitPack32(input, offset, len, output);
return;
case 40:
unrolledBitPack40(input, offset, len, output);
return;
case 48:
unrolledBitPack48(input, offset, len, output);
return;
case 56:
unrolledBitPack56(input, offset, len, output);
return;
case 64:
unrolledBitPack64(input, offset, len, output);
return;
default:
break;
}
int bitsLeft = 8;
byte current = 0;
for(int i = offset; i < (offset + len); i++) {
long value = input[i];
int bitsToWrite = bitSize;
while (bitsToWrite > bitsLeft) {
// add the bits to the bottom of the current word
current |= value >>> (bitsToWrite - bitsLeft);
// subtract out the bits we just added
bitsToWrite -= bitsLeft;
// zero out the bits above bitsToWrite
value &= (1L << bitsToWrite) - 1;
output.write(current);
current = 0;
bitsLeft = 8;
}
bitsLeft -= bitsToWrite;
current |= value << bitsLeft;
if (bitsLeft == 0) {
output.write(current);
current = 0;
bitsLeft = 8;
}
}
// flush
if (bitsLeft != 8) {
output.write(current);
current = 0;
bitsLeft = 8;
}
}
private void unrolledBitPack1(long[] input, int offset, int len,
OutputStream output) throws IOException {
final int numHops = 8;
final int remainder = len % numHops;
final int endOffset = offset + len;
final int endUnroll = endOffset - remainder;
int val = 0;
for (int i = offset; i < endUnroll; i = i + numHops) {
val = (int) (val | ((input[i] & 1) << 7)
| ((input[i + 1] & 1) << 6)
| ((input[i + 2] & 1) << 5)
| ((input[i + 3] & 1) << 4)
| ((input[i + 4] & 1) << 3)
| ((input[i + 5] & 1) << 2)
| ((input[i + 6] & 1) << 1)
| (input[i + 7]) & 1);
output.write(val);
val = 0;
}
if (remainder > 0) {
int startShift = 7;
for (int i = endUnroll; i < endOffset; i++) {
val = (int) (val | (input[i] & 1) << startShift);
startShift -= 1;
}
output.write(val);
}
}
private void unrolledBitPack2(long[] input, int offset, int len,
OutputStream output) throws IOException {
final int numHops = 4;
final int remainder = len % numHops;
final int endOffset = offset + len;
final int endUnroll = endOffset - remainder;
int val = 0;
for (int i = offset; i < endUnroll; i = i + numHops) {
val = (int) (val | ((input[i] & 3) << 6)
| ((input[i + 1] & 3) << 4)
| ((input[i + 2] & 3) << 2)
| (input[i + 3]) & 3);
output.write(val);
val = 0;
}
if (remainder > 0) {
int startShift = 6;
for (int i = endUnroll; i < endOffset; i++) {
val = (int) (val | (input[i] & 3) << startShift);
startShift -= 2;
}
output.write(val);
}
}
private void unrolledBitPack4(long[] input, int offset, int len,
OutputStream output) throws IOException {
final int numHops = 2;
final int remainder = len % numHops;
final int endOffset = offset + len;
final int endUnroll = endOffset - remainder;
int val = 0;
for (int i = offset; i < endUnroll; i = i + numHops) {
val = (int) (val | ((input[i] & 15) << 4) | (input[i + 1]) & 15);
output.write(val);
val = 0;
}
if (remainder > 0) {
int startShift = 4;
for (int i = endUnroll; i < endOffset; i++) {
val = (int) (val | (input[i] & 15) << startShift);
startShift -= 4;
}
output.write(val);
}
}
private void unrolledBitPack8(long[] input, int offset, int len,
OutputStream output) throws IOException {
unrolledBitPackBytes(input, offset, len, output, 1);
}
private void unrolledBitPack16(long[] input, int offset, int len,
OutputStream output) throws IOException {
unrolledBitPackBytes(input, offset, len, output, 2);
}
private void unrolledBitPack24(long[] input, int offset, int len,
OutputStream output) throws IOException {
unrolledBitPackBytes(input, offset, len, output, 3);
}
private void unrolledBitPack32(long[] input, int offset, int len,
OutputStream output) throws IOException {
unrolledBitPackBytes(input, offset, len, output, 4);
}
private void unrolledBitPack40(long[] input, int offset, int len,
OutputStream output) throws IOException {
unrolledBitPackBytes(input, offset, len, output, 5);
}
private void unrolledBitPack48(long[] input, int offset, int len,
OutputStream output) throws IOException {
unrolledBitPackBytes(input, offset, len, output, 6);
}
private void unrolledBitPack56(long[] input, int offset, int len,
OutputStream output) throws IOException {
unrolledBitPackBytes(input, offset, len, output, 7);
}
private void unrolledBitPack64(long[] input, int offset, int len,
OutputStream output) throws IOException {
unrolledBitPackBytes(input, offset, len, output, 8);
}
private void unrolledBitPackBytes(long[] input, int offset, int len, OutputStream output, int numBytes) throws IOException {
final int numHops = 8;
final int remainder = len % numHops;
final int endOffset = offset + len;
final int endUnroll = endOffset - remainder;
int i = offset;
for (; i < endUnroll; i = i + numHops) {
writeLongBE(output, input, i, numHops, numBytes);
}
if (remainder > 0) {
writeRemainingLongs(output, i, input, remainder, numBytes);
}
}
private void writeRemainingLongs(OutputStream output, int offset, long[] input, int remainder,
int numBytes) throws IOException {
final int numHops = remainder;
int idx = 0;
switch (numBytes) {
case 1:
while (remainder > 0) {
writeBuffer[idx] = (byte) (input[offset + idx] & 255);
remainder--;
idx++;
}
break;
case 2:
while (remainder > 0) {
writeLongBE2(output, input[offset + idx], idx * 2);
remainder--;
idx++;
}
break;
case 3:
while (remainder > 0) {
writeLongBE3(output, input[offset + idx], idx * 3);
remainder--;
idx++;
}
break;
case 4:
while (remainder > 0) {
writeLongBE4(output, input[offset + idx], idx * 4);
remainder--;
idx++;
}
break;
case 5:
while (remainder > 0) {
writeLongBE5(output, input[offset + idx], idx * 5);
remainder--;
idx++;
}
break;
case 6:
while (remainder > 0) {
writeLongBE6(output, input[offset + idx], idx * 6);
remainder--;
idx++;
}
break;
case 7:
while (remainder > 0) {
writeLongBE7(output, input[offset + idx], idx * 7);
remainder--;
idx++;
}
break;
case 8:
while (remainder > 0) {
writeLongBE8(output, input[offset + idx], idx * 8);
remainder--;
idx++;
}
break;
default:
break;
}
final int toWrite = numHops * numBytes;
output.write(writeBuffer, 0, toWrite);
}
private void writeLongBE(OutputStream output, long[] input, int offset, int numHops, int numBytes) throws IOException {
switch (numBytes) {
case 1:
writeBuffer[0] = (byte) (input[offset + 0] & 255);
writeBuffer[1] = (byte) (input[offset + 1] & 255);
writeBuffer[2] = (byte) (input[offset + 2] & 255);
writeBuffer[3] = (byte) (input[offset + 3] & 255);
writeBuffer[4] = (byte) (input[offset + 4] & 255);
writeBuffer[5] = (byte) (input[offset + 5] & 255);
writeBuffer[6] = (byte) (input[offset + 6] & 255);
writeBuffer[7] = (byte) (input[offset + 7] & 255);
break;
case 2:
writeLongBE2(output, input[offset + 0], 0);
writeLongBE2(output, input[offset + 1], 2);
writeLongBE2(output, input[offset + 2], 4);
writeLongBE2(output, input[offset + 3], 6);
writeLongBE2(output, input[offset + 4], 8);
writeLongBE2(output, input[offset + 5], 10);
writeLongBE2(output, input[offset + 6], 12);
writeLongBE2(output, input[offset + 7], 14);
break;
case 3:
writeLongBE3(output, input[offset + 0], 0);
writeLongBE3(output, input[offset + 1], 3);
writeLongBE3(output, input[offset + 2], 6);
writeLongBE3(output, input[offset + 3], 9);
writeLongBE3(output, input[offset + 4], 12);
writeLongBE3(output, input[offset + 5], 15);
writeLongBE3(output, input[offset + 6], 18);
writeLongBE3(output, input[offset + 7], 21);
break;
case 4:
writeLongBE4(output, input[offset + 0], 0);
writeLongBE4(output, input[offset + 1], 4);
writeLongBE4(output, input[offset + 2], 8);
writeLongBE4(output, input[offset + 3], 12);
writeLongBE4(output, input[offset + 4], 16);
writeLongBE4(output, input[offset + 5], 20);
writeLongBE4(output, input[offset + 6], 24);
writeLongBE4(output, input[offset + 7], 28);
break;
case 5:
writeLongBE5(output, input[offset + 0], 0);
writeLongBE5(output, input[offset + 1], 5);
writeLongBE5(output, input[offset + 2], 10);
writeLongBE5(output, input[offset + 3], 15);
writeLongBE5(output, input[offset + 4], 20);
writeLongBE5(output, input[offset + 5], 25);
writeLongBE5(output, input[offset + 6], 30);
writeLongBE5(output, input[offset + 7], 35);
break;
case 6:
writeLongBE6(output, input[offset + 0], 0);
writeLongBE6(output, input[offset + 1], 6);
writeLongBE6(output, input[offset + 2], 12);
writeLongBE6(output, input[offset + 3], 18);
writeLongBE6(output, input[offset + 4], 24);
writeLongBE6(output, input[offset + 5], 30);
writeLongBE6(output, input[offset + 6], 36);
writeLongBE6(output, input[offset + 7], 42);
break;
case 7:
writeLongBE7(output, input[offset + 0], 0);
writeLongBE7(output, input[offset + 1], 7);
writeLongBE7(output, input[offset + 2], 14);
writeLongBE7(output, input[offset + 3], 21);
writeLongBE7(output, input[offset + 4], 28);
writeLongBE7(output, input[offset + 5], 35);
writeLongBE7(output, input[offset + 6], 42);
writeLongBE7(output, input[offset + 7], 49);
break;
case 8:
writeLongBE8(output, input[offset + 0], 0);
writeLongBE8(output, input[offset + 1], 8);
writeLongBE8(output, input[offset + 2], 16);
writeLongBE8(output, input[offset + 3], 24);
writeLongBE8(output, input[offset + 4], 32);
writeLongBE8(output, input[offset + 5], 40);
writeLongBE8(output, input[offset + 6], 48);
writeLongBE8(output, input[offset + 7], 56);
break;
default:
break;
}
final int toWrite = numHops * numBytes;
output.write(writeBuffer, 0, toWrite);
}
private void writeLongBE2(OutputStream output, long val, int wbOffset) {
writeBuffer[wbOffset + 0] = (byte) (val >>> 8);
writeBuffer[wbOffset + 1] = (byte) (val >>> 0);
}
private void writeLongBE3(OutputStream output, long val, int wbOffset) {
writeBuffer[wbOffset + 0] = (byte) (val >>> 16);
writeBuffer[wbOffset + 1] = (byte) (val >>> 8);
writeBuffer[wbOffset + 2] = (byte) (val >>> 0);
}
private void writeLongBE4(OutputStream output, long val, int wbOffset) {
writeBuffer[wbOffset + 0] = (byte) (val >>> 24);
writeBuffer[wbOffset + 1] = (byte) (val >>> 16);
writeBuffer[wbOffset + 2] = (byte) (val >>> 8);
writeBuffer[wbOffset + 3] = (byte) (val >>> 0);
}
private void writeLongBE5(OutputStream output, long val, int wbOffset) {
writeBuffer[wbOffset + 0] = (byte) (val >>> 32);
writeBuffer[wbOffset + 1] = (byte) (val >>> 24);
writeBuffer[wbOffset + 2] = (byte) (val >>> 16);
writeBuffer[wbOffset + 3] = (byte) (val >>> 8);
writeBuffer[wbOffset + 4] = (byte) (val >>> 0);
}
private void writeLongBE6(OutputStream output, long val, int wbOffset) {
writeBuffer[wbOffset + 0] = (byte) (val >>> 40);
writeBuffer[wbOffset + 1] = (byte) (val >>> 32);
writeBuffer[wbOffset + 2] = (byte) (val >>> 24);
writeBuffer[wbOffset + 3] = (byte) (val >>> 16);
writeBuffer[wbOffset + 4] = (byte) (val >>> 8);
writeBuffer[wbOffset + 5] = (byte) (val >>> 0);
}
private void writeLongBE7(OutputStream output, long val, int wbOffset) {
writeBuffer[wbOffset + 0] = (byte) (val >>> 48);
writeBuffer[wbOffset + 1] = (byte) (val >>> 40);
writeBuffer[wbOffset + 2] = (byte) (val >>> 32);
writeBuffer[wbOffset + 3] = (byte) (val >>> 24);
writeBuffer[wbOffset + 4] = (byte) (val >>> 16);
writeBuffer[wbOffset + 5] = (byte) (val >>> 8);
writeBuffer[wbOffset + 6] = (byte) (val >>> 0);
}
private void writeLongBE8(OutputStream output, long val, int wbOffset) {
writeBuffer[wbOffset + 0] = (byte) (val >>> 56);
writeBuffer[wbOffset + 1] = (byte) (val >>> 48);
writeBuffer[wbOffset + 2] = (byte) (val >>> 40);
writeBuffer[wbOffset + 3] = (byte) (val >>> 32);
writeBuffer[wbOffset + 4] = (byte) (val >>> 24);
writeBuffer[wbOffset + 5] = (byte) (val >>> 16);
writeBuffer[wbOffset + 6] = (byte) (val >>> 8);
writeBuffer[wbOffset + 7] = (byte) (val >>> 0);
}
/**
* Read bitpacked integers from input stream
* @param buffer - input buffer
* @param offset - offset
* @param len - length
* @param bitSize - bit width
* @param input - input stream
* @throws IOException
*/
public void readInts(long[] buffer, int offset, int len, int bitSize,
InStream input) throws IOException {
int bitsLeft = 0;
int current = 0;
switch (bitSize) {
case 1:
unrolledUnPack1(buffer, offset, len, input);
return;
case 2:
unrolledUnPack2(buffer, offset, len, input);
return;
case 4:
unrolledUnPack4(buffer, offset, len, input);
return;
case 8:
unrolledUnPack8(buffer, offset, len, input);
return;
case 16:
unrolledUnPack16(buffer, offset, len, input);
return;
case 24:
unrolledUnPack24(buffer, offset, len, input);
return;
case 32:
unrolledUnPack32(buffer, offset, len, input);
return;
case 40:
unrolledUnPack40(buffer, offset, len, input);
return;
case 48:
unrolledUnPack48(buffer, offset, len, input);
return;
case 56:
unrolledUnPack56(buffer, offset, len, input);
return;
case 64:
unrolledUnPack64(buffer, offset, len, input);
return;
default:
break;
}
for(int i = offset; i < (offset + len); i++) {
long result = 0;
int bitsLeftToRead = bitSize;
while (bitsLeftToRead > bitsLeft) {
result <<= bitsLeft;
result |= current & ((1 << bitsLeft) - 1);
bitsLeftToRead -= bitsLeft;
current = input.read();
bitsLeft = 8;
}
// handle the left over bits
if (bitsLeftToRead > 0) {
result <<= bitsLeftToRead;
bitsLeft -= bitsLeftToRead;
result |= (current >> bitsLeft) & ((1 << bitsLeftToRead) - 1);
}
buffer[i] = result;
}
}
private void unrolledUnPack1(long[] buffer, int offset, int len,
InStream input) throws IOException {
final int numHops = 8;
final int remainder = len % numHops;
final int endOffset = offset + len;
final int endUnroll = endOffset - remainder;
int val = 0;
for (int i = offset; i < endUnroll; i = i + numHops) {
val = input.read();
buffer[i] = (val >>> 7) & 1;
buffer[i + 1] = (val >>> 6) & 1;
buffer[i + 2] = (val >>> 5) & 1;
buffer[i + 3] = (val >>> 4) & 1;
buffer[i + 4] = (val >>> 3) & 1;
buffer[i + 5] = (val >>> 2) & 1;
buffer[i + 6] = (val >>> 1) & 1;
buffer[i + 7] = val & 1;
}
if (remainder > 0) {
int startShift = 7;
val = input.read();
for (int i = endUnroll; i < endOffset; i++) {
buffer[i] = (val >>> startShift) & 1;
startShift -= 1;
}
}
}
private void unrolledUnPack2(long[] buffer, int offset, int len,
InStream input) throws IOException {
final int numHops = 4;
final int remainder = len % numHops;
final int endOffset = offset + len;
final int endUnroll = endOffset - remainder;
int val = 0;
for (int i = offset; i < endUnroll; i = i + numHops) {
val = input.read();
buffer[i] = (val >>> 6) & 3;
buffer[i + 1] = (val >>> 4) & 3;
buffer[i + 2] = (val >>> 2) & 3;
buffer[i + 3] = val & 3;
}
if (remainder > 0) {
int startShift = 6;
val = input.read();
for (int i = endUnroll; i < endOffset; i++) {
buffer[i] = (val >>> startShift) & 3;
startShift -= 2;
}
}
}
private void unrolledUnPack4(long[] buffer, int offset, int len,
InStream input) throws IOException {
final int numHops = 2;
final int remainder = len % numHops;
final int endOffset = offset + len;
final int endUnroll = endOffset - remainder;
int val = 0;
for (int i = offset; i < endUnroll; i = i + numHops) {
val = input.read();
buffer[i] = (val >>> 4) & 15;
buffer[i + 1] = val & 15;
}
if (remainder > 0) {
int startShift = 4;
val = input.read();
for (int i = endUnroll; i < endOffset; i++) {
buffer[i] = (val >>> startShift) & 15;
startShift -= 4;
}
}
}
private void unrolledUnPack8(long[] buffer, int offset, int len,
InStream input) throws IOException {
unrolledUnPackBytes(buffer, offset, len, input, 1);
}
private void unrolledUnPack16(long[] buffer, int offset, int len,
InStream input) throws IOException {
unrolledUnPackBytes(buffer, offset, len, input, 2);
}
private void unrolledUnPack24(long[] buffer, int offset, int len,
InStream input) throws IOException {
unrolledUnPackBytes(buffer, offset, len, input, 3);
}
private void unrolledUnPack32(long[] buffer, int offset, int len,
InStream input) throws IOException {
unrolledUnPackBytes(buffer, offset, len, input, 4);
}
private void unrolledUnPack40(long[] buffer, int offset, int len,
InStream input) throws IOException {
unrolledUnPackBytes(buffer, offset, len, input, 5);
}
private void unrolledUnPack48(long[] buffer, int offset, int len,
InStream input) throws IOException {
unrolledUnPackBytes(buffer, offset, len, input, 6);
}
private void unrolledUnPack56(long[] buffer, int offset, int len,
InStream input) throws IOException {
unrolledUnPackBytes(buffer, offset, len, input, 7);
}
private void unrolledUnPack64(long[] buffer, int offset, int len,
InStream input) throws IOException {
unrolledUnPackBytes(buffer, offset, len, input, 8);
}
private void unrolledUnPackBytes(long[] buffer, int offset, int len, InStream input, int numBytes)
throws IOException {
final int numHops = 8;
final int remainder = len % numHops;
final int endOffset = offset + len;
final int endUnroll = endOffset - remainder;
int i = offset;
for (; i < endUnroll; i = i + numHops) {
readLongBE(input, buffer, i, numHops, numBytes);
}
if (remainder > 0) {
readRemainingLongs(buffer, i, input, remainder, numBytes);
}
}
private void readRemainingLongs(long[] buffer, int offset, InStream input, int remainder,
int numBytes) throws IOException {
final int toRead = remainder * numBytes;
// bulk read to buffer
int bytesRead = input.read(readBuffer, 0, toRead);
while (bytesRead != toRead) {
bytesRead += input.read(readBuffer, bytesRead, toRead - bytesRead);
}
int idx = 0;
switch (numBytes) {
case 1:
while (remainder > 0) {
buffer[offset++] = readBuffer[idx] & 255;
remainder--;
idx++;
}
break;
case 2:
while (remainder > 0) {
buffer[offset++] = readLongBE2(input, idx * 2);
remainder--;
idx++;
}
break;
case 3:
while (remainder > 0) {
buffer[offset++] = readLongBE3(input, idx * 3);
remainder--;
idx++;
}
break;
case 4:
while (remainder > 0) {
buffer[offset++] = readLongBE4(input, idx * 4);
remainder--;
idx++;
}
break;
case 5:
while (remainder > 0) {
buffer[offset++] = readLongBE5(input, idx * 5);
remainder--;
idx++;
}
break;
case 6:
while (remainder > 0) {
buffer[offset++] = readLongBE6(input, idx * 6);
remainder--;
idx++;
}
break;
case 7:
while (remainder > 0) {
buffer[offset++] = readLongBE7(input, idx * 7);
remainder--;
idx++;
}
break;
case 8:
while (remainder > 0) {
buffer[offset++] = readLongBE8(input, idx * 8);
remainder--;
idx++;
}
break;
default:
break;
}
}
private void readLongBE(InStream in, long[] buffer, int start, int numHops, int numBytes)
throws IOException {
final int toRead = numHops * numBytes;
// bulk read to buffer
int bytesRead = in.read(readBuffer, 0, toRead);
while (bytesRead != toRead) {
bytesRead += in.read(readBuffer, bytesRead, toRead - bytesRead);
}
switch (numBytes) {
case 1:
buffer[start + 0] = readBuffer[0] & 255;
buffer[start + 1] = readBuffer[1] & 255;
buffer[start + 2] = readBuffer[2] & 255;
buffer[start + 3] = readBuffer[3] & 255;
buffer[start + 4] = readBuffer[4] & 255;
buffer[start + 5] = readBuffer[5] & 255;
buffer[start + 6] = readBuffer[6] & 255;
buffer[start + 7] = readBuffer[7] & 255;
break;
case 2:
buffer[start + 0] = readLongBE2(in, 0);
buffer[start + 1] = readLongBE2(in, 2);
buffer[start + 2] = readLongBE2(in, 4);
buffer[start + 3] = readLongBE2(in, 6);
buffer[start + 4] = readLongBE2(in, 8);
buffer[start + 5] = readLongBE2(in, 10);
buffer[start + 6] = readLongBE2(in, 12);
buffer[start + 7] = readLongBE2(in, 14);
break;
case 3:
buffer[start + 0] = readLongBE3(in, 0);
buffer[start + 1] = readLongBE3(in, 3);
buffer[start + 2] = readLongBE3(in, 6);
buffer[start + 3] = readLongBE3(in, 9);
buffer[start + 4] = readLongBE3(in, 12);
buffer[start + 5] = readLongBE3(in, 15);
buffer[start + 6] = readLongBE3(in, 18);
buffer[start + 7] = readLongBE3(in, 21);
break;
case 4:
buffer[start + 0] = readLongBE4(in, 0);
buffer[start + 1] = readLongBE4(in, 4);
buffer[start + 2] = readLongBE4(in, 8);
buffer[start + 3] = readLongBE4(in, 12);
buffer[start + 4] = readLongBE4(in, 16);
buffer[start + 5] = readLongBE4(in, 20);
buffer[start + 6] = readLongBE4(in, 24);
buffer[start + 7] = readLongBE4(in, 28);
break;
case 5:
buffer[start + 0] = readLongBE5(in, 0);
buffer[start + 1] = readLongBE5(in, 5);
buffer[start + 2] = readLongBE5(in, 10);
buffer[start + 3] = readLongBE5(in, 15);
buffer[start + 4] = readLongBE5(in, 20);
buffer[start + 5] = readLongBE5(in, 25);
buffer[start + 6] = readLongBE5(in, 30);
buffer[start + 7] = readLongBE5(in, 35);
break;
case 6:
buffer[start + 0] = readLongBE6(in, 0);
buffer[start + 1] = readLongBE6(in, 6);
buffer[start + 2] = readLongBE6(in, 12);
buffer[start + 3] = readLongBE6(in, 18);
buffer[start + 4] = readLongBE6(in, 24);
buffer[start + 5] = readLongBE6(in, 30);
buffer[start + 6] = readLongBE6(in, 36);
buffer[start + 7] = readLongBE6(in, 42);
break;
case 7:
buffer[start + 0] = readLongBE7(in, 0);
buffer[start + 1] = readLongBE7(in, 7);
buffer[start + 2] = readLongBE7(in, 14);
buffer[start + 3] = readLongBE7(in, 21);
buffer[start + 4] = readLongBE7(in, 28);
buffer[start + 5] = readLongBE7(in, 35);
buffer[start + 6] = readLongBE7(in, 42);
buffer[start + 7] = readLongBE7(in, 49);
break;
case 8:
buffer[start + 0] = readLongBE8(in, 0);
buffer[start + 1] = readLongBE8(in, 8);
buffer[start + 2] = readLongBE8(in, 16);
buffer[start + 3] = readLongBE8(in, 24);
buffer[start + 4] = readLongBE8(in, 32);
buffer[start + 5] = readLongBE8(in, 40);
buffer[start + 6] = readLongBE8(in, 48);
buffer[start + 7] = readLongBE8(in, 56);
break;
default:
break;
}
}
private long readLongBE2(InStream in, int rbOffset) {
return (((readBuffer[rbOffset] & 255) << 8)
+ ((readBuffer[rbOffset + 1] & 255) << 0));
}
private long readLongBE3(InStream in, int rbOffset) {
return (((readBuffer[rbOffset] & 255) << 16)
+ ((readBuffer[rbOffset + 1] & 255) << 8)
+ ((readBuffer[rbOffset + 2] & 255) << 0));
}
private long readLongBE4(InStream in, int rbOffset) {
return (((long) (readBuffer[rbOffset] & 255) << 24)
+ ((readBuffer[rbOffset + 1] & 255) << 16)
+ ((readBuffer[rbOffset + 2] & 255) << 8)
+ ((readBuffer[rbOffset + 3] & 255) << 0));
}
private long readLongBE5(InStream in, int rbOffset) {
return (((long) (readBuffer[rbOffset] & 255) << 32)
+ ((long) (readBuffer[rbOffset + 1] & 255) << 24)
+ ((readBuffer[rbOffset + 2] & 255) << 16)
+ ((readBuffer[rbOffset + 3] & 255) << 8)
+ ((readBuffer[rbOffset + 4] & 255) << 0));
}
private long readLongBE6(InStream in, int rbOffset) {
return (((long) (readBuffer[rbOffset] & 255) << 40)
+ ((long) (readBuffer[rbOffset + 1] & 255) << 32)
+ ((long) (readBuffer[rbOffset + 2] & 255) << 24)
+ ((readBuffer[rbOffset + 3] & 255) << 16)
+ ((readBuffer[rbOffset + 4] & 255) << 8)
+ ((readBuffer[rbOffset + 5] & 255) << 0));
}
private long readLongBE7(InStream in, int rbOffset) {
return (((long) (readBuffer[rbOffset] & 255) << 48)
+ ((long) (readBuffer[rbOffset + 1] & 255) << 40)
+ ((long) (readBuffer[rbOffset + 2] & 255) << 32)
+ ((long) (readBuffer[rbOffset + 3] & 255) << 24)
+ ((readBuffer[rbOffset + 4] & 255) << 16)
+ ((readBuffer[rbOffset + 5] & 255) << 8)
+ ((readBuffer[rbOffset + 6] & 255) << 0));
}
private long readLongBE8(InStream in, int rbOffset) {
return (((long) (readBuffer[rbOffset] & 255) << 56)
+ ((long) (readBuffer[rbOffset + 1] & 255) << 48)
+ ((long) (readBuffer[rbOffset + 2] & 255) << 40)
+ ((long) (readBuffer[rbOffset + 3] & 255) << 32)
+ ((long) (readBuffer[rbOffset + 4] & 255) << 24)
+ ((readBuffer[rbOffset + 5] & 255) << 16)
+ ((readBuffer[rbOffset + 6] & 255) << 8)
+ ((readBuffer[rbOffset + 7] & 255) << 0));
}
// Do not want to use Guava LongMath.checkedSubtract() here as it will throw
// ArithmeticException in case of overflow
public boolean isSafeSubtract(long left, long right) {
return (left ^ right) >= 0 | (left ^ (left - right)) >= 0;
}
public static long convertFromUtc(TimeZone local, long time) {
int offset = local.getOffset(time - local.getRawOffset());
return time - offset;
}
public static long convertToUtc(TimeZone local, long time) {
int offset = local.getOffset(time);
return time + offset;
}
}
