net.sourceforge.plantuml.code.deflate.ByteBitInputStream Maven / Gradle / Ivy
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
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package net.sourceforge.plantuml.code.deflate;
/*
* Simple DEFLATE decompressor
* Copyright (c) Project Nayuki
*
* https://www.nayuki.io/page/simple-deflate-decompressor
* https://github.com/nayuki/Simple-DEFLATE-decompressor
*/
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Objects;
/**
* A stream of bits that can be read. Because they come from an underlying byte
* stream, the total number of bits is always a multiple of 8. The bits are read
* in little endian. Mutable and not thread-safe.
*/
public final class ByteBitInputStream implements BitInputStream {
/*---- Fields ----*/
// The underlying byte stream to read from (not null).
private InputStream input;
// Either in the range [0x00, 0xFF] if bits are available, or -1 if end of
// stream is reached.
private int currentByte;
// Number of remaining bits in the current byte, always between 0 and 7
// (inclusive).
private int numBitsRemaining;
/*---- Constructor ----*/
/**
* Constructs a bit input stream based on the specified byte input stream.
*
* @param in the byte input stream (not {@code null})
* @throws NullPointerException if the input stream is {@code null}
*/
public ByteBitInputStream(InputStream in) {
input = Objects.requireNonNull(in);
currentByte = 0;
numBitsRemaining = 0;
}
/*---- Methods ----*/
public int getBitPosition() {
if (numBitsRemaining < 0 || numBitsRemaining > 7)
throw new IllegalStateException();
return (8 - numBitsRemaining) % 8;
}
public int readByte() throws IOException {
currentByte = 0;
numBitsRemaining = 0;
return input.read();
}
public int read() throws IOException {
if (currentByte == -1)
return -1;
if (numBitsRemaining == 0) {
currentByte = input.read();
if (currentByte == -1)
return -1;
numBitsRemaining = 8;
}
if (numBitsRemaining <= 0)
throw new IllegalStateException();
numBitsRemaining--;
return (currentByte >>> (7 - numBitsRemaining)) & 1;
}
public int readNoEof() throws IOException {
int result = read();
if (result == -1)
throw new EOFException();
return result;
}
public void close() throws IOException {
input.close();
currentByte = -1;
numBitsRemaining = 0;
}
}