https://commons.apache.org/proper/commons-compress/: Apache Commons Compress software defines an API for working with compression and archive formats. These include: bzip2, gzip, pack200, lzma, xz, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4, Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj. (The Apache Software Foundation)
  • Wolfgang Glas
  • Christian Kohlschütte
  • Bear Giles
  • Michael Kuss
  • Lasse Collin
  • John Kodis
  • BELUGA BEHR
  • Simon Spero
  • Michael Hausegger
  • Torsten Curdt
  • Stefan Bodewig
  • Sebastian Bazley
  • Christian Grobmeier
  • Julius Davies
  • Damjan Jovanovic
  • Emmanuel Bourg
  • Gary Gregory
  • Rob Tompkins 
public class org.apache.commons.compress.utils.BitInputStream implements java.io.Closeable
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.commons.compress.utils.BitInputStream
  super_class: java.lang.Object
{
  private static final int MAXIMUM_CACHE_SIZE;
    descriptor: I
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 63

  private static final long[] MASKS;
    descriptor: [J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private final org.apache.commons.compress.utils.CountingInputStream in;
    descriptor: Lorg/apache/commons/compress/utils/CountingInputStream;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final java.nio.ByteOrder byteOrder;
    descriptor: Ljava/nio/ByteOrder;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private long bitsCached;
    descriptor: J
    flags: (0x0002) ACC_PRIVATE

  private int bitsCachedSize;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=6, locals=1, args_size=0
         0: .line 33
            bipush 64
            newarray 11
            putstatic org.apache.commons.compress.utils.BitInputStream.MASKS:[J
         1: .line 36
            iconst_1
            istore 0 /* i */
        start local 0 // int i
         2: goto 5
         3: .line 37
      StackMap locals: int
      StackMap stack:
            getstatic org.apache.commons.compress.utils.BitInputStream.MASKS:[J
            iload 0 /* i */
            getstatic org.apache.commons.compress.utils.BitInputStream.MASKS:[J
            iload 0 /* i */
            iconst_1
            isub
            laload
            iconst_1
            lshl
            lconst_1
            ladd
            lastore
         4: .line 36
            iinc 0 /* i */ 1
      StackMap locals:
      StackMap stack:
         5: iload 0 /* i */
            bipush 63
            if_icmple 3
        end local 0 // int i
         6: .line 39
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            2    6     0     i  I

  public void <init>(java.io.InputStream, java.nio.ByteOrder);
    descriptor: (Ljava/io/InputStream;Ljava/nio/ByteOrder;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=3, args_size=3
        start local 0 // org.apache.commons.compress.utils.BitInputStream this
        start local 1 // java.io.InputStream in
        start local 2 // java.nio.ByteOrder byteOrder
         0: .line 52
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 43
            aload 0 /* this */
            lconst_0
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
         2: .line 44
            aload 0 /* this */
            iconst_0
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
         3: .line 53
            aload 0 /* this */
            new org.apache.commons.compress.utils.CountingInputStream
            dup
            aload 1 /* in */
            invokespecial org.apache.commons.compress.utils.CountingInputStream.<init>:(Ljava/io/InputStream;)V
            putfield org.apache.commons.compress.utils.BitInputStream.in:Lorg/apache/commons/compress/utils/CountingInputStream;
         4: .line 54
            aload 0 /* this */
            aload 2 /* byteOrder */
            putfield org.apache.commons.compress.utils.BitInputStream.byteOrder:Ljava/nio/ByteOrder;
         5: .line 55
            return
        end local 2 // java.nio.ByteOrder byteOrder
        end local 1 // java.io.InputStream in
        end local 0 // org.apache.commons.compress.utils.BitInputStream this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    6     0       this  Lorg/apache/commons/compress/utils/BitInputStream;
            0    6     1         in  Ljava/io/InputStream;
            0    6     2  byteOrder  Ljava/nio/ByteOrder;
    MethodParameters:
           Name  Flags
      in         final
      byteOrder  final

  public void close();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.commons.compress.utils.BitInputStream this
         0: .line 59
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.in:Lorg/apache/commons/compress/utils/CountingInputStream;
            invokevirtual org.apache.commons.compress.utils.CountingInputStream.close:()V
         1: .line 60
            return
        end local 0 // org.apache.commons.compress.utils.BitInputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/commons/compress/utils/BitInputStream;
    Exceptions:
      throws java.io.IOException

  public void clearBitCache();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.apache.commons.compress.utils.BitInputStream this
         0: .line 67
            aload 0 /* this */
            lconst_0
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
         1: .line 68
            aload 0 /* this */
            iconst_0
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
         2: .line 69
            return
        end local 0 // org.apache.commons.compress.utils.BitInputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/apache/commons/compress/utils/BitInputStream;

  public long readBits(int);
    descriptor: (I)J
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.apache.commons.compress.utils.BitInputStream this
        start local 1 // int count
         0: .line 82
            iload 1 /* count */
            iflt 1
            iload 1 /* count */
            bipush 63
            if_icmple 2
         1: .line 83
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            ldc "count must not be negative or greater than 63"
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 85
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            iload 1 /* count */
            invokevirtual org.apache.commons.compress.utils.BitInputStream.ensureCache:(I)Z
            ifeq 4
         3: .line 86
            ldc -1
            lreturn
         4: .line 89
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
            iload 1 /* count */
            if_icmpge 6
         5: .line 90
            aload 0 /* this */
            iload 1 /* count */
            invokevirtual org.apache.commons.compress.utils.BitInputStream.processBitsGreater57:(I)J
            lreturn
         6: .line 92
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            iload 1 /* count */
            invokevirtual org.apache.commons.compress.utils.BitInputStream.readCachedBits:(I)J
            lreturn
        end local 1 // int count
        end local 0 // org.apache.commons.compress.utils.BitInputStream this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    7     0   this  Lorg/apache/commons/compress/utils/BitInputStream;
            0    7     1  count  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
       Name  Flags
      count  final

  public int bitsCached();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.commons.compress.utils.BitInputStream this
         0: .line 102
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
            ireturn
        end local 0 // org.apache.commons.compress.utils.BitInputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/commons/compress/utils/BitInputStream;

  public long bitsAvailable();
    descriptor: ()J
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=1, args_size=1
        start local 0 // org.apache.commons.compress.utils.BitInputStream this
         0: .line 114
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
            i2l
            ldc 8
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.in:Lorg/apache/commons/compress/utils/CountingInputStream;
            invokevirtual org.apache.commons.compress.utils.CountingInputStream.available:()I
            i2l
            lmul
            ladd
            lreturn
        end local 0 // org.apache.commons.compress.utils.BitInputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/commons/compress/utils/BitInputStream;
    Exceptions:
      throws java.io.IOException

  public void alignWithByteBoundary();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // org.apache.commons.compress.utils.BitInputStream this
         0: .line 122
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
            bipush 8
            irem
            istore 1 /* toSkip */
        start local 1 // int toSkip
         1: .line 123
            iload 1 /* toSkip */
            ifle 3
         2: .line 124
            aload 0 /* this */
            iload 1 /* toSkip */
            invokevirtual org.apache.commons.compress.utils.BitInputStream.readCachedBits:(I)J
            pop2
         3: .line 126
      StackMap locals: int
      StackMap stack:
            return
        end local 1 // int toSkip
        end local 0 // org.apache.commons.compress.utils.BitInputStream this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    4     0    this  Lorg/apache/commons/compress/utils/BitInputStream;
            1    4     1  toSkip  I

  public long getBytesRead();
    descriptor: ()J
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.apache.commons.compress.utils.BitInputStream this
         0: .line 137
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.in:Lorg/apache/commons/compress/utils/CountingInputStream;
            invokevirtual org.apache.commons.compress.utils.CountingInputStream.getBytesRead:()J
            lreturn
        end local 0 // org.apache.commons.compress.utils.BitInputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/commons/compress/utils/BitInputStream;

  private long processBitsGreater57(int);
    descriptor: (I)J
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=6, locals=12, args_size=2
        start local 0 // org.apache.commons.compress.utils.BitInputStream this
        start local 1 // int count
         0: .line 142
            iconst_0
            istore 4 /* overflowBits */
        start local 4 // int overflowBits
         1: .line 143
            lconst_0
            lstore 5 /* overflow */
        start local 5 // long overflow
         2: .line 146
            iload 1 /* count */
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
            isub
            istore 7 /* bitsToAddCount */
        start local 7 // int bitsToAddCount
         3: .line 147
            bipush 8
            iload 7 /* bitsToAddCount */
            isub
            istore 4 /* overflowBits */
         4: .line 148
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.in:Lorg/apache/commons/compress/utils/CountingInputStream;
            invokevirtual org.apache.commons.compress.utils.CountingInputStream.read:()I
            i2l
            lstore 8 /* nextByte */
        start local 8 // long nextByte
         5: .line 149
            lload 8 /* nextByte */
            lconst_0
            lcmp
            ifge 7
         6: .line 150
            lload 8 /* nextByte */
            lreturn
         7: .line 152
      StackMap locals: org.apache.commons.compress.utils.BitInputStream int top top int long int long
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.byteOrder:Ljava/nio/ByteOrder;
            getstatic java.nio.ByteOrder.LITTLE_ENDIAN:Ljava/nio/ByteOrder;
            if_acmpne 12
         8: .line 153
            lload 8 /* nextByte */
            getstatic org.apache.commons.compress.utils.BitInputStream.MASKS:[J
            iload 7 /* bitsToAddCount */
            laload
            land
            lstore 10 /* bitsToAdd */
        start local 10 // long bitsToAdd
         9: .line 154
            aload 0 /* this */
            dup
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
            lload 10 /* bitsToAdd */
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
            lshl
            lor
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
        10: .line 155
            lload 8 /* nextByte */
            iload 7 /* bitsToAddCount */
            lushr
            getstatic org.apache.commons.compress.utils.BitInputStream.MASKS:[J
            iload 4 /* overflowBits */
            laload
            land
            lstore 5 /* overflow */
        end local 10 // long bitsToAdd
        11: .line 156
            goto 16
        12: .line 157
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            dup
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
            iload 7 /* bitsToAddCount */
            lshl
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
        13: .line 158
            lload 8 /* nextByte */
            iload 4 /* overflowBits */
            lushr
            getstatic org.apache.commons.compress.utils.BitInputStream.MASKS:[J
            iload 7 /* bitsToAddCount */
            laload
            land
            lstore 10 /* bitsToAdd */
        start local 10 // long bitsToAdd
        14: .line 159
            aload 0 /* this */
            dup
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
            lload 10 /* bitsToAdd */
            lor
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
        15: .line 160
            lload 8 /* nextByte */
            getstatic org.apache.commons.compress.utils.BitInputStream.MASKS:[J
            iload 4 /* overflowBits */
            laload
            land
            lstore 5 /* overflow */
        end local 10 // long bitsToAdd
        16: .line 162
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
            getstatic org.apache.commons.compress.utils.BitInputStream.MASKS:[J
            iload 1 /* count */
            laload
            land
            lstore 2 /* bitsOut */
        start local 2 // long bitsOut
        17: .line 163
            aload 0 /* this */
            lload 5 /* overflow */
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
        18: .line 164
            aload 0 /* this */
            iload 4 /* overflowBits */
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
        19: .line 165
            lload 2 /* bitsOut */
            lreturn
        end local 8 // long nextByte
        end local 7 // int bitsToAddCount
        end local 5 // long overflow
        end local 4 // int overflowBits
        end local 2 // long bitsOut
        end local 1 // int count
        end local 0 // org.apache.commons.compress.utils.BitInputStream this
      LocalVariableTable:
        Start  End  Slot            Name  Signature
            0   20     0            this  Lorg/apache/commons/compress/utils/BitInputStream;
            0   20     1           count  I
           17   20     2         bitsOut  J
            1   20     4    overflowBits  I
            2   20     5        overflow  J
            3   20     7  bitsToAddCount  I
            5   20     8        nextByte  J
            9   11    10       bitsToAdd  J
           14   16    10       bitsToAdd  J
    Exceptions:
      throws java.io.IOException
    MethodParameters:
       Name  Flags
      count  final

  private long readCachedBits(int);
    descriptor: (I)J
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=4, args_size=2
        start local 0 // org.apache.commons.compress.utils.BitInputStream this
        start local 1 // int count
         0: .line 170
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.byteOrder:Ljava/nio/ByteOrder;
            getstatic java.nio.ByteOrder.LITTLE_ENDIAN:Ljava/nio/ByteOrder;
            if_acmpne 4
         1: .line 171
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
            getstatic org.apache.commons.compress.utils.BitInputStream.MASKS:[J
            iload 1 /* count */
            laload
            land
            lstore 2 /* bitsOut */
        start local 2 // long bitsOut
         2: .line 172
            aload 0 /* this */
            dup
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
            iload 1 /* count */
            lushr
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
         3: .line 173
            goto 5
        end local 2 // long bitsOut
         4: .line 174
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
            iload 1 /* count */
            isub
            lshr
            getstatic org.apache.commons.compress.utils.BitInputStream.MASKS:[J
            iload 1 /* count */
            laload
            land
            lstore 2 /* bitsOut */
        start local 2 // long bitsOut
         5: .line 176
      StackMap locals: long
      StackMap stack:
            aload 0 /* this */
            dup
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
            iload 1 /* count */
            isub
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
         6: .line 177
            lload 2 /* bitsOut */
            lreturn
        end local 2 // long bitsOut
        end local 1 // int count
        end local 0 // org.apache.commons.compress.utils.BitInputStream this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    7     0     this  Lorg/apache/commons/compress/utils/BitInputStream;
            0    7     1    count  I
            2    4     2  bitsOut  J
            5    7     2  bitsOut  J
    MethodParameters:
       Name  Flags
      count  

  private boolean ensureCache(int);
    descriptor: (I)Z
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=6, locals=4, args_size=2
        start local 0 // org.apache.commons.compress.utils.BitInputStream this
        start local 1 // int count
         0: .line 187
            goto 10
         1: .line 188
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.in:Lorg/apache/commons/compress/utils/CountingInputStream;
            invokevirtual org.apache.commons.compress.utils.CountingInputStream.read:()I
            i2l
            lstore 2 /* nextByte */
        start local 2 // long nextByte
         2: .line 189
            lload 2 /* nextByte */
            lconst_0
            lcmp
            ifge 4
         3: .line 190
            iconst_1
            ireturn
         4: .line 192
      StackMap locals: long
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.byteOrder:Ljava/nio/ByteOrder;
            getstatic java.nio.ByteOrder.LITTLE_ENDIAN:Ljava/nio/ByteOrder;
            if_acmpne 7
         5: .line 193
            aload 0 /* this */
            dup
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
            lload 2 /* nextByte */
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
            lshl
            lor
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
         6: .line 194
            goto 9
         7: .line 195
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            dup
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
            bipush 8
            lshl
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
         8: .line 196
            aload 0 /* this */
            dup
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
            lload 2 /* nextByte */
            lor
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCached:J
         9: .line 198
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            dup
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
            bipush 8
            iadd
            putfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
        end local 2 // long nextByte
        10: .line 187
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
            iload 1 /* count */
            if_icmpge 11
            aload 0 /* this */
            getfield org.apache.commons.compress.utils.BitInputStream.bitsCachedSize:I
            bipush 57
            if_icmplt 1
        11: .line 200
      StackMap locals:
      StackMap stack:
            iconst_0
            ireturn
        end local 1 // int count
        end local 0 // org.apache.commons.compress.utils.BitInputStream this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0   12     0      this  Lorg/apache/commons/compress/utils/BitInputStream;
            0   12     1     count  I
            2   10     2  nextByte  J
    Exceptions:
      throws java.io.IOException
    MethodParameters:
       Name  Flags
      count  final
}
SourceFile: "BitInputStream.java"