https://openjdk.java.net/projects/openjfx/javafx-graphics/: OpenJFX JavaFX
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public class com.sun.javafx.iio.png.PNGIDATChunkInputStream extends java.io.InputStream
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.sun.javafx.iio.png.PNGIDATChunkInputStream
  super_class: java.io.InputStream
{
  static final int IDAT_TYPE;
    descriptor: I
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: 1229209940

  private java.io.DataInputStream source;
    descriptor: Ljava/io/DataInputStream;
    flags: (0x0002) ACC_PRIVATE

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

  private boolean foundAllIDATChunks;
    descriptor: Z
    flags: (0x0002) ACC_PRIVATE

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

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

  void <init>(java.io.DataInputStream, int);
    descriptor: (Ljava/io/DataInputStream;I)V
    flags: (0x0000) 
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // com.sun.javafx.iio.png.PNGIDATChunkInputStream this
        start local 1 // java.io.DataInputStream input
        start local 2 // int firstIDATChunkLength
         0: .line 65
            aload 0 /* this */
            invokespecial java.io.InputStream.<init>:()V
         1: .line 52
            aload 0 /* this */
            iconst_0
            putfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
         2: .line 53
            aload 0 /* this */
            iconst_0
            putfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.foundAllIDATChunks:Z
         3: .line 54
            aload 0 /* this */
            iconst_0
            putfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.nextChunkLength:I
         4: .line 55
            aload 0 /* this */
            iconst_0
            putfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.nextChunkType:I
         5: .line 66
            iload 2 /* firstIDATChunkLength */
            ifge 7
         6: .line 67
            new java.io.IOException
            dup
            ldc "Invalid chunk length"
            invokespecial java.io.IOException.<init>:(Ljava/lang/String;)V
            athrow
         7: .line 69
      StackMap locals: com.sun.javafx.iio.png.PNGIDATChunkInputStream java.io.DataInputStream int
      StackMap stack:
            aload 0 /* this */
            aload 1 /* input */
            putfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.source:Ljava/io/DataInputStream;
         8: .line 70
            aload 0 /* this */
            iload 2 /* firstIDATChunkLength */
            putfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
         9: .line 71
            return
        end local 2 // int firstIDATChunkLength
        end local 1 // java.io.DataInputStream input
        end local 0 // com.sun.javafx.iio.png.PNGIDATChunkInputStream this
      LocalVariableTable:
        Start  End  Slot                  Name  Signature
            0   10     0                  this  Lcom/sun/javafx/iio/png/PNGIDATChunkInputStream;
            0   10     1                 input  Ljava/io/DataInputStream;
            0   10     2  firstIDATChunkLength  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
                      Name  Flags
      input                 
      firstIDATChunkLength  

  private void nextChunk();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=3, args_size=1
        start local 0 // com.sun.javafx.iio.png.PNGIDATChunkInputStream this
         0: .line 74
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.foundAllIDATChunks:Z
            ifne 12
         1: .line 75
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.source:Ljava/io/DataInputStream;
            ldc 4
            invokestatic com.sun.javafx.iio.common.ImageTools.skipFully:(Ljava/io/InputStream;J)V
         2: .line 76
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.source:Ljava/io/DataInputStream;
            invokevirtual java.io.DataInputStream.readInt:()I
            istore 1 /* chunkLength */
        start local 1 // int chunkLength
         3: .line 77
            iload 1 /* chunkLength */
            ifge 5
         4: .line 78
            new java.io.IOException
            dup
            ldc "Invalid chunk length"
            invokespecial java.io.IOException.<init>:(Ljava/lang/String;)V
            athrow
         5: .line 80
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.source:Ljava/io/DataInputStream;
            invokevirtual java.io.DataInputStream.readInt:()I
            istore 2 /* chunkType */
        start local 2 // int chunkType
         6: .line 81
            iload 2 /* chunkType */
            ldc 1229209940
            if_icmpne 9
         7: .line 82
            aload 0 /* this */
            dup
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
            iload 1 /* chunkLength */
            iadd
            putfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
         8: .line 83
            goto 12
         9: .line 84
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            iconst_1
            putfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.foundAllIDATChunks:Z
        10: .line 85
            aload 0 /* this */
            iload 1 /* chunkLength */
            putfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.nextChunkLength:I
        11: .line 86
            aload 0 /* this */
            iload 2 /* chunkType */
            putfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.nextChunkType:I
        end local 2 // int chunkType
        end local 1 // int chunkLength
        12: .line 89
      StackMap locals:
      StackMap stack:
            return
        end local 0 // com.sun.javafx.iio.png.PNGIDATChunkInputStream this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0   13     0         this  Lcom/sun/javafx/iio/png/PNGIDATChunkInputStream;
            3   12     1  chunkLength  I
            6   12     2    chunkType  I
    Exceptions:
      throws java.io.IOException

  boolean isFoundAllIDATChunks();
    descriptor: ()Z
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.sun.javafx.iio.png.PNGIDATChunkInputStream this
         0: .line 92
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.foundAllIDATChunks:Z
            ireturn
        end local 0 // com.sun.javafx.iio.png.PNGIDATChunkInputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/sun/javafx/iio/png/PNGIDATChunkInputStream;

  int getNextChunkLength();
    descriptor: ()I
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.sun.javafx.iio.png.PNGIDATChunkInputStream this
         0: .line 96
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.nextChunkLength:I
            ireturn
        end local 0 // com.sun.javafx.iio.png.PNGIDATChunkInputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/sun/javafx/iio/png/PNGIDATChunkInputStream;

  int getNextChunkType();
    descriptor: ()I
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.sun.javafx.iio.png.PNGIDATChunkInputStream this
         0: .line 100
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.nextChunkType:I
            ireturn
        end local 0 // com.sun.javafx.iio.png.PNGIDATChunkInputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/sun/javafx/iio/png/PNGIDATChunkInputStream;

  public int read();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.sun.javafx.iio.png.PNGIDATChunkInputStream this
         0: .line 105
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
            ifne 2
         1: .line 106
            aload 0 /* this */
            invokevirtual com.sun.javafx.iio.png.PNGIDATChunkInputStream.nextChunk:()V
         2: .line 109
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
            ifne 4
         3: .line 110
            iconst_m1
            ireturn
         4: .line 112
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            dup
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
            iconst_1
            isub
            putfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
         5: .line 113
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.source:Ljava/io/DataInputStream;
            invokevirtual java.io.DataInputStream.read:()I
            ireturn
        end local 0 // com.sun.javafx.iio.png.PNGIDATChunkInputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  this  Lcom/sun/javafx/iio/png/PNGIDATChunkInputStream;
    Exceptions:
      throws java.io.IOException

  public int read(byte[], int, int);
    descriptor: ([BII)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=7, args_size=4
        start local 0 // com.sun.javafx.iio.png.PNGIDATChunkInputStream this
        start local 1 // byte[] b
        start local 2 // int off
        start local 3 // int len
         0: .line 119
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
            ifne 4
         1: .line 120
            aload 0 /* this */
            invokevirtual com.sun.javafx.iio.png.PNGIDATChunkInputStream.nextChunk:()V
         2: .line 121
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
            ifne 4
         3: .line 122
            iconst_m1
            ireturn
         4: .line 126
      StackMap locals:
      StackMap stack:
            iconst_0
            istore 4 /* totalRead */
        start local 4 // int totalRead
         5: .line 127
            goto 18
         6: .line 128
      StackMap locals: int
      StackMap stack:
            iload 3 /* len */
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
            if_icmpge 7
            iload 3 /* len */
            goto 8
      StackMap locals:
      StackMap stack:
         7: aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
      StackMap locals:
      StackMap stack: int
         8: istore 5 /* numToRead */
        start local 5 // int numToRead
         9: .line 130
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.source:Ljava/io/DataInputStream;
            aload 1 /* b */
            iload 2 /* off */
            iload 5 /* numToRead */
            invokevirtual java.io.DataInputStream.read:([BII)I
            istore 6 /* numRead */
        start local 6 // int numRead
        10: .line 131
            iload 6 /* numRead */
            iconst_m1
            if_icmpne 12
        11: .line 132
            new java.io.EOFException
            dup
            invokespecial java.io.EOFException.<init>:()V
            athrow
        12: .line 135
      StackMap locals: int int
      StackMap stack:
            aload 0 /* this */
            dup
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
            iload 6 /* numRead */
            isub
            putfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
        13: .line 136
            iload 2 /* off */
            iload 6 /* numRead */
            iadd
            istore 2 /* off */
        14: .line 137
            iload 3 /* len */
            iload 6 /* numRead */
            isub
            istore 3 /* len */
        15: .line 138
            iload 4 /* totalRead */
            iload 6 /* numRead */
            iadd
            istore 4 /* totalRead */
        16: .line 139
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
            ifne 18
            iload 3 /* len */
            ifle 18
        17: .line 140
            aload 0 /* this */
            invokevirtual com.sun.javafx.iio.png.PNGIDATChunkInputStream.nextChunk:()V
        end local 6 // int numRead
        end local 5 // int numToRead
        18: .line 127
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.sun.javafx.iio.png.PNGIDATChunkInputStream.numBytesAvailable:I
            ifle 19
            iload 3 /* len */
            ifgt 6
        19: .line 144
      StackMap locals:
      StackMap stack:
            iload 4 /* totalRead */
            ireturn
        end local 4 // int totalRead
        end local 3 // int len
        end local 2 // int off
        end local 1 // byte[] b
        end local 0 // com.sun.javafx.iio.png.PNGIDATChunkInputStream this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0   20     0       this  Lcom/sun/javafx/iio/png/PNGIDATChunkInputStream;
            0   20     1          b  [B
            0   20     2        off  I
            0   20     3        len  I
            5   20     4  totalRead  I
            9   18     5  numToRead  I
           10   18     6    numRead  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      b     
      off   
      len   
}
SourceFile: "PNGIDATChunkInputStream.java"