Package nonapi.io.github.classgraph.utils

Class InputStreamOrByteBufferAdapter

  • All Implemented Interfaces:
    java.lang.AutoCloseable
    public class InputStreamOrByteBufferAdapter
extends java.lang.Object
implements java.lang.AutoCloseable
    Buffer class that can wrap either an InputStream or a ByteBuffer, depending on which is available.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      byte[] buf
      Bytes read from the beginning of the classfile, for a memory-backed ByteBuffer.
      int curr
      /** The current position in the buffer.
      int used
      Bytes used in the buffer.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void close()  
      void readInitialChunk()
      Read an initial chunk of the file into the buffer.
      int readInt()  
      int readInt​(int offset)
      Read an int from the buffer at a specific absolute offset before the current read point.
      long readLong()  
      long readLong​(int offset)
      Read a long from the buffer at a specific offset before the current read point.
      java.lang.String readString​(int strStart, boolean replaceSlashWithDot, boolean stripLSemicolon)
      Reads the "modified UTF8" format defined in the Java classfile spec, optionally replacing '/' with '.', and optionally removing the prefix "L" and the suffix ";".
      int readUnsignedByte()
      Read an unsigned byte from the buffer.
      int readUnsignedByte​(int offset)
      Read an unsigned byte from the buffer at a specific absolute offset before the current read point.
      int readUnsignedShort()  
      int readUnsignedShort​(int offset)
      Read an unsigned short from the buffer at a specific absolute offset before the current read point.
      void skip​(int bytesToSkip)
      Skip the given number of bytes in the input stream.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • buf

        public byte[] buf
        Bytes read from the beginning of the classfile, for a memory-backed ByteBuffer. This array is reused across calls.

      • curr

        public int curr
        /** The current position in the buffer.

      • used

        public int used
        Bytes used in the buffer.

    • Constructor Detail

      • InputStreamOrByteBufferAdapter

        public InputStreamOrByteBufferAdapter​(java.io.InputStream inputStream)
        Create an InputStreamOrByteBufferAdapter from an InputStream.

      • InputStreamOrByteBufferAdapter

        public InputStreamOrByteBufferAdapter​(java.nio.ByteBuffer byteBuffer)
        Create an InputStreamOrByteBufferAdapter from an InputStream.

    • Method Detail

      • readInitialChunk

        public void readInitialChunk()
                      throws java.io.IOException
        Read an initial chunk of the file into the buffer.
        Throws:
        java.io.IOException - If a chunk of the file content could not be read.

      • readUnsignedByte

        public int readUnsignedByte()
                     throws java.io.IOException
        Read an unsigned byte from the buffer.
        Returns:
        The next unsigned byte in the buffer.
        Throws:
        java.io.IOException - If there was an exception while reading.

      • readUnsignedByte

        public int readUnsignedByte​(int offset)
        Read an unsigned byte from the buffer at a specific absolute offset before the current read point.
        Parameters:
        offset - The buffer offset to read from.
        Returns:
        The unsigned byte at the buffer offset.

      • readUnsignedShort

        public int readUnsignedShort()
                      throws java.io.IOException
        Returns:
        The next unsigned short in the buffer.
        Throws:
        java.io.IOException - If there was an exception while reading.

      • readUnsignedShort

        public int readUnsignedShort​(int offset)
        Read an unsigned short from the buffer at a specific absolute offset before the current read point.
        Parameters:
        offset - The buffer offset to read from.
        Returns:
        The unsigned short at the buffer offset.

      • readInt

        public int readInt()
            throws java.io.IOException
        Returns:
        The next int in the buffer.
        Throws:
        java.io.IOException - If there was an exception while reading.

      • readInt

        public int readInt​(int offset)
        Read an int from the buffer at a specific absolute offset before the current read point.
        Parameters:
        offset - The buffer offset to read from.
        Returns:
        The int at the buffer offset.

      • readLong

        public long readLong()
              throws java.io.IOException
        Returns:
        The next long in the buffer.
        Throws:
        java.io.IOException - If there was an exception while reading.

      • readLong

        public long readLong​(int offset)
        Read a long from the buffer at a specific offset before the current read point.
        Parameters:
        offset - The buffer offset to read from.
        Returns:
        The long at the buffer offset.

      • skip

        public void skip​(int bytesToSkip)
          throws java.io.IOException
        Skip the given number of bytes in the input stream.
        Parameters:
        bytesToSkip - The number of bytes to skip.
        Throws:
        java.io.IOException - If there was an exception while reading.

      • readString

        public java.lang.String readString​(int strStart,
                                   boolean replaceSlashWithDot,
                                   boolean stripLSemicolon)
                            throws java.io.IOException
        Reads the "modified UTF8" format defined in the Java classfile spec, optionally replacing '/' with '.', and optionally removing the prefix "L" and the suffix ";".
        Parameters:
        strStart - The start index of the string.
        replaceSlashWithDot - If true, replace '/' with '.'.
        stripLSemicolon - If true, string final ';' character.
        Returns:
        The string.
        Throws:
        java.io.IOException

      • close

        public void close()
        Specified by:
        close in interface java.lang.AutoCloseable