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80 lines
2.4 KiB
Java
80 lines
2.4 KiB
Java
package java.io;
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public class DataInputStream extends FilterInputStream
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{
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public DataInputStream(InputStream in)
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{
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super(in);
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}
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/**
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* Reads bytes from the source stream into the byte array
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* <code>buffer</code>. The number of bytes actually read is returned.
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*
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* @param buffer
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* the buffer to read bytes into
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* @return the number of bytes actually read or -1 if end of stream.
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*
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* @throws IOException
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* If a problem occurs reading from this DataInputStream.
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*
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* @see DataOutput#write(byte[])
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* @see DataOutput#write(byte[], int, int)
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*/
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@Override
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public final int read(byte[] buffer) throws IOException {
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return in.read(buffer, 0, buffer.length);
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}
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/**
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* Reads a 32-bit integer value from this stream.
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*
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* @return the next <code>int</code> value from the source stream.
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*
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* @throws IOException
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* If a problem occurs reading from this DataInputStream.
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*
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* @see DataOutput#writeInt(int)
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*/
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public final int readInt() throws IOException {
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int b1 = in.read();
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int b2 = in.read();
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int b3 = in.read();
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int b4 = in.read();
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if ((b1 | b2 | b3 | b4) < 0) {
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throw new EOFException();
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}
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return ((b1 << 24) + (b2 << 16) + (b3 << 8) + b4);
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}
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/**
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* Read at most <code>length</code> bytes from this DataInputStream and
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* stores them in byte array <code>buffer</code> starting at
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* <code>offset</code>. Answer the number of bytes actually read or -1 if
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* no bytes were read and end of stream was encountered.
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*
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* @param buffer
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* the byte array in which to store the read bytes.
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* @param offset
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* the offset in <code>buffer</code> to store the read bytes.
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* @param length
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* the maximum number of bytes to store in <code>buffer</code>.
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* @return the number of bytes actually read or -1 if end of stream.
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*
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* @throws IOException
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* If a problem occurs reading from this DataInputStream.
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*
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* @see DataOutput#write(byte[])
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* @see DataOutput#write(byte[], int, int)
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*/
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@Override
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public final int read(byte[] buffer, int offset, int length)
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throws IOException {
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return in.read(buffer, offset, length);
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}
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}
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