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package nom.tam.util;
/*
* #%L
* nom.tam FITS library
* %%
* Copyright (C) 1996 - 2024 nom-tam-fits
* %%
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
* #L%
*/
import java.io.IOException;
import java.io.InputStream;
/**
* Interface for asic binary input reading functionality.
*
* @author Attila Kovacs
* @since 1.16
* @see OutputWriter
*/
public interface InputReader {
/**
* Reads a byte. See the general contract of
* {@link java.io.DataInputStream#read()}.
*
* @return the (unsigned) byte value or -1 if there is nothing left to read.
* @throws IOException
* if there was an underlying IO error
* @see java.io.DataInputStream#read()
*/
int read() throws IOException;
/**
* Reads up to the specified number of bytes into a buffer. See the general
* contract of {@link java.io.DataInputStream#read(byte[], int, int)}.
*
* @param b
* the buffer
* @param from
* the starting buffer index
* @param length
* the number of bytes to read.
* @return the number of bytes actually read, or -1 if there is nothing left
* to read.
* @throws IOException
* if there was an underlying IO error
* @see java.io.DataInputStream#read(byte[], int, int)
*/
int read(byte[] b, int from, int length) throws IOException;
/**
* Wraps an input stream with this interface.
*
* @param i
* any input stream
* @return the stream wrapped to this interface
*/
static InputReader from(final InputStream i) {
return new InputReader() {
@Override
public int read() throws IOException {
return i.read();
}
@Override
public int read(byte[] b, int from, int length) throws IOException {
return i.read(b, from, length);
}
};
}
}
