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org.archive.util.ByteOp Maven / Gradle / Ivy
package org.archive.util;
import java.io.DataInput;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class ByteOp {
private static int MAX_READ_SIZE = 128 * 1024;
public static byte[] copy(byte[] src) {
return copy(src,0,src.length);
}
public static byte[] copy(byte[] src, int offset, int length) {
byte[] copy = new byte[length];
System.arraycopy(src, offset, copy, 0, length);
return copy;
}
public static boolean cmp(byte[] input, byte[] want) {
if (input.length != want.length) {
return false;
}
for (int i = 0; i < input.length; i++) {
if (input[i] != want[i]) {
return false;
}
}
return true;
}
public static boolean cmp(byte[] b1, int src1, byte[] b2, int src2, int n) {
if(b1.length < src1 + n) {
throw new IndexOutOfBoundsException();
}
if(b2.length < src2 + n) {
throw new IndexOutOfBoundsException();
}
for(int i = 0; i < n; i++) {
if(b1[src1 + i] != b2[src2 + i]) {
return false;
}
}
return true;
}
public static byte[] append(byte a[], byte b[]) {
byte n[] = new byte[a.length + b.length];
System.arraycopy(a, 0, n, 0, a.length);
System.arraycopy(b, 0, n, a.length,b.length);
return n;
}
public static int bytesToShort(int b1, int b2) {
return ((b2 << 8) & 0x00ff00) | (b1 & 0xff);
}
public static int bytesToShort(byte[] bytes, int offset) {
if(bytes.length - offset < 2) {
throw new IndexOutOfBoundsException();
}
return bytesToShort(bytes[offset],bytes[offset+1]);
}
public static int bytesToShort(byte[] bytes) {
return bytesToShort(bytes,0);
}
public static int readShort(DataInput in) throws IOException {
return bytesToShort(in.readByte(), in.readByte());
}
public static int readShort(InputStream is) throws IOException {
int b1 = is.read();
if(b1 == -1) {
throw new EOFException("No bytes expected short(2)");
}
int b2 = is.read();
if(b2 == -1) {
throw new EOFException("One byte expected short(2)");
}
return bytesToShort(b1,b2);
}
public static void writeShort(OutputStream os, int shortVal) throws IOException {
os.write((byte) (shortVal & 0xff));
os.write((byte) (((shortVal & 0x00ff00) >> 8) & 0xff));
}
public static void writeShort(byte buf[], int offset, int shortVal) {
if(buf.length - offset < 2) {
throw new IndexOutOfBoundsException();
}
buf[offset + 0] = (byte) (shortVal & 0xff);
buf[offset + 1] = (byte) (((shortVal & 0x00ff00) >> 8) & 0xff);
}
public static long bytesToInt(int b1, int b2, int b3, int b4) {
long res = (b1 & 0xff) | ((b2 << 8) & 0x00ff00) |
((b3 << 16) & 0x00ff0000) | ((b4 << 24) & 0xff000000);
return res;
}
public static long bytesToInt(byte[] bytes, int offset) {
if(bytes.length - offset < 4) {
throw new IndexOutOfBoundsException();
}
return bytesToInt(
bytes[offset],
bytes[offset+1],
bytes[offset+2],
bytes[offset+3]);
}
public static long bytesToInt(byte[] bytes) {
return bytesToInt(bytes,0);
}
public static long readInt(DataInput in) throws IOException {
return
bytesToInt(in.readByte(),in.readByte(),in.readByte(),in.readByte());
}
public static long readInt(InputStream is) throws IOException {
int b1 = is.read();
if(b1 == -1) {
throw new EOFException("No bytes for Int(4)");
}
int b2 = is.read();
if(b2 == -1) {
throw new EOFException("Only 1 bytes for Int(4)");
}
int b3 = is.read();
if(b3 == -1) {
throw new EOFException("Only 2 bytes for Int(4)");
}
int b4 = is.read();
if(b4 == -1) {
throw new EOFException("Only 3 bytes for Int(4)");
}
return bytesToInt(b1, b2, b3, b4);
}
public static void writeInt(OutputStream os, long intVal) throws IOException {
os.write((byte) (intVal & 0xff));
os.write((byte) (((intVal & 0x00ff00) >> 8) & 0xff));
os.write((byte) (((intVal & 0x00ff0000) >> 16) & 0xff));
os.write((byte) (((intVal & 0x00ff000000) >> 24) & 0xff));
}
public static void writeInt(byte buf[], int offset, long intVal) {
if(buf.length - offset < 4) {
throw new IndexOutOfBoundsException();
}
buf[offset + 0] = (byte) (intVal & 0xff);
buf[offset + 1] = (byte) (((intVal & 0x00ff00) >> 8) & 0xff);
buf[offset + 2] = (byte) (((intVal & 0x00ff0000) >> 16) & 0xff);
buf[offset + 3] = (byte) (((intVal & 0x00ff000000) >> 24) & 0xff);
}
public static byte[] readNBytes(InputStream is, int n)
throws IOException {
byte[] b = new byte[n];
int left = n;
while(left > 0) {
int amt = is.read(b,n-left,left);
if(amt == -1) {
throw new EOFException("Short read");
}
left -= amt;
}
return b;
}
/**
* Read, buffer, and return bytes from is until a null byte is encountered
* @param is InputStream to read from
* @return array of bytes read, INCLUDING TRAILING NULL
* @throws IOException if the underlying stream throws on, OR if the default
* maximum buffer size is reached before a null byte is found
* @throws ShortByteReadException if EOF is encountered before a null byte
*/
public static byte[] readToNull(InputStream is) throws IOException {
return readToNull(is,MAX_READ_SIZE);
}
/**
* Read, buffer, and return bytes from is until a null byte is encountered
* @param is InputStream to read from
* @param maxSize maximum number of bytes to search for the null
* @return array of bytes read, INCLUDING TRAILING NULL
* @throws IOException if the underlying stream throws on, OR if the
* specified maximum buffer size is reached before a null byte is found
* @throws ShortByteReadException if EOF is encountered before a null byte
*/
public static byte[] readToNull(InputStream is, int maxSize)
throws IOException {
byte[] bytes = new byte[maxSize];
int i = 0;
while(i < maxSize) {
int b = is.read();
if(b == -1) {
throw new EOFException("NO NULL");
}
bytes[i] = (byte) (b & 0xff);
i++;
if(b == 0) {
return copy(bytes,0,i);
}
}
// BUGBUG: This isn't the right exception!!!
// TODO: just skip any more bytes until NULL or EOF
// throw an EOF if we find it... produce warning, too
throw new IOException("Buffer too small");
}
public static int discardToNull(InputStream is)
throws IOException {
int i = 0;
while(true) {
int b = is.read();
if(b == -1) {
throw new EOFException("No NULL before EOF");
}
i++;
if(b == 0) {
return i;
}
}
}
public static String drawHex(byte[] b) {
return drawHex(b,b.length);
}
public static String drawHex(byte[] b, int bytesPerRow) {
return drawHex(b,0,b.length,bytesPerRow);
}
public static String drawHex(byte[] b, int offset, int length, int bytesPerRow) {
int rows = (int) Math.ceil(length / bytesPerRow);
if(rows == 0) {
rows = 1;
}
int bytesToOutput = length;
int position = 0;
// 2 chars per byte, plus 1 space, plus 1 newline per row:
StringBuilder sb = new StringBuilder((length * 3) + rows);
for(int row = 0; row < rows; row++) {
int bytesThisRow = Math.min(bytesToOutput, bytesPerRow);
for(int col = 0; col < bytesThisRow; col++) {
String hex = Integer.toHexString(b[position++] & 0xff);
if(hex.length() == 2) {
sb.append(hex);
} else {
sb.append("0").append(hex);
}
// sb.append(" ");
}
bytesToOutput -= bytesThisRow;
}
return sb.toString();
}
public byte[] readFile(File f) throws FileNotFoundException, IOException {
long lengthL = f.length();
if(lengthL > Integer.MAX_VALUE) {
throw new IOException("File too big to read into buffer..");
}
return readNBytes(new FileInputStream(f), (int) lengthL);
}
}
