338 lines
8.4 KiB
Java
338 lines
8.4 KiB
Java
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package org.bouncycastle.util;
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/**
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* Utility methods for converting byte arrays into ints and longs, and back again.
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*/
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public abstract class Pack
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{
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public static short bigEndianToShort(byte[] bs, int off)
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{
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int n = (bs[off] & 0xff) << 8;
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n |= (bs[++off] & 0xff);
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return (short)n;
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}
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public static int bigEndianToInt(byte[] bs, int off)
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{
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int n = bs[off] << 24;
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n |= (bs[++off] & 0xff) << 16;
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n |= (bs[++off] & 0xff) << 8;
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n |= (bs[++off] & 0xff);
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return n;
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}
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public static void bigEndianToInt(byte[] bs, int off, int[] ns)
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{
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for (int i = 0; i < ns.length; ++i)
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{
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ns[i] = bigEndianToInt(bs, off);
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off += 4;
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}
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}
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public static void bigEndianToInt(byte[] bs, int off, int[] ns, int nsOff, int nsLen)
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{
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for (int i = 0; i < nsLen; ++i)
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{
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ns[nsOff + i] = bigEndianToInt(bs, off);
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off += 4;
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}
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}
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public static byte[] intToBigEndian(int n)
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{
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byte[] bs = new byte[4];
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intToBigEndian(n, bs, 0);
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return bs;
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}
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public static void intToBigEndian(int n, byte[] bs, int off)
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{
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bs[off] = (byte)(n >>> 24);
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bs[++off] = (byte)(n >>> 16);
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bs[++off] = (byte)(n >>> 8);
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bs[++off] = (byte)(n);
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}
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public static byte[] intToBigEndian(int[] ns)
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{
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byte[] bs = new byte[4 * ns.length];
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intToBigEndian(ns, bs, 0);
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return bs;
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}
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public static void intToBigEndian(int[] ns, byte[] bs, int off)
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{
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for (int i = 0; i < ns.length; ++i)
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{
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intToBigEndian(ns[i], bs, off);
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off += 4;
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}
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}
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public static void intToBigEndian(int[] ns, int nsOff, int nsLen, byte[] bs, int bsOff)
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{
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for (int i = 0; i < nsLen; ++i)
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{
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intToBigEndian(ns[nsOff + i], bs, bsOff);
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bsOff += 4;
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}
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}
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public static long bigEndianToLong(byte[] bs, int off)
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{
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int hi = bigEndianToInt(bs, off);
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int lo = bigEndianToInt(bs, off + 4);
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return ((long)(hi & 0xffffffffL) << 32) | (long)(lo & 0xffffffffL);
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}
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public static void bigEndianToLong(byte[] bs, int off, long[] ns)
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{
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for (int i = 0; i < ns.length; ++i)
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{
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ns[i] = bigEndianToLong(bs, off);
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off += 8;
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}
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}
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public static void bigEndianToLong(byte[] bs, int bsOff, long[] ns, int nsOff, int nsLen)
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{
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for (int i = 0; i < nsLen; ++i)
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{
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ns[nsOff + i] = bigEndianToLong(bs, bsOff);
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bsOff += 8;
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}
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}
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public static byte[] longToBigEndian(long n)
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{
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byte[] bs = new byte[8];
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longToBigEndian(n, bs, 0);
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return bs;
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}
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public static void longToBigEndian(long n, byte[] bs, int off)
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{
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intToBigEndian((int)(n >>> 32), bs, off);
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intToBigEndian((int)(n & 0xffffffffL), bs, off + 4);
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}
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public static byte[] longToBigEndian(long[] ns)
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{
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byte[] bs = new byte[8 * ns.length];
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longToBigEndian(ns, bs, 0);
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return bs;
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}
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public static void longToBigEndian(long[] ns, byte[] bs, int off)
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{
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for (int i = 0; i < ns.length; ++i)
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{
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longToBigEndian(ns[i], bs, off);
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off += 8;
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}
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}
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public static void longToBigEndian(long[] ns, int nsOff, int nsLen, byte[] bs, int bsOff)
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{
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for (int i = 0; i < nsLen; ++i)
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{
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longToBigEndian(ns[nsOff + i], bs, bsOff);
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bsOff += 8;
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}
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}
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/**
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* @param value The number
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* @param bs The target.
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* @param off Position in target to start.
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* @param bytes number of bytes to write.
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*
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* @deprecated Will be removed
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*/
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public static void longToBigEndian(long value, byte[] bs, int off, int bytes)
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{
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for (int i = bytes - 1; i >= 0; i--)
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{
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bs[i + off] = (byte)(value & 0xff);
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value >>>= 8;
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}
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}
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public static short littleEndianToShort(byte[] bs, int off)
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{
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int n = bs[off] & 0xff;
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n |= (bs[++off] & 0xff) << 8;
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return (short)n;
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}
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public static int littleEndianToInt(byte[] bs, int off)
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{
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int n = bs[off] & 0xff;
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n |= (bs[++off] & 0xff) << 8;
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n |= (bs[++off] & 0xff) << 16;
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n |= bs[++off] << 24;
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return n;
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}
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public static void littleEndianToInt(byte[] bs, int off, int[] ns)
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{
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for (int i = 0; i < ns.length; ++i)
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{
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ns[i] = littleEndianToInt(bs, off);
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off += 4;
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}
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}
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public static void littleEndianToInt(byte[] bs, int bOff, int[] ns, int nOff, int count)
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{
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for (int i = 0; i < count; ++i)
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{
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ns[nOff + i] = littleEndianToInt(bs, bOff);
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bOff += 4;
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}
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}
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public static int[] littleEndianToInt(byte[] bs, int off, int count)
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{
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int[] ns = new int[count];
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for (int i = 0; i < ns.length; ++i)
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{
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ns[i] = littleEndianToInt(bs, off);
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off += 4;
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}
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return ns;
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}
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public static byte[] shortToLittleEndian(short n)
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{
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byte[] bs = new byte[2];
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shortToLittleEndian(n, bs, 0);
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return bs;
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}
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public static void shortToLittleEndian(short n, byte[] bs, int off)
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{
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bs[off] = (byte)(n);
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bs[++off] = (byte)(n >>> 8);
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}
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public static byte[] shortToBigEndian(short n)
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{
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byte[] r = new byte[2];
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shortToBigEndian(n, r, 0);
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return r;
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}
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public static void shortToBigEndian(short n, byte[] bs, int off)
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{
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bs[off] = (byte)(n >>> 8);
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bs[++off] = (byte)(n);
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}
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public static byte[] intToLittleEndian(int n)
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{
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byte[] bs = new byte[4];
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intToLittleEndian(n, bs, 0);
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return bs;
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}
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public static void intToLittleEndian(int n, byte[] bs, int off)
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{
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bs[off] = (byte)(n);
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bs[++off] = (byte)(n >>> 8);
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bs[++off] = (byte)(n >>> 16);
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bs[++off] = (byte)(n >>> 24);
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}
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public static byte[] intToLittleEndian(int[] ns)
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{
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byte[] bs = new byte[4 * ns.length];
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intToLittleEndian(ns, bs, 0);
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return bs;
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}
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public static void intToLittleEndian(int[] ns, byte[] bs, int off)
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{
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for (int i = 0; i < ns.length; ++i)
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{
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intToLittleEndian(ns[i], bs, off);
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off += 4;
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}
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}
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public static void intToLittleEndian(int[] ns, int nsOff, int nsLen, byte[] bs, int bsOff)
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{
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for (int i = 0; i < nsLen; ++i)
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{
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intToLittleEndian(ns[nsOff + i], bs, bsOff);
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bsOff += 4;
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}
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}
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public static long littleEndianToLong(byte[] bs, int off)
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{
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int lo = littleEndianToInt(bs, off);
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int hi = littleEndianToInt(bs, off + 4);
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return ((long)(hi & 0xffffffffL) << 32) | (long)(lo & 0xffffffffL);
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}
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public static void littleEndianToLong(byte[] bs, int off, long[] ns)
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{
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for (int i = 0; i < ns.length; ++i)
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{
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ns[i] = littleEndianToLong(bs, off);
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off += 8;
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}
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}
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public static void littleEndianToLong(byte[] bs, int bsOff, long[] ns, int nsOff, int nsLen)
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{
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for (int i = 0; i < nsLen; ++i)
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{
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ns[nsOff + i] = littleEndianToLong(bs, bsOff);
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bsOff += 8;
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}
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}
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public static byte[] longToLittleEndian(long n)
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{
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byte[] bs = new byte[8];
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longToLittleEndian(n, bs, 0);
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return bs;
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}
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public static void longToLittleEndian(long n, byte[] bs, int off)
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{
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intToLittleEndian((int)(n & 0xffffffffL), bs, off);
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intToLittleEndian((int)(n >>> 32), bs, off + 4);
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}
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public static byte[] longToLittleEndian(long[] ns)
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{
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byte[] bs = new byte[8 * ns.length];
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longToLittleEndian(ns, bs, 0);
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return bs;
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}
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public static void longToLittleEndian(long[] ns, byte[] bs, int off)
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{
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for (int i = 0; i < ns.length; ++i)
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{
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longToLittleEndian(ns[i], bs, off);
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off += 8;
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}
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}
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public static void longToLittleEndian(long[] ns, int nsOff, int nsLen, byte[] bs, int bsOff)
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{
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for (int i = 0; i < nsLen; ++i)
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{
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longToLittleEndian(ns[nsOff + i], bs, bsOff);
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bsOff += 8;
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}
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}
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}
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