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package org.bouncycastle.crypto.util;
public abstract class Pack
{
public static int bigEndianToInt(byte[] bs, int off)
{
int n = bs[ off] << 24;
n |= (bs[++off] & 0xff) << 16;
n |= (bs[++off] & 0xff) << 8;
n |= (bs[++off] & 0xff);
return n;
}
public static void bigEndianToInt(byte[] bs, int off, int[] ns)
{
for (int i = 0; i < ns.length; ++i)
{
ns[i] = bigEndianToInt(bs, off);
off += 4;
}
}
public static void intToBigEndian(int n, byte[] bs, int off)
{
bs[ off] = (byte)(n >>> 24);
bs[++off] = (byte)(n >>> 16);
bs[++off] = (byte)(n >>> 8);
bs[++off] = (byte)(n );
}
public static void intToBigEndian(int[] ns, byte[] bs, int off)
{
for (int i = 0; i < ns.length; ++i)
{
intToBigEndian(ns[i], bs, off);
off += 4;
}
}
public static long bigEndianToLong(byte[] bs, int off)
{
int hi = bigEndianToInt(bs, off);
int lo = bigEndianToInt(bs, off + 4);
return ((long)(hi & 0xffffffffL) << 32) | (long)(lo & 0xffffffffL);
}
public static void longToBigEndian(long n, byte[] bs, int off)
{
intToBigEndian((int)(n >>> 32), bs, off);
intToBigEndian((int)(n & 0xffffffffL), bs, off + 4);
}
public static int littleEndianToInt(byte[] bs, int off)
{
int n = bs[ off] & 0xff;
n |= (bs[++off] & 0xff) << 8;
n |= (bs[++off] & 0xff) << 16;
n |= bs[++off] << 24;
return n;
}
public static void littleEndianToInt(byte[] bs, int off, int[] ns)
{
for (int i = 0; i < ns.length; ++i)
{
ns[i] = littleEndianToInt(bs, off);
off += 4;
}
}
public static void intToLittleEndian(int n, byte[] bs, int off)
{
bs[ off] = (byte)(n );
bs[++off] = (byte)(n >>> 8);
bs[++off] = (byte)(n >>> 16);
bs[++off] = (byte)(n >>> 24);
}
public static void intToLittleEndian(int[] ns, byte[] bs, int off)
{
for (int i = 0; i < ns.length; ++i)
{
intToLittleEndian(ns[i], bs, off);
off += 4;
}
}
public static long littleEndianToLong(byte[] bs, int off)
{
int lo = littleEndianToInt(bs, off);
int hi = littleEndianToInt(bs, off + 4);
return ((long)(hi & 0xffffffffL) << 32) | (long)(lo & 0xffffffffL);
}
public static void longToLittleEndian(long n, byte[] bs, int off)
{
intToLittleEndian((int)(n & 0xffffffffL), bs, off);
intToLittleEndian((int)(n >>> 32), bs, off + 4);
}
}
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