package com.ximple.eofms.util;
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//~--- JDK imports ------------------------------------------------------------
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.nio.LongBuffer;
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/**
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* BinConverter
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* User: Ulysses
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* Date: 2007/9/17
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* Time: 上午 01:13:13
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*/
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public class BinConverter
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{
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// our table for binhex conversion
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final static char[] HEXTAB =
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{
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
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};
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/**
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* gets bytes from an array into a long
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*
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* @param buffer where to get the bytes
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* @param nStartIndex index from where to read the data
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* @return the 64bit integer
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*/
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public static long byteArrayToLong(byte[] buffer, int nStartIndex)
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{
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return (((long) buffer[nStartIndex]) << 56) | (((long) buffer[nStartIndex + 1] & 0x0ffL) << 48)
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| (((long) buffer[nStartIndex + 2] & 0x0ffL) << 40) | (((long) buffer[nStartIndex + 3] & 0x0ffL) << 32)
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| (((long) buffer[nStartIndex + 4] & 0x0ffL) << 24) | (((long) buffer[nStartIndex + 5] & 0x0ffL) << 16)
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| (((long) buffer[nStartIndex + 6] & 0x0ffL) << 8) | ((long) buffer[nStartIndex + 7] & 0x0ff);
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}
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/**
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* converts a long o bytes which are put into a given array
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*
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* @param lValue the 64bit integer to convert
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* @param buffer the target buffer
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* @param nStartIndex where to place the bytes in the buffer
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*/
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public static void longToByteArray(long lValue, byte[] buffer, int nStartIndex)
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{
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buffer[nStartIndex] = (byte) (lValue >>> 56);
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buffer[nStartIndex + 1] = (byte) ((lValue >>> 48) & 0x0ff);
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buffer[nStartIndex + 2] = (byte) ((lValue >>> 40) & 0x0ff);
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buffer[nStartIndex + 3] = (byte) ((lValue >>> 32) & 0x0ff);
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buffer[nStartIndex + 4] = (byte) ((lValue >>> 24) & 0x0ff);
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buffer[nStartIndex + 5] = (byte) ((lValue >>> 16) & 0x0ff);
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buffer[nStartIndex + 6] = (byte) ((lValue >>> 8) & 0x0ff);
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buffer[nStartIndex + 7] = (byte) lValue;
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}
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/**
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* converts values from an integer array to a long
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*
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* @param buffer where to get the bytes
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* @param nStartIndex index from where to read the data
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* @return the 64bit integer
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*/
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public static long intArrayToLong(int[] buffer, int nStartIndex)
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{
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return (((long) buffer[nStartIndex]) << 32) | (((long) buffer[nStartIndex + 1]) & 0x0ffffffffL);
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}
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/**
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* converts a long to integers which are put into a given array
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*
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* @param lValue the 64bit integer to convert
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* @param buffer the target buffer
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* @param nStartIndex where to place the bytes in the buffer
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*/
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public static void longToIntArray(long lValue, int[] buffer, int nStartIndex)
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{
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buffer[nStartIndex] = (int) (lValue >>> 32);
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buffer[nStartIndex + 1] = (int) lValue;
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}
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/**
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* makes a long from two integers (treated unsigned)
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*
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* @param nLo lower 32bits
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* @param nHi higher 32bits
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* @return the built long
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*/
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public static long makeLong(int nLo, int nHi)
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{
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return (((long) nHi << 32) | ((long) nLo & 0x00000000ffffffffL));
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}
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/**
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* gets the lower 32 bits of a long
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*
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* @param lVal the long integer
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* @return lower 32 bits
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*/
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public static int longLo32(long lVal)
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{
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return (int) lVal;
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}
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/**
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* gets the higher 32 bits of a long
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*
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* @param lVal the long integer
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* @return higher 32 bits
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*/
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public static int longHi32(long lVal)
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{
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return (int) ((long) (lVal >>> 32));
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}
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/**
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* converts a byte array to a binhex string
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*
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* @param data the byte array
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* @return the binhex string
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*/
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public static String bytesToBinHex(byte[] data)
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{
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// just map the call
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return bytesToBinHex(data, 0, data.length);
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}
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/**
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* converts a byte array to a binhex string
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*
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* @param data the byte array
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* @param nStartPos start index where to get the bytes
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* @param nNumOfBytes number of bytes to convert
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* @return the binhex string
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*/
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public static String bytesToBinHex(byte[] data, int nStartPos, int nNumOfBytes)
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{
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StringBuffer sbuf = new StringBuffer();
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sbuf.setLength(nNumOfBytes << 1);
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int nPos = 0;
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for (int nI = 0; nI < nNumOfBytes; nI++)
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{
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sbuf.setCharAt(nPos++, HEXTAB[(data[nI + nStartPos] >> 4) & 0x0f]);
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sbuf.setCharAt(nPos++, HEXTAB[data[nI + nStartPos] & 0x0f]);
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}
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return sbuf.toString();
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}
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/**
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* converts a binhex string back into a byte array (invalid codes will be skipped)
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*
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* @param sBinHex binhex string
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* @param data the target array
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* @param nSrcPos from which character in the string the conversion should begin,
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* remember that (nSrcPos modulo 2) should equals 0 normally
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* @param nDstPos to store the bytes from which position in the array
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* @param nNumOfBytes number of bytes to extract
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* @return number of extracted bytes
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*/
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public static int binHexToBytes(String sBinHex, byte[] data, int nSrcPos, int nDstPos, int nNumOfBytes)
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{
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// check for correct ranges
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int nStrLen = sBinHex.length();
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int nAvailBytes = (nStrLen - nSrcPos) >> 1;
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if (nAvailBytes < nNumOfBytes)
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{
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nNumOfBytes = nAvailBytes;
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}
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int nOutputCapacity = data.length - nDstPos;
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if (nNumOfBytes > nOutputCapacity)
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{
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nNumOfBytes = nOutputCapacity;
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}
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// convert now
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int nResult = 0;
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for (int nI = 0; nI < nNumOfBytes; nI++)
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{
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byte bActByte = 0;
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boolean blConvertOK = true;
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for (int nJ = 0; nJ < 2; nJ++)
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{
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bActByte <<= 4;
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char cActChar = sBinHex.charAt(nSrcPos++);
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if ((cActChar >= 'a') && (cActChar <= 'f'))
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{
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bActByte |= (byte) (cActChar - 'a') + 10;
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} else if ((cActChar >= '0') && (cActChar <= '9'))
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{
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bActByte |= (byte) (cActChar - '0');
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} else
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{
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blConvertOK = false;
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}
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}
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if (blConvertOK)
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{
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data[nDstPos++] = bActByte;
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nResult++;
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}
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}
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return nResult;
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}
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/**
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* converts a byte array into an UNICODE string
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*
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* @param data the byte array
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* @param nStartPos where to begin the conversion
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* @param nNumOfBytes number of bytes to handle
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* @return the string
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*/
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public static String byteArrayToUNCString(byte[] data, int nStartPos, int nNumOfBytes)
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{
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// we need two bytes for every character
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nNumOfBytes &= ~1;
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// enough bytes in the buffer?
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int nAvailCapacity = data.length - nStartPos;
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if (nAvailCapacity < nNumOfBytes)
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{
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nNumOfBytes = nAvailCapacity;
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}
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StringBuffer sbuf = new StringBuffer();
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sbuf.setLength(nNumOfBytes >> 1);
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int nSBufPos = 0;
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while (nNumOfBytes > 0)
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{
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sbuf.setCharAt(nSBufPos++, (char) (((int) data[nStartPos] << 8) | ((int) data[nStartPos + 1] & 0x0ff)));
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nStartPos += 2;
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nNumOfBytes -= 2;
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}
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return sbuf.toString();
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}
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public static long[] marshalByteArray(byte[] raws, boolean hasSignature)
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{
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int remainder = raws.length % 8;
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ByteBuffer rawData = ByteBuffer.wrap(raws);
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rawData.rewind();
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rawData.order(ByteOrder.LITTLE_ENDIAN);
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LongBuffer longBuffer = ((ByteBuffer) rawData.rewind()).asLongBuffer();
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int resultSize = longBuffer.limit() + ((remainder != 0)
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? 1
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: 0) + (hasSignature
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? 1
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: 0);
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long[] result = new long[resultSize];
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int i = 0;
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if (hasSignature)
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{
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result[i] = raws.length;
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i++;
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}
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while (longBuffer.hasRemaining())
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{
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result[i] = longBuffer.get();
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i++;
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}
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if (remainder != 0)
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{
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int pos = (i - (hasSignature
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? 1
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: 0)) * 8;
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// int pos = rawData.position();
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byte[] temp = new byte[8];
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for (int j = 0; j < remainder; j++)
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{
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temp[7 - j] = raws[pos + j];
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}
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// System.arraycopy(raws, pos, temp, 0, remainder);
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result[i] = BinConverter.byteArrayToLong(temp, 0);
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}
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return result;
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}
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public static byte[] unmarshalByteArray(long[] raws, boolean hasSignature)
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{
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LongBuffer longBuffer = LongBuffer.wrap(raws);
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int resultBufferSize = (raws.length - (hasSignature
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? 1
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: 0)) * 8;
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int resultSize = resultBufferSize;
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if (hasSignature)
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{
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resultSize = (int) longBuffer.get();
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}
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ByteBuffer result = ByteBuffer.allocate(resultBufferSize);
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result.order(ByteOrder.LITTLE_ENDIAN);
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while (longBuffer.hasRemaining())
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{
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result.putLong(longBuffer.get());
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}
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if (resultSize == resultBufferSize)
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{
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return result.array();
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}
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byte[] resultData = new byte[resultSize];
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result.position(0);
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result.get(resultData, 0, resultSize);
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return resultData;
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}
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public static long[] marshalCompactByteArray(byte[] raws)
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{
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byte[] compactRaws = new byte[raws.length + 2];
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ByteBuffer bbCompact = ByteBuffer.wrap(compactRaws);
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bbCompact.order(ByteOrder.LITTLE_ENDIAN);
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bbCompact.putShort((short) raws.length);
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bbCompact.put(raws);
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long[] longData = BinConverter.marshalByteArray(compactRaws, false);
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return longData;
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}
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public static byte[] unmarshalCompactByteArray(long[] raws)
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{
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byte[] rawData = BinConverter.unmarshalByteArray(raws, false);
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ByteBuffer bbCompact = ByteBuffer.wrap(rawData);
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bbCompact.order(ByteOrder.LITTLE_ENDIAN);
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short originSize = bbCompact.getShort();
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byte[] rawOriginData = new byte[originSize];
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bbCompact.get(rawOriginData, 0, originSize);
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return rawOriginData;
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}
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}
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