FileDocCategorySizeDatePackage
Base64.javaAPI DocApache Axis 1.410157Sat Apr 22 18:57:28 BST 2006org.apache.axis.encoding

Base64

public class Base64 extends Object
author
TAMURA Kent <kent@trl.ibm.co.jp>

Fields Summary
private static final char[]
S_BASE64CHAR
private static final char
S_BASE64PAD
private static final byte[]
S_DECODETABLE
Constructors Summary
Methods Summary
public static byte[]decode(char[] data, int off, int len)

        char[] ibuf = new char[4];
        int ibufcount = 0;
        byte[] obuf = new byte[len/4*3+3];
        int obufcount = 0;
        for (int i = off;  i < off+len;  i ++) {
            char ch = data[i];
            if (ch == S_BASE64PAD
                || ch < S_DECODETABLE.length && S_DECODETABLE[ch] != Byte.MAX_VALUE) {
                ibuf[ibufcount++] = ch;
                if (ibufcount == ibuf.length) {
                    ibufcount = 0;
                    obufcount += decode0(ibuf, obuf, obufcount);
                }
            }
        }
        if (obufcount == obuf.length)
            return obuf;
        byte[] ret = new byte[obufcount];
        System.arraycopy(obuf, 0, ret, 0, obufcount);
        return ret;
public static byte[]decode(java.lang.String data)

        char[] ibuf = new char[4];
        int ibufcount = 0;
        byte[] obuf = new byte[data.length()/4*3+3];
        int obufcount = 0;
        for (int i = 0;  i < data.length();  i ++) {
            char ch = data.charAt(i);
            if (ch == S_BASE64PAD
                || ch < S_DECODETABLE.length && S_DECODETABLE[ch] != Byte.MAX_VALUE) {
                ibuf[ibufcount++] = ch;
                if (ibufcount == ibuf.length) {
                    ibufcount = 0;
                    obufcount += decode0(ibuf, obuf, obufcount);
                }
            }
        }
        if (obufcount == obuf.length)
            return obuf;
        byte[] ret = new byte[obufcount];
        System.arraycopy(obuf, 0, ret, 0, obufcount);
        return ret;
public static voiddecode(char[] data, int off, int len, java.io.OutputStream ostream)

        char[] ibuf = new char[4];
        int ibufcount = 0;
        byte[] obuf = new byte[3];
        for (int i = off;  i < off+len;  i ++) {
            char ch = data[i];
            if (ch == S_BASE64PAD
                || ch < S_DECODETABLE.length && S_DECODETABLE[ch] != Byte.MAX_VALUE) {
                ibuf[ibufcount++] = ch;
                if (ibufcount == ibuf.length) {
                    ibufcount = 0;
                    int obufcount = decode0(ibuf, obuf, 0);
                    ostream.write(obuf, 0, obufcount);
                }
            }
        }
public static voiddecode(java.lang.String data, java.io.OutputStream ostream)

        char[] ibuf = new char[4];
        int ibufcount = 0;
        byte[] obuf = new byte[3];
        for (int i = 0;  i < data.length();  i ++) {
            char ch = data.charAt(i);
            if (ch == S_BASE64PAD
                || ch < S_DECODETABLE.length && S_DECODETABLE[ch] != Byte.MAX_VALUE) {
                ibuf[ibufcount++] = ch;
                if (ibufcount == ibuf.length) {
                    ibufcount = 0;
                    int obufcount = decode0(ibuf, obuf, 0);
                    ostream.write(obuf, 0, obufcount);
                }
            }
        }
private static intdecode0(char[] ibuf, byte[] obuf, int wp)

     
        for (int i = 0;  i < S_DECODETABLE.length;  i ++)
            S_DECODETABLE[i] = Byte.MAX_VALUE;  // 127
        for (int i = 0;  i < S_BASE64CHAR.length;  i ++) // 0 to 63
            S_DECODETABLE[S_BASE64CHAR[i]] = (byte)i;
    
        int outlen = 3;
        if (ibuf[3] == S_BASE64PAD)  outlen = 2;
        if (ibuf[2] == S_BASE64PAD)  outlen = 1;
        int b0 = S_DECODETABLE[ibuf[0]];
        int b1 = S_DECODETABLE[ibuf[1]];
        int b2 = S_DECODETABLE[ibuf[2]];
        int b3 = S_DECODETABLE[ibuf[3]];
        switch (outlen) {
        case 1:
            obuf[wp] = (byte)(b0 << 2 & 0xfc | b1 >> 4 & 0x3);
            return 1;
        case 2:
            obuf[wp++] = (byte)(b0 << 2 & 0xfc | b1 >> 4 & 0x3);
            obuf[wp] = (byte)(b1 << 4 & 0xf0 | b2 >> 2 & 0xf);
            return 2;
        case 3:
            obuf[wp++] = (byte)(b0 << 2 & 0xfc | b1 >> 4 & 0x3);
            obuf[wp++] = (byte)(b1 << 4 & 0xf0 | b2 >> 2 & 0xf);
            obuf[wp] = (byte)(b2 << 6 & 0xc0 | b3 & 0x3f);
            return 3;
        default:
            throw new RuntimeException(Messages.getMessage("internalError00"));
        }
public static java.lang.Stringencode(byte[] data)
Returns base64 representation of specified byte array.

        return encode(data, 0, data.length);
public static java.lang.Stringencode(byte[] data, int off, int len)
Returns base64 representation of specified byte array.

        if (len <= 0)  return "";
        char[] out = new char[len/3*4+4];
        int rindex = off;
        int windex = 0;
        int rest = len-off;
        while (rest >= 3) {
            int i = ((data[rindex]&0xff)<<16)
                    +((data[rindex+1]&0xff)<<8)
                    +(data[rindex+2]&0xff);
            out[windex++] = S_BASE64CHAR[i>>18];
            out[windex++] = S_BASE64CHAR[(i>>12)&0x3f];
            out[windex++] = S_BASE64CHAR[(i>>6)&0x3f];
            out[windex++] = S_BASE64CHAR[i&0x3f];
            rindex += 3;
            rest -= 3;
        }
        if (rest == 1) {
            int i = data[rindex]&0xff;
            out[windex++] = S_BASE64CHAR[i>>2];
            out[windex++] = S_BASE64CHAR[(i<<4)&0x3f];
            out[windex++] = S_BASE64PAD;
            out[windex++] = S_BASE64PAD;
        } else if (rest == 2) {
            int i = ((data[rindex]&0xff)<<8)+(data[rindex+1]&0xff);
            out[windex++] = S_BASE64CHAR[i>>10];
            out[windex++] = S_BASE64CHAR[(i>>4)&0x3f];
            out[windex++] = S_BASE64CHAR[(i<<2)&0x3f];
            out[windex++] = S_BASE64PAD;
        }
        return new String(out, 0, windex);
public static voidencode(byte[] data, int off, int len, java.io.OutputStream ostream)
Outputs base64 representation of the specified byte array to a byte stream.

        if (len <= 0)  return;
        byte[] out = new byte[4];
        int rindex = off;
        int rest = len-off;
        while (rest >= 3) {
            int i = ((data[rindex]&0xff)<<16)
                    +((data[rindex+1]&0xff)<<8)
                    +(data[rindex+2]&0xff);
            out[0] = (byte)S_BASE64CHAR[i>>18];
            out[1] = (byte)S_BASE64CHAR[(i>>12)&0x3f];
            out[2] = (byte)S_BASE64CHAR[(i>>6)&0x3f];
            out[3] = (byte)S_BASE64CHAR[i&0x3f];
            ostream.write(out, 0, 4);
            rindex += 3;
            rest -= 3;
        }
        if (rest == 1) {
            int i = data[rindex]&0xff;
            out[0] = (byte)S_BASE64CHAR[i>>2];
            out[1] = (byte)S_BASE64CHAR[(i<<4)&0x3f];
            out[2] = (byte)S_BASE64PAD;
            out[3] = (byte)S_BASE64PAD;
            ostream.write(out, 0, 4);
        } else if (rest == 2) {
            int i = ((data[rindex]&0xff)<<8)+(data[rindex+1]&0xff);
            out[0] = (byte)S_BASE64CHAR[i>>10];
            out[1] = (byte)S_BASE64CHAR[(i>>4)&0x3f];
            out[2] = (byte)S_BASE64CHAR[(i<<2)&0x3f];
            out[3] = (byte)S_BASE64PAD;
            ostream.write(out, 0, 4);
        }
public static voidencode(byte[] data, int off, int len, java.io.Writer writer)
Outputs base64 representation of the specified byte array to a character stream.

        if (len <= 0)  return;
        char[] out = new char[4];
        int rindex = off;
        int rest = len-off;
        int output = 0;
        while (rest >= 3) {
            int i = ((data[rindex]&0xff)<<16)
                    +((data[rindex+1]&0xff)<<8)
                    +(data[rindex+2]&0xff);
            out[0] = S_BASE64CHAR[i>>18];
            out[1] = S_BASE64CHAR[(i>>12)&0x3f];
            out[2] = S_BASE64CHAR[(i>>6)&0x3f];
            out[3] = S_BASE64CHAR[i&0x3f];
            writer.write(out, 0, 4);
            rindex += 3;
            rest -= 3;
            output += 4;
            if (output % 76 == 0)
                writer.write("\n");
        }
        if (rest == 1) {
            int i = data[rindex]&0xff;
            out[0] = S_BASE64CHAR[i>>2];
            out[1] = S_BASE64CHAR[(i<<4)&0x3f];
            out[2] = S_BASE64PAD;
            out[3] = S_BASE64PAD;
            writer.write(out, 0, 4);
        } else if (rest == 2) {
            int i = ((data[rindex]&0xff)<<8)+(data[rindex+1]&0xff);
            out[0] = S_BASE64CHAR[i>>10];
            out[1] = S_BASE64CHAR[(i>>4)&0x3f];
            out[2] = S_BASE64CHAR[(i<<2)&0x3f];
            out[3] = S_BASE64PAD;
            writer.write(out, 0, 4);
        }