package plan9.lib; // from styx-n-9p.googlecode.com (MIT licence)public class Base64 implements Encoding { public final String enc(byte[] a){ int n = a.length; if(n == 0) return ""; char[] out = new char[4*n/3+4]; int j = 0; for(int i = 0; i < n;) { int x = ((int)a[i++]&255) << 16; if(i < n) x |= ((int)a[i++]&255) << 8; if(i < n) x |= ((int)a[i++]&255); out[j++] = c64(x>>18); out[j++] = c64(x>>12); out[j++] = c64(x>> 6); out[j++] = c64(x); } int nmod3 = n % 3; if(nmod3 != 0) { out[j-1] = '='; if(nmod3 == 1) out[j-2] = '='; } return new String(out, 0, j); } static final char[] cmap = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/'}; private static char c64(int c) { return cmap[c&63]; } private static final short INVAL = 255; private static final short[] t64d = { INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL, INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL, INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL, 62,INVAL,INVAL,INVAL, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL, INVAL, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,INVAL,INVAL,INVAL,INVAL,INVAL, INVAL, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,INVAL,INVAL,INVAL,INVAL,INVAL, INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL, INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL, INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL, INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL, INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL, INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL, INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL, INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL }; public final byte[] dec(String s){ int b24 = 0; int i = 0; int l = s.length(); byte[] out = new byte[(3*l+3)/4]; // upper bound, especially if s contains white space int o = 0; for(int n = 0; n < l; n++){ int c; if((c = s.charAt(n)) > 0xFF || (c = t64d[c]) == INVAL) continue; switch(i++){ case 0: b24 = c<<18; break; case 1: b24 |= c<<12; break; case 2: b24 |= c<<6; break; case 3: b24 |= c; out[o++] = (byte) (b24>>16); out[o++] = (byte) (b24>>8); out[o++] = (byte) b24; i = 0; break; default: // impossible; sop to findbugs break; } } switch(i){ case 2: out[o++] = (byte) (b24>>16); break; case 3: out[o++] = (byte) (b24>>16); out[o++] = (byte) (b24>>8); break; } if(o != out.length){ byte[] trimmed = new byte[o]; System.arraycopy(out, 0, trimmed, 0, o); out = trimmed; } return out; }}
package plan9.lib;
// from styx-n-9p.googlecode.com (MIT licence)
public class Base64 implements Encoding {
public final String enc(byte[] a){
int n = a.length;
if(n == 0)
return "";
char[] out = new char[4*n/3+4];
int j = 0;
for(int i = 0; i < n;) {
int x = ((int)a[i++]&255) << 16;
if(i < n)
x |= ((int)a[i++]&255) << 8;
if(i < n)
x |= ((int)a[i++]&255);
out[j++] = c64(x>>18);
out[j++] = c64(x>>12);
out[j++] = c64(x>> 6);
out[j++] = c64(x);
}
int nmod3 = n % 3;
if(nmod3 != 0) {
out[j-1] = '=';
if(nmod3 == 1)
out[j-2] = '=';
}
return new String(out, 0, j);
}
static final char[] cmap = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/'};
private static char c64(int c)
{
return cmap[c&63];
}
private static final short INVAL = 255;
private static final short[] t64d = {
INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,
INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,
INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL, 62,INVAL,INVAL,INVAL, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,
INVAL, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,INVAL,INVAL,INVAL,INVAL,INVAL,
INVAL, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,INVAL,INVAL,INVAL,INVAL,INVAL,
INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,
INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,
INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,
INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,
INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,
INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,
INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,
INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL,INVAL
};
public final byte[] dec(String s){
int b24 = 0;
int i = 0;
int l = s.length();
byte[] out = new byte[(3*l+3)/4]; // upper bound, especially if s contains white space
int o = 0;
for(int n = 0; n < l; n++){
int c;
if((c = s.charAt(n)) > 0xFF || (c = t64d[c]) == INVAL)
continue;
switch(i++){
case 0:
b24 = c<<18;
break;
case 1:
b24 |= c<<12;
break;
case 2:
b24 |= c<<6;
break;
case 3:
b24 |= c;
out[o++] = (byte) (b24>>16);
out[o++] = (byte) (b24>>8);
out[o++] = (byte) b24;
i = 0;
break;
default:
// impossible; sop to findbugs
break;
}
}
switch(i){
case 2:
out[o++] = (byte) (b24>>16);
break;
case 3:
out[o++] = (byte) (b24>>16);
out[o++] = (byte) (b24>>8);
break;
}
if(o != out.length){
byte[] trimmed = new byte[o];
System.arraycopy(out, 0, trimmed, 0, o);
out = trimmed;
}
return out;
}
}