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Base64.java
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163 lines (150 loc) · 4.88 KB
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package javaforce;
import java.io.*;
public class Base64 {
private static final byte[] etable = {
'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 final byte[] dtable = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0x3e, -1, -1, -1, 0x3f,
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, -1, -1, -1, 0x40, -1, -1,
-1, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, -1, -1, -1, -1, -1,
-1, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
};
/** Encodes raw data into Base64 format.
* @param in = input data
*/
public static final byte[] encode(byte in[]) {
return encode(in, -1);
}
/** Encodes raw data into Base64 format.
* @param in = input data
* @param lineLength = max line length (-1 to ignore) */
public static final byte[] encode(byte in[], int lineLength) {
//convert 3x8bit into 4x6bit
int i3 = in.length / 3;
int i3m = in.length % 3;
byte e1, e2, e3, e4; //elements
ByteArrayOutputStream out = new ByteArrayOutputStream();
if (i3m > 0) {
//append zero bytes
byte in3[] = new byte[in.length + i3m];
System.arraycopy(in, 0, in3, 0, in.length);
in = in3;
}
int inpos = 0;
if (lineLength > 0) {
lineLength &= (0x10000 - 3);
}
for (int a = 0; a < i3; a++) {
e1 = (byte) (((in[inpos] & 0xfc) >>> 2));
e2 = (byte) (((in[inpos + 1] & 0xf0) >>> 4) + ((in[inpos] & 0x03) << 4));
e3 = (byte) (((in[inpos + 1] & 0x0f) << 2) + ((in[inpos + 2] & 0xc0) >>> 6));
e4 = (byte) (in[inpos + 2] & 0x3f);
out.write(etable[e1]);
out.write(etable[e2]);
out.write(etable[e3]);
out.write(etable[e4]);
if ((lineLength > 0) && (a % lineLength == 0) && (a > 0)) {
out.write('\n');
}
inpos += 3;
}
if (i3m > 0) {
//Note : 64 == '='
e1 = (byte) ((in[inpos] & 0xfc) >>> 2);
e2 = (byte) (((in[inpos + 1] & 0xf0) >>> 4) + ((in[inpos] & 0x03) << 4));
if (i3m == 1) {
e3 = 64;
} else {
e3 = (byte) (((in[inpos + 1] & 0x0f) << 2) + ((in[inpos + 2] & 0xc0) >>> 6));
}
e4 = 64;
out.write(etable[e1]);
out.write(etable[e2]);
out.write(etable[e3]);
out.write(etable[e4]);
}
return out.toByteArray();
}
private static final class Buffer {
byte buf[];
int pos;
}
private static final int getbyte(Buffer buffer) {
int ret;
while (true) {
if (buffer.pos == buffer.buf.length) {
return 65;
}
ret = dtable[buffer.buf[buffer.pos++]];
if (ret != -1) {
break;
}
}
return ret;
}
/** Decodes Base64 data into raw data.
* @param in = input data
*/
public static final byte[] decode(byte in[]) {
int e1, e2, e3, e4;
int o32;
Buffer buffer = new Buffer();
buffer.buf = in;
buffer.pos = 0;
ByteArrayOutputStream out = new ByteArrayOutputStream();
while (buffer.pos != buffer.buf.length) {
e1 = getbyte(buffer);
if (e1 == 65) {
break;
}
e2 = getbyte(buffer);
if (e2 == 65) {
break;
}
e3 = getbyte(buffer);
if (e3 == 65) {
break;
}
e4 = getbyte(buffer);
if (e4 == 65) {
break;
}
o32 = e1 << 2;
o32 |= (((e2 & 0x30) >> 4) + ((e2 & 0x0f) << 12));
if (e3 != 64) {
o32 |= (((e3 & 0x3c) << 6) + ((e3 & 0x03) << 22));
}
if (e4 != 64) {
o32 |= (e4 << 16);
}
out.write(o32 & 0xff);
if (e3 != 64) {
out.write((o32 & 0xff00) >> 8);
}
if (e4 != 64) {
out.write((o32 & 0xff0000) >> 16);
}
if (e4 == 64) {
break;
}
}
return out.toByteArray();
}
}