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Copy pathBase64Coder.java
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159 lines (143 loc) · 3.95 KB
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package pl.smsapi.message;
class Base64Coder {
private static final String systemLineSeparator = System.getProperty("line.separator");
private static final char[] map1 = new char[64];
static {
int i = 0;
for (char c = 'A'; c <= 'Z'; c++) {
map1[i++] = c;
}
for (char c = 'a'; c <= 'z'; c++) {
map1[i++] = c;
}
for (char c = '0'; c <= '9'; c++) {
map1[i++] = c;
}
map1[i++] = '+';
map1[i++] = '/';
}
private static final byte[] map2 = new byte[128];
static {
for (int i = 0; i < map2.length; i++) {
map2[i] = -1;
}
for (int i = 0; i < 64; i++) {
map2[map1[i]] = (byte) i;
}
}
public static String encodeString(String s) {
return new String(encode(s.getBytes()));
}
public static String encodeLines(byte[] in) {
return encodeLines(in, 0, in.length, 76, systemLineSeparator);
}
public static String encodeLines(byte[] in, int iOff, int iLen, int lineLen, String lineSeparator) {
int blockLen = (lineLen * 3) / 4;
if (blockLen <= 0) {
throw new IllegalArgumentException();
}
int lines = (iLen + blockLen - 1) / blockLen;
int bufLen = ((iLen + 2) / 3) * 4 + lines * lineSeparator.length();
StringBuilder buf = new StringBuilder(bufLen);
int ip = 0;
while (ip < iLen) {
int l = Math.min(iLen - ip, blockLen);
buf.append(encode(in, iOff + ip, l));
buf.append(lineSeparator);
ip += l;
}
return buf.toString();
}
public static char[] encode(byte[] in) {
return encode(in, 0, in.length);
}
public static char[] encode(byte[] in, int iLen) {
return encode(in, 0, iLen);
}
public static char[] encode(byte[] in, int iOff, int iLen) {
int oDataLen = (iLen * 4 + 2) / 3; // output length without padding
int oLen = ((iLen + 2) / 3) * 4; // output length including padding
char[] out = new char[oLen];
int ip = iOff;
int iEnd = iOff + iLen;
int op = 0;
while (ip < iEnd) {
int i0 = in[ip++] & 0xff;
int i1 = ip < iEnd ? in[ip++] & 0xff : 0;
int i2 = ip < iEnd ? in[ip++] & 0xff : 0;
int o0 = i0 >>> 2;
int o1 = ((i0 & 3) << 4) | (i1 >>> 4);
int o2 = ((i1 & 0xf) << 2) | (i2 >>> 6);
int o3 = i2 & 0x3F;
out[op++] = map1[o0];
out[op++] = map1[o1];
out[op] = op < oDataLen ? map1[o2] : '=';
op++;
out[op] = op < oDataLen ? map1[o3] : '=';
op++;
}
return out;
}
public static String decodeString(String s) {
return new String(decode(s));
}
public static byte[] decodeLines(String s) {
char[] buf = new char[s.length()];
int p = 0;
for (int ip = 0; ip < s.length(); ip++) {
char c = s.charAt(ip);
if (c != ' ' && c != '\r' && c != '\n' && c != '\t') {
buf[p++] = c;
}
}
return decode(buf, 0, p);
}
public static byte[] decode(String s) {
return decode(s.toCharArray());
}
public static byte[] decode(char[] in) {
return decode(in, 0, in.length);
}
public static byte[] decode(char[] in, int iOff, int iLen) {
if (iLen % 4 != 0) {
throw new IllegalArgumentException("Length of Base64 encoded input string is not a multiple of 4.");
}
while (iLen > 0 && in[iOff + iLen - 1] == '=') {
iLen--;
}
int oLen = (iLen * 3) / 4;
byte[] out = new byte[oLen];
int ip = iOff;
int iEnd = iOff + iLen;
int op = 0;
while (ip < iEnd) {
int i0 = in[ip++];
int i1 = in[ip++];
int i2 = ip < iEnd ? in[ip++] : 'A';
int i3 = ip < iEnd ? in[ip++] : 'A';
if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127) {
throw new IllegalArgumentException("Illegal character in Base64 encoded data.");
}
int b0 = map2[i0];
int b1 = map2[i1];
int b2 = map2[i2];
int b3 = map2[i3];
if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0) {
throw new IllegalArgumentException("Illegal character in Base64 encoded data.");
}
int o0 = (b0 << 2) | (b1 >>> 4);
int o1 = ((b1 & 0xf) << 4) | (b2 >>> 2);
int o2 = ((b2 & 3) << 6) | b3;
out[op++] = (byte) o0;
if (op < oLen) {
out[op++] = (byte) o1;
}
if (op < oLen) {
out[op++] = (byte) o2;
}
}
return out;
}
private Base64Coder() {
}
}