com.github.antoniomacri.reactivegwt.proxy.Utils Maven / Gradle / Ivy
package com.github.antoniomacri.reactivegwt.proxy;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.nio.charset.StandardCharsets;
public class Utils {
/**
* Copied from com.google.gwt.lang.LongLib
*/
public static long longFromBase64(String value) {
int pos = 0;
long longVal = base64Value(value.charAt(pos++));
int len = value.length();
while (pos < len) {
longVal <<= 6;
longVal |= base64Value(value.charAt(pos++));
}
return longVal;
}
// Assume digit is one of [A-Za-z0-9$_]
private static int base64Value(char digit) {
if (digit >= 'A' && digit <= 'Z') {
return digit - 'A';
}
// No need to check digit <= 'z'
if (digit >= 'a') {
return digit - 'a' + 26;
}
if (digit >= '0' && digit <= '9') {
return digit - '0' + 52;
}
if (digit == '$') {
return 62;
}
// digit == '_'
return 63;
}
/**
* Return an optionally single-quoted string containing a base-64 encoded
* version of the given long value.
*
* Keep this synchronized with the version in Base64Utils.
*/
public static String toBase64(long value) {
// Convert to ints early to avoid need for long ops
int low = (int) (value & 0xffffffff);
int high = (int) (value >> 32);
StringBuilder sb = new StringBuilder();
boolean haveNonZero = base64Append(sb, (high >> 28) & 0xf, false);
haveNonZero = base64Append(sb, (high >> 22) & 0x3f, haveNonZero);
haveNonZero = base64Append(sb, (high >> 16) & 0x3f, haveNonZero);
haveNonZero = base64Append(sb, (high >> 10) & 0x3f, haveNonZero);
haveNonZero = base64Append(sb, (high >> 4) & 0x3f, haveNonZero);
int v = ((high & 0xf) << 2) | ((low >> 30) & 0x3);
haveNonZero = base64Append(sb, v, haveNonZero);
haveNonZero = base64Append(sb, (low >> 24) & 0x3f, haveNonZero);
haveNonZero = base64Append(sb, (low >> 18) & 0x3f, haveNonZero);
haveNonZero = base64Append(sb, (low >> 12) & 0x3f, haveNonZero);
base64Append(sb, (low >> 6) & 0x3f, haveNonZero);
base64Append(sb, low & 0x3f, true);
return sb.toString();
}
private static boolean base64Append(StringBuilder sb, int digit,
boolean haveNonZero) {
if (digit > 0) {
haveNonZero = true;
}
if (haveNonZero) {
int c;
if (digit < 26) {
c = 'A' + digit;
} else if (digit < 52) {
c = 'a' + digit - 26;
} else if (digit < 62) {
c = '0' + digit - 52;
} else if (digit == 62) {
c = '$';
} else {
c = '_';
}
sb.append((char) c);
}
return haveNonZero;
}
public static String getResposeText(HttpURLConnection connection) throws IOException {
InputStream is = connection.getInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len;
while ((len = is.read(buffer)) > 0) {
baos.write(buffer, 0, len);
}
String responseText = baos.toString(StandardCharsets.UTF_8);
return responseText;
}
}