private static boolean encodeUnescaped(char c, boolean fullUri) {
if (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') || ('0' <= c && c <= '9')) {
return true;
}
if ("-_.!~*'()".indexOf(c) >= 0) return true;
if (fullUri) {
return URI_DECODE_RESERVED.indexOf(c) >= 0;
}
return false;
}
public static String decodeURI(String str, boolean fullUri) throws URISyntaxException {
char[] buf = null;
int bufTop = 0;
for (int k = 0, length = str.length(); k != length; ) {
char C = str.charAt(k);
if (C != '%') {
if (buf != null) {
buf[bufTop++] = C;
}
++k;
} else {
if (buf == null) {
// decode always compress so result can not be bigger then
// str.length()
buf = new char[length];
str.getChars(0, k, buf, 0);
bufTop = k;
}
int start = k;
if (k + 3 > length) {
throw new URISyntaxException(str, "Illegal URI format");
}
int B = unHex(str.charAt(k + 1), str.charAt(k + 2));
if (B < 0) {
throw new URISyntaxException(str, "Illegal URI format");
}
k += 3;
if ((B & 0x80) == 0) {
C = (char) B;
} else {
// Decode UTF-8 sequence into ucs4Char and encode it into
// UTF-16
int utf8Tail, ucs4Char, minUcs4Char;
if ((B & 0xC0) == 0x80) {
// First UTF-8 should be ouside 0x80..0xBF
throw new URISyntaxException(str, "Illegal URI format");
} else if ((B & 0x20) == 0) {
utf8Tail = 1;
ucs4Char = B & 0x1F;
minUcs4Char = 0x80;
} else if ((B & 0x10) == 0) {
utf8Tail = 2;
ucs4Char = B & 0x0F;
minUcs4Char = 0x800;
} else if ((B & 0x08) == 0) {
utf8Tail = 3;
ucs4Char = B & 0x07;
minUcs4Char = 0x10000;
} else if ((B & 0x04) == 0) {
utf8Tail = 4;
ucs4Char = B & 0x03;
minUcs4Char = 0x200000;
} else if ((B & 0x02) == 0) {
utf8Tail = 5;
ucs4Char = B & 0x01;
minUcs4Char = 0x4000000;
} else {
// First UTF-8 can not be 0xFF or 0xFE
throw new URISyntaxException(str, "Illegal URI format");
}
if (k + 3 * utf8Tail > length) {
throw new URISyntaxException(str, "Illegal URI format");
}
for (int j = 0; j != utf8Tail; j++) {
if (str.charAt(k) != '%') {
throw new URISyntaxException(str, "Illegal URI format");
}
B = unHex(str.charAt(k + 1), str.charAt(k + 2));
if (B < 0 || (B & 0xC0) != 0x80) {
throw new URISyntaxException(str, "Illegal URI format");
}
ucs4Char = (ucs4Char << 6) | (B & 0x3F);
k += 3;
}
// Check for overlongs and other should-not-present codes
if (ucs4Char < minUcs4Char || ucs4Char == 0xFFFE || ucs4Char == 0xFFFF) {
ucs4Char = 0xFFFD;
}
if (ucs4Char >= 0x10000) {
ucs4Char -= 0x10000;
if (ucs4Char > 0xFFFFF) {
throw new URISyntaxException(str, "Illegal URI format");
}
char H = (char) ((ucs4Char >>> 10) + 0xD800);
C = (char) ((ucs4Char & 0x3FF) + 0xDC00);
buf[bufTop++] = H;
} else {
C = (char) ucs4Char;
}
}
if (fullUri && URI_DECODE_RESERVED.indexOf(C) >= 0) {
for (int x = start; x != k; x++) {
buf[bufTop++] = str.charAt(x);
}
} else {
buf[bufTop++] = C;
}
}
}
return (buf == null) ? str : new String(buf, 0, bufTop);
}
