/**
* @param bindex Relative index within base64 character unit; between 0 and 3 (as unit has exactly
* 4 characters)
*/
protected IllegalArgumentException reportInvalidBase64Char(
Base64Variant b64variant, int ch, int bindex, String msg) throws IllegalArgumentException {
String base;
if (ch <= INT_SPACE) {
base =
"Illegal white space character (code 0x"
+ Integer.toHexString(ch)
+ ") as character #"
+ (bindex + 1)
+ " of 4-char base64 unit: can only used between units";
} else if (b64variant.usesPaddingChar(ch)) {
base =
"Unexpected padding character ('"
+ b64variant.getPaddingChar()
+ "') as character #"
+ (bindex + 1)
+ " of 4-char base64 unit: padding only legal as 3rd or 4th character";
} else if (!Character.isDefined(ch) || Character.isISOControl(ch)) {
// Not sure if we can really get here... ? (most illegal xml chars are caught at lower level)
base = "Illegal character (code 0x" + Integer.toHexString(ch) + ") in base64 content";
} else {
base =
"Illegal character '"
+ ((char) ch)
+ "' (code 0x"
+ Integer.toHexString(ch)
+ ") in base64 content";
}
if (msg != null) {
base = base + ": " + msg;
}
return new IllegalArgumentException(base);
}
protected final int _decodeBase64Escape(Base64Variant b64variant, char ch, int index)
throws IOException, JsonParseException {
// 17-May-2011, tatu: As per [JACKSON-xxx], need to handle escaped chars
if (ch != '\\') {
throw reportInvalidBase64Char(b64variant, ch, index);
}
char unescaped = _decodeEscaped();
// if white space, skip if first triplet; otherwise errors
if (unescaped <= INT_SPACE) {
if (index == 0) { // whitespace only allowed to be skipped between triplets
return -1;
}
}
// otherwise try to find actual triplet value
int bits = b64variant.decodeBase64Char(unescaped);
if (bits < 0) {
throw reportInvalidBase64Char(b64variant, unescaped, index);
}
return bits;
}