/**
* Converts a hex encoded value to its binary value
* @param from - buffer containing the input data
* @param len - the size of from
* @param to - the output buffer !!! must have at least len/2 allocated memory
* @returns the written length
*/
int base16_to_bin(char *from, int len, char *to) {
int i, j;
for (i = 0, j = 0; j < len; i++, j += 2) {
to[i] = (unsigned char) (HEX_DIGIT(from[j]) << 4 | HEX_DIGIT(from[j+1]));
}
return i;
}
void
URLParams::DecodeString(const nsACString& aInput, nsAString& aOutput)
{
nsACString::const_iterator start, end;
aInput.BeginReading(start);
aInput.EndReading(end);
nsCString unescaped;
while (start != end) {
// replace '+' with U+0020
if (*start == '+') {
unescaped.Append(' ');
++start;
continue;
}
// Percent decode algorithm
if (*start == '%') {
nsACString::const_iterator first(start);
++first;
nsACString::const_iterator second(first);
++second;
#define ASCII_HEX_DIGIT( x ) \
((x >= 0x41 && x <= 0x46) || \
(x >= 0x61 && x <= 0x66) || \
(x >= 0x30 && x <= 0x39))
#define HEX_DIGIT( x ) \
(*x >= 0x30 && *x <= 0x39 \
? *x - 0x30 \
: (*x >= 0x41 && *x <= 0x46 \
? *x - 0x37 \
: *x - 0x57))
if (first != end && second != end &&
ASCII_HEX_DIGIT(*first) && ASCII_HEX_DIGIT(*second)) {
unescaped.Append(HEX_DIGIT(first) * 16 + HEX_DIGIT(second));
start = ++second;
continue;
} else {
unescaped.Append('%');
++start;
continue;
}
}
unescaped.Append(*start);
++start;
}
ConvertString(unescaped, aOutput);
}
