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function dec2char(n) {
// converts a decimal number to a Unicode character
// n: the dec codepoint value to be converted
if (n <= 0xffff) {
out = String.fromCharCode(n);
} else if (n <= 0x10ffff) {
n -= 0x10000;
out =
String.fromCharCode(0xd800 | (n >> 10)) +
String.fromCharCode(0xdc00 | (n & 0x3ff));
} else out = "dec2char error: Code point out of range: " + n;
return out;
}
function big5Decoder(stream) {
stream = stream.replace(/%/g, " ");
stream = stream.replace(/[\s]+/g, " ").trim();
var bytes = stream.split(" ");
for (var i = 0; i < bytes.length; i++) bytes[i] = parseInt(bytes[i], 16);
var out = "";
var lead, byte, offset, ptr, cp;
var big5lead = 0x00;
var endofstream = 2000000;
var finished = false;
while (!finished) {
if (bytes.length == 0) byte = endofstream;
else byte = bytes.shift();
if (byte == endofstream && big5lead != 0x00) {
big5lead = 0x00;
out += "�";
continue;
}
if (byte == endofstream && big5lead == 0x00) {
finished = true;
continue;
}
if (big5lead != 0x00) {
lead = big5lead;
ptr = null;
big5lead = 0x00;
if (byte < 0x7f) offset = 0x40;
else offset = 0x62;
if ((byte >= 0x40 && byte <= 0x7e) || (byte >= 0xa1 && byte <= 0xfe))
ptr = (lead - 0x81) * 157 + (byte - offset);
// "If there is a row in the table below whose first column is pointer, return the two code points listed in its second column"
switch (ptr) {
case 1133:
out += "Ê̄";
continue;
case 1135:
out += "Ê̌";
continue;
case 1164:
out += "ê̄";
continue;
case 1166:
out += "ê̌";
continue;
}
if (ptr == null) cp = null;
else cp = big5[ptr];
if (cp == null && byte >= 0x00 && byte <= 0x7f) {
bytes.unshift(byte);
}
if (cp == null) {
out += "�";
continue;
}
out += dec2char(cp);
continue;
}
if (byte >= 0x00 && byte <= 0x7f) {
out += dec2char(byte);
continue;
}
if (byte >= 0x81 && byte <= 0xfe) {
big5lead = byte;
continue;
}
out += "�";
}
return out;
}
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