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var big5CPs = []; // index is unicode cp, value is pointer
for (var p = 5024; p < big5.length; p++) {
// "Let index be index jis0208 excluding all pointers in the range 8272 to 8835, inclusive."
if (big5[p] != null && big5CPs[big5[p]] == null) {
big5CPs[big5[p]] = p;
}
}
// If code point is U+2550, U+255E, U+2561, U+256A, U+5341, or U+5345, return the last pointer corresponding to code point in index.
big5CPs[0x2550] = 18991;
big5CPs[0x255e] = 18975;
big5CPs[0x2561] = 18977;
big5CPs[0x256a] = 18976;
big5CPs[0x5341] = 5512;
big5CPs[0x5345] = 5599;
function chars2cps(chars) {
// this is needed because of javascript's handling of supplementary characters
// char: a string of unicode characters
// returns an array of decimal code point values
var haut = 0;
var out = [];
for (var i = 0; i < chars.length; i++) {
var b = chars.charCodeAt(i);
if (b < 0 || b > 0xffff) {
alert("Error in chars2cps: byte out of range " + b.toString(16) + "!");
}
if (haut != 0) {
if (0xdc00 <= b && b <= 0xdfff) {
out.push(0x10000 + ((haut - 0xd800) << 10) + (b - 0xdc00));
haut = 0;
continue;
} else {
alert(
"Error in chars2cps: surrogate out of range " +
haut.toString(16) +
"!"
);
haut = 0;
}
}
if (0xd800 <= b && b <= 0xdbff) {
haut = b;
} else {
out.push(b);
}
}
return out;
}
function big5Encoder(stream) {
var cps = chars2cps(stream);
var out = "";
var cp;
var finished = false;
var endofstream = 2000000;
while (!finished) {
if (cps.length == 0) cp = endofstream;
else cp = cps.shift();
var cpx = 0;
if (cp == endofstream) {
finished = true;
continue;
}
if (cp >= 0x00 && cp <= 0x7f) {
// ASCII
out += " " + cp.toString(16).toUpperCase();
continue;
}
var ptr = big5CPs[cp];
if (ptr == null) {
return null;
// out += ' &#'+cp+';'
// continue
}
var lead = Math.floor(ptr / 157) + 0x81;
var trail = ptr % 157;
var offset;
if (trail < 0x3f) offset = 0x40;
else {
offset = 0x62;
}
var end = trail + offset;
out +=
" " +
lead.toString(16).toUpperCase() +
" " +
end.toString(16).toUpperCase();
}
return out.trim();
}
function convertToHex(str) {
// converts a string of ASCII characters to hex byte codes
var out = "";
var result;
for (var c = 0; c < str.length; c++) {
result = str.charCodeAt(c).toString(16).toUpperCase() + " ";
out += result;
}
return out;
}
function normalizeStr(str) {
var out = "";
for (var c = 0; c < str.length; c++) {
if (str.charAt(c) == "%") {
out += String.fromCodePoint(
parseInt(str.charAt(c + 1) + str.charAt(c + 2), 16)
);
c += 2;
} else out += str.charAt(c);
}
var result = "";
for (var o = 0; o < out.length; o++) {
result += "%" + out.charCodeAt(o).toString(16).toUpperCase();
}
return result.replace(/%1B%28%42$/, "");
}