forked from LeenkxTeam/Kmake
87 lines
2.0 KiB
JavaScript
87 lines
2.0 KiB
JavaScript
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function dec2char(n) {
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// converts a decimal number to a Unicode character
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// n: the dec codepoint value to be converted
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if (n <= 0xffff) {
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out = String.fromCharCode(n);
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} else if (n <= 0x10ffff) {
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n -= 0x10000;
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out =
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String.fromCharCode(0xd800 | (n >> 10)) +
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String.fromCharCode(0xdc00 | (n & 0x3ff));
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} else out = "dec2char error: Code point out of range: " + n;
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return out;
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}
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function big5Decoder(stream) {
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stream = stream.replace(/%/g, " ");
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stream = stream.replace(/[\s]+/g, " ").trim();
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var bytes = stream.split(" ");
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for (var i = 0; i < bytes.length; i++) bytes[i] = parseInt(bytes[i], 16);
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var out = "";
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var lead, byte, offset, ptr, cp;
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var big5lead = 0x00;
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var endofstream = 2000000;
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var finished = false;
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while (!finished) {
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if (bytes.length == 0) byte = endofstream;
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else byte = bytes.shift();
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if (byte == endofstream && big5lead != 0x00) {
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big5lead = 0x00;
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out += "<22>";
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continue;
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}
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if (byte == endofstream && big5lead == 0x00) {
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finished = true;
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continue;
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}
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if (big5lead != 0x00) {
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lead = big5lead;
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ptr = null;
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big5lead = 0x00;
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if (byte < 0x7f) offset = 0x40;
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else offset = 0x62;
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if ((byte >= 0x40 && byte <= 0x7e) || (byte >= 0xa1 && byte <= 0xfe))
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ptr = (lead - 0x81) * 157 + (byte - offset);
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// "If there is a row in the table below whose first column is pointer, return the two code points listed in its second column"
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switch (ptr) {
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case 1133:
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out += "Ê̄";
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continue;
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case 1135:
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out += "Ê̌";
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continue;
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case 1164:
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out += "ê̄";
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continue;
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case 1166:
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out += "ê̌";
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continue;
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}
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if (ptr == null) cp = null;
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else cp = big5[ptr];
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if (cp == null && byte >= 0x00 && byte <= 0x7f) {
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bytes.unshift(byte);
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}
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if (cp == null) {
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out += "<22>";
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continue;
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}
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out += dec2char(cp);
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continue;
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}
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if (byte >= 0x00 && byte <= 0x7f) {
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out += dec2char(byte);
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continue;
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}
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if (byte >= 0x81 && byte <= 0xfe) {
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big5lead = byte;
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continue;
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}
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out += "<22>";
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}
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return out;
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}
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