60 lines
1.7 KiB
HTML
60 lines
1.7 KiB
HTML
<!DOCTYPE html>
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<script src="lib/encoding-indexes.js"></script>
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<script src="lib/encoding.js"></script>
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<script>
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function encodeArrayOfStrings(strings) {
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var encoder, encoded, len, i, bytes, view, offset;
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encoder = new TextEncoder();
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encoded = [];
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len = Uint32Array.BYTES_PER_ELEMENT;
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for (i = 0; i < strings.length; i += 1) {
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len += Uint32Array.BYTES_PER_ELEMENT;
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encoded[i] = new TextEncoder().encode(strings[i]);
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len += encoded[i].byteLength;
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}
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bytes = new Uint8Array(len);
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view = new DataView(bytes.buffer);
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offset = 0;
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view.setUint32(offset, strings.length);
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offset += Uint32Array.BYTES_PER_ELEMENT;
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for (i = 0; i < encoded.length; i += 1) {
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len = encoded[i].byteLength;
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view.setUint32(offset, len);
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offset += Uint32Array.BYTES_PER_ELEMENT;
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bytes.set(encoded[i], offset);
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offset += len;
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}
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return bytes.buffer;
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}
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function decodeArrayOfStrings(buffer, encoding) {
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var decoder, view, offset, num_strings, strings, i, len;
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decoder = new TextDecoder(encoding);
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view = new DataView(buffer);
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offset = 0;
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strings = [];
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num_strings = view.getUint32(offset);
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offset += Uint32Array.BYTES_PER_ELEMENT;
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for (i = 0; i < num_strings; i += 1) {
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len = view.getUint32(offset);
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offset += Uint32Array.BYTES_PER_ELEMENT;
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strings[i] = decoder.decode(
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new DataView(view.buffer, offset, len));
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offset += len;
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}
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return strings;
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}
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var strings = ["Hello", "string", "encoding!"];
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var buffer = encodeArrayOfStrings(strings);
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var results = decodeArrayOfStrings(buffer, "utf-8");
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document.write("Encoded " + JSON.stringify(strings) + "<br>");
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document.write("Decoded " + JSON.stringify(results) + "<br>");
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</script>
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