79 lines
2.4 KiB
JavaScript
79 lines
2.4 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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class Zerocoder {
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static Encode(buf, start, end) {
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let bytes = 0;
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let zero = 0;
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for (let i = start; i <= end; i++) {
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if (buf[i] === 0) {
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zero++;
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}
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else {
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if (zero > 0) {
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bytes += (zero - 2);
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zero = 0;
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}
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}
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}
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if (zero > 0) {
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bytes += (zero - 2);
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}
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const newBuf = Buffer.allocUnsafe(end - bytes);
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buf.copy(newBuf, 0, 0, start);
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let newBufIndex = start;
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zero = 0;
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for (let i = start; i <= end; i++) {
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if (buf[i] === 0) {
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zero++;
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}
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else {
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if (zero > 0) {
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newBuf[newBufIndex++] = 0;
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newBuf.writeUInt8(zero, newBufIndex++);
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zero = 0;
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}
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newBuf[newBufIndex++] = buf[i];
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}
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}
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if (zero > 0) {
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newBuf[newBufIndex++] = 0;
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newBuf.writeUInt8(zero, newBufIndex);
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}
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return newBuf;
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}
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static Decode(buf, start, end, tail) {
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let bytes = 0;
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let zero = false;
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for (let i = start; i <= end; i++) {
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if (zero === true) {
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zero = false;
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bytes += buf.readUInt8(i) - 2;
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}
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else if (buf[i] === 0 && i <= (end - tail)) {
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zero = true;
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}
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}
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const newBuf = Buffer.allocUnsafe((end + 1) + bytes);
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buf.copy(newBuf, 0, 0, start - 1);
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let newBufIndex = start;
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zero = false;
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for (let i = start; i <= end; i++) {
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if (zero === true) {
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zero = false;
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const zeroCount = buf.readUInt8(i);
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for (let x = 0; x < zeroCount; x++) {
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newBuf[newBufIndex++] = 0;
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}
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}
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else if (buf[i] === 0 && i <= (end - tail)) {
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zero = true;
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}
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else {
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newBuf[newBufIndex++] = buf[i];
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}
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}
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return newBuf;
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}
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}
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exports.Zerocoder = Zerocoder;
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//# sourceMappingURL=Zerocoder.js.map
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