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