@loaders.gl/pcd
Version:
Framework-independent loader for the PCD format
59 lines (58 loc) • 1.77 kB
JavaScript
/* eslint-disable */
/**
* from https://gitlab.com/taketwo/three-pcd-loader/blob/master/decompress-lzf.js
* @param inData
* @param outLength
* @returns
*/
export function decompressLZF(inData, outLength) {
const inLength = inData.length;
const outData = new Uint8Array(outLength);
let inPtr = 0;
let outPtr = 0;
let ctrl;
let len;
let ref;
do {
ctrl = inData[inPtr++];
if (ctrl < 1 << 5) {
ctrl++;
if (outPtr + ctrl > outLength) {
throw new Error('Output buffer is not large enough');
}
if (inPtr + ctrl > inLength) {
throw new Error('Invalid compressed data');
}
do {
outData[outPtr++] = inData[inPtr++];
} while (--ctrl);
}
else {
len = ctrl >> 5;
ref = outPtr - ((ctrl & 0x1f) << 8) - 1;
if (inPtr >= inLength) {
throw new Error('Invalid compressed data');
}
if (len === 7) {
len += inData[inPtr++];
if (inPtr >= inLength) {
throw new Error('Invalid compressed data');
}
}
ref -= inData[inPtr++];
if (outPtr + len + 2 > outLength) {
throw new Error('Output buffer is not large enough');
}
if (ref < 0) {
throw new Error('Invalid compressed data');
}
if (ref >= outPtr) {
throw new Error('Invalid compressed data');
}
do {
outData[outPtr++] = outData[ref++];
} while (--len + 2);
}
} while (inPtr < inLength);
return outData;
}