package com.gamebuster19901.excitemail;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
public class CRCTester {
private final byte[] data;
public CRCTester(InputStream inputStream) throws IOException {
data = inputStream.readAllBytes();
}
public int test(int maxLength, final int seed) {
ByteBuffer param1 = ByteBuffer.wrap(data);
byte pos1;
byte pos2;
byte pos3;
byte pos4;
byte pos5;
byte pos6;
byte bVar7;
boolean bVar8;
int leftoverBytes;
int bytesEvaluated;
@Unsigned Integer uVar11;
@Unsigned Integer bytesRemaining;
uVar11 = seed;
if(3 < maxLength) {
pos1 = param1.get();
maxLength = maxLength - 4;
pos2 = param1.get();
bVar7 = pos1;
pos3 = param1.get();
param1 = newAdjustedBuffer(param1, 4);
uVar11 = bVar7 << 0x18 | pos1 << 0x10 | pos2 << 8 | pos3;
}
bytesEvaluated = 0;
if(0 < maxLength) {
if (8 < maxLength) {
bVar8 = false;
if (-1 < maxLength && maxLength < 0x7fffffff) {
bVar8 = true;
}
if(bVar8 && (bytesRemaining = maxLength - 1 >>> 3) == 0 && 0 < maxLength - 8) { //this is almost certainty a for loop. Also bytesRemaining = (maxLength - 1) / 8
do {
bytesEvaluated = bytesEvaluated + 8;
uVar11 = (uVar11 << 8 | param1.getInt(0)) ^ (seed + (uVar11 >>> 0x16 & 0x3fc));
pos1 = param1.get();
pos2 = param1.get();
pos3 = param1.get();
uVar11 = (uVar11 << 8 | param1.getInt(1)) ^ (seed + (uVar11 >>> 0x16 & 0x3fc));
pos4 = param1.get();
pos5 = param1.get();
pos6 = param1.get();
param1 = newAdjustedBuffer(param1, 8);
uVar11 = (uVar11 << 8 | pos1) ^ (seed + (uVar11 >>> 0x16 & 0x3fc));
uVar11 = (uVar11 << 8 | pos2) ^ (seed + (uVar11 >>> 0x16 & 0x3fc));
uVar11 = (uVar11 << 8 | pos3) ^ (seed + (uVar11 >>> 0x16 & 0x3fc));
uVar11 = (uVar11 << 8 | pos4) ^ (seed + (uVar11 >>> 0x16 & 0x3fc));
uVar11 = (uVar11 << 8 | pos5) ^ (seed + (uVar11 >>> 0x16 & 0x3fc));
uVar11 = (uVar11 << 8 | pos6) ^ (seed + (uVar11 >>> 0x16 & 0x3fc));
bytesRemaining = bytesRemaining - 1;
}
while (bytesRemaining != 0);
}
}
}
leftoverBytes = maxLength - bytesEvaluated;
if(bytesEvaluated < maxLength) {
do {
bVar7 = param1.get();
param1 = newAdjustedBuffer(param1, 1);
uVar11 = (uVar11 << 8 | bVar7) ^ (seed + (uVar11 >>> 0x16 & 0x3fc));
leftoverBytes = leftoverBytes - 1;
}
while (leftoverBytes != 0);
}
return ~uVar11;
}
private ByteBuffer newAdjustedBuffer(ByteBuffer prevBuffer, int amount) {
byte[] remainingBytes = new byte[prevBuffer.limit() - 1];
prevBuffer.get(remainingBytes, 1, remainingBytes.length);
return ByteBuffer.wrap(remainingBytes);
}
}
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