// Token: 0x0600019C RID: 412 RVA: 0x00002C1F File Offset: 0x00000E1F
public static int SizeCompressed(byte[] source)
{
if (SafeQuickLZ.HeaderLength(source) == 9)
{
return((int)source[1] | (int)source[2] << 8 | (int)source[3] << 16 | (int)source[4] << 24);
}
return((int)source[1]);
}
// Token: 0x0600019B RID: 411 RVA: 0x00002BF8 File Offset: 0x00000DF8
public static int SizeDecompressed(byte[] source)
{
if (SafeQuickLZ.HeaderLength(source) == 9)
{
return((int)source[5] | (int)source[6] << 8 | (int)source[7] << 16 | (int)source[8] << 24);
}
return((int)source[2]);
}
// Token: 0x0600019D RID: 413 RVA: 0x0000B104 File Offset: 0x00009304
private static void WriteHeader(byte[] dst, int level, bool compressible, int sizeCompressed, int sizeDecompressed)
{
dst[0] = (byte)(2 | (compressible ? 1 : 0));
int num = 0;
dst[num] |= (byte)(level << 2);
int num2 = 0;
dst[num2] |= 64;
int num3 = 0;
dst[num3] = dst[num3];
SafeQuickLZ.FastWrite(dst, 1, sizeDecompressed, 4);
SafeQuickLZ.FastWrite(dst, 5, sizeCompressed, 4);
}
public void SmallDataCompressionTestLevel1()
{
SafeQuickLZ safeQuickLZtest = new SafeQuickLZ();
byte[] smallData = new byte[100];
// Fill the small data array with random data.
new Random().NextBytes(smallData);
// Store the compressed data.
byte[] smallDataCompressed = safeQuickLZtest.Compress(smallData, 0, smallData.Length, 1);
// The original should not equal the compressed data.
Assert.AreNotEqual(smallData, smallDataCompressed, "Original data is equal to the compressed data!");
// Store the decompressed data.
byte[] smallDataDecompressed = safeQuickLZtest.Decompress(smallDataCompressed, 0, smallDataCompressed.Length);
// The compressed data should not equal the decompressed data.
Assert.AreNotEqual(smallDataCompressed, smallDataDecompressed, "Compressed data is equal to the decompressed data!");
// The original data must equal the decompressed data; must be able to make a round-trip.
CollectionAssert.AreEqual(smallData, smallDataDecompressed, "Original data does not match the decompressed data!");
}
// Token: 0x0600019E RID: 414 RVA: 0x0000B174 File Offset: 0x00009374
public static byte[] Compress(byte[] source, int level = 3)
{
if (source.Length == 0)
{
return(new byte[0]);
}
switch (level)
{
case 1:
{
int[,] array = new int[4096, 1];
goto IL_4C;
}
case 3:
{
int[,] array = new int[4096, 16];
goto IL_4C;
}
}
throw new ArgumentException("C# version only supports level 1 and 3");
IL_4C:
int i = 0;
int num = 13;
uint num2 = 2147483648U;
int i2 = 9;
byte[] array2 = new byte[source.Length + 400];
int[] array3 = new int[4096];
byte[] array4 = new byte[4096];
int num3 = 0;
int num4 = source.Length - 6 - 4 - 1;
int num5 = 0;
if (0 <= num4)
{
num3 = ((int)source[i] | (int)source[i + 1] << 8 | (int)source[i + 2] << 16);
}
byte[] array5;
while (i <= num4)
{
if ((num2 & 1U) == 1U)
{
if (i > source.Length >> 1 && num > i - (i >> 5))
{
array5 = new byte[source.Length + 9];
SafeQuickLZ.WriteHeader(array5, level, false, source.Length, source.Length + 9);
Array.Copy(source, 0, array5, 9, source.Length);
return(array5);
}
SafeQuickLZ.FastWrite(array2, i2, (int)(num2 >> 1 | 2147483648U), 4);
i2 = num;
num += 4;
num2 = 2147483648U;
}
if (level == 1)
{
int num6 = (num3 >> 12 ^ num3) & 4095;
int[,] array;
int num7 = array[num6, 0];
int num8 = array3[num6] ^ num3;
array3[num6] = num3;
array[num6, 0] = i;
if (num8 == 0 && array4[num6] != 0 && (i - num7 > 2 || (i == num7 + 1 && num5 >= 3 && i > 3 && source[i] == source[i - 3] && source[i] == source[i - 2] && source[i] == source[i - 1] && source[i] == source[i + 1] && source[i] == source[i + 2])))
{
num2 = (num2 >> 1 | 2147483648U);
if (source[num7 + 3] != source[i + 3])
{
int num9 = 1 | num6 << 4;
array2[num] = (byte)num9;
array2[num + 1] = (byte)(num9 >> 8);
i += 3;
num += 2;
}
else
{
int num10 = i;
int num11 = (source.Length - 4 - i + 1 - 1 > 255) ? 255 : (source.Length - 4 - i + 1 - 1);
i += 4;
if (source[num7 + i - num10] == source[i])
{
i++;
if (source[num7 + i - num10] == source[i])
{
i++;
while (source[num7 + (i - num10)] == source[i] && i - num10 < num11)
{
i++;
}
}
}
int num12 = i - num10;
num6 <<= 4;
if (num12 < 18)
{
int num13 = num6 | num12 - 2;
array2[num] = (byte)num13;
array2[num + 1] = (byte)(num13 >> 8);
num += 2;
}
else
{
SafeQuickLZ.FastWrite(array2, num, num6 | num12 << 16, 3);
num += 3;
}
}
num3 = ((int)source[i] | (int)source[i + 1] << 8 | (int)source[i + 2] << 16);
num5 = 0;
}
else
{
num5++;
array4[num6] = 1;
array2[num] = source[i];
num2 >>= 1;
i++;
num++;
num3 = ((num3 >> 8 & 65535) | (int)source[i + 2] << 16);
}
}
else
{
num3 = ((int)source[i] | (int)source[i + 1] << 8 | (int)source[i + 2] << 16);
int num14 = (source.Length - 4 - i + 1 - 1 > 255) ? 255 : (source.Length - 4 - i + 1 - 1);
int num15 = (num3 >> 12 ^ num3) & 4095;
byte b = array4[num15];
int num16 = 0;
int num17 = 0;
int num18 = 0;
int[,] array;
int num19;
while (num18 < 16 && (int)b > num18)
{
num19 = array[num15, num18];
if ((byte)num3 == source[num19] && (byte)(num3 >> 8) == source[num19 + 1] && (byte)(num3 >> 16) == source[num19 + 2] && num19 < i - 2)
{
int num20 = 3;
while (source[num19 + num20] == source[i + num20] && num20 < num14)
{
num20++;
}
if (num20 > num16 || (num20 == num16 && num19 > num17))
{
num17 = num19;
num16 = num20;
}
}
num18++;
}
num19 = num17;
array[num15, (int)(b & 15)] = i;
b += 1;
array4[num15] = b;
if (num16 >= 3 && i - num19 < 131071)
{
int num21 = i - num19;
for (int j = 1; j < num16; j++)
{
num3 = ((int)source[i + j] | (int)source[i + j + 1] << 8 | (int)source[i + j + 2] << 16);
num15 = ((num3 >> 12 ^ num3) & 4095);
byte[] array6 = array4;
int num22 = num15;
byte b2;
array6[num22] = (b2 = array6[num22]) + 1;
b = b2;
array[num15, (int)(b & 15)] = i + j;
}
i += num16;
num2 = (num2 >> 1 | 2147483648U);
if (num16 == 3 && num21 <= 63)
{
SafeQuickLZ.FastWrite(array2, num, num21 << 2, 1);
num++;
}
else if (num16 == 3 && num21 <= 16383)
{
SafeQuickLZ.FastWrite(array2, num, num21 << 2 | 1, 2);
num += 2;
}
else if (num16 <= 18 && num21 <= 1023)
{
SafeQuickLZ.FastWrite(array2, num, num16 - 3 << 2 | num21 << 6 | 2, 2);
num += 2;
}
else if (num16 <= 33)
{
SafeQuickLZ.FastWrite(array2, num, num16 - 2 << 2 | num21 << 7 | 3, 3);
num += 3;
}
else
{
SafeQuickLZ.FastWrite(array2, num, num16 - 3 << 7 | num21 << 15 | 3, 4);
num += 4;
}
num5 = 0;
}
else
{
array2[num] = source[i];
num2 >>= 1;
i++;
num++;
}
}
}
while (i <= source.Length - 1)
{
if ((num2 & 1U) == 1U)
{
SafeQuickLZ.FastWrite(array2, i2, (int)(num2 >> 1 | 2147483648U), 4);
i2 = num;
num += 4;
num2 = 2147483648U;
}
array2[num] = source[i];
i++;
num++;
num2 >>= 1;
}
while ((num2 & 1U) != 1U)
{
num2 >>= 1;
}
SafeQuickLZ.FastWrite(array2, i2, (int)(num2 >> 1 | 2147483648U), 4);
SafeQuickLZ.WriteHeader(array2, level, true, source.Length, num);
array5 = new byte[num];
Array.Copy(array2, array5, num);
return(array5);
}
// Token: 0x060001A0 RID: 416 RVA: 0x0000B7BC File Offset: 0x000099BC
public static byte[] Decompress(byte[] source)
{
if (source.Length == 0)
{
return(new byte[0]);
}
int num = source[0] >> 2 & 3;
if (num != 1 && num != 3)
{
throw new ArgumentException("C# version only supports level 1 and 3");
}
int num2 = SafeQuickLZ.SizeDecompressed(source);
int num3 = SafeQuickLZ.HeaderLength(source);
int i = 0;
uint num4 = 1U;
byte[] array = new byte[num2];
int[] array2 = new int[4096];
byte[] array3 = new byte[4096];
int num5 = num2 - 6 - 4 - 1;
int j = -1;
uint num6 = 0U;
if ((source[0] & 1) != 1)
{
byte[] array4 = new byte[num2];
Array.Copy(source, SafeQuickLZ.HeaderLength(source), array4, 0, num2);
return(array4);
}
for (;;)
{
if (num4 == 1U)
{
num4 = (uint)((int)source[num3] | (int)source[num3 + 1] << 8 | (int)source[num3 + 2] << 16 | (int)source[num3 + 3] << 24);
num3 += 4;
if (i <= num5)
{
if (num == 1)
{
num6 = (uint)((int)source[num3] | (int)source[num3 + 1] << 8 | (int)source[num3 + 2] << 16);
}
else
{
num6 = (uint)((int)source[num3] | (int)source[num3 + 1] << 8 | (int)source[num3 + 2] << 16 | (int)source[num3 + 3] << 24);
}
}
}
if ((num4 & 1U) == 1U)
{
num4 >>= 1;
uint num8;
uint num9;
if (num == 1)
{
int num7 = (int)num6 >> 4 & 4095;
num8 = (uint)array2[num7];
if ((num6 & 15U) != 0U)
{
num9 = (num6 & 15U) + 2U;
num3 += 2;
}
else
{
num9 = (uint)source[num3 + 2];
num3 += 3;
}
}
else
{
uint num10;
if ((num6 & 3U) == 0U)
{
num10 = (num6 & 255U) >> 2;
num9 = 3U;
num3++;
}
else if ((num6 & 2U) == 0U)
{
num10 = (num6 & 65535U) >> 2;
num9 = 3U;
num3 += 2;
}
else if ((num6 & 1U) == 0U)
{
num10 = (num6 & 65535U) >> 6;
num9 = (num6 >> 2 & 15U) + 3U;
num3 += 2;
}
else if ((num6 & 127U) != 3U)
{
num10 = (num6 >> 7 & 131071U);
num9 = (num6 >> 2 & 31U) + 2U;
num3 += 3;
}
else
{
num10 = num6 >> 15;
num9 = (num6 >> 7 & 255U) + 3U;
num3 += 4;
}
num8 = (uint)((long)i - (long)((ulong)num10));
}
array[i] = array[(int)((UIntPtr)num8)];
array[i + 1] = array[(int)((UIntPtr)(num8 + 1U))];
array[i + 2] = array[(int)((UIntPtr)(num8 + 2U))];
int num11 = 3;
while ((long)num11 < (long)((ulong)num9))
{
array[i + num11] = array[(int)(checked ((IntPtr)(unchecked ((ulong)num8 + (ulong)((long)num11)))))];
num11++;
}
i += (int)num9;
if (num == 1)
{
num6 = (uint)((int)array[j + 1] | (int)array[j + 2] << 8 | (int)array[j + 3] << 16);
while ((long)j < (long)i - (long)((ulong)num9))
{
j++;
int num7 = (int)((num6 >> 12 ^ num6) & 4095U);
array2[num7] = j;
array3[num7] = 1;
num6 = (uint)((ulong)(num6 >> 8 & 65535U) | (ulong)((long)((long)array[j + 3] << 16)));
}
num6 = (uint)((int)source[num3] | (int)source[num3 + 1] << 8 | (int)source[num3 + 2] << 16);
}
else
{
num6 = (uint)((int)source[num3] | (int)source[num3 + 1] << 8 | (int)source[num3 + 2] << 16 | (int)source[num3 + 3] << 24);
}
j = i - 1;
}
else
{
if (i > num5)
{
break;
}
array[i] = source[num3];
i++;
num3++;
num4 >>= 1;
if (num == 1)
{
while (j < i - 3)
{
j++;
int num12 = (int)array[j] | (int)array[j + 1] << 8 | (int)array[j + 2] << 16;
int num7 = (num12 >> 12 ^ num12) & 4095;
array2[num7] = j;
array3[num7] = 1;
}
num6 = (uint)((ulong)(num6 >> 8 & 65535U) | (ulong)((long)((long)source[num3 + 2] << 16)));
}
else
{
num6 = (uint)((ulong)(num6 >> 8 & 65535U) | (ulong)((long)((long)source[num3 + 2] << 16)) | (ulong)((long)((long)source[num3 + 3] << 24)));
}
}
}
while (i <= num2 - 1)
{
if (num4 == 1U)
{
num3 += 4;
num4 = 2147483648U;
}
array[i] = source[num3];
i++;
num3++;
num4 >>= 1;
}
return(array);
}
