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This commit is contained in:
Gustave Monce
2021-08-09 20:21:09 +02:00
parent 9865ef7f79
commit 847ce0506d
411 changed files with 5922 additions and 54941 deletions
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7zip/Common/CRC.cs
+17 -8
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@@ -2,7 +2,7 @@
namespace SevenZip
{
class CRC
internal class CRC
{
public static readonly uint[] Table;
@@ -14,42 +14,51 @@ namespace SevenZip
{
uint r = i;
for (int j = 0; j < 8; j++)
{
if ((r & 1) != 0)
{
r = (r >> 1) ^ kPoly;
}
else
{
r >>= 1;
}
}
Table[i] = r;
}
}
uint _value = 0xFFFFFFFF;
private uint _value = 0xFFFFFFFF;
public void Init() { _value = 0xFFFFFFFF; }
public void UpdateByte(byte b)
{
_value = Table[(((byte)(_value)) ^ b)] ^ (_value >> 8);
_value = Table[((byte)(_value)) ^ b] ^ (_value >> 8);
}
public void Update(byte[] data, uint offset, uint size)
{
for (uint i = 0; i < size; i++)
_value = Table[(((byte)(_value)) ^ data[offset + i])] ^ (_value >> 8);
{
_value = Table[((byte)(_value)) ^ data[offset + i]] ^ (_value >> 8);
}
}
public uint GetDigest() { return _value ^ 0xFFFFFFFF; }
static uint CalculateDigest(byte[] data, uint offset, uint size)
private static uint CalculateDigest(byte[] data, uint offset, uint size)
{
CRC crc = new CRC();
CRC crc = new();
// crc.Init();
crc.Update(data, offset, size);
return crc.GetDigest();
}
static bool VerifyDigest(uint digest, byte[] data, uint offset, uint size)
private static bool VerifyDigest(uint digest, byte[] data, uint offset, uint size)
{
return (CalculateDigest(data, offset, size) == digest);
return CalculateDigest(data, offset, size) == digest;
}
}
}