private bool CompareCrc64(string localFile, string crc64ecma)
{
Crc64.InitECMA();
String hash = String.Empty;
using (FileStream fs = File.Open(localFile, FileMode.Open))
{
byte[] buffer = new byte[2048];
int bytesRead;
ulong crc = 0;
while ((bytesRead = fs.Read(buffer, 0, buffer.Length)) > 0)
{
ulong partCrc = Crc64.Compute(buffer, 0, bytesRead);
if (crc == 0)
{
crc = partCrc;
}
else
{
crc = Crc64.Combine(crc, partCrc, bytesRead);
}
}
localFileCrc64 = crc.ToString();
return(localFileCrc64 == crc64ecma);
}
}
public void TestCrcCore()
{
string testStr = "This is a test.";
byte[] content = Encoding.ASCII.GetBytes(testStr);
Crc64.InitECMA();
ulong crc = Crc64.Compute(content, 0, content.Length, 0);
Assert.AreEqual(crc, 2186167744391481992);
}
public void TestCrcCompute()
{
ulong[] crcVals = { 0x0 /*0*/, 0x330284772E652B05, 0xBC6573200E84B046, 0x2CD8094A1A277627, 0x3C9D28596E5960BA,
0x40BDF58FB0895F2 /*5*/, 0xD08E9F8545A700F4, 0xEC20A3A8CC710E66, 0x67B4F30A647A0C59, 0x9966F6C89D56EF8E,
0x32093A2ECD5773F4 /*10*/, 0x8A0825223EA6D221, 0x8562C0AC2AB9A00D, 0x3EE2A39C083F38B4, 0x1F603830353E518A,
0x2FD681D7B2421FD /*15*/, 0x790EF2B16A745A41, 0x3EF8F06DACCDCDDF, 0x49E41B2660B106D, 0x561CC0CFA235AC68,
0xD4FE9EF082E69F59 /*20*/, 0xE3B5E46CD8D63A4D, 0x865AAF6B94F2A051, 0x7ECA10D2F8136EB4, 0xD7DD118C98E98727,
0x70FB33C119C29318 /*25*/, 0x57C891E39A97D9B7, 0xA1F46BA20AD06EB7, 0x7AD25FAFA1710407, 0x73CEF1666185C13F,
0xB41858F73C389602 /*30*/ };
string[] textVals = { "" /*0*/, "a", "ab", "abc", "abcd", "abcde" /*5*/, "abcdef", "abcdefg", "abcdefgh", "abcdefghi", "abcdefghij" /*10*/,
"Discard medicine more than two years old.",
"He who has a shady past knows that nice guys finish last.",
"I wouldn't marry him with a ten foot pole.",
"Free! Free!/A trip/to Mars/for 900/empty jars/Burma Shave",
"The days of the digital watch are numbered. -Tom Stoppard" /*15*/,
"Nepal premier won't resign.",
"For every action there is an equal and opposite government program.",
"His money is twice tainted: 'taint yours and 'taint mine.",
"There is no reason for any individual to have a computer in their home. -Ken Olsen, 1977",
"It's a tiny change to the code and not completely disgusting. - Bob Manchek" /*20*/,
"size: a.out: bad magic",
"The major problem is with sendmail. -Mark Horton",
"Give me a rock, paper and scissors and I will move the world. CCFestoon",
"If the enemy is within range, then so are you.",
"It's well we cannot hear the screams/That we create in others' dreams." /*25*/,
"You remind me of a TV show, but that's all right: I watch it anyway.",
"C is as portable as Stonehedge!!",
"Even if I could be Shakespeare, I think I should still choose to be Faraday. - A. Huxley",
"The fugacity of a constituent in a mixture of gases at a given temperature is proportional to its mole fraction. Lewis-Randall Rule",
"How can you write a big system without C++? -Paul Glick" /*30*/ };
Crc64.InitECMA();
for (int i = 0; i < crcVals.Length; i++)
{
byte[] content = Encoding.ASCII.GetBytes(textVals[i]);
ulong crc = Crc64.Compute(content, 0, content.Length, 0);
System.Console.WriteLine("{0:X}", crc);
Assert.AreEqual(crc, crcVals[i]);
}
}
public void TestCombine()
{
string str1 = "this is a test.";
string str2 = "hello world.";
string str = str1 + str2;
byte[] content1 = Encoding.ASCII.GetBytes(str1);
byte[] content2 = Encoding.ASCII.GetBytes(str2);
byte[] content = Encoding.ASCII.GetBytes(str);
Crc64.InitECMA();
ulong crc1 = Crc64.Compute(content1, 0, content1.Length);
ulong crc2 = Crc64.Compute(content2, 0, content2.Length);
ulong crc = Crc64.Compute(content, 0, content.Length);
Assert.AreEqual(crc, Crc64.Combine(crc1, crc2, content2.Length));
ulong crc3 = Crc64.Compute(content2, 0, content2.Length, crc1);
Assert.AreEqual(crc3, crc);
}
public void TestCrcCombine()
{
string text = "Even if I could be Shakespeare, I think I should still choose to be Faraday. - A. Huxley";
byte[] content = Encoding.ASCII.GetBytes(text);
Crc64.InitECMA();
ulong crc = Crc64.Compute(content, 0, content.Length);
for (int i = 1; i < text.Length; i++)
{
string before = text.Substring(0, i);
string after = text.Substring(i);
byte[] content1 = Encoding.ASCII.GetBytes(before);
byte[] content2 = Encoding.ASCII.GetBytes(after);
ulong crc1 = Crc64.Compute(content1, 0, content1.Length);
ulong crc2 = Crc64.Compute(content2, 0, content2.Length);
Assert.AreEqual(crc, Crc64.Combine(crc1, crc2, content2.Length));
ulong crc3 = Crc64.Compute(content2, 0, content2.Length, crc1);
Assert.AreEqual(crc3, crc);
}
}
public Crc64HashAlgorithm()
{
Crc64.InitECMA();
}
public override void Initialize()
{
Crc64.InitECMA();
}
