From cb4a46e7fbe62d788e66ed6121c717a2d22a4d7c Mon Sep 17 00:00:00 2001
From: watcherhd <watcherhd@e753b5eb-9565-29b2-b5c5-2cc6f99dfbcb>
Date: Thu, 21 Apr 2011 14:14:52 +0000
Subject: svn.miranda.im is moving to a new home!

git-svn-id: http://miranda-plugins.googlecode.com/svn/trunk@7 e753b5eb-9565-29b2-b5c5-2cc6f99dfbcb
---
 cryptopp/crypto/adler32.cpp | 77 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 cryptopp/crypto/adler32.cpp

(limited to 'cryptopp/crypto/adler32.cpp')

diff --git a/cryptopp/crypto/adler32.cpp b/cryptopp/crypto/adler32.cpp
new file mode 100644
index 0000000..2270202
--- /dev/null
+++ b/cryptopp/crypto/adler32.cpp
@@ -0,0 +1,77 @@
+// adler32.cpp - written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+#include "adler32.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+void Adler32::Update(const byte *input, size_t length)
+{
+	const unsigned long BASE = 65521;
+
+	unsigned long s1 = m_s1;
+	unsigned long s2 = m_s2;
+
+	if (length % 8 != 0)
+	{
+		do
+		{
+			s1 += *input++;
+			s2 += s1;
+			length--;
+		} while (length % 8 != 0);
+
+		if (s1 >= BASE)
+			s1 -= BASE;
+		s2 %= BASE;
+	}
+
+	while (length > 0)
+	{
+		s1 += input[0]; s2 += s1;
+		s1 += input[1]; s2 += s1;
+		s1 += input[2]; s2 += s1;
+		s1 += input[3]; s2 += s1;
+		s1 += input[4]; s2 += s1;
+		s1 += input[5]; s2 += s1;
+		s1 += input[6]; s2 += s1;
+		s1 += input[7]; s2 += s1;
+
+		length -= 8;
+		input += 8;
+
+		if (s1 >= BASE)
+			s1 -= BASE;
+		if (length % 0x8000 == 0)
+			s2 %= BASE;
+	}
+
+	assert(s1 < BASE);
+	assert(s2 < BASE);
+
+	m_s1 = (word16)s1;
+	m_s2 = (word16)s2;
+}
+
+void Adler32::TruncatedFinal(byte *hash, size_t size)
+{
+	ThrowIfInvalidTruncatedSize(size);
+
+	switch (size)
+	{
+	default:
+		hash[3] = byte(m_s1);
+	case 3:
+		hash[2] = byte(m_s1 >> 8);
+	case 2:
+		hash[1] = byte(m_s2);
+	case 1:
+		hash[0] = byte(m_s2 >> 8);
+	case 0:
+		;
+	}
+
+	Reset();
+}
+
+NAMESPACE_END
-- 
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