From 3438e5d3ddf8444f0e31009ffbe8237ef3752c22 Mon Sep 17 00:00:00 2001 From: Alexander Harkness Date: Sun, 24 Nov 2013 14:21:13 +0000 Subject: move cryptopp into lib --- lib/cryptopp/adler32.cpp | 77 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 lib/cryptopp/adler32.cpp (limited to 'lib/cryptopp/adler32.cpp') diff --git a/lib/cryptopp/adler32.cpp b/lib/cryptopp/adler32.cpp new file mode 100644 index 000000000..0d52c0838 --- /dev/null +++ b/lib/cryptopp/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 -- cgit v1.2.3