91 lines
2.7 KiB
C++
91 lines
2.7 KiB
C++
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/*============================================================================
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CMake - Cross Platform Makefile Generator
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Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
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Distributed under the OSI-approved BSD License (the "License");
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see accompanying file Copyright.txt for details.
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This software is distributed WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the License for more information.
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============================================================================*/
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#include "cmCryptoHash.h"
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#include <cmsys/MD5.h>
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//----------------------------------------------------------------------------
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std::string cmCryptoHash::HashString(const char* input)
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{
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this->Initialize();
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this->Append(reinterpret_cast<unsigned char const*>(input),
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static_cast<int>(strlen(input)));
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return this->Finalize();
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}
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//----------------------------------------------------------------------------
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std::string cmCryptoHash::HashFile(const char* file)
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{
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std::ifstream fin(file, std::ios::in | cmsys_ios_binary);
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if(!fin)
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{
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return "";
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}
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this->Initialize();
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// Should be efficient enough on most system:
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const int bufferSize = 4096;
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char buffer[bufferSize];
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unsigned char const* buffer_uc =
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reinterpret_cast<unsigned char const*>(buffer);
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// This copy loop is very sensitive on certain platforms with
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// slightly broken stream libraries (like HPUX). Normally, it is
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// incorrect to not check the error condition on the fin.read()
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// before using the data, but the fin.gcount() will be zero if an
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// error occurred. Therefore, the loop should be safe everywhere.
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while(fin)
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{
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fin.read(buffer, bufferSize);
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if(int gcount = static_cast<int>(fin.gcount()))
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{
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this->Append(buffer_uc, gcount);
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}
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}
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if(fin.eof())
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{
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return this->Finalize();
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}
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return "";
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}
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//----------------------------------------------------------------------------
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cmCryptoHashMD5::cmCryptoHashMD5(): MD5(cmsysMD5_New())
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{
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}
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//----------------------------------------------------------------------------
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cmCryptoHashMD5::~cmCryptoHashMD5()
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{
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cmsysMD5_Delete(this->MD5);
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}
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//----------------------------------------------------------------------------
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void cmCryptoHashMD5::Initialize()
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{
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cmsysMD5_Initialize(this->MD5);
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}
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//----------------------------------------------------------------------------
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void cmCryptoHashMD5::Append(unsigned char const* buf, int sz)
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{
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cmsysMD5_Append(this->MD5, buf, sz);
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}
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//----------------------------------------------------------------------------
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std::string cmCryptoHashMD5::Finalize()
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{
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char md5out[32];
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cmsysMD5_FinalizeHex(this->MD5, md5out);
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return std::string(md5out, 32);
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}
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