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/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2014 Kitware, Inc., Insight Software Consortium
Distributed under the OSI-approved BSD License (the "License");
see accompanying file Copyright.txt for details.
This software is distributed WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the License for more information.
============================================================================*/
#include "cmUuid.h"
#include <string.h>
#include <cmsys/MD5.h>
#include "cm_sha2.h"
cmUuid::cmUuid()
{
Groups.push_back(4);
Groups.push_back(2);
Groups.push_back(2);
Groups.push_back(2);
Groups.push_back(6);
}
std::string cmUuid::FromMd5(std::vector<unsigned char> const& uuidNamespace,
std::string const& name) const
{
std::vector<unsigned char> hashInput;
this->CreateHashInput(uuidNamespace, name, hashInput);
cmsysMD5_s *md5 = cmsysMD5_New();
cmsysMD5_Initialize(md5);
cmsysMD5_Append(md5, &hashInput[0], int(hashInput.size()));
unsigned char digest[16] = {0};
cmsysMD5_Finalize(md5, digest);
cmsysMD5_Delete(md5);
return this->FromDigest(digest, 3);
}
std::string cmUuid::FromSha1(std::vector<unsigned char> const& uuidNamespace,
std::string const& name) const
{
std::vector<unsigned char> hashInput;
this->CreateHashInput(uuidNamespace, name, hashInput);
SHA_CTX *sha = new SHA_CTX;
SHA1_Init(sha);
SHA1_Update(sha, &hashInput[0], hashInput.size());
unsigned char digest[SHA1_DIGEST_LENGTH] = {0};
SHA1_Final(digest, sha);
delete sha;
return this->FromDigest(digest, 5);
}
void cmUuid::CreateHashInput(std::vector<unsigned char> const& uuidNamespace,
std::string const& name, std::vector<unsigned char> &output) const
{
output = uuidNamespace;
if(name.size())
{
output.resize(output.size() + name.size());
memcpy(&output[0] + uuidNamespace.size(),
name.c_str(), name.size());
}
}
std::string cmUuid::FromDigest(
const unsigned char* digest, unsigned char version) const
{
typedef unsigned char byte_t;
byte_t uuid[16] = {0};
memcpy(uuid, digest, 16);
uuid[6] &= 0xF;
uuid[6] |= byte_t(version << 4);
uuid[8] &= 0x3F;
uuid[8] |= 0x80;
return this->BinaryToString(uuid);
}
bool cmUuid::StringToBinary(std::string const& input,
std::vector<unsigned char> &output) const
{
output.clear();
output.reserve(16);
if(input.length() != 36)
{
return false;
}
size_t index = 0;
for(size_t i = 0; i < this->Groups.size(); ++i)
{
if(i != 0 && input[index++] != '-')
{
return false;
}
size_t digits = this->Groups[i] * 2;
if(!StringToBinaryImpl(input.substr(index, digits), output))
{
return false;
}
index += digits;
}
return true;
}
std::string cmUuid::BinaryToString(const unsigned char* input) const
{
std::string output;
size_t inputIndex = 0;
for(size_t i = 0; i < this->Groups.size(); ++i)
{
if(i != 0)
{
output += '-';
}
size_t bytes = this->Groups[i];
for(size_t j = 0; j < bytes; ++j)
{
unsigned char byte = input[inputIndex++];
output += this->ByteToHex(byte);
}
}
return output;
}
std::string cmUuid::ByteToHex(unsigned char byte) const
{
std::string result;
for(int i = 0; i < 2; ++i)
{
unsigned char rest = byte % 16;
byte /= 16;
char c = (rest < 0xA) ?
char('0' + rest) :
char('a' + (rest - 0xA));
result = c + result;
}
return result;
}
bool cmUuid::StringToBinaryImpl(std::string const& input,
std::vector<unsigned char> &output) const
{
if(input.size()%2)
{
return false;
}
for(size_t i = 0; i < input.size(); i +=2)
{
char c1 = 0;
if(!IntFromHexDigit(input[i], c1))
{
return false;
}
char c2 = 0;
if(!IntFromHexDigit(input[i + 1], c2))
{
return false;
}
output.push_back(char(c1 << 4 | c2));
}
return true;
}
bool cmUuid::IntFromHexDigit(char input, char& output) const
{
if(input >= '0' && input <= '9')
{
output = char(input - '0');
return true;
}
else if(input >= 'a' && input <= 'f')
{
output = char(input - 'a' + 0xA);
return true;
}
else if(input >= 'A' && input <= 'F')
{
output = char(input - 'A' + 0xA);
return true;
}
else
{
return false;
}
}
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