/*

The MIT License (MIT)

Copyright (c) 2014 Graeme Hill (http://graemehill.ca)

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.

*/

#include "guid.h"

#ifdef GUID_LIBUUID

#include <uuid/uuid.h>

#endif

#ifdef GUID_CFUUID

#include <CoreFoundation/CFUUID.h>

#endif

#ifdef GUID_WINDOWS

#include <objbase.h>

#endif

#ifdef GUID_ANDROID

#include <jni.h>

#endif

using namespace std;

// overload << so that it's easy to convert to a string

ostream &operator<<(ostream &s, const TSKGuid &guid)

{

  return s << hex << setfill('0')

    << setw(2) << (int)guid._bytes[0]

    << setw(2) << (int)guid._bytes[1]

    << setw(2) << (int)guid._bytes[2]

    << setw(2) << (int)guid._bytes[3]

    << "-"

    << setw(2) << (int)guid._bytes[4]

    << setw(2) << (int)guid._bytes[5]

    << "-"

    << setw(2) << (int)guid._bytes[6]

    << setw(2) << (int)guid._bytes[7]

    << "-"

    << setw(2) << (int)guid._bytes[8]

    << setw(2) << (int)guid._bytes[9]

    << "-"

    << setw(2) << (int)guid._bytes[10]

    << setw(2) << (int)guid._bytes[11]

    << setw(2) << (int)guid._bytes[12]

    << setw(2) << (int)guid._bytes[13]

    << setw(2) << (int)guid._bytes[14]

    << setw(2) << (int)guid._bytes[15];

}

// create a guid from vector of bytes

TSKGuid::TSKGuid(const vector<unsigned char> &bytes)

{

  _bytes = bytes;

}

// create a guid from array of bytes

TSKGuid::TSKGuid(const unsigned char *bytes)

{

  _bytes.assign(bytes, bytes + 16);

}

// converts a single hex char to a number (0 - 15)

unsigned char hexDigitToChar(char ch)

{

  if (ch > 47 && ch < 58)

    return ch - 48;

  if (ch > 96 && ch < 103)

    return ch - 87;

  if (ch > 64 && ch < 71)

    return ch - 55;

  return 0;

}

// converts the two hexadecimal characters to an unsigned char (a byte)

unsigned char hexPairToChar(char a, char b)

{

  return hexDigitToChar(a) * 16 + hexDigitToChar(b);

}

// create a guid from string

TSKGuid::TSKGuid(const string &fromString)

{

  _bytes.clear();

  char charOne, charTwo;

  bool lookingForFirstChar = true;

  // for (const char &ch : fromString) C++ 11 CODE CHANGED FOR TSK

  for (std::string::const_iterator it = fromString.begin(); it != fromString.end(); ++it)

  {

    char ch = *it;

    if (ch == '-')

      continue;

    if (lookingForFirstChar)

    {

      charOne = ch;

      lookingForFirstChar = false;

    }

    else

    {

      charTwo = ch;

      unsigned char byte = hexPairToChar(charOne, charTwo);

      _bytes.push_back(byte);

      lookingForFirstChar = true;

    }

  }

}

// create empty guid

TSKGuid::TSKGuid()

{

  _bytes = vector<unsigned char>(16, 0);

}

// copy constructor

TSKGuid::TSKGuid(const TSKGuid &other)

{

  _bytes = other._bytes;

}

std::string TSKGuid::str() const {

  std::stringstream ss;

  ss << (*this);

  return ss.str();

}

// overload assignment operator

TSKGuid &TSKGuid::operator=(const TSKGuid &other)

{

  _bytes = other._bytes;

  return *this;

}

// overload equality operator

bool TSKGuid::operator==(const TSKGuid &other) const

{

  return _bytes == other._bytes;

}

// overload inequality operator

bool TSKGuid::operator!=(const TSKGuid &other) const

{

  return !((*this) == other);

}

// This is the linux friendly implementation, but it could work on other

// systems that have libuuid available

#ifdef GUID_LIBUUID

TSKGuid GuidGenerator::newGuid()

{

  uuid_t id;

  uuid_generate(id);

  return id;

}

#endif

// this is the mac and ios version

#ifdef GUID_CFUUID

TSKGuid GuidGenerator::newGuid()

{

  CFUUIDRef newId = CFUUIDCreate(NULL);

  CFUUIDBytes bytes = CFUUIDGetUUIDBytes(newId);

  CFRelease(newId);

  const unsigned char byteArray[16] =

  {

    bytes.byte0,

    bytes.byte1,

    bytes.byte2,

    bytes.byte3,

    bytes.byte4,

    bytes.byte5,

    bytes.byte6,

    bytes.byte7,

    bytes.byte8,

    bytes.byte9,

    bytes.byte10,

    bytes.byte11,

    bytes.byte12,

    bytes.byte13,

    bytes.byte14,

    bytes.byte15

  };

  return byteArray;

}

#endif

// obviously this is the windows version

#ifdef GUID_WINDOWS

TSKGuid GuidGenerator::newGuid()

{

  GUID newId;

  CoCreateGuid(&newId);

  const unsigned char bytes[16] =

  {

    (unsigned char)((newId.Data1 >> 24) & 0xFF),

    (unsigned char)((newId.Data1 >> 16) & 0xFF),

    (unsigned char)((newId.Data1 >> 8) & 0xFF),

    (unsigned char)((newId.Data1) & 0xff),

    (unsigned char)((newId.Data2 >> 8) & 0xFF),

    (unsigned char)((newId.Data2) & 0xff),

    (unsigned char)((newId.Data3 >> 8) & 0xFF),

    (unsigned char)((newId.Data3) & 0xFF),

    newId.Data4[0],

    newId.Data4[1],

    newId.Data4[2],

    newId.Data4[3],

    newId.Data4[4],

    newId.Data4[5],

    newId.Data4[6],

    newId.Data4[7]

  };

  return bytes;

}

#endif

// android version that uses a call to a java api

#ifdef GUID_ANDROID

GuidGenerator::GuidGenerator(JNIEnv *env)

{

  _env = env;

  _uuidClass = env->FindClass("java/util/UUID");

  _newGuidMethod = env->GetStaticMethodID(_uuidClass, "randomUUID", "()Ljava/util/UUID;");

  _mostSignificantBitsMethod = env->GetMethodID(_uuidClass, "getMostSignificantBits", "()J");

  _leastSignificantBitsMethod = env->GetMethodID(_uuidClass, "getLeastSignificantBits", "()J");

}

TSKGuid GuidGenerator::newGuid()

{

  jobject javaUuid = _env->CallStaticObjectMethod(_uuidClass, _newGuidMethod);

  jlong mostSignificant = _env->CallLongMethod(javaUuid, _mostSignificantBitsMethod);

  jlong leastSignificant = _env->CallLongMethod(javaUuid, _leastSignificantBitsMethod);

  unsigned char bytes[16] =

  {

    (mostSignificant >> 56) & 0xFF,

    (mostSignificant >> 48) & 0xFF,

    (mostSignificant >> 40) & 0xFF,

    (mostSignificant >> 32) & 0xFF,

    (mostSignificant >> 24) & 0xFF,

    (mostSignificant >> 16) & 0xFF,

    (mostSignificant >> 8) & 0xFF,

    (mostSignificant) & 0xFF,

    (leastSignificant >> 56) & 0xFF,

    (leastSignificant >> 48) & 0xFF,

    (leastSignificant >> 40) & 0xFF,

    (leastSignificant >> 32) & 0xFF,

    (leastSignificant >> 24) & 0xFF,

    (leastSignificant >> 16) & 0xFF,

    (leastSignificant >> 8) & 0xFF,

    (leastSignificant) & 0xFF,

  };

  return bytes;

}

#endif