cet::MD5Result Struct Reference

#include <MD5Digest.h>

Public Member Functions
	MD5Result ()
std::string	toString () const
std::string	compactForm () const
void	fromHexifiedString (std::string const &s)
bool	isValid () const

Public Attributes
unsigned char	bytes [16]

Detailed Description

Definition at line 17 of file MD5Digest.h.

Constructor & Destructor Documentation

cet::MD5Result::MD5Result

(

)

Definition at line 42 of file MD5Digest.cc.

{ set_to_default(*this); }

Member Function Documentation

std::string cet::MD5Result::compactForm

(

)

const

Definition at line 68 of file MD5Digest.cc.

  {
    // This is somewhat dangerous, because the conversion of 'unsigned
    // char' to 'char' may be undefined if 'char' is a signed type
    // (4.7p3 in the Standard).
    const char* p = reinterpret_cast<const char*>(&bytes[0]);
    return std::string(p, p + sizeof(bytes));
  }

void cet::MD5Result::fromHexifiedString

(

std::string const &

s

)

Definition at line 78 of file MD5Digest.cc.

  {
    switch (hexy.size()) {
    case 0: {
      set_to_default(*this);
    } break;
    case 32: {
      std::string const chars = cet::nybbler(hexy).as_char();
      std::string::const_iterator it = chars.begin();
      for (size_t i = 0; i != 16; ++i)
        bytes[i] = *it++;
    } break;
    default: {
      throw "String of illegal length given to MD5Result::fromHexifiedString";
    }
    }
  }

bool cet::MD5Result::isValid

(

)

const

Definition at line 97 of file MD5Digest.cc.

  {
    return (*this != invalidResult());
  }

std::string cet::MD5Result::toString

(

)

const

Definition at line 45 of file MD5Digest.cc.

  {
    // Note: The code used to be this:
    //
    // std::ostringstream os;
    // os << std::hex << std::setfill('0');
    // for (size_t i = 0; i < sizeof(bytes); ++i)
    //   os << std::setw(2) << static_cast<int>(bytes[i]);
    // return os.str();
    //
    // However profiling shows that this causes a measurable slowdown.
    // The following code does the same thing, but is much faster.
    constexpr char hex_bytes[] = "0123456789abcdef";
    std::string ret;
    ret.resize(sizeof(bytes) << 1);
    for (size_t i = 0; i < sizeof(bytes); ++i) {
      ret[i << 1] = hex_bytes[bytes[i] >> 4];
      ret[(i << 1) + 1] = hex_bytes[bytes[i] & 0x0F];
    }
    return ret;
  }

Member Data Documentation

unsigned char cet::MD5Result::bytes[16]

Definition at line 24 of file MD5Digest.h.

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The documentation for this struct was generated from the following files:

• cetlib/cetlib/MD5Digest.h
• cetlib/cetlib/MD5Digest.cc