Определение порядка байтов во время компиляции

Question

Определение порядка байтов во время компиляции

public static String getMd5OfFile(String filePath)
{
    String returnVal = "";
    try 
    {
        InputStream   input   = new FileInputStream(filePath); 
        byte[]        buffer  = new byte[1024];
        MessageDigest md5Hash = MessageDigest.getInstance("MD5");
        int           numRead = 0;
        while (numRead != -1)
        {
            numRead = input.read(buffer);
            if (numRead > 0)
            {
                md5Hash.update(buffer, 0, numRead);
            }
        }
        input.close();

        byte [] md5Bytes = md5Hash.digest();
        for (int i=0; i < md5Bytes.length; i++)
        {
            returnVal += Integer.toString( ( md5Bytes[i] & 0xff ) + 0x100, 16).substring( 1 );
        }
    } 
    catch(Throwable t) {t.printStackTrace();}
    return returnVal.toUpperCase();
}

59

c endianness

задан Ryan Haining 2 May 2018 в 23:01

1 ответ

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c endianness

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score 0 · Answer 1

Я взял его из rapidjson библиотеки:

#define BYTEORDER_LITTLE_ENDIAN 0 // Little endian machine.
#define BYTEORDER_BIG_ENDIAN 1 // Big endian machine.

//#define BYTEORDER_ENDIAN BYTEORDER_LITTLE_ENDIAN

#ifndef BYTEORDER_ENDIAN
    // Detect with GCC 4.6's macro.
#   if defined(__BYTE_ORDER__)
#       if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
#           define BYTEORDER_ENDIAN BYTEORDER_LITTLE_ENDIAN
#       elif (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
#           define BYTEORDER_ENDIAN BYTEORDER_BIG_ENDIAN
#       else
#           error "Unknown machine byteorder endianness detected. User needs to define BYTEORDER_ENDIAN."
#       endif
    // Detect with GLIBC's endian.h.
#   elif defined(__GLIBC__)
#       include <endian.h>
#       if (__BYTE_ORDER == __LITTLE_ENDIAN)
#           define BYTEORDER_ENDIAN BYTEORDER_LITTLE_ENDIAN
#       elif (__BYTE_ORDER == __BIG_ENDIAN)
#           define BYTEORDER_ENDIAN BYTEORDER_BIG_ENDIAN
#       else
#           error "Unknown machine byteorder endianness detected. User needs to define BYTEORDER_ENDIAN."
#       endif
    // Detect with _LITTLE_ENDIAN and _BIG_ENDIAN macro.
#   elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN)
#       define BYTEORDER_ENDIAN BYTEORDER_LITTLE_ENDIAN
#   elif defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN)
#       define BYTEORDER_ENDIAN BYTEORDER_BIG_ENDIAN
    // Detect with architecture macros.
#   elif defined(__sparc) || defined(__sparc__) || defined(_POWER) || defined(__powerpc__) || defined(__ppc__) || defined(__hpux) || defined(__hppa) || defined(_MIPSEB) || defined(_POWER) || defined(__s390__)
#       define BYTEORDER_ENDIAN BYTEORDER_BIG_ENDIAN
#   elif defined(__i386__) || defined(__alpha__) || defined(__ia64) || defined(__ia64__) || defined(_M_IX86) || defined(_M_IA64) || defined(_M_ALPHA) || defined(__amd64) || defined(__amd64__) || defined(_M_AMD64) || defined(__x86_64) || defined(__x86_64__) || defined(_M_X64) || defined(__bfin__)
#       define BYTEORDER_ENDIAN BYTEORDER_LITTLE_ENDIAN
#   elif defined(_MSC_VER) && (defined(_M_ARM) || defined(_M_ARM64))
#       define BYTEORDER_ENDIAN BYTEORDER_LITTLE_ENDIAN
#   else
#       error "Unknown machine byteorder endianness detected. User needs to define BYTEORDER_ENDIAN."
#   endif
#endif