lxdcmutil.cpp.svn-base

dicom 文件读写

#include "LXDcmUtil.hpp"
#include <string.h>
#include <stdio.h>
#include <time.h>
#include <process.h>

#define SITE_INSTANCE_UID_ROOT                  SITE_UID_ROOT ".1.4"

#ifdef HAVE_STATIC_CAST
#define LXstatic_cast(x,y) (static_cast< x >(y))
#else
#define LXstatic_cast(x,y) ((x)(y))
#endif

static unsigned long hostIdentifier = 0;
static unsigned int counterOfCurrentUID = 1;
static const int maxUIDLen = 64;    /* A UID may be 64 chars or less */

static long gethostid(void) 
{
	return 1473669170;//just for test 
}

inline static unsigned long
forcePositive(long i)
{
	return (i < 0) ? LXstatic_cast(unsigned long, -i) : LXstatic_cast(unsigned long, i);
}


static char* stripTrailing(char* s, char c)
{
	int i, n;

	if (s == NULL) return s;

	n = strlen(s);
	for (i = n - 1; (i >= 0) && (s[i] == c); i--)
		s[i] = '\0';
	return s;
}

static void addUIDComponent(char* uid, const char* s)
{
	int charsLeft = maxUIDLen - strlen(uid);

	if (charsLeft > 0) {
		/* copy into uid as much of the contents of s as possible */
		int slen = strlen(s);
		int use = charsLeft;
		if (slen < charsLeft) use = slen;
		strncat(uid, s, use);
	}

	stripTrailing(uid, '.');
}

CLXDcmUtil::CLXDcmUtil()
{

}

char* CLXDcmUtil::GenerateUniqueIdentifier( char* uid, const char* prefix/*=NULL*/ )
{
	char buf[128]; /* be very safe */

	uid[0] = '\0'; /* initialise */

	if (hostIdentifier == 0)
		hostIdentifier = LXstatic_cast(unsigned long, gethostid());
	unsigned int counter = counterOfCurrentUID++;


	if (prefix != NULL ) 
	{
		addUIDComponent(uid, prefix);
	}
	else
	{
		addUIDComponent(uid, SITE_INSTANCE_UID_ROOT);
	}

	sprintf(buf, ".%lu", hostIdentifier);
	addUIDComponent(uid, buf);

	sprintf(buf, ".%lu", forcePositive(getpid()));
	addUIDComponent(uid, buf);

	sprintf(buf, ".%lu", forcePositive(LXstatic_cast(long, time(NULL))));
	addUIDComponent(uid, buf);
	sprintf(buf, ".%u", counter);
	addUIDComponent(uid, buf);

	return uid;
}