zoneminder/src/zm_utils.cpp

//
// ZoneMinder General Utility Functions, $Date$, $Revision$
// Copyright (C) 2001-2008 Philip Coombes
// 
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
// 

//#include "zm_logger.h"
#include "zm.h"
#include "zm_utils.h"

#include <string.h>
#include <stdio.h>
#include <stdarg.h>

unsigned int sseversion = 0;

const std::string stringtf( const char *format, ... )
{
    va_list ap;
    char tempBuffer[8192];
    std::string tempString;

    va_start(ap, format );
    vsnprintf( tempBuffer, sizeof(tempBuffer), format , ap );
    va_end(ap);

    tempString = tempBuffer;

    return( tempString );
}

const std::string stringtf( const std::string &format, ... )
{
    va_list ap;
    char tempBuffer[8192];
    std::string tempString;

    va_start(ap, format );
    vsnprintf( tempBuffer, sizeof(tempBuffer), format.c_str() , ap );
    va_end(ap);

    tempString = tempBuffer;

    return( tempString );
}

bool startsWith( const std::string &haystack, const std::string &needle )
{
    return( haystack.substr( 0, needle.length() ) == needle );
}

StringVector split( const std::string &string, const std::string chars, int limit )
{
    StringVector stringVector;
    std::string tempString = string;
    std::string::size_type startIndex = 0;
    std::string::size_type endIndex = 0;

    //Info( "Looking for '%s' in '%s', limit %d", chars.c_str(), string.c_str(), limit );
    do
    {
        // Find delimiters
        endIndex = string.find_first_of( chars, startIndex );
        //Info( "Got endIndex at %d", endIndex );
        if ( endIndex > 0 )
        {
            //Info( "Adding '%s'", string.substr( startIndex, endIndex-startIndex ).c_str() );
            stringVector.push_back( string.substr( startIndex, endIndex-startIndex ) );
        }
        if ( endIndex == std::string::npos )
            break;
        // Find non-delimiters
        startIndex = tempString.find_first_not_of( chars, endIndex );
        if ( limit && (stringVector.size() == (unsigned int)(limit-1)) )
        {
            stringVector.push_back( string.substr( startIndex ) );
            break;
        }
        //Info( "Got new startIndex at %d", startIndex );
    } while ( startIndex != std::string::npos );
    //Info( "Finished with %d strings", stringVector.size() );

    return( stringVector );
}

const std::string base64Encode( const std::string &inString )
{
	static char base64_table[64] = { '\0' };

	if ( !base64_table[0] )
	{
		int i = 0;
		for ( char c = 'A'; c <= 'Z'; c++ )
			base64_table[i++] = c;
		for ( char c = 'a'; c <= 'z'; c++ )
			base64_table[i++] = c;
		for ( char c = '0'; c <= '9'; c++ )
			base64_table[i++] = c;
		base64_table[i++] = '+';
		base64_table[i++] = '/';
	}

    std::string outString;
    outString.reserve( 2 * inString.size() );

	const char *inPtr = inString.c_str();
	while( *inPtr )
	{
		unsigned char selection = *inPtr >> 2;
		unsigned char remainder = (*inPtr++ & 0x03) << 4;
		outString += base64_table[selection];

		if ( *inPtr )
		{
			selection = remainder | (*inPtr >> 4);
			remainder = (*inPtr++ & 0x0f) << 2;
			outString += base64_table[selection];
		
			if ( *inPtr )
			{
				selection = remainder | (*inPtr >> 6);
				outString += base64_table[selection];
				selection = (*inPtr++ & 0x3f);
				outString += base64_table[selection];
			}
			else
			{
				outString += base64_table[remainder];
				outString += '=';
			}
		}
		else
		{
			outString += base64_table[remainder];
			outString += '=';
			outString += '=';
		}
	}
    return( outString );
}

/* Sets sse_version  */
void ssedetect() {
#if (defined(__i386__) || defined(__x86_64__))
	/* x86 or x86-64 processor */
	uint32_t r_edx, r_ecx;
	
	__asm__ __volatile__(
	"mov $0x1,%%eax\n\t"
	"cpuid\n\t"
	: "=d" (r_edx), "=c" (r_ecx)
	:
	: "%eax", "%ebx"
	);
	
	if (r_ecx & 0x00000200) {
		sseversion = 35; /* SSSE3 */
		Debug(1,"Detected a x86\\x86-64 processor with SSSE3");
	} else if (r_ecx & 0x00000001) {
		sseversion = 30; /* SSE3 */
		Debug(1,"Detected a x86\\x86-64 processor with SSE3");
	} else if (r_edx & 0x04000000) {
		sseversion = 20; /* SSE2 */
		Debug(1,"Detected a x86\\x86-64 processor with SSE2");
	} else if (r_edx & 0x02000000) {
		sseversion = 10; /* SSE */
		Debug(1,"Detected a x86\\x86-64 processor with SSE");
	} else {
		sseversion = 0;
		Debug(1,"Detected a x86\\x86-64 processor");
	}
	
#else
	/* Non x86 or x86-64 processor, SSE2 is not available */
	Debug(1,"Detected a non x86\\x86-64 processor");
	sseversion = 0;
#endif
}

/* SSE2 aligned memory copy. Useful for big copying of aligned memory like image buffers in ZM */
/* For platforms without SSE2 we will use standard x86 asm memcpy or glibc's memcpy() */
__attribute__((noinline,__target__("sse2"))) void* sse2_aligned_memcpy(void* dest, const void* src, size_t bytes) {
#if ((defined(__i386__) || defined(__x86_64__) || defined(ZM_KEEP_SSE)) && !defined(ZM_STRIP_SSE))
	if(bytes > 128) {
		unsigned int remainder = bytes % 128;
		const uint8_t* lastsrc = (uint8_t*)src + (bytes - remainder);

		__asm__ __volatile__(
		"sse2_copy_iter:\n\t"
		"movdqa (%0),%%xmm0\n\t"
		"movdqa 0x10(%0),%%xmm1\n\t"
		"movdqa 0x20(%0),%%xmm2\n\t"    
		"movdqa 0x30(%0),%%xmm3\n\t"
		"movdqa 0x40(%0),%%xmm4\n\t"
		"movdqa 0x50(%0),%%xmm5\n\t"
		"movdqa 0x60(%0),%%xmm6\n\t"
		"movdqa 0x70(%0),%%xmm7\n\t"
		"movntdq %%xmm0,(%1)\n\t"
		"movntdq %%xmm1,0x10(%1)\n\t"
		"movntdq %%xmm2,0x20(%1)\n\t"
		"movntdq %%xmm3,0x30(%1)\n\t"
		"movntdq %%xmm4,0x40(%1)\n\t"
		"movntdq %%xmm5,0x50(%1)\n\t"
		"movntdq %%xmm6,0x60(%1)\n\t"
		"movntdq %%xmm7,0x70(%1)\n\t"
		"add $0x80, %0\n\t"
		"add $0x80, %1\n\t"
		"cmp %2, %0\n\t"
		"jb sse2_copy_iter\n\t"
		"test %3, %3\n\t"
		"jz sse2_copy_finish\n\t"
		"cld\n\t"
		"rep movsb\n\t"
		"sse2_copy_finish:\n\t"
		:
		: "S" (src), "D" (dest), "r" (lastsrc), "c" (remainder)
		: "%xmm0", "%xmm1", "%xmm2", "%xmm3", "%xmm4", "%xmm5", "%xmm6", "%xmm7", "cc", "memory"
		);

	} else {
		/* Standard memcpy */
		__asm__ __volatile__("cld; rep movsb" :: "S"(src), "D"(dest), "c"(bytes) : "cc", "memory");
	}
#else
	/* Non x86\x86-64 platform, use memcpy */
	memcpy(dest,src,bytes);
#endif
	return dest;
}

void timespec_diff(struct timespec *start, struct timespec *end, struct timespec *diff) {
	if (((end->tv_nsec)-(start->tv_nsec))<0) {
		diff->tv_sec = end->tv_sec-start->tv_sec-1;
		diff->tv_nsec = 1000000000+end->tv_nsec-start->tv_nsec;
	} else {
		diff->tv_sec = end->tv_sec-start->tv_sec;
		diff->tv_nsec = end->tv_nsec-start->tv_nsec;
	}
}