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Java display-properties lines-intersection-2D quit-event usefull-libs fast file read C/C++ build-parse-basic tcp-send-recv |
(currently only in english)
Build and parse simple data types (return number of bytes processed)#include <string.h>
int build_int1(void *buf,int s,unsigned char v){
if (s<1) return -1;
((unsigned char*)buf)[0]=v;
return 1;
}
int build_int2(void *buf,int s,unsigned short v){
if (s<2) return -1;
((unsigned char*)buf)[0]=v>>8;
((unsigned char*)buf)[1]=v;
return 2;
}
int build_int4(void *buf,int s,unsigned long v){
unsigned char i;
if (s<4) return -1;
for (i=0; i<4; v>>=8,++i)
((unsigned char*)buf)[3-i]=v;
return 4;
}
int build_string(void *buf,int s,const char *str,unsigned short l){
if (s<2+l) return -1;
build_int2(buf,s,l);
memcpy(buf+2,str,l);
return l+2;
}
int parse_int1(void *buf,int s,unsigned char *v){
if (s<1) return -1;
*v=((unsigned char*)buf)[0];
return 1;
}
int parse_int2(void *buf,int s,unsigned short *v){
if (s<2) return -1;
*v=((unsigned char*)buf)[0]<<8;
*v|=((unsigned char*)buf)[1];
return 2;
}
int parse_int4(void *buf,int s,unsigned long *v){
unsigned char i;
if (s<4) return -1;
for (*v=0,i=0; i<4; ++i)
{*v<<=8;*v|=((unsigned char*)buf)[i];}
return 4;
}
int parse_string(void *buf,int s,char *str,unsigned short *sl){
unsigned short l;
if (parse_int2(buf,s,&l)<0) return -1;
if (s<2+l) return -1;
if (*sl>l) *sl=l;
memcpy(str,buf+2,*sl);
return l+2;
}
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