asn1c linux使用方法,asn1c工具使用
解压： tar -zxvfasn1c-0.9.24.tar.gz
依次按照configure,make，make install的步骤编译、安装
出现这个问题：
test -z "/usr/local/share/asn1c"|| /bin/mkdir -p "/usr/local/share/asn1c"
/bin/mkdir: cannot create directory`/usr/local/share/asn1c': Permission denied
make[3]: *** [install-dist_pkgdataDATA]Error 1
make[3]: Leaving directory`/home/liuguili/asn1ctemp/asn1c-0.9.24/skeletons'
make[2]: *** [install-am] Error 2
make[2]: Leaving directory`/home/liuguili/asn1ctemp/asn1c-0.9.24/skeletons'
make[1]: *** [install-recursive] Error 1
make[1]: Leaving directory`/home/liuguili/asn1ctemp/asn1c-0.9.24/skeletons'
make: *** [install-recursive] Error 1
用sudo make install即可
采用用户手册上的一个例子
liuguili@ubuntu:~/asn1ctemp/test$ vimrectangle.asn1
rectangle.asn1:
RectangleModule1DEFINITIONS ::=
BEGIN
Rectangle ::=SEQUENCE {
height INTEGER,
width INTEGER
}
END
执行命令
asn1c -fnative-types rectangle.asn1
生成一堆编码用的.c,.h
编码清单：
#include
#include
#include
static int write_out(const void *buffer,size_t size, void *app_key)
{
FILE *out_fp = app_key;
size_t wrote;
wrote = fwrite(buffer, 1, size, out_fp);
return (wrote == size)?0:-1;
}
int main(int ac, char **av)
{
Rectangle_t *rectangle;
asn_enc_rval_t ec;
rectangle = calloc(1, sizeof(Rectangle_t));
if(!rectangle)
{
perror("callocfailed");
exit(71);
}
rectangle->height = 42;
rectangle->width = 23;
const char *filename = "Test";
FILE *fp = fopen(filename, "wb");
if(!fp)
{
perror("filename");
exit(71);
}
ec = xer_encode(&asn_DEF_Rectangle, rectangle,XER_F_CANONICAL,write_out, fp);
fclose(fp);
if(ec.encoded == -1)
{
perror("Count not encodeRectangle.\n");
exit(65);
}
else
{
printf("Created with BERencoded Rectangle.\n");
}
xer_fprint(stdout, &asn_DEF_Rectangle, rectangle);
return 0;
}
liuguili@ubuntu:~/asn1ctemp/test$ gcc -I.-o rencode *.c
执行文件：
liuguili@ubuntu:~/asn1ctemp/test$ ./encode
Created with BER encoded Rectangle.
42
23
出现一个非常搞笑的事情，本来代码要生成一个Test文件，我编译完成未执行就去找Test，结果没找到，我还纳闷了半天。
解码清单：
#include
#include
#include
int main(int ac, char **av)
{
Char buf[1024];/*Temporarybuffer */
Rectangle_t*rectangle=0;/*Typetodecode*/
asn_dec_rval_t rval;/*Decoderreturnvalue*/
FILE*fp;/*Inputfilehandler*/
size_t size;/*Numberofbytesread*/
char*filename;/*Inputfilename*/
/*Requireasinglefilenameargument*/
if(ac!=2)
{
fprintf(stderr,”Usage:%s\n”,av[0]);
exit(64);/*better,EX_USAGE*/
}
else
{
filename=av[1];
}
/*Openinputfileasread-onlybinary*/
fp=fopen(filename,”rb”);
if(!fp)
{
perror(filename);
exit(66);/*better,EX_NOINPUT*/
} /*Readuptothebuffersize*/
size=fread(buf,1,sizeof(buf),fp);
fclose(fp);
if(!size)
{
fprintf(stderr,”%s:Emptyorbroken\n”,filename);
exit(65);/*better,EX_DATAERR*/
}
/*DecodetheinputbufferasRectangletype*/
rval=ber_decode(0,&asn_DEF_Rectangle,(void**)&rectangle,buf,size);
if(rval.code!=RC_OK)
{
fprintf(stderr,”%s:BrokenRectangleencodingatbyte%ld\n”,filename,(long)rval.consumed);
exit(65);/*better,EX_DATAERR*/
}
/*PrintthedecodedRectangletypeasXML*/
xer_fprint(stdout,&asn_DEF_Rectangle,rectangle);
return 0;/*Decodingfinishedsuccessfully*/
}
编译出现问题：
liuguili@ubuntu:~/asn1ctemp/test$ gcc -I.-o dencode *.c
main.c: In function ‘main’:
main.c:37:77: error: stray ‘\342’ inprogram
main.c:37:77: error: stray ‘\200’ inprogram
出现此问题的原因是，源代码中存在汉语字符，如“”等，将其改过来即可~
代码参考asn1c用户手册：