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#include "tbl-gen.h"
#include "sbuf.h"
#include "tbl-dbg.h"
#include "version.h"
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#if STDC_HEADERS || HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#include <fcntl.h>
#include <errno.h>
#if defined(_AIX)
#include <sys/select.h>
#else
#include <sys/types.h>
#endif
int debug = 0;
int strip = 0;
TBL* tbl;
char* progname;
char* tblfilename = "/home/oms2/oms2_u_02/wan/madecode/ICD.HCI53.tt";
int process (char* buffer, int bytes)
{
SBuf sb; /* use simple buffers for reading in (know sizes) */
GenBuf gb;
void* val;
unsigned long bytesDecoded;
SBufInstallData(&sb, buffer+strip, bytes-strip);
PutSBufInGenBuf(&sb, &gb);
DBGMinCode = debug? TDEINFO: TDEWARNING;
if (!TdeDecode(tbl, &gb, &bytesDecoded, DBGType, DBGSimple, DBGExc))
fprintf(stdout,"%s: !!! Decoding error occured after %d bytes.\n",
progname,(int)bytesDecoded);
fflush(stdout);
return (int) bytesDecoded+strip;
}
int readable(int fd)
{
int result;
fd_set fds;
struct timeval tim;
FD_ZERO(&fds);
FD_SET(fd,&fds);
tim.tv_sec = tim.tv_usec = 0;
result = select(fd+1,&fds,NULL,NULL,&tim);
return result;
}
int decode(int fd)
{
char buffer[40960], *pointer;
int bytes = 0;
int nr;
int result;
if (tblfilename)
{
tbl = LoadTblFile(tblfilename);
if (tbl == NULL)
{
fprintf(stderr,"%s: !!! Can't load ASN.1 grammar table '%s'.\n",
progname,tblfilename);
exit(2);
}
tblfilename = NULL;
}
while(1)
{
if (bytes==0 || readable(fd))
{
nr = read(fd,buffer+bytes,sizeof(buffer)-bytes);
if (nr<0)
{
perror("!!! read failed");
return(2);
}
bytes += nr;
if (bytes==0)
break;
}
result = process(buffer,bytes);
if (result<=strip)
{
while (readable(fd))
{
nr = read(fd,buffer,sizeof(buffer));
if (nr<0)
{
perror("!!! read failed");
return(2);
}
if (nr==0)
return 0;
}
bytes = 0;
continue;
}
bytes -= result;
if (bytes<0)
{
fprintf(stdout,"%s: !!! Decoded past end of buffer.\n",progname);
fflush(stdout);
bytes = 0;
}
if (bytes)
memmove(buffer,buffer+result,bytes);
}
return(0);
}
int decodefn (char* filename)
{
if (!strcmp(filename,"-"))
decode(0);
else
{
int fd = open(filename,O_RDONLY);
if (fd<0)
{
perror(filename);
return 2;
}
decode(fd);
close(fd);
}
}
int main (int argc, char* argv[])
{
int status = 0;
int files = 0;
progname = argv[0];
InitNibbleMem(1024,1024);
while (--argc)
{
++argv;
if (!strcmp(*argv,"-s")
|| !strcmp(*argv,"-strip"))
{
strip = strtol(*++argv,NULL,0);
argc--;
}
else if (!strcmp(*argv,"-d")
|| !strcmp(*argv,"-debug"))
{
debug = 1;
}
else if (!strcmp(*argv,"-T")
|| !strcmp(*argv,"-table"))
{
if (!tblfilename)
{
fprintf(stderr,"%s: Give <tblfilename> before all filenames.\n",
progname);
return 1;
}
else
{
tblfilename = *++argv;
argc--;
}
}
else
{
files++;
status += decodefn(*argv);
}
}
if (!files)
{
fprintf(stderr,"Usage: %s [-s|-strip <bytestostrip>] [-d|-debug]\n",
progname);
fprintf(stderr," [-T|-table <tablefilename>] {<filename>|-}\n");
fprintf(stderr,"\n");
fprintf(stderr,"This is berdecode, revision %s as of %s.\n",
VERSION, RELDATE);
fprintf(stderr,"This program reads a binary ASN.1 grammar file generated by snacc -T\n");
fprintf(stderr,"and uses it to decode ASN.1 BER encoded data from files or stdin.\n");
fprintf(stderr,"\n");
fprintf(stderr,"From every message the first <bytestostrip> bytes (default 0)\n");
fprintf(stderr,"are skipped.\n");
fprintf(stderr,"\n");
fprintf(stderr,"Flag -d gives additional information during decoding.\n");
status = 1;
}
return status;
}
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