dmsdos-0.9.2.2 addeddmsdos-0.9.2.2

1 files changed, 120 insertions, 0 deletions

diff --git a/src/cvftest.c b/src/cvftest.c
new file mode 100644
index 0000000..ede517c
--- /dev/null
+++ b/src/cvftest.c
@@ -0,0 +1,120 @@
+/*
+cvftest.c
+
+DMSDOS: doublespace/drivespace/stacker CVF identification tool.
+
+******************************************************************************
+DMSDOS (compressed MSDOS filesystem support) for Linux
+written 1995-1998 by Frank Gockel and Pavel Pisa
+
+    (C) Copyright 1995-1998 by Frank Gockel
+    (C) Copyright 1996-1998 by Pavel Pisa
+
+Some code of dmsdos has been copied from the msdos filesystem
+so there are the following additional copyrights:
+
+    (C) Copyright 1992,1993 by Werner Almesberger (msdos filesystem)
+    (C) Copyright 1994,1995 by Jacques Gelinas (mmap code)
+    (C) Copyright 1992-1995 by Linus Torvalds
+
+DMSDOS was inspired by the THS filesystem (a simple doublespace
+DS-0-2 compressed read-only filesystem) written 1994 by Thomas Scheuermann.
+
+The DMSDOS code is distributed under the Gnu General Public Licence.
+See file COPYING for details.
+******************************************************************************
+
+*/
+
+#include<stdio.h>
+#include<string.h>
+
+int main(int argc, char*argv[])
+{ unsigned char sb[512];
+  int i;
+  FILE*f;
+  char*fn;
+  
+  if(argc<2||argc>3)
+  { 
+   usage:
+    fprintf(stderr,"usage: %s filename [-v]\n",argv[0]);
+    fprintf(stderr,"detect CVFs according to header\n");
+    fprintf(stderr,"  -v: be verbose i.e. print result to stdout\n");
+    fprintf(stderr,"  \"-\" as filename means read data from stdin\n");
+    fprintf(stderr,"exit code: 0 = CVF detected, 1 = no CVF, >1 = some error occured\n"); 
+    exit(20);
+  }
+  
+  fn=argv[1];
+  
+  if(argc==3)
+  { if(strcmp(argv[1],"-v")==0)fn=argv[2];
+    else if(strcmp(argv[2],"-v")!=0)goto usage;
+  }
+  
+  if(strcmp(fn,"-")==0)f=stdin;
+  else 
+  { f=fopen(fn,"rb");  
+    if(f==NULL)
+    { perror("open failed");
+      exit(4);
+    }
+  }
+  
+  for(i=0;i<512;++i)sb[i]=fgetc(f);
+  
+  if(fgetc(f)==EOF)
+  { if(ferror(f))
+    { perror("error reading file");
+      exit(3);
+    }
+    if(argc==3)goto nocvf;
+    return 1;
+  }
+  
+  if(argc==2)
+  {  
+  if(strncmp(sb+3,"MSDBL6.0",8)==0||strncmp(sb+3,"MSDSP6.0",8)==0
+     ||strncmp(sb,"STACKER",7)==0)return 0;
+     
+  return 1;
+  }
+  
+  if(strncmp(sb+3,"MSDBL6.0",8)==0||strncmp(sb+3,"MSDSP6.0",8)==0)
+  { if(sb[51]==2&&sb[13]==16)printf("drivespace CVF (version 2)\n");
+    else if((sb[51]==3||sb[51]==0)&&sb[13]==64)printf("drivespace 3 CVF\n");
+    else if(sb[51]<2&&sb[13]==16)printf("doublespace CVF (version 1)\n");
+    else printf("unknown (new? damaged?) doublespace or drivespace CVF\n");
+    return 0;
+  }
+  else if(strncmp(sb,"STACKER",7)==0)
+  { int i;
+    unsigned char b,c;
+    unsigned char * p;
+    int StacVersion;
+  
+    /* decode super block */
+    for(i=0x30,p=sb+0x50,b=sb[0x4c];i--;p++)
+    { b=0xc4-b;
+      b=b<0x80?b*2:b*2+1;
+      b^=c=*p;
+      *p=b;b=c;
+    }
+    if(sb[0x4e]!=0xa||sb[0x4f]!=0x1a)
+      printf("unknown (new? damaged?) stacker CVF\n");
+    else
+    { StacVersion=sb[0x60];
+      StacVersion&=0xff;
+      StacVersion|=sb[0x61]<<8;
+      StacVersion&=0xffff;
+      if(StacVersion>=410)printf("stacker version 4 CVF\n");
+      else printf("stacker version 3 CVF\n");
+    }
+    return 0;
+  }
+  
+ nocvf:
+  printf("not a known CVF\n");
+  return 1;
+}