add a stripping tool and a random key experiment

tools/correlation/strip/main.c

@@ -0,0 +1,83 @@
+#include <stdio.h>
+#include <string.h>
+#include <libgen.h>
+
+struct entry
+{
+    unsigned char msg[16];
+    unsigned char pad0;
+
+    unsigned char timing;
+    unsigned char pad1[2];
+} __attribute__ ((packed));
+
+int main(int argc, char *argv[])
+{
+    FILE *infile, *timingfile, *msgfile;
+    char fname[128], c1[128], c2[128], *path, *name;
+
+    strcpy(c1, argv[1]);
+    strcpy(c2, argv[1]);
+
+    int count = 0;
+    unsigned long read;
+    struct entry e;
+
+    if(argc != 2)
+    {
+        printf("usage: strip [fname]\n");
+        return -1;
+    }
+
+    path = dirname(c1);
+    name = basename(c2);
+
+    infile = fopen(argv[1], "rb");
+    if(infile == NULL)
+    {
+        printf("failed to open file %s\n", argv[1]);
+        return -1;
+    }
+
+    sprintf(fname, "%s/timing_%s", path, name);
+    timingfile = fopen(fname, "wb");
+    if(timingfile == NULL)
+    {
+        printf("failed to open timing output\n");
+        return -1;
+    }
+
+    sprintf(fname, "%s/msg_%s", path, name);
+    msgfile = fopen(fname, "wb");
+    if(msgfile == NULL)
+    {
+        printf("failed to open message output\n");
+        return -1;
+    }
+
+    while(!(ferror(infile) || feof(infile)))
+    {
+        read = fread(&e, sizeof(struct entry), 1, infile);
+        if(read != 1)
+            break;
+
+        fwrite(&e.timing, 1, 1, timingfile);
+        if(count % (1024 * 256) == 0)
+        {
+            fwrite(&e.msg, 16, 1, msgfile);
+            printf("stripped %i entries\n", count);
+        }
+
+        count++;
+    }
+
+    printf("strip finished with ferror %i feof %i\n", ferror(infile), feof(infile));
+
+    fflush(timingfile);
+    fflush(msgfile);
+
+    fclose(infile);
+    fclose(timingfile);
+    fclose(msgfile);
+    return 0;
+}