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OS/2 Shareware BBS: 10 Tools
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dispsrch.zip
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DISPSIG.C
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C/C++ Source or Header
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1994-03-25
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5KB
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249 lines
/* Quick program to copy a named signature to a small file */
#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <string.h>
#include "perfhlib.h"
/* statics */
byte buf[100];
int numKeys; /* Number of hash table entries (keys) */
int numVert; /* Number of vertices in the graph (also size of g[]) */
int PatLen; /* Size of the keys (pattern length) */
int SymLen; /* Max size of the symbols, including null */
FILE *f; /* File being read */
FILE *f2; /* File being written */
static word *T1base, *T2base; /* Pointers to start of T1, T2 */
static word *g; /* g[] */
/* prototypes */
void grab(int n);
word readFileShort(void);
void cleanup(void);
#define SYMLEN 16
#define PATLEN 23
/* Hash table structure */
typedef struct HT_tag
{
char htSym[SYMLEN];
byte htPat[PATLEN];
} HT;
HT ht; /* One hash table entry */
void
main(int argc, char *argv[])
{
word w, len;
int i;
if (argc <= 3)
{
printf("Usage: dispsig <SigFilename> <FunctionName> <BinFileName>\n");
printf("Example: dispsig dccm8s.sig printf printf.bin\n");
exit(1);
}
if ((f = fopen(argv[1], "rb")) == NULL)
{
printf("Cannot open %s\n", argv[1]);
exit(2);
}
if ((f2 = fopen(argv[3], "wb")) == NULL)
{
printf("Cannot write to %s\n", argv[3]);
exit(2);
}
/* Read the parameters */
grab(4);
if (memcmp("dccs", buf, 4) != 0)
{
printf("Not a dccs file!\n");
exit(3);
}
numKeys = readFileShort();
numVert = readFileShort();
PatLen = readFileShort();
SymLen = readFileShort();
/* Initialise the perfhlib stuff. Also allocates T1, T2, g, etc */
hashParams( /* Set the parameters for the hash table */
numKeys, /* The number of symbols */
PatLen, /* The length of the pattern to be hashed */
256, /* The character set of the pattern (0-FF) */
0, /* Minimum pattern character value */
numVert); /* Specifies C, the sparseness of the graph.
See Czech, Havas and Majewski for details
*/
T1base = readT1();
T2base = readT2();
g = readG();
/* Read T1 and T2 tables */
grab(2);
if (memcmp("T1", buf, 2) != 0)
{
printf("Expected 'T1'\n");
exit(3);
}
len = PatLen * 256 * sizeof(word);
w = readFileShort();
if (w != len)
{
printf("Problem with size of T1: file %d, calc %d\n", w, len);
exit(4);
}
if (fread(T1base, 1, len, f) != len)
{
printf("Could not read T1\n");
exit(5);
}
grab(2);
if (memcmp("T2", buf, 2) != 0)
{
printf("Expected 'T2'\n");
exit(3);
}
w = readFileShort();
if (w != len)
{
printf("Problem with size of T2: file %d, calc %d\n", w, len);
exit(4);
}
if (fread(T2base, 1, len, f) != len)
{
printf("Could not read T2\n");
exit(5);
}
/* Now read the function g[] */
grab(2);
if (memcmp("gg", buf, 2) != 0)
{
printf("Expected 'gg'\n");
exit(3);
}
len = numVert * sizeof(word);
w = readFileShort();
if (w != len)
{
printf("Problem with size of g[]: file %d, calc %d\n", w, len);
exit(4);
}
if (fread(g, 1, len, f) != len)
{
printf("Could not read T2\n");
exit(5);
}
/* This is now the hash table */
grab(2);
if (memcmp("ht", buf, 2) != 0)
{
printf("Expected 'ht'\n");
exit(3);
}
w = readFileShort();
if (w != numKeys * (SymLen + PatLen + sizeof(word)))
{
printf("Problem with size of hash table: file %d, calc %d\n", w, len);
exit(6);
}
for (i=0; i < numKeys; i++)
{
if (fread(&ht, 1, SymLen + PatLen, f) != (size_t)(SymLen + PatLen))
{
printf("Could not read pattern %d from %s\n", i, argv[1]);
exit(7);
}
if (stricmp(ht.htSym, argv[2]) == 0)
{
/* Found it! */
break;
}
}
fclose(f);
if (i == numKeys)
{
printf("Function %s not found!\n", argv[2]);
exit(2);
}
printf("Function %s index %d\n", ht.htSym, i);
for (i=0; i < PatLen; i++)
{
printf("%02X ", ht.htPat[i]);
}
fwrite(ht.htPat, 1, PatLen, f2);
fclose(f2);
printf("\n");
}
void
cleanup(void)
{
/* Free the storage for variable sized tables etc */
if (T1base) free(T1base);
if (T2base) free(T2base);
if (g) free(g);
}
void grab(int n)
{
if (fread(buf, 1, n, f) != (size_t)n)
{
printf("Could not read\n");
exit(11);
}
}
word
readFileShort(void)
{
byte b1, b2;
if (fread(&b1, 1, 1, f) != 1)
{
printf("Could not read\n");
exit(11);
}
if (fread(&b2, 1, 1, f) != 1)
{
printf("Could not read\n");
exit(11);
}
return (b2 << 8) + b1;
}
/* Following two functions not needed unless creating tables */
void getKey(int i, byte **keys)
{
}
/* Display key i */
void
dispKey(int i)
{
}