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QRZ! Ham Radio 16
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QRZ_16.iso
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utils
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lookup.c
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C/C++ Source or Header
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1996-06-23
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8KB
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352 lines
/*
* lookup.c
*
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <memory.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <assert.h>
#ifdef unix
#include <unistd.h>
/* #include <strerror.h>*/
#define strnicmp strncasecmp
#else
#include <io.h>
#include <dir.h>
#endif
#include "rockridg.h"
#include "datadef.h"
#ifndef O_BINARY
#define O_BINARY 0
#endif
static void Read(int fd, void *buf, int n, int swap);
#if 0
static void _Read(int fd, void *buf, int n, int swap, int line, char *file);
#define Read(fd, buf, n, swap) _Read((fd), (buf), (n), (swap), __LINE__, __FILE__)
#endif
#ifdef unix
static const char datafile[] = "lookup.dat";
#else
static const char datafile[] = "/utils/lookup.dat";
#endif
char datafileroot[30];
static char word[256];
static struct file_header hdr;
static long rehash6;
static long rehash16;
static int fd;
static long
hash2(const unsigned char *s) {
unsigned long h, g, r;
int c;
int i;
r = h = ((long) s[0] << 16) + (s[1] << 8);
for (i = 0; s[i] != 0; ++i) {
h += ((long) s[i] << i) + s[i];
h ^= h >> i;
}
while ((c = *s++) != '\0') {
h <<= 4;
h += c;
g = h & 0xf0000000;
h ^= g;
h ^= (g >> 24);
r ^= h;
}
rehash6 = r % 61;
rehash16 = r % 65521;
return h % hdr.hash_prime;
}
static int
search_file(const char *filename) {
FILE *fp;
int rv;
static char line[257];
char *s;
int lc, uc, len;
/* fprintf(stderr, "searching file %s\n", filename); */
lc = *word;
if (islower(lc)) {
uc = lc + 'A' - 'a';
} else {
uc = lc;
}
len = strlen(word);
if ((fp = fopen(filename, "rt")) == NULL) {
fprintf(stderr, "Cannot open %s: %s\n", filename, strerror(errno));
return 0;
}
rv = 0;
while (fgets(line, 256, fp) != NULL) {
line[255] = '\n';
line[256] = '\0';
for (s = line; *s != 0; ++s) {
if (*s == lc || (*s == uc && isupper(*s))) {
if (strnicmp(s, word, len) == 0) {
++rv;
printf("%s: %s", filename, line);
break;
}
}
}
}
fclose(fp);
return rv;
}
static char *
lookup_dir(int n) {
static char path[1024];
unsigned char buf[300];
unsigned char *p;
short dir_num;
long x;
if (n == 0) {
#if unix
path[0] = '.';
path[1] = '\0';
#else
path[0] = '\0';
#endif
return path;
}
lseek(fd, hdr.dir_table_offset + n * sizeof(long), SEEK_SET);
Read(fd, &x, sizeof(x), 1);
lseek(fd, x, SEEK_SET);
Read(fd, buf, sizeof(buf), 0);
dir_num = buf[0] + (buf[1] << 8);
p = lookup_dir(dir_num);
strcat(p, "/");
strcat(p, buf + 2);
return p;
}
static char *
lookup_filename(long n) {
unsigned char buf[300];
unsigned char *p;
short dir_num;
lseek(fd, n, SEEK_SET);
Read(fd, buf, sizeof(buf), 0);
dir_num = buf[0] + (buf[1] << 8);
p = lookup_dir(dir_num);
strcat(p, "/");
strcat(p, buf + 2);
return p;
}
static int
search_block(int block) {
int rv, i;
long *p;
long b[2];
int nfiles;
/* fprintf(stderr, "searching_block( %d == %x )\n", block, block); */
if (lseek(fd, hdr.block_table_offset + block * 4, SEEK_SET) < 0) {
fprintf(stderr, "lseek <1> failed: %s\n", strerror(errno));
exit(1);
}
Read(fd, &b, sizeof(b), 1);
if (block == (hdr.num_blocks - 1)) {
nfiles = hdr.num_files - b[0];
assert(nfiles > 0);
} else {
nfiles = b[1] - b[0];
assert(nfiles > 0);
}
p = malloc(nfiles * sizeof(*p));
if (lseek(fd, hdr.file_table_offset + (b[0] * 4), SEEK_SET) < 0) {
fprintf(stderr, "lseek <2> failed: %s\n", strerror(errno));
exit(1);
}
assert(lseek(fd, 0L, SEEK_CUR) ==
hdr.file_table_offset + (b[0] * 4));
Read(fd, p, nfiles * 4, 1);
for (rv = i = 0; i < nfiles; ++i) {
#ifndef unix
char dir[3];
sprintf(dir, "%c:", getdisk() + 'A');
rv += search_file(get_real_filename(dir, lookup_filename(p[i])));
#else
rv += search_file(lookup_filename(p[i]));
#endif
}
free(p);
return rv;
}
static int
search(unsigned long x) {
int rv;
unsigned char p[512];
int i, j, n, b;
long offset;
rv = 0;
offset = x & 0xffffffL;
switch ((x >> 30) & 0x3) {
case 0:
lseek(fd, offset, SEEK_SET);
Read(fd, p, sizeof(p), 0);
for (i = 0; i < hdr.num_blocks; ++i) {
if (p[i/8] & (1 << (i % 8))) {
rv += search_block(i);
}
}
break;
case 1:
rv = search_block(x & 0xfff);
break;
case 2:
rv = search_block(x & 0xfff);
rv += search_block((x >> 12) & 0xfff);
break;
case 3:
lseek(fd, offset, SEEK_SET);
Read(fd, p, sizeof(p), 0);
j = 0;
n = p[j++];
n += ((p[j] & 0x0f) << 8);
for (i = 1; i < n + 1; ++i) {
if (i & 1) {
b = (p[j++] & 0xf0) >> 4;
b += p[j++] << 4;
} else {
b = p[j++];
b += (p[j] & 0x0f) << 8;
}
rv += search_block(b);
}
break;
}
return rv;
}
void
main(int argc, char **argv) {
unsigned int len;
unsigned int match;
unsigned long h;
unsigned long x;
unsigned short i;
if (argc != 2) {
fprintf(stderr,
"usage: lookup <word>\n"
" Search a CDROM for all files containing\n"
" the specified word.\n");
exit(1);
}
strcpy(word, argv[1]);
len = strlen(word);
for (i = 0; i < len; ++i) {
if (isupper(word[i])) {
word[i] = tolower(word[i]);
}
}
strcpy(datafileroot, "utils/");
if ((fd = open("utils/lookup.dat", O_RDONLY|O_BINARY)) < 0) {
fprintf(stderr, "Cannot open %s: %s.\n",
"utils/lookup.dat", strerror(errno));
fprintf(stderr,
"Cd to the root directory of the cdrom and try again.\n");
exit(1);
}
Read(fd, &hdr, sizeof(hdr), 1);
assert(hdr.header_size == sizeof(hdr));
assert(hdr.filesize == lseek(fd, 0L, SEEK_END));
h = hash2(word);
match = 0;
for (i = 0;; ++i) {
lseek(fd, (h * 4) + hdr.hash_table_offset, SEEK_SET);
Read(fd, &x, sizeof(x), 1);
if (x == 0) {
break;
}
if (((x >> 30) == 1 && ((x >> 12) & 0xffff) == rehash16) ||
((x >> 30) != 1 && ((x >> 24) & 0x003f) == rehash6)) {
match = search(x);
break;
}
h = (h + rehash6 + i) % hdr.hash_prime;
}
if (match == 0) {
printf("sorry, no match\n");
}
exit(match == 0);
}
static void
Read(int fd, void *buf, int n, int swap) {
assert(n > 0);
assert(swap == 0 || (n & 3) == 0);
if (read(fd, buf, n) < 0) {
fprintf(stderr, "read failed: %s\n", strerror(errno));
exit(1);
}
#ifdef sparc
if (swap) {
int i;
unsigned char c;
unsigned char *p;
p = buf;
for (i = 0; i < n; i += 4) {
c = p[i];
p[i] = p[i + 3];
p[i + 3] = c;
c = p[i + 1];
p[i + 1] = p[i + 2];
p[i + 2] = c;
}
}
#endif
return;
}
#if defined(sparc) && ! defined(__svr4__)
const char *
strerror(error)
int error;
{
static char defaultMsg[32];
extern int sys_nerr;
extern char *sys_errlist[];
if ((error < sys_nerr) && (error > 0)) {
return sys_errlist[error];
}
(void) sprintf(defaultMsg, "unknown error (%d)", error);
return defaultMsg;
}
#endif