int
nileDiff(FILE *oldfile, FILE *newfile, FILE *output, enum Options options) {
int rv = 1;
off_t oldoff = 0, newoff = 0, lastSkip = 0;
size_t oldsize, newsize;
char *olddata = NULL, *newdata = NULL, md5sum[MD5_DIGEST_LENGTH] = { 0 }, header[8];
if((oldsize = mapfile(oldfile, &olddata)) == -1)
rv = 1;
else if((newsize = mapfile(newfile, &newdata)) == -1)
rv = 1;
fputs(MAGIC, output);
// newfile: uncompress and build md5sum
if((newfile = uncompress(newfile, output, options)) == NULL)
goto diff_cleanup;
buildhash(md5sum, newfile);
fwrite(md5sum, sizeof(md5sum), 1, output);
// oldfile: uncompress and build md5sum
if((oldfile = uncompress(oldfile, NULL, options)) == NULL)
goto diff_cleanup;
buildhash(md5sum, oldfile);
fwrite(md5sum, sizeof(md5sum), 1, output);
// Building Diff
for(oldoff = newoff = 0; oldoff < oldsize && newoff < newsize;) {
if(lcs(olddata, &oldoff, oldsize, newdata, &newoff, newsize, &lastSkip, output)) break;
}
// write trailing diff
offtout(lastSkip, header);
fwrite(header, sizeof(header), 1, output);
offtout(oldsize - oldoff, header);
fwrite(header, sizeof(header), 1, output);
offtout(newsize - newoff, header);
fwrite(header, sizeof(header), 1, output);
fwrite(&newdata[newoff], newsize - newoff, 1, output);
diff_cleanup:
if(oldsize >= 0)
munmap(olddata, oldsize);
if(newsize >= 0)
munmap(newdata, newsize);
return rv;
}
int main(int argc, char **argv)
{
printf("begining...\n");
clock_t t1, t2, begin, end;
begin = clock();
int pkeylen = datalen[0];
int *pkeydata = (int*)malloc(sizeof(int) * pkeylen);
assert(pkeydata);
int fkeylen = datalen[1];
int *fkeydata = (int*)malloc(sizeof(int) * fkeylen);
assert(pkeydata);
loaddata(filenames, 0, pkeylen, pkeydata);
loaddata(filenames, 1, fkeylen, fkeydata);
int *hashtable = (int*)malloc(sizeof(int) * TABLESIZE);
memset(hashtable, 0, sizeof(int) * TABLESIZE);
assert(hashtable);
printf("building hashtable...\n");
t1 = clock();
buildhash(pkeydata, hashtable, pkeylen);
t2 = clock();
printf("build hashtable time = %f\n", (double)(t2 - t1) / CLOCKS_PER_SEC);
printf("probing...\n");
t1 = clock();
probe(hashtable, fkeydata, fkeylen);
t2 = clock();
printf("probing time = %f\n", (double)(t2 - t1) / CLOCKS_PER_SEC);
end = clock();
printf("total time = %f\n", (double)(end - begin) / CLOCKS_PER_SEC);
free(hashtable);
free(fkeydata);
free(pkeydata);
}