int
Scan_File(char *inpathname, Index *ind, Pathstore *store, int discardDups)
{
// Save the pathname in the store
char *pathname = Pathstore_path(store, inpathname,discardDups);
if (pathname == NULL) {
numdups++;
DPRINTF('s',("Scan_Pathname discard dup (%s)\n", inpathname));
return 0;
}
numfiles++;
DPRINTF('s', ("Scan_Pathname(%s)\n", pathname));
int fd = Fileops_open(pathname);
if (fd < 0) {
fprintf(stderr, "Can't open pathname %s\n", pathname);
return -1;
}
int size = 0;
int inum = Fileops_getinumber(fd, &size);
printf("Size: %d\n", size);
if(inum < 0) {Fileops_close(fd); return 0; }
unsigned char buf[DISKIMG_SECTOR_SIZE];
int blockNo = Fileops_getblockno(fd);
int bytesMoved = Fileops_getblock(inum, blockNo, buf);
int ch = Fileops_getchar(fd, inum, size, buf, &bytesMoved);
numchars++;
while (!(ch < 0)) { // Process words until we reach the end of the file
while (!isalpha(ch)) { // Skip any leading non-alpha characters
ch = Fileops_getchar(fd, inum, size, buf, &bytesMoved);
if (ch < 0) {Fileops_close(fd); return 0; }
numchars++;
}
// Found a word - record it in the index.
int offset = Fileops_tell(fd);
int pos = 0;
// read off the word until we hit the end of the word buffer
// or the end of the file or we hit an non-alpah characters
char word[MAX_WORD_SIZE+1];
while ((pos < MAX_WORD_SIZE) && !(ch < 0) && isalpha(ch)) {
word[pos++] = ch;
ch = Fileops_getchar(fd, inum, size, buf, &bytesMoved);
numchars++;
}
numwords++;
word[pos] = 0; // terminate string
bool ok = Index_StoreEntry(ind, word, pathname, offset);
assert(ok);
}
Fileops_close(fd);
return 0;
}
/*
* Implement the Unix read system call. Number of bytes returned. Return -1 on
* err.
*/
int
Fileops_read(int fd, char *buffer, int length)
{
int i;
int ch;
int size = 0;
numreads++;
int inumber = Fileops_getinumber(fd, &size);
printf ("Size: %d\n", size);
if(inumber < 0) return 0;
int blockNo = Fileops_getblockno(fd);
unsigned char buf[DISKIMG_SECTOR_SIZE];
int bytesMoved = Fileops_getblock(inumber, blockNo, buf);
for (i = 0; i < length; i++) {
ch = Fileops_getchar(fd, inumber, size, buf, &bytesMoved);
if (ch == -1) break;
buffer[i] = ch;
}
return i;
}
/*
* Implement the Unix read system call. Number of bytes returned. Return -1 on
* err.
*/
int
Fileops_read(int fd, char *buffer, int length)
{
int i;
int ch;
numreads++;
for (i = 0; i < length; i++) {
ch = Fileops_getchar(fd);
if (ch == -1) break;
buffer[i] = ch;
}
return i;
}
/*
* Do the two pathnames refer to a file with the same contents.
*/
static int
IsSameFile(Pathstore *store, char *pathname1, char *pathname2)
{
char chksum1[CHKSUMFILE_SIZE],
chksum2[CHKSUMFILE_SIZE];
struct unixfilesystem *fs = (struct unixfilesystem *) (store->fshandle);
numcompares++;
if (strcmp(pathname1, pathname2) == 0) {
return 1; // Same pathname must be same file.
}
/* Compute the chksumfile of each file to see if they are the same */
int err = chksumfile_bypathname(fs, pathname1, chksum1);
if (err < 0) {
fprintf(stderr,"Can't checksum path %s\n", pathname1);
return 0;
}
err = chksumfile_bypathname(fs, pathname2, chksum2);
if (err < 0) {
fprintf(stderr,"Can't checksum path %s\n", pathname2);
return 0;
}
if (chksumfile_compare(chksum1, chksum2) == 0) {
numdiffchecksum++;
return 0; // Checksum mismatch, not the same file
}
/* Checksums match, do a content comparison */
int fd1 = Fileops_open(pathname1);
if (fd1 < 0) {
fprintf(stderr, "Can't open path %s\n", pathname1);
return 0;
}
int fd2 = Fileops_open(pathname2);
if (fd2 < 0) {
Fileops_close(fd1);
fprintf(stderr, "Can't open path %s\n", pathname2);
return 0;
}
int ch1, ch2;
do {
ch1 = Fileops_getchar(fd1);
ch2 = Fileops_getchar(fd2);
if (ch1 != ch2) {
break; // Mismatch - exit loop with ch1 != ch2
}
} while (ch1 != -1);
// if files match then ch1 == ch2 == -1
Fileops_close(fd1);
Fileops_close(fd2);
if (ch1 == ch2) {
numsamefiles++;
} else {
numdifferentfiles++;
}
return ch1 == ch2;
}