static void chksum_and_xwrite(int fd, struct tar_header_t* hp)
{
/* POSIX says that checksum is done on unsigned bytes
* (Sun and HP-UX gets it wrong... more details in
* GNU tar source) */
const unsigned char *cp;
int chksum, size;
strcpy(hp->magic, "ustar ");
/* Calculate and store the checksum (i.e., the sum of all of the bytes of
* the header). The checksum field must be filled with blanks for the
* calculation. The checksum field is formatted differently from the
* other fields: it has 6 digits, a null, then a space -- rather than
* digits, followed by a null like the other fields... */
memset(hp->chksum, ' ', sizeof(hp->chksum));
cp = (const unsigned char *) hp;
chksum = 0;
size = sizeof(*hp);
do { chksum += *cp++; } while (--size);
putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum);
/* Now write the header out to disk */
xwrite(fd, hp, sizeof(*hp));
}
/*
* Write a tar header for the specified file name and status.
* It is assumed that the file name fits.
*/
static void
writeHeader(const char * fileName, const struct stat * statbuf)
{
long checkSum;
const unsigned char * cp;
int len;
TarHeader header;
/*
* Zero the header block in preparation for filling it in.
*/
memset((char *) &header, 0, sizeof(header));
/*
* Fill in the header.
*/
strcpy(header.name, fileName);
strncpy(header.magic, TAR_MAGIC, sizeof(header.magic));
strncpy(header.version, TAR_VERSION, sizeof(header.version));
putOctal(header.mode, sizeof(header.mode), statbuf->st_mode & 0777);
putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
putOctal(header.size, sizeof(header.size), statbuf->st_size);
putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
header.typeFlag = TAR_TYPE_REGULAR;
/*
* Calculate and store the checksum.
* This is the sum of all of the bytes of the header,
* with the checksum field itself treated as blanks.
*/
memset(header.checkSum, ' ', sizeof(header.checkSum));
cp = (const unsigned char *) &header;
len = sizeof(header);
checkSum = 0;
while (len-- > 0)
checkSum += *cp++;
putOctal(header.checkSum, sizeof(header.checkSum), checkSum);
/*
* Write the tar header.
*/
writeTarBlock((const char *) &header, sizeof(header));
}
num_put<Pt::Char, ostreambuf_iterator<Pt::Char> >::iter_type
num_put<Pt::Char, ostreambuf_iterator<Pt::Char> >::do_put(iter_type s, ios_base& f, char_type fill, unsigned long long val) const
{
// TODO: grouping
//const numpunct<char>& np = use_facet<numpunct<char> >(f.getloc());
//const string& grouping = np.grouping();
switch (f.flags() & ios_base::basefield)
{
case ios_base::oct:
putOctal(s, val, f.flags(), f.width(0), fill);
break;
case ios_base::hex:
putHex(s, val, f.flags(), f.width(0), fill);
break;
default:
putDecimal(s, val, f.flags(), f.width(0), fill);
break;
}
return s;
}
/* Write out a tar header for the specified file/directory/whatever */
static inline int writeTarHeader(struct TarBallInfo *tbInfo,
const char *header_name,
const char *real_name, struct stat *statbuf)
{
long chksum = 0;
struct TarHeader header;
const unsigned char *cp = (const unsigned char *) &header;
ssize_t size = sizeof(struct TarHeader);
memset(&header, 0, size);
strncpy(header.name, header_name, sizeof(header.name));
putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
strncpy(header.magic, TAR_MAGIC TAR_VERSION,
TAR_MAGIC_LEN + TAR_VERSION_LEN);
/* Enter the user and group names (default to root if it fails) */
if (my_getpwuid(header.uname, statbuf->st_uid) == NULL)
strcpy(header.uname, "root");
if (my_getgrgid(header.gname, statbuf->st_gid) == NULL)
strcpy(header.gname, "root");
if (tbInfo->hlInfo) {
/* This is a hard link */
header.typeflag = LNKTYPE;
strncpy(header.linkname, tbInfo->hlInfo->name,
sizeof(header.linkname));
} else if (S_ISLNK(statbuf->st_mode)) {
char *lpath = xreadlink(real_name);
if (!lpath) /* Already printed err msg inside xreadlink() */
return (FALSE);
header.typeflag = SYMTYPE;
strncpy(header.linkname, lpath, sizeof(header.linkname));
free(lpath);
} else if (S_ISDIR(statbuf->st_mode)) {
header.typeflag = DIRTYPE;
strncat(header.name, "/", sizeof(header.name));
} else if (S_ISCHR(statbuf->st_mode)) {
header.typeflag = CHRTYPE;
putOctal(header.devmajor, sizeof(header.devmajor),
MAJOR(statbuf->st_rdev));
putOctal(header.devminor, sizeof(header.devminor),
MINOR(statbuf->st_rdev));
} else if (S_ISBLK(statbuf->st_mode)) {
header.typeflag = BLKTYPE;
putOctal(header.devmajor, sizeof(header.devmajor),
MAJOR(statbuf->st_rdev));
putOctal(header.devminor, sizeof(header.devminor),
MINOR(statbuf->st_rdev));
} else if (S_ISFIFO(statbuf->st_mode)) {
header.typeflag = FIFOTYPE;
} else if (S_ISREG(statbuf->st_mode)) {
header.typeflag = REGTYPE;
putOctal(header.size, sizeof(header.size), statbuf->st_size);
} else {
bb_error_msg("%s: Unknown file type", real_name);
return (FALSE);
}
/* Calculate and store the checksum (i.e., the sum of all of the bytes of
* the header). The checksum field must be filled with blanks for the
* calculation. The checksum field is formatted differently from the
* other fields: it has [6] digits, a null, then a space -- rather than
* digits, followed by a null like the other fields... */
memset(header.chksum, ' ', sizeof(header.chksum));
cp = (const unsigned char *) &header;
while (size-- > 0)
chksum += *cp++;
putOctal(header.chksum, 7, chksum);
/* Now write the header out to disk */
if ((size =
bb_full_write(tbInfo->tarFd, (char *) &header,
sizeof(struct TarHeader))) < 0) {
bb_error_msg(bb_msg_io_error, real_name);
return (FALSE);
}
/* Pad the header up to the tar block size */
for (; size < TAR_BLOCK_SIZE; size++) {
write(tbInfo->tarFd, "\0", 1);
}
/* Now do the verbose thing (or not) */
if (tbInfo->verboseFlag) {
FILE *vbFd = stdout;
if (tbInfo->tarFd == STDOUT_FILENO) /* If the archive goes to stdout, verbose to stderr */
vbFd = stderr;
fprintf(vbFd, "%s\n", header.name);
}
return (TRUE);
}
