/*
jartool.c - main functions for fastjar utility
- Copyright (C) 2002 Free Software Foundation
+ Copyright (C) 2002, 2004 Free Software Foundation
Copyright (C) 1999, 2000, 2001 Bryan Burns
This program is free software; you can redistribute it and/or
#include "dostime.h"
#include "pushback.h"
#include "compress.h"
+#include "shift.h"
/* Some systems have mkdir that takes a single argument. */
#ifdef MKDIR_TAKES_ONE_ARG
int consume(pb_file *, int);
int list_jar(int, char**, int);
int extract_jar(int, char**, int);
-int add_file_to_jar(int, int, const char*, struct stat*);
-int add_to_jar(int, const char*);
-int add_to_jar_with_dir(int, const char*, const char*);
+int add_file_to_jar(int, int, const char*, struct stat*, int);
+int add_to_jar(int, const char*, int);
+int add_to_jar_with_dir(int, const char*, const char*, int);
int create_central_header(int);
-int make_manifest(int, const char*);
+int make_manifest(int, const char*, int);
+int read_entries (int);
static void init_args(char **, int);
static char *get_next_arg (void);
static char *jt_strdup (char*);
static void expand_options (int *argcp, char ***argvp);
+static inline struct zipentry *find_entry (const char *);
+static inline int looks_like_dir (const char *);
/* global variables */
ub1 file_header[30];
int number_of_entries; /* number of entries in the linked list */
+/* What we go by. */
+const char *progname;
+
+/* The offset of the end of the last zip entry. */
+ub4 end_of_entries;
+
/* This is used to mark options with no short value. */
#define LONG_OPT(Num) ((Num) + 128)
int new_argc;
char **new_argv;
+ progname = argv[0];
+
do_compress = TRUE;
verbose = FALSE;
new_argv[new_argc] = NULL;
if(action == ACTION_NONE){
- fprintf(stderr, "One of options -{ctxu} must be specified.\n");
+ fprintf(stderr, "%s: one of options -{ctxu} must be specified.\n",
+ progname);
usage(argv[0]);
}
- if(action == ACTION_UPDATE){
- fprintf(stderr, "%s: `-u' mode unimplemented.\n", argv[0]);
- exit(1);
- }
-
/* Verify unsupported combinations and warn of the use of non
standard features */
if(verbose && use_explicit_list_only)
fprintf (stderr, "Warning: using non standard '-@' option\n");
if(read_names_from_stdin
&& (action != ACTION_CREATE && action != ACTION_UPDATE)){
- fprintf(stderr, "Option '-@' is supported only with '-c' or '-u'.\n");
+ fprintf(stderr, "%s: option '-@' is supported only with '-c' or '-u'.\n",
+ progname);
usage(argv[0]);
}
jarfd = open(jarfile, O_CREAT | O_BINARY | O_WRONLY | O_TRUNC, 0666);
if(jarfd < 0){
- fprintf(stderr, "Error opening %s for writing!\n", jarfile);
- perror(jarfile);
+ fprintf(stderr, "%s: error opening %s for writing: %s\n", progname,
+ jarfile, strerror (errno));
exit(1);
}
jarfd = open(jarfile, O_RDONLY | O_BINARY);
if(jarfd < 0){
- fprintf(stderr, "Error opening %s for reading!\n", jarfile);
- perror(jarfile);
+ fprintf(stderr, "%s: error opening %s for reading: %s\n", progname,
+ jarfile, strerror (errno));
exit(1);
}
}
}
+ if (action == ACTION_UPDATE)
+ {
+ if (!jarfile)
+ {
+ fprintf (stderr, "%s: `-u' mode requires a file name\n",
+ argv[0]);
+ exit (1);
+ }
+
+ if ((jarfd = open (jarfile, O_RDWR | O_BINARY)) < 0)
+ {
+ fprintf (stderr, "Error opening %s for reading!\n", jarfile);
+ perror (jarfile);
+ exit (1);
+ }
+
+ /* Assert that jarfd is seekable. */
+ if (lseek (jarfd, 0, SEEK_CUR) == -1)
+ {
+ fprintf (stderr, "%s: %s is not seekable\n", argv[0], jarfile);
+ exit (1);
+ }
+
+ seekable = TRUE;
+ }
+
if(action == ACTION_CREATE || action == ACTION_UPDATE){
const char *arg;
init_headers();
- if((action == ACTION_UPDATE) && jarfile) {
- if((jarfd = open(jarfile, O_RDWR | O_BINARY)) < 0) {
- fprintf(stderr, "Error opening %s for reading!\n", jarfile);
- perror(jarfile);
- exit(1);
- }
- }
-
if(do_compress)
init_compression();
-
+
+ if (action == ACTION_UPDATE)
+ {
+ if (read_entries (jarfd))
+ exit (1);
+ }
/* Add the META-INF/ directory and the manifest */
if(manifest && mfile)
- make_manifest(jarfd, mfile);
- else if(manifest)
- make_manifest(jarfd, NULL);
-
+ make_manifest(jarfd, mfile, action == ACTION_UPDATE);
+ else if(manifest && action == ACTION_CREATE)
+ make_manifest(jarfd, NULL, FALSE);
+
init_args (new_argv, 0);
/* now we add the files to the archive */
while ((arg = get_next_arg ())){
const char *dir_to_change = get_next_arg ();
const char *file_to_add = get_next_arg ();
if (!dir_to_change || !file_to_add) {
- fprintf(stderr, "Error: missing argument for -C.\n");
- exit(1);
- }
- if (add_to_jar_with_dir(jarfd, dir_to_change, file_to_add)) {
- fprintf(stderr,
- "Error adding %s (in directory %s) to jar archive!\n",
- file_to_add, dir_to_change);
+ fprintf(stderr, "%s: error: missing argument for -C.\n", progname);
exit(1);
}
+ if (add_to_jar_with_dir(jarfd, dir_to_change, file_to_add,
+ action == ACTION_UPDATE))
+ {
+ fprintf(stderr,
+ "Error adding %s (in directory %s) to jar archive!\n",
+ file_to_add, dir_to_change);
+ exit(1);
+ }
} else {
- if(add_to_jar(jarfd, arg)){
+ if(add_to_jar(jarfd, arg, action == ACTION_UPDATE)){
fprintf(stderr, "Error adding %s to jar archive!\n", arg);
exit(1);
}
/* de-initialize the compression DS */
if(do_compress)
end_compression();
+
+ if (action == ACTION_UPDATE)
+ lseek (jarfd, end_of_entries, SEEK_SET);
create_central_header(jarfd);
-
- if (close(jarfd) != 0) {
- fprintf(stderr, "Error closing jar archive!\n");
+
+ /* Check if the file shrunk when we updated it. */
+ if (action == ACTION_UPDATE)
+ ftruncate (jarfd, lseek (jarfd, 0, SEEK_CUR));
+
+ if (jarfd != STDIN_FILENO && close(jarfd) != 0) {
+ fprintf(stderr, "%s: error closing jar archive: %s\n",
+ progname, strerror (errno));
+ exit (1);
}
} else if(action == ACTION_LIST){
list_jar(jarfd, &new_argv[0], new_argc);
number_of_entries++;
}
-int make_manifest(int jfd, const char *mf_name){
+static inline struct zipentry *
+find_entry (const char *fname)
+{
+ struct zipentry *ze;
+
+ for (ze = ziptail; ze; ze = ze->next_entry)
+ {
+ if (!strcmp (ze->filename, fname))
+ return ze;
+ }
+ return NULL;
+}
+
+
+static inline int
+looks_like_dir (const char *fname)
+{
+ struct zipentry *ze;
+ size_t len = strlen (fname);
+
+ for (ze = ziptail; ze; ze = ze->next_entry)
+ {
+ if (strlen (ze->filename) > len
+ && !strncmp (fname, ze->filename, len)
+ && ze->filename[len] == '/')
+ return 1;
+ }
+ return 0;
+}
+
+
+/*
+ * Read the zip entries of an existing file, building `ziplist' as we go.
+ */
+int read_entries (int fd)
+{
+ struct zipentry *ze;
+ ub1 intbuf[4];
+ ub1 header[46];
+ ub2 len;
+ ub2 count, i;
+ off_t offset;
+
+ if (lseek (fd, -22, SEEK_END) == -1)
+ {
+ fprintf (stderr, "%s: %s: can't seek file\n", progname, jarfile);
+ return 1;
+ }
+
+ if (read (fd, intbuf, 4) < 4)
+ {
+ perror (progname);
+ return 1;
+ }
+ /* Is there a zipfile comment? */
+ while (UNPACK_UB4(intbuf, 0) != 0x06054b50)
+ {
+ if (lseek (fd, -5, SEEK_CUR) == -1 ||
+ read (fd, intbuf, 4) != 4)
+ {
+ fprintf (stderr, "%s: can't find end of central directory: %s\n",
+ progname, strerror (errno));
+ return 1;
+ }
+ }
+
+ /* Skip disk numbers. */
+ if (lseek (fd, 6, SEEK_CUR) == -1)
+ {
+ perror (progname);
+ return 1;
+ }
+
+ /* Number of entries in the central directory. */
+ if (read (fd, intbuf, 2) != 2)
+ {
+ perror (progname);
+ return 1;
+ }
+ count = UNPACK_UB2(intbuf, 0);
+
+ if (lseek (fd, 4, SEEK_CUR) == -1)
+ {
+ perror (progname);
+ return 1;
+ }
+
+ /* Offset where the central directory begins. */
+ if (read (fd, intbuf, 4) != 4)
+ {
+ perror (progname);
+ return 1;
+ }
+ offset = UNPACK_UB4(intbuf, 0);
+ end_of_entries = offset;
+
+ if (lseek (fd, offset, SEEK_SET) != offset)
+ {
+ perror (progname);
+ return 1;
+ }
+
+ if (read (fd, header, 46) != 46)
+ {
+ fprintf (stderr, "%s: %s: unexpected end of file\n",
+ progname, jarfile);
+ return 1;
+ }
+
+ for (i = 0; i < count; i++)
+ {
+ if (UNPACK_UB4(header, 0) != 0x02014b50)
+ {
+ fprintf (stderr, "%s: can't find central directory header\n",
+ progname);
+ return 1;
+ }
+ ze = (struct zipentry *) malloc (sizeof (struct zipentry));
+ if (!ze)
+ {
+ perror (progname);
+ return 1;
+ }
+ memset (ze, 0, sizeof (struct zipentry));
+ ze->flags = UNPACK_UB2(header, CEN_FLAGS);
+ ze->mod_time = UNPACK_UB2(header, CEN_MODTIME);
+ ze->mod_date = UNPACK_UB2(header, CEN_MODDATE);
+ ze->crc = UNPACK_UB4(header, CEN_CRC);
+ ze->usize = UNPACK_UB4(header, CEN_USIZE);
+ ze->csize = UNPACK_UB4(header, CEN_CSIZE);
+ ze->offset = UNPACK_UB4(header, CEN_OFFSET);
+ ze->compressed = (header[CEN_COMP] || header[CEN_COMP+1]);
+ len = UNPACK_UB2(header, CEN_FNLEN);
+ ze->filename = (char *) malloc ((len+1) * sizeof (char));
+ if (!ze->filename)
+ {
+ perror (progname);
+ return 1;
+ }
+ if (read (fd, ze->filename, len) != len)
+ {
+ fprintf (stderr, "%s: %s: unexpected end of file\n",
+ progname, jarfile);
+ return 1;
+ }
+ len = UNPACK_UB4(header, CEN_EFLEN);
+ len += UNPACK_UB4(header, CEN_COMLEN);
+ if (lseek (fd, len, SEEK_CUR) == -1)
+ {
+ perror (progname);
+ return 1;
+ }
+ add_entry (ze);
+ if (i < count - 1)
+ {
+ if (read (fd, header, 46) != 46)
+ {
+ fprintf (stderr, "%s: %s: unexpected end of file\n",
+ progname, jarfile);
+ return 1;
+ }
+ }
+ }
+
+ lseek (fd, 0, SEEK_SET);
+ return 0;
+}
+
+int make_manifest(int jfd, const char *mf_name, int updating){
time_t current_time;
int nlen; /* length of file name */
int mod_time; /* file modification time */
exit(1);
}
- if(add_file_to_jar(jfd, mfd, "META-INF/MANIFEST.MF", &statbuf)){
+ if(add_file_to_jar(jfd, mfd, "META-INF/MANIFEST.MF", &statbuf, updating)){
perror("error writing to jar");
exit(1);
}
}
/* Implements -C by wrapping add_to_jar. new_dir is the directory
- to switch to. */
+ to switch to.
+
+ `updating', if nonzero, will indicate that we are updating an
+ existing file, and will need to take special care. If set, we will
+ also expect that the linked list of zip entries will be filled in
+ with the jar file's current contents.
+ */
int
-add_to_jar_with_dir (int fd, const char* new_dir, const char* file)
+add_to_jar_with_dir (int fd, const char* new_dir, const char* file,
+ const int updating)
{
int retval;
char old_dir[MAXPATHLEN];
perror(new_dir);
return 1;
}
- retval=add_to_jar(fd, file);
+ retval=add_to_jar(fd, file, updating);
if (chdir(old_dir) == -1) {
perror(old_dir);
return 1;
}
int
-add_to_jar (int fd, const char *file) {
+add_to_jar (int fd, const char *file, const int updating)
+{
struct stat statbuf;
DIR *dir;
struct dirent *de;
zipentry *ze;
+ zipentry *existing = NULL;
int stat_return;
/* This is a quick compatibility fix -- Simon Weijgers <simon@weijgers.com>
PACK_UB2(file_header, LOC_FNLEN, nlen);
PACK_UB4(file_header, LOC_MODTIME, mod_time);
- if(verbose)
- printf("adding: %s (in=%d) (out=%d) (stored 0%%)\n", fullname, 0, 0);
-
ze = (zipentry*)malloc(sizeof(zipentry));
if(ze == NULL){
perror("malloc");
ze->mod_date = (ub2)((mod_time & 0xffff0000) >> 16);
ze->compressed = FALSE;
- add_entry(ze);
+ if (updating)
+ {
+ if ((existing = find_entry (ze->filename)) != NULL)
+ {
+ if (existing->usize != 0)
+ {
+ /* XXX overwriting non-directory with directory? */
+ fprintf (stderr, "%s: %s: can't overwrite non-directory with directory\n",
+ progname, fullname);
+ return 1;
+ }
+ }
+ if (lseek (fd, end_of_entries, SEEK_SET) == -1)
+ {
+ fprintf (stderr, "%s %d\n", __FILE__, __LINE__);
+ perror ("lseek");
+ return 1;
+ }
+ }
+
+ if (!existing)
+ {
+ add_entry (ze);
+ write (fd, file_header, 30);
+ write (fd, fullname, nlen);
+ end_of_entries = lseek (fd, 0, SEEK_CUR);
- write(fd, file_header, 30);
- write(fd, fullname, nlen);
+ if (verbose)
+ printf ("adding: %s (in=%d) (out=%d) (stored 0%%)\n", fullname, 0, 0);
+ }
while(!use_explicit_list_only && (de = readdir(dir)) != NULL){
if(de->d_name[0] == '.')
strcpy(t_ptr, de->d_name);
- if (add_to_jar(fd, fullname)) {
+ if (add_to_jar(fd, fullname, updating)) {
fprintf(stderr, "Error adding file to jar!\n");
return 1;
}
return 1;
}
- if(add_file_to_jar(fd, add_fd, file, &statbuf)){
+ if(add_file_to_jar(fd, add_fd, file, &statbuf, updating)){
fprintf(stderr, "Error adding file to jar!\n");
return 1;
}
return 0;
}
-int add_file_to_jar(int jfd, int ffd, const char *fname, struct stat *statbuf){
-
+int add_file_to_jar(int jfd, int ffd, const char *fname, struct stat *statbuf,
+ const int updating)
+{
unsigned short file_name_length;
unsigned long mod_time;
ub1 rd_buff[RDSZ];
off_t offset = 0;
int rdamt;
struct zipentry *ze;
+ struct zipentry *existing = NULL;
+
+ if (updating)
+ {
+ existing = find_entry (fname);
+ if (existing && looks_like_dir (fname))
+ {
+ fprintf (stderr, "%s: %s is a directory in the archive\n",
+ progname, fname);
+ return 1;
+ }
+ }
mod_time = unix2dostime(&(statbuf->st_mtime));
file_name_length = strlen(fname);
ze->csize = statbuf->st_size;
ze->usize = ze->csize;
- ze->offset = lseek(jfd, 0, SEEK_CUR);
+
+ if (existing)
+ ze->offset = existing->offset;
+ else if (updating)
+ ze->offset = end_of_entries;
+ else
+ ze->offset = lseek(jfd, 0, SEEK_CUR);
+
if(do_compress)
ze->compressed = TRUE;
else
ze->compressed = FALSE;
-
- add_entry(ze);
+
+ if (!existing)
+ add_entry(ze);
+ if (updating && lseek (jfd, ze->offset, SEEK_SET) < 0)
+ {
+ perror ("lseek");
+ return 1;
+ }
+
+ /* We can safely write the header here, since it will be the same size
+ as before */
/* Write the local header */
write(jfd, file_header, 30);
if(verbose){
- printf("adding: %s ", fname);
+ if (existing)
+ printf ("updating: %s ", fname);
+ else
+ printf("adding: %s ", fname);
fflush(stdout);
}
if(do_compress){
/* compress the file */
- compress_file(ffd, jfd, ze);
+ compress_file(ffd, jfd, ze, existing);
} else {
+ /* If we are not writing the last entry, make space for it. */
+ if (existing && existing->next_entry)
+ {
+ if (ze->usize > existing->usize)
+ {
+ if (shift_down (jfd, existing->next_entry->offset,
+ ze->usize - existing->usize, existing->next_entry))
+ {
+ fprintf (stderr, "%s: %s\n", progname, strerror (errno));
+ return 1;
+ }
+ }
+ }
+
/* Write the contents of the file (uncompressed) to the zip file */
/* calculate the CRC as we go along */
ze->crc = crc32(0L, Z_NULL, 0);
/* Sun's jar tool will only allow a data descriptor if the entry is
compressed, but we'll save 16 bytes/entry if we only use it when
we can't seek back on the file */
+ /* Technically, you CAN'T have a data descriptor unless the data
+ part has an obvious end, which DEFLATED does. Otherwise, there
+ would not be any way to determine where the data descriptor is.
+ Store an uncompressed file that ends with 0x504b0708, and see.
+ -- csm */
if(write(jfd, data_descriptor, 16) != 16){
perror("write");
return 0;
}
}
+
+ if (existing)
+ {
+ int dd = (existing->flags & (1 << 3)) ? 12 : 0;
+ if (existing->next_entry && ze->csize < existing->csize + dd)
+ {
+ if (shift_up (jfd, existing->next_entry->offset,
+ existing->csize + dd - ze->csize,
+ existing->next_entry))
+ {
+ perror (progname);
+ return 1;
+ }
+ }
+ /* Replace the existing entry data with this entry's. */
+ existing->csize = ze->csize;
+ existing->usize = ze->usize;
+ existing->crc = ze->crc;
+ existing->mod_time = ze->mod_time;
+ existing->mod_date = ze->mod_date;
+ free (ze->filename);
+ free (ze);
+ }
+ else if (updating)
+ end_of_entries = lseek (jfd, 0, SEEK_CUR);
if(verbose)
printf("(in=%d) (out=%d) (%s %d%%)\n",
{
printf("jar (%s) %s\n\n", PACKAGE, VERSION);
printf("Copyright 1999, 2000, 2001 Bryan Burns\n");
- printf("Copyright 2002 Free Software Foundation\n");
+ printf("Copyright 2002, 2004 Free Software Foundation\n");
printf("\
This is free software; see the source for copying conditions. There is NO\n\
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n");
--- /dev/null
+/* shift.c -- utilities to move regions of data in a file.
+ Copyright (C) 2004 Free Software Foundation, Inc.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at
+your option) any later version.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+USA. */
+
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+#include "jartool.h"
+#include "shift.h"
+
+#define BUFFER_SIZE 1024
+
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+
+/*
+ * Shift the contents of a file up by `amount' bytes, starting at `begin'.
+ * The file is not truncated, data from `amount' to `begin - amount' is
+ * overwritten. The current file pointer of `fd' is preserved. Note that
+ * this might be past the new "end" of the file.
+ *
+ * If this function is passed a `struct zipentry', then all `offset'
+ * fields from that entry down the list that are greater than or equal
+ * to `begin' will be decreased by `amount'.
+ *
+ * fd - The file descriptor.
+ * begin - The offset of the first byte that should be shifted.
+ * amount - The number of bytes to shift by.
+ * ze - A pointer into a list of zip entries that should be updated
+ * to reflect the modified offset.
+ */
+int
+shift_up (int fd, off_t begin, off_t amount, struct zipentry *ze)
+{
+ extern off_t end_of_entries;
+ int len, moved = 0;
+ ub1 buffer[BUFFER_SIZE];
+ off_t where, end, save;
+
+ if (amount <= 0)
+ return 0;
+
+ if ((save = lseek (fd, 0, SEEK_CUR)) == -1)
+ return 1;
+ if ((end = lseek (fd, 0, SEEK_END)) == -1)
+ return 1;
+ if (end < begin)
+ return 0;
+
+ where = begin;
+
+ do
+ {
+ if (lseek (fd, where, SEEK_SET) < 0)
+ return 1;
+ if ((len = read (fd, buffer, BUFFER_SIZE)) < 0)
+ return 1;
+ if (len == 0)
+ break;
+ if (lseek (fd, where - amount, SEEK_SET) < 0)
+ return 1;
+ if (write (fd, buffer, len) < 0)
+ return 1;
+ where += len;
+ }
+ while (where < end);
+
+ for (; ze; ze = ze->next_entry)
+ {
+ if (ze->offset >= begin)
+ {
+ ze->offset -= amount;
+ moved = 1;
+ }
+ }
+ if (moved)
+ end_of_entries -= amount;
+
+ if (lseek (fd, save, SEEK_SET) == -1)
+ return 1;
+ return 0;
+}
+
+/*
+ * Shift the contents of this file down by `amount' bytes, extending the
+ * end of file, starting at `begin'. This function will preserve the
+ * current file pointer of `fd'. Naturally, this function will fail if
+ * `fd' is not seekable.
+ *
+ * If this function is passed a `struct zipentry', then all `offset'
+ * fields from that entry down the list that are greater than or equal
+ * to `begin' will be increased by `amount'.
+ *
+ * fd - The file descriptor.
+ * begin - The offset of the first byte that should be shifted.
+ * amount - The number of bytes to shift by.
+ * ze - A pointer into a list of zip entries that should be updated
+ * to reflect the modified offset.
+ */
+int
+shift_down (int fd, off_t begin, off_t amount, struct zipentry *ze)
+{
+ extern off_t end_of_entries;
+ int off, len, moved = 0;
+ ub1 buffer[BUFFER_SIZE];
+ off_t where, save;
+
+ if (amount <= 0)
+ return 0;
+
+ if ((save = lseek (fd, 0, SEEK_CUR)) == -1)
+ return 1;
+ if ((where = lseek (fd, 0, SEEK_END)) == -1)
+ return 1;
+ if (where < begin)
+ return 0;
+ off = (where - begin) % BUFFER_SIZE;
+ if (off == 0)
+ where -= BUFFER_SIZE;
+ else
+ where -= off;
+
+ do
+ {
+ if (lseek (fd, where, SEEK_SET) < 0)
+ return 1;
+ if ((len = read (fd, buffer, BUFFER_SIZE)) < 0)
+ return 1;
+ if (lseek (fd, where + amount, SEEK_SET) < 0)
+ return 1;
+ if (write (fd, buffer, len) < 0)
+ return 1;
+ where -= BUFFER_SIZE;
+ }
+ while (where >= begin);
+
+ for (; ze; ze = ze->next_entry)
+ {
+ if (ze->offset >= begin)
+ {
+ ze->offset += amount;
+ moved = 1;
+ }
+ }
+ if (moved)
+ end_of_entries += amount;
+
+ if (lseek (fd, save, SEEK_SET) == -1)
+ return 1;
+
+ return 0;
+}
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