1 files changed, 213 insertions, 0 deletions

diff --git a/libtar/encode.c b/libtar/encode.c
new file mode 100644
index 000000000..662eff584
--- /dev/null
+++ b/libtar/encode.c
@@ -0,0 +1,213 @@
+/*
+**  Copyright 1998-2003 University of Illinois Board of Trustees
+**  Copyright 1998-2003 Mark D. Roth
+**  All rights reserved.
+**
+**  encode.c - libtar code to encode tar header blocks
+**
+**  Mark D. Roth <roth@uiuc.edu>
+**  Campus Information Technologies and Educational Services
+**  University of Illinois at Urbana-Champaign
+*/
+
+#include <internal.h>
+
+#include <stdio.h>
+#include <pwd.h>
+#include <grp.h>
+#include <sys/types.h>
+
+#ifdef STDC_HEADERS
+# include <string.h>
+# include <stdlib.h>
+#endif
+
+
+/* magic, version, and checksum */
+void
+th_finish(TAR *t)
+{
+	if (t->options & TAR_GNU)
+	{
+		/* we're aiming for this result, but must do it in
+		 * two calls to avoid FORTIFY segfaults on some Linux
+		 * systems:
+		 *      strncpy(t->th_buf.magic, "ustar  ", 8);
+		 */
+		strncpy(t->th_buf.magic, "ustar ", 6);
+		strncpy(t->th_buf.version, " ", 2);
+	}
+	else
+	{
+		strncpy(t->th_buf.version, TVERSION, TVERSLEN);
+		strncpy(t->th_buf.magic, TMAGIC, TMAGLEN);
+	}
+
+	int_to_oct(th_crc_calc(t), t->th_buf.chksum, 8);
+}
+
+
+/* map a file mode to a typeflag */
+void
+th_set_type(TAR *t, mode_t mode)
+{
+	if (S_ISLNK(mode))
+		t->th_buf.typeflag = SYMTYPE;
+	if (S_ISREG(mode))
+		t->th_buf.typeflag = REGTYPE;
+	if (S_ISDIR(mode))
+		t->th_buf.typeflag = DIRTYPE;
+	if (S_ISCHR(mode))
+		t->th_buf.typeflag = CHRTYPE;
+	if (S_ISBLK(mode))
+		t->th_buf.typeflag = BLKTYPE;
+	if (S_ISFIFO(mode) || S_ISSOCK(mode))
+		t->th_buf.typeflag = FIFOTYPE;
+}
+
+
+/* encode file path */
+void
+th_set_path(TAR *t, char *pathname)
+{
+	char suffix[2] = "";
+	char *tmp;
+
+#ifdef DEBUG
+	printf("in th_set_path(th, pathname=\"%s\")\n", pathname);
+#endif
+
+	if (t->th_buf.gnu_longname != NULL)
+		free(t->th_buf.gnu_longname);
+	t->th_buf.gnu_longname = NULL;
+
+	if (pathname[strlen(pathname) - 1] != '/' && TH_ISDIR(t))
+		strcpy(suffix, "/");
+
+	if (strlen(pathname) > T_NAMELEN-1 && (t->options & TAR_GNU))
+	{
+		/* GNU-style long name */
+		t->th_buf.gnu_longname = strdup(pathname);
+		strncpy(t->th_buf.name, t->th_buf.gnu_longname, T_NAMELEN);
+	}
+	else if (strlen(pathname) > T_NAMELEN)
+	{
+		/* POSIX-style prefix field */
+		tmp = strchr(&(pathname[strlen(pathname) - T_NAMELEN - 1]), '/');
+		if (tmp == NULL)
+		{
+			printf("!!! '/' not found in \"%s\"\n", pathname);
+			return;
+		}
+		snprintf(t->th_buf.name, 100, "%s%s", &(tmp[1]), suffix);
+		snprintf(t->th_buf.prefix,
+			 ((tmp - pathname + 1) <
+			  155 ? (tmp - pathname + 1) : 155), "%s", pathname);
+	}
+	else
+		/* classic tar format */
+		snprintf(t->th_buf.name, 100, "%s%s", pathname, suffix);
+
+#ifdef DEBUG
+	puts("returning from th_set_path()...");
+#endif
+}
+
+
+/* encode link path */
+void
+th_set_link(TAR *t, char *linkname)
+{
+#ifdef DEBUG
+	printf("==> th_set_link(th, linkname=\"%s\")\n", linkname);
+#endif
+
+	if (strlen(linkname) > T_NAMELEN-1 && (t->options & TAR_GNU))
+	{
+		/* GNU longlink format */
+		t->th_buf.gnu_longlink = strdup(linkname);
+		strcpy(t->th_buf.linkname, "././@LongLink");
+	}
+	else
+	{
+		/* classic tar format */
+		strlcpy(t->th_buf.linkname, linkname,
+			sizeof(t->th_buf.linkname));
+		if (t->th_buf.gnu_longlink != NULL)
+			free(t->th_buf.gnu_longlink);
+		t->th_buf.gnu_longlink = NULL;
+	}
+}
+
+
+/* encode device info */
+void
+th_set_device(TAR *t, dev_t device)
+{
+#ifdef DEBUG
+	printf("th_set_device(): major = %d, minor = %d\n",
+	       major(device), minor(device));
+#endif
+	int_to_oct(major(device), t->th_buf.devmajor, 8);
+	int_to_oct(minor(device), t->th_buf.devminor, 8);
+}
+
+
+/* encode user info */
+void
+th_set_user(TAR *t, uid_t uid)
+{
+	struct passwd *pw;
+
+	pw = getpwuid(uid);
+	if (pw != NULL)
+		strlcpy(t->th_buf.uname, pw->pw_name, sizeof(t->th_buf.uname));
+
+	int_to_oct(uid, t->th_buf.uid, 8);
+}
+
+
+/* encode group info */
+void
+th_set_group(TAR *t, gid_t gid)
+{
+	struct group *gr;
+
+	gr = getgrgid(gid);
+	if (gr != NULL)
+		strlcpy(t->th_buf.gname, gr->gr_name, sizeof(t->th_buf.gname));
+
+	int_to_oct(gid, t->th_buf.gid, 8);
+}
+
+
+/* encode file mode */
+void
+th_set_mode(TAR *t, mode_t fmode)
+{
+	if (S_ISSOCK(fmode))
+	{
+		fmode &= ~S_IFSOCK;
+		fmode |= S_IFIFO;
+	}
+	int_to_oct(fmode, (t)->th_buf.mode, 8);
+}
+
+
+void
+th_set_from_stat(TAR *t, struct stat *s)
+{
+	th_set_type(t, s->st_mode);
+	if (S_ISCHR(s->st_mode) || S_ISBLK(s->st_mode))
+		th_set_device(t, s->st_rdev);
+	th_set_user(t, s->st_uid);
+	th_set_group(t, s->st_gid);
+	th_set_mode(t, s->st_mode);
+	th_set_mtime(t, s->st_mtime);
+	if (S_ISREG(s->st_mode))
+		th_set_size(t, s->st_size);
+	else
+		th_set_size(t, 0);
+}
+
+