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-rw-r--r--libtar/libtar.h300
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diff --git a/libtar/libtar.h b/libtar/libtar.h
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+++ b/libtar/libtar.h
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+/*
+** Copyright 1998-2003 University of Illinois Board of Trustees
+** Copyright 1998-2003 Mark D. Roth
+** All rights reserved.
+**
+** libtar.h - header file for libtar library
+**
+** Mark D. Roth <roth@uiuc.edu>
+** Campus Information Technologies and Educational Services
+** University of Illinois at Urbana-Champaign
+*/
+
+#ifndef LIBTAR_H
+#define LIBTAR_H
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "tar.h"
+
+#include "libtar_listhash.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+
+/* useful constants */
+#define T_BLOCKSIZE 512
+#define T_NAMELEN 100
+#define T_PREFIXLEN 155
+#define T_MAXPATHLEN (T_NAMELEN + T_PREFIXLEN)
+
+/* GNU extensions for typeflag */
+#define GNU_LONGNAME_TYPE 'L'
+#define GNU_LONGLINK_TYPE 'K'
+
+/* our version of the tar header structure */
+struct tar_header
+{
+ char name[100];
+ char mode[8];
+ char uid[8];
+ char gid[8];
+ char size[12];
+ char mtime[12];
+ char chksum[8];
+ char typeflag;
+ char linkname[100];
+ char magic[6];
+ char version[2];
+ char uname[32];
+ char gname[32];
+ char devmajor[8];
+ char devminor[8];
+ char prefix[155];
+ char padding[12];
+ char *gnu_longname;
+ char *gnu_longlink;
+};
+
+
+/***** handle.c ************************************************************/
+
+typedef int (*openfunc_t)(const char *, int, ...);
+typedef int (*closefunc_t)(int);
+typedef ssize_t (*readfunc_t)(int, void *, size_t);
+typedef ssize_t (*writefunc_t)(int, const void *, size_t);
+
+typedef struct
+{
+ openfunc_t openfunc;
+ closefunc_t closefunc;
+ readfunc_t readfunc;
+ writefunc_t writefunc;
+}
+tartype_t;
+
+typedef struct
+{
+ tartype_t *type;
+ char *pathname;
+ long fd;
+ int oflags;
+ int options;
+ struct tar_header th_buf;
+ libtar_hash_t *h;
+}
+TAR;
+
+/* constant values for the TAR options field */
+#define TAR_GNU 1 /* use GNU extensions */
+#define TAR_VERBOSE 2 /* output file info to stdout */
+#define TAR_NOOVERWRITE 4 /* don't overwrite existing files */
+#define TAR_IGNORE_EOT 8 /* ignore double zero blocks as EOF */
+#define TAR_CHECK_MAGIC 16 /* check magic in file header */
+#define TAR_CHECK_VERSION 32 /* check version in file header */
+#define TAR_IGNORE_CRC 64 /* ignore CRC in file header */
+
+/* this is obsolete - it's here for backwards-compatibility only */
+#define TAR_IGNORE_MAGIC 0
+
+extern const char libtar_version[];
+
+
+/* open a new tarfile handle */
+int tar_open(TAR **t, char *pathname, tartype_t *type,
+ int oflags, int mode, int options);
+
+/* make a tarfile handle out of a previously-opened descriptor */
+int tar_fdopen(TAR **t, int fd, char *pathname, tartype_t *type,
+ int oflags, int mode, int options);
+
+/* returns the descriptor associated with t */
+int tar_fd(TAR *t);
+
+/* close tarfile handle */
+int tar_close(TAR *t);
+
+
+/***** append.c ************************************************************/
+
+/* forward declaration to appease the compiler */
+struct tar_dev;
+
+/* cleanup function */
+void tar_dev_free(struct tar_dev *tdp);
+
+/* Appends a file to the tar archive.
+ * Arguments:
+ * t = TAR handle to append to
+ * realname = path of file to append
+ * savename = name to save the file under in the archive
+ */
+int tar_append_file(TAR *t, char *realname, char *savename);
+
+/* write EOF indicator */
+int tar_append_eof(TAR *t);
+
+/* add file contents to a tarchive */
+int tar_append_regfile(TAR *t, char *realname);
+
+
+/***** block.c *************************************************************/
+
+/* macros for reading/writing tarchive blocks */
+#define tar_block_read(t, buf) \
+ (*((t)->type->readfunc))((t)->fd, (char *)(buf), T_BLOCKSIZE)
+#define tar_block_write(t, buf) \
+ (*((t)->type->writefunc))((t)->fd, (char *)(buf), T_BLOCKSIZE)
+
+/* read/write a header block */
+int th_read(TAR *t);
+int th_write(TAR *t);
+
+
+/***** decode.c ************************************************************/
+
+/* determine file type */
+#define TH_ISREG(t) ((t)->th_buf.typeflag == REGTYPE \
+ || (t)->th_buf.typeflag == AREGTYPE \
+ || (t)->th_buf.typeflag == CONTTYPE \
+ || (S_ISREG((mode_t)oct_to_int((t)->th_buf.mode)) \
+ && (t)->th_buf.typeflag != LNKTYPE))
+#define TH_ISLNK(t) ((t)->th_buf.typeflag == LNKTYPE)
+#define TH_ISSYM(t) ((t)->th_buf.typeflag == SYMTYPE \
+ || S_ISLNK((mode_t)oct_to_int((t)->th_buf.mode)))
+#define TH_ISCHR(t) ((t)->th_buf.typeflag == CHRTYPE \
+ || S_ISCHR((mode_t)oct_to_int((t)->th_buf.mode)))
+#define TH_ISBLK(t) ((t)->th_buf.typeflag == BLKTYPE \
+ || S_ISBLK((mode_t)oct_to_int((t)->th_buf.mode)))
+#define TH_ISDIR(t) ((t)->th_buf.typeflag == DIRTYPE \
+ || S_ISDIR((mode_t)oct_to_int((t)->th_buf.mode)) \
+ || ((t)->th_buf.typeflag == AREGTYPE \
+ && ((t)->th_buf.name[strlen((t)->th_buf.name) - 1] == '/')))
+#define TH_ISFIFO(t) ((t)->th_buf.typeflag == FIFOTYPE \
+ || S_ISFIFO((mode_t)oct_to_int((t)->th_buf.mode)))
+#define TH_ISLONGNAME(t) ((t)->th_buf.typeflag == GNU_LONGNAME_TYPE)
+#define TH_ISLONGLINK(t) ((t)->th_buf.typeflag == GNU_LONGLINK_TYPE)
+
+/* decode tar header info */
+#define th_get_crc(t) oct_to_int((t)->th_buf.chksum)
+#define th_get_size(t) oct_to_int((t)->th_buf.size)
+#define th_get_mtime(t) oct_to_int((t)->th_buf.mtime)
+#define th_get_devmajor(t) oct_to_int((t)->th_buf.devmajor)
+#define th_get_devminor(t) oct_to_int((t)->th_buf.devminor)
+#define th_get_linkname(t) ((t)->th_buf.gnu_longlink \
+ ? (t)->th_buf.gnu_longlink \
+ : (t)->th_buf.linkname)
+char *th_get_pathname(TAR *t);
+mode_t th_get_mode(TAR *t);
+uid_t th_get_uid(TAR *t);
+gid_t th_get_gid(TAR *t);
+
+
+/***** encode.c ************************************************************/
+
+/* encode file info in th_header */
+void th_set_type(TAR *t, mode_t mode);
+void th_set_path(TAR *t, char *pathname);
+void th_set_link(TAR *t, char *linkname);
+void th_set_device(TAR *t, dev_t device);
+void th_set_user(TAR *t, uid_t uid);
+void th_set_group(TAR *t, gid_t gid);
+void th_set_mode(TAR *t, mode_t fmode);
+#define th_set_mtime(t, fmtime) \
+ int_to_oct_nonull((fmtime), (t)->th_buf.mtime, 12)
+#define th_set_size(t, fsize) \
+ int_to_oct_nonull((fsize), (t)->th_buf.size, 12)
+
+/* encode everything at once (except the pathname and linkname) */
+void th_set_from_stat(TAR *t, struct stat *s);
+
+/* encode magic, version, and crc - must be done after everything else is set */
+void th_finish(TAR *t);
+
+
+/***** extract.c ***********************************************************/
+
+/* sequentially extract next file from t */
+int tar_extract_file(TAR *t, char *realname);
+
+/* extract different file types */
+int tar_extract_dir(TAR *t, char *realname);
+int tar_extract_hardlink(TAR *t, char *realname);
+int tar_extract_symlink(TAR *t, char *realname);
+int tar_extract_chardev(TAR *t, char *realname);
+int tar_extract_blockdev(TAR *t, char *realname);
+int tar_extract_fifo(TAR *t, char *realname);
+
+/* for regfiles, we need to extract the content blocks as well */
+int tar_extract_regfile(TAR *t, char *realname);
+int tar_skip_regfile(TAR *t);
+
+
+/***** output.c ************************************************************/
+
+/* print the tar header */
+void th_print(TAR *t);
+
+/* print "ls -l"-like output for the file described by th */
+void th_print_long_ls(TAR *t);
+
+
+/***** util.c *************************************************************/
+
+/* hashing function for pathnames */
+int path_hashfunc(char *key, int numbuckets);
+
+/* matching function for dev_t's */
+int dev_match(dev_t *dev1, dev_t *dev2);
+
+/* matching function for ino_t's */
+int ino_match(ino_t *ino1, ino_t *ino2);
+
+/* hashing function for dev_t's */
+int dev_hash(dev_t *dev);
+
+/* hashing function for ino_t's */
+int ino_hash(ino_t *inode);
+
+/* create any necessary dirs */
+int mkdirhier(char *path);
+
+/* calculate header checksum */
+int th_crc_calc(TAR *t);
+
+/* calculate a signed header checksum */
+int th_signed_crc_calc(TAR *t);
+
+/* compare checksums in a forgiving way */
+#define th_crc_ok(t) (th_get_crc(t) == th_crc_calc(t) || th_get_crc(t) == th_signed_crc_calc(t))
+
+/* string-octal to integer conversion */
+int oct_to_int(char *oct);
+
+/* integer to NULL-terminated string-octal conversion */
+#define int_to_oct(num, oct, octlen) \
+ snprintf((oct), (octlen), "%*lo ", (octlen) - 2, (unsigned long)(num))
+
+/* integer to string-octal conversion, no NULL */
+void int_to_oct_nonull(int num, char *oct, size_t octlen);
+
+
+/***** wrapper.c **********************************************************/
+
+/* extract groups of files */
+int tar_extract_glob(TAR *t, char *globname, char *prefix);
+int tar_extract_all(TAR *t, char *prefix);
+
+/* add a whole tree of files */
+int tar_append_tree(TAR *t, char *realdir, char *savedir);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ! LIBTAR_H */
+
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