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552 lines
16 KiB
552 lines
16 KiB
/*-
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* Copyright (c) 2007 Kai Wang
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* Copyright (c) 2007 Tim Kientzle
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "archive_platform.h"
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__FBSDID("$FreeBSD: src/lib/libarchive/archive_write_set_format_ar.c,v 1.8 2008/08/10 02:06:28 kientzle Exp $");
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include "archive.h"
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#include "archive_entry.h"
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#include "archive_private.h"
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#include "archive_write_private.h"
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struct ar_w {
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uint64_t entry_bytes_remaining;
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uint64_t entry_padding;
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int is_strtab;
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int has_strtab;
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char *strtab;
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};
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/*
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* Define structure of the "ar" header.
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*/
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#define AR_name_offset 0
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#define AR_name_size 16
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#define AR_date_offset 16
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#define AR_date_size 12
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#define AR_uid_offset 28
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#define AR_uid_size 6
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#define AR_gid_offset 34
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#define AR_gid_size 6
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#define AR_mode_offset 40
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#define AR_mode_size 8
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#define AR_size_offset 48
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#define AR_size_size 10
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#define AR_fmag_offset 58
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#define AR_fmag_size 2
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static int archive_write_set_format_ar(struct archive_write *);
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static int archive_write_ar_header(struct archive_write *,
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struct archive_entry *);
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static ssize_t archive_write_ar_data(struct archive_write *,
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const void *buff, size_t s);
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static int archive_write_ar_destroy(struct archive_write *);
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static int archive_write_ar_finish(struct archive_write *);
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static int archive_write_ar_finish_entry(struct archive_write *);
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static const char *ar_basename(const char *path);
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static int format_octal(int64_t v, char *p, int s);
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static int format_decimal(int64_t v, char *p, int s);
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int
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archive_write_set_format_ar_bsd(struct archive *_a)
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{
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struct archive_write *a = (struct archive_write *)_a;
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int r = archive_write_set_format_ar(a);
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if (r == ARCHIVE_OK) {
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a->archive.archive_format = ARCHIVE_FORMAT_AR_BSD;
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a->archive.archive_format_name = "ar (BSD)";
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}
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return (r);
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}
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int
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archive_write_set_format_ar_svr4(struct archive *_a)
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{
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struct archive_write *a = (struct archive_write *)_a;
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int r = archive_write_set_format_ar(a);
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if (r == ARCHIVE_OK) {
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a->archive.archive_format = ARCHIVE_FORMAT_AR_GNU;
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a->archive.archive_format_name = "ar (GNU/SVR4)";
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}
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return (r);
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}
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/*
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* Generic initialization.
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*/
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static int
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archive_write_set_format_ar(struct archive_write *a)
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{
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struct ar_w *ar;
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/* If someone else was already registered, unregister them. */
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if (a->format_destroy != NULL)
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(a->format_destroy)(a);
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ar = (struct ar_w *)malloc(sizeof(*ar));
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if (ar == NULL) {
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archive_set_error(&a->archive, ENOMEM, "Can't allocate ar data");
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return (ARCHIVE_FATAL);
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}
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memset(ar, 0, sizeof(*ar));
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a->format_data = ar;
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a->format_name = "ar";
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a->format_write_header = archive_write_ar_header;
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a->format_write_data = archive_write_ar_data;
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a->format_finish = archive_write_ar_finish;
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a->format_destroy = archive_write_ar_destroy;
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a->format_finish_entry = archive_write_ar_finish_entry;
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return (ARCHIVE_OK);
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}
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static int
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archive_write_ar_header(struct archive_write *a, struct archive_entry *entry)
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{
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int ret, append_fn;
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char buff[60];
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char *ss, *se;
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struct ar_w *ar;
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const char *pathname;
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const char *filename;
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int64_t size;
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ret = 0;
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append_fn = 0;
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ar = (struct ar_w *)a->format_data;
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ar->is_strtab = 0;
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filename = NULL;
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size = archive_entry_size(entry);
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/*
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* Reject files with empty name.
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*/
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pathname = archive_entry_pathname(entry);
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if (*pathname == '\0') {
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archive_set_error(&a->archive, EINVAL,
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"Invalid filename");
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return (ARCHIVE_WARN);
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}
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/*
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* If we are now at the beginning of the archive,
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* we need first write the ar global header.
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*/
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if (a->archive.file_position == 0)
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(a->compressor.write)(a, "!<arch>\n", 8);
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memset(buff, ' ', 60);
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strncpy(&buff[AR_fmag_offset], "`\n", 2);
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if (strcmp(pathname, "/") == 0 ) {
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/* Entry is archive symbol table in GNU format */
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buff[AR_name_offset] = '/';
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goto stat;
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}
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if (strcmp(pathname, "__.SYMDEF") == 0) {
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/* Entry is archive symbol table in BSD format */
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strncpy(buff + AR_name_offset, "__.SYMDEF", 9);
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goto stat;
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}
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if (strcmp(pathname, "//") == 0) {
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/*
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* Entry is archive filename table, inform that we should
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* collect strtab in next _data call.
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*/
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ar->is_strtab = 1;
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buff[AR_name_offset] = buff[AR_name_offset + 1] = '/';
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/*
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* For archive string table, only ar_size filed should
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* be set.
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*/
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goto size;
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}
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/*
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* Otherwise, entry is a normal archive member.
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* Strip leading paths from filenames, if any.
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*/
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if ((filename = ar_basename(pathname)) == NULL) {
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/* Reject filenames with trailing "/" */
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archive_set_error(&a->archive, EINVAL,
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"Invalid filename");
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return (ARCHIVE_WARN);
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}
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if (a->archive.archive_format == ARCHIVE_FORMAT_AR_GNU) {
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/*
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* SVR4/GNU variant use a "/" to mark then end of the filename,
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* make it possible to have embedded spaces in the filename.
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* So, the longest filename here (without extension) is
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* actually 15 bytes.
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*/
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if (strlen(filename) <= 15) {
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strncpy(&buff[AR_name_offset],
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filename, strlen(filename));
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buff[AR_name_offset + strlen(filename)] = '/';
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} else {
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/*
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* For filename longer than 15 bytes, GNU variant
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* makes use of a string table and instead stores the
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* offset of the real filename to in the ar_name field.
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* The string table should have been written before.
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*/
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if (ar->has_strtab <= 0) {
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archive_set_error(&a->archive, EINVAL,
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"Can't find string table");
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return (ARCHIVE_WARN);
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}
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se = (char *)malloc(strlen(filename) + 3);
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if (se == NULL) {
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archive_set_error(&a->archive, ENOMEM,
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"Can't allocate filename buffer");
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return (ARCHIVE_FATAL);
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}
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strncpy(se, filename, strlen(filename));
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strcpy(se + strlen(filename), "/\n");
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ss = strstr(ar->strtab, se);
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free(se);
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if (ss == NULL) {
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archive_set_error(&a->archive, EINVAL,
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"Invalid string table");
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return (ARCHIVE_WARN);
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}
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/*
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* GNU variant puts "/" followed by digits into
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* ar_name field. These digits indicates the real
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* filename string's offset to the string table.
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*/
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buff[AR_name_offset] = '/';
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if (format_decimal(ss - ar->strtab,
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buff + AR_name_offset + 1,
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AR_name_size - 1)) {
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archive_set_error(&a->archive, ERANGE,
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"string table offset too large");
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return (ARCHIVE_WARN);
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}
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}
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} else if (a->archive.archive_format == ARCHIVE_FORMAT_AR_BSD) {
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/*
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* BSD variant: for any file name which is more than
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* 16 chars or contains one or more embedded space(s), the
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* string "#1/" followed by the ASCII length of the name is
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* put into the ar_name field. The file size (stored in the
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* ar_size field) is incremented by the length of the name.
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* The name is then written immediately following the
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* archive header.
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*/
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if (strlen(filename) <= 16 && strchr(filename, ' ') == NULL) {
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strncpy(&buff[AR_name_offset], filename, strlen(filename));
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buff[AR_name_offset + strlen(filename)] = ' ';
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}
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else {
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strncpy(buff + AR_name_offset, "#1/", 3);
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if (format_decimal(strlen(filename),
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buff + AR_name_offset + 3,
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AR_name_size - 3)) {
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archive_set_error(&a->archive, ERANGE,
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"File name too long");
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return (ARCHIVE_WARN);
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}
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append_fn = 1;
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size += strlen(filename);
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}
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}
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stat:
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if (format_decimal(archive_entry_mtime(entry), buff + AR_date_offset, AR_date_size)) {
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archive_set_error(&a->archive, ERANGE,
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"File modification time too large");
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return (ARCHIVE_WARN);
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}
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if (format_decimal(archive_entry_uid(entry), buff + AR_uid_offset, AR_uid_size)) {
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archive_set_error(&a->archive, ERANGE,
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"Numeric user ID too large");
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return (ARCHIVE_WARN);
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}
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if (format_decimal(archive_entry_gid(entry), buff + AR_gid_offset, AR_gid_size)) {
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archive_set_error(&a->archive, ERANGE,
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"Numeric group ID too large");
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return (ARCHIVE_WARN);
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}
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if (format_octal(archive_entry_mode(entry), buff + AR_mode_offset, AR_mode_size)) {
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archive_set_error(&a->archive, ERANGE,
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"Numeric mode too large");
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return (ARCHIVE_WARN);
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}
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/*
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* Sanity Check: A non-pseudo archive member should always be
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* a regular file.
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*/
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if (filename != NULL && archive_entry_filetype(entry) != AE_IFREG) {
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archive_set_error(&a->archive, EINVAL,
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"Regular file required for non-pseudo member");
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return (ARCHIVE_WARN);
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}
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size:
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if (format_decimal(size, buff + AR_size_offset, AR_size_size)) {
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archive_set_error(&a->archive, ERANGE,
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"File size out of range");
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return (ARCHIVE_WARN);
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}
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ret = (a->compressor.write)(a, buff, 60);
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if (ret != ARCHIVE_OK)
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return (ret);
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ar->entry_bytes_remaining = size;
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ar->entry_padding = ar->entry_bytes_remaining % 2;
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if (append_fn > 0) {
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ret = (a->compressor.write)(a, filename, strlen(filename));
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if (ret != ARCHIVE_OK)
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return (ret);
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ar->entry_bytes_remaining -= strlen(filename);
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}
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return (ARCHIVE_OK);
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}
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static ssize_t
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archive_write_ar_data(struct archive_write *a, const void *buff, size_t s)
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{
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struct ar_w *ar;
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int ret;
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ar = (struct ar_w *)a->format_data;
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if (s > ar->entry_bytes_remaining)
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s = ar->entry_bytes_remaining;
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if (ar->is_strtab > 0) {
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if (ar->has_strtab > 0) {
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archive_set_error(&a->archive, EINVAL,
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"More than one string tables exist");
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return (ARCHIVE_WARN);
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}
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ar->strtab = (char *)malloc(s);
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if (ar->strtab == NULL) {
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archive_set_error(&a->archive, ENOMEM,
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"Can't allocate strtab buffer");
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return (ARCHIVE_FATAL);
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}
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strncpy(ar->strtab, buff, s);
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ar->has_strtab = 1;
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}
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ret = (a->compressor.write)(a, buff, s);
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if (ret != ARCHIVE_OK)
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return (ret);
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ar->entry_bytes_remaining -= s;
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return (s);
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}
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static int
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archive_write_ar_destroy(struct archive_write *a)
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{
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struct ar_w *ar;
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ar = (struct ar_w *)a->format_data;
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if (ar == NULL)
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return (ARCHIVE_OK);
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if (ar->has_strtab > 0) {
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free(ar->strtab);
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ar->strtab = NULL;
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}
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free(ar);
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a->format_data = NULL;
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return (ARCHIVE_OK);
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}
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static int
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archive_write_ar_finish(struct archive_write *a)
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{
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int ret;
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/*
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* If we haven't written anything yet, we need to write
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* the ar global header now to make it a valid ar archive.
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*/
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if (a->archive.file_position == 0) {
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ret = (a->compressor.write)(a, "!<arch>\n", 8);
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return (ret);
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}
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return (ARCHIVE_OK);
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}
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static int
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archive_write_ar_finish_entry(struct archive_write *a)
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{
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struct ar_w *ar;
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int ret;
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ar = (struct ar_w *)a->format_data;
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if (ar->entry_bytes_remaining != 0) {
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archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
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"Entry remaining bytes larger than 0");
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return (ARCHIVE_WARN);
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}
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if (ar->entry_padding == 0) {
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return (ARCHIVE_OK);
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}
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if (ar->entry_padding != 1) {
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archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
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"Padding wrong size: %d should be 1 or 0",
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ar->entry_padding);
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return (ARCHIVE_WARN);
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}
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ret = (a->compressor.write)(a, "\n", 1);
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return (ret);
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}
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/*
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* Format a number into the specified field using base-8.
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* NB: This version is slightly different from the one in
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* _ustar.c
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*/
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static int
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format_octal(int64_t v, char *p, int s)
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{
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int len;
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char *h;
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len = s;
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h = p;
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/* Octal values can't be negative, so use 0. */
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if (v < 0) {
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while (len-- > 0)
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*p++ = '0';
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return (-1);
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}
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p += s; /* Start at the end and work backwards. */
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do {
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*--p = (char)('0' + (v & 7));
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v >>= 3;
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} while (--s > 0 && v > 0);
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if (v == 0) {
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memmove(h, p, len - s);
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p = h + len - s;
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while (s-- > 0)
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*p++ = ' ';
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return (0);
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}
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/* If it overflowed, fill field with max value. */
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while (len-- > 0)
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*p++ = '7';
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return (-1);
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}
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/*
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* Format a number into the specified field using base-10.
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*/
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static int
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format_decimal(int64_t v, char *p, int s)
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{
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int len;
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char *h;
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len = s;
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h = p;
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/* Negative values in ar header are meaningless , so use 0. */
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if (v < 0) {
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while (len-- > 0)
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*p++ = '0';
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return (-1);
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}
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p += s;
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do {
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*--p = (char)('0' + (v % 10));
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v /= 10;
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} while (--s > 0 && v > 0);
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if (v == 0) {
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memmove(h, p, len - s);
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p = h + len - s;
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while (s-- > 0)
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*p++ = ' ';
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return (0);
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}
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/* If it overflowed, fill field with max value. */
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while (len-- > 0)
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*p++ = '9';
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return (-1);
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}
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static const char *
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ar_basename(const char *path)
|
|
{
|
|
const char *endp, *startp;
|
|
|
|
endp = path + strlen(path) - 1;
|
|
/*
|
|
* For filename with trailing slash(es), we return
|
|
* NULL indicating an error.
|
|
*/
|
|
if (*endp == '/')
|
|
return (NULL);
|
|
|
|
/* Find the start of the base */
|
|
startp = endp;
|
|
while (startp > path && *(startp - 1) != '/')
|
|
startp--;
|
|
|
|
return (startp);
|
|
}
|