mirror of
https://github.com/google/sandboxed-api.git
synced 2024-03-22 13:11:30 +08:00
313 lines
7.0 KiB
C++
313 lines
7.0 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// clang-format off
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#include "minitar.h" // NOLINT(build/include)
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/*
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* NO_CREATE implies NO_BZIP2_CREATE and NO_GZIP_CREATE and NO_COMPRESS_CREATE.
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*/
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#ifdef NO_CREATE
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#undef NO_BZIP2_CREATE
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#define NO_BZIP2_CREATE
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#undef NO_COMPRESS_CREATE
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#define NO_COMPRESS_CREATE
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#undef NO_GZIP_CREATE
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#define NO_GZIP_CREATE
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#endif
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/*
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* The combination of NO_BZIP2_CREATE and NO_BZIP2_EXTRACT is
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* equivalent to NO_BZIP2.
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*/
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#ifdef NO_BZIP2_CREATE
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#ifdef NO_BZIP2_EXTRACT
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#undef NO_BZIP2
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#define NO_BZIP2
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#endif
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#endif
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#ifdef NO_BZIP2
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#undef NO_BZIP2_EXTRACT
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#define NO_BZIP2_EXTRACT
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#undef NO_BZIP2_CREATE
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#define NO_BZIP2_CREATE
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#endif
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/*
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* The combination of NO_COMPRESS_CREATE and NO_COMPRESS_EXTRACT is
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* equivalent to NO_COMPRESS.
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*/
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#ifdef NO_COMPRESS_CREATE
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#ifdef NO_COMPRESS_EXTRACT
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#undef NO_COMPRESS
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#define NO_COMPRESS
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#endif
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#endif
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#ifdef NO_COMPRESS
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#undef NO_COMPRESS_EXTRACT
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#define NO_COMPRESS_EXTRACT
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#undef NO_COMPRESS_CREATE
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#define NO_COMPRESS_CREATE
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#endif
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/*
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* The combination of NO_GZIP_CREATE and NO_GZIP_EXTRACT is
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* equivalent to NO_GZIP.
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*/
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#ifdef NO_GZIP_CREATE
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#ifdef NO_GZIP_EXTRACT
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#undef NO_GZIP
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#define NO_GZIP
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#endif
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#endif
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#ifdef NO_GZIP
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#undef NO_GZIP_EXTRACT
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#define NO_GZIP_EXTRACT
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#undef NO_GZIP_CREATE
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#define NO_GZIP_CREATE
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#endif
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#ifndef NO_CREATE
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void create(const char* filename, int compress, const char** argv);
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#endif
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void errmsg(const char*);
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void extract(const char* filename, int do_extract, int flags);
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int copy_data(struct archive*, struct archive*);
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void msg(const char*);
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void usage(void);
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#ifndef NO_CREATE
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void create(const char* filename, int compress, const char** argv,
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int verbose) {
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struct archive* a;
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struct archive_entry* entry;
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ssize_t len;
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int fd;
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a = archive_write_new();
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switch (compress) {
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#ifndef NO_BZIP2_CREATE
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case 'j':
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case 'y':
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archive_write_add_filter_bzip2(a);
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break;
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#endif
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#ifndef NO_COMPRESS_CREATE
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case 'Z':
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archive_write_add_filter_compress(a);
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break;
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#endif
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#ifndef NO_GZIP_CREATE
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case 'z':
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archive_write_add_filter_gzip(a);
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break;
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#endif
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default:
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archive_write_add_filter_none(a);
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break;
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}
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archive_write_set_format_ustar(a);
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if (filename != NULL && strcmp(filename, "-") == 0) filename = NULL;
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archive_write_open_filename(a, filename);
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while (*argv != NULL) {
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struct archive* disk = archive_read_disk_new();
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#ifndef NO_LOOKUP
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archive_read_disk_set_standard_lookup(disk);
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#endif
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int r;
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r = archive_read_disk_open(disk, *argv);
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if (r != ARCHIVE_OK) {
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errmsg(archive_error_string(disk));
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errmsg("\n");
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exit(1);
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}
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for (;;) {
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int needcr = 0;
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entry = archive_entry_new();
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r = archive_read_next_header2(disk, entry);
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if (r == ARCHIVE_EOF) break;
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if (r != ARCHIVE_OK) {
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errmsg(archive_error_string(disk));
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errmsg("\n");
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exit(1);
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}
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archive_read_disk_descend(disk);
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if (verbose) {
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msg("a ");
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msg(archive_entry_pathname(entry));
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needcr = 1;
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}
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r = archive_write_header(a, entry);
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if (r < ARCHIVE_OK) {
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errmsg(": ");
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errmsg(archive_error_string(a));
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needcr = 1;
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}
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if (r == ARCHIVE_FATAL) exit(1);
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if (r > ARCHIVE_FAILED) {
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static char buff[16384];
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fd = open(archive_entry_sourcepath(entry), O_RDONLY);
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len = read(fd, buff, sizeof(buff));
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while (len > 0) {
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archive_write_data(a, buff, len);
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len = read(fd, buff, sizeof(buff));
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}
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close(fd);
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}
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archive_entry_free(entry);
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if (needcr) msg("\n");
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}
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archive_read_close(disk);
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archive_read_free(disk);
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argv++;
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}
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archive_write_close(a);
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archive_write_free(a);
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}
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#endif
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void extract(const char* filename, int do_extract, int flags, int verbose) {
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struct archive* a;
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struct archive* ext;
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struct archive_entry* entry;
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int r;
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a = archive_read_new();
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ext = archive_write_disk_new();
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archive_write_disk_set_options(ext, flags);
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#ifndef NO_BZIP2_EXTRACT
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archive_read_support_filter_bzip2(a);
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#endif
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#ifndef NO_GZIP_EXTRACT
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archive_read_support_filter_gzip(a);
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#endif
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#ifndef NO_COMPRESS_EXTRACT
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archive_read_support_filter_compress(a);
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#endif
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#ifndef NO_TAR_EXTRACT
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archive_read_support_format_tar(a);
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#endif
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#ifndef NO_CPIO_EXTRACT
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archive_read_support_format_cpio(a);
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#endif
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#ifndef NO_LOOKUP
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archive_write_disk_set_standard_lookup(ext);
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#endif
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if (filename != NULL && strcmp(filename, "-") == 0) filename = NULL;
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if ((r = archive_read_open_filename(a, filename, 10240))) {
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errmsg(archive_error_string(a));
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errmsg("\n");
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exit(r);
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}
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for (;;) {
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int needcr = 0;
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r = archive_read_next_header(a, &entry);
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if (r == ARCHIVE_EOF) break;
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if (r != ARCHIVE_OK) {
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errmsg(archive_error_string(a));
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errmsg("\n");
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exit(1);
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}
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if (verbose && do_extract) msg("x ");
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if (verbose || !do_extract) {
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std::cout << archive_entry_pathname(entry) << std::endl;
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msg(" ");
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needcr = 1;
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}
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if (do_extract) {
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r = archive_write_header(ext, entry);
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if (r != ARCHIVE_OK) {
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errmsg(archive_error_string(a));
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needcr = 1;
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} else {
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r = copy_data(a, ext);
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if (r != ARCHIVE_OK) needcr = 1;
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}
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}
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if (needcr) msg("\n");
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}
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archive_read_close(a);
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archive_read_free(a);
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archive_write_close(ext);
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archive_write_free(ext);
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}
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int copy_data(struct archive* ar, struct archive* aw) {
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int r;
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const void* buff;
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size_t size;
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int64_t offset;
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for (;;) {
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r = archive_read_data_block(ar, &buff, &size, &offset);
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if (r == ARCHIVE_EOF) return (ARCHIVE_OK);
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if (r != ARCHIVE_OK) {
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errmsg(archive_error_string(ar));
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return (r);
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}
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r = archive_write_data_block(aw, buff, size, offset);
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if (r != ARCHIVE_OK) {
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errmsg(archive_error_string(ar));
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return (r);
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}
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}
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}
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void msg(const char* m) { write(1, m, strlen(m)); }
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void errmsg(const char* m) {
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if (m == NULL) {
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m = "Error: No error description provided.\n";
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}
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write(2, m, strlen(m));
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}
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void usage(void) {
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/* Many program options depend on compile options. */
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const char* m =
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"Usage: minitar [-"
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#ifndef NO_CREATE
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"c"
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#endif
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#ifndef NO_BZIP2
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"j"
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#endif
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"tvx"
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#ifndef NO_BZIP2
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"y"
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#endif
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#ifndef NO_COMPRESS
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"Z"
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#endif
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#ifndef NO_GZIP
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"z"
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#endif
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"] [-f file] [file]\n";
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errmsg(m);
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exit(1);
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}
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// clang-format on
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