diff options
Diffstat (limited to 'src/tar.c')
| -rw-r--r-- | src/tar.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/src/tar.c b/src/tar.c new file mode 100644 index 0000000..3f2983b --- /dev/null +++ b/src/tar.c @@ -0,0 +1,102 @@ +#include <stdio.h> +#include <stdlib.h> +#include <archive.h> +#include <archive_entry.h> +#include <fcntl.h> + +static int copy_data(struct archive* ar, struct archive* aw) +{ + int r; + const void *buff; + size_t size; + la_int64_t offset; + + for (;;) { + r = archive_read_data_block(ar, &buff, &size, &offset); + if (r == ARCHIVE_EOF) + return (ARCHIVE_OK); + if (r < ARCHIVE_OK) + return (r); + r = archive_write_data_block(aw, buff, size, offset); + if (r < ARCHIVE_OK) { + fprintf(stderr, "%s\n", archive_error_string(aw)); + return (r); + } + } +} + +void extract(const char* filename, const char* outputdir) +{ + char cwd[256]; + getcwd(cwd, sizeof(cwd)); + + if (chdir(outputdir) < 0) + { + fprintf(stderr, "Cannot change to %s\n", outputdir); + return; + } + + struct archive* a; + struct archive* ext; + struct archive_entry* entry; + int flags, r; + + /* Select which attributes we want to restore. */ + flags = ARCHIVE_EXTRACT_TIME; + flags |= ARCHIVE_EXTRACT_PERM; + flags |= ARCHIVE_EXTRACT_ACL; + flags |= ARCHIVE_EXTRACT_FFLAGS; + + a = archive_read_new(); + archive_read_support_format_all(a); + archive_read_support_compression_all(a); + ext = archive_write_disk_new(); + archive_write_disk_set_options(ext, flags); + archive_write_disk_set_standard_lookup(ext); + if ((r = archive_read_open_filename(a, filename, 10240))) return; + + for (;;) + { + r = archive_read_next_header(a, &entry); + if (r == ARCHIVE_EOF) + { + break; + } + + if (r < ARCHIVE_OK) + { + fprintf(stderr, "%s\n", archive_error_string(a)); + } + + if (r < ARCHIVE_WARN) + { + return; + } + + r = archive_write_header(ext, entry); + if (r < ARCHIVE_OK) + { + fprintf(stderr, "%s\n", archive_error_string(ext)); + } + else if (archive_entry_size(entry) > 0) + { + r = copy_data(a, ext); + if (r < ARCHIVE_OK) + fprintf(stderr, "%s\n", archive_error_string(ext)); + if (r < ARCHIVE_WARN) + return; + } + + r = archive_write_finish_entry(ext); + if (r < ARCHIVE_OK) + fprintf(stderr, "%s\n", archive_error_string(ext)); + if (r < ARCHIVE_WARN) + return; + } + archive_read_close(a); + archive_read_free(a); + archive_write_close(ext); + archive_write_free(ext); + + if (cwd != NULL) chdir(cwd); +}
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