From 833d4e7f84f59099ee66eabfa3457ebb7d37eaa8 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Wed, 3 Nov 2010 02:38:31 +0100 Subject: rename archival/libunarchive -> archival/libarchive; move bz/ into it Signed-off-by: Denys Vlasenko --- archival/libarchive/get_header_tar_gz.c | 36 +++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 archival/libarchive/get_header_tar_gz.c (limited to 'archival/libarchive/get_header_tar_gz.c') diff --git a/archival/libarchive/get_header_tar_gz.c b/archival/libarchive/get_header_tar_gz.c new file mode 100644 index 0000000..b09f869 --- /dev/null +++ b/archival/libarchive/get_header_tar_gz.c @@ -0,0 +1,36 @@ +/* vi: set sw=4 ts=4: */ +/* + * Licensed under GPLv2 or later, see file LICENSE in this source tree. + */ + +#include "libbb.h" +#include "archive.h" + +char FAST_FUNC get_header_tar_gz(archive_handle_t *archive_handle) +{ +#if BB_MMU + unsigned char magic[2]; +#endif + + /* Can't lseek over pipes */ + archive_handle->seek = seek_by_read; + + /* Check gzip magic only if open_transformer will invoke unpack_gz_stream (MMU case). + * Otherwise, it will invoke an external helper "gunzip -cf" (NOMMU case) which will + * need the header. */ +#if BB_MMU + xread(archive_handle->src_fd, &magic, 2); + /* Can skip this check, but error message will be less clear */ + if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) { + bb_error_msg_and_die("invalid gzip magic"); + } +#endif + + open_transformer(archive_handle->src_fd, unpack_gz_stream, "gunzip"); + archive_handle->offset = 0; + while (get_header_tar(archive_handle) == EXIT_SUCCESS) + continue; + + /* Can only do one file at a time */ + return EXIT_FAILURE; +} -- cgit v1.1