1 files changed, 96 insertions, 1 deletions

diff --git a/archival/rpm.c b/archival/rpm.c
index 89b36dd..bb6cc45 100644
--- a/archival/rpm.c
+++ b/archival/rpm.c
@@ -6,7 +6,6 @@
  *
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
-
 //config:config RPM
 //config:	bool "rpm (33 kb)"
 //config:	default y
@@ -14,6 +13,7 @@
 //config:	Mini RPM applet - queries and extracts RPM packages.
 
 //applet:IF_RPM(APPLET(rpm, BB_DIR_BIN, BB_SUID_DROP))
+
 //kbuild:lib-$(CONFIG_RPM) += rpm.o
 
 #include "libbb.h"
@@ -479,3 +479,98 @@ int rpm_main(int argc, char **argv)
 
 	return 0;
 }
+
+/*
+ * Mini rpm2cpio implementation for busybox
+ *
+ * Copyright (C) 2001 by Laurence Anderson
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+//config:config RPM2CPIO
+//config:	bool "rpm2cpio (20 kb)"
+//config:	default y
+//config:	help
+//config:	Converts a RPM file into a CPIO archive.
+
+//applet:IF_RPM2CPIO(APPLET(rpm2cpio, BB_DIR_USR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_RPM2CPIO) += rpm.o
+
+//usage:#define rpm2cpio_trivial_usage
+//usage:       "PACKAGE.rpm"
+//usage:#define rpm2cpio_full_usage "\n\n"
+//usage:       "Output a cpio archive of the rpm file"
+
+enum { rpm_fd = STDIN_FILENO };
+
+static unsigned skip_header(void)
+{
+	struct rpm_header header;
+	unsigned len;
+
+	xread(rpm_fd, &header, sizeof(header));
+//	if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
+//		bb_error_msg_and_die("invalid RPM header magic");
+//	}
+//	if (header.version != 1) {
+//		bb_error_msg_and_die("unsupported RPM header version");
+//	}
+	if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
+		bb_error_msg_and_die("invalid RPM header magic or unsupported version");
+		// ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
+	}
+
+	/* Seek past index entries, and past store */
+	len = 16 * ntohl(header.entries) + ntohl(header.size);
+	seek_by_jump(rpm_fd, len);
+
+	return sizeof(header) + len;
+}
+
+/* No getopt required */
+int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
+{
+	struct rpm_lead lead;
+	unsigned pos;
+
+	if (argv[1]) {
+		xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
+	}
+	xread(rpm_fd, &lead, sizeof(lead));
+
+	/* Just check the magic, the rest is irrelevant */
+	if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
+		bb_error_msg_and_die("invalid RPM magic");
+	}
+
+	/* Skip the signature header, align to 8 bytes */
+	pos = skip_header();
+	seek_by_jump(rpm_fd, (-(int)pos) & 7);
+
+	/* Skip the main header */
+	skip_header();
+
+	//if (SEAMLESS_COMPRESSION) - we do this at the end instead.
+	//	/* We need to know whether child (gzip/bzip/etc) exits abnormally */
+	//	signal(SIGCHLD, check_errors_in_children);
+
+//TODO: look for rpm tag RPMTAG_PAYLOADCOMPRESSOR (dec 1125, hex 0x465),
+// if the value is "lzma", set up decompressor without detection
+// (lzma can't be detected).
+
+	setup_unzip_on_fd(rpm_fd, /*fail_if_not_compressed:*/ 1);
+	if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0)
+		bb_error_msg_and_die("error unpacking");
+
+	if (ENABLE_FEATURE_CLEAN_UP) {
+		close(rpm_fd);
+	}
+
+	if (SEAMLESS_COMPRESSION) {
+		check_errors_in_children(0);
+		return bb_got_signal;
+	}
+	return EXIT_SUCCESS;
+}