1 files changed, 106 insertions, 0 deletions
diff --git a/busybox/archival/rpm2cpio.c b/busybox/archival/rpm2cpio.c
new file mode 100644
index 0000000..5314e53
--- /dev/null
+++ b/busybox/archival/rpm2cpio.c
@@ -0,0 +1,106 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini rpm2cpio implementation for busybox
+ *
+ * Copyright (C) 2001 by Laurence Anderson
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include <sys/types.h>
+#include <netinet/in.h> /* For ntohl & htonl function */
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include "busybox.h"
+#include "unarchive.h"
+
+#define RPM_MAGIC "\355\253\356\333"
+#define RPM_HEADER_MAGIC "\216\255\350"
+
+struct rpm_lead {
+    unsigned char magic[4];
+    uint8_t major, minor;
+    uint16_t type;
+    uint16_t archnum;
+    char name[66];
+    uint16_t osnum;
+    uint16_t signature_type;
+    char reserved[16];
+};
+
+struct rpm_header {
+	char magic[3]; /* 3 byte magic: 0x8e 0xad 0xe8 */
+	uint8_t version; /* 1 byte version number */
+	uint32_t reserved; /* 4 bytes reserved */
+	uint32_t entries; /* Number of entries in header (4 bytes) */
+	uint32_t size; /* Size of store (4 bytes) */
+};
+
+void skip_header(int rpm_fd)
+{
+	struct rpm_header header;
+
+	bb_xread_all(rpm_fd, &header, sizeof(struct rpm_header));
+	if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC, 3) != 0) {
+		bb_error_msg_and_die("Invalid RPM header magic"); /* Invalid magic */
+	}
+	if (header.version != 1) {
+		bb_error_msg_and_die("Unsupported RPM header version"); /* This program only supports v1 headers */
+	}
+	header.entries = ntohl(header.entries);
+	header.size = ntohl(header.size);
+	lseek (rpm_fd, 16 * header.entries, SEEK_CUR); /* Seek past index entries */
+	lseek (rpm_fd, header.size, SEEK_CUR); /* Seek past store */
+}
+
+/* No getopt required */
+extern int rpm2cpio_main(int argc, char **argv)
+{
+	struct rpm_lead lead;
+	int rpm_fd;
+	unsigned char magic[2];
+
+	if (argc == 1) {
+		rpm_fd = STDIN_FILENO;
+	} else {
+		rpm_fd = bb_xopen(argv[1], O_RDONLY);
+	}
+
+	bb_xread_all(rpm_fd, &lead, sizeof(struct rpm_lead));
+	if (strncmp((char *) &lead.magic, RPM_MAGIC, 4) != 0) {
+		bb_error_msg_and_die("Invalid RPM magic"); /* Just check the magic, the rest is irrelevant */
+	}
+
+	/* Skip the signature header */
+	skip_header(rpm_fd);
+	lseek(rpm_fd, (8 - (lseek(rpm_fd, 0, SEEK_CUR) % 8)) % 8, SEEK_CUR);
+
+	/* Skip the main header */
+	skip_header(rpm_fd);
+
+	bb_xread_all(rpm_fd, &magic, 2);
+	if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) {
+		bb_error_msg_and_die("Invalid gzip magic");
+	}
+
+	check_header_gzip(rpm_fd);
+	if (inflate_gunzip(rpm_fd, STDOUT_FILENO) != 0) {
+		bb_error_msg("Error inflating");
+	}
+
+	close(rpm_fd);
+
+	return 0;
+}