0a130d510d
function old new delta data_skip 14 20 +6 seek_by_jump 67 72 +5 data_align 81 84 +3 seek_by_read 20 19 -1 skip_header 99 94 -5 rpm2cpio_main 183 177 -6 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/3 up/down: 14/-12) Total: 2 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini rpm2cpio implementation for busybox
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*
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* Copyright (C) 2001 by Laurence Anderson
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#include "unarchive.h"
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#define RPM_MAGIC 0xedabeedb
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#define RPM_MAGIC_STR "\355\253\356\333"
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struct rpm_lead {
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uint32_t magic;
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uint8_t major, minor;
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uint16_t type;
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uint16_t archnum;
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char name[66];
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uint16_t osnum;
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uint16_t signature_type;
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char reserved[16];
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};
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#define RPM_HEADER_VERnMAGIC 0x8eade801
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#define RPM_HEADER_MAGIC_STR "\216\255\350"
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struct rpm_header {
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uint32_t magic_and_ver; /* 3 byte magic: 0x8e 0xad 0xe8; 1 byte version */
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uint32_t reserved; /* 4 bytes reserved */
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uint32_t entries; /* Number of entries in header (4 bytes) */
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uint32_t size; /* Size of store (4 bytes) */
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};
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static unsigned skip_header(int rpm_fd)
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{
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struct rpm_header header;
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unsigned len;
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xread(rpm_fd, &header, sizeof(header));
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// if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
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// bb_error_msg_and_die("invalid RPM header magic");
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// }
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// if (header.version != 1) {
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// bb_error_msg_and_die("unsupported RPM header version");
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// }
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if (header.magic_and_ver != htonl(RPM_HEADER_VERnMAGIC)) {
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bb_error_msg_and_die("invalid RPM header magic or unsupported version");
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// ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_VERnMAGIC));
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}
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/* Seek past index entries, and past store */
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len = 16 * ntohl(header.entries) + ntohl(header.size);
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seek_by_jump(rpm_fd, len);
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return sizeof(header) + len;
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}
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/* No getopt required */
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int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
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{
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struct rpm_lead lead;
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int rpm_fd;
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unsigned pos;
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unsigned char magic[2];
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IF_DESKTOP(long long) int FAST_FUNC (*unpack)(int src_fd, int dst_fd);
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if (!argv[1]) {
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rpm_fd = STDIN_FILENO;
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} else {
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rpm_fd = xopen(argv[1], O_RDONLY);
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}
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xread(rpm_fd, &lead, sizeof(lead));
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/* Just check the magic, the rest is irrelevant */
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if (lead.magic != htonl(RPM_MAGIC)) {
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bb_error_msg_and_die("invalid RPM magic");
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}
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/* Skip the signature header, align to 8 bytes */
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pos = skip_header(rpm_fd);
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seek_by_jump(rpm_fd, (8 - pos) & 7);
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/* Skip the main header */
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skip_header(rpm_fd);
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xread(rpm_fd, &magic, 2);
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unpack = unpack_gz_stream;
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if (magic[0] != 0x1f || magic[1] != 0x8b) {
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if (!ENABLE_FEATURE_SEAMLESS_BZ2
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|| magic[0] != 'B' || magic[1] != 'Z'
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) {
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bb_error_msg_and_die("invalid gzip"
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IF_FEATURE_SEAMLESS_BZ2("/bzip2")
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" magic");
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}
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unpack = unpack_bz2_stream;
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}
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if (unpack(rpm_fd, STDOUT_FILENO) < 0) {
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bb_error_msg_and_die("error unpacking");
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}
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(rpm_fd);
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}
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return 0;
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}
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