| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini rpm2cpio implementation for busybox |
| * |
| * Copyright (C) 2001 by Laurence Anderson |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| #include "libbb.h" |
| #include "unarchive.h" |
| #include "rpm.h" |
| |
| 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 0 |
| /* This works, but doesn't report uncompress errors (they happen in child) */ |
| setup_unzip_on_fd(rpm_fd /*fail_if_not_detected: 1*/); |
| if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0) |
| bb_error_msg_and_die("error unpacking"); |
| #else |
| /* BLOAT */ |
| { |
| union { |
| uint8_t b[4]; |
| uint16_t b16[2]; |
| uint32_t b32[1]; |
| } magic; |
| IF_DESKTOP(long long) int FAST_FUNC (*unpack)(int src_fd, int dst_fd); |
| |
| xread(rpm_fd, magic.b16, sizeof(magic.b16[0])); |
| if (magic.b16[0] == GZIP_MAGIC) { |
| unpack = unpack_gz_stream; |
| } else |
| if (ENABLE_FEATURE_SEAMLESS_BZ2 |
| && magic.b16[0] == BZIP2_MAGIC |
| ) { |
| unpack = unpack_bz2_stream; |
| } else |
| if (ENABLE_FEATURE_SEAMLESS_XZ |
| && magic.b16[0] == XZ_MAGIC1 |
| ) { |
| xread(rpm_fd, magic.b32, sizeof(magic.b32[0])); |
| if (magic.b32[0] != XZ_MAGIC2) |
| goto no_magic; |
| /* unpack_xz_stream wants fd at position 6, no need to seek */ |
| //xlseek(rpm_fd, -6, SEEK_CUR); |
| unpack = unpack_xz_stream; |
| } else { |
| no_magic: |
| bb_error_msg_and_die("no gzip" |
| IF_FEATURE_SEAMLESS_BZ2("/bzip2") |
| IF_FEATURE_SEAMLESS_XZ("/xz") |
| " magic"); |
| } |
| if (unpack(rpm_fd, STDOUT_FILENO) < 0) |
| bb_error_msg_and_die("error unpacking"); |
| } |
| #endif |
| |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| close(rpm_fd); |
| } |
| |
| return 0; |
| } |