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90 lines
2.3 KiB
C
90 lines
2.3 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 "\355\253\356\333"
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#define RPM_HEADER_MAGIC "\216\255\350"
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struct rpm_lead {
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unsigned char magic[4];
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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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struct rpm_header {
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char magic[3]; /* 3 byte magic: 0x8e 0xad 0xe8 */
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uint8_t version; /* 1 byte version number */
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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 void skip_header(int rpm_fd)
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{
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struct rpm_header header;
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xread(rpm_fd, &header, sizeof(struct rpm_header));
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if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC, 3) != 0) {
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bb_error_msg_and_die("invalid RPM header magic"); /* Invalid 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"); /* This program only supports v1 headers */
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}
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header.entries = ntohl(header.entries);
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header.size = ntohl(header.size);
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lseek (rpm_fd, 16 * header.entries, SEEK_CUR); /* Seek past index entries */
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lseek (rpm_fd, header.size, SEEK_CUR); /* Seek past store */
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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, 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 char magic[2];
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if (argc == 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(struct rpm_lead));
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if (strncmp((char *) &lead.magic, RPM_MAGIC, 4) != 0) {
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bb_error_msg_and_die("invalid RPM magic"); /* Just check the magic, the rest is irrelevant */
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}
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/* Skip the signature header */
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skip_header(rpm_fd);
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lseek(rpm_fd, (8 - (lseek(rpm_fd, 0, SEEK_CUR) % 8)) % 8, SEEK_CUR);
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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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if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) {
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bb_error_msg_and_die("invalid gzip magic");
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}
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if (unpack_gz_stream(rpm_fd, STDOUT_FILENO) < 0) {
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bb_error_msg("error inflating");
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}
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close(rpm_fd);
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return 0;
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}
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