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rpm2cpio: use rpm_gettags

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function                                             old     new   delta
rpm_gettags                                            -     451    +451
rpm2cpio_main                                        140      78     -62
skip_header                                           92       -     -92
rpm_main                                            1477    1049    -428
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 0/2 up/down: 451/-582)         Total: -131 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-08-10 09:56:49 +02:00
parent e5650a40d4
commit 3c9b8fe252
1 changed files with 10 additions and 44 deletions
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54
archival/rpm.c
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@ -124,7 +124,13 @@ static int rpm_gettags(const char *filename)
unsigned pass, idx;
unsigned storepos;
fd = xopen(filename, O_RDONLY);
if (!filename) { /* rpm2cpio w/o filename? */
filename = bb_msg_standard_output;
fd = 0;
} else {
fd = xopen(filename, O_RDONLY);
}
storepos = xlseek(fd, 96, SEEK_CUR); /* Seek past the unused lead */
G.tagcount = 0;
tags = NULL;
@ -500,55 +506,15 @@ int rpm_main(int argc, char **argv)
//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;
int rpm_fd;
if (argv[1]) {
xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
}
xread(rpm_fd, &lead, sizeof(lead));
G.pagesize = getpagesize();
/* 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();
rpm_fd = rpm_gettags(argv[1]);
//if (SEAMLESS_COMPRESSION) - we do this at the end instead.
// /* We need to know whether child (gzip/bzip/etc) exits abnormally */