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rpm: prepare rpm_gettags for reuse in rpm2cpio

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2017-08-10 09:41:57 +02:00
parent 3fa9262dcd
commit e5650a40d4
1 changed files with 9 additions and 11 deletions
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20
archival/rpm.c
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@@ -117,14 +117,15 @@ static void extract_cpio(int fd, const char *source_rpm)
continue;
}
static rpm_index *rpm_gettags(int fd)
static int rpm_gettags(const char *filename)
{
rpm_index *tags;
int fd;
unsigned pass, idx;
unsigned storepos;
fd = xopen(filename, O_RDONLY);
storepos = xlseek(fd, 96, SEEK_CUR); /* Seek past the unused lead */
G.tagcount = 0;
tags = NULL;
idx = 0;
@@ -135,13 +136,13 @@ static rpm_index *rpm_gettags(int fd)
xread(fd, &header, sizeof(header));
if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER))
return NULL; /* Invalid magic, or not version 1 */
bb_error_msg_and_die("invalid RPM header magic in '%s'", filename);
header.size = ntohl(header.size);
cnt = ntohl(header.entries);
storepos += sizeof(header) + cnt * 16;
G.tagcount += cnt;
tags = xrealloc(tags, G.tagcount * sizeof(tags[0]));
tags = xrealloc(tags, sizeof(tags[0]) * G.tagcount);
xread(fd, &tags[idx], sizeof(tags[0]) * cnt);
while (cnt--) {
rpm_index *tag = &tags[idx];
@@ -160,6 +161,7 @@ static rpm_index *rpm_gettags(int fd)
/* Seek past store */
storepos = xlseek(fd, header.size, SEEK_CUR);
}
G.mytags = tags;
/* Map the store */
storepos = (storepos + G.pagesize) & -(int)G.pagesize;
@@ -168,9 +170,9 @@ static rpm_index *rpm_gettags(int fd)
/* some NOMMU systems prefer MAP_PRIVATE over MAP_SHARED */
G.map = mmap(0, storepos, PROT_READ, MAP_PRIVATE, fd, 0);
if (G.map == MAP_FAILED)
return NULL; /* error */
bb_perror_msg_and_die("mmap '%s'", filename);
return tags;
return fd;
}
static int bsearch_rpmtag(const void *key, const void *item)
@@ -383,11 +385,7 @@ int rpm_main(int argc, char **argv)
int rpm_fd;
const char *source_rpm;
rpm_fd = xopen(*argv, O_RDONLY);
G.mytags = rpm_gettags(rpm_fd);
if (!G.mytags)
bb_error_msg_and_die("error reading rpm header from '%s'", *argv);
rpm_fd = rpm_gettags(*argv);
print_all_tags();
source_rpm = rpm_getstr0(TAG_SOURCERPM);