abuild/abuild-gzsplit.c
2020-07-08 12:44:40 +02:00

107 lines
2.1 KiB
C

#include <stdio.h>
#include <err.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <zlib.h>
static int find_section(const char *buf, size_t bufsize, const char *str) {
int len = strlen(str);
const char *p;
if (len >= bufsize) return 0;
p = strrchr(buf, '/');
if (p++ == NULL) p = buf;
return strncmp(p, str, len) == 0;
}
int main(void)
{
char obuf[8*1024], ibuf[8*1024];
z_stream zs;
int r = Z_OK, rc = 1, fd = -1;
size_t len;
if (inflateInit2(&zs, 15+32) != Z_OK)
goto err;
zs.avail_out = sizeof obuf;
zs.next_out = (Bytef *)obuf;
while (1) {
const char *fn = NULL;
if (zs.avail_in == 0) {
zs.avail_in = read(STDIN_FILENO, ibuf, sizeof ibuf);
zs.next_in = (Bytef *)ibuf;
if (zs.avail_in < 0) {
warn("Failed to read input");
goto err;
}
if (zs.avail_in == 0 && r == Z_STREAM_END) goto ok;
}
r = inflate(&zs, Z_NO_FLUSH);
if (r != Z_OK && r != Z_STREAM_END) {
warnx("Failed to inflate input");
goto err;
}
len = sizeof obuf - zs.avail_out;
if (len) {
if (fd < 0) {
const char *fn;
if (find_section(obuf, len, ".SIGN."))
fn = "signatures.tar.gz";
else if (find_section(obuf, len, ".PKGINFO"))
fn = "control.tar.gz";
else if (rc == 1)
fn = "data.tar.gz", rc = 2;
else {
warnx("Failed to find .PKGINFO section");
goto err;
}
fd = open(fn, O_CREAT|O_TRUNC|O_WRONLY, 0777);
if (fd < 0) {
warn("Failed to open %s", fn);
goto err;
}
}
zs.next_out = (Bytef *)obuf;
zs.avail_out = sizeof obuf;
}
if (zs.avail_in == 0 || r == Z_STREAM_END) {
len = (void *)zs.next_in - (void *)ibuf;
if (write(fd, ibuf, len) != len) {
warn("Failed to write to %s", fn);
goto err;
}
memmove(ibuf, zs.next_in, zs.avail_in);
zs.next_in = (Bytef *)ibuf;
}
if (r == Z_STREAM_END) {
if (fd >= 0) {
close(fd);
fd = -1;
}
inflateEnd(&zs);
if (inflateInit2(&zs, 15+32) != Z_OK) {
warnx("inflateInit2 failed");
goto err;
}
}
}
ok:
rc = 0;
err:
if (fd >= 0) close(fd);
inflateEnd(&zs);
return rc;
}