static off_t
unxz(int i, int o, char *pre, size_t prelen, off_t *bytes_in)
{
lzma_stream strm = LZMA_STREAM_INIT;
static const int flags = LZMA_TELL_UNSUPPORTED_CHECK|LZMA_CONCATENATED;
lzma_ret ret;
lzma_action action = LZMA_RUN;
off_t bytes_out, bp;
uint8_t ibuf[BUFSIZ];
uint8_t obuf[BUFSIZ];
if (bytes_in == NULL)
bytes_in = &bp;
strm.next_in = ibuf;
memcpy(ibuf, pre, prelen);
strm.avail_in = read(i, ibuf + prelen, sizeof(ibuf) - prelen);
if (strm.avail_in == (size_t)-1)
maybe_err("read failed");
strm.avail_in += prelen;
*bytes_in = strm.avail_in;
if ((ret = lzma_stream_decoder(&strm, UINT64_MAX, flags)) != LZMA_OK)
maybe_errx("Can't initialize decoder (%d)", ret);
strm.next_out = NULL;
strm.avail_out = 0;
if ((ret = lzma_code(&strm, LZMA_RUN)) != LZMA_OK)
maybe_errx("Can't read headers (%d)", ret);
bytes_out = 0;
strm.next_out = obuf;
strm.avail_out = sizeof(obuf);
for (;;) {
if (strm.avail_in == 0) {
strm.next_in = ibuf;
strm.avail_in = read(i, ibuf, sizeof(ibuf));
switch (strm.avail_in) {
case (size_t)-1:
maybe_err("read failed");
/*NOTREACHED*/
case 0:
action = LZMA_FINISH;
break;
default:
*bytes_in += strm.avail_in;
break;
}
}
ret = lzma_code(&strm, action);
// Write and check write error before checking decoder error.
// This way as much data as possible gets written to output
// even if decoder detected an error.
if (strm.avail_out == 0 || ret != LZMA_OK) {
const size_t write_size = sizeof(obuf) - strm.avail_out;
if (write(o, obuf, write_size) != (ssize_t)write_size)
maybe_err("write failed");
strm.next_out = obuf;
strm.avail_out = sizeof(obuf);
bytes_out += write_size;
}
if (ret != LZMA_OK) {
if (ret == LZMA_STREAM_END) {
// Check that there's no trailing garbage.
if (strm.avail_in != 0 || read(i, ibuf, 1))
ret = LZMA_DATA_ERROR;
else {
lzma_end(&strm);
return bytes_out;
}
}
const char *msg;
switch (ret) {
case LZMA_MEM_ERROR:
msg = strerror(ENOMEM);
break;
case LZMA_FORMAT_ERROR:
msg = "File format not recognized";
break;
case LZMA_OPTIONS_ERROR:
// FIXME: Better message?
msg = "Unsupported compression options";
break;
case LZMA_DATA_ERROR:
msg = "File is corrupt";
break;
case LZMA_BUF_ERROR:
msg = "Unexpected end of input";
break;
case LZMA_MEMLIMIT_ERROR:
msg = "Reached memory limit";
break;
default:
maybe_errx("Unknown error (%d)", ret);
break;
}
maybe_errx("%s", msg);
}
}
}
static off_t
unbzip2(int in, int out, char *pre, size_t prelen, off_t *bytes_in)
{
int ret, end_of_file, cold = 0;
off_t bytes_out = 0;
bz_stream bzs;
static char *inbuf, *outbuf;
if (inbuf == NULL)
inbuf = malloc(BUFLEN);
if (outbuf == NULL)
outbuf = malloc(BUFLEN);
if (inbuf == NULL || outbuf == NULL)
maybe_err("malloc");
bzs.bzalloc = NULL;
bzs.bzfree = NULL;
bzs.opaque = NULL;
end_of_file = 0;
ret = BZ2_bzDecompressInit(&bzs, 0, 0);
if (ret != BZ_OK)
maybe_errx("bzip2 init");
/* Prepend. */
bzs.avail_in = prelen;
bzs.next_in = pre;
if (bytes_in)
*bytes_in = prelen;
while (ret == BZ_OK) {
if (bzs.avail_in == 0 && !end_of_file) {
ssize_t n;
n = read(in, inbuf, BUFLEN);
if (n < 0)
maybe_err("read");
if (n == 0)
end_of_file = 1;
bzs.next_in = inbuf;
bzs.avail_in = n;
if (bytes_in)
*bytes_in += n;
}
bzs.next_out = outbuf;
bzs.avail_out = BUFLEN;
ret = BZ2_bzDecompress(&bzs);
switch (ret) {
case BZ_STREAM_END:
case BZ_OK:
if (ret == BZ_OK && end_of_file) {
/*
* If we hit this after a stream end, consider
* it as the end of the whole file and don't
* bail out.
*/
if (cold == 1)
ret = BZ_STREAM_END;
else
maybe_errx("truncated file");
}
cold = 0;
if (!tflag && bzs.avail_out != BUFLEN) {
ssize_t n;
n = write(out, outbuf, BUFLEN - bzs.avail_out);
if (n < 0)
maybe_err("write");
bytes_out += n;
}
if (ret == BZ_STREAM_END && !end_of_file) {
if (BZ2_bzDecompressEnd(&bzs) != BZ_OK ||
BZ2_bzDecompressInit(&bzs, 0, 0) != BZ_OK)
maybe_errx("bzip2 re-init");
cold = 1;
ret = BZ_OK;
}
break;
case BZ_DATA_ERROR:
maybe_warnx("bzip2 data integrity error");
break;
case BZ_DATA_ERROR_MAGIC:
maybe_warnx("bzip2 magic number error");
break;
case BZ_MEM_ERROR:
maybe_warnx("bzip2 out of memory");
break;
default:
maybe_warnx("unknown bzip2 error: %d", ret);
break;
}
}
if (ret != BZ_STREAM_END || BZ2_bzDecompressEnd(&bzs) != BZ_OK)
return (-1);
return (bytes_out);
}
