NetBSD/usr.bin/gzip/unbzip2.c

76 lines
2.0 KiB
C

/* $NetBSD: unbzip2.c,v 1.1 2004/01/01 02:44:09 mrg Exp $ */
/* This file is #included by gzip.c */
#define INBUFSIZE (64 * 1024)
#define OUTBUFSIZE (64 * 1024)
static off_t
unbzip2(int in, int out)
{
int n, ret, end_of_file;
off_t bytes_out = 0;
bz_stream bzs;
char *inbuf, *outbuf;
if ((inbuf = malloc(INBUFSIZE)) == NULL)
maybe_err(1, "malloc");
if ((outbuf = malloc(OUTBUFSIZE)) == NULL)
maybe_err(1, "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(1, "bzip2 init");
bzs.avail_in = 0;
while (ret != BZ_STREAM_END) {
if (bzs.avail_in == 0 && !end_of_file) {
n = read(in, inbuf, INBUFSIZE);
if (n < 0)
maybe_err(1, "read");
if (n == 0)
end_of_file = 1;
bzs.next_in = inbuf;
bzs.avail_in = n;
} else
n = 0;
bzs.next_out = outbuf;
bzs.avail_out = OUTBUFSIZE;
ret = BZ2_bzDecompress(&bzs);
switch (ret) {
case BZ_STREAM_END:
case BZ_OK:
if (ret == BZ_OK && end_of_file)
maybe_err(1, "read");
if (!tflag) {
n = write(out, outbuf, OUTBUFSIZE - bzs.avail_out);
if (n < 0)
maybe_err(1, "write");
}
bytes_out += n;
if (ret == BZ_STREAM_END)
break;
case BZ_DATA_ERROR:
maybe_errx(1, "bzip2 data integrity error");
case BZ_DATA_ERROR_MAGIC:
maybe_errx(1, "bzip2 magic number error");
case BZ_MEM_ERROR:
maybe_errx(1, "bzip2 out of memory");
}
}
if (BZ2_bzDecompressEnd(&bzs) != BZ_OK)
return (0);
return (bytes_out);
}