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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* bzip2.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "../internal.h"
#include <bzlib.h>
typedef struct {
ostream_comp_t base;
bz_stream strm;
} ostream_bzip2_t;
static int flush_inbuf(ostream_comp_t *base, bool finish)
{
ostream_bzip2_t *bzip2 = (ostream_bzip2_t *)base;
size_t have;
int ret;
bzip2->strm.next_in = (char *)base->inbuf;
if (base->inbuf_used > sizeof(base->inbuf))
base->inbuf_used = sizeof(base->inbuf);
if ((sizeof(size_t) > sizeof(unsigned int)) &&
(base->inbuf_used > (size_t)UINT_MAX)) {
bzip2->strm.avail_in = UINT_MAX;
} else {
bzip2->strm.avail_in = (unsigned int)base->inbuf_used;
}
for (;;) {
bzip2->strm.next_out = (char *)base->outbuf;
bzip2->strm.avail_out = sizeof(base->outbuf);
ret = BZ2_bzCompress(&bzip2->strm, finish ? BZ_FINISH : BZ_RUN);
if (ret < 0 && ret != BZ_OUTBUFF_FULL) {
fprintf(stderr, "%s: internal error in bzip2 "
"compressor.\n",
base->wrapped->get_filename(base->wrapped));
return -1;
}
have = sizeof(base->outbuf) - bzip2->strm.avail_out;
if (base->wrapped->append(base->wrapped, base->outbuf, have))
return -1;
if (ret == BZ_STREAM_END || ret == BZ_OUTBUFF_FULL ||
bzip2->strm.avail_in == 0) {
break;
}
}
if (bzip2->strm.avail_in > 0) {
memmove(base->inbuf, bzip2->strm.next_in,
bzip2->strm.avail_in);
}
base->inbuf_used = bzip2->strm.avail_in;
return 0;
}
static void cleanup(ostream_comp_t *base)
{
ostream_bzip2_t *bzip2 = (ostream_bzip2_t *)base;
BZ2_bzCompressEnd(&bzip2->strm);
}
ostream_comp_t *ostream_bzip2_create(const char *filename)
{
ostream_bzip2_t *bzip2 = calloc(1, sizeof(*bzip2));
ostream_comp_t *base = (ostream_comp_t *)bzip2;
if (bzip2 == NULL) {
fprintf(stderr, "%s: creating bzip2 compressor: %s.\n",
filename, strerror(errno));
return NULL;
}
if (BZ2_bzCompressInit(&bzip2->strm, 9, 0, 30) != BZ_OK) {
fprintf(stderr, "%s: error initializing bzip2 compressor.\n",
filename);
free(bzip2);
return NULL;
}
base->flush_inbuf = flush_inbuf;
base->cleanup = cleanup;
return base;
}
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