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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* xz.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "../internal.h"
#include <lzma.h>
typedef struct {
ostream_comp_t base;
lzma_stream strm;
} ostream_xz_t;
static int flush_inbuf(ostream_comp_t *base, bool finish)
{
ostream_xz_t *xz = (ostream_xz_t *)base;
lzma_ret ret_xz;
size_t have;
xz->strm.next_in = base->inbuf;
xz->strm.avail_in = base->inbuf_used;
do {
xz->strm.next_out = base->outbuf;
xz->strm.avail_out = BUFSZ;
ret_xz = lzma_code(&xz->strm, finish ? LZMA_FINISH : LZMA_RUN);
if ((ret_xz != LZMA_OK) && (ret_xz != LZMA_STREAM_END)) {
fprintf(stderr,
"%s: internal error in XZ compressor.\n",
base->wrapped->get_filename(base->wrapped));
return -1;
}
have = BUFSZ - xz->strm.avail_out;
if (base->wrapped->append(base->wrapped, base->outbuf, have))
return -1;
} while (xz->strm.avail_out == 0);
base->inbuf_used = 0;
return 0;
}
static void cleanup(ostream_comp_t *base)
{
ostream_xz_t *xz = (ostream_xz_t *)base;
lzma_end(&xz->strm);
}
ostream_comp_t *ostream_xz_create(const char *filename)
{
ostream_xz_t *xz = calloc(1, sizeof(*xz));
ostream_comp_t *base = (ostream_comp_t *)xz;
lzma_ret ret_xz;
if (xz == NULL) {
fprintf(stderr, "%s: creating xz wrapper: %s.\n",
filename, strerror(errno));
return NULL;
}
ret_xz = lzma_easy_encoder(&xz->strm, LZMA_PRESET_DEFAULT,
LZMA_CHECK_CRC64);
if (ret_xz != LZMA_OK) {
fprintf(stderr, "%s: error initializing XZ compressor\n",
filename);
free(xz);
return NULL;
}
base->flush_inbuf = flush_inbuf;
base->cleanup = cleanup;
return base;
}
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