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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* zstd.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "../internal.h"
#include <zstd.h>
#ifdef HAVE_ZSTD_STREAM
typedef struct {
ostream_comp_t base;
ZSTD_CStream *strm;
} ostream_zstd_t;
static int flush_inbuf(ostream_comp_t *base, bool finish)
{
ostream_zstd_t *zstd = (ostream_zstd_t *)base;
ZSTD_EndDirective op;
ZSTD_outBuffer out;
ZSTD_inBuffer in;
size_t ret;
op = finish ? ZSTD_e_end : ZSTD_e_continue;
do {
memset(&in, 0, sizeof(in));
memset(&out, 0, sizeof(out));
in.src = base->inbuf;
in.size = base->inbuf_used;
out.dst = base->outbuf;
out.size = BUFSZ;
ret = ZSTD_compressStream2(zstd->strm, &out, &in, op);
if (ZSTD_isError(ret)) {
fprintf(stderr, "%s: error in zstd compressor.\n",
base->wrapped->get_filename(base->wrapped));
return -1;
}
if (base->wrapped->append(base->wrapped, base->outbuf,
out.pos)) {
return -1;
}
if (in.pos < in.size) {
base->inbuf_used = in.size - in.pos;
memmove(base->inbuf, base->inbuf + in.pos,
base->inbuf_used);
} else {
base->inbuf_used = 0;
}
} while (finish && ret != 0);
return 0;
}
static void cleanup(ostream_comp_t *base)
{
ostream_zstd_t *zstd = (ostream_zstd_t *)base;
ZSTD_freeCStream(zstd->strm);
}
ostream_comp_t *ostream_zstd_create(const char *filename)
{
ostream_zstd_t *zstd = calloc(1, sizeof(*zstd));
ostream_comp_t *base = (ostream_comp_t *)zstd;
if (zstd == NULL) {
fprintf(stderr, "%s: creating zstd wrapper: %s.\n",
filename, strerror(errno));
return NULL;
}
zstd->strm = ZSTD_createCStream();
if (zstd->strm == NULL) {
fprintf(stderr, "%s: error creating zstd decoder.\n",
filename);
free(zstd);
return NULL;
}
base->flush_inbuf = flush_inbuf;
base->cleanup = cleanup;
return base;
}
#endif /* HAVE_ZSTD_STREAM */
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