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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 {
istream_comp_t base;
ZSTD_DStream* strm;
} istream_zstd_t;
static int precache(istream_t *base)
{
istream_zstd_t *zstd = (istream_zstd_t *)base;
istream_t *wrapped = ((istream_comp_t *)base)->wrapped;
ZSTD_outBuffer out;
ZSTD_inBuffer in;
size_t ret;
if (istream_precache(wrapped))
return -1;
memset(&in, 0, sizeof(in));
memset(&out, 0, sizeof(out));
in.src = wrapped->buffer;
in.size = wrapped->buffer_used;
out.dst = ((istream_comp_t *)base)->uncompressed + base->buffer_used;
out.size = BUFSZ - base->buffer_used;
ret = ZSTD_decompressStream(zstd->strm, &out, &in);
if (ZSTD_isError(ret)) {
fprintf(stderr, "%s: error in zstd decoder.\n",
wrapped->get_filename(wrapped));
return -1;
}
wrapped->buffer_offset = in.pos;
base->buffer_used += out.pos;
return 0;
}
static void cleanup(istream_comp_t *base)
{
istream_zstd_t *zstd = (istream_zstd_t *)base;
ZSTD_freeDStream(zstd->strm);
}
istream_comp_t *istream_zstd_create(const char *filename)
{
istream_zstd_t *zstd = calloc(1, sizeof(*zstd));
istream_comp_t *base = (istream_comp_t *)zstd;
if (zstd == NULL) {
fprintf(stderr, "%s: creating zstd decoder: %s.\n",
filename, strerror(errno));
return NULL;
}
zstd->strm = ZSTD_createDStream();
if (zstd->strm == NULL) {
fprintf(stderr, "%s: error creating zstd decoder.\n",
filename);
free(zstd);
return NULL;
}
((istream_t *)base)->precache = precache;
base->cleanup = cleanup;
return base;
}
#endif /* HAVE_ZSTD_STREAM */
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