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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* zstd.c
*
* Copyright (C) 2021 David Oberhollenzer <goliath@infraroot.at>
*/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <zstd.h>
#include "xfrm/stream.h"
#include "xfrm/compress.h"
typedef struct {
xfrm_stream_t base;
ZSTD_CStream *cstrm;
ZSTD_DStream *dstrm;
bool compress;
} xfrm_zstd_t;
static const ZSTD_EndDirective zstd_action[] = {
[XFRM_STREAM_FLUSH_NONE] = ZSTD_e_continue,
[XFRM_STREAM_FLUSH_SYNC] = ZSTD_e_flush,
[XFRM_STREAM_FLUSH_FULL] = ZSTD_e_end,
};
static int process_data(xfrm_stream_t *stream, const void *in,
sqfs_u32 in_size, void *out, sqfs_u32 out_size,
sqfs_u32 *in_read, sqfs_u32 *out_written,
int flush_mode)
{
xfrm_zstd_t *zstd = (xfrm_zstd_t *)stream;
ZSTD_outBuffer out_desc;
ZSTD_inBuffer in_desc;
size_t ret;
if (flush_mode < 0 || flush_mode >= XFRM_STREAM_FLUSH_COUNT)
flush_mode = XFRM_STREAM_FLUSH_NONE;
while (in_size > 0 && out_size > 0) {
memset(&in_desc, 0, sizeof(in_desc));
in_desc.src = in;
in_desc.size = in_size;
memset(&out_desc, 0, sizeof(out_desc));
out_desc.dst = out;
out_desc.size = out_size;
if (zstd->compress) {
ret = ZSTD_compressStream2(zstd->cstrm, &out_desc,
&in_desc,
zstd_action[flush_mode]);
} else {
ret = ZSTD_decompressStream(zstd->dstrm, &out_desc,
&in_desc);
}
if (ZSTD_isError(ret))
return XFRM_STREAM_ERROR;
in = (const char *)in + in_desc.pos;
in_size -= in_desc.pos;
*in_read += in_desc.pos;
out = (char *)out + out_desc.pos;
out_size -= out_desc.pos;
*out_written += out_desc.pos;
}
if (flush_mode != XFRM_STREAM_FLUSH_NONE) {
if (in_size == 0)
return XFRM_STREAM_END;
}
if (in_size > 0 && out_size == 0)
return XFRM_STREAM_BUFFER_FULL;
return XFRM_STREAM_OK;
}
static void destroy(sqfs_object_t *obj)
{
xfrm_zstd_t *zstd = (xfrm_zstd_t *)obj;
if (zstd->compress) {
ZSTD_freeCStream(zstd->cstrm);
} else {
ZSTD_freeDStream(zstd->dstrm);
}
free(zstd);
}
static xfrm_stream_t *stream_create(const compressor_config_t *cfg,
bool compress)
{
xfrm_zstd_t *zstd = calloc(1, sizeof(*zstd));
xfrm_stream_t *strm = (xfrm_stream_t *)zstd;
(void)cfg;
if (zstd == NULL) {
perror("creating zstd stream compressor");
return NULL;
}
if (compress) {
zstd->cstrm = ZSTD_createCStream();
if (zstd->cstrm == NULL)
goto fail_strm;
} else {
zstd->dstrm = ZSTD_createDStream();
if (zstd->dstrm == NULL)
goto fail_strm;
}
zstd->compress = compress;
strm->process_data = process_data;
sqfs_object_init(zstd, destroy, NULL);
return strm;
fail_strm:
fputs("error initializing zstd stream.\n", stderr);
free(zstd);
return NULL;
}
xfrm_stream_t *compressor_stream_zstd_create(const compressor_config_t *cfg)
{
return stream_create(cfg, true);
}
xfrm_stream_t *decompressor_stream_zstd_create(void)
{
return stream_create(NULL, false);
}
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