1// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
2/*
3 * Copyright (c) Facebook, Inc.
4 * All rights reserved.
5 *
6 * This source code is licensed under both the BSD-style license (found in the
7 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
8 * in the COPYING file in the root directory of this source tree).
9 * You may select, at your option, one of the above-listed licenses.
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/string.h>
15#include <linux/zstd.h>
16
17#include "common/zstd_deps.h"
18#include "common/zstd_internal.h"
19
20#define ZSTD_FORWARD_IF_ERR(ret)            \
21	do {                                \
22		size_t const __ret = (ret); \
23		if (ZSTD_isError(__ret))    \
24			return __ret;       \
25	} while (0)
26
27static size_t zstd_cctx_init(zstd_cctx *cctx, const zstd_parameters *parameters,
28	unsigned long long pledged_src_size)
29{
30	ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_reset(
31		cctx, ZSTD_reset_session_and_parameters));
32	ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setPledgedSrcSize(
33		cctx, pledged_src_size));
34	ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
35		cctx, ZSTD_c_windowLog, parameters->cParams.windowLog));
36	ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
37		cctx, ZSTD_c_hashLog, parameters->cParams.hashLog));
38	ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
39		cctx, ZSTD_c_chainLog, parameters->cParams.chainLog));
40	ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
41		cctx, ZSTD_c_searchLog, parameters->cParams.searchLog));
42	ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
43		cctx, ZSTD_c_minMatch, parameters->cParams.minMatch));
44	ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
45		cctx, ZSTD_c_targetLength, parameters->cParams.targetLength));
46	ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
47		cctx, ZSTD_c_strategy, parameters->cParams.strategy));
48	ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
49		cctx, ZSTD_c_contentSizeFlag, parameters->fParams.contentSizeFlag));
50	ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
51		cctx, ZSTD_c_checksumFlag, parameters->fParams.checksumFlag));
52	ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
53		cctx, ZSTD_c_dictIDFlag, !parameters->fParams.noDictIDFlag));
54	return 0;
55}
56
57int zstd_min_clevel(void)
58{
59	return ZSTD_minCLevel();
60}
61EXPORT_SYMBOL(zstd_min_clevel);
62
63int zstd_max_clevel(void)
64{
65	return ZSTD_maxCLevel();
66}
67EXPORT_SYMBOL(zstd_max_clevel);
68
69size_t zstd_compress_bound(size_t src_size)
70{
71	return ZSTD_compressBound(src_size);
72}
73EXPORT_SYMBOL(zstd_compress_bound);
74
75zstd_parameters zstd_get_params(int level,
76	unsigned long long estimated_src_size)
77{
78	return ZSTD_getParams(level, estimated_src_size, 0);
79}
80EXPORT_SYMBOL(zstd_get_params);
81
82size_t zstd_cctx_workspace_bound(const zstd_compression_parameters *cparams)
83{
84	return ZSTD_estimateCCtxSize_usingCParams(*cparams);
85}
86EXPORT_SYMBOL(zstd_cctx_workspace_bound);
87
88zstd_cctx *zstd_init_cctx(void *workspace, size_t workspace_size)
89{
90	if (workspace == NULL)
91		return NULL;
92	return ZSTD_initStaticCCtx(workspace, workspace_size);
93}
94EXPORT_SYMBOL(zstd_init_cctx);
95
96size_t zstd_compress_cctx(zstd_cctx *cctx, void *dst, size_t dst_capacity,
97	const void *src, size_t src_size, const zstd_parameters *parameters)
98{
99	ZSTD_FORWARD_IF_ERR(zstd_cctx_init(cctx, parameters, src_size));
100	return ZSTD_compress2(cctx, dst, dst_capacity, src, src_size);
101}
102EXPORT_SYMBOL(zstd_compress_cctx);
103
104size_t zstd_cstream_workspace_bound(const zstd_compression_parameters *cparams)
105{
106	return ZSTD_estimateCStreamSize_usingCParams(*cparams);
107}
108EXPORT_SYMBOL(zstd_cstream_workspace_bound);
109
110zstd_cstream *zstd_init_cstream(const zstd_parameters *parameters,
111	unsigned long long pledged_src_size, void *workspace, size_t workspace_size)
112{
113	zstd_cstream *cstream;
114
115	if (workspace == NULL)
116		return NULL;
117
118	cstream = ZSTD_initStaticCStream(workspace, workspace_size);
119	if (cstream == NULL)
120		return NULL;
121
122	/* 0 means unknown in linux zstd API but means 0 in new zstd API */
123	if (pledged_src_size == 0)
124		pledged_src_size = ZSTD_CONTENTSIZE_UNKNOWN;
125
126	if (ZSTD_isError(zstd_cctx_init(cstream, parameters, pledged_src_size)))
127		return NULL;
128
129	return cstream;
130}
131EXPORT_SYMBOL(zstd_init_cstream);
132
133size_t zstd_reset_cstream(zstd_cstream *cstream,
134	unsigned long long pledged_src_size)
135{
136	if (pledged_src_size == 0)
137		pledged_src_size = ZSTD_CONTENTSIZE_UNKNOWN;
138	ZSTD_FORWARD_IF_ERR( ZSTD_CCtx_reset(cstream, ZSTD_reset_session_only) );
139	ZSTD_FORWARD_IF_ERR( ZSTD_CCtx_setPledgedSrcSize(cstream, pledged_src_size) );
140	return 0;
141}
142EXPORT_SYMBOL(zstd_reset_cstream);
143
144size_t zstd_compress_stream(zstd_cstream *cstream, zstd_out_buffer *output,
145	zstd_in_buffer *input)
146{
147	return ZSTD_compressStream(cstream, output, input);
148}
149EXPORT_SYMBOL(zstd_compress_stream);
150
151size_t zstd_flush_stream(zstd_cstream *cstream, zstd_out_buffer *output)
152{
153	return ZSTD_flushStream(cstream, output);
154}
155EXPORT_SYMBOL(zstd_flush_stream);
156
157size_t zstd_end_stream(zstd_cstream *cstream, zstd_out_buffer *output)
158{
159	return ZSTD_endStream(cstream, output);
160}
161EXPORT_SYMBOL(zstd_end_stream);
162
163MODULE_LICENSE("Dual BSD/GPL");
164MODULE_DESCRIPTION("Zstd Compressor");
165