1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *  Copyright (C) 2018 Chelsio Communications.  All rights reserved.
4 */
5
6#include <linux/zlib.h>
7
8#include "cxgb4.h"
9#include "cudbg_if.h"
10#include "cudbg_lib_common.h"
11#include "cudbg_zlib.h"
12
13static int cudbg_get_compress_hdr(struct cudbg_buffer *pdbg_buff,
14				  struct cudbg_buffer *pin_buff)
15{
16	if (pdbg_buff->offset + sizeof(struct cudbg_compress_hdr) >
17	    pdbg_buff->size)
18		return CUDBG_STATUS_NO_MEM;
19
20	pin_buff->data = (char *)pdbg_buff->data + pdbg_buff->offset;
21	pin_buff->offset = 0;
22	pin_buff->size = sizeof(struct cudbg_compress_hdr);
23	pdbg_buff->offset += sizeof(struct cudbg_compress_hdr);
24	return 0;
25}
26
27int cudbg_compress_buff(struct cudbg_init *pdbg_init,
28			struct cudbg_buffer *pin_buff,
29			struct cudbg_buffer *pout_buff)
30{
31	struct cudbg_buffer temp_buff = { 0 };
32	struct z_stream_s compress_stream;
33	struct cudbg_compress_hdr *c_hdr;
34	int rc;
35
36	/* Write compression header to output buffer before compression */
37	rc = cudbg_get_compress_hdr(pout_buff, &temp_buff);
38	if (rc)
39		return rc;
40
41	c_hdr = (struct cudbg_compress_hdr *)temp_buff.data;
42	c_hdr->compress_id = CUDBG_ZLIB_COMPRESS_ID;
43
44	memset(&compress_stream, 0, sizeof(struct z_stream_s));
45	compress_stream.workspace = pdbg_init->workspace;
46	rc = zlib_deflateInit2(&compress_stream, Z_DEFAULT_COMPRESSION,
47			       Z_DEFLATED, CUDBG_ZLIB_WIN_BITS,
48			       CUDBG_ZLIB_MEM_LVL, Z_DEFAULT_STRATEGY);
49	if (rc != Z_OK)
50		return CUDBG_SYSTEM_ERROR;
51
52	compress_stream.next_in = pin_buff->data;
53	compress_stream.avail_in = pin_buff->size;
54	compress_stream.next_out = pout_buff->data + pout_buff->offset;
55	compress_stream.avail_out = pout_buff->size - pout_buff->offset;
56
57	rc = zlib_deflate(&compress_stream, Z_FINISH);
58	if (rc != Z_STREAM_END)
59		return CUDBG_SYSTEM_ERROR;
60
61	rc = zlib_deflateEnd(&compress_stream);
62	if (rc != Z_OK)
63		return CUDBG_SYSTEM_ERROR;
64
65	c_hdr->compress_size = compress_stream.total_out;
66	c_hdr->decompress_size = pin_buff->size;
67	pout_buff->offset += compress_stream.total_out;
68
69	return 0;
70}
71