1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2018 Chelsio Communications. All rights reserved.
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/zlib.h>
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include "cxgb4.h"
9*4882a593Smuzhiyun #include "cudbg_if.h"
10*4882a593Smuzhiyun #include "cudbg_lib_common.h"
11*4882a593Smuzhiyun #include "cudbg_zlib.h"
12*4882a593Smuzhiyun
cudbg_get_compress_hdr(struct cudbg_buffer * pdbg_buff,struct cudbg_buffer * pin_buff)13*4882a593Smuzhiyun static int cudbg_get_compress_hdr(struct cudbg_buffer *pdbg_buff,
14*4882a593Smuzhiyun struct cudbg_buffer *pin_buff)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun if (pdbg_buff->offset + sizeof(struct cudbg_compress_hdr) >
17*4882a593Smuzhiyun pdbg_buff->size)
18*4882a593Smuzhiyun return CUDBG_STATUS_NO_MEM;
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun pin_buff->data = (char *)pdbg_buff->data + pdbg_buff->offset;
21*4882a593Smuzhiyun pin_buff->offset = 0;
22*4882a593Smuzhiyun pin_buff->size = sizeof(struct cudbg_compress_hdr);
23*4882a593Smuzhiyun pdbg_buff->offset += sizeof(struct cudbg_compress_hdr);
24*4882a593Smuzhiyun return 0;
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun
cudbg_compress_buff(struct cudbg_init * pdbg_init,struct cudbg_buffer * pin_buff,struct cudbg_buffer * pout_buff)27*4882a593Smuzhiyun int cudbg_compress_buff(struct cudbg_init *pdbg_init,
28*4882a593Smuzhiyun struct cudbg_buffer *pin_buff,
29*4882a593Smuzhiyun struct cudbg_buffer *pout_buff)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun struct cudbg_buffer temp_buff = { 0 };
32*4882a593Smuzhiyun struct z_stream_s compress_stream;
33*4882a593Smuzhiyun struct cudbg_compress_hdr *c_hdr;
34*4882a593Smuzhiyun int rc;
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun /* Write compression header to output buffer before compression */
37*4882a593Smuzhiyun rc = cudbg_get_compress_hdr(pout_buff, &temp_buff);
38*4882a593Smuzhiyun if (rc)
39*4882a593Smuzhiyun return rc;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun c_hdr = (struct cudbg_compress_hdr *)temp_buff.data;
42*4882a593Smuzhiyun c_hdr->compress_id = CUDBG_ZLIB_COMPRESS_ID;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun memset(&compress_stream, 0, sizeof(struct z_stream_s));
45*4882a593Smuzhiyun compress_stream.workspace = pdbg_init->workspace;
46*4882a593Smuzhiyun rc = zlib_deflateInit2(&compress_stream, Z_DEFAULT_COMPRESSION,
47*4882a593Smuzhiyun Z_DEFLATED, CUDBG_ZLIB_WIN_BITS,
48*4882a593Smuzhiyun CUDBG_ZLIB_MEM_LVL, Z_DEFAULT_STRATEGY);
49*4882a593Smuzhiyun if (rc != Z_OK)
50*4882a593Smuzhiyun return CUDBG_SYSTEM_ERROR;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun compress_stream.next_in = pin_buff->data;
53*4882a593Smuzhiyun compress_stream.avail_in = pin_buff->size;
54*4882a593Smuzhiyun compress_stream.next_out = pout_buff->data + pout_buff->offset;
55*4882a593Smuzhiyun compress_stream.avail_out = pout_buff->size - pout_buff->offset;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun rc = zlib_deflate(&compress_stream, Z_FINISH);
58*4882a593Smuzhiyun if (rc != Z_STREAM_END)
59*4882a593Smuzhiyun return CUDBG_SYSTEM_ERROR;
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun rc = zlib_deflateEnd(&compress_stream);
62*4882a593Smuzhiyun if (rc != Z_OK)
63*4882a593Smuzhiyun return CUDBG_SYSTEM_ERROR;
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun c_hdr->compress_size = compress_stream.total_out;
66*4882a593Smuzhiyun c_hdr->decompress_size = pin_buff->size;
67*4882a593Smuzhiyun pout_buff->offset += compress_stream.total_out;
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun return 0;
70*4882a593Smuzhiyun }
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