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
cudbg_get_compress_hdr(struct cudbg_buffer * pdbg_buff,struct cudbg_buffer * pin_buff)13 static 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
cudbg_compress_buff(struct cudbg_init * pdbg_init,struct cudbg_buffer * pin_buff,struct cudbg_buffer * pout_buff)27 int 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