cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

cudbg_zlib.c (2039B)

      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}