71 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*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