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 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 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