71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2018 Chelsio Communications. All rights reserved.
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*/
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#include <linux/zlib.h>
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#include "cxgb4.h"
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#include "cudbg_if.h"
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#include "cudbg_lib_common.h"
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#include "cudbg_zlib.h"
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static int cudbg_get_compress_hdr(struct cudbg_buffer *pdbg_buff,
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struct cudbg_buffer *pin_buff)
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{
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if (pdbg_buff->offset + sizeof(struct cudbg_compress_hdr) >
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pdbg_buff->size)
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return CUDBG_STATUS_NO_MEM;
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pin_buff->data = (char *)pdbg_buff->data + pdbg_buff->offset;
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pin_buff->offset = 0;
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pin_buff->size = sizeof(struct cudbg_compress_hdr);
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pdbg_buff->offset += sizeof(struct cudbg_compress_hdr);
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return 0;
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}
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int cudbg_compress_buff(struct cudbg_init *pdbg_init,
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struct cudbg_buffer *pin_buff,
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struct cudbg_buffer *pout_buff)
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{
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struct cudbg_buffer temp_buff = { 0 };
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struct z_stream_s compress_stream;
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struct cudbg_compress_hdr *c_hdr;
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int rc;
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/* Write compression header to output buffer before compression */
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rc = cudbg_get_compress_hdr(pout_buff, &temp_buff);
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if (rc)
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return rc;
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c_hdr = (struct cudbg_compress_hdr *)temp_buff.data;
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c_hdr->compress_id = CUDBG_ZLIB_COMPRESS_ID;
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memset(&compress_stream, 0, sizeof(struct z_stream_s));
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compress_stream.workspace = pdbg_init->workspace;
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rc = zlib_deflateInit2(&compress_stream, Z_DEFAULT_COMPRESSION,
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Z_DEFLATED, CUDBG_ZLIB_WIN_BITS,
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CUDBG_ZLIB_MEM_LVL, Z_DEFAULT_STRATEGY);
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if (rc != Z_OK)
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return CUDBG_SYSTEM_ERROR;
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compress_stream.next_in = pin_buff->data;
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compress_stream.avail_in = pin_buff->size;
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compress_stream.next_out = pout_buff->data + pout_buff->offset;
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compress_stream.avail_out = pout_buff->size - pout_buff->offset;
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rc = zlib_deflate(&compress_stream, Z_FINISH);
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if (rc != Z_STREAM_END)
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return CUDBG_SYSTEM_ERROR;
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rc = zlib_deflateEnd(&compress_stream);
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if (rc != Z_OK)
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return CUDBG_SYSTEM_ERROR;
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c_hdr->compress_size = compress_stream.total_out;
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c_hdr->decompress_size = pin_buff->size;
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pout_buff->offset += compress_stream.total_out;
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return 0;
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}
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