e7081eb5a3
Implement Separate metadata stream. Fix blatant wrong check in Bzip2 compressor. Implement E8E9 filter fallback in Dispack. Improve dict buffer size checks. Reduce thread count to control memory usage in archive mode.
68 lines
2 KiB
C
68 lines
2 KiB
C
/*
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* This file is a part of Pcompress, a chunked parallel multi-
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* algorithm lossless compression and decompression program.
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*
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* Copyright (C) 2012-2014 Moinak Ghosh. All rights reserved.
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* Use is subject to license terms.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program.
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* If not, see <http://www.gnu.org/licenses/>.
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*
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* moinakg@belenix.org, http://moinakg.wordpress.com/
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*
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*/
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#ifndef _META_STREAM_H
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#define _META_STREAM_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* The chunk size value which indicates a metadata chunk.
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*/
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#define METADATA_INDICATOR 1
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/*
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* Metadata chunk header format:
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* 64-bit integer = 1: Compressed length: This indicates that this is a metadata chunk
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* 64-bit integer: Compressed length (data portion only)
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* 64-bit integer: Uncompressed original length
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* 1 Byte: Chunk flag
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* Upto 64-bytes: Checksum. This is HMAC if encrypting
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* 32-bit integer: Header CRC32 if not encrypting, otherwise empty.
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*/
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#define CKSUM_MAX 64
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#define CRC32_SIZE 4
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#define METADATA_HDR_SZ (8 * 3 + 1 + CKSUM_MAX + CRC32_SIZE)
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typedef struct _meta_ctx meta_ctx_t;
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typedef struct _meta_msg {
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const uchar_t *buf;
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size_t len;
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} meta_msg_t;
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meta_ctx_t *meta_ctx_create(void *pc, int file_version, int comp_fd);
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int meta_ctx_send(meta_ctx_t *mctx, const void **buf, size_t *len);
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int meta_ctx_done(meta_ctx_t *mctx);
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void meta_ctx_close_sink_channel(meta_ctx_t *mctx);
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void meta_ctx_close_src_channel(meta_ctx_t *mctx);
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#ifdef __cplusplus
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}
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#endif
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#endif
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